Optical display device

Abstract

To reduce discomfort received by a user when focus of an optical display device is adjusted.SOLUTION: An optical display device comprises: a first lens tube including a first objective optical system receiving light from an external view, and a first eyepiece optical system emitting light entering the first objective optical system; and a second lens tube including a second objective optical system receiving light from the external view, a light receiving element receiving light entering the second objective optical system, a display element emitting video light according to the light received by the light receiving element, and a second eyepiece optical system emitting video light. The first lens tube further includes a focus adjustment part adjusting focus. The second lens tube further includes a distance change part which changes, in accordance with a focus adjustment amount of the first lens tube, a distance on an optical axis from a rear end of the second objective optical system to a light receiving surface of the light receiving element. The second objective optical system is a telecentric optical system.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to optical display devices. [Background technology]

[0002] As binoculars, an optical display device has been proposed that includes a lens barrel in which an analog optical system is arranged to directly view light from an external scene, and a lens barrel in which a digital optical system is arranged to display an image of the external scene received by a light receiving element on a display element to view the image of the external scene. For example, Patent Document 1 discloses an optical observation device (optical display device) that includes a visible light telescope device that forms an image of visible light from the external scene through multiple lenses and prisms, and an infrared light imaging device that extracts a portion of a signal detected by an infrared light sensor provided at a position where infrared light from the external scene is imaged, and displays the extracted image. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-128484 Summary of the Invention [Problem to be solved by the invention]

[0004] In the optical observation device disclosed in Patent Document 1, when the position of the infrared light sensor on the optical axis of the infrared light imaging device is adjusted to match the imaging position of visible light on the optical axis of the visible light telescope device, the height from the optical axis of the light rays incident on the infrared light sensor changes. As a result, a difference occurs between the range of the external scene viewed with the visible light telescope device and the range of the image of the external scene received by the infrared light sensor. In the optical observation device disclosed in Patent Document 1, the difference between the range of the external scene viewed with the visible light telescope device and the range of the external scene captured with the infrared light imaging device may cause a sense of discomfort to the user. [Means for solving the problem]

[0005] The optical display device of this embodiment includes a first lens barrel having a first objective optical system into which light from an external scene is incident and a first eyepiece optical system that outputs the light that is incident on the first objective optical system, and a second lens barrel having a second objective optical system into which light from the external scene is incident, a light receiving element that receives the light that is incident on the second objective optical system, a display element that outputs image light in accordance with the light received by the light receiving element, and the second eyepiece optical system that outputs the image light. The first lens barrel further has a focus adjustment unit that adjusts the focus. The second lens barrel further has a distance change unit that changes the distance on the optical axis from the rear end of the second objective optical system to the light receiving surface of the light receiving element in accordance with the amount of focus adjustment of the first lens barrel. The second objective optical system is a telecentric optical system. Equipped with. [Brief explanation of the drawings]

[0006] [Figure 1] FIG. 1 is a schematic diagram of an optical display device according to a first embodiment. [Figure 2] 2 is a schematic diagram of an objective optical system of a second lens barrel of the optical display device of FIG. 1. FIG. [Figure 3] 3 is a partially enlarged view of FIG. 2, illustrating the optical behavior when the focus is adjusted in the objective optical system of the second lens barrel. FIG. [Figure 4] 10 is a schematic diagram of an optical system in a conventional optical display device that corresponds to the objective optical system of the second lens barrel of the optical device of the first embodiment. FIG. [Figure 5] FIG. 10 is a schematic diagram illustrating a configuration of an optical display device according to a second embodiment. [Figure 6] 6 is a schematic diagram of an aperture stop of the optical display device of FIG. 5. [Figure 7] 6 is a schematic diagram of an aperture stop of the optical display device of FIG. 5. [Figure 8] 6 is a diagram for explaining the behavior of light incident on a light receiving element when the aperture diaphragm of the optical display device of FIG. 5 is fully opened. [Figure 9] 6 is a diagram for explaining the behavior of light incident on a light receiving element when the aperture diaphragm of the optical display device of FIG. 5 is closed more than when it is fully open. DETAILED DESCRIPTION OF THE INVENTION

[0007] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In each drawing, the scale of the dimensions of some components may be changed to make the components easier to see.

[0008] [First embodiment] First, a first embodiment of the present invention will be described with reference to Fig. 1 to Fig. 3. Fig. 1 is a schematic diagram of an optical display device 11 of the first embodiment. As shown in Fig. 1, the optical display device 11 is a pair of binoculars, for example, an IF (Individual Focus) type binoculars. The optical display device 11 includes a first lens barrel 21, a second lens barrel 22, a connecting portion 24, and a computing element 80.

[0009] The first lens barrel 21 includes an analog optical system that allows light incident from the outside world OW to pass through various optical elements such as lenses and prisms and directly enter the user's left eye EYL. The first lens barrel 21 includes a barrel body 25, an objective optical system 31, an eyepiece optical system 41, an inverting optical system 51, and a focus adjustment unit 70. The barrel body 25 is formed in a cylindrical shape and is the housing for the objective optical system 31 and the eyepiece optical system 41.

[0010] In the following description, the direction parallel to the longitudinal direction of first lens barrel 21 and barrel main body 25 is referred to as the Z direction. The outside scene OW side in the Z direction is referred to as the +Z side, and the user's left eye EYL side in the Z direction is referred to as the -Z side. The direction perpendicular to the Z direction is referred to as the X direction, with one side in the X direction referred to as the -X side and the other side in the X direction referred to as the +X side. The direction perpendicular to the X and Z directions is referred to as the Y direction, with one side in the Y direction referred to as the -Y side and the other side in the Y direction referred to as the +Y side. Note that the side facing back perpendicular to the paper surface of FIG. 1 corresponds to the -Y side, and the side facing forward perpendicular to the paper surface of FIG. 1 corresponds to the +Y side.

[0011] The objective optical system 31 corresponds to a first objective optical system described in the claims. The objective optical system 31 has one or more objective lenses 101. The objective lenses 101 are housed in a hollow portion on the +Z side of the tube main body 25. The one or more objective lenses 101 are arranged at intervals from one another along the optical axis AX1 of light L1 that enters the first lens barrel 21 from the outside scene OW and passes sequentially through the objective optical system 31, the inverting optical system 51, and the eyepiece optical system 41. The objective lenses 101 are supported from the outside in the radial direction about the optical axis AX1 by the tube main body 25 or by a support member (not shown) interposed between the tube main body 25 and the objective lenses 101.

[0012] 1 illustrates a single biconvex lens as the objective lens 101. The objective lens 101 may be any type of lens other than a biconvex lens, such as a single plano-convex lens, a biconcave lens, a plano-concave lens, a meniscus lens, or an aspherical lens. The objective lens 101 may also be a cemented lens in which two or more lenses of various types are cemented together on an optical axis AX1.

[0013] 1 illustrates three objective lenses 101A, 101B, and 101C as one or more objective lenses 101 of the objective optical system 31. The number and type of the objective lenses 101 in the objective optical system 31 are appropriately set in accordance with the optical characteristics, such as the amount of aberration, allowed for the objective optical system 31.

[0014] The eyepiece optical system 41 corresponds to a first eyepiece optical system described in the claims below. The eyepiece optical system 41 has one or more eyepiece lenses 111. The eyepiece optical system 41 is housed in a hollow portion on the +Z side of the tube main body 25. The one or more eyepiece lenses 111 are arranged on the -Z side of the objective lens 101C, which is arranged furthest on the -Z side among the objective lenses 101 constituting the objective optical system 31, on the optical axis AX1, and are arranged at intervals from each other along the optical axis AX1. The eyepiece lenses 111 are supported from the outside in the radial direction centered on the optical axis AX1 by the tube main body 25 or a support member (not shown) interposed between the tube main body 25 and the eyepiece lenses 111.

[0015] 1 illustrates a single biconvex lens as the eyepiece 111. The eyepiece 111 may be any type of lens other than a biconvex lens, such as a single plano-convex lens, a biconcave lens, a plano-concave lens, a meniscus lens, or an aspherical lens. The eyepiece 111 may also be a cemented lens in which two or more lenses of various types are cemented together on the optical axis AX1.

[0016] 1 illustrates two eyepieces 111A and 111B as one or more eyepieces 111 of the eyepiece optical system 41. The number and type of eyepieces 111 in the eyepiece optical system 41 are appropriately set according to the optical characteristics of the eyepiece optical system 41, such as the amount of aberration allowed.

[0017] The inverting optical system 51 erects an image of the outside scene OW formed by light L1 that passes from the outside scene OW through the objective optical system 31 and the eyepiece optical system 41 and reaches the user's left eye EYL directly. The inverting optical system 51 includes, for example, a roof prism 121 and an auxiliary prism 122. In other words, the optical display device 11 is a roof-type binocular. The roof prism 121 and the auxiliary prism 122 are housed in a hollow portion of the main body 24A of the connecting part 24, which corresponds to a hollow portion approximately in the longitudinal center of the tube main body 25, and are supported from the outside in the radial direction centered on the optical axis AX1 by the main body 24A or a support member (not shown) interposed between the main body 24A and the roof prism 121 and the auxiliary prism 122.

[0018] On the optical axis AX1, the roof prism 121 is positioned on the -Z side of the objective lens 101C of the objective optical system 31, and on the +Z side of the eyepiece lens 111B which is positioned furthest on the +Z side in the eyepiece optical system 41.

[0019] The roof prism 121, also known as a roof prism or a Schmidt prism, has an incident surface 121a, an exit surface 121b, and roof surfaces 121c and 121d. The incident surface 121a is perpendicular to the optical axis AX1. The -X side end of the exit surface 121b is connected to the -X side end of the incident surface 121a. The exit surface 121b intersects the optical axis AX1, is parallel to the Y direction, and moves from the +Z side to the -Z side as it progresses from the -X side to the +X side. The roof surfaces 121c and 121d form a connecting surface that connects the +X side end of the incident surface 121a and the +X side end of the exit surface 121b. The roof surface 121c is the surface of the connecting surface that is closer to the +Y side than the ridge line 121p. The roof surface 121d is the surface of the connecting surface that is closer to the -Y side than the ridge line 121p.

[0020] Auxiliary prism 122, also known as a Pechan prism, has incident surface 122a, reflecting surface 122r, and exit surface 122b. Incident surface 122a intersects optical axis AX1 and is arranged parallel to exit surface 121b of roof prism 121. The -X side end of reflecting surface 122r is connected to the -X side end of incident surface 122a via another side surface. Reflecting surface 122r intersects optical axis AX1, is parallel to the Y direction, and moves more from the +Z side to the -Z side as it progresses from the -X side to the +X side than incident surface 122a. Exit surface 122b connects the +X side end of incident surface 122a and the +X side end of exit surface 122b and is perpendicular to optical axis AX1.

[0021] In the first lens barrel 21 having the above-described configuration, light L1 traveling from the external view OW along the Z direction toward the -Z side enters the objective optical system 31, passes sequentially through the objective lenses 101A, 101B, and 101C of the objective optical system 31, propagates along the optical axis AX1, and enters the inversion optical system 51.

[0022] Light L1 incident along the Z direction from incident surface 121a of roof prism 121 of inverting optical system 51 propagates inside roof prism 121, is totally reflected successively by exit surface 121b, roof surfaces 121c and 121d, and entrance surface 121a, travels along optical axis AX1, strikes exit surface 121b approximately perpendicularly, and is emitted from exit surface 121b. Light L1 emerging from exit surface 121b of roof prism 121 propagates through entrance surface 122a inside auxiliary prism 122, is totally reflected successively by reflecting surface 122r and entrance surface 122a, travels along optical axis AX1, strikes exit surface 122b approximately perpendicularly, and is emitted from exit surface 122b along the Z direction.

[0023] Light L1 emitted from the exit surface 122b of the auxiliary prism 122 of the inverting optical system 51 toward the -Z side enters the eyepiece optical system 41, passes through the eyepiece lenses 111A and 111B of the eyepiece optical system 41 sequentially, propagates along the optical axis AX1, enters the user's left eye EYL, and forms an image on the retina of the left eye EYL.

[0024] Tube main body 25 has tube main body 25A on the +Z side and tube main body 25B on the -Z side. Tube main body 25A is connected from the +Z side to main body 24A on the -X side of center portion 24C of connecting portion 24 in the X direction, and is fixed to connecting portion 24. Tube main body 25A houses objective optical system 31.

[0025] The tube main body 25B is connected to the main body 24A of the connecting part 24 from the -Z side. The axis of the tube main body 25B is shifted toward the +X side from the axis of the tube main body 25A by an amount equivalent to the deviation in the X direction between the optical axis AX1, which is parallel to the Z direction, of the light L1 incident on the roof prism 121 of the inverting optical system 51, and the optical axis AX1, which is parallel to the Z direction, of the light L1 emerging from the auxiliary prism 122. The tube main body 25B is connected to the main body 24A of the connecting part 24 in a state where it can rotate around its own axis and the optical axis AX1. The amount by which the tube main body 25B protrudes toward the -Z side from the main body 24A of the connecting part 24 is variable in proportion to the amount of rotation of the tube main body 25B.

[0026] For example, a male thread is threaded onto the outer peripheral surface of the end on the +Z side of tube main body 25B. A female thread, into which the male thread of tube main body 25B can be threaded, is threaded onto the inner peripheral surface of the portion of main body 24A of connecting portion 24 to which tube main body 25B is connected. Note that a fall-off prevention mechanism (not shown) for preventing tube main body 25B from falling off from main body 24A is provided on at least one of the +Z side end of tube main body 25B and the -Z side end of the portion of main body 24A to which tube main body 25B is connected.

[0027] The tube main body 25B accommodates the eyepiece optical system 41. The distance between the objective optical system 31 and the eyepiece optical system 41 on the optical axis AX1 changes in proportion to the amount of protrusion of the tube main body 25B from the main body 24A of the connecting portion 24 toward the -Z side. Specifically, as the amount of protrusion of the tube main body 25B from the main body 24A of the connecting portion 24 toward the -Z side increases, the distance between the center plane of the objective lens 101C of the objective optical system 31 and the center plane of the eyepiece lens 111B of the eyepiece optical system 41 on the optical axis AX1 also increases. Conversely, as the amount of protrusion of the tube main body 25B from the main body 24A toward the -Z side decreases, the distance between the center plane of the objective lens 101C and the center plane of the eyepiece lens 111B on the optical axis AX1 also decreases.

[0028] As described above, the distance between objective optical system 31 and eyepiece optical system 41 on optical axis AX1 changes in proportion to the amount of projection of tube body 25B from main body 24A of connecting portion 24 toward the -Z side, thereby changing the focal length of the entire analog optical system of first lens barrel 21 and adjusting the focus of the analog optical system of first lens barrel 21. In other words, tube body 25B exhibits a focus adjustment function in first lens barrel 21 and corresponds to focus adjustment unit 70. The user can adjust the amount of projection of tube body 25B from main body 24A toward the -Z side by changing the amount of rotation of tube body 25B, thereby adjusting the focus of the analog optical system of first lens barrel 21 and bringing the object of observation in the outside view OW into focus.

[0029] The second lens barrel 22 is equipped with a digital optical system that displays an image of the outside scene OW received by the light receiving element 55 on a display element 60, allowing the image of the outside scene OW to be visually recognized. The second lens barrel 22 has a barrel body 26, an aperture stop 62, an objective optical system 32, the light receiving element 55, a moving device 58, the display element 60, and an eyepiece optical system 42.

[0030] Tube body 26 is formed in a cylindrical shape and has the same shape as tube body 25, and is a housing for objective optical system 32, eyepiece optical system 42, and light receiving element 55. The longitudinal direction of second lens barrel 22 and tube body 26 is parallel to the longitudinal direction of first lens barrel 21 and tube body 25, specifically parallel to the Z direction. Tube body 26 is positioned on the +X side of tube body 25 of first lens barrel 21, and overlaps with tube body 25 in the Y direction.

[0031] Aperture diaphragm 62 is disposed at the +Z side end of tube body 26, and is installed at the +Z side end of tube body 26 in a state where it can be attached and detached from the +Z side, i.e., the outside scene OW side. An aperture PA is formed in aperture diaphragm 62 with a predetermined diameter centered on optical axis AX2 of light L2 entering second lens barrel 22 from the outside scene OW. The predetermined diameter of aperture PA is set appropriately in consideration of the amount of light L2 required for second lens barrel 22 and objective optical system 32, or the amount of light L2 that is allowed, depending on the light receiving sensitivity of light receiving element 55, and is invariable. Aperture diaphragm 62 is a so-called fixed diaphragm.

[0032] The objective optical system 32 corresponds to the second objective optical system described in the claims. The objective optical system 32 has one or more objective lenses 102. The objective lenses 102 are housed in a hollow portion on the +Z side of the tube main body 26. The one or more objective lenses 102 are arranged at intervals from one another along the optical axis AX2 of light L2 that enters the second lens-barrel 22 from the outside scene OW and passes through the objective optical system 32. The objective lenses 102 are supported from the outside in the radial direction centered on the optical axis AX2 by a moving device 58 interposed between the objective lenses 102 and the tube main body 26.

[0033] 1 illustrates a single aspherical lens as the objective lens 102. The objective lens 102 may be any type of lens other than an aspherical lens, such as a single biconvex lens, a plano-convex lens, a biconcave lens, a plano-concave lens, or a meniscus lens. The objective lens 102 may also be a cemented lens in which two or more lenses of various types are cemented together on the optical axis AX2.

[0034] 1 illustrates two objective lenses 102A and 102B as one or more objective lenses 102 of the objective optical system 32. The objective lens 102A corresponds to a first objective lens described in the claims to be described later. The objective lens 102B corresponds to a second objective lens described in the claims to be described later. The number and type of objective lenses 102 in the objective optical system 32 are set appropriately according to the optical characteristics, such as the amount of aberration, allowed for the objective optical system 32.

[0035] The light receiving element 55 is housed in a hollow portion on the +Z side of the tube main body 25, on the -Z side of the objective optical system 32 on the optical axis AX2. The light receiving element 55 is arranged on the optical axis AX2 further to the -Z side than the objective lens 102B, which is arranged furthest to the -Z side among the objective lenses 102 constituting the objective optical system 32. The light receiving element 55 is supported from the outside in the radial direction centered on the optical axis AX2 by the tube main body 26 or a support member (not shown) interposed between the tube main body 26 and the light receiving element 55.

[0036] The light receiving element 55 has a light receiving surface 55a that receives light L2 incident from the +Z side along the optical axis AX2. The light receiving surface 55a is a surface of the light receiving element 55 facing the +Z side and is arranged parallel to a plane that includes the X direction and the Y direction.

[0037] The light receiving element 55 includes, for example, an element substrate 57 and a cover member 56. The element substrate 57 and the cover member 56 are plate-like members and have plate surfaces that are parallel to a plane including the X and Y directions and perpendicular to the optical axis AX2. A plurality of micro light receiving elements (not shown) that receive light L2 in the light receiving element 55 are arranged on a light receiving surface 55a that includes the center of the plate surface on the +Z side of the element substrate 57. The cover member 56 covers the light receiving surface 55a from the +Z side to protect the plurality of micro light receiving elements. The cover member 56 is formed of a material that transmits light L2, such as a glass substrate.

[0038] The light receiving element 55 is not limited as long as it can receive light L2 from the outside scene OW as image light, but may be, for example, a CMOS (Complementary Metal Oxide Semiconductor) image sensor or a CCD (Charge Coupled Device) image sensor.

[0039] In the second lens barrel 22, light L2 traveling from the external view OW toward the -Z side along the Z direction enters the objective optical system 32, passes sequentially through the objective lenses 102A and 102B of the objective optical system 32, propagates along the optical axis AX2, and is imaged on the light receiving surface 55a of the light receiving element 55.

[0040] In the objective optical system 32, at least one of the one or more objective lenses 102 is arranged in a hollow portion of the tube body 26 in a state in which it is movable on the optical axis AX2. In the first embodiment, the relative positional relationship between the objective lenses 102A and 102B on the optical axis AX2 is fixed, and the objective lenses 102A and 102B are installed in a state in which they are movable on the optical axis AX2 to the -Z side or the +Z side.

[0041] The moving device 58 holds the objective lenses 102A, 102B and moves them to the -Z side or the +Z side along the optical axis AX2. The distance between the objective lenses 102A, 102B and the display element 60 on the optical axis AX2 varies depending on the amount of movement of the moving device 58 along the optical axis AX2. The moving device 58 corresponds to a distance changing unit described in the claims below.

[0042] The moving device 58 holds the objective lenses 102A, 102B in a state where the relative positions and separation distances of the one or more objective lenses 102A, 102B in the Z direction and on the optical axis AX2 are maintained. The moving device 58 grips the outer peripheral ends of the objective lenses 102A, 102B that are outer than the portion through which the light L2 passes, for example, grips the outer peripheral ends on the -X and +X sides of the objective lenses 102A, 102B. The moving device 58 is fitted into rails (not shown) that are provided along the Z direction and the optical axis AX2 on the inner peripheral surface of the tube main body 26A on the +Z side of the tube main body 26, and is movable along the rails.

[0043] By changing the distance between the objective lenses 102A and 102B and the light receiving surface 55a of the light receiving element 55, the focal length of the entire objective optical system 32 of the second lens barrel 22 changes, the focus of the objective optical system 32 is adjusted, and the object to be observed in the external view OW can be brought into focus.

[0044] The display element 60 is disposed on the -Z side of the light receiving element 55. At least a portion of the display element 60 overlaps with the light receiving element 55 in the X and Y directions. The display element 60 is housed in a hollow portion of the main body 24B that is disposed on the +X side of the center 24C of the connecting part 24, which corresponds to the hollow portion at approximately the center of the longitudinal direction of the tube main body 26, and is supported from the outside in the radial direction centered on the optical axis AX3 by the main body 24B or a support member (not shown) interposed between the main body 24B and the display element 60.

[0045] The display element 60 has a display surface 60e that emits light L3 toward the -Z side along an optical axis AX3. Light L3 corresponds to the image light described in the claims below. The display surface 60e is a surface of the display element 60 that faces the -Z side and is disposed parallel to a plane that includes the X and Y directions. The center of the display surface 60e of the display element 60 in the X direction and the optical axis AX3 are slightly offset toward the -X side from the center of the light receiving surface 55a of the light receiving element 55 in the X direction and the optical axis AX2.

[0046] The amount of deviation in the X direction of optical axes AX2 and AX3 is equivalent to the deviation in the X direction between optical axis AX1, which is parallel to the Z direction, of light L1 entering roof prism 121 of inverting optical system 51 of first barrel 21, and optical axis AX1, which is parallel to the Z direction, of light L1 emerging from auxiliary prism 122. As a result, barrel body 26 of second barrel 22 is configured symmetrically with barrel body 25 of first barrel 21, with respect to central axis JX, which is parallel to the Z direction, of center portion 24C of connecting portion 24.

[0047] The display element 60 is electrically connected by wire or wirelessly to the light receiving element 55. The display element 60 receives, from the light receiving element 55, video information of the outside scene OW generated by the light L2 that forms an image on the light receiving surface 55a, as an electrical signal SG.

[0048] The type of display element 60 is not specified as long as it can display a two-dimensional image on a plane including the X and Y directions, but may be, for example, a liquid crystal panel, an organic EL (electro-luminescence) display such as an OLED (Organic Light Emitting Diode), a micro LED (Light Emitting Diode), or a MEMS (Micro Electro Mechanical Systems) type light source.

[0049] The optical system in the second barrel 22, including the aperture stop 62, the objective optical system 32, and the light receiving element 55, is a telecentric optical system, as will be described later.

[0050] The eyepiece optical system 42 corresponds to a second eyepiece optical system described in the claims below. The eyepiece optical system 42 has one or more eyepiece lenses 112. The eyepiece optical system 42 is housed in a hollow portion on the +Z side of the tube body 26. The one or more eyepiece lenses 112 are arranged on the -Z side of the objective lens 101C, which is arranged furthest on the -Z side among the objective lenses 101 constituting the objective optical system 31, on the optical axis AX2, and are arranged at intervals from each other along the optical axis AX1. The eyepiece lenses 111 are supported from the outside in the radial direction centered on the optical axis AX1 by the tube body 25 or a support member (not shown) interposed between the tube body 25 and the eyepiece lenses 112.

[0051] 1 illustrates a single biconvex lens as the eyepiece 112. The eyepiece 112 may be any type of lens other than a biconvex lens, such as a single plano-convex lens, a biconcave lens, a plano-concave lens, a meniscus lens, or an aspherical lens. The eyepiece 112 may also be a cemented lens in which two or more lenses of various types are cemented together on the optical axis AX3.

[0052] 1 illustrates two eyepieces 112A and 112B as one or more eyepieces 112 of the eyepiece optical system 42. The number and type of eyepieces 112 in the eyepiece optical system 42 are appropriately set according to the optical characteristics of the eyepiece optical system 42, such as the amount of aberration allowed.

[0053] Tube main body 26 has tube main body 26A on the +Z side and tube main body 26B on the -Z side. Tube main body 26A is connected from the +Z side to main body 24B, which is on the +X side of center 24C of connecting part 24 in the X direction, and is fixed to connecting part 24. Tube main body 26A houses objective optical system 32 and light receiving element 55.

[0054] Tube main body 26B is connected to main body 24B of connecting portion 24 from the -Z side. The axis of tube main body 26B is shifted toward the -X side with respect to the axis of tube main body 26A by a distance equivalent to the deviation in the X direction between optical axis AX1, which is parallel to the Z direction, of light L1 entering roof prism 121 of inverting optical system 51, and optical axis AX1, which is parallel to the Z direction, of light L1 emerging from auxiliary prism 122. In this way, tube main body 26 is configured symmetrically with tube main body 25 of first lens barrel 21 with respect to central axis JX, making it easier for the user to handle optical display device 11 and reducing discomfort and fatigue during observation.

[0055] The tube main body 26B is connected to the main body 24B of the connecting part 24 in a state where it can rotate about its own axis and the optical axis AX3. The amount of projection of the tube main body 26B from the main body 24B of the connecting part 24 to the -Z side is variable in proportion to the amount of rotation of the tube main body 26B.

[0056] For example, a male thread is threaded onto the outer peripheral surface of the end on the +Z side of tube main body 26B. A female thread, into which the male thread of tube main body 26B can be threaded, is threaded onto the inner peripheral surface of the portion of main body 24B of connecting portion 24 to which tube main body 26B is connected. Note that a fall-off prevention mechanism (not shown) for preventing tube main body 26B from falling off from main body 24B is provided on at least one of the +Z side end of tube main body 26B and the -Z side end of the portion of main body 24B to which tube main body 26B is connected.

[0057] The tube main body 26B accommodates the eyepiece optical system 42. The distance on the optical axis AX3 between the display element 60 and the eyepiece optical system 42 changes in proportion to the amount of protrusion of the tube main body 26B from the main body 24B of the connecting portion 24 toward the -Z side. Specifically, as the amount of protrusion of the tube main body 26B from the main body 24B of the connecting portion 24 toward the -Z side increases, the distance on the optical axis AX3 between the display surface 60e of the display element 60 and the principal surface of the eyepiece lens 112B, which is disposed furthest on the +Z side in the eyepiece optical system 42, also increases. Conversely, as the amount of protrusion of the tube main body 26B from the main body 24B toward the -Z side decreases, the distance on the optical axis AX3 between the display surface 60e of the display element 60 and the principal surface of the eyepiece lens 112B also decreases.

[0058] In first barrel 21, when there is zero deviation in the X direction between optical axis AX1 parallel to the Z direction of light L1 entering roof prism 121 of inverting optical system 51 and optical axis AX1 parallel to the Z direction of light L1 emerging from auxiliary prism 122, the axes of tube bodies 25A and 25B overlap in the X direction, and tube bodies 25A and 25B are arranged on a straight line parallel to the Z direction. In this case, tube bodies 26A and 26B of second barrel 22 are arranged on a straight line parallel to the Z direction.

[0059] Connecting portion 24 has main bodies 24A and 24B and center portion 24C. As described above, main body 24A connects tube main bodies 25A and 25B of first barrel 21 to each other in the Z direction. A roof prism 121 and an auxiliary prism 122 of inverting optical system 51 are accommodated in the hollow portion of main body 24A through which tube main body 25A is inserted. As described above, main body 24B connects tube main bodies 26A and 26B of second barrel 22 to each other in the Z direction. A display element 60 is accommodated in the hollow portion of main body 24B through which tube main body 26A is inserted.

[0060] The center portion 24C is an axial member having a longitudinal direction parallel to the Z direction, and connects the main bodies 24A and 24B to each other in the X direction. A central axis JX, which is the axis of the center portion 24C, is parallel to the Z direction. The main bodies 24A and 24B are connected to the center portion 24C in a state in which they can rotate in the circumferential direction around the central axis JX. However, even if the main bodies 24A and 24B rotate in the circumferential direction around the central axis JX, the image of the outside scene OW viewed by the user's left eye EYL through the first lens barrel 21 does not rotate around the optical axis AX1, and the image from the display element 60 viewed by the user's right eye EYR through the second lens barrel 22 does not rotate around the optical axis AX3.

[0061] The computing element 80 is disposed at any position in the hollow portion of the connecting portion 24, for example, on the −X side of the main body 24A of the connecting portion 24, that is, in the hollow portion on the center portion 24C side. The calculation element 80 detects the amount of protrusion of the tube main body 25B from the main body 24A of the connecting portion 24 toward the -Z side, and calculates the appropriate adjustment amount of the focus of the analog optical system of the first lens barrel 21 corresponding to the amount of protrusion of the tube main body 25B, taking into account the shapes of the entrance and exit surfaces of each of the objective lenses 101A, 101B, and 101C, the distance between the objective lenses 101A and 101B, the distance between the objective lenses 101B and 101C, the shapes of the entrance and exit surfaces of each of the eyepiece lenses 111A and 111B, the distance between the eyepiece lenses 111A and 111B, the shapes of the entrance and exit surfaces of each of the objective lenses 102A and 102B, and the distance between the objective lenses 102A and 102B, etc.

[0062] The calculation element 80 calculates the amount of focus adjustment of the objective optical system 32 of the second lens barrel 22 in accordance with the amount of focus adjustment of the analog optical system, and further calculates the relative positions of the objective lenses 102A, 102B with respect to the light receiving element 55 on the optical axis AX2 in accordance with the amount of focus adjustment of the objective optical system 32.

[0063] The calculation element 80 is electrically connected to the movement device 58 by wire or wirelessly. The calculation element 80 transmits to the movement device 58 an electrical signal SN indicating the relative position of the objective lenses 102A and 102B calculated in accordance with the focus adjustment amount of the analog optical system of the first lens barrel 21. The movement device 58 receives the electrical signal SN from the calculation element 80 and appropriately moves the objective optical system 32 along the Z direction in accordance with the position information contained in the electrical signal SN to adjust the relative positions of the objective lenses 102A and 102B with respect to the light receiving element 55. At this time, the distance DS in the Z direction and along the optical axis AX3 between the intersection of the exit surface of the objective lens 102B, which is located at the -Z side of the objective optical system 32, i.e., the rear of the objective lens 102A on the optical axis AX2, and the light receiving surface 55a of the light receiving element 55, is adjusted. The intersection of the exit surface of the objective lens 102B and the optical axis AX2 corresponds to the rear end 32k of the objective optical system 32.

[0064] For example, as described above, calculation element 80 detects the amount of protrusion of tube main body 25B from main body 24A of connecting portion 24 toward the -Z side, and calculates the appropriate amount of focus adjustment for the analog optical system of first lens barrel 21 and distance DS from design parameters including the shapes of the entrance and exit surfaces of each of objective lenses 101A, 101B, and 101C. Calculation element 80 has a processor that calculates distance DS as described above, and is, for example, an integrated circuit, a microcomputer, or the like.

[0065] In second barrel 22 having the above-described configuration, light L2 traveling from the outside scene OW toward the −Z side along the Z direction enters objective optical system 32, passes sequentially through objective lenses 102A and 102B of objective optical system 32, propagates along optical axis AX2, and forms an image on light-receiving surface 55a of light-receiving element 55. In first barrel 21, when a user rotates tube body 25B about optical axis AX1 to adjust the focus of the analog optical system and focus on an observation target in the outside scene OW, movement device 58 of second barrel 22 receives electrical signal SN from computing element 80 and moves objective lenses 102A and 102B of objective optical system 32 to relative positions calculated corresponding to the focus adjustment amount of the analog optical system. As a result, an image of the outside scene OW focused corresponding to the focus adjustment amount of the analog optical system of first barrel 21 is formed on light-receiving surface 55a of light-receiving element 55.

[0066] The display element 60 receives the electrical signal SG from the light receiving element 55, and displays an image of the outside scene OW based on the electrical signal SG, as well as auxiliary images such as a scale and guide information corresponding to the image of the outside scene OW, on the -Z side of the display surface 60e.

[0067] The light L3 emitted from the display surface 60e of the display element 60 and the image or video displayed on the display surface 60e reflect the focus adjustment amount of the analog optical system of the first lens barrel 21 and the focus adjustment amount of the objective optical system 32 of the second lens barrel 22. For example, the image or video displayed on the display surface 60e of the display element 60 is subjected to image corrections such as contrast correction, brightness correction, and color correction, the amounts of which correlate with the focus adjustment amount of the second lens barrel 22, which includes information on the focus adjustment amount of the first lens barrel 21. Light L3 traveling from the display surface 60e of the display element 60 toward the -Z side along the Z direction enters the eyepiece optical system 42, passes sequentially through eyepiece lenses 112A and 112B of the eyepiece optical system 42, propagates along the optical axis AX3, and forms an image on the retina of the user's right eye EYR.

[0068] As described above, the distance between the display element 60 and the eyepiece optical system 42 on the optical axis AX3 changes in proportion to the amount of protrusion of the tube main body 26B from the main body 24B of the connecting portion 24 toward the -Z side, thereby changing the focal length of the entire eyepiece optical system 42 of the second lens barrel 22 and adjusting the focus of the eyepiece optical system 42. In other words, the tube main body 26B exhibits a focus adjustment function for the eyepiece optical system 42. The user can adjust the amount of protrusion of the tube main body 26B from the main body 24B toward the -Z side by changing the amount of rotation of the tube main body 26B, thereby adjusting the focus of the optical system including the display element 60 and the eyepiece optical system 42, and thereby adjusting the focus of the display surface 60e of the display element 60, the image displayed on the display surface 60e, and the user's right eye EYR.

[0069] 2 is a schematic diagram of an optical system including aperture stop 62, objective optical system 32, and light receiving element 55 in second lens barrel 22. As shown in Fig. 2, objective optical system 32 is a telecentric optical system. Light L2 enters the optical system including aperture stop 62, objective optical system 32, and light receiving element 55 as approximately parallel light from a distance on the +Z side.

[0070] 2 illustrates three light rays LB1, LB2, and LB3 contained in light L2 incident from the outside scene OW. The total length of the optical system including aperture stop 62 of second lens barrel 22, objective optical system 32, and light receiving element 55 corresponds to the distance from the position of aperture PA of aperture stop 62 in the Z direction and on optical axis AX2 to light receiving surface 55a of light receiving element 55, which is distance DZ. As an example, when distance DZ is 40 mm, the diameter of aperture PA, i.e., the dimension in the X direction, is 5 mm.

[0071] Light ray LB1 is incident from the +Z side on aperture PA of aperture stop 62, which is disposed closest to the +Z side in the digital optical system including objective optical system 32 and eyepiece optical system 42 of second lens barrel 22, parallel to the Z direction and optical axis AX2, i.e., at a zero angle with respect to optical axis AX2. Light ray LB1 passes through aperture PA and is incident on objective lens 102A, which is an aspherical lens of objective optical system 32. Light ray LB1 passes through objective lens 102A, is focused in the X direction, propagates toward the -Z side along the Z direction and optical axis AX2, and is incident on the center in the X direction of objective lens 102B, which is also an aspherical lens of objective optical system 32. Light ray LB1 passes through the center of objective lens 102B, is further focused in the X direction, propagates toward the -Z side parallel to the Z direction and optical axis AX2, and is imaged at the center of light-receiving surface 55a of light-receiving element 55. The center of the light receiving surface 55a includes the intersection point between the light receiving surface 55a and the optical axis AX2.

[0072] Light ray LB2 is incident on aperture PA of aperture stop 62 from the +Z side at an angle slightly greater than zero with respect to the Z direction and the optical axis AX2. Light ray LB2 passes through aperture PA, enters objective lens 102A, and propagates toward the -Z side while passing through objective lens 102A and being focused in the Y direction. As it travels toward the -Z side, it moves toward the -Y side and moves away from optical axis AX2, and is incident on the -Y side end of objective lens 102B. Light ray LB2 passes through the -Y side end of objective lens 102B, and while being further focused in the Y direction, it propagates toward the -Z side in the Z direction and parallel to the optical axis AX2, and is imaged on the -Y side end of light-receiving surface 55a of light-receiving element 55.

[0073] Light ray LB3 is incident on aperture PA of aperture stop 62 from the +Z side at an angle slightly larger than zero with respect to the Z direction and optical axis AX2 and at an angle opposite to light ray LB2. Light ray LB3 passes through aperture PA, enters objective lens 102A, passes through objective lens 102A, and propagates toward the -Z side while being focused in the Y direction. As it travels toward the -Z side, it moves toward the +Y side, moving away from optical axis AX2, and is incident on the +Y side end of objective lens 102B. Light ray LB3 passes through the +Y side end of objective lens 102B, and while further focused in the Y direction, propagates toward the -Z side parallel to the Z direction and optical axis AX2, and is imaged on the +Y side end of light-receiving surface 55a of light-receiving element 55.

[0074] 3 is a partially enlarged view of FIG. 2 and is a diagram illustrating the behavior of light rays LB1, LB2, and LB3 on light-receiving surface 55a of light-receiving element 55 when the focus is adjusted in objective optical system 32 of optical display device 11. As shown in the upper part of FIG. 3, light-receiving surface 55a of light-receiving element 55 is disposed at position P1 in the Z direction, and light rays LB1, LB2, and LB3 emitted from objective lens 102B (not shown in FIG. 3) travel parallel to the Z direction toward the -Z side and form an image at position P1. At this time, the size in the X direction of the image of the outside scene OW formed by light L2 on light-receiving surface 55a corresponds to the distance between the image-forming position of light ray LB2 and the image-forming position of light ray LB3, and is, for example, α.

[0075] When the user adjusts the focus of the analog optical system by changing the amount of rotation of barrel body 26B of first lens barrel 21, electrical signal SN is received from computing element 80, and the focus of objective optical system 32 is adjusted, so that, for example, position P2 in the Z direction of light-receiving surface 55a of light-receiving element 55 moves relatively to the -Z side from position P1, as shown in the middle of Figure 3. Even in this case, because objective optical system 32 is a telecentric optical system, the size in the X direction of the image of the outside scene OW formed by light L2 on light-receiving surface 55a is α.

[0076] For example, it is conceivable that the focus of the objective optical system 32 is adjusted, and position P3 in the Z direction of the light-receiving surface 55a of the light-receiving element 55 moves relatively to the +Z side from position P1, as shown in the lower part of Fig. 3. Even in this case, since the objective optical system 32 is a telecentric optical system, the size in the X direction of the image of the outside scene OW formed by light L2 on the light-receiving surface 55a is α.

[0077] The optical display device 11 of the first embodiment described above includes a first lens barrel 21 and a second lens barrel 22. The first lens barrel 21 includes an objective optical system (first objective optical system) 31 into which light L1 from the outside scene OW is incident from the +Z side, and an eyepiece optical system (first eyepiece optical system) 41 that emits light L1 that is emitted from the objective optical system 31 and incident from the +Z side. Light L1 that enters the objective optical system 31 passes through the objective optical system 31, exits from the objective optical system 31, and enters the eyepiece optical system 41. The second lens barrel 22 has an objective optical system (second objective optical system) 32 into which light L2 from the outside scene OW is incident from the +Z side, a light receiving element 55 that receives the light L2 that enters the objective optical system 32 and is emitted from the objective optical system 32 to the -Z side, a display element 60 that emits light (image light) L3 in accordance with the light L2 received by the light receiving element 55, and an eyepiece optical system (second eyepiece optical system) 42 that emits the light L3. The eyepiece optical system 42 propagates the light L3 emitted from the display element 60 along the Z direction and the optical axis AX3, and emits it to the -Z side.

[0078] In the optical display device 11 of the first embodiment, the first lens barrel 21 further includes a focus adjustment unit 70 that adjusts the focus of an analog optical system including the objective optical system 31 and the eyepiece optical system 41. The focus adjustment unit 70 adjusts the focus of the analog optical system by moving the eyepiece optical system 41 on the optical axis AX1 and changing the distance of the eyepiece optical system 41 from the objective optical system 31 on the optical axis AX1. The second lens barrel 22 further includes a movement device (distance change unit) 58 that changes the distance DS from the rear end 32k of the objective optical system 32 to the light-receiving surface 55a of the light-receiving element 55 on the optical axis AX2 in accordance with the amount of movement of the eyepiece optical system 41 on the optical axis AX1, i.e., the amount of focus adjustment of the analog optical system of the first lens barrel 21. In the optical display device 11 of the first embodiment, the objective optical system 32 is a telecentric optical system.

[0079] The optical display device 11 of the first embodiment includes a first lens barrel 21 that houses an analog optical system that allows a user to directly view light from the outside scene OW, and a second lens barrel 22 that houses a digital optical system that displays an image of the outside scene OW received by a light receiving element 55 on a display element 60, allowing the user to view an image of the outside scene OW. In the optical display device 11 of the first embodiment, the objective optical system 32 from the aperture stop 62 of the second lens barrel 22 to the light receiving element 55 is a telecentric optical system. As a result, as explained with reference to FIG. 3, even when the user adjusts the focus of the analog optical system of first lens barrel 21 and distance DS of objective optical system 32 of second lens barrel 22 is appropriately adjusted in conjunction with the amount of focus adjustment in the analog optical system, the height of the ray of light L2 incident on light-receiving surface 55a of light-receiving element 55, i.e., the separation distance in the X direction between light rays LB2 and LB3 that enter light-receiving element 55 and form an image on light-receiving surface 55a, and the size in the X direction of the image of the outside scene OW formed by light L2 are T, and do not change depending on the amount of focus adjustment in the analog optical system.

[0080] As a result, the difference is reduced between the range of the outside scene OW viewed by the user's left eye EYL by the analog optical system of the first lens barrel 21 and the range of the outside scene OW received by the light receiving element 55 of the second lens barrel 22. The optical display device 11 of the first embodiment can reduce the discomfort felt by the user due to the difference between the range of the outside scene OW viewed by the left eye EYL by light L1 from the first lens barrel 21 and the range of the outside scene OW viewed by the right eye EYR by light L3 from the second lens barrel 22.

[0081] FIG. 4 is a schematic diagram of the objective optical system of the digital optical system of a conventional optical display device. As shown in FIG. 4, the objective optical system of the digital optical system in the conventional optical display device has, for example, two objective lenses 122A and 122B as objective lens 122. The entrance and exit surfaces of objective lens 122A are curved and aspherical, but have shapes different from the entrance and exit surfaces of objective lens 102A. The entrance and exit surfaces of objective lens 122B are curved and aspherical, but have shapes different from the entrance and exit surfaces of objective lens 102B. The objective optical system of the conventional optical display device is not a telecentric optical system.

[0082] 4 enters the objective optical system from the +Z side, passes through objective lens 122A, and is converged in the Y direction. Light ray LB1 emerging from objective lens 122A passes through aperture PA of aperture stop 62, which is positioned on the -Z side of objective lens 122A, and propagates toward the -Z side along the Z direction and optical axis AX2. Light ray LB1 is incident on the center of objective lens 122B in the Y direction. Light ray LB1 passes through the center of objective lens 122B, and while being further converged in the Y direction, propagates toward the -Z side in the Z direction and parallel to optical axis AX2, and is imaged at the center of light-receiving surface 55a of light-receiving element 55.

[0083] 4 from the +Z side, light ray LB2 of light L2 is incident on objective lens 122A at an angle slightly larger than zero with respect to the Z direction and the optical axis AX2. The width of light ray LB2 in the Y direction coincides with the width of light ray LB1 in the Y direction at the position in the Z direction where aperture stop 62 is located, i.e., at aperture PA. Light ray LB2 passes through objective lens 122A and aperture PA of aperture stop 62 in that order, and propagates toward the -Z side while being focused in the Y direction. As it travels toward the -Z side, it moves toward the -Y side, moving away from optical axis AX2, and is incident on a portion of objective lens 122B shifted toward the -Y side from the portion where light ray LB1 is incident. The light ray LB2 passes through the objective lens 122B at the aperture PA of the aperture stop 62, and while being further focused in the Y direction, propagates toward the -Z side. As it travels toward the -Z side, it moves toward the -Y side, moving further away from the optical axis AX2, and is imaged at the -Y side end of the light receiving surface 55a of the light receiving element 55.

[0084] 4, light ray LB3 of light L2 enters objective lens 122A from the +Z side at an angle slightly larger than zero with respect to the Z direction and optical axis AX2, and at an angle opposite to light ray LB2. The width of light ray LB3 in the Y direction coincides with the widths of light rays LB1 and LB2 in the Y direction at the position in the Z direction where aperture stop 62 is located, i.e., at aperture PA. Light ray LB3 passes through objective lens 122A and aperture PA of aperture stop 62 in that order, and propagates toward the -Z side while being focused in the Y direction. As it travels toward the -Z side, it moves toward the +Y side, moving away from optical axis AX2, and enters a portion of objective lens 122B shifted toward the +Y side from the portion where light ray LB1 is incident. The light ray LB3 passes through the objective lens 122B, is further focused in the Y direction, and propagates toward the -Z side. As it travels toward the -Z side, it moves toward the +Y side, moving further away from the optical axis AX2, and is imaged at the +Y end of the light receiving surface 55a of the light receiving element 55.

[0085] 4, the objective optical system of the digital optical system in a conventional optical display device is not a telecentric optical system. Therefore, when a user adjusts the focus of the analog optical system of first lens barrel 21 and the distance from the center in the Z direction of objective lens 122A of the objective optical system of second lens barrel 22 shown in FIG. 4 to light-receiving surface 55a of light-receiving element 55 is appropriately adjusted in conjunction with the amount of focus adjustment of the analog optical system, the height of the ray of light L2 incident on light-receiving surface 55a of light-receiving element 55, i.e., the separation distance in the Y direction between light rays LB2 and LB3 incident on light-receiving element 55 and forming an image on light-receiving surface 55a, and the size in the Y direction of the image of the outside scene OW formed by light L2 change according to the amount of focus adjustment of the analog optical system. As a result, the difference between the range of the outside scene OW perceived by the user's left eye EYL through the analog optical system of first lens barrel 21 and the range of the outside scene OW received by light-receiving element 55 of second lens barrel 22 increases. In conventional optical display devices, there is a possibility that the user may feel uncomfortable due to the difference between the range of the outside scene OW viewed with the left eye EYL and the range of the outside scene OW viewed with the right eye EYR. In contrast to this, according to the optical display device 11 of the first embodiment, as shown in Fig. 2, the objective optical system 32 of the second lens barrel 22 is a telecentric optical system, and therefore the user's discomfort due to the difference between the range of the outside scene OW viewed with the left eye EYL and the range of the outside scene OW viewed with the right eye EYR can be reduced compared to conventional optical display devices.

[0086] In the optical display device 11 of the first embodiment, the objective optical system 32 of the second lens barrel 22 has an objective lens (first objective lens) 102A and an objective lens (second objective lens) 102B. The objective lens 102B is arranged in a state where it can move between the objective lens 102A on the optical axis AX2 and the light receiving element 55. The objective lens 102B is a focus adjustment lens that is arranged in a state where it can move between the objective lens 102A and the light receiving element 55 in the optical path of the light L2.

[0087] In the optical display device 11 of the first embodiment, the distance DS can be easily changed by moving the objective lens 102B between the objective lens 102A on the optical axis AX2 and the light receiving element 55, thereby adjusting the focus of the objective optical system 32 of the second lens barrel 22.

[0088] In the optical display device 11 of the first embodiment, the objective lens 102B moves between the objective lens 102A and the light receiving element 55 in accordance with the focus adjustment amount of the analog optical system of the first lens barrel 21.

[0089] In the optical display device 11 of the first embodiment, for example, when a user changes the amount of rotation of the tube main body 25B and adjusts the focus of the analog optical system of the first lens barrel 21, an electrical signal SN having information corresponding to the amount of focus adjustment of the first lens barrel 21 is output from the calculation element 80 to the moving device 58, and the positions of the objective lenses 102A, 102B on the optical axis AX2 can be automatically and easily adjusted.

[0090] In optical display device 11 of the first embodiment, it is only necessary that distance DS be adjustable in correlation with the focus adjustment amount of the analog optical system of first lens barrel 21. As a modified example of optical display device 11 of the first embodiment, for example, objective lens 102A of objective optical system 32 may be fixed to tube main body 26A and immovable on optical axis AX2, and moving device 58 may hold only objective lens 102B, and only objective lens 102B may be movable on optical axis AX2. As long as distance DS is adjustable in correlation with the focus adjustment amount of the analog optical system of first lens barrel 21, as another modified example of optical display device 11 of the first embodiment, for example, objective lens 102B may be fixed to tube main body 26A and immovable on optical axis AX2, and moving device 58 may hold only light receiving element 55, and light receiving element 55 may be arranged to be movable on optical axis AX2.

[0091] The optical display device 11 of the first embodiment further includes an aperture stop 62 that defines the diameter of the light L2 incident on the objective lens 102A, the diameter being centered on the optical axis AX2.

[0092] In the optical display device 11 of the first embodiment, by appropriately setting the size of the aperture PA of the aperture stop 62, the amount of light received by the light receiving element 55 through the objective optical system 32 in the digital optical system of the second lens barrel 22, and the brightness at the objective optical system 32 can be easily set.

[0093] In the optical display device 11 of the first embodiment, the aperture stop 62 is arranged in the optical path of the light L2 incident on the objective optical system 32, before the objective optical system 32, that is, on the outside scene OW side.

[0094] In the optical display device 11 of the first embodiment, the aperture stop 62 can be arranged on the +Z side, that is, from the outside view OW side, relative to the +Z side end of the barrel main body 26A of the second lens barrel 22, thereby preventing the device from becoming large.

[0095] In the optical display device 11 of the first embodiment, the amount of light L3 emitted from the display element 60 and the image displayed on the display surface 60e are corrected according to the focus adjustment amount of the analog optical system of the first lens barrel 21. The display element 60 emits light L3 that is received by the light receiving element 55 and corresponds to the outside scene OW.

[0096] In the optical display device 11 of the first embodiment, an image of light L2 received by the light receiving element 55 from the objective optical system 32 of the second lens barrel 22, whose focus is adjusted in accordance with the focus adjustment amount of the analog optical system of the first lens barrel 21, is emitted from the display element 60 to the -Z side as light L3 together with auxiliary images, etc., and can be displayed as video information using light L3.

[0097] [Second embodiment] Next, a second embodiment of the present invention will be described with reference to FIGS. 5 to 9. Below, only the configuration of the optical display device 12 of the second embodiment that is different from the optical display device 11 of the first embodiment will be described. Among the components of the optical display device of the second embodiment, components that are common to the optical display device 11 of the first embodiment are assigned the same reference numerals as the corresponding components of the optical display device 11 of the first embodiment. Of the components of the optical display device of the second embodiment, descriptions of the components that are common to the optical display device 11 of the first embodiment will be omitted.

[0098] Fig. 5 is a schematic diagram of optical display device 12 of the second embodiment. As shown in Fig. 5, optical display device 12 has a configuration similar to that of optical display device 11 of the first embodiment, and light receiving element 55 further includes a detection element 90. Aperture diaphragm 62 of second lens barrel 22 of optical display device 12 is aperture diaphragm 62B whose diameter dimension about optical axis AX2 of aperture PA is adjustable, and is a movable aperture diaphragm, for example, an iris diaphragm.

[0099] The detection element 90 is disposed on the optical path of light L2 that is emitted from the objective lens 102B of the objective optical system 32 and enters the light receiving element 55, and at a position that does not block the light receiving surface 55a. The detection element 90 is provided, for example, on the +Z side plate surface of the element substrate 57 of the light receiving element 55, in an area that is irradiated with the light L2 and is not covered by the cover member 56. The detection element 90 is a detector that has sensitivity to the wavelength band of light L2 and detects the luminance of the light L2 that enters the light receiving element 55, and is, for example, a photodetector that can detect visible light.

[0100] FIG. 6 is a schematic diagram of aperture diaphragm 62B as viewed from the +Z side along the Z direction, illustrating the fully open state. As shown in FIG. 6, aperture diaphragm 62B has a known configuration as an iris diaphragm, including, for example, an outer frame 71, an inner frame 72, multiple plates 74, and a rotary lever 73. The outer frame 71 is a frame member formed in an annular shape centered on the optical axis AX2. A portion of the outer frame 71 corresponding to the movable range of the rotary lever 73 in the circumferential direction about the optical axis AX2 is cut out. The inner frame 72 is a frame member formed in an annular shape centered on the optical axis AX2 and having a smaller diameter than the outer frame 71. The inner frame 72 is in contact with the outer frame 71 and is disposed on the inner circumferential surface of the outer frame 71. The rotary lever 73 extends radially outward from the inner frame 72 about the optical axis AX2, protrudes radially outward beyond the outer frame 71, and is movable in the circumferential direction within the cutout portion of the outer frame 71.

[0101] 6, the multiple plates 74 of the aperture diaphragm 62B appear within the opening of the inner frame 72 from the periphery of the inner peripheral surface of the inner frame 72. The area occupied by the multiple plates 74 appearing within the opening of the inner frame 72 correlates with the amount of movement and rotation of the rotary lever 73. In other words, the size of the opening PA of the aperture diaphragm 62B, i.e., the diameter of the opening PA about the optical axis AX2, changes depending on the amount of movement and rotation of the rotary lever 73.

[0102] In the state shown in Fig. 6, the diameter of aperture PA of aperture diaphragm 62B about optical axis AX2 is at its maximum. Fig. 7 is a schematic diagram of aperture diaphragm 62B as viewed from the +Z side along the Z direction, showing aperture PA in its most closed state. In the state shown in Fig. 7, the diameter of aperture PA of aperture diaphragm 62B about optical axis AX2 is at its minimum.

[0103] Rotation of the rotary lever 73 of the aperture diaphragm 62B and change of the diameter of the aperture PA are performed according to the luminance of the light L2 detected by the detection element 90, and may be performed electrically or manually. For example, when the rotary lever 73 is rotated electrically, information on the luminance of the light L2 detected by the detection element 90 is input from the detection element 90 to the aperture diaphragm 62B as an electrical signal. When the rotary lever 73 is rotated manually, information on the luminance of the light L2 detected by the detection element 90 is displayed in real time on the display surface 60e of the display element 60, and the user rotates the rotary lever 73 in accordance with the displayed information. In this way, the diameter of the aperture PA of the aperture diaphragm 62B and the amount of light L2 entering the objective optical system 32 from the outside scene OW are adjusted.

[0104] Aperture stop 62B and barrel main body 26A may be fastened together with screws. For example, male or female threads may be provided at a plurality of positions in the circumferential direction about optical axis AX2 on the -Z side surface of outer frame 71 of aperture stop 62B, at a portion that faces the +Z side surface of barrel main body 26A and can come into contact with each other. Male or female threads may be provided on the +Z side surface of barrel main body 26A.

[0105] 8 is a diagram for explaining the behavior of light rays LB1, LB2, and LB3 on light-receiving surface 55a of light-receiving element 55 when aperture diaphragm 62B of optical display device 12 is fully open and objective optical system 32 moves in the Z direction. For example, assume that aperture diaphragm 62B is fully open and light rays LB1, LB2, and LB3 of light L2 incident on objective optical system 32 of second lens barrel 22 are imaged on light-receiving surface 55a of light-receiving element 55 at position P1 in the Z direction as shown in FIG. 8, and are in focus.

[0106] From the above-mentioned state, when the position of the light receiving surface 55a in the Z direction does not change and the objective optical system 32 is moved to the -Z side, and the light rays LB1, LB2, and LB3 are imaged at position P5 on the -Z side of position P1, the image received by the light receiving surface 55a of the light receiving element 55 and the uncorrected image displayed on the display surface 60e of the display element 60 become blurred compared to before the objective optical system 32 was moved, and the resolution of the image viewed by the user's left eye EYL decreases compared to before the objective optical system 32 was moved.

[0107] 9 is a diagram illustrating the behavior of light rays LB1, LB2, and LB3 on the light-receiving surface 55a of the light-receiving element 55 when the aperture stop 62B of the optical display device 12 is closed from its fully open state, the diameter of the aperture PA is reduced, and the objective optical system 32 moves in the Z direction. When the diameter of the aperture PA is reduced, as shown in FIG. 9 , the amount of light L2 incident on the objective optical system 32 decreases, and the maximum angles that the light rays LB1, LB2, and LB3 form with respect to the optical axis AX2 in a plane including the X and Y directions are smaller than when the diameter of the aperture PA was reduced. When the light rays LB1, LB2, and LB3 of the light L2 incident on the objective optical system 32 of the second lens barrel 22 are imaged on the light-receiving surface 55a of the light-receiving element 55 at position P1, the image is in focus.

[0108] When the objective optical system 32 is moved to the -Z side from the above-described state without changing the position of the light-receiving surface 55a in the Z direction, and the light rays LB1, LB2, and LB3 are imaged at position P5 on the -Z side of position P1, the image received by the light-receiving surface 55a of the light-receiving element 55 and the uncorrected image displayed on the display surface 60e of the display element 60 will be blurred compared to before the movement of the objective optical system 32, but will not be blurred compared to when the aperture diaphragm 62B is fully open. The resolution of the image viewed by the user's left eye EYL will be lower compared to before the movement of the objective optical system 32, but will be improved compared to when the aperture diaphragm 62B is fully open.

[0109] That is, when the focus of objective optical system 32 of second lens barrel 22 is adjusted and the diameter of aperture PA of aperture diaphragm 62B is adjusted and the diameter increases relatively, the brightness of the image received by light receiving surface 55a of light receiving element 55 and the uncorrected image displayed on display surface 60e of display element 60 increases relatively, but the resolution of each image decreases relatively. On the other hand, when the focus of objective optical system 32 of second lens barrel 22 is adjusted and the diameter of aperture PA of aperture diaphragm 62B decreases relatively, the brightness of the image received by light receiving surface 55a of light receiving element 55 and the uncorrected image displayed on display surface 60e of display element 60 decreases relatively, but the resolution of each image increases relatively.

[0110] In a bright environment where a sufficient amount of light L1 and L2 from the outside scene OW is obtained, even if the diameter of the aperture PA of the aperture stop 62B about the optical axis AX2 is reduced, a certain amount of light L2 can be received by the light-receiving surface 55a of the light-receiving element 55. A relative decrease in brightness of the uncorrected image displayed on the display surface 60e of the display element 60 is not noticeable, and the tolerance for deviation in the Z direction of the image formation positions of the light rays LB1, LB2, and LB3 is increased, thereby deepening the depth of focus. Therefore, even if the user of the optical display device 12 adjusts the focus of the analog optical system of the first lens barrel 21 and the objective optical system 32 of the second lens barrel 22 less than when using the optical display device 11, the image of the outside scene OW is received by the light-receiving surface 55a of the light-receiving element 55 at a resolution that does not cause discomfort to the user, and is displayed on the display surface 60e of the display element 60.

[0111] Because optical display device 12 has a configuration similar to that of optical display device 11, in optical display device 12, the user can also adjust the focus of the analog optical system of first barrel 21 by rotating barrel main body 25B about optical axis AX1. The focus of objective optical system 32 of second barrel 22 is adjusted in conjunction with the focus of the analog optical system of first barrel 21, as described above. However, misalignment between the focus of the analog optical system of first barrel 21 and the focus of objective optical system 32 of second barrel 22 may occur due to a discrepancy between the amount of rotation of barrel main body 25B about optical axis AX1 and the amount of protrusion in the Z direction, or an error in the generation of electrical signal SN by computing element 80. In optical display device 12, the diameter of aperture PA of aperture diaphragm 62B is finely adjusted to correct the discrepancy between the focus of the analog optical system of first barrel 21 and the focus of objective optical system 32 of second barrel 22, thereby reducing the discrepancy.

[0112] The optical display device 12 of the second embodiment described above, like the optical display device 11 of the first embodiment, includes a first lens barrel 21 having an analog optical system including an objective optical system 31 and an eyepiece optical system 41, and a second lens barrel 22 having a digital optical system including an objective optical system 32, a light receiving element 55, a display element 60, and the eyepiece optical system 42. The first lens barrel 21 further includes a barrel main body 25B as a focus adjustment unit 70. The second lens barrel 22 further includes a movement device 58 that adjusts the distance DS from the rear end 32k of the objective optical system 32 to the light receiving surface 55a of the light receiving element 55 in accordance with the focus adjustment amount of the analog optical system of the first lens barrel 21. The objective optical system 32 is a telecentric optical system.

[0113] In the optical display device of the second embodiment, as with the optical display device 11 of the first embodiment, it is possible to reduce the discomfort felt by the user due to the difference between the range of the outside scene OW viewed by the left eye EYL using light L1 from the first lens barrel 21 and the range of the outside scene OW viewed by the right eye EYR using light L3 from the second lens barrel 22.

[0114] The optical display device of the second embodiment further includes the same configuration as the optical display device 11 of the first embodiment, and therefore provides the same effects as those of the optical display device 11 described in the first embodiment.

[0115] In the optical display device 12 of the second embodiment, in addition to the optical display device 11 of the first embodiment, the light receiving element 55 further includes a detection element 90. The detection element 90 detects the luminance of light L2 incident on the light receiving element 55. In the optical display device of the second embodiment, the diameter dimension of the aperture PA of the aperture stop 62B is changed according to the luminance of the light L2 detected by the detection element 90.

[0116] In optical display device 12 of the second embodiment, the diameter of aperture PA of aperture diaphragm 62B is adjusted according to the brightness and light amount of light L2 incident on light receiving element 55. According to optical display device 12 of the second embodiment, the diameter of aperture PA of aperture diaphragm 62B is adjusted appropriately, so the amount of focus adjustment of the analog optical system of first lens barrel 21 by the user and the amount of focus adjustment of objective optical system 32 of second lens barrel 22 that is linked to the amount of focus adjustment of first lens barrel 21 can be reduced compared to optical display device 12 of the first embodiment, and further, the difference between the amount of focus adjustment of the analog optical system of first lens barrel 21 and the amount of focus adjustment of objective optical system 32 of second lens barrel 22 can also be reduced.

[0117] As a modified example of the optical display device 12 of the second embodiment, instead of the aperture diaphragm 62B, a plurality of aperture diaphragms 62 having apertures PA with different radii may be prepared, and the aperture diaphragm 62 having the aperture PA formed with a diameter dimension more suitable for the environment during use may be selectively installed at the +Z side end of the tube body 26.

[0118] Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various modifications and changes are possible within the scope of the gist of the present invention as described in the claims.

[0119] For example, while the optical display devices 11 and 12 in the above-described embodiments are IF-type binoculars, they may also be configured as CF (Center Focus)-type binoculars. In this case, a focusing ring is provided as the focus adjustment unit 70 at the -Z end of the connecting portion 24. At least one objective lens 101 of the objective optical system 31 of the first lens barrel 21 is supported by a moving device that can move in the Z direction. At least one objective lens 102 of the objective optical system 32 of the second lens barrel 22 is also supported by a moving device 58. The focusing ring is rotatable around the central axis JX, and moves the moving device supporting the objective lens 101 and the moving device 58 in the Z direction and along the optical axes AX1 and AX2 in response to the amount of rotation. Note that in the analog optical system of the first lens barrel 21, a relay lens may be disposed on the optical axis AX1 between the objective optical system 31 and the eyepiece optical system 41, and the relay lens may be supported by the moving device. The user can adjust the focus of the analog optical system of the first lens barrel 21 and the focus of the objective optical system 32 of the second lens barrel 22 by adjusting the amount of rotation of the focusing ring.

[0120] For example, in the optical display devices 11 and 12 of the above-described embodiments, the first lens barrel 21 and the second lens barrel 22 may be arranged inversely in the X direction. In this case, the user can view with the left eye EYL an image of the outside scene OW displayed on the display surface 60e of the display element 60 of the second lens barrel 22, and with the right eye EYR a direct image of the outside scene OW arriving from the analog optical system of the first lens barrel 21.

[0121] For example, the optical display device 11 of the first embodiment and the optical display device 12 of the second embodiment described above are binoculars, but the optical display device of the present invention is applicable to head-mounted display devices such as head-mounted displays (HMDs), and may also be applied appropriately to optical devices other than head-mounted display devices.

[0122] Summary of this disclosure A summary of this disclosure is provided below. (Supplementary Note 1) An optical display device comprising: a first lens barrel having a first objective optical system into which light from an external scene is incident and a first eyepiece optical system that emits light that is incident on the first objective optical system; and a second lens barrel having a second objective optical system into which light from the external scene is incident, a light receiving element that receives light that is incident on the second objective optical system, a display element that emits image light in accordance with the light received by the light receiving element, and a second eyepiece optical system that emits the image light, wherein the first lens barrel further has a focus adjustment unit that adjusts the focus, and the second lens barrel further has a distance change unit that changes the distance on the optical axis from the rear end of the second objective optical system to the light receiving surface of the light receiving element in accordance with the amount of focus adjustment of the first lens barrel, and the second objective optical system is a telecentric optical system.

[0123] With the configuration of Appendix 1, even when the focus of the second objective optical system of the second lens barrel is adjusted in accordance with the focus adjustment amount of the analog optical system including the first objective optical system and the first eyepiece optical system of the first lens barrel, the height of the light rays passing through the second objective optical system and incident on the light receiving element does not change, so the difference between the range of the outside scene seen through the first lens barrel, the range of the outside scene received by the light receiving element of the second lens barrel, and the range of the image of the outside scene seen from the display element is reduced, thereby reducing the sense of discomfort felt by the user.

[0124] (Appendix 2) The optical display device of Appendix 1, wherein the second objective optical system has a first objective lens and a second objective lens that is movable between the first objective lens on the optical axis and the light receiving element.

[0125] The configuration of Supplementary Note 2 makes it possible to easily adjust the focus of the second objective optical system of the second lens barrel.

[0126] (Appendix 3) The optical display device of Appendix 2, wherein the second objective lens moves between the first objective lens on the optical axis of the second objective optical system and the light receiving element in accordance with the focus adjustment amount of the first lens barrel.

[0127] The configuration of Supplementary Note 3 makes it possible, for example, to automatically adjust the focus of the second objective optical system in the second lens barrel in accordance with the amount of focus adjustment of the analog optical system in the first lens barrel.

[0128] (Supplementary Note 4) The optical display device according to Supplementary Note 2 or Supplementary Note 3, wherein the second lens barrel further includes an aperture stop that defines a diameter of light incident on the first objective lens.

[0129] The configuration of Supplementary Note 4 makes it possible to easily adjust the brightness of the second objective optical system in the second lens barrel and the brightness of the image of the outside scene displayed on the display element and visually recognized by the user.

[0130] (Appendix 5) An optical display device according to Appendix 4, further comprising a detection element for detecting the brightness of light incident on the light receiving element, wherein the diameter dimension of the opening of the aperture stop is changed according to the brightness detected by the detection element.

[0131] The configuration of Appendix 5 allows the diameter of the aperture of the aperture stop to be changed according to the amount of light incident on the second objective optical system of the second lens barrel, and makes it possible to easily adjust the brightness of the second objective optical system in the second lens barrel and the brightness of the image of the external scene displayed on the display element and visible to the user.

[0132] (Supplementary Note 6) The optical display device according to Supplementary Note 4 or Supplementary Note 5, wherein the aperture stop is disposed in a stage before the first objective lens in the optical path of light incident on the second objective optical system.

[0133] With the configuration of Supplementary Note 6, the aperture stop is located at the front end of the second barrel, i.e., at the end on the light incident side, and operations such as changing the diameter of the aperture and attaching and detaching the aperture stop can be easily performed.

[0134] (Appendix 7) An optical display device according to any one of appendices 1 to 6, wherein the display element is corrected according to the focus adjustment amount of the first lens barrel and emits the image light corresponding to the external scene received by the light receiving element.

[0135] The configuration of Supplementary Note 7 allows the display element to display an image corrected in accordance with the focus adjustment amount of the analog optical system of the first lens barrel, allowing the user to view it. [Explanation of symbols]

[0136] 11...optical display device, 21...first lens barrel, 22...second lens barrel, 31...objective optical system (first objective optical system), 32...objective optical system (second objective optical system), 41...ocular optical system (first eyepiece optical system), 42...ocular optical system (second eyepiece optical system), 55...light receiving element, 60...display element.

Claims

1. a first lens barrel having a first objective optical system into which light from an external scene is incident and a first eyepiece optical system from which light incident on the first objective optical system is emitted; a second lens barrel including a second objective optical system into which light from an external scene is incident, a light receiving element that receives the light that is incident on the second objective optical system, a display element that emits image light in response to the light received by the light receiving element, and a second eyepiece optical system that emits the image light; Equipped with the first lens barrel further includes a focus adjustment unit that adjusts focus, the second lens barrel further includes a distance changer that changes a distance on the optical axis from a rear end of the second objective optical system to a light receiving surface of the light receiving element in accordance with a focus adjustment amount of the first lens barrel, the second objective optical system is a telecentric optical system; Optical display device.

2. The second objective optical system is A first objective lens; a second objective lens movable between the first objective lens and the light receiving element on the optical axis; having The optical display device according to claim 1 .

3. the second objective lens moves between the first objective lens on the optical axis of the second objective optical system and the light receiving element in accordance with a focus adjustment amount of the first lens barrel; The optical display device according to claim 2 .

4. the second lens barrel further includes an aperture stop that defines the diameter of light incident on the first objective lens; 4. The optical display device according to claim 2 or 3.

5. a detection element for detecting the brightness of light incident on the light receiving element, a diameter dimension of the aperture of the aperture stop is changed in accordance with the luminance detected by the detection element; 5. The optical display device according to claim 4.

6. the aperture stop is disposed in a stage before the first objective lens in the optical path of light incident on the second objective optical system; 5. The optical display device according to claim 4.

7. the display element is corrected in accordance with a focus adjustment amount of the first lens barrel and emits the image light corresponding to the outside scene received by the light receiving element; The optical display device according to any one of claims 1 to 3.

Images