JP6995169B2 - 3D image projection device - Google Patents

Description

The present invention relates to a projection device, and more particularly to a stereoscopic image projection device.

In the conventional stereoscopic image generation method, different images are mainly received by both eyes, the images are processed by the cerebrum, and then the images received by the left and right eyes are imaged to generate stereoscopic vision. Initially, achromatic glasses composed of red and blue lenses appeared, and after that, there was a problem that the exact color of the image could not be seen with achromatic glasses, so polarized glasses or liquid crystal shutter glasses were manufactured.

In recent years, projection devices capable of generating stereoscopic images without using glasses have appeared on the market (see FIGS. 1 and 2 of Patent Document 1). For example, Patent Document 1 below describes a directional reflection image and an image display device in which a mirror group 11 and a lens group 12 jointly form a reflection screen 10 (see FIG. 1).
FIG. 2 shows a cross-sectional view of the mirror group 11 of Patent Document 1 in the horizontal direction. The mirror group 11 has a fixed first reflecting surface 111 and a second reflecting surface 112, the first reflecting surface 111 has a first cutting edge angle θ1, and the second reflecting surface 112 has a second cutting edge angle. It has θ2. The first cutting edge angle θ1 and the second cutting edge angle θ2 are both in the range of 0 ° to 90 °, and the first cutting edge angle θ1 is smaller than the second cutting edge angle θ2. The lens group 12 is used to diffuse the image reflected from the mirror group 11 and increases the vertical range in which the stereoscopic image can be observed.

Due to the above-mentioned structure, the image of the left eye and the image of the right eye projected on the reflection screen 10 are reflected by the first reflection surface 111 and the second reflection surface 112 of the mirror group 11, diffused by the lens group 12, and the image of the left eye is the left eye. The image of the right eye is projected on the right eye. As a result, the observer receives different images with the left and right eyes, and achieves the effect of generating a stereoscopic image.

Japanese Patent No. 3526157

However, in the above-mentioned conventional technique, the above-mentioned reflection screen 10 is composed of two members, and when the reflection or the refraction angle is adjusted, the mirror group 11 or the lens group 12 must be manufactured again. It can be said that the structure has a low degree of freedom in directivity. In view of the above, it is necessary to solve the above-mentioned defects by a new technical method.

The present inventor considers that the above-mentioned drawbacks can be improved, and as a result of repeated diligent studies, he / she has come up with a proposal of the present invention for effectively improving the above-mentioned problems with a rational design.

The present invention has been made in view of these circumstances, and an object of the present invention is to provide a stereoscopic image projection device having a higher degree of freedom in directivity.

A stereoscopic image projection device according to an aspect of the present invention for solving the above problems includes a projection module that alternately projects first image light and second image light, and a path between the first image light and the second image light. The first image light and the second image light are converted into the first polarized image light and the second polarized image light, and the first polarized image light and the second polarized image light are polarized in different directions. An ultrafast polarization modulator, which is a light beam that is perpendicular to each other, is installed on the path of the first polarized image light and the second polarized image light, and reflects the first polarized image light and the second polarized image light. And the second polarized light transmitted by the polarizing element, which is installed on the path of the first polarized image light reflected by the polarizing element and reflects the first polarized image light. The reflector module installed on the path of the polarized image light and reflecting the second polarized image light, the first polarized image light reflected by the reflector module, and the second polarized image light are received and received. A reflective diffuser having a plurality of array-shaped microcurve mirrors that diffuses the first polarized image light into the first light receiving range and diffuses the second polarized image light into the second light receiving range. There is.

In a preferred example of the present invention, when the first image light is converted into the first polarized image light, the second image light is converted into the second polarized image light.

In a preferred example of the present invention, when the first image light is converted into the second polarized image light, the second image light is converted into the first polarized image light.

In a preferred embodiment of the present invention, the splitter is a reflective splitter or a polarizing beam splitter.

In a preferred embodiment of the present invention, a windshield is further provided. The microcurve mirror diffuses the first polarized image light to the front glass and then reflects it to the first light receiving range, diffuses the second polarized image light to the front glass, and then receives the second light. Reflects in the range.

In a preferred embodiment of the present invention, a quarter wave plate to be installed behind the polarizing element is further provided. The first polarized image light and the second polarized image light pass through the quarter wave plate and are converted into circularly polarized light or elliptically polarized light.

In a preferred embodiment of the present invention, the concave mirror installed between the windshield and the reflective diffuser is further provided.

In a preferred example of the present invention, the reflector module has a first reflector mirror group and a second reflector mirror group. The first reflector mirror group reflects the first polarized image light to the reflective diffuser, and the second reflector mirror group reflects the second polarized image light to the reflective diffuser.

Another aspect of the present invention for solving the above problems is a stereoscopic image projection device. This stereoscopic image projection device is installed on a projection module that alternately projects the first image light and the second image light, and on the path of the first image light and the second image light, and the first image light and the first image light. An ultrafast polarization modulator that converts the second image light into first polarized image light and second polarized image light, and the first polarized image light and the second polarized image light are rays whose polarization directions are perpendicular to each other. With a decoder that is installed on the path of the first polarized image light and the second polarized image light, transmits the first polarized image light, and reflects the second polarized image light, and the deflector. A reflector module that is installed on the path of the first polarized image light to be transmitted and reflects the first polarized image light to transmit the polarizing element, and the first polarized image light reflected by the reflector module and the first polarized image light. The second polarized image light reflected by the polarizing element is received, the first polarized image light is diffused in the first light receiving range, and the second polarized image light is diffused in the second light receiving range. It is equipped with a reflective diffuser having a plurality of array-shaped microcurve mirrors.

In a preferred example of the present invention, when the first image light is converted into the first polarized image light, the second image light is converted into the second polarized image light.

In a preferred example of the present invention, when the first image light is converted into the second polarized image light, the second image light is converted into the first polarized image light.

In a preferred example of the present invention, the substituent is a reflective polarizing element.

In a preferred embodiment of the present invention, a windshield is further provided. The microcurve mirror diffuses the first polarized image light to the front glass and then reflects it to the first light receiving range, diffuses the second polarized image light to the front glass, and then receives the second light. Reflects in the range.

In a preferred example of the present invention, a quarter wave plate installed behind the polarizing element is further provided, and the first polarized image light and the second polarized image light pass through the quarter wave plate. Converts to circular or elliptically polarized light.

In a preferred embodiment of the present invention, the concave mirror installed between the windshield and the reflective diffuser is further provided.

In a preferred example of the present invention, the microcurve mirror is a concave mirror or a convex mirror.

In a preferred embodiment of the invention, the reflective diffuser has a curved or planar base, and each microcurve mirror is mounted on the base.

In a preferred example of the present invention, the number of the microcurve mirrors is plural, and each of the microcurve mirrors is arranged in a square array or a honeycomb array.

In a preferred example of the present invention, the side length of the microcurve mirror is in the range of 25 μm to 0.25 mm.

Furthermore, yet another aspect of the present invention for solving the above object is a stereoscopic image projection device. This stereoscopic image projection device has a first projection module for projecting the first image light, a second projection module for projecting the second image light, and an array composed of a microcurve mirror group. The microcurve mirror includes a reflective diffuser that diffuses the first image light into the first light receiving range and diffuses the second image light into the second light receiving range.

In a preferred embodiment of the present invention, a windshield is further provided. The microcurve mirror diffuses the first polarized image light to the front glass and then reflects it to the first light receiving range, diffuses the second polarized image light to the front glass, and then receives the second light. Reflects in the range.

In a preferred embodiment of the present invention, the concave mirror installed between the windshield and the reflective diffuser is further provided.

In a preferred embodiment of the invention, the reflective diffuser has a curved or planar base, and each microcurve mirror is mounted on the base.

In a preferred example of the present invention, the number of the microcurve mirrors is plural, and each of the microcurve mirrors is arranged in a square array or a honeycomb array.

According to the present invention, there are the following effects.
The left eye receives the first polarized image light or the first image light, and the right eye receives the second polarized image light or the second image light to generate a stereoscopic image that can be seen by the naked eye without the user wearing anything. do. Further, each microcurve mirror of the present invention is manufactured so as to meet the reflection angle required based on the design, and the directivity of the reflection type diffuser has a very high degree of freedom.

The description of the present specification and the drawings will clarify at least the following matters.

It is an inclined view which shows the display screen of patent document 1. FIG. It is a cross-sectional view which shows the mirror group of Patent Document 1. FIG. It is a schematic diagram which shows the structure of 1st Embodiment of this invention. It is a schematic diagram which shows the switching of the ultrafast polarization modulator of this invention. It is a schematic diagram that the image light of this invention passes through a reflective polarizing element. It is a schematic diagram which arranges the microcurve mirror of this invention in a square array shape on the base. It is a schematic diagram which arranges the microcurve mirror of this invention in a honeycomb array shape on the base. It is a schematic diagram which shows the dimension of the microcurve mirror of this invention. It is a tilting block diagram which shows the different microcurve mirror of this invention. It is a schematic diagram which shows the structure of the 2nd Embodiment of this invention. It is a schematic diagram which shows the structure of the 3rd Embodiment of this invention. It is a schematic diagram which shows the structure of the 4th Embodiment of this invention. It is a schematic diagram which shows the structure of the 5th Embodiment of this invention. It is a schematic diagram which shows the structure of the 6th Embodiment of this invention. It is a schematic diagram which shows the structure of 7th Embodiment of this invention. It is a schematic diagram which shows the structure of 8th Embodiment of this invention. It is a schematic diagram which shows the structure of the 9th Embodiment of this invention. It is a schematic diagram which shows the structure of the tenth embodiment of this invention. It is a schematic diagram which shows the structure of 11th Embodiment of this invention. It is a schematic diagram which shows the structure of the twelfth embodiment of this invention. It is a schematic diagram which shows the structure of the 13th Embodiment of this invention. It is a schematic diagram which shows the structure of the 14th Embodiment of this invention. It is a schematic diagram which shows the structure of the fifteenth embodiment of this invention. It is a schematic diagram which shows the structure of the 16th Embodiment of this invention. It is a schematic diagram explaining the reflection and refraction characteristics of this invention. It is a schematic diagram explaining the reflection and refraction characteristics of this invention. It is a schematic diagram explaining the element characteristic of the quarter wave plate of this invention. It is a schematic diagram explaining the element characteristic of the quarter wave plate of this invention. It is a schematic diagram explaining the element characteristic of the quarter wave plate of this invention. It is a schematic diagram explaining the element characteristic of the quarter wave plate of this invention.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiments described below.

FIG. 3 is a schematic view showing the configuration of a stereoscopic image projection device according to the first embodiment of the present invention. It mainly consists of a projection module 20, an ultrafast polarization modulator 30, a splitter 40, a reflector module 50, and a reflective diffuser 60.

The projection module 20 alternately projects the first image light DL and the second image light DR at a speed of 120 FPS (Frames Per Second).

The ultrafast polarization modulator 30 (Extra Fast Preparation Modulator: X-FPM) is installed on the path of the first image light DL and the second image light DR, and the first image light DL is used as a first polarized image. It is converted into optical DL', and the second image light DR is converted into second polarized image light DR'.
See FIG. The ultrafast polarization modulator 30 has the advantages of controlling the polarization of light by applying a drive voltage from the outside, converting natural light into polarization, and having no vibration and a small occupied area. Since the technique of the ultrafast polarization modulator 30 belongs to ordinary knowledge in the field of optics, detailed description thereof will be omitted. As another option, a high-speed polarization modulator (FPM) may be selected and substituted as the ultrafast polarization modulator 30.

The Polarizer 40 is installed on the path of the first polarized image light DL'and the second polarized image light DR', and reflects the first polarized image light DL'and the second polarized image. Light DR'is transmitted.
As shown in FIG. 5, the polarizing element 40 is an optical element that separates natural light into polarized light, and the polarizing element 40 separates natural light into two polarized light (linearly polarized light that is perpendicular to each other, or contradictory to the left and right). Circular polarization direction), one of which is polarized through the polarizing element 40, and the other polarized light is reflected by the polarizing element 40.

The reflector module 50 is installed on the path of the first polarized image light DL'reflected by the polarizing element and the second polarized image light DR'transmitted by the polarizing element, and the first reflector mirror group. It has 51 and a second reflector mirror group 52. The first reflector mirror group 51 reflects the first polarized image light DL'to the reflective diffuser 60, and the second reflector mirror group 52 reflects the second polarized image light DR'to the reflective diffuser 60. do.

The reflective diffuser 60 receives the first polarized image light and the second polarized image light reflected by the reflector module, and has an array of a flat base 61 and a microcurve mirror 62 located on the base 61. .. The microcurve mirror 62 reflects the first polarized image light DL'to the first light receiving range LA, and reflects the second polarized image light DR'to the second light receiving range RA.

Further, each of the microcurve mirrors 62 of the first embodiment is arranged in the square array shown in FIG. 6A or the honeycomb array shown in FIG. 6B.

With reference to FIG. 7, the side length of each of the microcurve mirrors 62 of the first embodiment is about 25 μm to 0.25 mm, but there are many types of the microcurve mirror 62, which is preferable in the first embodiment. Only the size of the state is shown, but the actual size of the microcurve mirror 62 is not limited to this.

In the first embodiment, each of the microcurve mirrors 62 diffuses the first polarized image light DL'to the first light receiving range LA, and the second polarized image light DR'is the second light receiving range. In order to diffuse to RA, each microcurve mirror 62 is designed with the required reflection angle based on the actual position to be mounted.
FIG. 8 shows three types of microcurve mirrors 62A, 62B, 62C having different reflection angles. The reflection angles of the micro-curve mirrors 62A, 62B, 62C are not limited to those of the posted embodiment, and the reflection angles can be designed in any direction according to the demand, and the reflection angles of the micro-curve mirrors 62A, 62B, 62C can be designed. Is sufficient as long as the first polarized image light DL'is diffused in the first light receiving range LA and the second polarized image light DR'is diffused in the second light receiving range RA.

When the first image light DL is converted into the first polarized image light DL', the second image light DR is converted into the second polarized image light DR'. On the contrary, when the first image light DL is converted into the second polarized image light DR', the second image light DR is converted into the first polarized image light DL'.

In the first embodiment of the present invention, the base 61 has a plane 612, each microcurve mirror 62 is a concave mirror, and is arranged in an array on the plane 612 (see FIG. 3).

Further, in the second embodiment of the present invention, the base 61 has a curved surface 611, each microcurve mirror 62 is a concave mirror, and is arranged in an array on the curved surface 611 (see FIG. 9).

Further, in the third embodiment of the present invention, the base 61 has the plane 612, each microcurve mirror 62 is a convex mirror, and is arranged in an array on the plane 612 (see FIG. 10).

Further, in the fourth embodiment of the present invention, the base 61 has the curved surface 611, and each of the microcurve mirrors 62 is a convex mirror and is arranged in an array on the curved surface 611 (see FIG. 11).

Further, in the fifth embodiment of the present invention, the windshield 70 is further provided. The reflective diffuser 60 reflects the first polarized image light DL'and the second polarized image light DR' on the front glass 70, and the first polarized image light DL'and the second polarized image light DR' It passes through the front glass 70 and is refracted into the first light receiving range LA and the second light receiving range RA.
When applied to a real vehicle, the optical path design is usually made to enter the user's eye after being finally transmitted through the windshield or reflected by the windshield to which a reflective film is affixed. When light is reflected and refracted at the interface between two types of isotropic dielectrics, the polarization state of the light changes. The reflected light and the refracted light are partially polarized, and the light vibration (S wave) perpendicular to the incident surface in the reflected light is larger than the parallel vibration (P wave), and the refracted light is opposite. Therefore, the reflected amount of the P wave of the windshield 70 is reduced, the reflected amount of the S wave is increased, and the brightness of the image light received by both eyes of the user is different, which affects the screen quality (FIG. 12). reference).

Further, in the sixth embodiment of the present invention, the windshield 70 is provided, and the quarter wave plate 80 installed behind the polarizing element 40 is further provided. The quarter wave plate is a phase retarder and is made of birefringent material. The optical property of birefringence is that after the ray is incident, the ray has two refractions in different directions. The wave plate is usually made of quartz crystal (SiO2), has high transparency in a large wavelength range, and has high optical quality. Other materials (applied to other wavelength ranges) may be used, for example, calcium carbonate (CaCO3), magnesium fluoride (MgF2), aluminum oxide (Al2O3), mica (silicon dioxide material), birefringent polymer and the like. ..
Due to the anisotropy characteristics of each material, it has different refractive indexes and different propagation velocities for light in different polarization directions, which results in a phase difference of two quantities. The quarter wave plate 80 controls the material and thickness to cause a 1/4 wavelength phase difference between two lights with different polarization directions after the light has passed through the quarter wave plate 80. .. The quarter wave plate 80 decomposes the vibration into vibrations in two directions when one line polarization is incident, based on the "optic axis" of the material. One of them has an optical axis (fast axis) in the direction of a normal ray (ordinary ray, o-ray), and the other has a direction perpendicular to the optical axis (slow axis) in the direction of an abnormal ray (Extraordinary ray). , E-ray).
In the present embodiment, the quarter wavelength plate 80 is installed between the reflector module 50 and the reflective diffuser 60, and the first polarized image light DL'reflected by the reflector module 50 and the second The polarized image light DR'is transmitted from the quarter wavelength plate 80 to the reflective diffuser 60, reflected on the front glass 70 by the reflective diffuser 60, and the first polarized image light DL'and the second polarized light. The image light DR'is transmitted through the front glass 70 and reflected on the first light receiving range LA and the second light receiving range RA, combined with the design of the angle of the optical axis, and the first polarized image light DL. 'And the second polarized image light DR' are passed through the quarter wavelength plate 80 and converted into circularly polarized light.
Circular polarization is decomposed into quantities in the P polarization direction image light and the S polarization direction image light direction, and both have the same amplitude. Since the circularly polarized first polarized image light DL'and the circularly polarized second polarized image light DR' match due to the influence of the reflection of the windshield 70, they both have the same brightness. Finally, the user receives the first polarized image light DL'and the second polarized image light DR'of the same brightness to generate a stereoscopic image, which does not affect the screen quality, however, the first polarized image light. The optical paths of DL'and the second polarized image light DR'are different. Therefore, there is a difference in the amount of attenuation of the entire optical path, and by adjusting the angle of the optical axis of the quarter wave plate 80, the first polarized image light DL'and the second polarized image light DR' are divided into quarters. It is converted into elliptically polarized light by passing through the one-wave plate 80. Elliptical polarization decomposes into P-wave and S-wave directions, both of which have different amplitudes. Further, the difference in the amount of reflection of the P wave and the S wave of the front glass 70 compensates for the difference in the amount of attenuation of the entire optical path, and the first polarized image light DL'and the second polarized image light DR' received by the final user. Match the brightness of (see FIG. 13).

Further, in the seventh embodiment of the present invention, the windshield 70 and the quarter wave plate 80 are provided, and the concave mirror 90 is further provided. The reflective diffuser 60 reflects the first polarized image light DL'and the second polarized image light DR' on the concave mirror 90, and the first polarized image light DL'and the second polarized image light DR'are concave mirrors. The 90 reflects on the front glass 70, and is reflected from the front glass 70 to the first light receiving range LA and the second light receiving range RA.
Combined with the design of the angle of the optical axis, the first polarization direction image light and the second polarization direction image light are passed through the quarter wave plate 80 and converted into circular polarization. Circular polarization is decomposed into quantities in the P polarization direction image light and the S polarization direction image light direction, and both have the same amplitude. Since the circularly polarized first polarized image light DL'and the circularly polarized second polarized image light DR' match due to the influence of the reflection of the front windshield, they both have the same brightness. Finally, the user receives the first polarized image light DL'and the second polarized image light DR'of the same brightness to generate a stereoscopic image, which does not affect the screen quality, however, the first polarized image light. Since the optical paths of DL'and the second polarized image light DR' are different, there is a difference in the amount of attenuation of the entire optical path.
The angle of the optical axis is adjusted by the quarter wave plate 80, and the first polarized image light DL'and the second polarized image light DR' are passed through the quarter wave plate and converted into elliptically polarized light. The elliptically polarized light is decomposed into P-wave and S-wave directions, both of which have different amplitudes. Further, the difference in the amount of reflection of the P wave and the S wave of the front glass compensates for the difference in the amount of attenuation of the entire optical path, and the first polarized image light DL'and the second polarized image light DR' received by the final user. Match the brightness (see FIG. 14).

Further, in the eighth embodiment of the present invention, the extruder 40 transmits the first polarized image light DL'and reflects the second polarized image light DR', and the reflector module 50 transmits the first polarized image light DL', and the reflector module 50 transmits the first polarized image light DL'. The first polarized image light DL'is installed on the path of the first polarized image light DL'transmitted by, and the first polarized image light DL' is reflected to transmit the polarizing element 40, and the reflective diffuser 60 is the reflector module 50 . The first polarized image light DL'reflected by the above and the second polarized image light DR'reflected by the polarizing element 40 are received, and the reflective diffuser 60 receives the first polarized image light DL'and the first polarized image light DL'. The bipolarized image light DR'is reflected on the first light receiving range LA and the second light receiving range RA. In this embodiment, the base 61 of the reflective diffuser 60 is a flat surface, and each of the microcurve mirrors 62 is a concave mirror, but the base 61 is a curved surface, or the microcurve mirror 62 is a convex mirror. It may be present (see FIG. 15).

Further, in the ninth embodiment of the present invention, the polarizing element 40 transmits the first polarized image light DL'and reflects the second polarized image light DR', and the reflector module 50 transmits the first polarized light. The image light DL'is reflected and the polarizing element 40 is transmitted, and the reflective diffuser 60 transmits the first polarized image light DL'and the second polarized image light DR' to the first light receiving range LA and the first light receiving range LA. It is reflected in the second light receiving range RA. In this embodiment, the base 61 of the reflective diffuser 60 is a curved surface, and each of the microcurve mirrors 62 is a convex mirror, but the base 61 is a flat surface, or the microcurve mirror 62 is a concave mirror. It may be present (see FIG. 16).

Further, in the tenth embodiment of the present invention, the windshield 70 is provided. The polarizing element 40 transmits the first polarized image light DL'and reflects the second polarized image light DR'. The reflector module 50 reflects the first polarized image light DL'and transmits the polarizing element 40. The first polarized image light DL'and the second polarized image light DR'are reflected by the reflective diffuser 60 on the front glass 70, and the first polarized image light DL'and the second polarized image are reflected by the front glass 70. The light DR'is reflected on the first light receiving range LA and the second light receiving range RA (see FIG. 17).

Further, in the eleventh embodiment of the present invention, the windshield 70 and the quarter wave plate 80 are provided. The polarizing element 40 transmits the first polarized image light DL'and reflects the second polarized image light DR'. The reflector module 50 reflects the first polarized image light DL'and transmits the polarizing element 40. The first polarized image light DL'and the second polarized image light DR' are transmitted through the reflective diffuser 60 by the quarter wavelength plate 80, and the first polarized image light DL'and the first polarized image light DL' are transmitted by the reflective diffuser 60. The second polarized image light DR'is reflected on the front glass 70. The windshield 70 reflects the first polarized image light DL'and the second polarized image light DR' on the first light receiving range LA and the second light receiving range RA (see FIG. 18).

Further, in the twelfth embodiment of the present invention, the windshield 70, the quarter wave plate 80, and the concave mirror 90 are provided. The polarizing element 40 transmits the first polarized image light DL'and reflects the second polarized image light DR', and the reflector module 50 reflects the first polarized image light DL'and the polarizing element. 40 is transmitted.
The first polarized image light DL'and the second polarized image light DR' are transmitted through the reflective diffuser 60 by the quarter wavelength plate 80, and the first polarized image light DL'and the first polarized image light DL' are transmitted by the reflective diffuser 60. The second polarized image light DR'is reflected on the concave mirror 90, and the concave mirror 90 reflects the first polarized image light DL'and the second polarized image light DR' on the front glass 70. Finally, the windshield reflects the first polarized image light DL'and the second polarized image light DR'to the first light receiving range LA and the second light receiving range RA (see FIG. 19). ..

Further, in the thirteenth embodiment of the present invention, the stereoscopic image projection device is mainly composed of a first projection module 20A, a second projection module 20B, and the reflection type diffuser 60. The first projection module 20A projects the first image light DL. The second projection module 20B projects the second image light DR. The reflective diffuser 60 has a flat base 61 and the microcurve mirror 62 arranged in an array on the base 61, and the microcurve mirror 62 receives the first image light DL in the first light receiving range. It diffuses to LA, and the microcurve mirror 62 diffuses the second image light DR into the second light receiving range RA. In this embodiment, the base 61 of the reflective diffuser 60 is a flat surface, and each of the microcurve mirrors 62 is a concave mirror, but the base 61 is a curved surface, or the microcurve mirror 62 is a convex mirror. There may be.

The first projection module 20A and the second projection module 20B separately project the first image light DL and the second image light DR. Compared with the first embodiment of the present invention, the number of members used in the thirteenth embodiment of the present invention is significantly reduced, and the stereoscopic image projection effect is similarly achieved.

Further, the 14th embodiment of the present invention is a modification based on the structural form of the 13th embodiment. In this embodiment, the base 61 of the reflective diffuser 60 is a curved surface, and each of the microcurve mirrors 62 is It is a convex mirror. In this embodiment, the base 61 of the reflective diffuser 60 is a curved surface, and each of the microcurve mirrors 62 is a convex mirror, but the base 61 is a flat surface, or the microcurve mirror 62 is a concave mirror. It may be present (see FIG. 21).

Further, the fifteenth embodiment of the present invention is a modification based on the structural form of the thirteenth embodiment, and in this embodiment, the windshield 70 is further provided. The reflective diffuser 60 reflects the first image light DL and the second image light DR on the front glass 70, and the front glass 70 reflects the first image light DL and the second image light DR on the first image light DR. It reflects off the light receiving range LA of the eye and the second light receiving range RA of the eye (see FIG. 22).

Further, the 16th embodiment of the present invention is a modification based on the structural form of the 13th embodiment, and in this embodiment, the windshield 70 and the concave mirror 90 are further provided. The reflective diffuser 60 reflects the first image light DL and the second image light DR to the concave mirror 90, and the concave mirror 90 transfers the first image light DL and the second image light DR to the front glass 70. reflect. Finally, the windshield 70 reflects the first image light DL and the second image light DR to the first light receiving range LA and the second light receiving range RA (see FIG. 23).

See FIG. 24. Visible light passes through the air and enters the interface of the glass, and when the change in the angle of incidence becomes large, the amount of reflection of the P wave gradually decreases, and when the Brewster angle is reached, the P wave is completely refracted. And it stops reflecting. At this time, only the S wave remains in the reflected wave, and the cutting edge angle of the reflected line and the refracted line is 90 degrees. The Brewster angle is derived from the refractive indexes of the two media, and when the refractive index of the first medium is n1, the refractive index of the second medium is n2, and the Brewster angle is θB = arctan (n2 / n1).
According to FIG. 25, the first medium is air having a refractive index of 1, and the second medium is glass having a refractive index of 1.5, and the Brewster angle is also obtained from the reflection intensity measurement curves of P waves and S waves having different incident angles. I can find it. At this incident angle, the amount of reflection of the P wave becomes zero.

In particular, as shown in FIGS. 26 and 27, when the polarization and the optical axis incident on the quarter wave plate 80 are parallel or vertical (the cutting edge angle with the optical axis is 0 degrees or 90 degrees). Since the amplitude in the other direction is 0, the original linear polarization is maintained, that is, it is not decomposed in two directions.
As shown in FIG. 28, when the cutting edge angle of the polarization and the optical axis is 45 degrees, the amplitudes decomposed in the two directions are equal, and in addition, a quarter phase difference occurs, and the high speed axis and the low speed are generated. After the waves are combined in the two directions of the axis, a wave rotating in one vibration direction is generated, that is, circularly polarized. However, at other angles, the amplitudes decomposed in the two directions are different, so that the polarization changes to elliptically polarized light. This circular or elliptically polarized light may be incident on the quarter wave plate 80 and reconverted to linear polarization in the original direction (see FIG. 29).

Therefore, the first polarization direction image light and the second polarization direction image light reach the reflection type diffuser at different optical paths and angles, and receive the first polarized image light DL'or the first image light DL with the left eye. By receiving the second polarized image light DR'or the second image light DR'with the right eye, a stereoscopic image that can be seen by the naked eye without the user wearing anything is generated. Further, each microcurve mirror 62 of the present invention is manufactured so as to meet the reflection angle required based on the design, and the directivity of the reflection type diffuser 60 has a very high degree of freedom.

The above-described embodiments have been described for the purpose of allowing a person having ordinary knowledge in the technical field to which the present invention belongs to carry out the present invention. Various modifications of the above embodiment can be naturally made by those skilled in the art, and the technical idea of the present invention can be applied to other embodiments. Accordingly, the invention is not limited to the described embodiments, but is to be construed in the broadest range in accordance with the technical ideas defined by the claims.

10 Reflective screen 11 Mirror group 111 1st reflective surface 112 2nd reflective surface 12 Lens group θ1 1st cutting edge angle θ2 2nd cutting edge angle 20 Projection module 20A 1st projection module 20B 2nd projection module 30 Ultra-high speed polarization modulator 40 Polarized Child 50 Reflector module 51 1st reflector mirror group 52 2nd reflector mirror group 60 Reflective diffuser 61 Base 611 Curved surface 612 Flat surface 62 Micro curve mirror 62A Micro curve mirror 62B Micro curve mirror 62C Micro curve mirror 70 Front glass 80 1/4 Wavelength plate 90 Concave mirror DL 1st image light DL'1st polarized image light DR 2nd image light DR' 2nd polarized image light LA 1st light receiving range RA 2nd light receiving range

Claims (15)

A projection module that alternately projects the first image light and the second image light,
The first image light and the second image light are installed on the path of the first image light and the second image light, and the first image light and the second image light are converted into the first polarized image light and the second polarized image light, and the first polarization is performed. The image light and the second polarized image light are light rays whose polarization directions are perpendicular to each other, and an ultrafast polarization modulator.
A polarizing element installed on the path of the first polarized image light and the second polarized image light, which reflects the first polarized image light and transmits the second polarized image light.
The first polarized image light reflected by the polarizing element and the second polarized image light transmitted by the polarizing element are installed on the path to reflect the first polarized image light and the second polarized image light. Reflector module that reflects
The first polarized image light and the second polarized image light reflected by the reflector module are received, the first polarized image light is diffused in the first light receiving range, and the second polarized image light is second. A stereoscopic image projection device comprising: a reflective diffuser having a plurality of array-shaped microcurve mirrors diffused in a light receiving range of the eye. The stereoscopic image projection device according to claim 1, wherein when the first image light is converted into the first polarized image light, the second image light is converted into the second polarized image light. The stereoscopic image projection device according to claim 1, wherein when the first image light is converted into the second polarized image light, the second image light is converted into the first polarized image light. The stereoscopic image projection device according to claim 1, wherein the polarizing element is a reflective polarizing element or a polarizing beam splitter. Further provided with a front glass, the reflective diffuser diffuses the first polarized image light and the second polarized image light onto the front glass and then reflects the first light receiving range and the second light receiving range. The stereoscopic image projection device according to claim 1, wherein the three-dimensional image projection device is characterized by the above. Further provided with a quarter wavelength plate installed behind the polarizing element, the first polarized image light and the second polarized image light pass through the quarter wavelength plate and become circularly polarized light or elliptically polarized light. The stereoscopic image projection device according to claim 5, wherein the first polarized image light and the second polarized image light are converted and transmitted to the reflective diffuser. The stereoscopic image projection device according to claim 5 or 6, further comprising a concave mirror installed between the windshield and the reflective diffuser. The reflector module has a first reflector mirror group and a second reflector mirror group, the first reflector mirror group reflects the first polarized image light to the reflection type diffuser, and the second reflector mirror group has the first reflector mirror group. 2. The stereoscopic image projection device according to claim 1, wherein the polarized image light is reflected by the reflective diffuser. A projection module that alternately projects the first image light and the second image light,
The first image light and the second image light are installed on the path of the first image light and the second image light, and the first image light and the second image light are converted into the first polarized image light and the second polarized image light, and the first polarization is performed. The image light and the second polarized image light are light rays whose polarization directions are perpendicular to each other, and an ultrafast polarization modulator.
A ligand that is installed on the path of the first polarized image light and the second polarized image light, transmits the first polarized image light, and reflects the second polarized image light.
A reflector module installed on the path of the first polarized image light transmitted by the polarizing element and reflecting the first polarized image light to transmit the polarizing element.
The first polarized image light reflected by the reflector module and the second polarized image light reflected by the polarizing element are received, and the first polarized image light is diffused into the first light receiving range to obtain the first light receiving range. A stereoscopic image projection device comprising: a reflection type diffuser having a plurality of array-shaped microcurve mirrors for diffusing bipolarized image light into a second light receiving range. The stereoscopic image projection device according to claim 9, wherein when the first image light is converted into the first polarized image light, the second image light is converted into the second polarized image light. The stereoscopic image projection device according to claim 9, wherein when the first image light is converted into the second polarized image light, the second image light is converted into the first polarized image light. The stereoscopic image projection device according to claim 9, wherein the polarizing element is a reflective polarizing element. A front glass is further provided, and the first polarized image light and the second polarized image light are reflected and diffused on the front glass by the reflective diffuser, and then reflected on the first light receiving range and the second light receiving range. 9. The stereoscopic image projection apparatus according to claim 9. Further provided with a quarter wavelength plate installed behind the polarizing element, the first polarized image light and the second polarized image light pass through the quarter wavelength plate and become circularly polarized light or elliptically polarized light. The stereoscopic image projection device according to claim 13, wherein the first polarized image light and the second polarized image light are converted and transmitted to the reflective diffuser. The stereoscopic image projection device according to claim 13, further comprising a concave mirror installed between the windshield and the reflective diffuser.

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