JP2008134619A - Optical unit and head mounted display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical unit and a head mounted display device which enables even a weak-eyesight person to see an image while suppressing an increase in the device size. <P>SOLUTION: The optical unit 100 includes: a liquid crystal panel 110 for emitting image light; an aperture diaphragm 130 having a pin hole 131 at a focal position where video light emitted from the liquid crystal panel 110 is focused; a PBS film 140 having a tilt of approximately 45° with respect to the optical axis of the video light having passed through the pin hole 131; a 1/4λ-retardation plate 150 having a tilt of approximately 90° with respect to the optical axis of the video light having passed through the pin hole 131 and capable of converting the state of polarization of the image light having passed through the pin hole 131 from linearly polarized light to circularly polarized light; a concave mirror 160 capable of reflecting the image light having transmitted the 1/4λ-retardation plate 150 toward the side of the 1/4λ-retardation plate 150; and an eyepiece lens 200 capable of focusing the video light reflected by the concave mirror 160 on the eyeball. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an optical unit and a head-mounted display device that condenses video light emitted from a light modulation element on an eyeball.

  2. Description of the Related Art Conventionally, a head-mounted display device that collects image light emitted from a light modulation element on an eyeball is known (for example, Patent Document 1). The head-mounted display device has a configuration that is mounted on a user's head, and the user can view an image in an arbitrary posture.

  On the other hand, if the user is amblyopic, the focus function of the eye lens is reduced, so if the image light is not sufficiently focused on the pupil of the eye, the image is appropriately imaged on the retina. I can't. Accordingly, a method has been proposed in which the image light emitted from the light modulation element is narrowed down to the pinhole, and then the image light passing through the pinhole is condensed on the pupil of the eyeball.

Here, if a pinhole is provided in the immediate vicinity of the eyeball, the user's visual field is narrowed. Therefore, it is preferable that the image light that has spread after passing through the pinhole is condensed again on the pupil of the eyeball.
JP-A-7-250292 (Claim 1, FIG. 8, etc.)

  However, in order to homogenize the image light that has spread after passing through the pinhole, it is necessary to ensure a sufficient distance from the pinhole to the eyepiece. If a sufficient distance from the pinhole to the eyepiece is secured, the size of the head-mounted display device increases.

  Since the head-mounted display device is mounted on the user's head as described above, it is not preferable to increase the size of the device.

  Therefore, the present invention has been made to solve the above-described problems, and an optical unit and a head-mounted display that enable a low-sight person to view an image while suppressing an increase in the size of the apparatus. An object is to provide an apparatus.

  In one aspect, the optical unit includes a light modulation element (liquid crystal panel 110) that emits image light and an opening (pinhole 131) at a focal position where the image light emitted from the light modulation element is collected. A diaphragm section (diaphragm section 130), a first PBS film (PBS film 140) having an inclination of approximately 45 ° with respect to the optical axis of the image light passing through the opening, and the image light passing through the opening. A first retardation plate (¼λ retardation plate 150) that has an inclination of approximately 90 ° with respect to the optical axis and converts the polarization state of the image light that has passed through the opening from linearly polarized light to circularly polarized light. A first concave mirror (concave mirror 160) that reflects the image light transmitted through the first phase difference plate toward the first phase difference plate, and the image light reflected by the first concave mirror as an eyeball. Equipped with an eyepiece (eyepiece 200) that focuses light That.

  According to such a feature, since the eyepiece condenses the image light focused in the aperture provided in the aperture unit on the eyeball, even a low vision person whose focal function of the crystalline lens of the eyeball is deteriorated Can see. In addition, since the first PBS film and the first concave mirror reflect the image light, the optical path length from the stop to the eyepiece can be increased while suppressing the size increase of the device, and the image light is sufficiently homogenized. can do. Further, the first phase difference plate converts the polarization state of the image light from linearly polarized light to circularly polarized light, and then converts the polarization state of the image light from circularly polarized light to linearly polarized light. By adopting a configuration that transmits the light twice, it is possible to rotate the polarization state of the image light by 90 ° and extract the image light converted from S-polarized light to P-polarized light or the image light converted from P-polarized light to S-polarized light. Become.

  In the one feature described above, when the image light passing through the opening is S-polarized light, the eyepiece is provided at a position facing the first concave mirror across the first PBS film.

  In the one feature described above, when the image light passing through the opening is P-polarized light, the eyepiece is provided on the same side as the first concave mirror with the first PBS film as a boundary.

  In the one feature described above, the optical unit is provided at a position facing the first concave mirror across the first PBS film when the image light passing through the opening is S-polarized light, A second retardation plate (¼λ retardation plate 170) for converting the polarization state of the image light transmitted through the first PBS film from linearly polarized light to circularly polarized light, and the image light transmitted through the second retardation plate. A reflection mirror (reflection mirror 180) that reflects toward the second phase difference plate; In the case where the image light passing through the opening is S-polarized light, the eyepiece is provided on the same side as the reflection mirror with the first PBS film as a boundary.

  In the one feature described above, the optical unit is provided on the same side as the first concave mirror with the first PBS film as a boundary when the image light passing through the opening is P-polarized light. A second retardation plate (¼λ retardation plate 170) for converting the polarization state of the image light reflected by the 1 PBS film from linearly polarized light to circularly polarized light, and the image light transmitted through the second retardation plate. A reflection mirror (reflection mirror 180) that reflects toward the second phase difference plate; When the image light passing through the opening is P-polarized light, the eyepiece is provided at a position facing the reflection mirror with the first PBS film interposed therebetween.

  In the one feature described above, the optical unit includes a second PBS film (PBS film 210) having an inclination of about 45 ° with respect to the optical axis of the image light emitted from the light modulation element, and the second PBS film. A third retardation plate (¼λ retardation plate 220) for converting the polarization state of the reflected image light or the image light transmitted through the second PBS film from linearly polarized light to circularly polarized light, and the third phase difference. A second concave mirror (concave mirror 230) that reflects the image light transmitted through the plate to the third phase difference plate side; The second concave mirror condenses the image light on the opening.

  In one feature, the head mounted display device attached to the user's head has an annular shape, and is provided on the annular member on the user's head and on the annular member on the user's back of the head. And an adjustment tool for adjusting a gap formed between the user's occipital region and the inner surface of the annular member, and provided on the annular member on the user's forehead side and pressed against the user's nose. A nose pad, a display unit provided in front of the user's eyeball, and a connecting member that is provided on the annular member on the frontal side of the user and connects the annular member and the display unit. . The display unit includes a light modulation element that emits image light, a light source that irradiates light to the light modulation element, and an aperture having an opening at a focal position where the image light emitted from the light modulation element is condensed A first PBS film having an inclination of approximately 45 ° with respect to the optical axis of the image light passing through the opening, and an inclination of approximately 90 ° with respect to the optical axis of the image light passing through the opening. A first retardation plate that converts the polarization state of the image light that has passed through the opening from linearly polarized light to circularly polarized light, and the image light that has passed through the first retardation plate is converted to the first retardation plate. A first concave mirror that reflects to the side, and an eyepiece that condenses the image light reflected by the first concave mirror on an eyeball.

  In the one feature described above, the head-mounted display device further includes an ear pad that is provided downward from the annular member on the user's temporal side and is pressed against the base of the user's ear.

  In the one feature described above, the connecting member includes a first arm portion provided on the annular member side and a second arm portion provided on the display unit side, and the first arm portion. Supports the second arm portion in a rotatable manner.

  In the one feature described above, the annular member rotatably supports the first arm portion.

  In the one feature described above, the second arm portion rotatably supports the display unit.

  According to the present invention, it is possible to provide an optical unit and a head-mounted display device that enable even a weak eyesight to see an image while suppressing an increase in the size of the device.

  Hereinafter, a head-mounted display device according to an embodiment of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals.

  However, it should be noted that the drawings are schematic and ratios of dimensions are different from actual ones. Therefore, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

[First Embodiment]
(Outline of head-mounted display device)
Hereinafter, an outline of the head mounted display device according to the first embodiment will be described with reference to the drawings. FIG. 1 is a diagram schematically illustrating the head mounted display device 20 according to the first embodiment.

  As shown in FIG. 1, the head mounted display device 20 has a configuration that is mounted on the head of the user 10. The configuration of the head mounted display device 20 may be a configuration that is worn like glasses or a configuration that is worn like a helmet.

  In the first embodiment, the head mounted display device 20 is a device that focuses video light on the eyeball of the user 10. In particular, in the first embodiment, the head-mounted display device 20 is a device that allows the user 10 to view the image light even if the user 10 is a low vision person. Note that the user 10 can view the video in an arbitrary posture.

(Configuration of optical unit)
Hereinafter, the configuration of the optical unit according to the first embodiment will be described with reference to the drawings. FIG. 2 is a diagram illustrating a configuration of the optical unit 100 according to the first embodiment.

  As shown in FIG. 2, the optical unit 100 includes a liquid crystal panel 110, a condenser lens 120, a diaphragm 130, a PBS film 140, a ¼λ phase plate 150, a concave mirror 160, and an eyepiece lens 200. And have.

  The liquid crystal panel 110 is a light modulation element that modulates light emitted from a light source (not shown) and emits image light. The liquid crystal panel 110 emits S-polarized image light.

  The condensing lens 120 condenses the image light emitted from the liquid crystal panel 110. Specifically, the condensing lens 120 condenses the image light in an opening (pinhole 131) provided in the diaphragm unit 130.

  The diaphragm 130 is configured by a light shielding member. The diaphragm unit 130 has a pinhole 131 through which the image light condensed by the condenser lens 120 passes. The diaphragm 130 is arranged so that the pinhole 131 overlaps the focal position of the condenser lens 120.

  The PBS film 140 is a PBS (Polarized Beam Splitter) film that separates light into reflected light and transmitted light according to the polarization direction of the light. Specifically, the PBS film 140 transmits P-polarized image light and reflects S-polarized image light. The PBS film 140 has an inclination of approximately 45 ° with respect to the optical axis of the image light that has passed through the pinhole 131. The PBS film 140 reflects the S-polarized image light that has passed through the pinhole 131 to the concave mirror 160 side, and transmits the P-polarized video light that has been reflected by the concave mirror 160 and returned to the eyepiece lens 200 side. .

  The quarter-wave retardation plate 150 is a retardation plate that converts the polarization state of light from linearly polarized light to circularly polarized light and converts the polarization state of light from circularly polarized light to linearly polarized light. The quarter-wave retardation plate 150 has an inclination of about 90 ° with respect to the optical axis of the image light that has passed through the pinhole 131 (in FIG. 2, the optical axis of the image light reflected by the PBS film 140). The 1 / 4λ phase difference plate 150 is provided on the side where the image light is reflected by the PBS film 140.

  The concave mirror 160 reflects the image light transmitted through the ¼λ phase difference plate 150 toward the ¼λ phase difference plate 150. The concave mirror 160 homogenizes the image light by reflecting the image light.

  As described above, the image light reflected by the PBS film 140 passes through the ¼λ phase plate 150, is then reflected by the concave mirror 160, and passes through the ¼λ phase plate 150 again. That is, the image light reflected by the PBS film 140 passes through the ¼λ phase plate 150 twice, so that the polarization direction of the image light is rotated by approximately 90 °, and the polarization state of the image light is changed from S-polarized light to P-polarized light. Conversion from polarized light or P-polarized light to S-polarized light.

  Therefore, the polarization direction of the image light reflected by the concave mirror 160 and transmitted again through the ¼λ phase difference plate 150 is P-polarized light. As a result, the image light reflected by the concave mirror 160 passes through the PBS film 140.

  The eyepiece lens 200 condenses the image light reflected by the concave mirror 160 on the pupil 12 of the eyeball 11. The eyepiece lens 200 focuses the image light condensed on the pupil 12 on the retina of the eyeball 11. Since the image light reflected by the concave mirror 160 passes through the PBS film 140, the eyepiece 200 is provided at a position facing the concave mirror 160 with the PBS film 140 interposed therebetween.

(Function and effect)
According to the optical unit 100 according to the first embodiment, the eyepiece 200 concentrates the image light focused in the pinhole 131 provided in the diaphragm 130 on the pupil 12 of the eyeball 11, and thus the crystalline lens of the eyeball 11. Even a weakly sighted person whose focus function is degraded can see the video. In addition, since the PBS film 140 and the concave mirror 160 reflect the image light, the optical path length from the diaphragm unit 130 to the eyepiece lens 200 can be increased while suppressing an increase in the size of the apparatus, and the image light is sufficiently homogeneous. Can be Further, the 1 / 4λ phase plate 150 changes the polarization state of the image light from linearly polarized light to circularly polarized light and then converts the polarization state of the image light from circularly polarized light to linearly polarized light. By adopting a configuration in which the image light is transmitted twice, the polarization state of the image light is rotated by 90 °, and the image light converted from S-polarized light to P-polarized light or the image light converted from P-polarized light to S-polarized light is taken out. It becomes possible.

[Second Embodiment]
The second embodiment will be described below with reference to the drawings. In the following, differences between the first embodiment and the second embodiment described above will be mainly described.

  In the first embodiment described above, the video light emitted from the liquid crystal panel 110 (video light that has passed through the pinhole 131) is S-polarized light. In contrast, in the second embodiment, the image light emitted from the liquid crystal panel 110 (image light that has passed through the pinhole 131) is P-polarized light.

(Configuration of optical unit)
The configuration of the optical unit according to the second embodiment will be described below with reference to the drawings. FIG. 3 is a diagram illustrating a configuration of the optical unit 100 according to the second embodiment. In FIG. 3, it should be noted that the same components as those in FIG.

  As shown in FIG. 3, the liquid crystal panel 110 emits P-polarized image light, and the condenser lens 120 condenses the P-polarized image light in the pinhole 131.

  The PBS film 140 has an inclination of approximately 45 ° with respect to the optical axis of the image light that has passed through the pinhole 131. The PBS film 140 transmits the P-polarized video light that has passed through the pinhole 131 to the concave mirror 160 side, and reflects the S-polarized video light that has been reflected by the concave mirror 160 and returned to the eyepiece lens 200 side. .

  The quarter-wave retardation plate 150 has an inclination of about 90 ° with respect to the optical axis of the video light that has passed through the pinhole 131 (in FIG. 3, the optical axis of the video light that has passed through the PBS film 140). The quarter-wave retardation plate 150 is provided on the side where the image light is transmitted through the PBS film 140.

  The concave mirror 160 reflects the image light transmitted through the ¼λ phase difference plate 150 toward the ¼λ phase difference plate 150. The concave mirror 160 homogenizes the image light by reflecting the image light.

  As described above, the image light transmitted through the PBS film 140 is transmitted through the ¼λ phase difference plate 150, then reflected by the concave mirror 160, and again transmitted through the ¼λ phase difference plate 150. That is, the image light transmitted through the PBS film 140 is transmitted through the ¼λ phase plate 150 twice, whereby the polarization direction of the image light is rotated by approximately 90 °, and the polarization state of the image light is changed from S-polarized light to P-polarized light. Alternatively, P-polarized light is converted to S-polarized light.

  Therefore, the polarization direction of the image light reflected by the concave mirror 160 and transmitted again through the 1 / 4λ phase difference plate 150 is S-polarized light. As a result, the image light reflected by the concave mirror 160 is reflected by the PBS film 140.

The eyepiece lens 200 condenses the image light reflected by the concave mirror 160 on the pupil 12 of the eyeball 11. The eyepiece lens 200 focuses the image light condensed on the pupil 12 on the retina of the eyeball 11. Since the image light reflected by the concave mirror 160 is reflected by the PBS film 140, the eyepiece 200 has two spaces (area A) in the optical unit 100 with the extended surface (S _PBS ) of the PBS film 140 as a boundary. And the region B), it is provided in the region (region A) on the same side as the concave mirror 160.

(Function and effect)
According to the optical unit 100 according to the second embodiment, even if the image light passing through the pinhole 131 provided in the diaphragm 130 is P-polarized light, the same effect as in the first embodiment can be obtained.

[Third Embodiment]
Hereinafter, a third embodiment will be described with reference to the drawings. In the following, differences between the first embodiment and the third embodiment described above will be mainly described.

  Specifically, in the first embodiment described above, the image light reflected by the concave mirror 160 passes through the PBS film 140 and is irradiated to the eyepiece 200 as it is. On the other hand, in the third embodiment, the image light reflected by the concave mirror 160 is reflected again by the reflecting mirror and then irradiated to the eyepiece 200.

(Configuration of optical unit)
The configuration of the optical unit according to the third embodiment will be described below with reference to the drawings. FIG. 4 is a diagram illustrating a configuration of the optical unit 100 according to the third embodiment. In FIG. 4, it should be noted that the same reference numerals are given to the same components as those in FIG.

  As shown in FIG. 4, the optical unit 100 includes a ¼λ phase difference plate 170 and a reflection mirror 180 in addition to the configuration shown in FIG. 2.

  As shown in FIG. 4, the liquid crystal panel 110 emits S-polarized video light, and the condenser lens 120 condenses the S-polarized video light in the pinhole 131.

  Similarly to the 1 / 4λ phase difference plate 150, the 1 / 4λ phase difference plate 170 converts the polarization state of light from linearly polarized light to circularly polarized light, and converts the polarization state of light from circularly polarized light to linearly polarized light. It is. Since the image light reflected by the concave mirror 160 and transmitted through the ¼λ phase plate 150 is P-polarized light, the ¼λ phase plate 170 is provided at a position facing the concave mirror 160 with the PBS film 140 interposed therebetween. It is done.

  The reflection mirror 180 is a flat mirror that reflects the image light transmitted through the ¼λ phase difference plate 170 toward the ¼λ phase difference plate 170.

  As described above, the image light transmitted through the PBS film 140 is transmitted through the ¼λ phase difference plate 170, reflected by the reflection mirror 180, and transmitted through the ¼λ phase difference plate 170 again. That is, the image light transmitted through the PBS film 140 is transmitted through the 1 / 4λ phase difference plate 170 twice, whereby the polarization direction of the image light is rotated by approximately 90 °, and the polarization state of the image light is changed from S polarization to P polarization. Alternatively, P-polarized light is converted to S-polarized light.

  Accordingly, the polarization direction of the image light reflected by the reflection mirror 180 and transmitted again through the ¼λ phase difference plate 170 is S-polarized light. As a result, the image light reflected by the reflection mirror 180 is reflected by the PBS film 140.

Since the image light reflected by the reflecting mirror 180 is reflected by the PBS film 140, the eyepiece 200 has two spaces (the two areas (the space inside the optical unit 100) with the extended surface (S _PBS ) of the PBS film 140 as a boundary. When divided into the region A and the region B), it is provided in the region (region A) on the same side as the reflection mirror 180.

(Function and effect)
According to the optical unit 100 according to the third embodiment, in addition to the configuration of the first embodiment, the reflection mirror 180 reflects the image light. A sufficient optical path length up to 200 can be ensured. Further, the 1 / 4λ phase difference plate 170 is changed so that the polarization state of the image light is changed from the circular polarization to the linear polarization after the polarization state of the image light is changed from the linear polarization to the circular polarization. By adopting a configuration in which the image light is transmitted twice, the polarization state of the image light is rotated by 90 °, and the image light converted from S-polarized light to P-polarized light or the image light converted from P-polarized light to S-polarized light is taken out. It becomes possible.

[Fourth Embodiment]
Hereinafter, a fourth embodiment will be described with reference to the drawings. In the following, differences between the above-described third embodiment and the fourth embodiment will be mainly described.

  In the third embodiment described above, the video light emitted from the liquid crystal panel 110 (video light that has passed through the pinhole 131) is S-polarized light. On the other hand, in the fourth embodiment, the image light emitted from the liquid crystal panel 110 (image light that has passed through the pinhole 131) is P-polarized light.

(Configuration of optical unit)
The configuration of the optical unit according to the fourth embodiment will be described below with reference to the drawings. FIG. 5 is a diagram illustrating a configuration of the optical unit 100 according to the fourth embodiment. In FIG. 5, it should be noted that the same components as those in FIG.

  As shown in FIG. 5, the liquid crystal panel 110 emits P-polarized image light, and the condenser lens 120 condenses the P-polarized image light in the pinhole 131.

Similarly to the 1 / 4λ phase difference plate 150, the 1 / 4λ phase difference plate 170 converts the polarization state of light from linearly polarized light to circularly polarized light, and converts the polarization state of light from circularly polarized light to linearly polarized light. It is. Since the image light reflected by the concave mirror 160 and transmitted through the 1 / 4λ phase difference plate 150 is S-polarized light, the 1 / 4λ phase difference plate 170 is an optical unit with the extended surface (S _PBS ) of the PBS film 140 as a boundary. When the space in 100 is divided into two regions (region A and region B), it is provided in the region (region A) on the same side as the concave mirror 160.

  As described above, the image light reflected by the PBS film 140 passes through the ¼λ phase difference plate 170, is then reflected by the reflection mirror 180, and passes through the ¼λ phase difference plate 170 again. That is, the image light reflected by the PBS film 140 passes through the ¼λ phase difference plate 170 twice, whereby the polarization direction of the image light rotates by approximately 90 °, and the polarization state of the image light changes from S-polarized light to P-polarized light. Conversion from polarized light or P-polarized light to S-polarized light.

  Therefore, the polarization direction of the image light reflected by the reflection mirror 180 and transmitted again through the ¼λ phase difference plate 170 is P-polarized light. As a result, the image light reflected by the reflection mirror 180 passes through the PBS film 140.

  Since the image light reflected by the reflection mirror 180 passes through the PBS film 140, the eyepiece 200 is provided at a position facing the reflection mirror 180 with the PBS film 140 interposed therebetween.

(Function and effect)
According to the optical unit 100 according to the fourth embodiment, even if the image light passing through the pinhole 131 provided in the diaphragm unit 130 is P-polarized light, the same effect as in the third embodiment can be obtained.

[Fifth Embodiment]
Hereinafter, a fifth embodiment will be described with reference to the drawings. In the following, differences between the above-described first embodiment and the fifth embodiment will be mainly described.

  Specifically, in the first embodiment described above, the light emitted from the liquid crystal panel 110 is condensed into the pinhole 131 by the condenser lens 120. On the other hand, in the fifth embodiment, the light emitted from the liquid crystal panel 110 is collected in the pinhole 131 by the PBS film, the 1 / 4λ phase difference plate, and the concave mirror.

(Configuration of optical unit)
The configuration of the optical unit according to the fifth embodiment will be described below with reference to the drawings. FIG. 6 is a diagram illustrating a configuration of the optical unit 100 according to the fifth embodiment. In FIG. 6, it should be noted that the same components as those in FIG. In FIG. 6, it should be noted that only the configuration from the liquid crystal panel 110 to the aperture unit 130 is illustrated, and the configuration from the aperture unit 130 to the eyepiece 200 is omitted.

  As shown in FIG. 6, the optical unit 100 includes a PBS film 210, a ¼λ phase difference plate 220, and a concave mirror 230. The liquid crystal panel 110 emits S-polarized image light.

  Similar to the PBS film 140, the PBS film 210 is a PBS (Polarized Beam Splitter) film that separates light into reflected light and transmitted light according to the polarization direction of the light. The PBS film 210 has an inclination of about 45 ° with respect to the optical axis of the image light emitted from the liquid crystal panel 110. The PBS film 210 reflects the S-polarized video light emitted from the liquid crystal panel 110 toward the concave mirror 230 and transmits the P-polarized video light reflected and returned from the concave mirror 230 to the diaphragm 130 side. To do.

The quarter-wave retardation plate 220 converts the polarization state of the image light reflected by the PBS film 210 from linearly polarized light to circularly polarized light, and converts the polarization state of light from circularly polarized light to linearly polarized light. Since the image light emitted from the liquid crystal panel 110 is S-polarized light, the ¼λ phase difference plate 220 divides the space in the optical unit 100 into two regions (regions) with the extended surface (S _PBS ) of the PBS film 210 as a boundary. C and region D) are provided in the region (region C) on the same side as the liquid crystal panel 110.

  The concave mirror 230 reflects the image light transmitted through the ¼λ phase difference plate 220 toward the ¼λ phase difference plate 220. The concave mirror 230 condenses the image light in the pinhole 131 provided in the aperture unit 130 by reflecting the image light.

  As described above, the image light reflected by the PBS film 210 passes through the ¼λ phase difference plate 220, is then reflected by the concave mirror 230, and passes through the ¼λ phase difference plate 220 again. That is, the image light reflected by the PBS film 210 passes through the ¼λ phase difference plate 220 twice, whereby the polarization direction of the image light is rotated by approximately 90 °, and the polarization state of the image light changes from S-polarized light to P-polarized light. Conversion from polarized light or P-polarized light to S-polarized light.

  Therefore, the polarization direction of the image light reflected by the concave mirror 230 and transmitted again through the ¼λ phase difference plate 220 is P-polarized light. As a result, the image light reflected by the concave mirror 230 passes through the PBS film 210.

  Since the image light reflected by the concave mirror 230 passes through the PBS film 210, the diaphragm 130 is provided at a position facing the concave mirror 230 with the PBS film 210 interposed therebetween.

(Function and effect)
According to the optical unit 100 according to the fifth embodiment, the concave mirror 230 reflects the image light and then concentrates the image light on the pinhole 131 provided in the diaphragm unit 130, thereby suppressing an increase in the size of the device. However, the optical path length from the liquid crystal panel 110 to the diaphragm 130 can be increased. Further, the 1 / 4λ retardation plate 220 converts the polarization state of the image light from linear polarization to circular polarization and then converts the polarization state of the image light from circular polarization to linear polarization. By adopting a configuration in which the image light is transmitted twice, the polarization state of the image light is rotated by 90 °, and the image light converted from S-polarized light to P-polarized light or the image light converted from P-polarized light to S-polarized light is taken out. It becomes possible.

[Sixth Embodiment]
The sixth embodiment will be described below with reference to the drawings. In the following, differences between the above-described fifth embodiment and the sixth embodiment will be mainly described.

  Specifically, in the fifth embodiment described above, the image light emitted from the liquid crystal panel 110 is S-polarized light. In contrast, in the second embodiment, the image light emitted from the liquid crystal panel 110 is P-polarized light.

(Configuration of optical unit)
The configuration of the optical unit according to the sixth embodiment will be described below with reference to the drawings. FIG. 7 is a diagram illustrating a configuration of the optical unit 100 according to the sixth embodiment. In FIG. 7, it should be noted that the same components as those in FIG. In FIG. 7, it should be noted that only the configuration from the liquid crystal panel 110 to the diaphragm unit 130 is illustrated, and the configuration from the diaphragm unit 130 to the eyepiece 200 is omitted. The liquid crystal panel 110 emits P-polarized video light.

  As shown in FIG. 7, the PBS film 210 has an inclination of approximately 45 ° with respect to the optical axis of the image light emitted from the liquid crystal panel 110. The PBS film 210 transmits the P-polarized video light emitted from the liquid crystal panel 110 to the concave mirror 230 side, and reflects the S-polarized video light reflected by the concave mirror 230 and returning to the diaphragm unit 130 side. To do.

  The quarter-wave retardation plate 220 converts the polarization state of the image light transmitted through the PBS film 210 from linearly polarized light to circularly polarized light, and converts the polarization state of light from circularly polarized light to linearly polarized light. Since the image light emitted from the liquid crystal panel 110 is P-polarized light, the ¼λ phase difference plate 220 is provided at a position facing the liquid crystal panel 110 with the PBS film 210 interposed therebetween.

  The concave mirror 230 reflects the image light transmitted through the ¼λ phase difference plate 220 toward the ¼λ phase difference plate 220. The concave mirror 230 condenses the image light in the pinhole 131 provided in the aperture unit 130 by reflecting the image light.

  As described above, the image light transmitted through the PBS film 210 is transmitted through the ¼λ phase difference plate 220, then reflected by the concave mirror 230, and again transmitted through the ¼λ phase difference plate 220. That is, the image light transmitted through the PBS film 210 is transmitted through the 1 / 4λ phase difference plate 220 twice, whereby the polarization direction of the image light is rotated by approximately 90 °, and the polarization state of the image light is changed from S-polarized light to P-polarized light. Alternatively, P-polarized light is converted to S-polarized light.

  Therefore, the polarization direction of the image light reflected by the concave mirror 230 and transmitted again through the ¼λ phase difference plate 220 is S-polarized light. As a result, the image light reflected by the concave mirror 230 is reflected by the PBS film 210.

In addition, since the image light reflected by the concave mirror 230 is reflected by the PBS film 210, the diaphragm unit 130 divides the space in the optical unit 100 into two regions (with the extended surface (S _PBS ) of the PBS film 210 as a boundary). When divided into region C and region D), it is provided in the region (region D) on the same side as the concave mirror 230.

(Function and effect)
According to the optical unit 100 according to the sixth embodiment, even if the image light emitted from the liquid crystal panel 110 is P-polarized light, the same effect as that of the fifth embodiment can be obtained.

[Seventh Embodiment]
Hereinafter, a seventh embodiment will be described with reference to the drawings. In the following, differences between the above-described fifth embodiment and the seventh embodiment will be mainly described.

  Specifically, in the fifth embodiment described above, the image light reflected by the concave mirror 230 is collected in the pinhole 131 provided in the diaphragm 130 and is taken out as it is. On the other hand, in the seventh embodiment, the image light collected in the pinhole 131 is collected in the pinhole 131 provided in the diaphragm 130 and then reflected by the minimal mirror and then extracted.

(Configuration of optical unit)
The configuration of the optical unit according to the seventh embodiment will be described below with reference to the drawings. FIG. 8 is a diagram illustrating a configuration of the optical unit 100 according to the seventh embodiment. In FIG. 8, it should be noted that the same components as those in FIG. In FIG. 8, it should be noted that only the configuration from the liquid crystal panel 110 to the aperture unit 130 is shown, and the configuration from the aperture unit 130 to the eyepiece 200 is omitted.

  As shown in FIG. 8, the optical unit 100 includes a ¼λ phase difference plate 240 and a minimal mirror 250 in addition to the configuration shown in FIG. 6. The liquid crystal panel 110 emits S-polarized image light.

  Similarly to the 1 / 4λ phase difference plate 150, the 1 / 4λ phase difference plate 240 converts the polarization state of light from linearly polarized light to circularly polarized light, and converts the polarization state of light from circularly polarized light to linearly polarized light. It is. Since the image light reflected by the concave mirror 230 and transmitted through the ¼λ phase difference plate 220 is P-polarized light, the ¼λ phase difference plate 240 is provided at a position facing the concave mirror 230 with the PBS film 210 interposed therebetween. It is done. In addition, since the image light is collected in the pinhole 131 provided in the diaphragm 130, it is sufficient that the ¼λ phase difference plate 240 has a size that covers the pinhole 131. From the viewpoint of effective use of image light and reduction in size, it is preferable that the ¼λ phase difference plate 240 is disposed close to the pinhole 131.

  The minimal mirror 250 is a flat mirror that reflects the image light transmitted through the ¼λ phase difference plate 240 toward the ¼λ phase difference plate 240. Since the image light is focused on the pinhole 131 provided in the aperture section 130, the minimal mirror 250 has a size that covers the pinhole 131, similar to the ¼λ phase difference plate 240. It is enough. From the viewpoint of effective use of image light and reduction in size, it is preferable that the minimal mirror 250 is disposed in the vicinity of the pinhole 131.

  As described above, the image light transmitted through the PBS film 210 passes through the ¼λ phase difference plate 240, is reflected by the minimal mirror 250, and passes through the ¼λ phase difference plate 240 again. That is, the image light transmitted through the PBS film 210 is transmitted through the 1 / 4λ phase difference plate 240 twice, whereby the polarization direction of the image light is rotated by approximately 90 °, and the polarization state of the image light is changed from S-polarized light to P-polarized light. Alternatively, P-polarized light is converted to S-polarized light.

  Therefore, the polarization direction of the image light reflected by the minimal mirror 250 and transmitted again through the ¼λ phase difference plate 240 is S-polarized light. As a result, the image light reflected by the minimal mirror 250 is reflected by the PBS film 210.

  As shown in FIG. 8, the liquid crystal panel 110, the diaphragm 130, the PBS film 210, the 1 / 4λ phase difference plate 220, the concave mirror 230, the 1 / 4λ phase difference plate 240, and the minimal mirror 250 are preferably unitized. .

(Function and effect)
According to the optical unit 100 according to the seventh embodiment, in addition to the configuration of the fifth embodiment, since the minimal mirror 250 reflects the image light, the liquid crystal panel 110 can further reduce the size of the device while further reducing the size of the device. The optical path length up to 130 can be increased. Further, the 1 / 4λ phase difference plate 240 converts the polarization state of the image light from the circularly polarized light to the circularly polarized light and then converts the polarization state of the image light from the circularly polarized light to the linearly polarized light. By adopting a configuration in which the image light is transmitted twice, the polarization state of the image light is rotated by 90 °, and the image light converted from S-polarized light to P-polarized light or the image light converted from P-polarized light to S-polarized light is taken out. It becomes possible.

[Eighth Embodiment]
The eighth embodiment will be described below with reference to the drawings. The eighth embodiment is an embodiment in which the above-described fourth embodiment and fifth embodiment are combined.

(Configuration of optical unit)
The configuration of the optical unit according to the eighth embodiment will be described below with reference to the drawings. FIG. 9 is a diagram showing a configuration of the optical unit 100 according to the eighth embodiment. In FIG. 9, it should be noted that the same components as those in FIGS. 5 and 6 are denoted by the same reference numerals.

  As shown in FIG. 9, the optical unit 100 has the configuration shown in FIG. 5 and the configuration shown in FIG. Specifically, the optical unit 100 has the configuration shown in FIG. 6 with respect to the configuration from the liquid crystal panel 110 to the aperture unit 130, and the configuration from the aperture unit 130 to the eyepiece lens 200 has the configuration shown in FIG. The configuration shown in FIG.

[Ninth Embodiment]
Hereinafter, the volume of the housing that houses the optical unit 100 will be described with reference to the drawings. As a comparative example, an optical unit in which the above-described PBS film or 1 / 4λ phase difference plate is not used is illustrated. As an example, the optical unit according to the above-described eighth embodiment is illustrated. Here, the optical unit is a unit composed of optical elements from a liquid crystal panel to an eyepiece. Therefore, the housing accommodates optical elements from the liquid crystal panel to the eyepiece.

(Comparative example)
Hereinafter, a comparative example will be described with reference to FIG. As shown in FIG. 10, in the comparative example, a point light source 310 that emits light emitted to the liquid crystal panel 110 and a lens 320 that collimates the light emitted from the point light source 310 are provided.

  The optical unit according to the comparative example includes a liquid crystal panel 110, a lens 120a, a lens 120b, a diaphragm unit 130, and an eyepiece lens 200. Since the liquid crystal panel 110, the diaphragm unit 130, and the eyepiece lens 200 have the same configurations as those in the above-described embodiment, descriptions thereof are omitted.

  The lens 120a and the lens 120b are a re-diffractive optical system that substantially forms an image formed on the liquid crystal panel 110 on the image plane 110x. The diaphragm 130 is disposed so that the pinhole 131 overlaps the focal position of the lens 120a.

  Here, the length (housing length LM) required for the housing that houses the optical unit is the total of the optical paths a to e, and is “5f”. Here, “f” is the focal length of the lens 120a, the lens 120b, and the eyepiece 200.

  Accordingly, the volume of the housing that houses the optical unit is “S × LM = S × 5f”. However, S is a cross-sectional area of the light beam emitted from the liquid crystal panel 110.

(Example)
Hereinafter, examples will be described with reference to FIGS. 11A and 11B. As shown in FIG. 11A, in the embodiment, a point light source 310 that emits light emitted to the liquid crystal panel 110 and a lens 320 that collimates the light emitted from the point light source 310 are provided. .

  As in the eighth embodiment, the optical unit 100 according to the example includes the liquid crystal panel 110, the PBS film 210, the ¼λ phase difference plate 220, the concave mirror 230, the diaphragm 130, and the PBS film 140. , 1 / 4λ phase difference plate 150, concave mirror 160, 1 / 4λ phase difference plate 170, reflection mirror 180, and eyepiece lens 200. Since each optical element has the same configuration as that of the above-described eighth embodiment, description of each optical element is omitted.

  In the optical unit 100 according to the embodiment, as shown in FIGS. 11A and 11B, the optical path a and the optical path b are overlapped by the PBS film 210, and the optical paths c to e are overlapped by the PBS film 140. The

  Here, the length (housing length L′ M ′) required for the housing that houses the optical unit 100 is “2f”. Here, “f” is the focal length of the lens 120a, the concave mirror 160, and the concave mirror 230. It should be noted that the F number of the lens 120a, the concave mirror 160, and the concave mirror 230 is assumed to be “1”.

  Therefore, the volume of the housing that houses the optical unit 100 is “S × LM = S × 2f”. However, S is a cross-sectional area of the light beam emitted from the liquid crystal panel 110.

(Comparison between comparative example and example)
As described above, the optical path length from the liquid crystal panel 110 to the eyepiece lens 200 in the embodiment is the same as the optical path length from the liquid crystal panel 110 to the eyepiece lens 200 in the comparative example. On the other hand, the length (housing length L′ M ′) necessary for the housing that houses the optical unit 100 according to the embodiment is the length (housing length LM) that is necessary for the housing that houses the optical unit according to the comparative example. Shorter than).

  As a result, the volume of the housing that houses the optical unit 100 according to the embodiment is smaller than the volume of the housing that houses the optical unit according to the comparative example. Specifically, the volume of the housing according to the example is 2/5 of the volume of the housing according to the comparative example.

[Tenth embodiment]
Hereinafter, the tenth embodiment will be described with reference to FIGS. 12 (a) and 12 (b). FIG. 12A is a diagram showing a side view of the head-mounted display device 20, and FIG. 12B is a diagram showing a top view of the head-mounted display device 20.

  As shown in FIGS. 12A and 12B, the head-mounted display device 20 includes an annular member 410, an adjustment tool 420, a nose pad 430, an ear pad 440 (ear pad 440a and ear pad 440b), A connecting member 450 and a display unit 460 are included.

  The annular member 410 is a member that is attached to the head of the user 10 and has an annular shape. The annular member 410 is made of a plastic resin or the like.

  The adjusting tool 420 is provided on the annular member 410 on the back head 15 side of the user 10, and adjusts the gap p formed between the back head 15 of the user 10 and the inner surface 410 a of the annular member 410. For example, the adjustment tool 420 has a configuration that adjusts the size of the annular member 410 so that the inner diameter of the inner surface 410a becomes smaller. The adjuster 420 may have a configuration in which a occipital pad provided inside the inner surface 410 a is pressed against the occipital region 15.

  The nose pad 430 is provided downward from the annular member 410 on the frontal side of the user 10 and is a pad pressed against the nose (nasal muscles). The head mounted display device 20 is supported by the nose by the nose pad 430.

  The ear pad 440 is provided downward from the annular member 410 on the temporal side of the user 10 and is a pad that is pressed against the base of the ear. The head-mounted display device 20 is supported by the ear pad 440 at the base of the ear.

  The connecting member 450 is provided downward from the annular member 410 on the front head side of the user 10, and connects the annular member 410 and the display unit 460. Specifically, as shown in FIG. 13, the connecting member 450 includes a mounting tool 451, a mounting tool 452, an arm part 453, and an arm part 456.

  The attachment 451 is a member attached to the annular member 410 by screwing or bonding. The attachment 451 supports the rotating ball 454 provided on the arm portion 453 so as to be rotatable.

  The attachment 452 is a member attached to the display unit 460 by screwing or bonding. The attachment 452 is rotatably supported by a rotating ball 458 provided on the arm portion 456.

  The arm portion 453 is rotatably supported by a fixture 451 and has a conical movable range. Specifically, the arm portion 453 includes a rotating ball 454 and a ball support portion 455. The rotating ball 454 has a spherical shape. The ball support portion 455 supports the rotating ball 457 provided on the arm portion 456 so as to be rotatable.

  The arm portion 456 is rotatably supported by the arm portion 453 and has a conical movable range. Specifically, the arm portion 456 includes a rotating ball 457 and a rotating ball 458. The rotating ball 457 and the rotating ball 458 have a spherical shape.

  The display unit 460 is a unit including the point light source 310, the lens 320, the optical unit 100, and the like. The display unit 460 is disposed in front of the eyeball 11 of the user 10 in a state where the annular member 410 is mounted on the head of the user 10.

  As the optical unit 100, the optical unit according to any of the first to eighth embodiments described above can be used. In addition, in FIG.12 (b), the optical unit which concerns on 8th Embodiment mentioned above is illustrated.

  As described above, the head-mounted display device 20 is supported at four points by the occipital region 15 of the user 10, the nose of the user 10, and the bases of both ears of the user 10. Therefore, even if the display unit 460 has a certain amount of weight, the display unit 460 is prevented from being displaced from the front of the eyeball 11 of the user 10.

  The arm portion 453 is rotatably supported by the annular member 410 (attachment 451) by the rotating ball 454, and the arm portion 456 is rotatably supported by the arm portion 453 by the rotating ball 457. The display unit 460 is rotatably supported by the connecting member 450 (mounting tool 452) by a rotating ball 458. Therefore, the position of the display unit 460 can be finely adjusted so that the display unit 460 is arranged in front of the eyeball 11 of the user 10.

[Eleventh embodiment]
The eleventh embodiment will be described below with reference to FIG. FIG. 14 is a diagram showing a video display system including the head mounted display device 20.

  As shown in FIG. 14, in the video display system, a video control BOX 500 is connected to the head mounted display device 20 described above.

  The video control BOX 500 includes an input IF 510, a video signal processing circuit 520, an output IF 530, an operation IF 540, a battery 550, a rectifier circuit 560, and a switch 570.

  The input IF 510 receives a video input signal input from an external device (for example, the camera 600 or the television 700).

  The video signal processing circuit 520 converts the video input signal into a video output signal. Specifically, the video signal processing circuit 520 converts the video input signal into a video output signal applicable to the head mounted display device 20.

  For example, the video signal processing circuit 520 includes a γ correction circuit, a signal conversion circuit, a decoding circuit, and the like. The γ correction circuit is a circuit that converts a video input signal into a video output signal in accordance with a γ curve determined according to the liquid crystal panel 110 provided in the head mounted display device 20. The signal conversion circuit is, for example, a circuit that converts RGB signals into component signals, a circuit that converts component signals into RGB signals, or a YC separation circuit. The decoding circuit is a circuit that performs decoding of a video input signal in accordance with MPEG2 or MPEG4 defined in MPEG (Moving Picture Experts Group).

  The output IF 530 outputs the video output signal converted by the video signal processing circuit 520 to the head mounted display device 20.

  The operation IF 540 is a human interface configured by operation buttons and the like. For example, the user 10 can perform fast forward of the video, stop of the video, rewind of the video, color / monochrome switching, black and white inversion, and the like by an operation on the operation IF 540.

  The battery 550 is a battery configured to be able to store power to be supplied to the display unit 460 and the video control BOX 500. The rectifier circuit 560 is a circuit that rectifies AC power into DC power.

  The switch 570 switches a power source that supplies power to the display unit 460 and the video control BOX 500. For example, the switch 570 connects the rectifier circuit 560 to the display unit 460 and the video control BOX 500 when AC power can be acquired. On the other hand, the switch 570 connects the battery 550 to the display unit 460 and the video control BOX 500 when AC power cannot be acquired. The switch 570 may switch the power supply according to the operation of the user 10.

[Other Embodiments]
Although the present invention has been described with reference to the above-described embodiments, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  For example, as shown in FIG. 15, the head mounted display device 20 includes a camera 600 in front of the eyeball 11 of the user 10. The camera 600 is provided in the display unit 460. As the camera 600, a small camera such as a CCD camera is preferably used. It is preferable that the camera 600 is provided on the line of sight of the user 10. The display unit 460 preferably supports the camera 600 so as to be rotatable so that it can be applied to visually impaired persons such as strabismus. In this case, the display unit 460 (the liquid crystal panel 110) is provided in the direction in which the user's pupil is facing, and the display unit 460 moves the camera 600 in the direction in which the user's face is facing. It is preferable to support.

  In the embodiment described above, the point light source 310 is exemplified as the light source for irradiating the liquid crystal panel 110 with light, but the present invention is not limited to this. Specifically, as shown in FIG. 16, a surface light source 330 may be used as a light source for irradiating the liquid crystal panel 110 with light. In such a case, the surface light source 330 preferably emits parallel light. As a result, the distance between the surface light source 330 and the liquid crystal panel 110 can be shortened, and the display unit 460 can be downsized.

  In the embodiment described above, the head mounted display device 20 includes the display unit 460 corresponding to only one eye, but is not limited thereto. Specifically, as shown in FIG. 17A, the head mounted display device 20 includes a pair of display units 460 (display unit 460a and display unit 460b) corresponding to both eyes. Also good. As shown in FIG. 17B, the head mounted display device 20 may include a camera 600 in addition to the display unit 460a and the display unit 460b. In such a case, the camera 600 is preferably disposed on the nose of the user 10. The camera 600 may be supported by an annular member 410 provided in the head mounted display device 20.

  The combination of the configuration from the liquid crystal panel 110 to the aperture unit 130 and the configuration from the aperture unit 130 to the eyepiece lens 200 is not limited to the configuration shown in the eighth embodiment. Specifically, the optical unit 100 has the configuration shown in FIG. 6 with respect to the configuration from the liquid crystal panel 110 to the diaphragm 130, and the configuration from the diaphragm 130 to the eyepiece 200 is shown in FIG. You may have the structure shown.

  The optical unit 100 has the configuration shown in FIG. 7 with respect to the configuration from the liquid crystal panel 110 to the aperture unit 130, and the configuration from the aperture unit 130 to the eyepiece 200 has the configuration shown in FIG. You may do it. The optical unit 100 has the configuration shown in FIG. 7 with respect to the configuration from the liquid crystal panel 110 to the aperture unit 130, and the configuration from the aperture unit 130 to the eyepiece 200 has the configuration shown in FIG. You may do it.

  In the above-described embodiment, the type of light source that irradiates light to the liquid crystal panel 110 is not particularly mentioned, but an LED (Light Emitting Diode), an LD (Laser Diode), or the like can be used as a light source.

  In the embodiment described above, the liquid crystal panel 110 has been described as an example of the light modulation element, but the present invention is not limited to this.

  In the embodiment described above, the configuration from the light source to the liquid crystal panel 110 is not particularly mentioned, but an optical member that aligns the polarization direction of the light emitted from the light source and an optical member that homogenizes the light emitted from the light source may be provided. Of course.

It is a figure which shows the outline of the head mounted display apparatus 20 which concerns on 1st Embodiment. It is a figure which shows the structure of the optical unit 100 which concerns on 1st Embodiment. It is a figure which shows the structure of the optical unit 100 which concerns on 2nd Embodiment. It is a figure which shows the structure of the optical unit 100 which concerns on 3rd Embodiment. It is a figure which shows the structure of the optical unit 100 which concerns on 4th Embodiment. It is a figure which shows the structure of the optical unit 100 which concerns on 5th Embodiment. It is a figure which shows the structure of the optical unit 100 which concerns on 6th Embodiment. It is a figure which shows the structure of the optical unit 100 which concerns on 7th Embodiment. It is a figure which shows the structure of the optical unit 100 which concerns on 8th Embodiment. It is a figure for demonstrating the comparative example which concerns on 9th Embodiment. It is a figure for demonstrating the Example which concerns on 9th Embodiment. It is a figure which shows the structure of the head mounted display apparatus 20 which concerns on 10th Embodiment. It is a figure which shows the structure of the connection member 450 which concerns on 10th Embodiment. It is a figure which shows the structure of the video control BOX500 which concerns on 11th Embodiment. It is a figure which shows the structure of the display unit 460 which concerns on other embodiment. It is a figure which shows the structure of the display unit 460 which concerns on other embodiment. It is a figure which shows the structure of the display unit 460 which concerns on other embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... User, 11 ... Eyeball, 12 ... Pupil, 20 ... Head mounted display apparatus, 100 ... Optical unit, 110 ... Liquid crystal panel, 120 ... Condensing lens, 130: Diaphragm part, 131: Pinhole, 140: PBS film, 150: 1 / 4λ phase plate, 160 ... Concave mirror, 170 ... 1 / 4λ phase plate, 180 ... reflecting mirror, 200 ... eyepiece, 210 ... PBS film, 220 ... 1 / 4λ phase plate, 230 ... concave mirror, 240 ... 1 / 4λ phase plate, 250 ... minimal mirror, 3310 ... point light source, 320 ... lens, 330 ... surface light source, 410 ... annular member, 410a ... inner surface, 420 ... adjuster, 430 ...・ Nose pad, 440 ... Ear pad, 45 ... Connecting member, 451 ... Mounting tool, 452 ... Mounting tool, 453 ... Arm part, 454 ... Rotating ball, 455 ... Ball support part, 456 ... Arm part, 457 ... Rotating ball, 458 ... Rotating ball, 460 ... Display unit, 500 ... Video control BOX, 510 ... Input IF, 520 ... Video signal processing circuit, 530 ... Output IF 540 ... Operation IF, 550 ... Battery, 560 ... Rectifier circuit, 570 ... Switch, 600 ... Camera, 700 ... TV

Claims (11)

A light modulation element for emitting image light;
A diaphragm having an aperture at a focal position where the image light emitted from the light modulation element is collected;
A first PBS film having an inclination of about 45 ° with respect to the optical axis of the image light passing through the opening;
A first phase plate having an inclination of approximately 90 ° with respect to the optical axis of the image light passing through the opening and converting the polarization state of the image light passing through the opening from linearly polarized light to circularly polarized light When,
A first concave mirror that reflects the image light transmitted through the first retardation plate toward the first retardation plate;
An optical unit comprising: an eyepiece that focuses the image light reflected by the first concave mirror on an eyeball.   2. The eyepiece lens according to claim 1, wherein the eyepiece lens is provided at a position facing the first concave mirror across the first PBS film when the image light passing through the opening is S-polarized light. Optical unit.   2. The eyepiece lens according to claim 1, wherein the eyepiece lens is provided on the same side as the first concave mirror with the first PBS film as a boundary when the image light passing through the opening is P-polarized light. Optical unit. When the image light passing through the opening is S-polarized light, the polarization of the image light that is provided at a position facing the first concave mirror across the first PBS film and transmitted through the first PBS film A second retardation plate for converting the state from linearly polarized light to circularly polarized light;
A reflection mirror that reflects the image light transmitted through the second retardation plate toward the second retardation plate;
2. The optical unit according to claim 1, wherein the eyepiece is provided on the same side as the reflection mirror with the first PBS film as a boundary when the image light passing through the opening is S-polarized light. . When the image light passing through the opening is P-polarized light, the polarization of the image light reflected on the first PBS film is provided on the same side as the first concave mirror with the first PBS film as a boundary. A second retardation plate for converting the state from linearly polarized light to circularly polarized light;
A reflection mirror that reflects the image light transmitted through the second retardation plate toward the second retardation plate;
2. The optical device according to claim 1, wherein the eyepiece lens is provided at a position facing the reflection mirror across the first PBS film when the image light passing through the opening is P-polarized light. unit. A second PBS film having an inclination of approximately 45 ° with respect to the optical axis of the image light emitted from the light modulation element;
A third retardation plate for converting the polarization state of the image light reflected by the second PBS film or the image light transmitted through the second PBS film from linearly polarized light to circularly polarized light;
A second concave mirror that reflects the image light transmitted through the third retardation plate to the third retardation plate side;
The optical unit according to claim 1, wherein the second concave mirror condenses the image light on the opening. A head-mounted display device mounted on a user's head,
An annular member having an annular shape and mounted on the user's head;
An adjustment tool that is provided on the annular member on the back of the user and adjusts a gap formed between the back of the user and the inner surface of the annular member;
A nose pad that is provided on the annular member on the frontal side of the user and pressed against the user's nose;
A display unit provided in front of the user's eyeball;
Provided on the annular member on the user's frontal side, comprising a connecting member for connecting the annular member and the display unit;
The display unit is
A light modulation element for emitting image light;
A light source for irradiating the light modulation element with light;
A diaphragm having an aperture at a focal position where the image light emitted from the light modulation element is collected;
A first PBS film having an inclination of about 45 ° with respect to the optical axis of the image light passing through the opening;
A first phase plate having an inclination of approximately 90 ° with respect to the optical axis of the image light passing through the opening and converting the polarization state of the image light passing through the opening from linearly polarized light to circularly polarized light When,
A first concave mirror that reflects the image light transmitted through the first retardation plate toward the first retardation plate;
A head-mounted display device comprising: an eyepiece for condensing the image light reflected by the first concave mirror on an eyeball.   The head-mounted display device according to claim 7, further comprising an ear pad that is provided downward from the annular member on a user's temporal side and is pressed against a base of the user's ear. The connecting member has a first arm portion provided on the annular member side and a second arm portion provided on the display unit side,
The head-mounted display device according to claim 7, wherein the first arm unit rotatably supports the second arm unit.   The head-mounted display device according to claim 9, wherein the annular member rotatably supports the first arm portion.   The head-mounted display device according to claim 9, wherein the second arm unit rotatably supports the display unit.

Images