JP2012227230A - Semiconductor light emitting device - Google Patents

Semiconductor light emitting device Download PDF

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JP2012227230A
JP2012227230A JP2011091375A JP2011091375A JP2012227230A JP 2012227230 A JP2012227230 A JP 2012227230A JP 2011091375 A JP2011091375 A JP 2011091375A JP 2011091375 A JP2011091375 A JP 2011091375A JP 2012227230 A JP2012227230 A JP 2012227230A
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electrode
emitting device
light emitting
power supply
circuit board
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JP5770006B2 (en
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Atsushi Shiraishi
篤 白石
Toru Sekiguchi
亨 関口
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Citizen Holdings Co Ltd
Citizen Electronics Co Ltd
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Citizen Electronics Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
    • H01L24/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L24/10—Bump connectors ; Manufacturing methods related thereto
    • H01L24/15—Structure, shape, material or disposition of the bump connectors after the connecting process
    • H01L24/17—Structure, shape, material or disposition of the bump connectors after the connecting process of a plurality of bump connectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/10—Bump connectors; Manufacturing methods related thereto
    • H01L2224/15—Structure, shape, material or disposition of the bump connectors after the connecting process
    • H01L2224/16—Structure, shape, material or disposition of the bump connectors after the connecting process of an individual bump connector
    • H01L2224/161—Disposition
    • H01L2224/16151—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
    • H01L2224/16221—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
    • H01L2224/16225—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/10—Bump connectors; Manufacturing methods related thereto
    • H01L2224/15—Structure, shape, material or disposition of the bump connectors after the connecting process
    • H01L2224/17—Structure, shape, material or disposition of the bump connectors after the connecting process of a plurality of bump connectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/4805—Shape
    • H01L2224/4809—Loop shape
    • H01L2224/48091—Arched
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/481—Disposition
    • H01L2224/48151—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
    • H01L2224/48221—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
    • H01L2224/48225—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
    • H01L2224/48227—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation connecting the wire to a bond pad of the item

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  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
  • Led Device Packages (AREA)

Abstract

PROBLEM TO BE SOLVED: To solve a problem that heat radiation is not sufficiently conducted to the rear surface side of a circuit board at a serial connection part when a substrate material having insufficient heat conductivity is used in an LED light emitting device where multiple LEDs, mounted on the circuit board by flip chip mounting method, are serially connected.SOLUTION: In an LED light emitting device 10, multiple LEDs 1a to c are mounted on a circuit board 2 by flip chip mounting method and the LEDs 1a to c are serially connected by connection electrodes 2e, 2f provided on the circuit board 2. The LED light emitting device 10 includes electrodes for heat radiation 3c, 3d on a rear surface side of the circuit board 2, and the connection electrodes 2e, 2f are connected with the electrodes for heat radiation 3c, 3d by vias 4c, 4d.

Description

本発明はＬＥＤ素子等の半導体発光素子を備えた半導体発光装置に関し、特に放熱特性の改善に関する。   The present invention relates to a semiconductor light emitting device including a semiconductor light emitting element such as an LED element, and more particularly to improvement of heat dissipation characteristics.

近年、ＬＥＤ素子（以下ＬＥＤと略記する）は半導体発光素子であるため、長寿命で優れた駆動特性を有し、さらに小型で発光効率が良く、鮮やかな発光色を有することから、カラー表示装置のバックライトや照明等に広く利用されるようになってきた。本発明においても半導体発光装置としてＬＥＤ発光装置を実施形態として説明する。   In recent years, an LED element (hereinafter abbreviated as LED) is a semiconductor light emitting element, and therefore has a long life and excellent driving characteristics, is small in size, has high luminous efficiency, and has a bright emission color. It has come to be widely used for backlights and lighting. Also in the present invention, an LED light emitting device will be described as an embodiment as a semiconductor light emitting device.

しかし、ＬＥＤ発光装置を強い発光光源とするためには、ＬＥＤ発光装置に含まれるＬＥＤの数を多くし、さらに大きい駆動電流を供給する必要がある。このとき、この大きい駆動電流に伴うＬＥＤからの発熱をＬＥＤ発光装置からいかに効率良く放熱させるかが問題となり各種の提案がなされている。（例えば特許文献１、特許文献２参照）   However, in order to make the LED light-emitting device a strong light-emitting light source, it is necessary to increase the number of LEDs included in the LED light-emitting device and supply a larger driving current. At this time, how to efficiently dissipate the heat generated from the LED accompanying this large drive current from the LED light emitting device becomes a problem, and various proposals have been made. (For example, see Patent Document 1 and Patent Document 2)

以下、従来例として特許文献１におけるＬＥＤ発光装置の構造とその放熱過程を説明する。図１０は特許文献１における従来のＬＥＤ発光装置１００の平面図、図１１は図１０のＡ−Ａ断面図であり、発明の趣旨を変えない範囲で、簡略化して記載している。図１０、図１１においてＬＥＤ発光装置１００は回路基板１０２の上面に２個の電源電極１０２ａ、１０２ｂ、２個の導体パターン１０２ｃ、１０２ｄ、接続電極１０２ｅが設けられている。また回路基板２の裏面には放熱用の金属板材１０３が設けられ、回路基板１０２の上面の２個の導体パターン１０２ｃ、１０２ｄと回路基板２の裏面の金属板材１０３とは熱伝導性の高いサーマルビア１０４によって接続されている。   Hereinafter, the structure of the LED light emitting device and the heat dissipation process in Patent Document 1 will be described as a conventional example. FIG. 10 is a plan view of a conventional LED light emitting device 100 in Patent Document 1, and FIG. 11 is a cross-sectional view taken along line AA of FIG. 10, which is simplified and described without changing the gist of the invention. 10 and 11, the LED light emitting device 100 is provided with two power supply electrodes 102a and 102b, two conductor patterns 102c and 102d, and a connection electrode 102e on the upper surface of a circuit board 102. Further, a heat radiating metal plate material 103 is provided on the back surface of the circuit board 2, and the two conductive patterns 102 c and 102 d on the upper surface of the circuit board 102 and the metal plate material 103 on the back surface of the circuit board 2 have a high thermal conductivity. They are connected by vias 104.

また、導体パターン１０２ｃ、１０２ｄの上面には２個の上面電極構成のＬＥＤ１０１ａ、１０１ｂがダイボンディングされており、ワイヤー１０５によって各電極１０２ａ，１０２ｅ，１０２ｂに接続している。すなわちＬＥＤ１０１ａのＮ電極は電源電極１０２ａ、ＬＥＤ１０１ａのＰ電極は接続電極１０２ｅにそれぞれワイヤー１０５によって接続し、ＬＥＤ１０１ｂのＮ電極は接続電極１０２ｅ、ＬＥＤ１０１ｂのＰ電極は電源電極１０２ｂにそれぞれワイヤー１０５によって接続している。以上のようにしてＬＥＤ１０１ａと１０１ｂとは接続電極１０２ｅを介して電源電極１０２ａと１０２ｂ間において直列接続している。なお１０６は透明樹脂または蛍光樹脂からなる保護樹脂層である。   Further, two upper surface electrode LEDs 101a and 101b are die-bonded on the upper surfaces of the conductor patterns 102c and 102d, and are connected to the electrodes 102a, 102e, and 102b by wires 105. That is, the N electrode of the LED 101a is connected to the power electrode 102a, the P electrode of the LED 101a is connected to the connection electrode 102e via the wire 105, the N electrode of the LED 101b is connected to the connection electrode 102e, and the P electrode of the LED 101b is connected to the power electrode 102b via the wire 105. ing. As described above, the LEDs 101a and 101b are connected in series between the power supply electrodes 102a and 102b via the connection electrode 102e. Reference numeral 106 denotes a protective resin layer made of transparent resin or fluorescent resin.

次に上記ＬＥＤ発光装置１００の放熱過程を説明する。図１０における電源電極１０２ａと１０２ｂに図示しない電源装置から電流を供給すると、直列接続されたＬＥＤ１０１ａ、１０１ｂには電源電極１０２ｂから、接続電極１０２ｅを経由して電源電極１０２ａに電流が流れ、ＬＥＤ１０１ａ、１０１ｂは発光と同時に発熱する。しかしこの熱は、ＬＥＤ１０１ａ、１０１ｂが導体パターン１０２ｃ、１０２ｄに密着しているため、直接的に導体パターン１０２ｃ、１０２ｄ及びサーマルビア１０４を介して回路基板２の裏面の金属板材１０３に伝わり、金属板材１０３によりＬＥＤ発光装置１００を実装するマザー基板（図示せず）側に強力に放出する。   Next, a heat dissipation process of the LED light emitting device 100 will be described. When a current is supplied from a power supply device (not shown) to the power supply electrodes 102a and 102b in FIG. 10, the current flows from the power supply electrode 102b to the power supply electrode 102a via the connection electrode 102e to the LEDs 101a and 101b connected in series. 101b generates heat simultaneously with light emission. However, since the LEDs 101a and 101b are in close contact with the conductor patterns 102c and 102d, this heat is directly transmitted to the metal plate material 103 on the back surface of the circuit board 2 through the conductor patterns 102c and 102d and the thermal via 104. 103, the LED light emitting device 100 is strongly emitted to the mother board (not shown) side.

次に他の従来例として特許文献２におけるＬＥＤ発光装置の構造とその放熱過程を説明する。図１２は特許文献２における従来のＬＥＤ発光装置２００の要部断面図であり、発明の趣旨を変えない範囲で簡略化して記載している。図１２においてＬＥＤ発光装置２００は、回路基板２０２の上面に２個の電源電極２０２ａ、２０２ｂと２個の接続電極２０２ｅ、２０２ｆを備え、回路基板２の裏面に電源電極２０２ａ、２０２ｂと対応する位置に２個の電源端子電極２０３ａ、２０３ｂが設けられている。このとき回路基板２０２の上面の電源電極２０２ａ、２０２ｂと回路基板２０２の裏面の電源端子電極２０３ａ、２０３ｂとは熱伝導性の高いサーマルビア２０４ａ、２０４ｂによって電気的及び熱的に接続されている。   Next, the structure and heat dissipation process of the LED light emitting device in Patent Document 2 will be described as another conventional example. FIG. 12 is a cross-sectional view of a main part of a conventional LED light emitting device 200 in Patent Document 2, which is simplified and described without changing the gist of the invention. In FIG. 12, the LED light emitting device 200 includes two power supply electrodes 202a and 202b and two connection electrodes 202e and 202f on the upper surface of the circuit board 202, and a position corresponding to the power supply electrodes 202a and 202b on the back surface of the circuit board 2. Two power supply terminal electrodes 203a and 203b are provided. At this time, the power supply electrodes 202a and 202b on the upper surface of the circuit board 202 and the power supply terminal electrodes 203a and 203b on the back surface of the circuit board 202 are electrically and thermally connected by thermal vias 204a and 204b having high thermal conductivity.

また回路基板２０２の上面側ではＬＥＤ２０１ａがフリップチップ実装され、そのＮ電極が電源電極２０２ａに、Ｐ電極が接続電極２０２ｅに接続している。同様にＬＥＤ２０１ｂのＮ電極が接続電極２０２ｅに、Ｐ電極が接続電極２０２ｆに接続し、さらにＬＥＤ２０１ｃのＮ電極が接続電極２０２ｆに、Ｐ電極が電源電極２０２ｂに接続している。すなわち３個のＬＥＤ２０１ａ、２０１ｂ、２０１ｃは、電源端子電極２０３ａ、２０３ｂの間において電源電極２０２ａ、接続電極２０２ｅ、２０２ｆ、電源電極２０２ｂを介して直列接続している。   On the upper surface side of the circuit board 202, the LED 201a is flip-chip mounted, and its N electrode is connected to the power supply electrode 202a and the P electrode is connected to the connection electrode 202e. Similarly, the N electrode of the LED 201b is connected to the connection electrode 202e, the P electrode is connected to the connection electrode 202f, the N electrode of the LED 201c is connected to the connection electrode 202f, and the P electrode is connected to the power supply electrode 202b. That is, the three LEDs 201a, 201b, and 201c are connected in series between the power supply terminal electrodes 203a and 203b via the power supply electrode 202a, the connection electrodes 202e and 202f, and the power supply electrode 202b.

次に上記ＬＥＤ発光装置２００の放熱過程を説明する。図１２における電源端子電極２０３ａと２０３ｂに図示しない電源装置から電流を供給すると、直列接続したＬＥＤ２０１ａ、２０１ｂ、２０１ｃには電源電極２０２ｂから接続電極２０２ｆ、２０２ｅを経由して電源電極１０２ａに電流が流れ、ＬＥＤ２０１ａ、２０１ｂ、２０１ｃは発光と同時に発熱する。ＬＥＤ２０１ｃの発する熱は、発熱量の多いＰ電極（より正確にはＰ電極と接する半導体層）からサーマルビア２０４ｂを通して回路基板２０２の裏面に設けられた電源端子電極２０３ｂに伝わり、ＬＥＤ発光装置２００を実装するマザー基板（図失せず）に高い効率で放出する。これに対しＬＥＤ素子２０１ａ、２０１ｂが発する熱は、発熱量の多いＰ電極から接続電極２０２ｅ、２０２ｆを介し回路基板２０２を通じてマザー基板に放出する。またＬＥＤ２０１ａのＮ電極側は、発熱量が少ないのでサーマルビア２０４ａを通して回路基板２０２の裏面に設けられた電源端子電極２０３ａに伝わるとしても放熱としては効果が小さい。   Next, a heat dissipation process of the LED light emitting device 200 will be described. When current is supplied from a power supply device (not shown) to the power supply terminal electrodes 203a and 203b in FIG. 12, the current flows from the power supply electrode 202b to the power supply electrode 102a via the connection electrodes 202f and 202e in the LEDs 201a, 201b, and 201c connected in series. The LEDs 201a, 201b, and 201c generate heat simultaneously with light emission. The heat generated by the LED 201c is transmitted from the P electrode having a large amount of heat generation (more precisely, a semiconductor layer in contact with the P electrode) to the power supply terminal electrode 203b provided on the back surface of the circuit board 202 through the thermal via 204b. Highly efficient discharge to the mother board (not shown). On the other hand, the heat generated by the LED elements 201a and 201b is released from the P electrode having a large calorific value through the connection electrodes 202e and 202f to the mother board through the circuit board 202. Further, since the N electrode side of the LED 201a has a small amount of heat generation, even if it is transmitted to the power terminal electrode 203a provided on the back surface of the circuit board 202 through the thermal via 204a, the effect of heat dissipation is small.

特開２００７−２５０８９９号公報JP 2007-250899 A 特開２００７―１０３９１７号公報JP 2007-103917 A

上記特許文献１に示すＬＥＤ発光装置１００は、ＬＥＤ１０１ａ，ｂの底面全体を導体パターン１０２ｃ，１０２ｄに密着させ、サーマルビア１０４を介して回路基板１０２の裏面側に設けた金属板材１０３からマザー基板に強力に放熱することができる。しかしながらサファイア基板等の絶縁基板上に半導体層を積層した構造をとるＬＥＤ１０１ａ，ｂは、絶縁基板の熱伝導性が低いことから半導体層が発生する熱を効率良く導体パターン１０２ｃ，１０２ｄに伝えることができない。   In the LED light emitting device 100 shown in Patent Document 1, the entire bottom surfaces of the LEDs 101a and 101b are brought into close contact with the conductor patterns 102c and 102d, and the metal plate material 103 provided on the back side of the circuit board 102 through the thermal via 104 is changed to the mother substrate. It can dissipate heat strongly. However, the LEDs 101a and 101b having a structure in which a semiconductor layer is stacked on an insulating substrate such as a sapphire substrate can efficiently transmit the heat generated by the semiconductor layer to the conductor patterns 102c and 102d because the thermal conductivity of the insulating substrate is low. Can not.

これに対し半導体層が突起電極などの接続部材を介して直接的に回路基板上の電極と接続するフリップチップ実装方式は、半導体層の発する熱を効率よく回路基板に伝えられることが知られている。ところが特許文献２に示すＬＥＤ発光装置２００のＬＥＤ２０１ａ、２０１ｂは発熱量の多いＰ電極（より正確にはＰ電極と接続する半導体層）が接続電極２０２ｅ、２０２ｆ、回路基板２０２を介して放熱することから、回路基板２０２は熱伝導性の高い金属やセラミクスを選ばざるを得ず、基板材料として樹脂等の熱伝導率の低い材料が使えないという課題がある。   On the other hand, the flip chip mounting method in which the semiconductor layer is directly connected to the electrode on the circuit board via a connecting member such as a protruding electrode is known to efficiently transfer the heat generated by the semiconductor layer to the circuit board. Yes. However, the LEDs 201a and 201b of the LED light emitting device 200 shown in Patent Document 2 have a P electrode (more precisely, a semiconductor layer connected to the P electrode) that generates a large amount of heat radiates through the connection electrodes 202e and 202f and the circuit board 202. Therefore, the circuit board 202 has to select a metal or ceramic having high thermal conductivity, and there is a problem that a material having low thermal conductivity such as a resin cannot be used as a board material.

そこで本発明の目的は、上記問題点を解決しようとするものであり、回路基板上でフリップチップ実装したＬＥＤを直列接続しても各ＬＥＤの放熱特性が良好であるため強力な発光が得られながら、回路基板用の材料に対する選択範囲が広いＬＥＤ発光装置を提供することである。   Therefore, an object of the present invention is to solve the above-mentioned problems, and even if LEDs flip-chip mounted on a circuit board are connected in series, the heat radiation characteristics of each LED are good, so that strong light emission can be obtained. However, it is an object to provide an LED light-emitting device having a wide selection range for materials for circuit boards.

上記目的を達成するための本発明におけるＬＥＤ発光装置は、回路基板上に複数の半導体発光素子をフリップチップ実装し、該複数の半導体発光素子を回路基板上に設けた接続電極により直列接続する半導体発光装置において、前記回路基板の裏面側に放熱用電極を備え、前記接続電極と前記放熱用電極とが導電性を有するビアで接続することを特徴とする。   In order to achieve the above object, an LED light-emitting device according to the present invention is a semiconductor in which a plurality of semiconductor light-emitting elements are flip-chip mounted on a circuit board, and the plurality of semiconductor light-emitting elements are connected in series by connection electrodes provided on the circuit board. In the light emitting device, a heat radiation electrode is provided on the back side of the circuit board, and the connection electrode and the heat radiation electrode are connected by a conductive via.

上記構成によれば、直列接続用の接続電極に接続するＰ電極から伝わってくる熱が、電気伝導性を有するため熱伝導性も高くなっているビアを介して回路基板裏面の放熱用電極に達する。放熱用電極はマザー基板に準備しておく放熱用ダミー電極と接続するものであり、放熱用電極に達した熱は放熱用ダミー電極を通じてマザー基板に放出される。なおこの放熱用ダミー電極は電気的にはフローティングである。   According to the above configuration, the heat transmitted from the P electrode connected to the connection electrode for series connection has electrical conductivity, and thus the heat conductivity is increased to the heat radiation electrode on the back surface of the circuit board through the via. Reach. The heat radiating electrode is connected to a heat radiating dummy electrode prepared on the mother substrate, and the heat reaching the heat radiating electrode is released to the mother substrate through the heat radiating dummy electrode. The heat radiation dummy electrode is electrically floating.

複数の前記半導体発光素子は並列接続した半導体発光素子群を含み、複数の半導体発光素子群同士又は前記半導体発光素子と他の前記半導体発光素子群とが前記接続電極により直列接続していても良い。   The plurality of semiconductor light emitting elements include semiconductor light emitting element groups connected in parallel, and the plurality of semiconductor light emitting element groups or the semiconductor light emitting elements and the other semiconductor light emitting element groups may be connected in series by the connection electrodes. .

前記ビアは１つの接続電極に複数個設けられていると良い。   A plurality of the vias may be provided in one connection electrode.

前記回路基板は、その上面に電源電極、裏面に電力を供給する電源端子電極を備え、前記電源電極と前記電源端子電極とが前記ビアにより接続していると良い。   The circuit board may include a power supply electrode on the upper surface and a power supply terminal electrode for supplying power to the rear surface, and the power supply electrode and the power supply terminal electrode may be connected by the via.

上記の如く、本発明のＬＥＤ発光装置は、直列接続用の接続電極に接続するＰ電極から伝わってくる熱が、電気伝導性を有するため熱伝導性も高くなっているビアを介して回路基板裏面の放熱用電極に容易に達し、効率よくマザー基板に放出する。すなわち本発明のＬＥＤ発光装置は各ＬＥＤを直列接続させる接続電極に電気的伝導性のあるビア及び放熱用電極を設けることによって放熱特性を改善し強力発光が得られるようにできるとともに、主たる熱伝導経路をビアとしたため回路基板の材料として熱伝導率の低いものが使えるようになるため材料選択幅が広がる。   As described above, the LED light-emitting device of the present invention has a circuit board through vias in which the heat transmitted from the P electrode connected to the connection electrode for series connection has electrical conductivity and thus has high thermal conductivity. Easily reaches the heat dissipation electrode on the back surface and efficiently discharges it to the mother board. That is, the LED light-emitting device of the present invention can improve the heat dissipation characteristics and provide strong light emission by providing electrically conductive vias and heat-dissipating electrodes on the connection electrodes for connecting the LEDs in series, and the main heat conduction. Since the route is a via, a material having a low thermal conductivity can be used as a material for the circuit board, so the material selection range is widened.

本発明の第１実施形態におけるＬＥＤ発光装置の樹脂封止前の上面側の平面図である。It is a top view of the upper surface side before resin sealing of the LED light-emitting device in 1st Embodiment of this invention. 図１に示す回路基板の裏面図である。It is a reverse view of the circuit board shown in FIG. 図１に示す平面図に樹脂封止を行った完成ＬＥＤ発光装置のＡ−Ａ断面図である。It is AA sectional drawing of the completion LED light-emitting device which performed resin sealing on the top view shown in FIG. 図３に示すＬＥＤ発光装置をマザー基板に実装した断面図である。It is sectional drawing which mounted the LED light-emitting device shown in FIG. 3 on the mother board | substrate. 本発明の第２実施形態におけるＬＥＤ発光装置の樹脂封止前の上面側の平面図である。It is a top view of the upper surface side before resin sealing of the LED light-emitting device in 2nd Embodiment of this invention. 図５に示す回路基板の裏面側の平面図である。It is a top view of the back surface side of the circuit board shown in FIG. 本発明の第３実施形態におけるＬＥＤ発光装置の樹脂封止前の上面側の平面図である。It is a top view of the upper surface side before resin sealing of the LED light-emitting device in 3rd Embodiment of this invention. 図７に示す回路基板の裏面図である。It is a reverse view of the circuit board shown in FIG. 図７に示す平面図に樹脂封止を行った完成ＬＥＤ発光装置のＡ−Ａ断面図である。It is AA sectional drawing of the completion LED light-emitting device which performed resin sealing on the top view shown in FIG. 特許文献１に示す従来のＬＥＤ発光装置の平面図である。It is a top view of the conventional LED light-emitting device shown in patent document 1. 図１０に示す従来のＬＥＤ発光装置のＡ−Ａ断面図である。It is AA sectional drawing of the conventional LED light-emitting device shown in FIG. 特許文献２に示す従来のＬＥＤ発光装置の断面図である。It is sectional drawing of the conventional LED light-emitting device shown in patent document 2. FIG.

以下図面により、本発明の実施形態を説明する。図１は本発明の第１実施形態におけるＬＥＤ発光装置の樹脂封止前の平面図、図２は図１に示す回路基板の裏面図、図３は図１に示す平面図に樹脂封止を行った完成ＬＥＤ発光装置のＡ−Ａ断面図、図４は図３に示すＬＥＤ発光装置をマザー基板に実装した断面図であり、基本的構成は図１２に示すＬＥＤ発光装置２００と同じであり、ＬＥＤ発光装置２００と同一部材には同一名称を付している。   Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of an LED light-emitting device according to a first embodiment of the present invention before resin sealing, FIG. 2 is a back view of the circuit board shown in FIG. 1, and FIG. 3 is a plan view of FIG. FIG. 4 is a cross-sectional view of the completed LED light-emitting device taken along the line AA, FIG. 4 is a cross-sectional view of the LED light-emitting device shown in FIG. The same names are given to the same members as those of the LED light emitting device 200.

（第１実施形態におけるＬＥＤ発光装置の説明）
以下図１〜４で本発明の第１実施形態におけるＬＥＤ発光装置の構成及びマザー基板への実装状況を説明する。図１示すようにＬＥＤ発光装置１０に含まれる回路基板２の上面側には、２個の電源電極２ａ、２ｂ、２個の接続電極２ｅ、２ｆ、ビア４ａ〜ｄ、３個のＬＥＤ１ａ、１ｂ、１ｃがある。ビア４ａ〜ｄはそれぞれ電源電極２ａ、２ｂ、接続電極２ｅ，２ｆが占める領域内で且つＬＥＤ１ａ〜ｃとは重ならない領域にある。ＬＥＤ１ａ〜ｃは回路基板２に対しフリップチップ実装されている。ＬＥＤ１ａ〜ｃのＰ電極は、それぞれ電源電極２ａ、接続電極２ｅ，２ｆと接続している。これに対しＬＥＤ１ａ〜ｃのＮ電極は、それぞれ接続電極２ｅ，２ｆ、電源電極２ｂと接続している。 (Description of LED light emitting device in the first embodiment)
1-4, the structure of the LED light-emitting device in 1st Embodiment of this invention and the mounting condition to a motherboard are demonstrated. As shown in FIG. 1, two power supply electrodes 2a, 2b, two connection electrodes 2e, 2f, vias 4a-d, and three LEDs 1a, 1b are provided on the upper surface side of the circuit board 2 included in the LED light emitting device 10. 1c. The vias 4a to 4d are in areas occupied by the power supply electrodes 2a and 2b and the connection electrodes 2e and 2f, respectively, and are not overlapped with the LEDs 1a to c. The LEDs 1a to 1c are flip-chip mounted on the circuit board 2. The P electrodes of the LEDs 1a to 1c are connected to the power supply electrode 2a and the connection electrodes 2e and 2f, respectively. On the other hand, the N electrodes of the LEDs 1a to c are connected to the connection electrodes 2e and 2f and the power supply electrode 2b, respectively.

各ＬＥＤ１ａ〜ｃの平面形状は矩形であり、この矩形のひとつの角部にＮ電極が存在し、そのＮ電を囲むように大きなＬ字形状のＰ電極が設けられている。電源電極２ａは、ＬＥＤ１ａのＰ電極を取り囲むようにして広い面積を占めながら、ＬＥＤ１ａのＮ電極と絶縁させるため切り欠いた部分がある。接続電極２ｅは、ＬＥＤ１ｂのＰ電極を取り囲むようにして広い面積を占めながら、ＬＥＤ１ｂのＮ電極と絶縁させるため切り欠いた部分があるのに加え、ＬＥＤ１ａのＮ電極と接続するための凸部がある。接続電極２ｆは接続電極２ｅと同じ形状である。電源電極２ｂは長方形の領域にＬＥＤ１ｃのＮ電極と接続するための凸部がある。なおビア４ａ，４ｃ，４ｄは複数個である一方、ビア４ｂは単個である。   Each of the LEDs 1a to 1c has a rectangular planar shape, and an N electrode is present at one corner of the rectangle, and a large L-shaped P electrode is provided so as to surround the N electricity. The power supply electrode 2a occupies a wide area so as to surround the P electrode of the LED 1a, but has a notch portion for insulation from the N electrode of the LED 1a. The connection electrode 2e occupies a large area so as to surround the P electrode of the LED 1b, and in addition to having a cutout portion for insulation from the N electrode of the LED 1b, there is a protrusion for connecting to the N electrode of the LED 1a. is there. The connection electrode 2f has the same shape as the connection electrode 2e. The power supply electrode 2b has a convex portion for connecting to the N electrode of the LED 1c in a rectangular region. There are a plurality of vias 4a, 4c, 4d, while there is a single via 4b.

大きな面積をもつＬＥＤ１ａ〜ｃのＰ電極はメッキ法によって形成されるため、平面形状を任意に設計できる。そこでＰ電極は、放熱特性を向上させるため発光層とほぼ重なり合うようしたうえでＮ電極周辺部を避けるようにした。これに呼応してＰ電極と接続する電源電極２ａと２個の接続電極２ｅ、２ｆは放熱特性を向上させるために大きな面積を有している。さらに電源電極２ａ、接続電極２ｅ、２ｆは回路基板２の裏面側に放熱するためのビア４ａ、４ｃ、４ｄを複数個有している。なおビア４ａ〜ｄは電気伝導性があるので熱伝導性も良いが、さらに熱伝導性を向上させるためにはビア中に銅等の金属ペーストを充填すると良い。   Since the P electrodes of the LEDs 1a to 1c having a large area are formed by a plating method, the planar shape can be arbitrarily designed. Therefore, in order to improve the heat dissipation characteristics, the P electrode is overlapped with the light emitting layer, and the periphery of the N electrode is avoided. In response to this, the power supply electrode 2a and the two connection electrodes 2e, 2f connected to the P electrode have a large area in order to improve the heat dissipation characteristics. Furthermore, the power supply electrode 2a and the connection electrodes 2e and 2f have a plurality of vias 4a, 4c and 4d for radiating heat to the back side of the circuit board 2. The vias 4a to 4d have good electrical conductivity because they have electrical conductivity. However, in order to further improve thermal conductivity, the vias may be filled with a metal paste such as copper.

図２は図１に示す回路基板２の裏面図であり、回路基板２の上面側の２個の電源電極２ａ、２ｂに対応する位置に電源端子電極３ａ、３ｂ、２個の接続電極２ｅ、２ｆに対応する位置に放熱用電極３ｃ、３ｄがある。各々の電極３ａ〜ｄは大きな面積であるが、マザー基板の実装性以外に、電源端子電極３ａ、放熱用電極３ｃ、３ｄは放熱性にも配慮している。電源電極２ａと電源端子電極３ａ、電源電極２ｂと電源端子電極３ｂ、接続電極２ｅと放熱用電極３ｃ、接続電極２ｆと放熱用電極３ｄはそれぞれビア４ａ、４ｂ、４ｃ、４ｄによって接続している。なお参考のためＬＥＤ１ａ〜ｃを点線で示した。   FIG. 2 is a rear view of the circuit board 2 shown in FIG. 1, and power terminal electrodes 3a, 3b, two connection electrodes 2e, at positions corresponding to the two power electrodes 2a, 2b on the upper surface side of the circuit board 2. There are the radiation electrodes 3c and 3d at positions corresponding to 2f. Each of the electrodes 3a to 3d has a large area, but in addition to the mountability of the mother board, the power supply terminal electrode 3a and the heat radiation electrodes 3c and 3d also take heat dissipation into consideration. The power supply electrode 2a and the power supply terminal electrode 3a, the power supply electrode 2b and the power supply terminal electrode 3b, the connection electrode 2e and the heat radiation electrode 3c, and the connection electrode 2f and the heat radiation electrode 3d are connected by vias 4a, 4b, 4c and 4d, respectively. . In addition, LED1a-c was shown with the dotted line for reference.

図３は図１のＡ−Ａ断面図である。先ず回路基板２から説明する。図１、図２で説明した如くＬＥＤ発光装置１０の回路基板２の上面側には２個の電源電極２ａ、２ｂと２個の接続電極２ｅ、２ｆがあり、裏面側には電源電極２ａ、２ｂに対応する位置に電源端子電極３ａ、３ｂ、２個の接続電極２ｅ、２ｆに対応する位置に放熱用電極３ｃ、３ｄがある。電源電極２ａと電源端子電極３ａ、電源電極２ｂと電源端子電極３ｂ、接続電極２ｅと放熱用電極３ｃ、接続電極２ｆと放熱用電極３ｄはビア４ａ、４ｂ、４ｃ、４ｄによって接続している。   3 is a cross-sectional view taken along the line AA in FIG. First, the circuit board 2 will be described. As described with reference to FIGS. 1 and 2, there are two power supply electrodes 2a and 2b and two connection electrodes 2e and 2f on the upper surface side of the circuit board 2 of the LED light emitting device 10, and the power supply electrodes 2a and 2f on the rear surface side. The power supply terminal electrodes 3a and 3b are located at positions corresponding to 2b, and the heat radiation electrodes 3c and 3d are located at positions corresponding to the two connection electrodes 2e and 2f. The power supply electrode 2a and the power supply terminal electrode 3a, the power supply electrode 2b and the power supply terminal electrode 3b, the connection electrode 2e and the heat radiation electrode 3c, and the connection electrode 2f and the heat radiation electrode 3d are connected by vias 4a, 4b, 4c and 4d.

次にＬＥＤ１ａ〜ｃに係わる事項を説明する。回路基板２の上面側においてＬＥＤ１ａは、Ｐ電極が電源電極２ａに、Ｎ電極が接続電極２ｅに接続するようにしてフリップチップ実装されている。同様にＬＥＤ１ｂは、Ｐ電極が接続電極２ｅに、Ｎ電極が接続電極２ｆに接続するようフリップチップ実装され、さらにＬＥＤ１ｃは、Ｐ電極が接続電極２ｆに、Ｎ電極が電源電極２ｂに接続するようフリップチップ実装されている。なお封止樹脂６は透明樹脂または蛍光樹脂からなる保護樹脂層である。以上のように３個のＬＥＤ１ａ、１ｂ、１ｃは電源端子電極３ａ、電源電極２ａ、接続電極２ｅ、２ｆ、電源電極２ｂ、電源端子電極３ｂを通じて直列接続する。   Next, the matter regarding LED1a-c is demonstrated. On the upper surface side of the circuit board 2, the LED 1a is flip-chip mounted so that the P electrode is connected to the power supply electrode 2a and the N electrode is connected to the connection electrode 2e. Similarly, the LED 1b is flip-chip mounted so that the P electrode is connected to the connection electrode 2e and the N electrode is connected to the connection electrode 2f, and the LED 1c is further connected to the connection electrode 2f and the N electrode is connected to the power electrode 2b. Flip chip mounting. The sealing resin 6 is a protective resin layer made of a transparent resin or a fluorescent resin. As described above, the three LEDs 1a, 1b, and 1c are connected in series through the power supply terminal electrode 3a, the power supply electrode 2a, the connection electrodes 2e and 2f, the power supply electrode 2b, and the power supply terminal electrode 3b.

次に図１から図３により上記ＬＥＤ発光装置１０の動作を説明する。基本的な動作は図１２に示すＬＥＤ発光装置２００と同じである。電源端子電極３ａから電源端子電極３ｂに向かって図示しない電源装置から電流を供給すると、直列接続されたＬＥＤ１ａ、１ｂ、１ｃは電源電極２ａ、接続電極２ｅ、２ｆ、電源電極２ｂを通して電流が流れ発光と同時に発熱する。   Next, the operation of the LED light emitting device 10 will be described with reference to FIGS. The basic operation is the same as that of the LED light emitting device 200 shown in FIG. When a current is supplied from a power supply device (not shown) from the power supply terminal electrode 3a toward the power supply terminal electrode 3b, the LEDs 1a, 1b, 1c connected in series flow through the power supply electrode 2a, the connection electrodes 2e, 2f, and the power supply electrode 2b to emit light. At the same time it generates heat.

次にＬＥＤ発光装置１０と図１２に示す従来のＬＥＤ発光装置２００との違いを説明する。図１２に対し図３は、ＬＥＤ発光装置１０において回路基板２の上面側に設けた接続電極２ｅ、２ｆに対応するように回路基板２の裏面側に放熱用電極３ｃ、３ｄを設けたことと、接続電極２ｅと放熱用電極３ｃ並びに接続電極２ｆと放熱用電極３ｄとをそれぞれビア４ｃ、４ｄによって接続していることが相違している。この場合、放熱用電極３ｃ、３ｄは電源電極２ａ、２ｂや電源端子電極３ａ、３ｂとは電気的に絶縁されている必要がある。   Next, the difference between the LED light emitting device 10 and the conventional LED light emitting device 200 shown in FIG. 12 will be described. FIG. 3 is different from FIG. 12 in that the radiation electrodes 3c and 3d are provided on the back surface side of the circuit board 2 so as to correspond to the connection electrodes 2e and 2f provided on the upper surface side of the circuit board 2 in the LED light emitting device 10. The connection electrode 2e and the heat radiation electrode 3c and the connection electrode 2f and the heat radiation electrode 3d are connected by vias 4c and 4d, respectively. In this case, the heat radiation electrodes 3c and 3d need to be electrically insulated from the power supply electrodes 2a and 2b and the power supply terminal electrodes 3a and 3b.

次に上記構成におけるＬＥＤ発光装置１０の放熱に係わる動作を説明する。
ＬＥＤ１ａはＰ電極側から流出する熱を電源電極２ａ、ビア４ａ、電源端子電極３ａを通して回路基板２の裏面側の電源端子電極３ａに伝え、マザー基板（図４参照）側に放出する。Ｎ電極側から流出する熱はもともと小さいが、接続電極２ｅ、ビア４ｃ、放熱用電極３ｃを通して回路基板２の裏面から放出する。同様にＬＥＤ１ｂはＰ電極側から流出する熱を接続電極２ｅ、ビア４ｃ、放熱用電極３ｃを通して回路基板２の裏面側の放熱用電極３ｃに伝え、マザー基板側に放出する。ＬＥＤ１ｂのＮ電極側から流出する熱は、接続電極２ｆ、ビア４ｄ、放熱用電極３ｄを通してマザー基板に放熱する。さらにＬＥＤ１ｃは、Ｐ電極側から流出する熱を接続電極２ｆ、ビア４ｄ、放熱用電極３ｄを通してマザー基板側に放出する。Ｎ電極側から流出する熱は、電源電極２ｂ、ビア４ｂ、電源端子電極３ｂを通してマザー基板側に放熱する。すなわち、フリップチップ実装したＬＥＤ１ａ、１ｂ、１ｃは、Ｐ電極からビア４ａ，４ｃ，４ｄを経て回路基板２の裏面側の電極３ａ、３ｃ、３ｄに至るまで低い熱抵抗で接続しているため、マザー基板に効率的に放熱できる。 Next, an operation related to heat dissipation of the LED light emitting device 10 having the above configuration will be described.
The LED 1a transmits heat flowing out from the P electrode side to the power terminal electrode 3a on the back surface side of the circuit board 2 through the power electrode 2a, the via 4a, and the power terminal electrode 3a, and releases it to the mother substrate (see FIG. 4) side. Although the heat flowing out from the N electrode side is originally small, it is released from the back surface of the circuit board 2 through the connection electrode 2e, the via 4c, and the heat radiation electrode 3c. Similarly, the LED 1b transmits heat flowing out from the P electrode side to the heat radiation electrode 3c on the back surface side of the circuit board 2 through the connection electrode 2e, the via 4c, and the heat radiation electrode 3c, and releases it to the mother substrate side. The heat flowing out from the N electrode side of the LED 1b is radiated to the mother substrate through the connection electrode 2f, the via 4d, and the heat radiation electrode 3d. Further, the LED 1c releases the heat flowing out from the P electrode side to the mother substrate side through the connection electrode 2f, the via 4d, and the heat radiation electrode 3d. The heat flowing out from the N electrode side is radiated to the mother substrate side through the power supply electrode 2b, the via 4b, and the power supply terminal electrode 3b. That is, the flip-chip mounted LEDs 1a, 1b, 1c are connected with low thermal resistance from the P electrode through the vias 4a, 4c, 4d to the electrodes 3a, 3c, 3d on the back side of the circuit board 2. Heat can be efficiently radiated to the mother board.

図４においてＬＥＤ発光装置１０をマザー基板４０に実装した状況を説明する。図４は図３に示すＬＥＤ発光装置１０をマザー基板４０に実装した状態の断面図である。マザー基板４０の上面には電源供給電極４０ａ（＋電極），４０ｂ（−電極）と放熱用ダミー電極４０ｃ、４０ｄが設けられている。ＬＥＤ発光装置１０の電源端子電極３ａ、３ｂはマザー基板４０の電源供給電極４０ａ、４０ｂに、ＬＥＤ発光装置１０の放熱用電極３ｃ、３ｄはマザー基板４０の放熱用ダミー電極４０ｃ、４０ｄに接続している。ＬＥＤ発光装置１０の動作時には、電源供給電極４０ａからＬＥＤ発光装置１０に電流が流れ込み、ＬＥＤ発光装置１０から電源供給電極４０ｂに電流が流れ出す。放熱用ダミー電極４０ｃ、４０ｄは電気的にはフローティングであり熱伝導のみに寄与する。   The situation where the LED light emitting device 10 is mounted on the mother board 40 in FIG. 4 will be described. 4 is a cross-sectional view of the LED light emitting device 10 shown in FIG. On the upper surface of the mother substrate 40, power supply electrodes 40a (+ electrodes) and 40b (−electrodes) and heat radiation dummy electrodes 40c and 40d are provided. The power terminal electrodes 3a and 3b of the LED light emitting device 10 are connected to the power supply electrodes 40a and 40b of the mother substrate 40, and the heat radiation electrodes 3c and 3d of the LED light emitting device 10 are connected to the heat radiation dummy electrodes 40c and 40d of the mother substrate 40. ing. During operation of the LED light emitting device 10, current flows from the power supply electrode 40a to the LED light emitting device 10, and current flows from the LED light emitting device 10 to the power supply electrode 40b. The heat radiation dummy electrodes 40c, 40d are electrically floating and contribute only to heat conduction.

次にＬＥＤ発光素子１０とマザー基板４０との間の放熱過程を説明する。ＬＥＤ発光装置１０の電源端子電極３ａに達した熱は電源供給電極４０ａを介してマザー基板４０に伝えられる。放熱用電極３ｃ、３ｄに達した熱も同様に放熱用ダミー電極４０ｃ、４０ｄを通じてマザー基板４０に伝わる。放熱効果は小さいが電源端子電極３ｂに達した熱も電源供給電極４０ｂを通じてマザー基板４０に伝達される。マザー基板４０は大型であるため熱容量が大きく、ヒートシンクとして機能し、ときには放熱部材を備えることもある。また放熱効率を上げるためには、電源供給電極４０ａ、４０ｂや放熱用ダミー電極４０ｃ、４０ｄの面積を大きくすることが好ましい。   Next, a heat dissipation process between the LED light emitting element 10 and the mother substrate 40 will be described. The heat reaching the power terminal electrode 3a of the LED light emitting device 10 is transferred to the mother board 40 via the power supply electrode 40a. Similarly, the heat reaching the heat radiation electrodes 3c and 3d is also transmitted to the mother substrate 40 through the heat radiation dummy electrodes 40c and 40d. Although the heat dissipation effect is small, the heat reaching the power terminal electrode 3b is also transmitted to the mother board 40 through the power supply electrode 40b. Since the mother board 40 is large, it has a large heat capacity, functions as a heat sink, and sometimes includes a heat dissipation member. In order to increase the heat radiation efficiency, it is preferable to increase the areas of the power supply electrodes 40a and 40b and the heat radiation dummy electrodes 40c and 40d.

（第２実施形態におけるＬＥＤ発光装置の説明）
第１実施形態ではＬＥＤ発光装置１０に含まれる複数のＬＥＤ１ａ〜ｃが単純に直列接続していた。しかしながら本発明のＬＥＤ素子は、複数のＬＥＤの一部が並列接続したＬＥＤ群を構成し、このＬＥＤ群同士又は一個のＬＥＤと他のＬＥＤ群とが接続電極により直列接続してもよい。そこでこの場合に対応するＬＥＤ発光装置として、図５、図６により本発明の第２実施形態を説明する。図５はＬＥＤ発光装置２０を構成する回路基板２２の上面側の平面図、図６は回路基板２２の裏面図であり、図1に示すＬＥＤ発光装置１０と基本的構成は同じなので同一部材には同一名称を付し重複する説明は省略する。なお図５は水平方向の中心線（図示せず）について対称になっており、図の上側が図１にほぼ等しい。 (Description of LED Light Emitting Device in Second Embodiment)
In the first embodiment, the plurality of LEDs 1a to 1c included in the LED light emitting device 10 are simply connected in series. However, the LED element of the present invention may constitute an LED group in which some of a plurality of LEDs are connected in parallel, and the LED groups or one LED and another LED group may be connected in series by a connection electrode. Therefore, a second embodiment of the present invention will be described with reference to FIGS. 5 and 6 as an LED light emitting device corresponding to this case. 5 is a plan view of the upper surface side of the circuit board 22 constituting the LED light emitting device 20, and FIG. 6 is a rear view of the circuit board 22. The basic structure is the same as that of the LED light emitting device 10 shown in FIG. Are given the same names and redundant explanations are omitted. Note that FIG. 5 is symmetric about a horizontal center line (not shown), and the upper side of the figure is substantially the same as FIG.

図５のＬＥＤ発光装置２０と図1に示すＬＥＤ発光装置１０との間の注視すべき構成上の差違は、図５において回路基板２２が図１の回路基板２の約2倍の面積を有し、実装するＬＥＤ１ａ〜ｆの数も図１に示すＬＥＤ発光装置１０の２倍（６個）となっているところである。この結果、図１に示す電源電極２ａ、２ｂ、接続電極２ｅ、２ｆに対し、図５では電源電極２２ａ、２２ｂ、接続電極２２ｅ、２２ｆが図の縦方向において２倍の長さとなっている。   The structural difference between the LED light-emitting device 20 of FIG. 5 and the LED light-emitting device 10 shown in FIG. 1 is that the circuit board 22 in FIG. 5 has about twice the area of the circuit board 2 of FIG. In addition, the number of LEDs 1a to f to be mounted is also twice (six) that of the LED light emitting device 10 shown in FIG. As a result, in FIG. 5, the power supply electrodes 22a and 22b and the connection electrodes 22e and 22f are twice as long in the vertical direction of the figure as compared to the power supply electrodes 2a and 2b and the connection electrodes 2e and 2f shown in FIG.

同様に図６に示す回路基板２２の裏面側の電源端子電極２３ａ、２３ｂ、放熱用電極２３ｃ、２３ｄのいずれも、図１に示したＬＥＤ発光装置１０における電源端子電極３ａ、３ｂ、放熱用電極３ｃ、３ｄの約２倍の長さになっている。回路基板２２の上面側の電極２２ａ，２２ｂ，２２ｅ，２２ｆと裏面側の電極２３ａ，２３ｂ，２３ｃ，２３ｄは、それぞれＬＥＤ発光装置１０におけるビア４ａ〜ｄの２倍の個数を有するビア群２４ａ〜ｄで接続している。また各ＬＥＤ１ａ〜ｆの実装構成は、図４のＡ−Ａ断面図およびＢ−Ｂ断面図が図３に示すＬＥＤ発光装置１０の断面図と同じになるので図示は省略した。   Similarly, all of the power supply terminal electrodes 23a and 23b and the heat radiation electrodes 23c and 23d on the back surface side of the circuit board 22 shown in FIG. 6 are the power supply terminal electrodes 3a and 3b and the heat radiation electrodes in the LED light emitting device 10 shown in FIG. It is about twice as long as 3c and 3d. The electrodes 22a, 22b, 22e, and 22f on the upper surface side of the circuit board 22 and the electrodes 23a, 23b, 23c, and 23d on the rear surface side are respectively via groups 24a to 24a that are twice as many as the vias 4a to 4d in the LED light emitting device 10. connected by d. The mounting configurations of the LEDs 1a to f are not shown because the AA sectional view and the BB sectional view of FIG. 4 are the same as the sectional view of the LED light emitting device 10 shown in FIG.

すなわち、ＬＥＤ発光装置２０は図５に示す如く、ＬＥＤ１ａとＬＥＤ１ｄが並列接続、同様にＬＥＤ１ｂとＬＥＤ１ｅが並列接続、さらにＬＥＤ１ｃとＬＥＤ１ｆが並列接続しており、この３組の並列接続グループ（半導体発光素子群）が直列に接続している。そして各ＬＥＤ１ａ〜ｆのＰ電極およびＮ電極はいずれも個数を多くしたサーマルビア群２４ａから２４ｄを通して回路基板２２の裏面側に設けられた電源端子電極２３ａ、２３ｂ及び放熱用電極２３ｃ、２３ｄと低い熱抵抗で接続する。   That is, as shown in FIG. 5, the LED light-emitting device 20 has LED 1a and LED 1d connected in parallel, LED 1b and LED 1e connected in parallel, and LED 1c and LED 1f connected in parallel. Element group) are connected in series. The P electrodes and N electrodes of the LEDs 1a to 1f are as low as the power supply terminal electrodes 23a and 23b and the heat radiation electrodes 23c and 23d provided on the back surface side of the circuit board 22 through the thermal via groups 24a to 24d having a large number. Connect with thermal resistance.

また、図５、図６に示すＬＥＤ発光装置２０は並列接続グループに含まれるＬＥＤの個数が２であった。しかしながらこの個数は２に限られず、回路基板を大きくして電源電極および接続電極の長さを長くすれば、ＬＥＤの並列個数を増加させることが出来る。また接続電極の数を多くすれば直列接続される並列接続グループの数を増加させることもできる。つまり必要に応じて並列接続グループに含まれるＬＥＤの数を変えたり、直列段数を調整したりできる。また各並列接続グループに含まれるＬＥＤの数は異なって良く、たとえば一個のＬＥＤと並列接続グループが直列接続しても良い。一個のＬＥＤが赤色ＬＥＤであり、並列接続グループを構成するＬＥＤが青色ＬＥＤであるような場合に有効である。   In addition, in the LED light emitting device 20 shown in FIGS. 5 and 6, the number of LEDs included in the parallel connection group is two. However, this number is not limited to 2, and the number of LEDs in parallel can be increased by increasing the length of the power supply electrode and the connection electrode by enlarging the circuit board. Further, if the number of connection electrodes is increased, the number of parallel connection groups connected in series can be increased. That is, the number of LEDs included in the parallel connection group can be changed or the number of series stages can be adjusted as necessary. Further, the number of LEDs included in each parallel connection group may be different. For example, one LED and the parallel connection group may be connected in series. This is effective when one LED is a red LED and the LEDs constituting the parallel connection group are blue LEDs.

（第３実施形態におけるＬＥＤ発光装置の説明）
第１実施形態におけるＬＥＤ発光装置１０及び第２実施形態におけるＬＥＤ発光装置２０においては、図１及び図５に示すようにビア４ａ〜ｄ、ビア群２４ａ〜ｄは平面的にＬＥＤ１ａ〜ｆと重なることがないようにしていた。しかしながらビアの数が多い方が放熱効率が向上するのでビアをＬＥＤ１ａ〜ｆと重なる位置に配置しても良い。そこでこのようなＬＥＤ発光装置として図７から図９により本発明の第３実施形態を説明する。図７は本発明の第３実施形態におけるＬＥＤ発光装置３０の樹脂封止前の平面図、図８は図７に示す回路基板の裏面図、図９は図７に示す平面図に樹脂封止を行った完成ＬＥＤ発光装置３０のＡ−Ａ断面図である。ＬＥＤ発光装置３０の基本的構成は図１から図３に示す第１実施形態におけるＬＥＤ発光装置１０と同じであり、図７から図９においてＬＥＤ発光装置１０と同一部材には同一名称を付し、重複する説明を省略する。 (Description of LED Light Emitting Device in Third Embodiment)
In the LED light-emitting device 10 in the first embodiment and the LED light-emitting device 20 in the second embodiment, the vias 4a to 4d and the via groups 24a to 24d overlap the LEDs 1a to f in plan view as shown in FIGS. I was trying to prevent it from happening. However, since the heat dissipation efficiency is improved when the number of vias is large, the vias may be arranged at positions overlapping the LEDs 1a to 1f. Accordingly, a third embodiment of the present invention will be described with reference to FIGS. 7 to 9 as such an LED light emitting device. 7 is a plan view of the LED light emitting device 30 according to the third embodiment of the present invention before resin sealing, FIG. 8 is a back view of the circuit board shown in FIG. 7, and FIG. 9 is a resin seal in the plan view shown in FIG. It is AA sectional drawing of the completion LED light-emitting device 30 which performed. The basic configuration of the LED light emitting device 30 is the same as that of the LED light emitting device 10 in the first embodiment shown in FIGS. 1 to 3, and the same members as those of the LED light emitting device 10 in FIGS. The duplicated explanation is omitted.

図７から図９における第３実施形態のＬＥＤ発光装置３０の回路基板２、電源電極２ａ、２ｂ、接続電極２ｅ、２ｆ、電源端子電極３ａ，３ｂ、及び放熱用電極３ｃ、３ｄは、すべて第１実施形態のＬＥＤ発光装置１０と同じである。一方、ＬＥＤ発光装置３０がＬＥＤ発光装置１０と異なる部分は、ＬＥＤ発光装置３０において電源電極２ａ、接続電極２ｅ、２ｆに設けたビアの数を多くしたことである。   The circuit board 2, power supply electrodes 2a and 2b, connection electrodes 2e and 2f, power supply terminal electrodes 3a and 3b, and heat radiation electrodes 3c and 3d of the LED light emitting device 30 of the third embodiment in FIGS. It is the same as the LED light-emitting device 10 of 1 embodiment. On the other hand, the LED light emitting device 30 is different from the LED light emitting device 10 in that the number of vias provided in the power supply electrode 2a and the connection electrodes 2e and 2f in the LED light emitting device 30 is increased.

すなわち図７、図８に示す如くＬＥＤ発光装置３０の特徴は、電源電極２ａにはＬＥＤ発光装置１０のビア４ａに対応する第１のビア群４ａ１に加え第２のビア群４ａ２を設け、この第２のビア群４ａ２に含まれるビアの一部をＬＥＤ１ａの下面にも配置したことである。同様に接続電極２ｅにも第１のビア群４ｃ１に加え第２のビア群４ｃ２を設け、さらに接続電極２ｅにも第１のビア群４ｄ１に加え第２のビア群４ｄ２を設けており、図９に示す如く、第２のビア群４ａ２、４ｃ２、４ｄ２に含まれるビアの一部をＬＥＤ１ａ、１ｂ、１ｃの下面にも配置している。   That is, as shown in FIGS. 7 and 8, the LED light emitting device 30 is characterized in that the power supply electrode 2 a is provided with the second via group 4 a 2 in addition to the first via group 4 a 1 corresponding to the via 4 a of the LED light emitting device 10. That is, a part of the via included in the second via group 4a2 is also arranged on the lower surface of the LED 1a. Similarly, the connection electrode 2e is provided with a second via group 4c2 in addition to the first via group 4c1, and the connection electrode 2e is provided with a second via group 4d2 in addition to the first via group 4d1. As shown in FIG. 9, a part of vias included in the second via group 4a2, 4c2, 4d2 are also arranged on the lower surfaces of the LEDs 1a, 1b, 1c.

ＬＥＤ発光装置３０では、第１実施形態のＬＥＤ発光装置１０において電源電極２ａと電源端子電極３ａを接続するビア４ａ及び、接続電極２ｅ、２ｆと放熱用電極３ｃ、３ｄとを接続するビア４ｃ、４ｄに対しの数を各々２倍に増加して、ＬＥＤ１ａ、１ｂ、１ｃからさらに強力に放熱できるようにしている。   In the LED light emitting device 30, in the LED light emitting device 10 of the first embodiment, a via 4a that connects the power electrode 2a and the power terminal electrode 3a, and a via 4c that connects the connection electrodes 2e and 2f and the heat radiation electrodes 3c and 3d, The numbers for 4d are each doubled so that the LEDs 1a, 1b, and 1c can dissipate power more strongly.

以上の如く、本発明においては回路基板の上面にフリップチップ実装したＬＥＤが接続電極を介して直列接続しているとき、そのＬＥＤの接続電極に対応する回路基板の裏面側に放熱用電極を設け、電気伝導性を有するビアで接続することにより各ＬＥＤの放熱性を良くするものである。すなわち、図１２に示したように従来から初段のＬＥＤ（ＬＥＤ２０１ｃ）はアノード用電極（電源端子電極２０３ｂ）がスルーホール（スルーホール２０４ｂ）を介してのＰ電極と接続していたので放熱効率はよかった。しかしながら次段以降のＬＥＤ（ＬＥＤ２０１ｂ，２０１ａ）は、Ｐ電極が接続する回路基板の電極（接続電極２０２ｆ，２０２ｅ）にスルーホールがなかったため放熱を回路基板の熱伝導に頼らざるを得なかった。これに対し本発明のＬＥＤ発光装置では、直列接続のためＰ電極が接続する回路基板の電極（接続電極２ｅ，２ｆ等）がスルーホール（スルーホール４ｃ、４ｄ等）で回路基板裏面の放熱用金属パターン（放熱用電極３ｃ、３ｄ等）と接続し、熱伝導の主要部をスルーホールとしたことが大きな特徴となっている。この構成はＬＥＤに限定されず発熱を伴う半導体素子には全て適用できるものである。   As described above, in the present invention, when the LED flip-chip mounted on the upper surface of the circuit board is connected in series via the connection electrode, the heat radiation electrode is provided on the back side of the circuit board corresponding to the connection electrode of the LED. The heat dissipation of each LED is improved by connecting vias having electrical conductivity. That is, as shown in FIG. 12, since the first-stage LED (LED 201c) has conventionally been connected to the P electrode through the through hole (through hole 204b), the anode electrode (power supply terminal electrode 203b) has a heat dissipation efficiency of Was good. However, the LEDs in the subsequent stages (LEDs 201b and 201a) have to rely on the heat conduction of the circuit board for heat dissipation because there are no through holes in the electrodes (connection electrodes 202f and 202e) of the circuit board to which the P electrode is connected. On the other hand, in the LED light-emitting device of the present invention, the electrodes (connection electrodes 2e, 2f, etc.) of the circuit board to which the P electrode is connected for series connection are through holes (through holes 4c, 4d, etc.) for heat radiation on the back side of the circuit board. The main feature is that it is connected to a metal pattern (heat dissipating electrodes 3c, 3d, etc.) and the main part of heat conduction is a through hole. This configuration is not limited to LEDs and can be applied to all semiconductor elements that generate heat.

１ａ、１ｂ、１ｃ、１ｄ、１ｅ、１ｆ、 ＬＥＤ（半導体発光素子）
１０１ａ、１０１ｂ、２０１ａ、２０１ｂ、２０１ｃ ＬＥＤ
２、２２、１０２、２０２ 回路基板
２ａ、２ｂ、２２ａ、２２ｂ 電源電極
１０２ａ、１０２ｂ、２０２ａ、２０２ｂ 電源電極
２ｅ、２ｆ、２２ｅ、２２ｆ 接続電極
１０２ｅ、２０２ｅ、２０２ｆ 接続電極
３ａ、３ｂ、２３ａ、２３ｂ、２０３ａ、２０３ｂ 電源端子電極
３ｃ、３ｄ 放熱用電極
４ａ、４ｂ、４ｃ、４ｄ ビア
４ａ１，４ａ２、４ｃ１，４ｃ２，４ｄ１，４ｄ２ ビア群
２４ａ、２４ｂ、２４ｃ、２４ｄ ビア群
１０４、２０４ａ、２０４ｂ サーマルビア
６、１０６、２０６ 保護樹脂
１０、２０、３０、１００、２００ ＬＥＤ発光装置
４０ マザー基板
４０ａ、４０ｂ 電源供給用電極
４０ｃ、４０ｄ 放熱用ダミー電極
１０５ ワイヤー
Ｐ Ｐ電極
Ｎ Ｎ電極
1a, 1b, 1c, 1d, 1e, 1f, LED (semiconductor light emitting device)
101a, 101b, 201a, 201b, 201c LED
2, 22, 102, 202 Circuit board 2a, 2b, 22a, 22b Power supply electrode 102a, 102b, 202a, 202b Power supply electrode 2e, 2f, 22e, 22f Connection electrode 102e, 202e, 202f Connection electrode 3a, 3b, 23a, 23b , 203a, 203b Power supply terminal electrode 3c, 3d Heat dissipation electrode 4a, 4b, 4c, 4d Via 4a1, 4a2, 4c1, 4c2, 4d1, 4d2 Via group 24a, 24b, 24c, 24d Via group 104, 204a, 204b Thermal via 6, 106, 206 Protective resin 10, 20, 30, 100, 200 LED light emitting device 40 Mother board 40a, 40b Power supply electrode 40c, 40d Heat radiation dummy electrode 105 Wire PP electrode N N electrode

Claims (4)

回路基板上に複数の半導体発光素子をフリップチップ実装し、該複数の半導体発光素子を回路基板上に設けた接続電極により直列接続する半導体発光装置において、前記回路基板の裏面側に放熱用電極を備え、前記接続電極と前記放熱用電極とが導電性を有するビアで接続することを特徴とする半導体発光装置。   In a semiconductor light-emitting device in which a plurality of semiconductor light-emitting elements are flip-chip mounted on a circuit board and the plurality of semiconductor light-emitting elements are connected in series by connection electrodes provided on the circuit board, a heat dissipation electrode is provided on the back side of the circuit board. A semiconductor light emitting device, wherein the connection electrode and the heat radiation electrode are connected by a conductive via. 複数の前記半導体発光素子は並列接続した半導体発光素子群を含み、前記半導体発光素子群同士又は前記半導体発光素子と他の前記半導体発光素子群とが前記接続電極により直列接続することを特徴とする請求項１に記載の半導体発光装置。   The plurality of semiconductor light emitting elements include a group of semiconductor light emitting elements connected in parallel, and the semiconductor light emitting element groups or the semiconductor light emitting elements and another semiconductor light emitting element group are connected in series by the connection electrode. The semiconductor light emitting device according to claim 1. 前記ビアは１つの接続電極に複数個設けられていることを特徴とする請求項１又は2に記載の半導体発光装置。   3. The semiconductor light emitting device according to claim 1, wherein a plurality of the vias are provided in one connection electrode. 前記回路基板は、その上面に電源電極、裏面に電力を供給する電源端子電極を備え、前記電源電極と前記電源端子電極とが前記ビアにより接続していることを特徴とする請求項１から３のいずれか一項に記載の半導体発光装置。
The circuit board includes a power supply electrode on the top surface and a power supply terminal electrode for supplying power to the back surface, and the power supply electrode and the power supply terminal electrode are connected by the via. The semiconductor light-emitting device as described in any one of these.
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