Optical system, eyepiece, and optical device

Abstract

The present application provides an optical system, an eyepiece, and an optical device. The optical system comprises a display screen and a second pancake composite film which are sequentially arranged along an optical axis, wherein the display screen is used for displaying image information; a transflective film and a first pancake composite film are provided between the display screen and the second pancake composite film; the transflective film or the first pancake composite film is close to the display screen; and the first pancake composite film, the transflective film, and the second pancake composite film are used for folding light emitted by the display screen and then transmitting the light to human eyes. The optical system, the eyepiece, and the optical device provided by the present application effectively reduce the volume and weight of the optical system, thereby reducing production costs.

Description

Optical system, eyepiece and optical device TECHNICAL FIELD

[0001] The present application relates to the technical field of optical devices, in particular to an optical system, an eyepiece and an optical device. BACKGROUND

[0002] At present, eyepiece lenses are widely used in optical fields such as telescopes, microscopes and sighting scopes. The lenses in traditional eyepieces are made of glass or plastic, and light propagates in one direction in the eyepiece. In order to meet certain specific optical index requirements, the eyepiece has to use more lenses or aspherical surfaces to meet the imaging requirements during optical design, which increases the volume, weight and cost of the eyepiece.

[0003] At present, Pancake technology has been used in the field of VR (Virtual Reality) technology to make the overall volume of the lens smaller and the weight lighter. Pancake technology further compresses the thickness of the optical module and improves the immersion and wearing comfort of users. The key point of the Pancake optical scheme is to fold the optical path through the lens of the semi-transparent and semi-reflective polarizing film, then perform multiple returns, and finally shoot into the human eye. Although Pancake technology reduces the volume and weight of the eyepiece to some extent, there is still a large space for improvement in the eyepiece in the prior art to further improve the user experience. SUMMARY

[0004] Therefore, the present application provides an optical system, an eyepiece and an optical device to solve the problem that the volume and weight of the eyepiece in the prior art are still large.

[0005] To achieve the above-mentioned purpose, the technical scheme of the embodiments of the present application is as follows:

[0006] In a first aspect, the embodiments of the present application provide an optical system, comprising.

[0007] In one of the embodiments, the optical system comprises a display screen and a second pancake composite film arranged along an optical axis in sequence, the display screen being used to display image information; a semi-transparent and semi-reflective film and a first pancake composite film are arranged between the display screen and the second pancake composite film, the semi-transparent and semi-reflective film or the first pancake composite film being arranged close to the display screen; the first pancake composite film, the semi-transparent and semi-reflective film and the second pancake composite film are used to fold and transmit the light emitted by the display screen to the human eye.

[0008] In one of the embodiments, at least two lenses are arranged along the optical axis of the display screen, wherein the first pancake composite film and / or the semi-transparent semi-reflective film are arranged on the lens close to the display screen, and the second pancake composite film is arranged on the lens away from the display screen.

[0009] In one of the embodiments, the display screen, the first lens, the second lens and the third lens are arranged along the optical axis in sequence.

[0010] The surface of the third lens close to the second lens is provided with the second pancake composite film; the surface of the first lens close to the display screen is provided with the semi-transparent semi-reflective film; and the first pancake composite film is arranged on the surface of the display screen close to the first lens, or on the first lens, or on the second lens.

[0011] In one of the embodiments, the first lens is a convex-concave lens, the radius of curvature of the surface of the first lens close to the display screen is 130-180 mm, the radius of curvature of the surface of the first lens close to the second lens is 10-60 mm, and the focal length of the first lens is -10--100 mm.

[0012] The second lens is a double convex lens, the radius of curvature of the surface of the second lens close to the first lens is 80-140 mm, the radius of curvature of the surface of the second lens close to the third lens is 10-60 mm, and the focal length of the second lens is 5-85 mm.

[0013] The third lens is a plano-convex lens, the radius of curvature of the surface of the third lens close to the second lens is infinite, the radius of curvature of the surface of the third lens away from the second lens is -140--200 mm, and the focal length of the third lens is 125-215 mm.

[0014] In one of the embodiments, the display screen, the first lens and the second lens are arranged along the optical axis in sequence.

[0015] The surface of the second lens close to the first lens is provided with the second pancake composite film; the surface of the first lens close to the display screen is provided with the semi-transparent semi-reflective film; and the first pancake composite film is arranged on the surface of the display screen close to the first lens, or on the first lens.

[0016] The first lens is a double-concave lens, a radius of curvature of a surface of the first lens close to the display screen is -120mm to -140mm, a radius of curvature of a surface of the first lens close to the second lens is 140mm to 160mm, and a focal length of the first lens is -120mm to -170mm.

[0017] In one of the embodiments, the second lens is a concave-convex lens, a radius of curvature of a surface of the second lens close to the first lens is -20mm to -40mm, a radius of curvature of a surface of the second lens away from the first lens is -20mm to -40mm, and a focal length of the second lens is 20mm to 90mm.

[0018] In one of the embodiments, the display screen, the first lens, the second lens, the third lens, and the fourth lens are sequentially arranged along an optical axis.

[0019] A second pancake composite film is arranged on a surface of the fourth lens close to the third lens, a semi-transmission semi-reflection film is arranged on a surface of the second lens close to the display screen, and the first pancake composite film is arranged on a surface of the display screen close to the first lens, or on the first lens, or on the second lens, or on the third lens.

[0020] In one of the embodiments, the first lens is a plano-convex lens, a radius of curvature of a surface of the first lens close to the display screen is -200mm to infinity, a radius of curvature of a surface of the first lens close to the second lens is -90mm to -110mm, and a focal length of the first lens is 80mm to 150mm.

[0021] The second lens is a convex-concave lens, a radius of curvature of a surface of the second lens close to the first lens is 300mm to 500mm, a radius of curvature of a surface of the second lens away from the first lens is 40mm to 60mm, and a focal length of the second lens is -30mm to -90mm.

[0022] The third lens is a plano-convex lens, a radius of curvature of a surface of the third lens close to the first lens is -200mm to infinity, a radius of curvature of a surface of the third lens away from the first lens is -20mm to -40mm, and a focal length of the third lens is 20mm to 80mm.

[0023] The fourth lens is a plano-convex lens, a radius of curvature of a surface of the fourth lens close to the first lens is 200mm to infinity, a radius of curvature of a surface of the fourth lens away from the first lens is -120mm to -140mm, and a focal length of the fourth lens is 130mm to 220mm.

[0024] In one of the embodiments, the first pancake composite film comprises a first quarter-wave plate and a first linear polarizer arranged in sequence, and the first linear polarizer is arranged on the side close to the display screen.

[0025] In one of the embodiments, the second pancake composite film comprises a second quarter-wave plate, a polarized reflective film and a second linear polarizer arranged in sequence, and the second linear polarizer is arranged on the side away from the display screen.

[0026] In one of the embodiments, the exit pupil distance of the optical system is 20-70 mm.

[0027] In the second aspect, the embodiments of the present application provide an eyepiece comprising the optical system as described above.

[0028] In one of the embodiments, the eyepiece further comprises an eyepiece barrel and a power adjustment member; the optical system is arranged in the eyepiece barrel, and the power adjustment member is used for power adjustment of the eyepiece.

[0029] In one of the embodiments, the eyepiece further comprises a whole-machine adapter, and the whole-machine adapter comprises a ring-shaped side wall, and at least one limiting groove is arranged on the side wall.

[0030] The eyepiece barrel is partially arranged in the whole-machine adapter, a limiting member corresponding to the limiting groove is arranged on the outer wall of the eyepiece barrel, and the limiting member is arranged in the corresponding limiting groove.

[0031] The power adjustment member is sleeved on the whole-machine adapter, and the power adjustment member is movably connected with the whole-machine adapter and is connected with the limiting member in linkage.

[0032] The power adjustment member is used for limiting and guiding the limiting member through the limiting groove, so that the power adjustment member drives the limiting member to further drive the eyepiece barrel to move in the axial direction of the whole-machine adapter in the whole-machine adapter.

[0033] In one of the embodiments, an annular groove is arranged on the inner wall of the power adjustment member, and the annular groove is used for accommodating the limiting member passing through the limiting groove; the power adjustment member is used for rotating relative to the whole-machine adapter, and the power adjustment member drives the eyepiece barrel to move in the axial direction of the whole-machine adapter through the cooperation between the annular groove and the limiting member.

[0034] And / or, the limiting member is a limiting pin, one end of the limiting pin is fixedly connected with the outer wall of the eyepiece barrel, and the other end of the limiting pin is inserted into the annular groove after passing through the limiting groove.

[0035] In one of the embodiments, the diopter adjusting member comprises a threaded adapter and a diopter adjusting hand wheel, the diopter adjusting hand wheel is sleeved outside the threaded adapter and is fastened to the threaded adapter;

[0036] The inner wall of the diopter adjusting hand wheel is convexly provided with an annular limiting ring, a gap between the annular limiting ring and the threaded adapter forms the annular groove, the inner wall of the threaded adapter is provided with an internal thread, and the outer wall of the whole machine adapter is provided with an external thread matched with the internal thread of the threaded adapter.

[0037] In a third aspect, the embodiments of the present application provide an optical device comprising the eyepiece as described above.

[0038] The optical system provided by the present application has at least the following beneficial effects: the optical system provided by the present application is provided with a display screen, a first pancake composite film, a second pancake composite film and a semi-transmissive and semi-reflective film, so that light rays propagate in the optical system by reflection and transmission, the folded optical path is realized, the volume and weight of the optical system are effectively reduced, the production cost of the optical system is reduced, and the user has a better experience. The eyepiece and the optical device provided by the present application comprise the optical system described above, and therefore also have the beneficial effects described above. BRIEF DESCRIPTION OF DRAWINGS

[0039] FIG. 1 is a structural schematic diagram of an optical system according to an embodiment of the present application.

[0040] FIG. 2 is a light path schematic diagram of the optical system of FIG. 1.

[0041] FIG. 3 is a schematic diagram of the change of the polarization state of light rays in the optical system according to an embodiment of the present application.

[0042] FIG. 4 is a sectional view of an eyepiece according to an embodiment of the present application.

[0043] FIG. 5 is an exploded view of the eyepiece according to an embodiment of the present application.

[0044] FIG. 6 is a structural schematic diagram of an optical system according to another embodiment of the present application.

[0045] FIG. 7 is a structural schematic diagram of an optical system according to still another embodiment of the present application.

[0046] The meanings of various reference signs in the drawings are as follows: 1, whole machine adapter; 2, limiting groove; 3, eyepiece lens barrel; 4, sealing ring; 5, limiting piece; 6, annular groove; 7, threaded adapter; 8, diopter adjustment hand wheel; 9, annular limiting ring; 10, third lens; 11, second pancake composite film; 111, second quarter-wave plate; 112, polarized reflection film; 113, second linear polarizer; 12, display screen; 13, first pancake composite film; 131, first quarter-wave plate; 132, first linear polarizer; 14, silica gel eyecup; 15, eyecup adapter; 16, first spacer ring; 17, second spacer ring; 18, annular compression ring; 19, first lens; 191, half-mirror film; 20, second lens; 21, diopter adjustment piece; 22, installation control line; 23, exit pupil position; 24, fourth lens. DETAILED DESCRIPTION

[0047] The technical solutions of the present application are further described in detail below in combination with the drawings and specific embodiments.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the implementation of the application. As used in this description, the terms "and / or" includes any and all combinations of one or more of the associated listed items.

[0049] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0050] In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication between the two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0051] Referring to FIGS. 1-3, the optical system of the embodiment of the present application comprises a display screen 12 and a second pancake composite film 11 arranged in sequence along an optical axis, the display screen 12 being configured to display image information; a half-transmission half-reflection film 191 and a first pancake composite film 13 are arranged between the display screen 12 and the second pancake composite film 11, the half-transmission half-reflection film 191 or the first pancake composite film 13 being arranged close to the display screen 12; the first pancake composite film 13, the half-transmission half-reflection film 191 and the second pancake composite film 11 are configured to fold the light emitted by the display screen 12 and then transmit the light to the human eye. Through the arrangement of the above-mentioned film layers, the optical system realizes the folding of the optical path, so that the light can be refracted and reflected in the optical system, i.e., the light can propagate back and forth in the lens, thereby realizing the shortening of the total length of the lens. The first pancake composite film 13 is configured to form polarized light, and the second pancake composite film 11 is configured to change the type of the polarized light, thereby changing the propagation direction of the light, and the half-transmission half-reflection film 191 is configured to cooperate with the first pancake composite film 13 to achieve the effect of folding the optical path.

[0052] The display screen 12 is provided with at least two lenses in the direction of the optical axis, wherein the first pancake composite film 13 and / or the half-transmission half-reflection film 191 are arranged on the lens close to the display screen 12, and the second pancake composite film 11 is arranged on the lens away from the display screen 12.

[0053] Further, the exit pupil distance of the optical system can be set to 20-70 mm, so that the optical system can still maintain a large exit pupil range on the basis of the shortening of the total length of the lens.

[0054] Specifically, in some embodiments, the optical system comprises a display screen 12, a first lens 19, a second lens 20 and a third lens 10 arranged in sequence along an optical axis.

[0055] As shown in FIGS. 1 and 2, the display screen 12 is provided with a first pancake composite film 13 on the side surface close to the first lens 19. The display screen 12 in the embodiment is a micro display screen 12 configured to display the picture information to be output, and the diagonal length of the effective display area of the screen is 14-16 mm. Specifically, the display screen 12 is a high-brightness screen. The first pancake composite film 13 comprises a first quarter-wave plate 131 and a first linear polarizer 132 arranged in sequence, and the first linear polarizer 132 is arranged on the side close to the display screen 12. The first pancake composite film 13 is attached to the surface of the display screen 12 and comprises two layers, the inner layer is a linear polarizer capable of transmitting only polarized light in a specific direction, and in this case, the first linear polarizer 132 is configured to transmit linearly polarized light P. The outer layer is a first quarter-wave plate 131 configured to generate phase delay, so as to convert linearly polarized light and circularly polarized light into each other. The distance between the display screen 12 and the first lens 19 is greater than 5 mm.

[0056] The first lens 19 is a convex-concave lens with negative focal power. The radius of curvature of the surface of the first lens 19 close to the display screen 12 is 130-180 mm, preferably 150-160 mm. The radius of curvature of the surface of the first lens 19 close to the second lens 20 is 10-60 mm, preferably 30-40 mm. The focal length of the first lens 19 is -10--100 mm, preferably -50--60 mm. The surface of the first lens 19 close to the display screen 12 is provided with a semi-transmissive semi-reflective film 191. The semi-transmissive semi-reflective film 191 is attached to the surface of the first lens 19 close to the display screen 12 and can transmit and reflect light. The transmittance and reflectance ratio is 1:1. The semi-transmissive semi-reflective film 191 is an important component for realizing the back-and-forth propagation of light in the lens.

[0057] The second lens 20 is a biconvex lens with positive focal power. The radius of curvature of the surface of the second lens 20 close to the first lens 19 is 80-140 mm, preferably 100-120 mm. The radius of curvature of the surface of the second lens 20 close to the third lens 10 is 10-60 mm, preferably 30-40 mm. The focal length of the second lens 20 is 5-85 mm, preferably 35-45 mm.

[0058] The third lens 10 is a plano-convex lens with positive focal power. The radius of curvature of the surface of the third lens 10 close to the second lens 20 is infinite, i.e., the surface of the third lens 10 close to the second lens 20 is nearly flat. The radius of curvature of the surface of the third lens 10 away from the second lens 20 is -140--200 mm, preferably -160--180 mm. The focal length of the third lens 10 is 125-215 mm, preferably 165-175 mm. The distance between the surface of the third lens 10 away from the second lens 20 and the display screen 12 is not greater than 22 mm. The surface of the third lens 10 close to the second lens 20 is provided with a second pancake composite film 11. The second pancake composite film 11 comprises a second quarter-wave plate 111, a polarization reflection film 112 and a second linear polarizer 113 arranged in sequence. The second linear polarizer 113 is arranged on the side close to the third lens 10. The second pancake composite film 11 is attached to the surface of the third lens 10 close to the second lens 20 and comprises three layers. The composite film is an important component for realizing the back-and-forth propagation of light in the lens. The second quarter-wave plate 111 is used to produce phase delay. The polarization reflection film 112 is used to reflect linearly polarized light P and transmit linearly polarized light S. The second linear polarizer 113 is used to transmit linearly polarized light in a specific direction, which is used to transmit linearly polarized light S in this case.

[0059] The human eye can see a complete screen image when the eye is in the pupil position 23. In some embodiments, the exit pupil distance of the optical system can be 30-40 mm, and the exit pupil diameter can be 2.5-4 mm.

[0060] The first pancake composite film 13 of the embodiment can be arranged on the surface of the display screen 12 close to the first lens 19, or on the first lens 19, or on the second lens 20. For example, the first pancake composite film 13 can be arranged on the surface of the transflector 191 close to the display screen 12, or on the surface of the transflector 191 close to the first lens 19, or on the two surfaces of the second lens 20.

[0061] The optical principle of the optical system of the embodiment is as follows: as shown in FIGS. 2 and 3, the light emitted by the display screen 12 passes through the first linear polarizer 132, and the polarization state becomes linearly polarized light P. After passing through the first quarter-wave plate 131, the phase delay becomes right circularly polarized light R. When the light passes through the transflector 191, half of the incident light is transmitted, and the other half of the incident light is reflected. The polarization state of the transmitted light does not change, and it is still right circularly polarized light R, which continues to propagate forward. When the right circularly polarized light R enters the second quarter-wave plate 111, the phase delay occurs, and the right circularly polarized light R becomes linearly polarized light P. When the linearly polarized light P reaches the polarization reflection film 112, since the polarization reflection film 112 has the function of reflecting linearly polarized light P and transmitting linearly polarized light S, the linearly polarized light P is reflected by the polarization reflection film 112, and becomes right circularly polarized light R again when passing through the second quarter-wave plate 111, and continues to propagate forward to the transflector 191. At the transflector 191, half of the incident light is transmitted, and the other half of the incident light is reflected. The polarization state of the reflected light changes from right circularly polarized light R to left circularly polarized light L, and propagates forward to the second quarter-wave plate 111 again. The left circularly polarized light L becomes linearly polarized light S at the second quarter-wave plate 111, and propagates forward to the human eye direction after being transmitted by the polarization reflection film 112 and the second linear polarizer 113.

[0062] As shown in FIG. 6, in some embodiments, the optical system includes the display screen 12, the first lens 19, and the second lens 20 arranged in sequence along the optical axis.

[0063] The surface of the second lens 20 close to the first lens 19 is provided with the second pancake composite film 11; the surface of the first lens 19 close to the display screen 12 is provided with the transflector 191; and the first pancake composite film 13 is arranged on the surface of the display screen 12 close to the first lens 19, or on the first lens 19.

[0064] The first lens 19 is a double-concave lens, the radius of curvature of the surface of the first lens 19 close to the display screen 12 is -120 to -140 mm, the radius of curvature of the surface of the first lens 19 close to the second lens 20 is 140 to 160 mm, and the focal length of the first lens 19 is -120 to -170 mm.

[0065] The second lens 20 is a concave-convex lens, the radius of curvature of the surface of the second lens 20 close to the first lens 19 is -20 to -40 mm, the radius of curvature of the surface of the second lens 20 away from the first lens 19 is -20 to -40 mm, and the focal length of the second lens 20 is 20 to 90 mm.

[0066] As shown in FIG. 7, in some embodiments, the optical system comprises, in sequence along the optical axis, the display screen 12, the first lens 19, the second lens 20, the third lens 10 and the fourth lens 24.

[0067] The fourth lens 24 is provided with the second pancake composite film 11 on the surface close to the third lens 10; the second lens 20 is provided with the semi-transmission semi-reflection film 191 on the surface close to the display screen 12; and the first pancake composite film 13 is arranged on the surface of the display screen 12 close to the first lens 19, or on the first lens 19, or on the second lens 20, or on the third lens 10.

[0068] The first lens 19 is a plano-convex lens, the radius of curvature of the surface of the first lens 19 close to the display screen 12 is -200 mm to infinity, the radius of curvature of the surface of the first lens 19 close to the second lens 20 is -90 to -110 mm, and the focal length of the first lens 19 is 80 to 150 mm.

[0069] The second lens 20 is a convex-concave lens, the radius of curvature of the surface of the second lens 20 close to the first lens 19 is 300 to 500 mm, the radius of curvature of the surface of the second lens 20 away from the first lens 19 is 40 to 60 mm, and the focal length of the second lens 20 is -30 to -90 mm.

[0070] The third lens 10 is a plano-convex lens, the radius of curvature of the surface of the third lens 10 close to the first lens 19 is -200 mm to infinity, the radius of curvature of the surface of the third lens 10 away from the first lens 19 is -20 to -40 mm, and the focal length of the third lens 10 is 20 to 80 mm.

[0071] The fourth lens 24 is a plano-convex lens, the radius of curvature of the surface of the fourth lens 24 close to the first lens 19 is 200 mm to infinity, the radius of curvature of the surface of the fourth lens 24 away from the first lens 19 is -120 to -140 mm, and the focal length of the fourth lens 24 is 130 to 220 mm.

[0072] The optical systems of the two lenses, the three lenses and the four lenses of the above embodiments have the same overall working principle, and the parameters such as the screen size, the exit pupil diameter and the exit pupil distance are set to be the same.

[0073] The optical system provided by the embodiments of the present application shortens the total length of the lens by designing the folding light path, so that the light can be refracted and reflected in the optical system, that is, the light can propagate back and forth in the lens, thereby realizing the shortening of the total length of the lens. Since the light passes through the same lens multiple times, the number of light paths in the optical system is several times the length of the optical system, so the imaging effect that can be presented by a large number of lenses in a traditional optical system can be realized with fewer lenses. Compared with the traditional optical system, the optical system of the embodiments of the present application has a greatly shortened total length, has an ultra-short total length (TTL), has a small weight, has a large object plane, has a large exit pupil distance, is suitable for a sighting scope, and has good imaging quality, thereby effectively improving the user experience.

[0074] The embodiments of the present application also provide an ocular lens comprising the optical system of the above embodiments. In some embodiments, the ocular lens can further comprise an ocular lens barrel 3 and a power adjustment member 21. The optical system is arranged in the ocular lens barrel 3, and the power adjustment member 21 is used for power adjustment of the ocular lens.

[0075] The currently known power adjustment mechanism of the ocular lens is mainly to directly arrange an adjustment screw on the ocular lens barrel 3, and to realize the movement of the ocular lens barrel 3 by rotating the ocular lens barrel 3, so as to realize the power adjustment. In the adjustment process, the optical axis of the ocular lens barrel 3 rotates. Although the transmission of the adjustment mechanism does not need to arrange a complex transmission structure in the axial direction, the rotation of the optical axis of the ocular lens barrel 3 may affect the imaging effect, especially for the ocular lens with a polarizing plate, a wave plate and other polarizing optical elements, the rotation of the optical axis will affect the imaging quality.

[0076] Therefore, the inventors of the present application propose the technical concept that after the limiting member 5 is inserted into the limiting groove 2, the limiting groove 2 limits the rotation of the ocular lens barrel 3 connected with the limiting member 5 around the axis thereof, and limits the movement stroke of the limiting member 5, thereby limiting the movement stroke of the ocular lens barrel 3 in the whole machine adapter 1. The power adjustment member 21 is movably connected with the whole machine adapter 1, and is connected with the limiting member 5 arranged in the limiting groove 2 on the ocular lens barrel 3 in linkage. When the power adjustment member 21 moves, the limiting groove 2 limits and guides the limiting member 5, the power adjustment member 21 drives the limiting member 5 to drive the ocular lens barrel 3 to move in the whole machine adapter 1 along the axial direction of the whole machine adapter 1 synchronously, so as to complete the power adjustment of the ocular lens. The technical scheme based on the technical concept is described in detail in the specific embodiments below.

[0077] Referring to FIG. 4 and FIG. 5, in some embodiments, the eyepiece can further include a whole machine adapter 1, an eyepiece barrel 3, and a power adjustment member 21. The whole machine adapter 1 includes a ring-shaped side wall, and the side wall is provided with a limiting groove 2. The eyepiece barrel 3 is arranged in the whole machine adapter 1, and the outer wall of the eyepiece barrel 3 is provided with a limiting member 5 corresponding to the limiting groove 2, and the limiting member 5 is arranged in the corresponding limiting groove 2. Optionally, the user can set one or more limiting grooves 2 according to the needs, which is not limited herein. The power adjustment member 21 is sleeved on the whole machine adapter 1, and the power adjustment member 21 and the whole machine adapter 1 are connected through thread cooperation (in this embodiment, the movable connection between the power adjustment member 21 and the whole machine adapter 1 is through thread cooperation, and in other embodiments, the movable connection between the power adjustment member 21 and the whole machine adapter 1 can also be selected in other ways, which can be determined according to the actual needs of the product, and is not limited herein, as long as the power adjustment member 21 can move relative to the whole machine adapter 1), and the power adjustment member 21 and the limiting member 5 arranged in the limiting groove 2 of the eyepiece barrel 3 are connected in linkage. When the power adjustment member 21 is adjusted by rotating, the power adjustment member 21 moves up and down on the outside of the whole machine adapter 1 through the change of thread engagement, and then the power adjustment member 21 can drive the limiting member 5, and the limiting member 5 moves axially along the axial direction of the whole machine adapter 1 under the limitation of the limiting groove 2, so that the power adjustment member 21 drives the eyepiece barrel 3 to move synchronously along the axial direction of the whole machine adapter 1 inside the whole machine adapter 1 through the limiting member 5, so as to complete the adjustment of the power of the eyepiece.

[0078] The eyepiece provided by the above embodiment has the eyepiece barrel 3 arranged in the whole machine adapter 1, the limiting groove 2 is arranged on the side wall of the whole machine adapter 1, the limiting member 5 is arranged on the outer wall of the eyepiece barrel 3, and after the limiting member 5 is arranged in the limiting groove 2, the limiting groove 2 limits the eyepiece barrel 3 connected with the limiting member 5, so that the eyepiece barrel 3 cannot rotate around its own axis, and the movement stroke of the limiting member 5 is limited, thereby limiting the movement stroke of the eyepiece barrel 3 in the whole machine adapter 1. The power adjustment member 21 is sleeved on the outside of the whole machine adapter 1, and the power adjustment member 21 and the whole machine adapter 1 are connected through thread cooperation. In the power adjustment process, through the cooperation of the limiting groove 2 and the limiting member 5, and through the linkage connection of the limiting member 5 arranged in the eyepiece barrel 3 and the power adjustment member 21, the power adjustment member 21 moves synchronously along the axial direction of the whole machine adapter 1 inside the whole machine adapter 1 through the limiting member 5 during the rotating adjustment process, and the eyepiece barrel 3 is limited not to rotate, so that the optical axis of the eyepiece does not rotate. Compared with the known adjustment mechanism, the adjustment mechanism of the embodiment can reduce the occupation of the axial space of the eyepiece and simplify the axial size of the eyepiece.

[0079] Please refer to FIG. 4 and FIG. 5, in some embodiments, the inner wall of the diopter adjustment member 21 is provided with an annular groove 6, the annular groove 6 accommodates the end of the limiting member 5 passing through the limiting groove 2, that is, the linkage connection of the diopter adjustment member 21 and the limiting member 5 is realized, the diopter adjustment member 21 is threadedly connected with the whole machine adapter 1, when the diopter adjustment member 21 rotates, the diopter adjustment member 21 can move forward and backward along the axial direction of the whole machine adapter 1, the limiting member 5 is inserted into the annular groove 6, the two opposite groove walls of the annular groove 6 of the diopter adjustment member 21 can push the limiting member 5 to move along the limiting groove, so as to drive the ocular lens barrel 3 to move synchronously, so as to complete the adjustment of the diopter of the ocular lens, when the diopter adjustment member 21 rotates to adjust the diopter, the groove wall of the annular groove 6 pushes the limiting member 5, and the annular groove 6 of the diopter adjustment member 21 can rotate relative to the limiting member 5.

[0080] As shown in FIG. 4 and FIG. 5, in some embodiments of the present application, a sealing ring 4 is arranged between the outer wall of the ocular lens barrel 3 and the inner wall of the whole machine adapter 1, the outer wall of the ocular lens barrel 3 is provided with an annular groove, and the sealing ring 4 is arranged in the annular groove. By extruding the sealing ring 4, the inside of the ocular lens and the external environment are isolated, water, dust and humid air are prevented from entering the lens, and a protection effect is achieved.

[0081] As shown in FIG. 4 and FIG. 5, in some embodiments of the present application, the limiting member 5 is a limiting pin, one end of the limiting pin is arranged in a pin hole of the outer wall of the ocular lens barrel 3, and the other end of the limiting pin is inserted into the annular groove 6 arranged in the inner wall of the diopter adjustment member 21 after passing through the limiting groove 2. By limiting and guiding the limiting pin through the limiting groove 2, the ocular lens barrel 3 moves synchronously along the axial direction in the whole machine adapter 1 along the limiting groove 2, so as to complete the adjustment of the diopter of the ocular lens. While being limited and guided by the limiting groove 2, the limiting pin also serves as a force arm to which the diopter adjustment member 21 applies a driving force to drive the ocular lens barrel 3 to move.

[0082] By using the limiting groove 2 and the limiting pin together, the movement fixed stroke of the ocular lens barrel 3 in the whole machine adapter 1 is realized, that is, the stroke of the diopter adjustment, and the stroke of the diopter adjustment is determined by the focal length f of the ocular lens group and the target diopter adjustment range. For example, the focal length f of the ocular lens is 27.37 mm, and the diopter adjustment range to be achieved is-5D~+4D. First, the focusing amount corresponding to one diopter is calculated:

[0083] X=f 2 / 1000=27.37 2 / 1000≈0.749mm;

[0084] That is, the ocular lens needs to move 0.749 mm in front focus to change one diopter;

[0085] So the range of 5D to +4D needs to change 9 diopters, the amount of movement of the eyepiece to the front focus is 6.741mm, that is, the length of the limiting groove 2 should be 6.741mm, of which 2.996mm at the upper end is the range of positive diopter adjustment, the positive diopter increases upwards; 3.745mm at the lower end is the range of negative diopter adjustment, the negative diopter increases downwards.

[0086] As shown in FIG. 4 and FIG. 5, in some embodiments of the present application, four limiting grooves 2 are provided on one side wall of the whole machine adapter 1, and the four limiting grooves 2 are arranged at intervals along the circumference of the whole machine adapter 1, and the limiting pin corresponds to the limiting groove 2 one by one. The specific number of limiting grooves 2 can be determined according to the actual needs of the product, which is not limited here.

[0087] As shown in FIG. 4 and FIG. 5, in some embodiments of the present application, the diopter adjustment part 21 includes a threaded adapter 7 and a diopter adjustment hand wheel 8, the diopter adjustment hand wheel 8 is sleeved on the threaded adapter 7 and is tightly connected with the threaded adapter 7, the inner wall of the diopter adjustment hand wheel 8 is provided with an annular limiting ring 9, and the gap between the annular limiting ring 9 and the threaded adapter 7 is used to form an annular groove 6, the inner wall of the threaded adapter 7 is provided with an internal thread, and the outer wall of the whole machine adapter 1 is provided with an external thread matched with the internal thread of the threaded adapter 7. At the limit adjustment position of the diopter adjustment part 21 (as shown in FIG. 4), the thread engagement number between the threaded adapter 7 and the whole machine adapter 1 is controlled to be more than 3, so as to prevent the damage of the thread caused by a larger impact. When designing the thread cooperation between the threaded adapter 7 and the whole machine adapter 1, the tightness of the thread cooperation is realized by precise tolerance control, and at the same time, an appropriate amount of lubricating grease is applied during installation to reduce the friction coefficient and improve the adjustment feel. The rotation angle of the diopter adjustment hand wheel 8 is set to about 360 degrees to ensure that the user can obtain a complete operation cycle when adjusting the diopter. Considering the thickness limit, the pitch of the internal thread of the threaded adapter 7 and the external thread of the whole machine adapter 1 is selected to be 1mm, and multi-start thread is adopted. The external thread of the threaded adapter 7 and the internal thread of the diopter adjustment hand wheel 8 are matched, the matching part is fixed by glue, and the two parts constitute the diopter adjustment part 21. Through the limitation and guidance of the limiting part 5 by the limiting groove 2, the diopter adjustment part 21 applies a moving driving force to the eyepiece barrel 3 through the limiting part 5, so that the eyepiece barrel 3 moves synchronously along the axis in the whole machine adapter 1 along the limiting groove 2, and the diopter adjustment of the eyepiece is completed. In addition, an installation control line is arranged, and the installation surface of the whole machine should be controlled to be below the installation control line 22, so as to ensure the stroke of the diopter adjustment hand wheel 8 when adjusting downwards to reach the designed maximum negative diopter (as shown in FIG. 4). The eyepiece can be installed on the whole machine through the whole machine adapter 1, and the whole machine can be a sighting scope or the like.

[0088] As shown in FIG. 4 and FIG. 5, in some embodiments of the present application, the outer wall of the diopter adjustment hand wheel 8 is provided with a knurled structure to improve the adjustment feel.

[0089] As shown in FIG. 4 and FIG. 5, in an embodiment, the eyepiece further comprises a silica gel eyecup 14 and an eyecup adapter 15 connecting the silica gel eyecup 14 to the eyepiece barrel 3, the eyecup adapter 15 is arranged at the end of the eyepiece barrel 3 away from the display screen 12, and a buckle structure is arranged between the eyecup adapter 15 and the silica gel eyecup 14 for mutual connection. Specifically, the annular buckle groove of the silica gel eyecup 14 is buckled with the annular buckle disc of the eyecup adapter 15, and the silica gel eyecup 14 is connected firmly and is not easy to fall off.

[0090] As shown in FIG. 4 and FIG. 5, in an embodiment, the second lens 20 and the third lens 10 are separated by the first spacer 16, and the first lens 19 and the second lens 20 are separated by the second spacer 17. The first spacer 16 and the second spacer 17 separate different lenses and maintain a predetermined relative position.

[0091] As shown in FIG. 4 and FIG. 5, in an embodiment, the inner wall of the eyecup adapter 15 is provided with an annular compression ring 18 for pressing the third lens 10 in the eyepiece barrel 3. Specifically, the eyecup adapter 15 is screwed with the eyepiece barrel 3, and the annular compression ring 18 is compressed to press the third lens 10 by twisting the eyecup adapter 15, and the eyecup adapter 15 can also serve as a compression ring.

[0092] In an embodiment, the bottom of the whole machine adapter 1 is provided with an adapter thread for mounting the eyepiece on the sighting device.

[0093] The eyepiece provided by the embodiment of the present application at least has the following technical effects:

[0094] During the rotation adjustment of the diopter adjustment member, the eyepiece barrel moves axially along the limiting groove, the eyepiece barrel is limited from rotating, the optical axis of the eyepiece does not rotate, and the imaging quality is stable.

[0095] Compared with the known mechanism comprising an axially arranged arm design, the occupation of the axial space of the eyepiece can be reduced, the light-shielding eyecup can be increased in the compact longitudinal space, and the gun sighting product can be compatible.

[0096] By extruding the O-shaped sealing ring, the inside and outside of the lens can be isolated from the environment, water, dust and humid air are prevented from entering the sighting scope, a protection effect is achieved, and during the diopter adjustment, the sealing ring is always in a compressed state between the eyepiece barrel and the whole machine adapter, and the sealing process is always effective.

[0097] When the threaded adapter is screwed with the threaded adapter of the whole machine, the tightness of the threaded connection is realized by precise tolerance control, and an appropriate amount of lubricating grease is applied during installation, and the operation feels smooth.

[0098] The eyepiece provided by the above embodiment is arranged in the whole machine adapter, the limiting groove is arranged on the side wall of the whole machine adapter, the limiting part is arranged on the outer wall of the eyepiece barrel, after the limiting part is inserted into the limiting groove, the limiting groove limits the rotation of the eyepiece barrel connected with the limiting part around the self-axis, the eyepiece barrel can move along the self-axis direction in the whole machine adapter, and the movement stroke of the limiting part is limited by the limiting groove, so that the movement stroke of the eyepiece barrel in the whole machine adapter is limited, that is, the limiting groove and the limiting part are used together to realize the adjustment of the diopter range of the eyepiece barrel in the whole machine adapter, the diopter adjustment part is arranged in the whole machine adapter, the diopter adjustment part is movably connected with the whole machine adapter, in the diopter adjustment process, the limiting groove and the limiting part arranged on the whole machine adapter and the eyepiece barrel are used together, and the limiting part is connected with the diopter adjustment part after penetrating the eyepiece barrel, so that the eyepiece barrel is limited not to rotate in the movement adjustment process of the diopter adjustment part, so that the optical axis of the eyepiece does not rotate, and the movement of the limiting part is driven by the movement of the diopter adjustment part to drive the eyepiece barrel to move synchronously along the axial direction of the whole machine adapter in the whole machine adapter, that is, the adjustment of the axial movement of the eyepiece can be completed. Compared with the known diopter adjustment mechanism, the occupation of the axial space of the eyepiece can be reduced, the axial size of the eyepiece can be simplified, and the demand for compact axial size of the eyepiece can be met.

[0099] The embodiment of the present application also provides an optical device, which comprises the eyepiece of the above embodiment, and the optical system in the eyepiece is the optical system in the above embodiment. The optical device can be a VR virtual reality device or an optical imaging device such as a sighting telescope. When the optical device is a sighting telescope, the optical device can further comprise an objective lens, and the eyepiece can be connected to the main body of the sighting telescope through the whole machine adapter 1.

[0100] It should be noted that, in this document, the terms "comprising", "containing", or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such a process, method, article or device. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article or device that includes the element.

[0101] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An optical system characterized by comprising: The display screen (12) and the second pancake composite film (11) are sequentially arranged along an optical axis, the display screen (12) is used for displaying image information, a half-transmission half-reflection film (191) and a first pancake composite film (13) are arranged between the display screen (12) and the second pancake composite film (11), the half-transmission half-reflection film (191) or the first pancake composite film (13) is arranged close to the display screen (12), and the first pancake composite film (13), the half-transmission half-reflection film (191) and the second pancake composite film (11) are used for folding and transmitting light emitted by the display screen (12) to a human eye.

2. The optical system of claim 1, wherein, At least two lenses are arranged in the direction of the optical axis of the display screen (12), the first pancake composite film (13) and / or the half-transmission half-reflection film (191) are arranged on the lens close to the display screen (12), and the second pancake composite film (11) is arranged on the lens away from the display screen (12).

3. The optical system of claim 2, wherein, The display screen (12), the first lens (19), the second lens (20) and the third lens (10) are sequentially arranged along an optical axis. The second pancake composite film (11) is arranged on the surface of the third lens (10) close to the second lens (20), the half-transmission half-reflection film (191) is arranged on the surface of the first lens (19) close to the display screen (12), and the first pancake composite film (13) is arranged on the surface of the display screen (12) close to the first lens (19), or on the first lens (19), or on the second lens (20).

4. The optical system of claim 3, wherein, The first lens (19) is a convex-concave lens, the radius of curvature of the surface of the first lens (19) close to the display screen (12) is 130-180 mm, the radius of curvature of the surface of the first lens (19) close to the second lens (20) is 10-60 mm, and the focal length of the first lens (19) is -10--100 mm. The second lens (20) is a double convex lens, the radius of curvature of the surface of the second lens (20) close to the first lens (19) is 80-140 mm, the radius of curvature of the surface of the second lens (20) close to the third lens (10) is 10-60 mm, and the focal length of the second lens (20) is 5-85 mm. The third lens (10) is a plano-convex lens, the radius of curvature of the surface of the third lens (10) close to the second lens (20) is infinite, the radius of curvature of the surface of the third lens (10) away from the second lens (20) is -140--200 mm, and the focal length of the third lens (10) is 125-215 mm.

5. The optical system of claim 2, wherein, The display screen (12), the first lens (19) and the second lens (20) are sequentially arranged along an optical axis. The surface of the second lens (20) close to the side of the first lens (19) is provided with a second pancake composite film (11); the surface of the first lens (19) close to the side of the display screen (12) is provided with a semi-transparent and semi-reflective film (191); and the first pancake composite film (13) is arranged on the surface of the display screen (12) close to the side of the first lens (19) or on the first lens (19).

6. The optical system of claim 5, wherein, The first lens (19) is a double-concave lens, the radius of curvature of the surface of the first lens (19) close to the side of the display screen (12) is -120 to -140 mm, the radius of curvature of the surface of the first lens (19) close to the side of the second lens (20) is 140 to 160 mm, and the focal length of the first lens (19) is -120 to -170 mm. The second lens (20) is a concave-convex lens, the radius of curvature of the surface of the second lens (20) close to the side of the first lens (19) is -20 to -40 mm, the radius of curvature of the surface of the second lens (20) away from the side of the first lens (19) is -20 to -40 mm, and the focal length of the second lens (20) is 20 to 90 mm.

7. The optical system of claim 2, wherein, The display screen (12), the first lens (19), the second lens (20), the third lens (10) and the fourth lens (24) are sequentially arranged along the optical axis. The surface of the fourth lens (24) close to the side of the third lens (10) is provided with a second pancake composite film (11); the surface of the second lens (20) close to the side of the display screen (12) is provided with a semi-transparent and semi-reflective film (191); and the first pancake composite film (13) is arranged on the surface of the display screen (12) close to the side of the first lens (19), or on the first lens (19), or on the second lens (20), or on the third lens (10).

8. The optical system of claim 7, wherein, The first lens (19) is a plano-convex lens, the radius of curvature of the surface of the first lens (19) close to the side of the display screen (12) is -200 mm to infinity, the radius of curvature of the surface of the first lens (19) close to the side of the second lens (20) is -90 to -110 mm, and the focal length of the first lens (19) is 80 to 150 mm. The second lens (20) is a convex-concave lens, the radius of curvature of the surface of the second lens (20) close to the side of the first lens (19) is 300 to 500 mm, the radius of curvature of the surface of the second lens (20) away from the side of the first lens (19) is 40 to 60 mm, and the focal length of the second lens (20) is -30 to -90 mm. The third lens (10) is a plano-convex lens, a radius of curvature of a surface of the third lens (10) close to the first lens (19) is -200mm to infinity, a radius of curvature of a surface of the third lens (10) away from the first lens (19) is -20mm to -40mm, and a focal length of the third lens (10) is 20mm to 80mm; The fourth lens (24) is a plano-convex lens, a radius of curvature of a surface of the fourth lens (24) close to the first lens (19) is 200mm to infinity, a radius of curvature of a surface of the fourth lens (24) away from the first lens (19) is -120mm to -140mm, and a focal length of the fourth lens (24) is 130mm to 220mm.

9. The optical system of claim 1, wherein, The first pancake composite film (13) comprises a first quarter-wave plate (131) and a first linear polarizer (132) arranged in sequence, and the first linear polarizer (132) is arranged on a side close to the display screen (12).

10. The optical system of claim 1, wherein, The second pancake composite film (11) comprises a second quarter-wave plate (111), a polarization reflection film (112) and a second linear polarizer (113) arranged in sequence, and the second linear polarizer (113) is arranged on a side away from the display screen (12).

11. The optical system of claim 1, wherein, An exit pupil distance of the optical system is 20mm to 70mm.

12. An eyepiece, characterized by The optical system comprises the optical system according to any one of claims 1 to 11.

13. The eyepiece of claim 12, wherein, The optical system further comprises an eyepiece barrel (3) and a power adjustment member (21), the optical system is arranged in the eyepiece barrel (3), and the power adjustment member (21) is used for power adjustment of the eyepiece.

14. The eyepiece of claim 13, wherein, The optical system further comprises a whole machine adapter (1), the whole machine adapter (1) comprises a ring-shaped side wall, and at least one limiting groove (2) is arranged on the side wall; The eyepiece barrel (3) is partially arranged in the whole machine adapter (1), a limiting member (5) corresponding to the limiting groove (2) is arranged on an outer wall of the eyepiece barrel (3), and the limiting member (5) is arranged in the corresponding limiting groove (2); The power adjustment member (21) is sleeved on the whole machine adapter (1), the power adjustment member (21) is movably connected with the whole machine adapter (1) and is connected with the limiting member (5) in linkage; The power adjustment member (21) is used for limiting and guiding the limiting member (5) through the limiting groove (2), the power adjustment member drives the limiting member (5) to further drive the eyepiece barrel (3) to move in the axial direction of the whole machine adapter (1) in the whole machine adapter (1) in linkage.

15. The eyepiece of claim 14, wherein, An inner wall of the power adjustment member (21) is provided with a ring-shaped groove (6) for accommodating the limiting member (5) passing through the limiting groove (2), and the power adjustment member (21) is used for rotating relative to the whole machine adapter (1) and driving the eyepiece barrel (3) to move in the axial direction of the whole machine adapter (1) through cooperation of the ring-shaped groove (6) and the limiting member (5). And / or, the limiting piece (5) is a limiting pin, one end of the limiting pin is fixedly connected with the outer wall of the ocular lens barrel (3), and the other end is inserted into the annular groove (6) after penetrating through the limiting groove (2).

16. The eyepiece of claim 15, wherein, The power adjusting member (21) comprises a threaded adapter (7) and a power adjusting hand wheel (8), the power adjusting hand wheel (8) is sleeved outside the threaded adapter (7) and is tightly connected with the threaded adapter (7); An annular limiting ring (9) is protruded on the inner wall of the power adjusting hand wheel (8), a gap between the annular limiting ring (9) and the threaded adapter (7) forms the annular groove (6), the inner wall of the threaded adapter (7) is provided with an internal thread, and the outer wall of the whole machine adapter (1) is provided with an external thread matched with the internal thread of the threaded adapter (7).

17. An optical device, characterized by The ocular lens comprises the ocular lens as claimed in any one of claims 11 to 16.

Images