JP2018173661A - Optical device having spectacle lens, spectacles using the same, and spectacle type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical device having a spectacle lens, spectacles using the optical device, and a spectacle type display device that can acquire an image, in particular, using a simple optical mechanism and spectacle lens thin in film thickness, or can display the image as compared with the conventional.SOLUTION: In an optical device including a spectacle lens provided with a light reflection layer, a light reflection layer (4) is transparent, and the light reflection layer (4) has an inclination angle (θ1) larger than 0° and smaller than 30° relative to a direction (X) orthogonal to an optical axis of the spectacle lens. An image light functional unit is provided for acquiring image light reflected obliquely relative to an optical axis direction by the light reflection layer (4), and/or outputting the image light toward the spectacle lens in an oblique direction relative to the optical axis direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an optical device having a spectacle lens capable of performing viewpoint detection and the like without interrupting the user's field of view while the user is wearing spectacles, spectacles using the same, and spectacle-type display Relates to the device.

  The following patent documents disclose inventions related to display devices such as a head-mounted display. The head-mounted display is a glasses-type display device that is attached to the user's head and displays an image in front of the eyes.

  In addition, products having an optical system capable of photographing the pupils of eyeglass users have been developed. In these optical systems, an optical mechanism in which a beam splitter, a mirror, or the like that reflects some light is combined is configured. In such an optical mechanism, the beam splitter is arranged with an inclination of 45 ° from the optical design.

  As a result, there is a problem that the entire apparatus becomes large and the number of parts is large and the cost is increased.

  Thus, conventionally, there have been no smart glasses or glasses-type display devices having a function capable of directly photographing a pupil or displaying an image.

International Publication No. 2012/105500 Pamphlet International Publication No. 2010/064582 Pamphlet International Publication No. 2014/041871 Pamphlet JP 2013-187794 A

  The present invention has been made in view of such a point, and in particular, it is possible to acquire an image or display an image using a spectacle lens having a simple optical mechanism and a thin film thickness as compared with the conventional art. It is an object of the present invention to provide an optical device having a spectacle lens, spectacles using the same, and a spectacle-type display device.

  The present invention is an optical device having a spectacle lens provided with a light reflection layer, wherein the light reflection layer is transparent, and the light reflection layer is at an angle of 0 ° with respect to the optical axis orthogonal direction of the spectacle lens. Image light reflected by the light reflecting layer obliquely with respect to the optical axis direction and / or the image light directed toward the spectacle lens. An image light functional unit for outputting in an oblique direction with respect to the direction is provided.

  According to the present invention, the light reflecting layer is disposed with an inclination greater than 0 ° and smaller than 30 ° with respect to the direction perpendicular to the optical axis. Thereby, regular reflection can be prevented and the light emission angle can be made smaller than the total reflection critical angle.

  In the present invention, the image light function unit can acquire image light reflected obliquely with respect to the optical axis direction by the light reflection layer, or output image light projected obliquely in the optical axis direction. In particular, it is possible to achieve this with a thin spectacle lens and a simple optical mechanism.

  In the present invention, the light reflecting layer is preferably a polarizing layer. At this time, it is preferable that a polarizing plate is disposed between the spectacle lens and the image light functional unit, and the polarizing transmission axes of the polarizing layer and the polarizing plate are orthogonal to each other. Thereby, an image with high contrast can be acquired or an image with high contrast can be displayed.

  In the present invention, the polarizing layer is preferably a wire grid polarizer or a polarizer in which thin films having different birefringence are laminated.

  Alternatively, in the present invention, the light reflection layer has wavelength selectivity, and has, for example, a configuration having at least one reflection characteristic of RGB reflection characteristics, near infrared reflection characteristics, and infrared reflection characteristics. May be.

  In the present invention, the spectacle lens includes a pair of transparent base materials, the light reflecting layer disposed between the pair of transparent base materials, and a transparent adhesive resin filling between the pair of transparent base materials, It is preferable to have a configuration. Thereby, the spectacle lens can be thinned.

  Moreover, in this invention, it is preferable that the said some light reflection layer is arrange | positioned discontinuously. Thereby, multiple reflection can be suppressed and an image excellent in visibility can be acquired or an image can be displayed.

  In the present invention, it is further preferable that the absorption-type polarizing layer is disposed on the light incident side of external light. Thereby, the multiple reflection of external light can be improved.

  In addition, the present invention is a pair of glasses having any one of the above-described optical devices, and includes an image sensor as the image light functional unit that captures a pupil image of a user.

  Thereby, a pupil image can be image | photographed, ensuring the visibility through spectacles. That is, since the pupil image can be acquired as a reflection image in an oblique direction, the imaging element can be disposed at the lateral rear position of the spectacle lens. Therefore, when the user wears spectacles, the pupil image can be appropriately acquired by the image sensor without losing the front visibility through the spectacles, and analysis based on the pupil image can be performed.

  In this invention, it is preferable to provide the illumination part for illuminating the pupil periphery further through the said light reflection layer. Thereby, a pupil image can be appropriately obtained. In the present invention, the light reflection layer is a polarizing layer, and is between the image sensor and the spectacle lens, between the illumination unit and the spectacle lens, or between the image sensor and the spectacle lens. It is preferable that a polarizing plate having a polarization transmission axis orthogonal to the polarization transmission axis of the polarizing layer is disposed between the illumination unit and the spectacle lens.

  In the present invention, it is preferable that an external imaging device for imaging the outside world is further provided, and viewpoint detection can be performed based on the external image captured by the external imaging device and the pupil image.

  According to another aspect of the present invention, there is provided a glasses-type display device including the optical device according to any one of the above, and the projector as the image light functional unit for displaying an image in front of a user's eyes. To do. Thereby, an image can be displayed in front of the user's eyes with a thin spectacle lens and a simple optical mechanism.

  In the present invention, it is preferable to further include an imaging device as the image light functional unit that captures a user's pupil image, and an illumination unit for illuminating the periphery of the pupil through the light reflection layer. For example, in a state in which an image is displayed in front of the user's eyes by a projection device, the viewpoint is detected by observing the pupil image of the user with an image sensor, so that the image can be moved in accordance with the movement of the eye. It is possible to perform a predetermined operation without using a hand, such as giving a predetermined instruction to the user.

  According to the present invention, an optical device having a spectacle lens capable of acquiring an image or displaying an image using a spectacle lens having a simple optical mechanism and a thin film thickness as compared with the prior art, and the same are used. Eyeglasses, and a glasses-type display device can be provided.

It is a schematic diagram (cross-sectional view) of the spectacle lens according to the present embodiment. It is a schematic diagram (perspective view) for demonstrating the optical mechanism using the spectacle lens which concerns on this Embodiment. It is a photograph at the time of conducting an experiment using the optical mechanism shown in FIG. 2A or 2B. It is a schematic diagram of each photograph shown in FIG. It is a schematic diagram (perspective view) of the glasses showing the first embodiment. It is a schematic diagram (perspective view) of glasses showing a second embodiment. It is a schematic diagram (perspective view) of a glasses-type display device showing a third embodiment. It is a schematic diagram (sectional drawing) for demonstrating the optical mechanism of the spectacles of 1st Embodiment. It is a schematic diagram (sectional drawing) for demonstrating the optical mechanism of the spectacles of 2nd Embodiment. It is a schematic diagram (sectional drawing) for demonstrating the optical mechanism of the spectacles of 3rd Embodiment. FIG. 11A is a cross-sectional view of a wire grid polarizer, and FIG. 11B is a schematic plan view of the wire grid polarizer. It is process drawing (schematic diagram) for demonstrating the manufacturing process of the spectacle lens which concerns on this Embodiment. FIG. 13 is a process diagram (schematic diagram) performed subsequent to FIG. 12.

  It is a schematic diagram (cross-sectional view) of the spectacle lens according to the present embodiment. As shown in FIG. 1, the spectacle lens 1 includes a pair of transparent base materials 2 and 3, a light reflection layer 4 interposed between the transparent base materials 2 and 3, and a transparent adhesive filling the space between the transparent base materials 2 and 3. And a resin 5.

  The transparent base materials 2 and 3 are plate-shaped formed with a predetermined thickness, and specifically, are formed with a thickness of about 25 μm to 1000 μm.

  In this Embodiment, the material of the transparent base materials 2 and 3 is not limited. For example, as the transparent substrates 2 and 3, plastic lenses such as polycarbonate resin (PC), inorganic glass, or the like can be used. However, when the curved surface is formed as the spectacle lens 1, it is preferable to use a resin (plastic) for the transparent base materials 2 and 3. The total light transmittance in the transparent substrates 2 and 3 is preferably 80% or more, and more preferably 90% or more.

  As shown in FIG. 1, the light reflecting layer 4 is disposed obliquely with respect to the XY plane. Here, the Z direction orthogonal to the XY plane indicates the optical axis direction O of the spectacle lens 1. Here, the “optical axis” refers to a virtual light beam at the center in the width direction that is representative of the light beam passing through the lens, and connects, for example, the center of curvature of the object-side outer surface and the eye-side inner surface of the spectacle lens 1. It is a straight line. In the schematic diagram shown in FIG. 1, the outer surface on the outer world side and the inner surface on the eye side are each shown as a plane parallel to the XY plane, but in reality, the outer surface side and the eye side are curved surfaces having spherical or aspherical surfaces. Consists of a convex lens or a concave lens.

  As shown in FIG. 1, the light reflecting layer 4 is inclined with respect to a direction orthogonal to the optical axis direction O (X: optical axis orthogonal direction) at an inclination angle θ1 greater than 0 ° and smaller than 30 °. .

  As shown in FIG. 1, a plurality of light reflecting layers 4 are discontinuously arranged. Here, “discontinuously arranged” refers to a state in which the light reflecting layers 4 are not in contact with each other and their end portions are arranged apart from each other. As shown in FIG. 1, each light reflecting layer 4 does not overlap in a direction parallel to the optical axis direction O. Each of the light reflecting layers 4 is inclinedly arranged at an inclination angle θ1 that is greater than 0 ° and smaller than 30 ° with respect to the optical axis orthogonal direction (X). Each of the light reflecting layers 4 is disposed at substantially the same inclination angle θ1. In addition, it is possible to change the tilt angle of each light reflecting layer 4 depending on the location in terms of optical design. For example, the light reflecting layer 4 can be arranged at a gentle inclination angle toward the end of the spectacle lens 1 or the light reflecting layer 4 can be arranged so that the inclination becomes steep.

  The light reflecting layer 4 is, for example, a polarizing layer. As the polarizing layer, a polarizer in which thin films having different birefringence are laminated, a wire grid polarizer, or the like can be used. For a polarizer in which thin films having different birefringence are laminated, multilayer birefringent films APF, DBEF, etc. manufactured by 3M can be used. As the wire grid polarizer, there is a wire grid polarizing film manufactured by Asahi Kasei E-Materials Co., Ltd.

  The light reflecting layer 4 shown in FIG. 1 preferably has high transparency. When the light reflecting layer 4 is a polarizing layer, the transmittance (visible light) is preferably 30% or more, and the reflectance is 15% or more. It is preferable that

  The wire grid polarizer will be described. FIG. 11A is a cross-sectional view of a wire grid polarizer (wire grid polarizing film) according to the present embodiment.

  The wire grid polarizer 20 includes a holding base material (base film) 21 and a resin base material 22 provided on the surface 21 a of the holding base material 21.

  As shown in FIG. 11A, a plurality of lattice-shaped convex portions 23 are provided on the base material surface 22 a of the resin base material 22. As shown in FIG. 11A, the resin base material 22 is formed by integrally forming a base material layer 24 having a predetermined thickness and a grid-like convex portion 23.

  The holding substrate 21 is preferably a triacetyl cellulose (TAC) film, a polycarbonate film, a COP, PET, PEN, PS, PE, acrylic, or polyimide-based highly permeable film. Examples of the resin base material 22 include polymethyl methacrylate resin, polycarbonate resin, polystyrene resin, cycloolefin polymer resin, cross-linked polyethylene resin, polyvinyl chloride resin, polyacrylate resin, polyphenylene ether resin, modified polyphenylene ether resin, and polyetherimide. Amorphous thermoplastic resins such as resin, polyethersulfone resin, polysulfone resin, polyetherketone resin, polyethylene terephthalate resin, polyethylene naphthalate resin, polyethylene resin, polypropylene resin, polybutylene terephthalate resin, aromatic polyester resin, Crystalline thermoplastic resins such as polyacetal resin and polyamide resin, and ultraviolet (UV) curable resins and thermosetting resins such as acrylic, epoxy, and urethane It is below.

  As shown in FIG. 11A, a metal layer (metal wire) 27 is formed on at least a part of the surface of each grid-like convex portion 23 via a dielectric layer 26. The dielectric layer 26 may not be formed. In such a case, the metal layer 27 is formed directly on the surface of the grid-like convex portion 23.

  The dielectric constituting the dielectric layer 26 may be substantially transparent in the visible region. A dielectric material having high adhesion between the material constituting the resin base material 22 and the metal constituting the metal layer 27 can be suitably used. For example, silicon (Si) oxides, nitrides, halides, carbides or their composites (dielectrics in which other elements, simple substances, or compounds are mixed in a dielectric), aluminum (Al), chromium ( Cr), yttrium (Y), zirconium (Zr), tantalum (Ta), titanium (Ti), barium (Ba), indium (In), tin (Sn), zinc (Zn), magnesium (Mg), calcium ( A simple substance of a metal oxide such as Ca), cerium (Ce), copper (Cu), nitride, halide, carbide, or a composite thereof can be used.

  The metal constituting the metal layer (metal wire) 27 preferably has a high light reflectance in the visible light region and high adhesion to the material constituting the dielectric layer 26. For example, it is preferably composed of aluminum (Al), silver (Ag), or an alloy thereof. From the viewpoint of cost, it is more preferable to be made of aluminum or an alloy thereof.

  FIG. 11B is a schematic plan view of the wire grid polarizer according to the present embodiment. A plurality of horizontal lines illustrated in FIG. 11B indicate the extending direction of the metal layer (metal wire) 27 illustrated in FIG. 11A.

  As shown in FIG. 11B, the direction orthogonal to the extending direction of the metal layer 27 is the direction of the polarization transmission axis 20a.

  As shown in FIG. 11A, an adhesive layer or adhesive layer 29 for the purpose of improving the adhesion between the holding substrate 21 and the resin substrate 22 and adjusting the refractive index may be interposed. For example, a dielectric layer such as silica or alumina may be formed between the holding base material 21 and the resin base material 22 with a thin film thickness, or the surface 21a of the holding base material 21 may be subjected to corona discharge treatment, It may be a denatured layer such as imparting functional groups or imparting fine irregularities by performing atmospheric pressure plasma treatment, vacuum plasma treatment, or ultraviolet treatment.

  Although the thickness of the wire grid polarizer 20 is not particularly limited, it is, for example, about 50 μm to 200 μm. Moreover, the thickness of the wire grid polarizer 20 can be reduced to about 0.5 μm to 50 μm by separating the holding base material 21 and forming the wire grid polarizer 20 with the resin base material 22 and the metal layer 27. . As a result, the pitch P (see FIG. 1) of the light reflecting layer 4 can be made small and the inclination angle θ1 can be made shallow, so that a thinner wall can be realized and a film can be formed. Therefore, it is also possible to use a film material in which the light reflection layer 4 is inclined and is attached to a spectacle lens.

  Alternatively, the light reflecting layer 4 can be configured to have wavelength selectivity. At this time, the light reflection layer 4 preferably has at least one kind of reflection characteristic of RGB reflection characteristic, near infrared reflection characteristic, and infrared reflection characteristic. In such a case, the transmittance of the light reflecting layer 4 is preferably 50% or more, and the reflectance is preferably 15% or more.

  For example, an existing wavelength selective film can be used. As an example, “Refle Shine” (registered trademark, the same applies hereinafter) manufactured by Tokai Rubber Industries, Ltd., which is used as a heat-shielding and heat-insulating film for windows, is used as the light reflecting layer 4 Can be used as “Refle Shine” allows visible light to pass through but reflects near infrared rays. In addition, an RGB reflector can be formed using cholesteric liquid crystal. As the light reflection layer 4 having RGB reflection characteristics, “WAVISSTA” manufactured by Fuji Film Co., Ltd. can be used.

  The light reflecting layer 4 may be a laminated structure of a plurality of reflecting layers instead of a single layer. As an example, by laminating a DBEF having polarization in the visible light wavelength region and a reflective film having a reflection function in the near infrared wavelength region, it reflects polarized light in the visible light region and has no polarization in the near infrared region. The light reflecting layer 4 can be obtained.

  In the case of a wire grid polarizer, it has transmitted and reflected polarized light in a wide wavelength range from the visible light wavelength to the near infrared wavelength region.

  For the transparent adhesive resin 5 shown in FIG. 1, it is preferable to use a transparent adhesive having excellent affinity between the transparent substrates 2 and 3. The transparent adhesive resin 5 can be formed from a thermosetting or ultraviolet curable resin, but it is preferable to use an ultraviolet curable adhesive from the viewpoint of a short curing time.

  The total light transmittance in the transparent adhesive resin 5 is preferably 80% or more, and more preferably 90% or more.

  The refractive index difference between the transparent substrates 2 and 3 and the transparent adhesive resin 5 is preferably about 0.01 to 0.1. Reflected light scattering at the interface between the transparent substrates 2 and 3 and the transparent adhesive resin 5 can be suppressed.

  For example, each of the transparent substrates 2 and 3 was formed of a polycarbonate resin having a thickness of 0.5 mm (refractive index = 1.58), and the light reflecting layer 4 was formed of a wire grid polarizer. A TAC film (refractive index n = 1.49) resin 22 (refractive index n = 1.51) forming a wire grid layer was used as a base material for wire grid polarization. The inclination angle θ1 of the light reflecting layer 4 was 15 °, the pitch P of each light reflecting layer 4 was 0.9 mm, and the prism height H1 was about 0.25 mm.

  A UV adhesive (Aronix (registered trademark) LCR0628A manufactured by Toa Gosei Co., Ltd.) (refractive index n = 1.5) was used for the transparent adhesive resin 5. The total thickness H2 of the spectacle lens 1 was about 1.4 mm.

  Under the above conditions, when the light L is incident from a direction parallel to the optical axis direction O and reflected by the light reflecting layer 4, the reflection angle θ2 of the reflected light is about 50 °. However, actually, the outer surface and the inner surface of the spectacle lens 1 are curved surfaces, and the reflection angle θ2 varies depending on the lens curved surface and the tilt angle θ1 of the light reflecting layer 4. By adjusting the inclination angle θ1 (0 ° <θ1 <30 °) of the lens curved surface or the light reflecting layer 4, the reflection angle θ2 can be controlled to about 30 ° to 60 °.

  In the present embodiment, the light reflecting layer 4 is arranged at an inclination angle θ1 that is greater than 0 ° and smaller than 30 ° with respect to the optical axis orthogonal direction (X). Thereby, as shown in FIG. 1, the light or image light (for example, pupil image) L which entered in the optical axis direction O does not reflect regularly. Moreover, the light emission angle (θ2 in FIG. 1) can be made smaller than the total reflection critical angle. As a result, the image light L is not confined in the spectacle lens, and the reflected light can be emitted outward from the spectacle lens in a direction inclined obliquely with respect to the optical axis direction.

  In addition, the present embodiment has an advantage that the spectacle lens 1 can be formed with a thin film thickness and a simple optical mechanism can be realized. In the spectacle lens 1, the light reflection layer 4 that is inclined obliquely is disposed between the pair of transparent substrates 2 and 3, and the inclination angle θ1 is within a range that is larger than 0 ° and smaller than 30 °. Therefore, the distance between the pair of transparent substrates 2 and 3 can be reduced. Further, since the eyeglass lens 1 is used, a pair of transparent base materials 2 and 3 for sandwiching the light reflecting layer 4 on both sides are required to obtain a predetermined strength. By forming 3, each transparent base material 2, 3 can maintain a predetermined strength with a thickness of about 1 mm or less. Further, a space other than the light reflection layer 4 may be filled with the transparent adhesive resin 5 between the pair of transparent substrates 2 and 3, and the film thickness of the transparent adhesive resin 5 can be reduced. For this reason, the total thickness H2 of the spectacle lens 1 can be formed thin, specifically, it can be formed with a thickness of about 0.3 mm to 2 mm.

  In addition, an optical device can be configured by arranging a light reflection layer 4 incorporated in the spectacle lens 1 and an image light functional unit such as an image sensor or a projector described later. A simple optical mechanism can be realized and the cost can be reduced.

  FIG. 2 is a schematic diagram (perspective view) for explaining an optical mechanism using the spectacle lens according to the present embodiment. FIG. 3 is a photograph of an experiment conducted using the optical mechanism shown in FIG. 2A or 2B. FIG. 4 is a schematic diagram of each photograph shown in FIG.

  2A and 2B, the spectacle lens 1 using a polarizing layer such as a wire grid polarizer for the light reflecting layer 4 (see FIG. 1) is used.

  As shown in FIG. 2A, a polarizing plate 6 is arranged on the near side of the spectacle lens 1 in the figure. Further, an “ABC” display plate is disposed over the spectacle lens 1 when viewed from the polarizing plate 6 side. Now, it is assumed that the polarization transmission axis 1a of the spectacle lens 1 is parallel to the X direction. On the other hand, when the polarization transmission axis 6a of the polarizing plate 6 is parallel to the polarization transmission axis 1a, the incident light L1 passes through the polarizing plate 6 and the spectacle lens 1. For this reason, when the observer is closer to the drawing than the polarizing plate 6, the display of “ABC” can be visually recognized through the eyes E of the observer (see FIGS. 3A and 4A).

  Next, when the polarizing plate 6 is rotated by 90 ° and the polarization transmission axis 6b of the polarizing plate 6 is orthogonal to the polarization transmission axis 1a, the incident light L2 is transmitted through the polarizing plate 6 but reflected by the spectacle lens 1. Therefore, the display of “ABC” cannot be visually recognized through the eyes E of the observer (see FIGS. 3B and 4B).

  Next, in FIG. 2B, a polarizing plate 7 and an “ABC” display plate are arranged on the back side of the spectacle lens 1 in the figure. Now, it is assumed that the polarization transmission axis 1a of the spectacle lens 1 is parallel to the X direction. On the other hand, when the polarization transmission axis 7a of the polarizing plate 6 is parallel to the polarization transmission axis 1a, the reflected light L3 reflected by the spectacle lens 1 is also reflected by the polarizing plate 7. For this reason, when the observer is behind the polarizing plate 7 in the drawing, the display of “ABC” cannot be visually recognized through the eyes E of the observer (see FIGS. 3C and 4C). At this time, the scenery through the spectacle lens 1 can be seen through.

  On the other hand, when the polarizing plate 7 is rotated by 90 ° and the polarization transmission axis 7b of the polarizing plate 7 is orthogonal to the polarization transmission axis 1a, the reflected light L4 reflected by the spectacle lens 1 is transmitted through the polarizing plate 7. Therefore, the display of “ABC” can be visually recognized through the eyes E of the observer (see FIGS. 3D and 4D). At this time, the scenery through the spectacle lens 1 cannot be seen through and can be visually recognized as a high-contrast image.

  However, as shown in FIG. 3D and FIG. 4D, “ABC” is displayed inverted. Therefore, it is preferable to process the captured image into any necessary image. However, when the obtained image display may be reversed, at least the optical mechanism of FIG. 2B is sufficient.

  When the light reflection layer 4 (see FIG. 1) is a polarizing layer, the polarization transmission axis 1a may be a transmission axis that transmits the P-polarized component or a transmission axis that transmits the S-polarized component. For example, assume that the polarization transmission axis 1a transmits P-polarized light and reflects S-polarized light. In this case, as shown in FIG. 2A, when the polarization transmission axes 1a and 6a of the spectacle lens 1 and the polarizing plate 6 are parallel, the P-polarized light is transmitted through both the spectacle lens 1 and the polarizing plate 6, and “ABC” The display is visible and transparent.

  As shown in FIG. 2B, when the polarization transmission axes 1a and 7b of the spectacle lens 1 and the polarizing plate 7 are orthogonal, the polarizing plate 7 transmits S-polarized light and reflects P-polarized light. Therefore, when the S-polarized light is reflected by the spectacle lens 1, the reflected light that is the S-polarized light is transmitted through the polarizing plate 7, so that the reverse display of “ABC” can be visually recognized. At this time, the P-polarized light is transmitted through the spectacle lens 1, and the P-polarized light that is not transmitted through the spectacle lens 1 is reflected by the polarizing plate 7, so that image light can be acquired with high contrast.

  Next, a specific application using the spectacle lens described in FIGS. 1 and 2 will be described. FIG. 5 is a schematic diagram (perspective view) of the glasses showing the first embodiment.

  As shown in FIG. 5, the spectacles 30 include a spectacle lens 1 and a frame 31 that supports the spectacle lens 1. As shown in FIG. 5, an eyeglass 30 has an inner surface 31a (a surface on the side facing the user) of a temple portion of a frame 31, an image sensor (image light functional unit) 32 such as a CCD camera or CMOS, and an eyeglass lens. And an illuminating unit 33 that irradiates illumination light toward 1.

  The illumination unit 33 has a configuration capable of diffusing illumination, pulsed light emission, or the like, but the illumination unit 33 is preferably, for example, near-infrared LED illumination so as not to affect the user with illumination light. Near-infrared illumination can illuminate the periphery of the pupil through the light reflection layer of the spectacle lens 1 without being dazzled, and a pupil image can be appropriately captured by the imaging element 32.

  As shown in FIG. 5, image light L <b> 5 including the pupil E <b> 1 of the user wearing the glasses 30 or the periphery of the pupil E <b> 1 is reflected by the eyeglass lens 1 and taken into the image sensor 32. Here, the “pupil image” includes both an image of only the pupil and an image including the pupil and the periphery of the pupil.

  FIG. 8 is a schematic diagram (cross-sectional view) for explaining the optical mechanism of the glasses according to the first embodiment. As shown in FIG. 8, the spectacle lens 1 has a light reflecting layer 4 built therein. As described with reference to FIG. 1, the light reflecting layer 4 is disposed with an inclination greater than 0 ° and smaller than 30 ° with respect to the direction perpendicular to the optical axis. FIG. 8 shows the spectacle lens 1 whose inner surface 1b and outer surface 1c are spherical or aspherical curved surfaces. In FIG. 8, the inclination angles of the respective light reflecting layers 4 are the same. However, in actuality, the inclination angles of the respective light reflecting layers 4 change according to the curvature of the lens. The same applies to FIGS. 9 and 10. For example, the spectacles 30 shown in FIG. 8 are polarized sunglasses, and assuming that the P-polarized light is transmitted by the light reflecting layer 4 and the S-polarized light is reflected, the S-polarized component of the image light L5 is reflected by the light reflecting layer 4. At this time, since the light reflecting layer 4 is arranged with an inclination larger than 0 ° and smaller than 30 ° with respect to the direction perpendicular to the optical axis, the light reflecting layer 4 is not regularly reflected, and the reflected light of the image light L5 is directed to the user's eyes. I won't come back. Further, since the incident angle can be made smaller than the critical angle, the image light L5 reflected by the spectacle lens 1 is not confined in the spectacle lens 1, and the image light L5 reflected obliquely is emitted to the outside of the spectacle lens 1. The image light L5 reflected obliquely is incident on the image sensor 32 disposed on the reflected light path, and the image light L5 can be acquired by the image sensor 32.

  On the other hand, as viewed from the user side (inner surface 1b side), the P-polarized light component is transmitted, so that the user can visually recognize the front scenery through the spectacle lens 1.

  In order to improve the multiple reflection of external light, it is preferable to dispose the absorption-type polarizing layer 37 on the external light incident side (external surface 1c side). At this time, the transmission axis of the absorptive polarizing layer 37 coincides with that of the light reflecting layer 4 (see the description of FIG. 2A). FIG. 1 shows multiple reflection lines when the absorption-type polarizing layer 37 is not provided. On the other hand, when the absorption-type polarizing layer 37 (P-polarized component is transmitted and S-polarized component is absorbed), the S-polarized component as the reflected light of the P-polarized component and the S-polarized component is reflected on the spectacle lens 1. Can be absorbed in front. Further, in order to suppress the influence of external light entering from the side of the spectacles 30 when the spectacles 30 are worn, the absorbing polarizing layer 37 on the inner surface 1b side within a range where the reflected light of the image light L5 can be appropriately obtained. (Ultra high transmission absorption type) can also be arranged. Alternatively, when the glasses 30 are not polarized sunglasses, an absorption polarizing layer 37 can be provided over the entire inner surface 1b to absorb either the S-polarized component or the P-polarized component. If the absorbing polarizing layer 37 is in the form of a film, it can be appropriately bonded to the surface of the spectacle lens 1. Further, the absorption polarizing layer 37 can be disposed inside the spectacle lens 1.

  As shown in FIG. 8, a polarizing plate 34 is disposed between the image sensor 32 and the spectacle lens 1. The polarizing plate 34 has a polarization transmission axis orthogonal to the polarization transmission axis of the light reflection layer 4 (see the description of FIG. 2B). As a result, the high-contrast image light L5 can be taken into the image sensor 32. The polarizing plate 34 is also preferably disposed between the illumination unit 33 (see FIG. 5) and the spectacle lens 1. The polarizing plate 34 disposed between the illumination unit 33 and the spectacle lens 1 also has a polarization transmission axis orthogonal to the polarization transmission axis of the spectacle lens 1. Thereby, specular reflection light can be cut, local halation due to illumination can be eliminated, and an accurate image can be acquired.

  The eyeglasses 30 shown in FIG. 5 have excellent visibility because their own pupil image does not appear in front of the user. On the other hand, the pupil image is reflected obliquely to the image sensor 32 arranged on the reflection path. It is possible to perform various analysis processes based on the captured pupil image. For example, it is possible to detect a user's viewpoint change, health condition (vital sensing), and the like from the pupil image.

  In FIG. 5, only one pupil can be imaged. However, the imaging element 32 and the illumination unit 33 can be arranged in the temple portions on both sides of the frame 31 so as to image the pupils of both eyes. Also in FIGS. 6 and 7 to be described later, the image light function unit and the illumination unit can be arranged with respect to both eyes.

  FIG. 6 is a schematic diagram (perspective view) of eyeglasses showing the second embodiment. FIG. 9 is a schematic diagram (cross-sectional view) for explaining the optical mechanism of the glasses of the second embodiment. 6 and 9, the same reference numerals as those in FIGS. 5 and 8 denote the same members.

  In FIG. 6, an image sensor 35 for the outside world is provided. The image sensor 35 for the outside world can be disposed on the outer surface of the frame 31, for example, at a position between the spectacle lenses 1.

  A scene in front of the glasses 30 is photographed by the image sensor 35 for the outside world, and the image is transmitted to the control unit 36 (see FIG. 9). On the other hand, as described with reference to FIGS. 5 and 8, the imaging element 32 acquires a pupil image and transmits it to the control unit 36. As shown in FIG. 6, the control unit 36 can detect the viewpoints 41 and 42 in the external image 40 by matching the obtained pupil image and the external image based on a predetermined method. Note that viewpoints 41 and 42 shown in FIG. 6 indicate changes in viewpoint over time.

  The outside image 40 does not have to be an image of the outside world itself, and can be an image obtained by extracting only a predetermined portion, an image processed based on predetermined chromaticity, saturation, or the like.

  The viewpoint change in the external image 40 can be obtained through mapping and initialization of the external image 40. With the glasses 30 shown in FIG. 6, for example, a change in viewpoint can be detected by driving a car, and driving safety can be improved based on the relationship between the external image 40 and the viewpoint.

  FIG. 7 is a schematic view (perspective view) of a glasses-type display device showing a third embodiment. FIG. 10 is a schematic diagram (cross-sectional view) for explaining the optical mechanism of the glasses of the third embodiment. Parts having the same reference numerals as those in FIGS. 5, 6, 8, and 9 indicate the same members as those in the drawings.

  FIG. 7 shows a head mounted display (glasses type display device) 44. As shown in FIG. 7, a projector (projection device) 45 is disposed on the inner surface 31 a of the temple portion of the frame 31. As shown in FIG. 7, the projector 45 is disposed at a position inclined with respect to the optical axis direction and on a reflected light path through the light reflecting layer 4 (see FIG. 1 and the like). For this reason, since the image light L6 emitted from the projector 45 is reflected by the light reflecting layer 4 of the spectacle lens 1, the user wearing the head mounted display 44 sees the image projected by the projector 45. Can do. At this time, the image light L6 reflected by the light reflecting layer 4 can be emitted in a direction parallel to the optical axis direction.

  In FIG. 7, the image sensor 32 and the illumination unit 33 described with reference to FIG. 5 are arranged on the inner surface 31 a of the temple portion of the frame 31.

  As shown in FIG. 10, an image of the pupil E <b> 1 can be acquired by the image sensor 32. In the control unit 42 shown in FIG. 10, the pupil image acquired by the image sensor 32 and the display image from the projector 45 (see FIG. 7) are matched to detect the pupil position in the display image. it can. Accordingly, predetermined processing, instructions, and the like can be performed on the display image based on the viewpoint position. For example, the display image is a keyboard, and characters can be input based on the movement of the viewpoint. Alternatively, the display image is a game image, and the game can be advanced based on the movement of the viewpoint. As described above, it is possible to perform a predetermined operation without using a hand, such as moving an image in accordance with the movement of the eyes or giving a predetermined instruction in the image.

  Further, for example, when the P-polarized light absorbing layer 43 is disposed on the outer surface 1c of the spectacle lens 1 and the light reflecting layer 4 transmits P-polarized light, the polarization transmission axes are orthogonally arranged so that the outside world cannot be seen. As described above, when it is desired to make the outside world invisible and to visually recognize the image with a good contrast, it is preferable to dispose the P-polarized light absorption layer 43 on the outer surface 1c of the spectacle lens 1. The P-polarized light absorbing layer 43 is preferably removable.

  When using LCOS or LCD as a projection device and projecting an image using a polarizing layer as a light reflecting layer, an image with good contrast can be obtained by giving the image light polarized light orthogonal to the polarization transmission axis of the polarizing layer. it can.

  Further, when a DLP projection apparatus is used, the image light has no polarization, and therefore, for example, an RGB wavelength selective reflection layer can be used.

  FIG. 12 is a process diagram (schematic diagram) for explaining a manufacturing process of the spectacle lens according to the present embodiment. FIG. 13 is a process diagram (schematic diagram) performed after FIG.

  In FIG. 12A, for example, the light reflecting layer 4 is bonded to one surface of a flat substrate 50 formed of polymethyl methacrylate resin (PMMA) via an adhesive layer (not shown). The adhesive layer is preferably a slightly adhesive layer having adhesion and peelability.

  In the step of FIG. 12B, a mold 54 is prepared in which a plurality of inclined surfaces 52 are continuously formed on the surface via a vertical surface 53. The inclination angle θ3 of the inclined surface 52 is set in a range larger than 0 ° and smaller than 30 ° with respect to the XY plane. The mold 54 is made of Ni, for example.

  As shown in FIG. 12B, the side of the substrate 50 on which the light reflecting layer 4 is provided is opposed to the side of the mold 54 on which the inclined surface 52 is provided. Then, vacuum hot pressing is performed.

  As shown in FIG. 12C, the light reflecting layer 4 provided on the base material 50 is formed at the edge portion 54a of the inclined surface 52 of the mold 54 (the edge portion between the inclined surface 52 and the vertical surface 53) by vacuum hot pressing. The base material 50 enters (flows) into the space between the inclined surface 52 and the vertical surface 53 of the mold 54 while being cut. The light reflecting layer 4 is provided only on the inclined surface 52 and is not provided on the vertical surface 53.

  Then, the mold 54 is removed. As a result, as shown in FIG. 12D, the substrate 55 with the light reflecting layer in which the light reflecting layer 4 is arranged on the inclined surface 52 of the substrate 50 having the inclination angle θ3 larger than 0 ° and smaller than 30 ° is obtained. be able to. In FIG. 12D, FIG. 12C is shown inverted.

  Next, as shown in FIG. 12E, the transparent substrate 2 is opposed to the side where the light reflecting layer 4 of the substrate 50 is disposed through the transparent adhesive resin 5, and the substrate 50 and the transparent substrate 2 are separated. The space is joined through the transparent adhesive resin 5 (see FIG. 13A). It is preferable to use a UV adhesive for the transparent adhesive resin 5. When a UV adhesive is used for the transparent adhesive resin 5, the transparent adhesive resin 5 can be cured by UV irradiation in the state of FIG. 13A.

  Next, in the step of FIG. 13B, the base material 50 is removed. In FIG. 13B, FIG. 13A is shown inverted. Since the adhesive layer interposed between the base material 50 and the light reflecting layer 4 is a slightly adhesive layer, the base material 50 can be appropriately removed.

  Then, the same process as that shown in FIG. 12E is also performed on the light reflection layer 4 exposed in FIG. 13B, so that the pair of transparent base materials 2 and 3 and the transparent base material 2 as shown in FIG. 13C. 3, a spectacle lens having a light reflecting layer 4 having an inclination angle larger than 0 ° and smaller than 30 °, and a transparent adhesive resin 5 filling a space between the transparent base materials 2 and 3. One base substrate can be manufactured. In the case of making a spectacle lens, a curvature can be added to the lens shape by vacuum forming using a mold having a desired curvature if necessary.

  As shown in FIG. 1, based on the above manufacturing method, the light reflecting layer 4 can be discontinuously arranged. That is, as shown in FIG. 12C, the light reflecting layer 4 is cut into a plurality of pieces and is not disposed on the vertical surface 53. If the light reflection layer 4 is also disposed on the vertical surface 53, the light reflection layer 4 is continuously disposed, and the light that has entered the spectacle lens 1 causes irregular reflection at the light reflection layer 4 disposed on the vertical surface 53. Therefore, as shown in FIG. 13C, the multiple light reflection layers 4 arranged at an inclination angle larger than 0 ° and smaller than 30 ° are discontinuously arranged to suppress multiple reflection of light. Can do.

  Hereinafter, the present invention will be described in more detail based on examples carried out to clarify the effects of the present invention. In addition, the structure in the following Example is an illustration and can be implemented changing suitably. Other modifications can be made without departing from the scope of the present invention. Therefore, the present invention is not limited at all by the following examples.

[Example 1]
Experiments were performed using the optical mechanism shown in FIG. 2B. A wire grid polarizer was used for the light reflecting layer. The light reflection layer has transmitted and reflected polarized light in a wide wavelength range from a visible light wavelength to a near infrared wavelength range (400 to 1600 nm). Moreover, the average transmittance of the spectacle lens was 35%, and the average reflectance was 35%. The lens curvature was 130 mm.

  In the experiment, the polarization transmission axis of the polarizing plate 7 shown in FIG. 2B was orthogonal to the polarization transmission axis of the light reflection layer. Then, when a camera was installed at the position of pupil E in FIG. 2B and taken, ABC characters (inverted image) could be taken as shown in FIG. 3D.

[Example 2]
An absorptive polarizing plate was disposed on the convex surface side of the spectacle lens of Example 1 so as to coincide with the polarization transmission axis of the light reflecting layer. The average transmittance of the spectacle lens was 32%, and the reflectance was 35%.

  Since the reflected light of the external light reflection layer is absorbed by the absorption type polarizing plate, the multiple reflection in the spectacle lens is reduced, and a clearer field of view is obtained.

[Example 3]
As the light reflecting layer, “Refle Shine” which is a near infrared reflecting film manufactured by Tokai Rubber Industries, Ltd. was used. The average transmittance in the visible light region (400-750 nm) was 70%, and the average reflectance in the near-infrared light region (800-1600 nm) was about 30%.

  It was found that the image can be acquired even by infrared reflection, although the contrast of the image is somewhat lower than that of Example 1 using the wire grid polarizer.

  The optical device of the present invention can be applied to eyeglasses (including sunglasses) and eyeglass-type display devices. As a pair of spectacles, the present invention can be applied to driving a vehicle, vital sensing, etc. in addition to a general usage pattern. Further, it can be applied as a head-mounted display, and it is possible to perform processing, instructions, etc. on a display image without using a hand.

DESCRIPTION OF SYMBOLS 1 Eyeglass lens 1a, 6a, 6b, 7a, 7b Polarization transmission axis 2, 3 Transparent base material 4 Light reflection layer 5 Transparent adhesive resin 6, 7, 34 Polarizing plate 20 Wire grid polarizer 21 Holding base material 22 Resin base material 23 Lattice-shaped convex part 27 Metal layer 30 Glasses 31 Frame 32 Imaging element 33 Illumination part 35 External imaging element 36, 42 Control part 37 Absorption-type polarizing layer 40 External field image 43 P-polarized light absorption layer 44 Head-mounted display 45 Projector 50 Base material 52 Inclined surface 53 Vertical surface 54 Mold

The present invention is an optical device having a spectacle lens including a light reflecting layer, wherein the light reflecting layer is a polarizing layer that transmits one of P-polarized light and S-polarized light and reflects the other. The reflective layer has an inclination greater than 0 ° and smaller than 30 ° with respect to the optical axis orthogonal direction of the spectacle lens, and the visible light transmittance of the light reflective layer is 30% or more, The reflectance is 15% or more, and the plurality of light reflecting layers are arranged in contact with each other without being in contact with each other, and are reflected obliquely with respect to the optical axis direction by the light reflecting layer. An image light function unit is provided for acquiring the image light and / or outputting the image light toward the spectacle lens in an oblique direction with respect to the optical axis direction.

In the present invention, the image light function unit can acquire image light reflected obliquely with respect to the optical axis direction by the light reflection layer, or output image light projected obliquely in the optical axis direction. In particular, it is possible to achieve this with a thin spectacle lens and a simple optical mechanism. In addition, multiple reflections can be suppressed, and an image with excellent visibility can be acquired or displayed.

In the present invention, when this, it is preferable polarizing plates are arranged, in which the polarization transmission axis of the polarizing plate and the polarizing layer is orthogonal between the eyeglass lens and the image optical functional unit . Thereby, an image with high contrast can be acquired or an image with high contrast can be displayed.

In the present invention, the polarizing layer is preferably a wire grid polarization element.

Claims (15)

An optical device having a spectacle lens with a light reflecting layer,
The light reflecting layer is transparent;
The light reflecting layer has an inclination greater than 0 ° and smaller than 30 ° with respect to the optical axis orthogonal direction of the spectacle lens;
Image light function for acquiring image light reflected obliquely with respect to the optical axis direction by the light reflecting layer and / or outputting the image light toward the spectacle lens in an oblique direction with respect to the optical axis direction An optical device having a spectacle lens, wherein a portion is provided.   The optical device having a spectacle lens according to claim 1, wherein the light reflecting layer is a polarizing layer.   The spectacles according to claim 2, wherein a polarizing plate is disposed between the spectacle lens and the image light functional unit, and a polarizing transmission axis of the polarizing layer and the polarizing plate is orthogonal to each other. An optical device having a lens.   The optical device having a spectacle lens according to claim 2 or 3, wherein the polarizing layer is a wire grid polarizer or a polarizer in which thin films having different birefringence are laminated.   2. The optical device having a spectacle lens according to claim 1, wherein the light reflecting layer has wavelength selectivity.   6. The optical device having a spectacle lens according to claim 5, wherein the light reflection layer has at least one reflection characteristic of RGB reflection characteristics, near infrared reflection characteristics, and infrared reflection characteristics.   The spectacle lens includes a pair of transparent base materials, the light reflecting layer disposed between the pair of transparent base materials, and a transparent adhesive resin filling between the pair of transparent base materials. An optical device having a spectacle lens according to any one of claims 1 to 6.   The optical device having a spectacle lens according to claim 1, wherein the plurality of light reflecting layers are discontinuously arranged.   9. The optical apparatus having a spectacle lens according to claim 1, further comprising an absorptive polarizing layer disposed on a light incident side of external light. A pair of spectacles comprising the optical device according to claim 1.
Eyeglasses comprising an image sensor as the image light functional unit that captures a pupil image of a user.   The spectacles according to claim 10, further comprising an illuminating unit for illuminating a pupil periphery through the light reflecting layer.   The light reflection layer is a polarizing layer, and is between the image sensor and the spectacle lens, or between the illumination unit and the spectacle lens, or between the image sensor and the spectacle lens, and the illumination unit. The spectacles according to claim 10 or 11, wherein a polarizing plate having a polarization transmission axis perpendicular to the polarization transmission axis of the polarizing layer is disposed between the lens and the spectacle lens.   11. The camera according to claim 10, further comprising an imaging device for an outside world that photographs the outside world, wherein viewpoint detection is possible based on the outside image captured by the imaging device for the outside world and the pupil image. 12. The spectacles according to any one of 12. An eyeglass-type display device comprising the optical device according to claim 1,
An eyeglass-type display device comprising a projection device as the image light functional unit for displaying an image in front of a user's eyes.   The eyeglasses according to claim 14, further comprising: an imaging device as the image light functional unit that captures a pupil image of a user, and an illumination unit that illuminates the periphery of the pupil through the light reflection layer. Type display device.