Virtual image display device and optical unit

Abstract

To prevent an optical system from becoming large as a whole.SOLUTION: Each of the virtual image display devices 100A and 100B of the direct virtual image type includes the display device 11, the first lens 30 on which the image light ML from the display device 11 is incident, the angle suppressing member AS disposed on the emission side of the first lens 30, the first prism 41 on which the image light ML passing through the first lens 30 is incident, the second prism 42 joined to the first prism 41, and the joining portion between the first prism 41 and the second prism 42. An oblique mirror unit IM that reflects at least a part of the image light ML guided in the first prism 41, a plano-convex second lens 53 that is disposed to face the outer surface 41c of the first prism 41, a transmissive mirror 56 that is formed on the convex surface 53g of the second lens 53 and partially reflects the image light ML, and a quarter-wave plate 51 that is disposed between the outer surface 41c of the first prism 41 and the flat surface 53f of the second lens 53 are provided.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a virtual image display device and an optical unit that enable viewing of a virtual image. [Background technology]

[0002] A head-mounted display comprising a display device, a projection optical member, a prism member, and a focusing reflective surface, in which image light from the projection optical member enters a first prism of the prism member, is totally reflected by the outer surface, is partially reflected by a semi-transmissive reflective surface formed at the boundary between the first and second prisms of the prism member, then passes through the outer surface of the prism member, is reflected by the focusing reflective surface, is returned to the prism member, passes through the semi-transmissive reflective surface, and further passes through the inner surface facing the pupil, is known (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2020-08749 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-described head-mounted display, an intermediate image is formed in the first prism, which increases the optical path length and causes the overall size of the optical system to increase. [Means for solving the problem]

[0005] A direct virtual image type virtual image display device according to one aspect of the present invention comprises a display element that emits image light, a first lens into which the image light from the display element is incident, an angle suppression member arranged on the exit side of the first lens, a first prism into which the image light that has passed through the first lens is incident, a second prism that is joined to the first prism to form a parallel plate-shaped prism light-guiding member, an oblique mirror section that is provided at the joint between the first prism and the second prism and that reflects at least a portion of the image light guided in the first prism, a plano-convex second lens that is arranged opposite the outer surface of the first prism onto which the image light reflected by the oblique mirror section is incident, a transmissive mirror that is formed on the convex surface of the second lens and that partially reflects the image light reflected by the oblique mirror section toward the oblique mirror section, and a quarter-wave plate that is arranged between the outer surface of the first prism and the plane of the second lens.

[0006] A direct virtual image type optical unit in one aspect of the present invention comprises a first lens onto which image light from a display element that emits image light is incident, an angle suppression member arranged on the exit side of the first lens, a first prism onto which the image light that has passed through the first lens is incident, a second prism that is joined to the first prism to form a parallel plate-shaped prism light-guiding member, an oblique mirror section provided at the joint between the first prism and the second prism and that reflects at least a portion of the image light guided in the first prism, a plano-convex second lens arranged opposite to the outer surface of the first prism onto which the image light reflected by the oblique mirror section is incident, a transmissive mirror formed on the convex surface of the second lens and that partially reflects the image light reflected by the oblique mirror section toward the oblique mirror section, and a quarter-wave plate arranged between the outer surface of the first prism and the plane of the second lens. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is an external view illustrating a state in which the virtual image display device of the first embodiment is used. [Figure 2] FIG. 2 is a side cross-sectional view illustrating the internal structure of one of the virtual image display devices. [Figure 3] 3A and 3B are diagrams illustrating the shapes of a first image-forming element and a first lens, etc. FIG. [Figure 4] FIG. 10 is a conceptual perspective view illustrating an angle suppression member. [Figure 5] 10A and 10B are diagrams illustrating modified examples of the angle suppression member. [Figure 6] 10A and 10B are diagrams illustrating another modified example of the angle suppression member. [Figure 7] 10A and 10B are diagrams illustrating dimensions of the repeating structure of the angle suppression member. [Figure 8] FIG. 2 is a perspective view illustrating the external structure of a first display unit. [Figure 9] 10A and 10B are diagrams illustrating stray light caused by unexpected reflection. [Figure 10] 10A and 10B are diagrams illustrating another type of stray light caused by unexpected reflection. [Figure 11] 10A and 10B are perspective views illustrating an example of the structure and assembly of a first display unit. [Figure 12] FIG. 10 is a side cross-sectional view illustrating a virtual image display device according to a second embodiment. [Figure 13] FIG. 13 is a conceptual perspective view illustrating the angle suppression member shown in FIG. 12. [Figure 14] 13 is a diagram illustrating dimensions of the repeating structure of the angle suppression member shown in FIG. 12. FIG. [Figure 15] 10A and 10B are diagrams illustrating an angle suppression member according to a third embodiment. [Figure 16] 10A and 10B are diagrams illustrating an angle suppression member according to a fourth embodiment. [Figure 17] 17A and 17B are diagrams illustrating a modified example of the angle suppression member shown in FIG. 16. [Figure 18] FIG. 10 is a diagram illustrating a modified example of the virtual image display device. DETAILED DESCRIPTION OF THE INVENTION

[0008] [First embodiment] Hereinafter, a first embodiment of a virtual image display device and the like according to the present invention will be described with reference to FIGS.

[0009] Fig. 1 is a diagram illustrating the wearing state of a head-mounted virtual image display device (hereinafter also referred to as a head-mounted display or HMD) 200, in which the HMD 200 allows an observer or wearer US wearing the device to recognize an image as a virtual image. In Fig. 1 and other figures, X, Y, and Z are Cartesian coordinate systems, with the +X direction corresponding to the lateral direction in which the eyes EY of the observer or wearer US wearing the HMD 200 are aligned, the +Y direction corresponding to the upward direction perpendicular to the lateral direction in which the eyes EY are aligned for the wearer US, and the +Z direction corresponding to the forward or front direction for the wearer US. The ±Y directions are parallel to the vertical axis or vertical direction.

[0010] The HMD 200 includes a first virtual image display device 100A for the right eye and a direct virtual image type, a second virtual image display device 100B for the left eye and a direct virtual image type, a pair of temple-shaped support devices 100C that support the virtual image display devices 100A and 100B, and a user terminal 90 that serves as an information terminal. The first virtual image display device 100A functions independently as an HMD and is composed of a first display driver 102a disposed at the top and a first combiner 103a shaped like a pair of glasses that covers the eyes. The second virtual image display device 100B similarly functions independently as an HMD and is composed of a second display driver 102b disposed at the top and a second combiner 103b shaped like a pair of glasses that covers the eyes. The support device 100C is a mounting member worn on the head of the wearer US and supports the upper ends of the pair of combiners 103a and 103b via the display drivers 102a and 102b that appear integrated in appearance. The first virtual image display device 100A and the second virtual image display device 100B are optically identical or are left-right reversed versions of each other, and a detailed description of the second virtual image display device 100B will be omitted.

[0011] FIG. 2 is a side cross-sectional view illustrating the internal structure of the first virtual image display device 100A. The first virtual image display device 100A includes a first image forming element 11a, a first display unit 20a, and a first circuit member 80a. The first image forming element 11a is also referred to as a display element 11. The first display unit 20a is an imaging optical system IS that directly forms a virtual image without forming an intermediate image, and is also referred to as a direct virtual image optical system DIS. The imaging optical system IS includes a first lens 30, an angle suppression member AS, a first flat plate-shaped member 40, and a second flat plate-shaped member 50. The first lens 30 functions as a protective glass that protects the display surface 11d of the display element 11. A cover glass may be provided between the display element 11 and the first lens 30. The angle suppression member AS limits the incident angle or optical path of the image light ML guided through the first flat plate-shaped member 40. Specifically, the angle suppression member AS blocks or absorbs light rays of the image light ML that are reflected an unexpected number of times within the prism light-guiding member 48, and limits the light rays to those that are internally reflected twice by the first prism 41. The first flat plate-shaped member 40 guides the image light ML emitted from the display element 11 to the second lens 53 of the second flat plate-shaped member 50. The second flat plate-shaped member 50 reflects the image light ML from the first flat plate-shaped member 40 toward the pupil position PP or the eye EY by partially returning the image light ML from the first flat plate-shaped member 40 back to the first flat plate-shaped member 40, and allows external light OL to be incident on the pupil position PP via the first flat plate-shaped member 40. The first lens 30, the first flat plate-shaped member 40, and the second flat plate-shaped member 50 each function as a lens having positive refractive power.

[0012] Although detailed description will be omitted, the second virtual image display device 100B includes a second image forming element 11b, a second display unit 20b, and a second circuit member 80b. The second image forming element 11b is similar to the first image forming element 11a, the second display unit 20b is similar to the first display unit 20a, and the second circuit member 80b is similar to the first circuit member 80a.

[0013] In the first virtual image display device 100A, the first image forming element 11a is a self-luminous image light generating device. The first image forming element 11a emits video light ML to the first flat plate-like member 40 via the first lens 30. The first image forming element 11a is housed and supported in a case 71. The first image forming element 11a is, for example, an organic EL (organic electroluminescence) display, and forms color still or moving images on a two-dimensional display surface 11d. The first image forming element 11a is driven by a first circuit member 80a to perform a display operation. The first image forming element 11a is not limited to an organic EL display, and can be replaced with a display device using an inorganic EL, an organic LED, an LED array, a laser array, a quantum dot light-emitting element, or the like. The first image forming element 11a is not limited to a self-luminous image light generating device, and may be composed of an LCD or other light modulation element, and an image may be formed by illuminating the light modulation element with a light source such as a backlight. Instead of an LCD, LCOS (Liquid Crystal on Silicon, LCoS is a registered trademark) or the like can be used as the first image forming element 11a. In the first virtual image display device 100A, the optical device excluding the first circuit member 80a is called an optical unit 100. The optical unit 100 includes a direct virtual image type optical system, and can be said to be a part corresponding to the direct virtual image optical system DIS that constitutes the first virtual image display device 100A.

[0014] The first display unit 20a includes a first lens 30, an angle suppression member AS, a first flat plate-shaped member 40, an inclined mirror unit IM, and a second flat plate-shaped member 50. In the first display unit 20a, the first lens 30 has positive refractive power and receives the image light ML from the first image forming element 11a. The first lens 30 has a flat light incident surface 30f bonded to the first image forming element 11a and a convex light exit surface 30g. The light exit surface 30g is, for example, spherical, but can also be an aspherical surface with an axisymmetric shape. The first lens 30 can be divided into a parallel plate 31 and a lens unit 32. By ensuring that the parallel plate 31 has a predetermined thickness or more, foreign matter adhering to the surface of the first lens 30 becomes less noticeable. The parallel plate 31 functions as a cover glass. The lens unit 32 is a plano-convex lens with positive refractive power. The plano-convex lens has one surface that is flat and the other surface that is convex. The parallel plate 31 and the lens portion 32 may be bonded together or may be spaced apart. The lens portion 32 does not have to be a plano-convex lens, and may be, for example, a biconvex lens. The first lens 30 is made of, for example, fused silica, and has a relatively low refractive index.

[0015] Fig. 3 is a diagram illustrating the shapes of the first image forming element 11a and the first lens 30. In Fig. 3, area AR1 shows the first lens 30 and the like when viewed obliquely upward from the front +Z side, area AR2 shows the first lens 30 and the like when viewed obliquely forward from the lower -Y side, and area AR3 shows the first lens 30 and the like when viewed from the side +X side.

[0016] Returning to FIG. 2, the first flat-plate member 40 has a first prism 41 and a second prism 42, each of which is a parallel flat plate. The first prism 41 and the second prism 42 are joined at inclined surfaces 41d and 42d. The first prism 41 and the second prism 42 joined together are called a prism light-guiding member 48. The prism light-guiding member 48 has the appearance of a parallel flat plate. A flat oblique mirror portion IM is formed on the inclined surface 41d formed on the underside of the first prism 41. The combination of the prism light-guiding member 48 and a second flat-plate member 50, which will be described later, corresponds to the first combiner 103a in FIG. 1.

[0017] The first prism 41 has a rectangular prism-like outer shape and a trapezoidal cross section. The first prism 41 guides the image light ML and has an incident optical surface 41a, an inner surface 41b, an outer surface 41c, and an inclined surface 41d. The first prism 41 also has an upper flat surface 40u (described later) and a portion of a horizontal flat surface 40v (see FIG. 8, etc.). The incident optical surface 41a is generally inclined downward in the front direction, and the optical axis passing through the incident optical surface 41a extends in a direction between the +Z direction (forward) and the +Y direction (upward). This makes it easier to position the first image forming element 11a (the display element 11) closer to the outside world than the inner surface 41b, and allows the angle at which the image light ML propagates within the first prism 41 (inside the first prism 41 or inside the first prism 41) to be adjusted. The incident optical surface 41a is a convex surface, e.g., a spherical surface, but may also be an axially symmetric aspherical surface. The first prism 41 can be considered to have a lens portion 44 including an incident optical surface 41a. The lens portion 44 is a convex-plano lens having positive refractive power. The lens portion 44 may be formed directly on the first prism 41 or may be bonded to the first prism 41. The inner surface 41b and the outer surface 41c are parallel to each other and extend perpendicular to the optical axis AX between the first prism 41 and the pupil position PP. The inner surface 41b and the outer surface 41c internally reflect the image light ML (i.e., reflect it inside the object surface), and it is particularly desirable for them to totally reflect the image light ML. The inner surface 41b can be hard-coated to improve scratch resistance or abrasion resistance. The inclined surface 41d is flat. The inclined surface 41d forms an acute angle with the outer surface 41c, specifically an angle of 25° to 32°. The distance between the optical axis AX passing through the pupil position PP and the upper end of the first lens 30 is approximately 20 mm. The first prism 41 is made of a resin material.

[0018] The number of reflections of the image light ML in the first prism 41 is once on the inner surface 41b, once on the outer surface 41c, and once on the inclined mirror portion IM (described later). By setting the number of internal reflections of the image light ML in the first prism 41 to two, it is possible to increase the angle of view of the image light ML, the pupil position PP, or its aperture PPa, while avoiding the mixing of light that has been reflected a different number of times within the first prism 41.

[0019] Like the first prism 41, the second prism 42 has a rectangular prism-like outer shape and a trapezoidal longitudinal cross section. The second prism 42 transmits the image light ML and has an inner surface 42b, an outer surface 42c, and an inclined surface 42d. The second prism 42 also has a portion of a horizontal plane 40v (described later) and a lower plane 40w (see FIG. 8, etc.). The inner surface 42b and the outer surface 42c are parallel to each other and extend perpendicular to the optical axis AX between the pupil position PP. The inner surface 42b can be hard-coated to improve scratch resistance. The second prism 42 is formed of a resin material.

[0020] The inclined mirror portion IM reflects at least a portion of the image light ML guided through the first prism 41. The inclined mirror portion IM is integrally formed on the inclined surface 41d of the first prism 41 and is sandwiched between the inclined surface 41d of the first prism 41 and the inclined surface 42d of the second prism 42. A bonding adhesive CT is filled between the inclined mirror portion IM and the inclined surface 42d. The inclined mirror portion IM and the inclined surface 42d may be bonded not only with the adhesive CT but also with an adhesive film or the like. In this embodiment, the inclined mirror portion IM is a polarization separation film 45. The polarization separation film 45 is formed of a dielectric multilayer film. When the image light ML contains s-polarized light s, the polarization separation film 45 efficiently reflects the s-polarized light s of the image light ML, and when the image light ML contains p-polarized light p, the polarization separation film 45 efficiently transmits the p-polarized light p of the image light ML. The polarization separation film 45 may be any film that selectively reflects the image light ML in accordance with the polarization direction, and may be, for example, a wire grid polarizer or a reflective polarization element that utilizes film stretching.

[0021] The polarization splitting film 45 may transmit s-polarized light s and reflect p-polarized light p.

[0022] The inclined mirror portion IM may have a flat surface that does not affect image formation. The inclined mirror portion IM may also have a slightly convex or concave curved surface that does not affect image formation. The space between the inclined mirror portion IM and the inclined surface 41d may be filled with a light-transmitting filler instead of adhesive CT. In this case, the first prism 41 and the second prism 42 may be supported from the outside by a support member or the like to maintain their bonded state. The inclined mirror portion IM may also be integrally formed on the inclined surface 42d of the second prism 42, instead of on the inclined surface 41d of the first prism 41. The scratch or abrasion resistance of the inclined mirror portion IM can be improved by applying a hard coating to the surface.

[0023] FIG. 4 is a conceptual perspective view illustrating the angle suppression member AS. The coordinates x, y, and z shown in FIGS. 2 and 4 are local coordinates of the angle suppression member AS. The x-axis of the local coordinate system substantially coincides with the x-axis of the global coordinate system. The angle suppression member AS controls the angle of light intersecting with the x-axis, which is perpendicular to the longitudinal cross section of the prism light-guiding member 48. The longitudinal cross section of the prism light-guiding member 48 is a cross section in the short direction of the incident optical surface 41a of the prism light-guiding member 48. In this embodiment, the angle suppression member AS is disposed on the exit side of the first lens 30, specifically between the first lens 30 and the first prism 41. As a result, the angle suppression member AS limits the incident angle of the image light ML incident on the first prism 41. The angle suppression member AS may be disposed between the first prism 41 and the display element 11. However, the pitch of the repeating structure KS (described later) becomes smaller as the angle suppression member AS approaches the display element 11, which can cause diffraction and manufacturing issues. For this reason, it is desirable to place the angle suppression member AS near the first prism 41. The angle suppression member AS blocks or absorbs light that has a predetermined angle with respect to the optical axis AX, that is, light that has a predetermined incident angle. This light that has a predetermined incident angle is light that has been reflected an unexpected number of times within the prism light-guiding member 48, and can cause stray light.

[0024] The size of the angle suppression member AS corresponds to the first lens, and is the same as or approximately the same as the size of the first lens 30. The tilt angle of the angle suppression member AS corresponds to the first lens 30 or the lens portion 44 of the first prism 41, and is the same as or approximately the same as the tilt angle of the first lens 30 or the tilt angle of the lens portion 44 of the first prism 41. In other words, the angle suppression member AS is aligned with the first lens 30 or the lens portion 44 of the first prism 41. This makes it easier for the angle suppression member AS to adjust the angle of incidence of the image light ML that enters the first prism 41.

[0025] The angle suppression member AS is a plate-like or film-like member having a light-blocking repeating structure KS extending in a predetermined direction. The repeating structure KS is formed by alternatingly arranging transmission regions K1 or light-transmitting layers that transmit the image light ML and light-blocking regions K2 or light-blocking layers that block or absorb the image light ML at a predetermined incident angle. Specifically, the angle suppression member AS is a louver member RM or louver-like film in which a plurality of elongated blades or blade-like members are arranged in parallel or approximately parallel. The repeating structure KS may have two or more light-blocking regions K2 in the angle suppression member AS so as to block or absorb the image light ML at a predetermined incident angle.

[0026] In this embodiment, the light-shielding regions K2 extend in the x direction of the local coordinate system. The x direction is a direction perpendicular to the cross section of the prism light-guiding member 48 or the first prism 41. The light-shielding regions K2 are arranged as a repeating structure KS at a predetermined pitch P and a predetermined height T. By adjusting the pitch P and height T of the repeating structure KS, it is possible to appropriately block or absorb light rays at angles that cause stray light to occur in the image light ML. The light-shielding regions K2 may be inclined with respect to the surface of the angle suppression member AS. The pitch P of the light-shielding regions K2 may be uniform or may have a predetermined pattern. The height T of the light-shielding regions K2 may be the same as or smaller than the thickness of the angle suppression member AS or the transmissive region K1.

[0027] The light-shielding region K2 is a light-shielding body SK that is rectangular in cross section. This simplifies the design of the repeating structure KS. The shape of the light-shielding body SK can be modified as appropriate. For example, as shown in Figures 5 and 6, the light-shielding region K2 may be a light-shielding body SK that is trapezoidal, triangular, or other shapes in cross section. The light-shielding body SK may be made of, for example, carbon nanoblack, an anti-reflective material, or a black-colored resin. The transparent region K1 is formed of a transparent film or resin. The angle suppression member AS may be formed by, for example, forming equally spaced grooves on the surface of a light-transmitting plate-like or sheet member and pouring the material for the light-shielding body SK into the grooves, or by using a printing technique such as inkjet printing. The angle suppression member AS may also be formed by alternately arranging transparent silicone rubber and black silicone and sandwiching them between polycarbonate films or the like. The surface of the angle suppression member AS may be coated with a hard coat, an anti-reflective coating, or the like. The angle suppression member AS may be formed by attaching an angle control film, a viewing angle control film, or the like to the light exit surface 30g of the first lens 30 or the incident optical surface 41a of the first prism 41.

[0028] 7 is a diagram illustrating the dimensions of the repeating structure KS of the angle suppression member AS. The repeating structure KS is determined by the minimum incident angle α of the light to be blocked from the image light ML, and the height T or pitch P of the light blocking region K2 or light blocking body SK. The relationship between the incident angle α, height T, and pitch P can be expressed by the following equation. tan α=P / T The repeating structure KS determines the minimum incident angle α of light to be blocked, and the height T or pitch P is determined, which inevitably determines the pitch P or height T. In this embodiment, the height T and pitch P of the repeating structure KS, i.e., the light-shielding regions K2 or light-shielding bodies SK, are approximately constant. For example, when the repeating structure KS blocks light rays with an incident angle α of 18° or more, the height T of the light-shielding regions K2 or light-shielding bodies SK is approximately 50 μm, and the pitch P of the light-shielding regions K2 or light-shielding bodies SK is approximately 16.25 μm.

[0029] 2, the second flat member 50 has a thin quarter-wave plate 51 and a cover member 52. The quarter-wave plate 51 is a crystal or the like having an optical axis between the X direction and the Y direction, and converts the s-polarized image light ML reflected by the polarization separation film 45 into circularly polarized light c, and converts the circularly polarized image light ML reflected by the cover member 52 into p-polarized light p. The cover member 52 has a plano-convex second lens 53, a concave-plano compensating lens 54, a compensating plate 55 provided around the compensating lens 54 and extending parallel to the prism light-guiding member 48, and a transmissive mirror 56.

[0030] The second flat plate-shaped member 50 is disposed at a distance of approximately 20 μm to 50 μm from the first flat plate-shaped member 40. The outer surfaces 41 c, 42 c of the first flat plate-shaped member 40 and the inner surface 50 c of the second flat plate-shaped member 50 may be slightly curved, which may result in a small step at the boundary between the outer surfaces 41 c, 42 c. However, by setting the distance between the outer surfaces 41 c, 42 c and the inner surface 50 c to 20 μm or more, more preferably 30 μm or more, it is possible to prevent these surfaces from being too close to each other. Conversely, by setting the distance between the outer surfaces 41 c, 42 c and the inner surface 50 c to 50 μm or less, it is possible to prevent an increase in the thickness of the first combiner 103 a formed by combining the first flat plate-shaped member 40 and the second flat plate-shaped member 50. Spacers 61 are provided between the outer surfaces 41c, 42c of the first flat plate member 40 and the inner surface 50c of the second flat plate member 50 to adjust the gap between the first flat plate member 40 and the second flat plate member 50 and fix them in a mutually positioned state. The spacers 61 are not provided around the entire periphery of the second flat plate member 50. In other words, the gap SP between the first flat plate member 40 and the second flat plate member 50 is not sealed and is in communication with the outside world.

[0031] In the cover member 52, the second lens 53 is thin but has positive refractive power. It has a flat surface 53f bonded to the quarter-wave plate 51 and a convex surface 53g facing the compensating lens 54. The convex surface 53g is, for example, spherical, but can also be an axisymmetric aspherical surface. The compensating lens 54 is thin but has positive refractive power. It has a concave surface 54f facing the second lens 53 and a flat surface 54g. The compensating plate 55 is a parallel plate and has a pair of flat surfaces 55f and 55g. The concave surface 54f of the compensating plate 55 has the same shape as the convex surface 53g of the second lens 53. The flat surface 54g of the compensating lens 54 and the flat surface 55g of the compensating plate 55 are coplanar and continuous. The transmissive mirror 56 is a thin film formed on the convex surface 53g of the second lens 53 and has the same shape as the convex surface 53g. The combination of the second lens 53 and the transmissive mirror 56 is called a light-collecting reflector CR.

[0032] The second lens 53, the compensation lens 54, and the compensation plate 55 are formed from a resin material and have the same refractive index. The refractive index of the second lens 53 etc. is lower than the refractive index of the first prism 41. The compensation lens 54 and the compensation plate 55 are an optical element 58 integrally formed from the same resin material.

[0033] The combination of the second lens 53, the compensating lens 54, and the compensating plate 55 functions as a parallel plate. In other words, external light OL incident on the compensating lens 54 or the compensating plate 55 passes through them without being affected by the lens action of the compensating lens 54 or the like or by steps present at the outer edge of the compensating lens 54. In this way, the compensating lens 54 optically compensates for the effect of the second lens 53 on the external light OL. In this sense, the plane 53f of the second lens 53, the plane 54g of the compensating lens 54, and the planes 55f and 55g of the compensating plate 55 are not necessarily limited to strict flat surfaces. For example, they may be approximately flat, or may include curved surfaces partially or entirely. Furthermore, the plane 53f of the second lens 53, the plane 54g of the compensating lens 54, and the planes 55f and 55g of the compensating plate 55 may include curved surfaces for correcting the vision of the wearer US or for design purposes such as sunglasses or fashion glasses, as long as such curved surfaces do not cause any inconvenience in terms of optical performance. The flat surfaces 54g, 55g of the compensating lens 54 and the compensating plate 55 may be coated with an anti-reflection film or a hard coat. The external light OL passing through the compensating plate 55 passes above, below, left, and right of the compensating lens 54, and is incident from a peripheral region outside the incident region of the image light ML corresponding to the compensating lens 54, that is, from the compensating plate 55. This ensures a wide see-through field of view of the outside world. The field of view of the external light OL is set to, for example, approximately 40° upward and approximately 40° downward.

[0034] The transmissive mirror 56 is a half mirror that partially reflects the image light ML that has passed through the second lens 53 and partially transmits external light OL. The transmissive mirror 56 reflects the image light ML that has been reflected by the inclined mirror portion IM of the first flat plate member 40 or the polarization separation film 45 and passed through the quarter-wave plate 51 and the second lens 53 toward the pupil position PP. The transmissive mirror 56 is a concave mirror that covers the pupil position PP where the eye EY or pupil is located and has a concave shape toward the pupil position PP and a convex shape toward the outside world. The pupil position PP or its opening PPa is called the eyepoint or eyebox, and corresponds to the exit pupil EP of the first display unit 20a.

[0035] The transmissive mirror 56 transmits a portion of the external light OL, enabling a see-through view of the external world and superimposing a virtual image on an external image. In this case, the external light OL passes through the first and second flat-plate members 40 and 50, but the flat-plate members 40 and 50 do not act as a lens on the external light OL. The reflectance of the transmissive mirror 56 for the image light ML and the external light OL is set to 10% to 50% within the expected range of incident angles of the image light ML, in order to ensure the brightness of the image light ML and facilitate the observation of the external image via see-through. The transmissive mirror 56 is formed, for example, by a dielectric multilayer film consisting of multiple dielectric layers with adjusted thicknesses. The transmissive mirror 56 may also be a single-layer or multilayer film of a metal, such as Al or Ag, with adjusted thicknesses. The transmissive mirror 56 is formed, for example, by lamination using vapor deposition.

[0036] In the first virtual image display device 100A, the first lens 30, the lens unit 44, the second lens 53, and the transmissive mirror 56 each have a positive refractive power, tending to converge divergent light. The first lens 30, the lens unit 44, the second lens 53, and the transmissive mirror 56, together with the main body of the first prism 41 and the second prism 42, function as an imaging optical system IS, similar to a simple microscope, that forms an erect image, or a direct virtual image optical system DIS. This allows a virtual image to be formed by projecting a real image formed on the display surface 11d of the first image forming element 11a, for example, at infinity, or a virtual image to be formed by projecting a real image formed on the display surface 11d several meters away. Adjusting the refractive powers of the first lens 30, the lens unit 44, the second lens 53, and the transmissive mirror 56 shortens the focal length of the imaging optical system IS, thereby achieving a desired magnification ratio.

[0037] Referring to FIG. 8 , the vertical dimension ay of the first flat plate-shaped member 40 or the second flat plate-shaped member 50 is, for example, 34 mm, and its horizontal dimension ax is, for example, 40 mm. The front-to-rear thickness az of the first flat plate-shaped member 40 is, for example, approximately 7 mm, and the combined thickness of the first flat plate-shaped member 40 and the second flat plate-shaped member 50 is limited to approximately 7.5 mm. The first flat plate-shaped member 40 has upper flat surfaces 40u on both sides of the incident optical surface 41a. Light is not incident on the upper flat surface 40u. To prevent stray light, a light shielding material (not shown) may be disposed facing and covering the upper flat surface 40u, or a light shielding material may be applied to the upper flat surface 40u. A light shielding material or the like may also be provided to cover the horizontal flat surface 40v or the lower flat surface 40w. In this embodiment, a light shielding material CS is provided on the lower flat surface 40w, which is the bottom surface of the prism light-guiding member 48 or the second prism 42. A light shield or the like may also be provided around the periphery of the second flat plate-shaped member 50 to cover it.

[0038] Returning to FIG. 2 , the optical path of the image light ML from the first image forming element 11a passes through the first lens 30 and the angle suppression member AS and enters the first prism 41. At this time, the degree of divergence of the image light ML is suppressed by the positive refractive power of the first lens 30 and the lens unit 44. Furthermore, by passing through the angle suppression member AS, light rays at a certain angle that cause stray light are blocked or absorbed. On the optical path passing through the first prism 41, the image light ML is sequentially reflected by the inner surface 41b and the outer surface 41c of the first prism 41 without forming an intermediate image, and the s-component of the image light ML is reflected by the polarization splitting film 45. The s-polarized s-polarized image light ML reflected by the polarization splitting film 45 passes through the outer surface 41c of the first prism 41 and passes through the quarter-wave plate 51 of the second flat plate-like member 50, becoming circularly polarized c light and entering the transmissive mirror 56. A portion of the circularly polarized light c image light ML incident on the transmissive mirror 56 passes through the second lens 53, is reflected by the transmissive mirror 56, and passes through the second lens 53 and the quarter-wave plate 51 again in a collimated state. As a result, the image light ML that passed through the quarter-wave plate 51 becomes p-polarized light p and enters the first prism 41 from the outer surface 41c, transmits through the polarization separation film 45, and is emitted to the outside of the second prism 42 through the inner surface 42b. The image light ML that has been emitted to the outside of the second prism 42 is incident on a pupil position PP where the eye EY or pupil of the wearer US is located. Not only the image light ML reflected by the transmissive mirror 56, but also external light OL that has passed through the transmissive mirror 56 and the compensating plate 55 are incident on the pupil position PP. In other words, the wearer US wearing the first virtual image display device 100A can observe a virtual image formed by the image light ML superimposed on an external image.

[0039] 9 and 10 are diagrams illustrating stray light caused by unexpected reflections within the prism light-guiding member 48. Because the first virtual image display device 100A is an optical system that does not include a diaphragm, when the viewing angle of the display element 11 widens, stray light reflected an unexpected number of times within the prism light-guiding member 48 may occur, potentially preventing a high-quality image from being displayed to the wearer US. As shown in FIG. 9, light L1 reflected within the first prism 41 along an unexpected or undesigned path generates stray light GL1 or ghost images below the center of the image viewed by the wearer US. This stray light GL1 can be blocked by the angle suppression member AS shown in FIG. 2 and other figures. Furthermore, as shown in FIG. 10, light L2 reflected by the lower flat surface 40w of the second prism 42 generates stray light GL2 or ghost images above the center of the image viewed by the wearer US. This stray light GL2 can be blocked by providing a light-blocking member CS on the lower flat surface 40w of the second prism 42 shown in FIG. 2 and other figures.

[0040] An example of the structure and assembly of the first display unit 20a constituting the first virtual image display device 100A will be described with reference to FIG. 11. In FIG. 11, regions BR1 to BR5 are perspective views illustrating the assembly process of the first display unit 20a. First, as shown in region BR1, a first prism 41 and a second prism 42 are prepared. The first prism 41 and the second prism 42 are formed, for example, by injection molding of resin. The first prism 41 has an incident optical surface 41a, an inner surface 41b, an outer surface 41c, etc. The second prism 42 has an inner surface 42b, an outer surface 42c, etc. A polarization separation film 45 serving as an inclined mirror unit IM is formed on the inclined surface 41d of the first prism 41 by vacuum deposition or another method. A light-shielding member CS is formed on the lower flat surface 40w of the second prism 42 by coating or another method. As shown in region BR2, the first prism 41 and the second prism 42 are joined at the inclined surfaces 41d, 42d to obtain the prism light-guiding member 48 or the first flat plate-like member 40. Next, as shown in region BR3, a quarter-wave plate 51 is attached to the outer surfaces 41c, 42c of the first flat plate-like member 40, facing the outer surfaces 41c, 42c. At this time, a pair of spacers 61 made of thin adhesive are disposed between the outer surfaces 41c, 42c of the first flat plate-like member 40 and the quarter-wave plate 51, forming a gap between the outer surfaces 41c, 42c of the first flat plate-like member 40 and the quarter-wave plate 51. As shown in region BR4, a second lens 53 is attached to an appropriate position on the surface of the quarter-wave plate 51. A transmissive mirror 56 is formed on the surface of the second lens 53. Next, as shown in region BR5, an optical element 58 is bonded to the quarter-wave plate 51 and the like. At this time, the compensating lens 54 and the second lens 53 of the optical element 58 are positioned, fitted, and bonded to each other. In addition, the compensating plate 55 and the quarter-wave plate 51 of the optical element 58 are bonded to each other. This completes the assembly of the first flat-plate member 40 and the second flat-plate member 50 of the first display unit 20a.

[0041] In the above description, the first display unit 20a is produced by assembling the second flat plate-shaped member 50 on the first flat plate-shaped member 40, but the first flat plate-shaped member 40 and the second flat plate-shaped member 50 may be assembled separately, and then the first flat plate-shaped member 40 and the second flat plate-shaped member 50 may be joined together at the end.

[0042] The direct virtual image type virtual image display devices 100A, 100B or the optical unit 100 of the first embodiment described above includes a display element 11 that emits image light ML, a first lens 30 onto which the image light ML from the display element 11 is incident, an angle suppression member AS that is arranged on the exit side of the first lens 30, a first prism 41 onto which the image light ML that has passed through the first lens 30 is incident, a second prism 42 that is joined to the first prism 41 to form a parallel plate-shaped prism light-guiding member 48, and an angle suppression member 49 that is arranged at the joint between the first prism 41 and the second prism 42. The optical system comprises an inclined mirror portion IM that reflects at least a portion of the image light ML guided through the first prism 41, a plano-convex second lens 53 that is arranged opposite the outer surface 41c of the first prism 41 onto which the image light ML reflected by the inclined mirror portion IM is incident, a transmissive mirror 56 that is formed on the convex surface 53g of the second lens 53 and that partially reflects the image light ML reflected by the inclined mirror portion IM towards the inclined mirror portion IM, and a quarter-wave plate 51 that is arranged between the outer surface 41c of the first prism 41 and the flat surface 53f of the second lens 53.

[0043] In the virtual image display devices 100A, 100B or the optical unit 100, in order to form a virtual image directly without forming an intermediate image, the first lens 30, the second lens 53, and the transmissive mirror 56 ensure refractive power, thereby ensuring a magnification while suppressing an increase in the optical path length and avoiding an increase in the size of the optical system. In addition, the inclusion of the angle suppression member AS prevents the occurrence of unwanted and unexpected reflections within the prism light-guiding member 48, thereby reducing stray light caused by unexpected reflections.

[0044] Second Embodiment The virtual image display device of the second embodiment will be described below. Note that the virtual image display device of the second embodiment is a partial modification of the virtual image display device of the first embodiment, and a description of parts common to the virtual image display device of the first embodiment will be omitted.

[0045] FIG. 12 is a side cross-sectional view illustrating the internal structure of the first virtual image display device 100A of the second embodiment. FIG. 13 is a conceptual perspective view illustrating the angle suppression member AS. The local coordinate system of the angle suppression member AS shown in FIG. 12 and other figures approximately coincides with the global coordinate system shown in FIG. 12. In the first display unit 20a of the first virtual image display device 100A, the angle suppression member AS is disposed on the pupil position PP side of the first prism 41. That is, the angle suppression member AS is provided on the inner surface 41b of the first prism 41. This makes it possible to further suppress stray light. The angle suppression member AS may be provided on the entire inner surface 41b of the first prism 41, or may be provided on a part of the inner surface 41b.

[0046] The angle suppression member AS may be a plate-like or film-like member attached to the inner surface 41b of the first prism 41, or may be formed by creating a groove when molding the first prism 41 and pouring the material of the shading region K2 or shading body SK (such as a resin with shading properties) into the groove.

[0047] FIG. 14 is a diagram illustrating the dimensions of the repeating structure KS of the angle suppression member AS. In this embodiment, the pitch P of the repeating structure KS takes into consideration reflection from the inner surface 41b of the first prism 41. As shown in FIG. 14, the allowable incident angle of the image light ML incident on the angle suppression member AS is larger than that of the image light ML incident on the angle suppression member AS of the first embodiment shown in FIG. 7. Therefore, the pitch P of the repeating structure KS shown in FIG. 14, i.e., the light-shielding region K2 or the light-shielding body SK, is wider than the pitch P shown in FIG. 7. This allows the angle suppression member AS to suppress the effects of diffraction while improving manufacturing. However, because the first prism 41 is included in the see-through portion for observing an external image, the pitch P is adjusted to a level that does not cause significant diffraction of the external light OL, which is see-through light. In the repeating structure KS, the relationship between the minimum incident angle γ of the light to be blocked from the image light ML, the height T, and the pitch P can be expressed by the following equation. tanγ=(P / 2) / T Specifically, the height T is about 50 μm, and the pitch P is about 150 μm or more.

[0048] Third Embodiment The virtual image display device of the third embodiment will be described below. Note that the virtual image display device of the third embodiment is a partial modification of the virtual image display device of the first embodiment, and a description of parts common to the virtual image display device of the first embodiment will be omitted.

[0049] FIG. 15 is a diagram illustrating an angle suppression member AS provided in the first virtual image display device 100A of the third embodiment. As shown in FIG. 15, the pitch P of the repeating structure KS of the angle suppression member AS changes depending on the location of stray light generation. The pitch P of the repeating structure KS also takes into consideration the brightness of the overall image observed by the wearer US. In this embodiment, the light-shielding region K2 of the repeating structure KS is either a triangular or trapezoidal light-shielding body SK embedded in the transmissive region K1 in a cross-sectional view. Furthermore, in the angle suppression member AS, the total area of ​​the central light-shielding region K2 is smaller than the total area of ​​the light-shielding regions K2 at both ends in a direction perpendicular to the predetermined direction in which the repeating structure KS extends.

[0050] If the light-shielding region K2 or light-shielding body SK of the repeating structure KS has a trapezoidal or triangular shape, the number of light-shielding surfaces increases, resulting in a decrease in overall image brightness. Therefore, the light-shielding region K2 is placed in a portion that blocks light caused by stray light while not significantly changing the brightness of the image. For example, if stray light occurs in approximately one-third of one side of the display element 11, the light-shielding region K2 is not placed in the center or central portion of the angle suppression member AS, but is placed only on both ends of the angle suppression member AS. With this configuration, the brightness of the center of the image does not change, and the brightness of both ends of the image gradually becomes darker. This eliminates the need to increase the brightness of the image displayed on the display element 11.

[0051] As described above, by making the shading region K2 a triangular or trapezoidal shading body SK, it is possible to easily fabricate the repeating structure KS, while suppressing shading near the center of the angle suppression member AS, where the influence of stray light is low, thereby preventing large changes in the brightness of the overall image.

[0052] [Fourth embodiment] The virtual image display device of the fourth embodiment will be described below. The virtual image display device of the third embodiment is a partial modification of the virtual image display device of the first embodiment, and a description of the parts common to the virtual image display device of the first embodiment will be omitted.

[0053] FIG. 16 is a perspective view illustrating an angle suppression member AS according to a fourth embodiment. In this embodiment, the angle suppression member AS includes a light-shielding region K2 extending in the long-side direction, which is a predetermined direction, and a light-shielding region K4 extending in the short-side direction, which is a direction perpendicular to the predetermined direction. The first virtual image display device 100A shown in FIG. 9 typically generates stray light in the vertical direction. However, if the lateral width of the prism light-guiding member 48 is short, stray light due to wall reflection or the like may also be generated. Therefore, the angle suppression member AS includes a cross structure XS in which the light-shielding regions K2 and K4 are arranged in two different directions that are perpendicular to each other. In the example shown in FIG. 16, the angle suppression member AS is formed by crossing and stacking two repeating structures KS, each having the light-shielding regions K2 and K4. As shown in FIG. 17, the angle suppression member AS may also be formed by crossing the light-shielding regions K2 and K4 in a single repeating structure KS. The light-shielding region K2 in the long-side direction and the light-shielding region K4 in the short-side direction may have the same height and pitch or different pitches.

[0054] [Variations and Others] The present invention has been described above in accordance with the embodiments, but the present invention is not limited to the above embodiments and can be implemented in various forms without departing from the spirit of the invention, and for example, the following modifications are also possible.

[0055] In the above, the HMD 200 is described as comprising a first virtual image display device 100A and a second virtual image display device 100B, but the HMD 200 may also be configured to support a single first virtual image display device 100A or second display device 100B in front of the eyes by a support device 100C.

[0056] The compensating plate 55 can be omitted from the cover member 52. In this case, the quarter-wave plate 51 is disposed only in the range of the second lens 53, and the second lens 53 is covered by the compensating lens .

[0057] In the second flat plate-shaped member 50, the cover member 52 may be omitted.

[0058] The incident optical surface 41a may be omitted from the first prism 41 of the first flat plate member 40. In this case, the optical system does not include the lens unit 44.

[0059] The first lens 30 is not limited to being bonded to the first image-forming element 11a, but may be disposed separately from the first image-forming element 11a.

[0060] The diagonal mirror portion IM may be a half mirror. The half mirror reflects and partially transmits part of the image light ML and part of the external light OL. As an example, the reflectance and transmittance of the half mirror may be 50%. The half mirror is formed, for example, of a dielectric multilayer film made up of multiple dielectric layers with adjusted film thicknesses. The half mirror may be a single-layer film or a multilayer film of a metal such as Al or Ag with adjusted film thicknesses. The half mirror is formed, for example, by lamination using vapor deposition.

[0061] As shown in FIG. 18 , the first virtual image display device 100A may include an s-polarized light transmitting polarizer 12 disposed between the first lens 30 and the display element 11 in the first display unit 20a. The first display unit 20a also includes a third flat-plate member 150 on the external side of the second flat-plate member 50. The third flat-plate member 150 is an image light blocking unit LP. The third flat-plate member 150 includes an outer quarter-wave plate 151 disposed on the external side of the transmissive mirror 56 or the light-collecting reflector CR, and a polarizer 59 disposed on the external side of the outer quarter-wave plate 151. That is, the first display unit 20a has a structure in which the inner quarter-wave plate 51 and the outer quarter-wave plate 151 are disposed between the inner polarization separation film 45 and the outer polarizer 59. The polarizer 59 selectively absorbs the image light ML transmitted through the outer quarter-wave plate 151 according to the polarization direction.

[0062] The circularly polarized image light ML that has passed through the transmissive mirror 56 becomes p-polarized light by passing through the outer quarter-wave plate 151, and then enters the polarizing plate 59, where most of it is blocked. In other words, the image light ML is blocked by the third flat plate-shaped member 150 and does not leak out. Since the image light ML is prevented from being observed from the outside, privacy is ensured. Meanwhile, the external light OL that has entered the polarizing plate 59 becomes only s-polarized light by passing through the polarizing plate 59, becomes circularly polarized light by passing through the outer quarter-wave plate 151, and is partially transmitted through the transmissive mirror 56. The circularly polarized external light OL that has partially passed through the transmissive mirror 56 becomes p-polarized light by passing through the inner quarter-wave plate 51, passes through the polarization separation film 45, and is incident on the pupil position PP (see FIG. 1).

[0063] In a specific embodiment, a direct virtual image type virtual image display device includes a display element that emits image light, a first lens into which the image light from the display element is incident, an angle suppression member arranged on the exit side of the first lens, a first prism into which the image light that has passed through the first lens is incident, a second prism that is joined to the first prism to form a parallel plate-shaped prism light-guiding member, an oblique mirror section that is provided at the joint between the first prism and the second prism and that reflects at least a portion of the image light guided in the first prism, a plano-convex second lens that is arranged opposite the outer surface of the first prism onto which the image light reflected by the oblique mirror section is incident, a transmissive mirror that is formed on the convex surface of the second lens and that partially reflects the image light reflected by the oblique mirror section toward the oblique mirror section, and a quarter-wave plate that is arranged between the outer surface of the first prism and the plane of the second lens.

[0064] In the virtual image display device, in order to directly form a virtual image without forming an intermediate image, the first lens, the second lens, and the transmissive mirror ensure refractive power, ensuring a magnification while suppressing an increase in the optical path length, and thus preventing an increase in the size of the optical system. In addition, by including an angle suppression member, it is possible to prevent the occurrence of unnecessary and unexpected reflections within the prism light-guiding member and reduce stray light caused by unexpected reflections.

[0065] In a specific aspect of the virtual image display device, the angle suppression member has a light-blocking repeated structure extending in a predetermined direction.

[0066] In a specific embodiment of the virtual image display device, the angle suppression member is a louver member in which a plurality of light-blocking blade-like members are arranged.

[0067] In a specific embodiment of the virtual image display device, the angle suppression member controls the angle of light intersecting with an axis perpendicular to the longitudinal cross section of the prism light guide member.

[0068] In a specific aspect of the virtual image display device, the angle suppression member has a size corresponding to the first lens and is disposed between the first lens and the first prism, thereby limiting the angle of incidence of the image light incident on the first prism.

[0069] In a specific aspect of the virtual image display device, the angle suppression member is disposed on the pupil position side of the first prism. In this case, by providing the angle suppression member on the inner surface of the first prism, stray light can be further suppressed.

[0070] In a specific aspect of the virtual image display device, the angle suppression member has a transmission region that transmits image light and a light-blocking region that is arranged as a repeating structure at a predetermined pitch and a predetermined height. By adjusting the pitch and height of the repeating structure, it is possible to appropriately block light rays at angles that cause stray light in the image light.

[0071] In a specific embodiment of the virtual image display device, the light-shielding region is a light-shielding body that is rectangular in cross section, which allows for a simple design of the repeating structure.

[0072] In a specific aspect of the virtual image display device, the light-shielding region is a light-shielding body that is either triangular or trapezoidal in cross section, and the angle suppression member has a central light-shielding region whose total area is smaller than the total area of ​​the light-shielding regions at both ends in a direction perpendicular to the predetermined direction in which the repeating structure extends. In this case, by making the light-shielding region a triangular or trapezoidal light-shielding body, it is possible to easily fabricate the repeating structure, while suppressing light shading near the center of the angle suppression member, where the influence of stray light is low, thereby preventing a large change in the brightness of the overall image.

[0073] In a specific embodiment of the virtual image display device, the second prism has a light blocking member on the lower plane, which can suppress stray light occurring above the center of the image.

[0074] In a specific aspect of the virtual image display device, the diagonal mirror unit includes a polarization separation film that selectively reflects image light according to its polarization direction, and the first lens, the angle suppression member, the prism light-guiding member, the polarization separation film, the second lens, the transmissive mirror, and the quarter-wave plate form a simple microscope-type imaging optical system that forms an erect image, and the first prism internally reflects the image light twice while diverging it. In this case, it is easy to shorten the distance from the display element to the transmissive mirror, making it possible to reduce the size of the prism light-guiding member, and also facilitating the miniaturization of the display element and the first lens.

[0075] In a specific embodiment of the virtual image display device, the first lens has a flat light entrance surface that is bonded to the display element, and a convex light exit surface.

[0076] In a specific embodiment, a direct virtual image type optical unit includes a first lens onto which image light from a display element that emits image light is incident, an angle suppression member arranged on the exit side of the first lens, a first prism onto which image light that has passed through the first lens is incident, a second prism that is joined to the first prism to form a parallel plate-shaped prism light-guiding member, an oblique mirror section that is provided at the joint between the first prism and the second prism and that reflects at least a portion of the image light guided in the first prism, a plano-convex second lens that is arranged opposite the outer surface of the first prism onto which the image light reflected by the oblique mirror section is incident, a transmissive mirror that is formed on the convex surface of the second lens and that partially reflects the image light reflected by the oblique mirror section toward the oblique mirror section, and a quarter-wave plate that is arranged between the outer surface of the first prism and the plane of the second lens. [Explanation of symbols]

[0077] 11...display element, 30...first lens, 30f...light incident surface, 30g...light exit surface, 31...parallel plate, 32...lens portion, 40...first plate-shaped member, 41...first prism, 41a...incident optical surface, 41b...inner surface, 41c...outer surface, 41d...inclined surface, 42...second prism, 42b...inner surface, 42c...outer surface, 42d...inclined surface, 44...lens portion, 45...polarized light separation film, 48...prism light guide member, 50...second plate-shaped member, 50c...inner surface, 51, 151...quarter wave plate, 52...cover member, 53...second lens, 53f...flat surface, 53g...convex surface, 54...compensating lens, 54f...concave surface, 54g...flat surface, 55...compensating plate, 56...transmissive mirror, 58...optical element , 59...polarizing plate, 61...spacer, 71...case, 90...user terminal, 100...optical unit, 100A, 100B...virtual image display device, 100C...support device, 102a, 102b...display drive unit, 103a, 103b...combiner, AS...angle suppression member, AX...optical axis, CR...light-collecting / reflecting unit, CS...light-shielding member, CT...adhesive, DIS...direct virtual image optical system, EP...exit pupil, EY...eye, IM...diagonal mirror unit, IS...imaging optical system, K1...transmission area, K2, K4...light-shielding area, KS...repeated structure, LP...image light-shielding unit, ML...image light, OL...external light, PP...pupil position, RM...louver member, SK...light-shielding body, US...wearer, XS...cross structure

Claims

1. a display element that emits image light; a first lens onto which the image light from the display element is incident; an angle suppression member disposed on the exit side of the first lens; a first prism onto which the image light having passed through the first lens is incident; a second prism bonded to the first prism to form a parallel-plate prism light-guiding member; an inclined mirror portion provided at a joint between the first prism and the second prism, the inclined mirror portion reflecting at least a part of the image light guided through the first prism; a plano-convex second lens disposed opposite an outer surface of the first prism onto which the image light reflected by the oblique mirror portion is incident; a transmissive mirror formed on the convex surface of the second lens and configured to partially reflect the image light reflected by the inclined mirror portion toward the inclined mirror portion; a quarter-wave plate disposed between the outer surface of the first prism and the plane of the second lens; Equipped with Direct virtual image type virtual image display device.

2. The angle suppression member has a light-blocking repeated structure extending in a predetermined direction.

2. The direct virtual image type virtual image display device according to claim 1.

3. The angle suppression member is a louver member in which a plurality of light-blocking blade-shaped members are arranged.

2. The direct virtual image type virtual image display device according to claim 1.

4. the angle suppression member controls the angle of light intersecting with an axis perpendicular to the longitudinal cross section of the prism light guide member; 2. The direct virtual image type virtual image display device according to claim 1.

5. the angle suppression member has a size corresponding to the first lens and is disposed between the first lens and the first prism; 2. The direct virtual image type virtual image display device according to claim 1.

6. the angle suppression member is disposed on the pupil position side of the first prism, 2. The direct virtual image type virtual image display device according to claim 1.

7. the angle suppression member has a transmission region that transmits the image light, and a light-blocking region that is arranged at a predetermined pitch and a predetermined height as the repeating structure; 3. The direct virtual image type virtual image display device according to claim 2.

8. The light-shielding region is a light-shielding body having a rectangular shape in cross section.

8. The direct virtual image type virtual image display device according to claim 7.

9. the light-shielding region is a light-shielding body having a triangular or trapezoidal cross-sectional shape, the angle suppression member has a central light-shielding region whose total area is smaller than the light-shielding regions on both ends in a direction perpendicular to the predetermined direction in which the repeating structure extends; 8. The direct virtual image type virtual image display device according to claim 7.

10. the second prism has a light blocking member on a lower plane thereof; 2. The direct virtual image type virtual image display device according to claim 1.

11. the inclined mirror portion includes a polarization separation film that selectively reflects the image light in accordance with the polarization direction, the first lens, the angle suppression member, the prism light guiding member, the polarization separation film, the second lens, the transmissive mirror, and the quarter-wave plate constitute a simple microscope-type imaging optical system that forms an erect image, The first prism internally reflects the image light twice while diverging the image light.

2. The direct virtual image type virtual image display device according to claim 1.

12. the first lens has a flat light entrance surface bonded to the display element and a convex light exit surface; 2. The direct virtual image type virtual image display device according to claim 1.

13. a first lens onto which image light from a display element that emits image light is incident; an angle suppression member disposed on the exit side of the first lens; a first prism onto which the image light having passed through the first lens is incident; a second prism bonded to the first prism to form a parallel-plate prism light-guiding member; an inclined mirror portion provided at a joint between the first prism and the second prism, the inclined mirror portion reflecting at least a part of the image light guided through the first prism; a plano-convex second lens disposed opposite an outer surface of the first prism onto which the image light reflected by the oblique mirror portion is incident; a transmissive mirror formed on the convex surface of the second lens and configured to partially reflect the image light reflected by the inclined mirror portion toward the inclined mirror portion; a quarter-wave plate disposed between the outer surface of the first prism and the plane of the second lens; Equipped with Direct virtual image type optical unit.

Images