Eyepiece optical system and display device capable of overlapping optical paths

Abstract

An eyepiece optical system capable of superimposing optical paths including an image surface (103), a sub-optical path (T), a beam splitter (101), and a main optical path (A) that are in contact with each other in sequence, wherein the optical axis of the image surface (103) and the optical axis of the sub-optical path (T) overlap, the optical axis of the main optical path (A) and the optical axis of the sub-optical path (T) are mutually perpendicular, the optical axis of the main optical path (A) is reflected by the beam splitter (101) and superimposed on the sub-optical path (T) that is transmitted by the beam splitter (101), and the main optical path (A) includes a first lens (111), a second lens (112), and a third lens group (116) that are sequentially arranged in the optical axis direction from the beam splitter (101) to a micro image display (102). an eyepiece optical system and a head mounted display device capable of superimposing optical paths including a first lens (111) which is a positive lens, a second lens (112) which is a negative lens, a third lens group (116) which is a positive lens group, a third lens group (116) which includes a third lens (113), a fourth lens (114) and a fifth lens (115) which are arranged in order in the optical axis direction from the beam splitter (101) to the micro image display (102), and a secondary optical path (T) which includes a sixth lens (109), a seventh lens (108) and an eighth lens (107) which are arranged in order in the optical axis direction from the image plane (103) to the beam splitter (101). By superimposing the image displayed on the micro image display (102) and the actual image captured by the object external observation imaging device, the imaging system is characterized by clearer imaging, less distortion, and higher imaging quality in accordance with the characteristic relationships between the optical components.

Description

Technical Field

[0001] The present invention relates to the field of optical technology, and more specifically, to an eyepiece optical system capable of superimposing optical paths and Bi table a display device.

Background Art

[0002] With the continuous improvement of science and technology, people are using some advanced optical instruments more and more frequently. However, many optical instruments on the current market have special requirements for users, and users can only get used to and use them after having the reserve of relevant knowledge by themselves, which greatly reduces the number of users.

[0003] For example, in the process of an amateur in the optical industry using optical imaging devices such as telescopes and night vision devices, the user is often unfamiliar with the observed object and cannot search for the information of the observed object without constantly using books or Internet-connected devices to query, and thus may not be able to search for the information of the corresponding object. In such a situation, the user has to spend a lot of time searching for materials during use, which greatly reduces the user's interest in using advanced devices.

[0004] With the increase in the number of people using advanced optical instruments, it is necessary to lower the entry barrier of advanced optical instruments. Without changing the original usage function of the optical instrument, the main challenge is how to make the user get used to the usage method.

Summary of the Invention

Problems to be Solved by the Invention

[0005] The technical problem to be solved by the present invention is that all existing optical systems are fixed-focus optical systems, which are difficult to meet the needs of most consumers, and the weight of the optical system is heavy and the volume is large. In view of the above defects of the prior art, an eyepiece optical system capable of superimposing optical paths and Bi table a display device are provided.

Means for Solving the Problem

[0006] The technical solution adopted by the present invention to solve its technical problem is to construct an eyepiece optical system capable of overlapping optical paths including an image plane, a sub-optical path, a beam splitter, and a main optical path that are sequentially in contact. The optical axis of the image plane and the optical axis of the sub-optical path overlap, the optical axis of the main optical path and the optical axis of the sub-optical path are perpendicular to each other, and the optical axis of the main optical path is reflected by the beam splitter and overlapped with the sub-optical path that is transmitted through the beam splitter. The main optical path includes a first lens, a second lens, and a third lens group that are sequentially arranged in the optical axis direction from the beam splitter to the micro-image display. The first lens is a positive lens, the second lens is a negative lens, the third lens group is a positive lens group, and the third lens group includes a third lens, a fourth lens, and a fifth lens that are sequentially arranged in the optical axis direction from the beam splitter to the micro-image display. The sub-optical path includes a sixth lens, a seventh lens, and an eighth lens that are sequentially arranged in the optical axis direction from the image plane to the beam splitter. Let the effective focal length of the optical system be F, the effective focal length of the main optical path be F 1 and the effective focal length of the sub-optical path be F 2 and F, F 1 , F 2 satisfy the following relational expressions (1), (2). 0.558 ≦ F 1 / F ≦ 1.822 (1); 2.265 ≦ F 2 / F ≦ 3.493 (2).

[0007] Furthermore, the effective focal length of the main optical path is F 1 and the effective focal length of the sub-optical path is F 2 and F 1 , F 2 satisfy the following relational expression (3). 1.413 ≦ F 2 / F 1 ≦ 4.63 (3).

[0008] Furthermore, let the image height of the image plane be H, the image height of the micro-image display be h, and H and h satisfy the following relational expression (4). 0.346 ≦ h / H ≦ 0.716 (4).

[0009] Furthermore, let the light reflectance of the beam splitter be μ, the transmittance of the beam splitter be n, and μ and n satisfy the following relational expression (5). 80% ≦ μ + n ≦ 100% (5).

[0010] Furthermore, let the angle formed by the optical axes of the main optical path and the sub-optical path be θ, and θ satisfies the following relational expression (6). θ < 180° (6).

[0011] Furthermore, the optical surface on the side where the first lens is away from the micro-image display is concave in the direction of the micro-image display, and the optical surface has a spherical surface shape.

[0012] Furthermore, the optical surface on the side where the second lens is close to the micro-image display is concave in the direction of the micro-image display, and the optical surface has a spherical surface shape.

[0013] Furthermore, the sixth lens is a negative lens, and the seventh lens and the eighth lens are positive lenses.

[0014] Furthermore, the optical surface on the side where the sixth lens is away from the image plane is joined to the adjacent optical surface of the seventh lens.

[0015] Furthermore, the calculation formula for the aspherical surface shape is as follows. JPEG0007689764000001.jpg1695

[0016] Furthermore, the third lens is a biconvex lens, and the optical surface on the side where the fourth lens is away from the micro-image display is in the direction of the micro-image display Convex surface de aFurther, the optical surface of the third lens on the side close to the micro image display is joined to the adjacent optical surface of the fourth lens.

[0017] Furthermore, both the optical surface of the third lens on the side close to the micro image display and the optical surface on the side away from the micro image display are recessed with respect to the micro image display Direction and the optical surface of the fourth lens on the side away from the micro image display is recessed in the direction of the micro image display.

[0018] Furthermore, the base materials of each lens in the beam splitter, the main optical path, and the sub-optical path are all optical glass materials.

[0019] The present invention includes a micro image display and an object external shape observation imaging device, and further includes the eyepiece optical system according to any one of the above items Reverse table and further provides the device shown.

[0020] Furthermore, the micro image display includes an organic electroluminescence light emitting element, a transmissive liquid crystal display, or a reflective liquid crystal display.

[0021] Furthermore, the object external shape observation imaging device includes, but is not limited to, a microscope or a telescope.

[0022] The beneficial effects of the present invention are as follows: The imaging light rays are superimposed in a semi-transmissive and semi-reflective manner. After the optical axis of the main optical path is reflected by the beam splitter, it is superimposed with the optical axis of the sub-optical path projected by the beam splitter, and the image displayed on the micro image display and the real object image captured by the object external shape observation imaging device are superimposed and displayed. By the combination of positive, negative, and positive lenses and the characteristic relationships between each optical component, an effect of high definition and high degree of coincidence is achieved, and the imaging is clearer, the distortion is small, and the imaging quality is high. The superposition of the imaging of the micro image display and the imaging of the double optical path is made more complete and realistic.

Brief Description of the Drawings

[0023] To more clearly explain the technical solutions in the embodiments of the present invention or the prior art, the following further describes the present invention in connection with the accompanying drawings and embodiments. The accompanying drawings in the following description are only a part of the embodiments of the present invention. For those skilled in the art, based on these accompanying drawings and without creative efforts, other accompanying drawings can also be obtained.

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[0024] In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in relation to them. It is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts all belong to the protection scope of the present invention.

[0025] The present invention constitutes an eyepiece optical system capable of overlapping optical paths including an image plane, a sub-optical path, a beam splitter, and a main optical path in sequence. The optical axis of the image plane and the optical axis of the sub-optical path overlap, and the optical axis of the main optical path and the optical axis of the sub-optical path are perpendicular to each other. The optical axis of the main optical path is reflected by the beam splitter and overlapped with the sub-optical path that is transmitted through the beam splitter.

[0026] The main optical path includes a first lens, a second lens, and a third lens group arranged in sequence in the optical axis direction from the beam splitter to the micro-image display. The first lens is a positive lens, the second lens is a negative lens, and the third lens group is a positive lens group. The third lens group includes a third lens, a fourth lens, and a fifth lens arranged in sequence in the optical axis direction from the beam splitter to the micro-image display.

[0027] The sub-optical path includes a sixth lens, a seventh lens, and an eighth lens arranged in sequence in the optical axis direction from the image plane to the beam splitter.

[0028] Let the effective focal length of the optical system be F, the effective focal length of the main optical path be F 1 and the effective focal length of the sub-optical path be F 2 and F, F1 , F 2 satisfies the following relational expressions (1) and (2). 0.558 ≤ F 1 / F ≤ 1.822 (1); 2.265 ≤ F 2 / F ≤ 3.493 (2).

[0029] Here, the possible values of F 1 / F are 0.558, 0.7, 0.81, 0.833, 0.954, 1.12, 1.32, 1.57, 1.822, etc., and the possible values of F 2 / F are 2.265, 2.34, 2.57, 2.67, 2.89, 3.11, 3.32, 3.493, etc.

[0030] The F 1 / F and F 2 / F value ranges are closely related to the correction of system aberration, the difficulty of optical element processing, and the sensitivity of optical element assembly deviation. The value of F 1 / F in relational expression (1) is greater than -0.558, can sufficiently correct system aberration, thereby realizing an excellent optical effect, and its value is less than 1.822, improving the processability of optical elements in the system. The F 2 / F value in relational expression (2) is greater than 2.265, improving the processability of optical elements in the system, and its value is less than 3.493, can sufficiently correct system aberration, thereby realizing an excellent optical effect.

[0031] The above embodiments adopt the semi-transmissive and semi-reflective characteristics of the beam splitter. Here, after the optical axis of the main optical path is reflected by the beam splitter, it is superimposed on the optical axis of the sub-optical path projected by the beam splitter, and the image displayed on the micro-image display and the real object image captured by the object external shape observation imaging device are superimposed and displayed. Through the combination of positive, negative, and positive lenses and the characteristic relationships between each optical component, the effects of high definition and high degree of coincidence are achieved, and the imaging is clearer, the distortion is smaller, and the imaging quality is high. The superposition of the imaging of the micro-image display and the imaging of the double optical path is made more complete and realistic.

[0032] In a further embodiment, the effective focal length of the main optical path is F 1 and the effective focal length of the sub-optical path is F 2 and F 1 、F 2 satisfy the following relational expression (3). 1.413 ≦ F 2 / F 1 ≦ 4.63 (3).

[0033] Here, the possible values of F 2 / F 1 are 1.413, 1.512, 1.784, 1.95, 2.111, 2.135, 3.12, 3.354, 3.785, 3.987, 4.12, 4.63, etc.

[0034] In a further embodiment, taking the image height of the image plane as H, the image height of the micro-image display as h, and H, h satisfy the following relational expression (4). 0.346 ≦ h / H ≦ 0.716 (4).

[0035] Here, the possible values of h / H are 0.346, 0.461, 0.478, 0.557, 0.578, 0.613, 0.655, 0.689, 0.716, etc.

[0036] In a further embodiment, taking the light reflectivity of the beam splitter as μ and the transmittance of the beam splitter as n, and μ, n satisfy the following relational expression (5). 80% ≤ μ + n ≤ 100% (5).

[0037] Here, the possible values of μ + n are 80%, 85%, 88.5%, 89.1%, 91.2%, 99%, 100%, etc.

[0038] In a further embodiment, the angle formed by the optical axes of the main optical path and the sub - optical path is θ, and θ satisfies the following relational expression (6). θ < 180° (6).

[0039] In a further embodiment, the optical surface of the first lens on the side away from the micro - image display is concave in the direction of the micro - image display, and the optical surface has a spherical surface shape.

[0040] In a further embodiment, the optical surface of the second lens on the side close to the micro - image display is concave in the direction of the micro - image display, and the optical surface has a spherical surface shape.

[0041] Furthermore, it is advantageous for improving aberrations such as the spherical aberration and field curvature of the system, and enabling the eyepiece lens system to achieve a high - resolution optical effect with uniform image quality over the full size.

[0042] In a further embodiment, the sixth lens is a negative lens, and the seventh and eighth lenses are positive lenses.

[0043] In a further embodiment, the optical surface of the sixth lens on the side away from the image plane is joined to the adjacent optical surface of the seventh lens.

[0044] In a further embodiment, the third lens is a biconvex lens, and the optical surface of the fourth lens on the side away from the micro - image display is Convex surface in a the direction of the micro - image display, and the optical surface of the third lens on the side close to the micro - image display is joined to the adjacent optical surface of the fourth lens.

[0045] In a further embodiment, the optical surfaces on the side of the third lens close to the micro-image display and the optical surfaces on the side away from the micro-image display are both recessed with respect to the micro-image display Direction and the optical surface of the fourth lens on the side away from the micro-image display is recessed in the direction of the micro-image display.

[0046] In a further embodiment, the base materials of the beam splitter and each lens in the main optical path and the sub-optical path are all optical glass materials.

[0047] Each order of aberration of the eyepiece lens optical system can be sufficiently corrected, and the manufacturing cost of the optical elements and the weight of the optical system can be suppressed.

[0048] In a further embodiment, the calculation formula for the aspherical surface shape is as follows: JPEG0007689764000002.jpg1695Here, z is the sag of the optical surface, c is the curvature at the vertex of the aspherical surface, k is the aspherical coefficient, α2, 4, 6… are the coefficients of each order, and r is the distance coordinate from a point on the surface to the optical axis of the lens system.

[0049] The aberrations of the optical system (including spherical aberration, coma aberration, distortion, field curvature, astigmatism, chromatic aberration and other higher-order aberrations) are sufficiently corrected, the eyepiece lens optical system realizes a large field angle and a large aperture, and at the same time, the image quality of the central field of view and the edge field of view is further improved, the difference in image quality between the central field of view and the edge field of view is reduced, which is advantageous for realizing more uniform image quality and low distortion.

[0050] Hereinafter, with more specific embodiments, the principle, solution and display results of the above eyepiece lens optical system will be described in more detail.

[0051] In the following embodiments, as shown in FIG. 1, it includes a sequentially adjacent image plane 103, a sub-optical path T, a beam splitter 101, and a main optical path A. The optical axis of the image plane 103 coincides with the optical axis of the sub-optical path T, and the optical axis of the main optical path A is perpendicular to the optical axis of the sub-optical path T. The optical axis of the main optical path A is reflected by the beam splitter 101 and overlapped with the sub-optical path T that is transmitted through the beam splitter 101. The main optical path A includes a first lens 111, a second lens 112, a third lens 113, a fourth lens 114, and a fifth lens 115 that are sequentially arranged in the optical axis direction from the beam splitter 101 to the micro-image display 102. The first lens 111 is a positive lens, and the second lens 112 is a negative lens. The sub-optical path T includes a 6 th lens 109, a 7 th lens 108, and a 8 th lens 107, which are sequentially arranged in the optical axis direction from the image plane 103 to the beam splitter 101. The image plane 103 may be an exit pupil formed by an eyepiece optical system, a virtual light-emitting aperture, and an optimal imaging effect can be observed. The light emitted from the micro-image display 102 is reflected by the beam splitter 101 after passing through the fifth lens 115, the fourth lens 114, the third lens 113, the second lens 112, and the first lens 111 in sequence. The light rays emitted from the object outline observation imaging device 110 are transmitted through the beam splitter 101 and overlapped with the light rays of the micro-image display 102 reflected by the beam splitter 101, and sequentially pass through the 8 th lens 107, the 7 th lens 108, and the 6 th lens 109, and then reach the image plane 103.

[0052] First Embodiment The design data of the eyepiece lens of the first embodiment is as shown in Table 1 below.

[0053]

Table 1

[0054] The attached drawing 1 is a 2D structural diagram of the eyepiece optical system of the first embodiment, including an image plane 103 in sequence contact, a sub-optical path T, a beam splitter 101, and a main optical path A. The optical axis of the image plane 103 and the optical axis of the sub-optical path T overlap, the optical axis of the main optical path A and the optical axis of the sub-optical path T are perpendicular to each other, and the optical axis of the main optical path A is reflected by the beam splitter 101 and overlapped with the sub-optical path T transmitted through the beam splitter 101. The main optical path A includes a first lens 111, a second lens 112, a third lens 113, a fourth lens 114, and a fifth lens 115 arranged in sequence in the optical axis direction from the beam splitter 101 to the micro image display 102. The first lens 111 is a positive lens, the second lens 112 is a negative lens, and the sub-optical path T includes a 6 th lens 109, a 7 th lens 108, and a 8 th lens 107 arranged in sequence in the optical axis direction from the image plane 103 to the beam splitter 101. Let the angle formed by the optical axes of the main optical path A and the sub-optical path T be θ, and the θ angle is less than 180°. The optical surface on the side where the first lens 111 is away from the micro image display 102 is concave in the direction of the micro image display 102, and the optical surface has an even-order aspherical surface shape. The optical surface on the side where the second lens 112 is close to the micro image display 102 is concave towards the Direction micro image display 102, and the optical surface has a spherical surface shape. The substrates of the optical lenses and the beam splitter 101 of this optical system are made of optical glass material. Here, the focal length F of the optical system is 79.47 mm, the focal length F 1 of the main optical path A is 100.62 mm, the focal length F 2 of the sub-optical path T is 180 mm, the image height H of the image plane 103 is 23 mm, and the image height of the micro image display 102 is 8 mm. Then, F 1 / F is 1.267, F 2 / F is 2.265, F 2 / F 1 is 1.789, and h / H is 0.348.

[0055] Attached drawings 2a, attached drawing 2b, attached drawing 3, and attached drawing 4 are respectively the field curvature diagram, distortion graph, speckle array diagram, and optical transfer function MTF diagram of the optical system. Each field ray of this embodiment has high resolution and small distortion of field curvature within a unit pixel of the image plane (display device I), the resolution per unit period of 10 mm reaches 0.8 or more, the aberrations of the optical system are well corrected, and it reflects that a uniform and high-optical-performance display image can be observed by the eyepiece lens optical system.

[0056] Second Embodiment The design data of the eyepiece lens of the second embodiment is as shown in Table 2 below.

[0057]

Table 2

[0058] Attached drawing 5 is a 2D structure diagram of the eyepiece lens optical system of the second embodiment, including the sequentially adjacent image plane 103, sub-optical path T, beam splitter 101, and main optical path A. The optical axis of the image plane 103 coincides with the optical axis of the sub-optical path T, the optical axis of the main optical path A is perpendicular to the optical axis of the sub-optical path T, the optical axis of the main optical path A is reflected by the beam splitter 101 and overlapped with the sub-optical path T transmitted through the beam splitter 101. The main optical path A includes the first lens 111, the second lens 112, the third lens 113, the fourth lens 114, and the fifth lens 115 arranged in sequence in the optical axis direction from the beam splitter 101 to the micro image display 102. The first lens 111 is a positive lens, the second lens 112 is a negative lens, and the sub-optical path T includes the 6 th lens 109, the 7 th lens 108, and the 8It includes the lens 107, the angle formed by the optical axes of the main optical path A and the sub-optical path T is θ, and the θ angle is smaller than 180°. The optical surface of the first lens 111 on the side away from the micro-image display 102 is concave in the direction of the micro-image display 102, and the optical surface has an even-order aspherical surface shape. The optical surface of the second lens 112 on the side close to the micro-image display 102 is concave in the direction of the micro-image display 102, and the optical surface has a spherical surface shape. The optical lens of this optical system and the substrate of the beam splitter 101 are made of optical glass material. Here, the focal length F of the optical system is 77.48 mm, and the focal length F 1 of the main optical path A is 100.22 mm, and the focal length F 2 of the sub-optical path T is 180 mm. When the image height H of the image plane 103 is 16.2 mm and the image height of the micro-image display 102 is 6 mm, F 1 / F is 1.29, F 2 / F is 2.32, F 2 / F 1 is 1.80, and h / H is 0.37.

[0059] Attached drawings 6a, attached drawing 6b, attached drawing 7, and attached drawing 8 are respectively the field curvature diagram, distortion graph, speckle array diagram, and optical transfer function MTF diagram of the optical system. Each field ray of this embodiment has high resolution and small distortion of optical field curvature within the unit pixel of the image plane (display device I), the resolution per unit period of 20 mm reaches 0.9 or more, the aberration of the optical system is corrected well, and it reflects that a uniform and high-optical-performance display image can be observed by the eyepiece lens optical system.

[0060] The third embodiment The design data of the eyepiece lens of the third embodiment is as shown in Table 3 below.

[0061]

Table 3

[0062] Attached drawing 9 is a 2D structural diagram of the eyepiece optical system of the third embodiment, including an image plane 103 in sequence contact, a sub-optical path T, a beam splitter 101, and a main optical path A. The optical axis of the image plane 103 coincides with the optical axis of the sub-optical path T, and the optical axis of the main optical path A is perpendicular to the optical axis of the sub-optical path T. The optical axis of the main optical path A is reflected by the beam splitter 101 and overlapped with the sub-optical path T that is transmitted through the beam splitter 101. The main optical path A includes a first lens 111, a second lens 112, a third lens 113, a fourth lens 114, and a fifth lens 115 arranged in sequence in the optical axis direction from the beam splitter 101 to the micro image display 102. The first lens 111 is a positive lens, and the second lens 112 is a negative lens. The sub-optical path T includes a 6 lens 109, a 7 lens 108, and a 8 lens 107 arranged in sequence in the optical axis direction from the image plane 103 to the beam splitter 101. Let the angle formed by the optical axes of the main optical path A and the sub-optical path T be θ. The θ angle is less than 180°. The optical surface on the side where the first lens 111 is away from the micro image display is recessed towards the micro image display 102 Direction , and the optical surface has an aspherical surface shape of even order. The optical surface on the side where the second lens 112 is close to the micro image display 102 is recessed towards the micro image display 102 Direction , and the optical surface has a spherical surface shape. The substrates of the optical lenses and the beam splitter 101 of this optical system are made of optical glass material. Here, the focal length F of the optical system is 65.17 mm, the focal length F 1 of the main optical path A is 107.96 mm, the focal length F 2 of the sub-optical path T is 180 mm, the image height H of the image plane 103 is 23.5 mm, and the image height of the micro image display 102 is 16.2 mm. When F 1 / F is 1.65, F 2 / F is 2.76, F 2 / F 1 is 1.67, and h / H is 0.69.

[0063] Attached drawings 10a, Attached drawing 10b, Attached drawing 11, and Attached drawing 12 are respectively the field curvature diagram, distortion graph, speckle array diagram, and optical transfer function MTF diagram of the optical system. Each field ray of this embodiment has high resolution and small distortion of field curvature within a unit pixel of the image plane (display device I), the resolution per unit period of 20 mm reaches 0.9 or more, the aberrations of the optical system are well corrected, and it reflects that a uniform and high-optical-performance display image can be observed by the eyepiece optical system.

[0064] Each data of the above Examples 1 to 3 all satisfy the parameter requirements recorded in the summary of the invention, and the results are as shown in Table 4 below.

[0065]

Table 4

[0066] The present invention includes a micro-image display and an object contour observation imaging device, and further includes the eyepiece optical system of any one of the above. Reverse table The present invention further provides the device shown.

[0067] Preferably, the micro-image display includes an organic electroluminescence light-emitting element, a transmissive liquid crystal display, or a reflective liquid crystal display.

[0068] Preferably, the object contour observation imaging device includes, but is not limited to, a microscope or a telescope.

[0069] Above Record tableThe display device adopts an eyepiece optical system capable of overlapping optical paths. This system overlaps imaging light rays in a semi-transmissive and semi-reflective manner. After the optical axis of the main optical path is reflected by the beam splitter, it is overlapped with the optical axis of the sub-optical path projected by the beam splitter, and the image displayed on the micro-image display and the real object image captured by the object outline observation imaging device are overlapped and displayed. By the combination of positive, negative, and positive lenses and the characteristic relationships between each optical component, the effects of high definition and high consistency are achieved, and it has the characteristics of clearer imaging, less distortion, and high imaging quality, making the superposition of the imaging of the micro-image display and the imaging of the double optical path more complete and realistic.

[0070] In specific actual applications, the user overlaps and displays multiple images, performs explanatory analysis processing on the imaging of the optical instrument, and enables even those who are not proficient in the optical instrument to make operation judgments.

[0071] Those skilled in the art should understand that based on the above description, improvements or conversions can be made, and all these improvements and conversions should fall within the protection scope of the claims attached to the present invention.

Claims

1. An eyepiece optical system capable of superimposing optical paths including an image plane, a sub-optical path, a beam splitter, and a main optical path that are sequentially connected. The optical axis of the image plane and the optical axis of the sub-optical path overlap, the optical axis of the main optical path and the optical axis of the sub-optical path are perpendicular to each other, and the optical axis of the main optical path is reflected by the beam splitter and superimposed with the sub-optical path that is transmitted through the beam splitter. The main optical path includes a first lens, a second lens, and a third lens group that are sequentially arranged in the optical axis direction from the beam splitter to the micro image display. The first lens is a positive lens, the second lens is a negative lens, the third lens group is a positive lens group, and the third lens group includes a third lens, a fourth lens, and a fifth lens that are sequentially arranged in the optical axis direction from the beam splitter to the micro image display. The sub-optical path includes a sixth lens, a seventh lens, and an eighth lens that are sequentially arranged in the optical axis direction from the image plane to the beam splitter. Let the effective focal length of the optical system be F, the effective focal length of the main optical path be F1, and the effective focal length of the sub-optical path be F2. And F, F1, F2 satisfy the following relational expressions (1), (2). 0.558 ≤ F1 / F ≤ 1.822 (1) 2.265 ≤ F2 / F ≤ 3.493 (2) An eyepiece optical system capable of superimposing optical paths, characterized by satisfying the above.

2. The effective focal length of the main optical path is F1, the effective focal length of the sub-optical path is F2, and F1, F2 satisfy the following relational expression (3). 1.413 ≤ F2 / F1 ≤ 4.63 (3) The eyepiece optical system capable of superimposing optical paths according to Claim 1, characterized by satisfying the above.

3. Let the image height of the image plane be H, the image height of the micro image display be h, and H, h satisfy the following relational expression (4). 0.346 ≤ h / H ≤ 0.716 (4) The eyepiece optical system capable of superimposing optical paths according to Claim 1, characterized by satisfying the above.

4. Let the light reflectance of the beam splitter be μ, the transmittance of the beam splitter be n, and μ, n satisfy the following relational expression (5). 80% ≤ μ + n ≤ 100% (5) The eyepiece optical system capable of superimposing optical paths according to Claim 1, characterized by satisfying the above.

5. Let the angle formed by the optical axes of the main optical path and the sub-optical path be θ, and θ satisfies the following relational expression (6) θ < 180° (6) The eyepiece optical system capable of superposing the optical paths according to claim 1, characterized in that it satisfies the above conditions.

6. Among the optical surfaces of the first lens, the optical surface on the side away from the micro-image display has a concave surface with respect to the micro-image display, and the optical surface has an even-order aspherical surface shape. The eyepiece optical system capable of superposing the optical paths according to claim 1, characterized in that it has the above characteristics.

7. Among the optical surfaces of the second lens, the optical surface on the side close to the micro-image display has a concave surface with respect to the micro-image display, and the optical surface has a spherical surface shape. The eyepiece optical system capable of superposing the optical paths according to claim 1, characterized in that it has the above characteristics.

8. The sixth lens is a negative lens, and the seventh lens and the eighth lens are positive lenses. The eyepiece optical system capable of superposing the optical paths according to claim 1, characterized in that it has the above characteristics.

9. Among the optical surfaces of the sixth lens, the optical surface on the side away from the image plane is joined to the adjacent optical surface among the optical surfaces of the seventh lens. The eyepiece optical system capable of superposing the optical paths according to claim 1, characterized in that it has the above characteristics.

10. The third lens is a biconvex lens. Among the optical surfaces of the fourth lens, the optical surface on the side away from the micro-image display has a convex surface with respect to the micro-image display. Among the optical surfaces of the third lens, the optical surface on the side close to the micro-image display is joined to the adjacent optical surface among the optical surfaces of the fourth lens. The eyepiece optical system capable of superposing the optical paths according to claim 1, characterized in that it has the above characteristics.

11. Among the optical surfaces of the third lens, both the optical surface on the side close to the micro-image display and the optical surface on the side away from the micro-image display have a concave surface with respect to the micro-image display. Among the optical surfaces of the fourth lens, the optical surface on the side away from the micro-image display has a concave surface with respect to the micro-image display. The eyepiece optical system capable of superposing the optical paths according to claim 1, characterized in that it has the above characteristics.

12. The base material of each lens in the beam splitter, the main optical path, and the sub-optical path is all an optical glass material, and the eyepiece optical system capable of superposing the optical paths according to claim 1 is characterized in that.

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