JP2004021078A - Combiner optical system and information display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combiner optical system capable of securing high performance and high versatility though it has an eyesight correcting function, and an information display device. <P>SOLUTION: The combiner optical system is equipped with: a base plate arranged to cross with the optical axis of an observation eye, transmitting external light made incident on the pupil position of the observation eye and also forming the optical path of luminous flux for display introduced from a specified picture display element; a catoptric element provided in the optical path on the base plate and superposing the luminous flux for display on the external light and guiding it to the pupil position of the observation eye; a 1st dioptric lens which is arranged to cross with the optical axis on the side of the base plate on which the external light is made incident, and whose surface on the external side is convex; and a 2nd dioptric lens which is arranged to cross with the optical axis on the side of the base plate where the external light is emitted, and whose surface on the pupil position side is concave. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention is applied to an information display device such as an eye glass display, an HMD (head mounted display), and a wearable personal computer, and relates to a combiner optical system that superimposes a display image on external light and guides it to an observation eye, and an information display device thereof. .
[0002]
[Prior art]
An eyeglass display for superimposing an information image on the outside world has an eyeglass-like shape for fixing to a user's head, for example, an image display element for displaying an image, and A transparent substrate having an outer shape similar to a spectacle lens is fixed to a spectacle frame, and a HOE (holographic optical element) for guiding a display light beam from the image display element to an eye is formed in the substrate. (Note that the optical system portion such as the substrate of the eye glass display and the HOE is called a “combiner optical system”.)
[0003]
[Problems to be solved by the invention]
However, general eyeglasses (eyeglasses for correcting vision) cannot be used in combination with the eyeglass display, so that people who use eyeglasses in daily life remove the eyeglasses when using the eyeglass display, resulting in naked eyesight. We have to allow the outside world to be hard to see. Therefore, at present, it is desired to add a vision correcting function to a combiner optical system inside an eyeglass display.
[0004]
Here, Japanese Patent Application Laid-Open No. 2002-90687 proposes a combiner optical system to which a visual acuity correcting function is added.
The first proposed combiner optical system (FIG. 4 in Japanese Patent Application Laid-Open No. 2002-90687) has a spectacle lens arranged on the eye side of the substrate in order to add a vision correction function.
[0005]
However, if both surfaces of the spectacle lens are curved to correct aberrations (satisfying the solution of Tscherning), it may be difficult to secure eye relief. In addition, if one surface of the spectacle lens is made flat, the problem does not occur, but the problem of insufficient correction of aberration occurs.
Also, the proposed second combiner optical system (FIG. 5 of Japanese Patent Application No. 2002-90687) applies power to the substrate surface in order to add a vision correction function.
[0006]
However, if the substrate is processed according to the visual acuity, a dedicated substrate is required for each user of each visual acuity, and the versatility of the combiner optical system and, consequently, the versatility of the eyeglass display are reduced.
Therefore, an object of the present invention is to provide a combiner optical system and an information display device that can ensure high performance and high versatility while having a vision correction function.
[0007]
[Means for Solving the Problems]
The combiner optical system according to claim 1 is arranged so as to intersect with the optical axis of the observation eye, transmits external light incident on the pupil position of the observation eye, and displays an image introduced from a predetermined image display element. A substrate that forms an optical path of a light beam for use, a reflective optical element that is provided in the optical path of the substrate, and guides the display light beam to the pupil position of the observation eye by superimposing the display light beam on the external light; and A first refraction lens which is disposed so as to intersect the optical axis on the side where the external light is incident, and whose outer surface is a convex surface, and intersects the optical axis on the side of the substrate where the external light exits And a second refraction lens having a concave surface on the pupil position side thereof.
[0008]
The combiner optical system according to claim 2 is the combiner optical system according to claim 1, wherein the first refraction lens and the second refraction lens have a gap with respect to at least a portion of the substrate where the optical path is formed. Is placed. The combiner optical system according to claim 3 is the combiner optical system according to claim 1 or 2, wherein at least the incident region and the exit region of the external light of the substrate are planes, and the first refraction is performed. The lens is a plano-convex lens, and the second refraction lens is a plano-concave lens.
[0009]
The combiner optical system according to claim 4 is the combiner optical system according to claim 1 or 2, wherein at least the incident region and the exit region of the external light of the substrate are a convex surface and a concave surface, respectively. The first refraction lens and the second refraction lens are meniscus lenses.
A combiner optical system according to claim 5, wherein the combiner optical system according to claim 1, wherein a part of the convex surface of the first refractive lens has a convex surface for double focus. Is provided.
[0010]
The combiner optical system according to claim 6 is the combiner optical system according to any one of claims 1 to 5, wherein the convex surface of the first refractive lens is an aspheric surface. .
A combiner optical system according to a seventh aspect is the combiner optical system according to any one of the first to sixth aspects, wherein the reflection optical element is a hologram element.
[0011]
The combiner optical system according to claim 8, wherein the display is arranged so as to intersect the optical axis of the observation eye, transmits external light incident on a pupil position of the observation eye, and is introduced from a predetermined image display element. A substrate forming an optical path of a light beam for use, disposed on the side of the substrate on which the external light is incident so as to intersect with the optical axis, and the external surface is a convex surface, and the optical path is continuous with the optical path. A first refraction lens for forming an optical path of a display light beam therein, and a first refraction lens disposed on the side of the substrate where the external light exits, so as to intersect the optical axis, and having a concave surface on the pupil position side. A birefringent lens, and a reflecting optical element provided in the optical path of the first refracting lens and superimposing the display light beam on the external light and guiding the display light beam to a pupil position of the observation eye. I do.
[0012]
In a combiner optical system according to a ninth aspect, in the combiner optical system according to the eighth aspect, the second refraction lens is disposed with a gap between at least a portion of the substrate where the optical path is formed. It is characterized by the following.
The combiner optical system according to claim 10 is the combiner optical system according to claim 8 or claim 9, wherein at least the incident region and the exit region of the external light of the substrate are planes, and the first refraction is performed. The lens is a plano-convex lens, and the second refraction lens is a plano-concave lens.
[0013]
The combiner optical system according to claim 11 is the combiner optical system according to claim 8 or claim 9, wherein at least the incident region and the exit region of the external light of the substrate are a convex surface and a concave surface, respectively. The first refraction lens and the second refraction lens are meniscus lenses.
The combiner optical system according to claim 12, wherein in the combiner optical system according to any one of claims 8 to 11, a part of the convex surface of the first refractive lens has a convex surface for double focus. Is provided.
[0014]
The combiner optical system according to claim 13 is the combiner optical system according to any one of claims 8 to 12, wherein the convex surface of the first refractive lens is an aspheric surface. .
A combiner optical system according to a fourteenth aspect is the combiner optical system according to any one of the eighth to thirteenth aspects, wherein the reflection optical element is a hologram element.
[0015]
An information display device according to claim 15, comprising: an image display element that displays an image; a combiner optical system according to any one of claims 1 to 7; and the image display element and the combiner optical system. A support means for fixing each part to the observation eye is provided.
[0016]
An information display device according to a sixteenth aspect is the information display device according to the fifteenth aspect, wherein the support means is capable of detachably attaching the first refraction lens and the second refraction lens.
An information display device according to claim 17, comprising: an image display element that displays an image; a combiner optical system according to any one of claims 8 to 14; and the image display element and the combiner optical system. A support means for fixing each part to the observation eye is provided.
[0017]
An information display device according to an eighteenth aspect of the present invention is the information display device according to the seventeenth aspect, wherein the support means is capable of attaching and detaching the first refraction lens and the second refraction lens.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0019]
[First Embodiment]
A first embodiment of the present invention will be described with reference to FIGS.
In the present embodiment, an information display device (an eye glass display as an example) of the present invention equipped with the combiner optical system of the present invention will be described. Here, a hologram combiner optical system will be described as the combiner optical system.
[0020]
FIG. 1 is an external view of an eyeglass display of the present embodiment, and FIGS. 2 and 3 are diagrams showing a configuration and an optical path of a combiner optical system 1 of the present embodiment. FIG. 3 is a partially enlarged view of FIG. The hologram combiner optical system 1 has a symmetrical shape with respect to the YZ plane (refer to a coordinate system described later).
As shown in FIG. 1, the eyeglass display has an appearance similar to eyeglasses. That is, for a supporting member 16 similar to a supporting member of spectacles (for example, a frame composed of a bridge and a temple connecting two lenses for both eyes), instead of one spectacle lens, substantially the same as a spectacle lens The light source unit 3 and the substrate 15 having the external shape described above are fixed.
[0021]
The hologram combiner optical system 1 indicated by a dotted line in FIGS. 2 and 3 includes a substrate 15 and a correction optical system 18 disposed in the light source unit 3. The HOE 17 is provided in the substrate 15 (the correction optical system 18 can be omitted when weight reduction is more important than imaging performance).
In the light source unit 3, in addition to the correction optical system 18, an image display element 20 such as a transmission LCD is disposed. The image displayed by the image display element 20 may be a still image or a moving image.
[0022]
In FIG. 3, reference numeral D denotes a display surface of the image display element 20. When the image display element 20 is not of a self-luminous type, the light source unit 3 also has an illumination optical system for illuminating the image display element 20.
Hereinafter, the hologram combiner optical system 1 is for the left eye, and is arranged in front of the left eye of the user, similarly to the eyeglass lens for the left eye (the support member 16 supports the front of the right eye). These are ordinary spectacle lenses or the like adapted to the corrected vision of the right eye of the user.)
[0023]
Therefore, in the following, an XYZ orthogonal coordinate system having an origin at the center of the pupil P of the left eye is defined. As shown, the + Z direction of these coordinates is in front of the user, the + Y direction is to the left of the user, and the + X direction is below the user.
The substrate 15 of the hologram combiner optical system 1 is formed of a parallel flat plate made of a transparent glass or plastic disposed in parallel with the XY plane in order to guide the external light to the pupil P of the left eye of the user with almost no distortion. The substrate 15 is not adapted to a specific visual acuity, but can be adapted to various visual acuities. That is, the substrate 15 has no power with respect to external light.
[0024]
In the substrate 15, the HOE 17 is disposed on the Z axis and is provided so as to be inclined around an axis parallel to the X axis.
The HOE 17 is formed on the substrate 15 by, for example, temporarily cutting the prototype of the substrate 15 into two elements along a surface on which the HOE 17 is to be disposed, sandwiching the HOE 17 between the cut parts of the two elements, and then bonding the two elements with an adhesive ( The refractive index is substantially the same as that of the substrate 15).
[0025]
The HOE 17 is a reflection hologram element, for example, a volume hologram element. The HOE 17 has the power to convert the shape of the wavefront of the display light beam incident from the light source unit 3 into a wavefront close to a parallel light beam.
The light source unit 3 is arranged so that the display light beam is incident on the substrate 15 from, for example, the −Z direction.
[0026]
In addition, the wavelength selectivity (peak wavelength of diffraction efficiency) of the HOE 17 and the light source wavelength of the light source unit 3 are mutually optimized, and the HOE 17 acts on the display light flux from the light source unit 3, Has little effect.
The arrangement and shape of each optical surface of the hologram combiner optical system 1 (each optical surface of the substrate 15 and the correction optical system 18) are determined in consideration of the arrangement position and the arrangement angle of the display surface D in the light source unit 3. Optimized for
[0027]
As a result, the display light flux emitted from the display surface D in the light source unit 3 is incident on the substrate 15 via the correction optical system 18 in the light source unit 3, and then the + Z side surface 15b of the substrate 15 and- The light propagates through the substrate 15 so as to crawl in the YZ plane while sequentially repeating reflection on the surface 15a on the Z side, then enters the HOE 17 and approaches a parallel light beam, proceeds in the direction of -Z, and proceeds to the pupil P of the left eye of the user. Incident on.
[0028]
Here, in order to provide the hologram combiner optical system 1 of the present embodiment with a visual acuity correcting function for the left eye of the user, a surface 19ra on the pupil P side of the pupil P side of the substrate 15 and the opposite side thereof are provided. A second refraction lens 19r having a concave surface and a first refraction lens 19f having a convex surface 19fa on the outside world are arranged.
[0029]
Note that the outer shape of the second refraction lens 19r and the first refraction lens 19f does not need to be the same as the outer shape of the substrate 15, and it is sufficient that at least the size of the optical path cross section of the external light incident on the pupil P is sufficient.
Incidentally, the outer shape of the substrate 15 has a sufficiently long length in the Y direction in order to ensure a sufficient optical path length of the display light flux.
[0030]
In the present embodiment, the surface 15a on the pupil P side of the substrate 15 and the surface 15b on the opposite side thereof are both flat, so that the surface 19rb on the substrate 15 side of the second refraction lens 19r and the substrate 15 of the first refraction lens 19f. The surface 19fb on the 15 side is also flat (see FIG. 3).
The second refraction lens 19r and the first refraction lens 19f are arranged with a slight gap (air gap, so-called air gap) at least with respect to the portion of the substrate 15 where the optical path of the display light beam is formed. (See FIG. 3).
[0031]
By setting the arrangement of the first refraction lens 19f and the second refraction lens 19r in this manner, the total reflection effect of the display light flux on the surfaces (boundary surfaces) 15a and 15b in the substrate 15 is not hindered. Even if the birefringent lens 19r and the first refracting lens 19f are added, the function of the hologram combiner optical system 1 as a combiner is not impaired at all.
[0032]
The shape of the surfaces 19ra, 19rb, 19fa, and 19fb of the optical system including the second refraction lens 19r, the substrate 15, and the first refraction lens 19f, and the positional relationship between the surfaces 19ra, 19rb, 15a, 15b, 19fa, and 19fb are as follows. An optical power corresponding to the visual acuity of the left eye of the user is applied to the entirety thereof, and optimization is performed so that aberrations are sufficiently corrected.
[0033]
In particular, since this optical system has a concave surface 19ra and a convex surface 19fa, it is possible to satisfy the solution of Tscherning.
At the time of optimization, it is preferable that the thickness of each of the first refraction lens 19f and the second refraction lens 19r be as small as possible.
In particular, in the present embodiment, since one of the second refractive lenses 19r is flat, it is easy in design to make it thinner. As a result, the eye relief of the hologram combiner optical system 1 is sufficiently ensured.
[0034]
The reason why the thinning is facilitated is that the shape of the surface 19rb of the second refraction lens 19r is close to the shape of the surface 15b of the substrate 15, and the shape of the surface 19fa of the first refraction lens 19f is Tscherning. If the solution is selected so as to satisfy the above solution, it is possible to realize a shape with a sufficiently small amount of astigmatism while realizing the power required for the predetermined visual acuity correcting function while maintaining the thinned state.
[0035]
Further, the hologram combiner optical system 1 of the present embodiment can correct the apparent distance of the display surface D independently of the shapes of the surfaces 19fa and 19ra. For example, it is possible to adjust the apparent distance of the display surface D to a distance that is easy for the user to see by simply adjusting the distance between the correction optical system 18 and the image display element 20 as appropriate.
As described above, the hologram combiner optical system 1 and the eyeglass display according to the present embodiment add a visual acuity correcting function by adding the first refraction lens 19f and the second refraction lens 19r without changing the substrate 15, so that the general-purpose Sex is secured.
[0036]
Also, even with the addition, the performance as a hologram combiner is ensured.
In addition, since the two refractive lenses (the first refractive lens 19f and the second refractive lens 19r) can appropriately correct aberrations, the effect of correcting vision is high.
Next, a method of fixing the first refraction lens 19f and the second refraction lens 19r added to the hologram combiner optical system 1 will be described.
[0037]
As for the method of fixing the first refraction lens 19f and the second refraction lens 19r, various forms such as a clip-on type are conceivable as in the case of adding another lens to the spectacle lens of general spectacles.
In the present embodiment, the first refraction lens 19f and the second refraction lens 19r are directly fixed to the substrate 15.
[0038]
For example, the second refraction lens 19r and the first refraction lens 19f are fixed to the substrate 15 with screws S, respectively. If only the screw S is removed, the first refraction lens 19f and the second refraction lens 19r can be separated from the substrate 15, so that the first refraction lens 19f and the second refraction lens 19r can be detachably attached to the support member 16, respectively.
Therefore, in this eyeglass display, the first refraction lens 19f and the second refraction lens 19r can be attached and detached as needed by the user.
[0039]
In addition, a combination of the first refraction lens 19f and the second refraction lens 19r is prepared for each visual acuity, and the combination is exchanged according to the visual acuity of the user's eye (here, the left eye). Multiple users of vision can share one eyeglass display.
The second refraction lens 19r, the first refraction lens 19f, and the substrate 15 each have, in advance, micro holes (grooves cut into the grooves of the screws S) through which the screws S pass, as shown in FIG. Micro holes) are provided.
[0040]
Further, the fixing position of the screw S (that is, the position where the minute hole is formed) is a position which does not obstruct the optical path of the display light beam shown in FIG. 3 and which does not obstruct the optical path of the external light entering the pupil P as much as possible. . In addition, it is preferable to fix three points as shown in FIG. 1 (hereinafter, referred to as three points) because screws S can be fixed stably.
Further, between the second refraction lens 19r and the substrate 15 and between the first refraction lens 19f and the substrate 15 are fixed via a washer (washer W through which the screw S penetrates) W to provide the above-mentioned gap. You.
[0041]
However, in order to make the gap uniform, the thicknesses of the three washers W provided between the second refraction lens 19r and the substrate 15 are the same, and the thickness between the first refraction lens 19f and the substrate 15 is Are the same in thickness.
For simplicity, the space may be filled with air. However, it is desirable to fill the gap between the periphery of the first refraction lens 19f, the periphery of the second refraction lens 19r and the substrate 15 with a sealing material (preferably a transparent sealing material) so that dust and the like do not enter the gap.
[0042]
[Modification of First Embodiment]
In the above embodiment, the hologram combiner optical system 1 in which both surfaces 15a and 15b of the substrate 15 are flat, the first refraction lens 19f is a plano-convex lens, and the second refraction lens 19r is a plano-concave lens has been described. The same effects as described above can be obtained even if the configurations shown in FIGS.
[0043]
FIG. 4A shows a configuration in which the surface 15a 'on the pupil P side of the substrate 15' is a concave surface, and the opposite surface 15b 'is a convex surface having the same shape as the surface 15a'.
Accordingly, the second refractive lens 19r 'is a meniscus lens, and in particular, the surface 19rb' on the substrate 15 'side has a curved surface (the same shape as the surface 15a') along the surface 15a '.
[0044]
The first refraction lens 19f 'is also a meniscus lens. In particular, the surface 19fb' of the substrate 15 'is also a curved surface (the same shape as the surface 15b') along the surface 15b '.
At this time, the gap between the substrate 15 'and the first refraction lens 19f' and the gap between the substrate 15 'and the second refraction lens 19r' are all uniform.
[0045]
In this configuration, one surface 15b 'of the substrate 15' is convex and the other surface 15a 'is concave. However, since both surfaces have the same surface shape, the substrate 15' alone has no power with respect to external light.
Therefore, the substrate 15 'has the same versatility as the substrate 15 of the first embodiment, and therefore, the versatility of the hologram combiner optical system and the versatility of the eyeglass display are maintained.
[0046]
Further, according to this configuration in which the substrate 15 ′ has a curvature, it is possible to reduce the thickness of the entire optical system including the first refractive lens 19f ′, the substrate 15 ′, and the second refractive lens 19r ′. . In this case, it also contributes to weight reduction.
FIG. 4B shows a configuration in which a convex surface 23 having a different curvature is provided on a part of the surface 19fa of the first refractive lens 19f.
The surface 19fa provided with such a convex surface 23 arranges two focal points at different positions in the optical axis direction. That is, the surface 19fa has the same function as the outer surface of general bifocal glasses (a kind of reading glasses). That is, the function of the bifocal glasses is added to the hologram combiner optical system 1.
[0047]
In addition, since other parts are the same as those of the first embodiment, the configuration of FIG. 4B can obtain the same effect as the first embodiment while adding the function of the bifocal glasses.
The surface 19fa of the first refraction lens 19f is not limited to the one shown in FIG. 4B, and can be deformed into another shape according to the characteristics of the user's eyes.
[0048]
For example, the surface 19fa may be an aspheric surface instead of a spherical surface. For example, by using an anamorphic surface, the function of astigmatic glasses can be added. This configuration is also the same as that of the first embodiment in the other parts, so that the same effect as in the first embodiment can be obtained while adding the function of astigmatism glasses. Further, a function of trifocal glasses or progressive focus glasses may be added.
[0049]
Further, the surface 19ra of the second refraction lens 19r may be an aspheric surface such as an anamorphic surface. If this surface 19ra disposed closer to the pupil P than the substrate 15 is, for example, an anamorphic surface, it is possible to generate astigmatism correction not only for external light but also for display light flux.
[0050]
The surface 19fb 'of the first refraction lens 19f' and the surface 19rb 'of the second refraction lens 19r' (both are curved surfaces) shown in FIG. 4A are anamorphic if necessary. It may be an aspheric surface such as a surface.
[Second embodiment]
A second embodiment of the present invention will be described with reference to FIG.
[0051]
In the present embodiment, an information display device (an eye glass display as an example) of the present invention equipped with the combiner optical system of the present invention will be described. Here, a hologram combiner optical system will be described as the combiner optical system. The difference between the present embodiment and the first embodiment resides in the hologram combiner optical system. Therefore, here, the difference between the hologram combiner optical system of the present embodiment and the hologram combiner optical system 1 of the first embodiment is described. Will be described only.
[0052]
FIG. 5 is a diagram showing the configuration and the optical path (only the optical path of the principal ray) of the hologram combiner optical system 2 of the present embodiment.
Unlike the hologram combiner optical system 1 shown in FIG. 3, the hologram combiner optical system 2 has no gap between the substrate 15 and the first refraction lens 19f. That is, the washer W between the substrate 15 and the first refraction lens 19f is removed.
[0053]
Accordingly, the HOE 17 is formed, for example, on a curved surface in front of the pupil P and inside the surface 19fa.
At this time, the display light flux emitted from the display surface D also travels inside the first refraction lens 19f as shown in FIG.
Here, the surface 19fa of the first refraction lens 19f is a convex surface (however, a concave surface when viewed from the inside of the first refraction lens 19f), so that a positive power is applied to the display light flux reflected by the surface 19fa.
[0054]
Generally, in the hologram combiner optical system, the optical system including the substrate 15 and the correction optical system 18 must have a positive power. However, if the surface 19fa is used to reflect the display light beam, (Particularly for the diffraction action of the HOE 17) requires less power. Incidentally, it is preferable that the power allocated to the diffraction action of the HOE 17 is small, because the chromatic aberration is suppressed.
[0055]
Therefore, according to the present embodiment, it is possible to enhance the overall performance of the hologram combiner optical system 2.
Also in the present embodiment, as in the configuration of FIG. 4A in the first embodiment, the surfaces 15a and 15b of the substrate 15, the surface 19fb of the first refractive lens 19f, and the surface 19rb of the second refractive lens 19r. May have a curvature.
[0056]
Also, in the present embodiment, as in the configuration of FIG. 4B in the first embodiment, the surface 19fa of the first refraction lens 19f is used for double focus in accordance with the characteristics of the user's eyes. It may be a surface, a surface for triple focus, or an aspherical surface (a surface for progressive focus, an anamorphic surface, etc.). Further, the surface 19ra of the second refraction lens 19r may be an aspheric surface.
[0057]
When an anamorphic surface is used, an anamorphic correction optical system 28 may be inserted into the optical path of the display light beam of the hologram combiner optical system 2 as indicated by reference numeral 28 in FIG. (In the figure, the correcting optical system 28 is fixed to the surface 15a of the substrate 15, but may be arranged in the light source unit 3 (see FIG. 1).) According to the correcting optical system 28, the virtual image on the display surface D can be adapted to astigmatism. (Note that such a correcting optical system 28 has the surface 19fa in the hologram combiner optical system of the first embodiment. The same arrangement is possible when the anamorphic surface is used.)
[0058]
[Others]
FIG. 1 shows a so-called rimless type frame composed of a combination of a bridge and a temple as the supporting member 16 (the supporting member 16 and the screw S correspond to supporting means in the claims), but the present invention. Is not limited to this. For example, the support member 16 may be a full rim type frame having a rim that supports the substrate 15 from the periphery.
[0059]
In the case of a full rim type, the first refraction lens 19f and the second refraction lens 19r may be fixed to the rim.
Also, in each of the above embodiments, the eyeglass display that presents information to only one eye has been described, but the combiner and the information display device of the present embodiment can also be applied to those that present information to both eyes. It is.
[0060]
Further, in each of the above embodiments, the eyeglass display has been described. However, the combiner optical system of the present embodiment can be applied to an HMD, a wearable personal computer, and the like.
In each of the above embodiments, the hologram combiner optical system using the hologram element as the reflection optical element has been described. However, a combiner optical system using a half mirror instead of the HOE, a substrate, and a lens instead of the correction optical system. The present invention is also applicable.
[0061]
【The invention's effect】
As described above, according to the present invention, a combiner optical system and an information display device capable of ensuring high performance and high versatility while having a vision correction function are realized.
[Brief description of the drawings]
FIG. 1 is an external view of an eyeglass display according to a first embodiment.
FIG. 2 is a diagram illustrating a configuration and an optical path of a combiner optical system 1 according to the first embodiment.
FIG. 3 is a partially enlarged view of FIG. 2;
FIG. 4 is a diagram illustrating another embodiment.
FIG. 5 is a diagram illustrating a configuration and an optical path (only an optical path of a principal ray) of a hologram combiner optical system 2 according to a second embodiment.
[Explanation of symbols]
1,2 Hologram combiner optical system
16 Supporting members
3 Light source unit
15 Substrate
17 HOE (hologram element)
18, 28 Optical system for correction
20 Image display device
19f first refraction lens
19r Second refraction lens
15a, 15b, 19fa, 19ra surface
W washer
S screw
P pupil
D display surface

Claims (18)

A substrate that is arranged to intersect with the optical axis of the observation eye and transmits external light incident on the pupil position of the observation eye, and forms an optical path of a display light flux introduced from a predetermined image display element,
A reflective optical element provided in the optical path of the substrate, and guiding the display light flux to the pupil position of the observation eye by superimposing the display light flux on the external light;
A first refractive lens disposed on the side of the substrate on which the external light is incident so as to intersect with the optical axis, and having a convex surface on the external side;
A combiner optical system, comprising: a second refraction lens disposed on the side of the substrate where the external light exits so as to intersect the optical axis and having a concave surface on the pupil position side. The combiner optical system according to claim 1,
The combiner optical system according to claim 1, wherein the first refraction lens and the second refraction lens are arranged with a gap at least at a portion of the substrate where the optical path is formed. 3. The combiner optical system according to claim 1, wherein at least the incident area and the emission area of the external light of the substrate are planes,
The first refraction lens is a plano-convex lens,
The combiner optical system, wherein the second refraction lens is a plano-concave lens. The combiner optical system according to claim 1 or 2,
At least the incident area and the emission area of the external light of the substrate are convex and concave, respectively.
The combiner optical system, wherein the first refraction lens and the second refraction lens are meniscus lenses. In the combiner optical system according to any one of claims 1 to 4,
A combiner optical system, wherein a part of the convex surface of the first refraction lens is provided with a convex surface for double focus. In the combiner optical system according to any one of claims 1 to 5,
The combiner optical system according to claim 1, wherein the convex surface of the first refractive lens is an aspheric surface. In the combiner optical system according to any one of claims 1 to 6,
The combiner optical system, wherein the reflection optical element is a hologram element. A substrate that is arranged to intersect with the optical axis of the observation eye and transmits external light incident on the pupil position of the observation eye, and forms an optical path of a display light flux introduced from a predetermined image display element,
The substrate is disposed on the side on which the external light is incident so as to intersect with the optical axis, and the surface on the external side is convex, and forms an optical path of the display light flux continued in the optical path therein. A first refractive lens,
A second refraction lens disposed on the side of the substrate where the external light exits so as to intersect the optical axis, and having a concave surface on the pupil position side;
A combiner optical system comprising: a reflection optical element provided in the optical path of the first refraction lens and superimposing the display light beam on the external light and guiding the display light beam to a pupil position of the observation eye. The combiner optical system according to claim 8,
The combiner optical system according to claim 1, wherein the second refraction lens is disposed with a gap at least at a portion of the substrate where the optical path is formed. In the combiner optical system according to claim 8 or 9,
At least the incident area and the emission area of the external light of the substrate are planes,
The first refraction lens is a plano-convex lens,
The combiner optical system, wherein the second refraction lens is a plano-concave lens. In the combiner optical system according to claim 8 or 9,
At least the incident area and the emission area of the external light of the substrate are convex and concave, respectively.
The combiner optical system, wherein the first refraction lens and the second refraction lens are meniscus lenses. In the combiner optical system according to any one of claims 8 to 11,
A combiner optical system, wherein a part of the convex surface of the first refraction lens is provided with a convex surface for double focus. In the combiner optical system according to any one of claims 8 to 12,
The combiner optical system according to claim 1, wherein the convex surface of the first refractive lens is an aspheric surface. The combiner optical system according to any one of claims 8 to 13, wherein:
The combiner optical system, wherein the reflection optical element is a hologram element. An image display element for displaying an image,
A combiner optical system according to any one of claims 1 to 7,
An information display device comprising: a support unit for fixing each part of the image display element and the combiner optical system to the observation eye. The information display device according to claim 15,
The support means,
An information display device, wherein the first refraction lens and the second refraction lens are detachable. An image display element for displaying an image,
A combiner optical system according to any one of claims 8 to 14,
An information display device comprising: a support unit for fixing each part of the image display element and the combiner optical system to the observation eye. The information display device according to claim 17,
The support means,
An information display device, wherein the first refraction lens and the second refraction lens are detachable.

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