Optical lens group and head-mounted electronic device

Abstract

An optical lens assembly, from the eye side to the image source side, sequentially comprises: a first group, including a first lens group and optical elements, the optical elements including an absorptive polarizing element, a reflective polarizing element, and a first phase retardation element from the eye side to the image source side; a second group, from the eye side to the image source side, sequentially comprising: a second lens group with positive refractive power and a partially reflective and partially transmissive element; and a third group, from the eye side to the image source side, sequentially comprising a second phase retardation element and an image source surface. When the optical lens assembly meets certain conditions, it can reduce the weight of the device, provide zoom functionality, and ensure image quality.

Description

Technical Field

[0001] This invention relates to an optical lens assembly and a head-mounted electronic device, and more particularly to an optical lens assembly applicable to a head-mounted electronic device. Background Technology

[0002] With the development of the semiconductor industry, the functions of various consumer electronics products have become increasingly powerful. Coupled with the emergence of various software applications and services, consumers have more choices. When the market was no longer satisfied with handheld electronic products, head-mounted displays emerged. However, current head-mounted displays are relatively heavy and have poor image quality.

[0003] Furthermore, existing head-mounted displays are all fixed-focus designs, so users with myopia or hyperopia need to wear their existing glasses. This affects wearing comfort and the performance of the head-mounted display. Summary of the Invention

[0004] Therefore, the object of the present invention is to provide an optical lens group and a head-mounted electronic device that can reduce the weight of the device by folding the optical path, provide zoom function, allow users to use the device of the present invention without wearing additional glasses, and ensure image quality.

[0005] To achieve the above objectives, an embodiment of the present invention provides an optical lens group comprising three groups, which sequentially include from the eye side to the image source side: a first group comprising: a first lens group comprising one, two, or three lenses, wherein the eye-side surface of the lens closest to the eye side in the first lens group is convex near the optical axis; and optical elements comprising, sequentially from the eye side to the image source side, an absorptive polarizing element, a reflective polarizing element, and a first phase retardation element; a second group comprising, sequentially from the eye side to the image source side: a second lens group having positive refractive power, comprising one, two, or three lenses, wherein the image source-side surface of the lens closest to the image source side in the second lens group is convex near the optical axis; and a partially reflective and partially transmissive element; and a third group comprising, sequentially from the eye side to the image source side, a second phase retardation element and an image source surface.

[0006] The overall focal length of the first lens group is f_G1, the overall focal length of the second lens group is f_G2, the overall focal length of the optical lens group at near point is EFL_N, and the overall focal length of the optical lens group at far point is EFL_F. The distance on the optical axis from the eye-side surface of the lens closest to the eye in the first lens group to the image source surface is TL. The maximum image source height of the optical lens group is IMH, and the following conditions are satisfied: -0.48 < f_G2 / f_G1 < 2.15 and 0.51 < EFL_N*TL / (EFL_F*IMH) < 1.56. Satisfying f_G2 / f_G1 allows for a more appropriate distribution of refractive power in the optical lens group and reduces aberrations. Satisfying EFL_N*TL / (EFL_F*IMH) allows for a proper balance between the miniaturization of the optical lens group and the size of the display's light-emitting area within the zoom range.

[0007] Alternatively, the total number of refractive lenses in the optical lens group can be 2, 3, or 4.

[0008] The distance from the image source side surface of the lens closest to the image source side in the first lens group to the image source surface on the optical axis is MS2. The overall focal length of the optical lens group at the far point is EFL_F, and it satisfies the following condition: 0.27 < MS2 / EFL_F < 0.92. Therefore, the lengths of each element in the optical lens group can be reasonably allocated, and the sensitivity to assembly tolerances can be reduced.

[0009] At the far point, the distance on the optical axis between the image-source side surface of the lens closest to the image source side in the first lens group and the eye-side surface of the lens closest to the eye side in the second lens group is T12_F. At the near point, the distance on the optical axis between the image-source side surface of the lens closest to the image source side in the first lens group and the eye-side surface of the lens closest to the eye side in the second lens group is T12_N. The overall focal length of the optical lens group at the near point is EFL_N, satisfying the condition: 0.06 < (T12_F – T12_N) / EFL_N < 0.50. This ensures an optimal balance between performance and miniaturization of the optical lens group within the zoom range.

[0010] The distance on the optical axis from the eye-side surface of the lens closest to the eye side to the image-source-side surface of the lens closest to the image-source side in the first lens group is GCT1, and the distance on the optical axis from the image-source-side surface of the lens closest to the image-source side to the image-source surface is MS2, satisfying the condition: 0.11 < GCT1 / MS2 < 1.19. This helps to achieve a proper balance between the lens shaping properties and refractive power of the first lens group.

[0011] The overall focal length of the second lens group is f_G2. At near point, the distance on the optical axis from the eye-side surface of the lens closest to the eye in the second lens group to the image source surface is MS3_N. At far point, the distance on the optical axis from the eye-side surface of the lens closest to the eye in the second lens group to the image source surface is MS3_F, and the following condition is satisfied: 0.38mm -1 <f_G2∕(MS3_N*MS3_F)<3.06mm -1 This ensures an optimal balance between lens shapeability and miniaturization within the zoom range.

[0012] At the far point, the distance from the eye-side surface of the lens closest to the eye in the second lens group to the image source surface on the optical axis is MS3_F, and the overall focal length of the first lens group is f_G1, satisfying the condition: -0.04 < MS3_F / f_G1 < 0.10. This helps to achieve a proper balance between the lens shaping properties and refractive power of the first lens group.

[0013] At near point, the distance on the optical axis from the eye-side surface of the lens closest to the eye in the second lens group to the image source surface is MS3_N, and the distance on the optical axis from the eye-side surface of the lens closest to the eye in the second lens group to the image source-side surface of the lens closest to the image source in the second lens group is GCT2, satisfying the condition: 0.78 < MS3_N / GCT2 < 3.98. This helps to improve the focusing range of the optical lens group.

[0014] The radius of curvature of the eye-side surface of the lens closest to the eye in the first lens group is R1. The overall focal length of the optical lens group at near point is EFL_N, and the overall focal length of the optical lens group at far point is EFL_F, satisfying the following condition: 0.06mm -1 <R1∕(EFL_N*EFL_F)<1.48mm -1 This effectively reduces distortion of the optical lens group during focusing.

[0015] The overall focal length of this optical lens group at the far point is EFL_F. The radius of curvature of the eye-side surface of the lens closest to the eye in the first lens group is R1, satisfying the condition: 0.02 < EFL_F / R1 < 0.45. This effectively improves the distortion of the optical lens group, reduces aberrations, and decreases the lens size.

[0016] The distance from the eye-side surface of the lens closest to the eye in the first lens group to the image source surface on the optical axis is TL. The overall focal length of the optical lens group at near point is EFL_N, and it satisfies the following condition: 0.43 < TL / EFL_N < 1.35. Thus, suitable lens shaping and appropriate length of the optical lens group can be maintained.

[0017] The distance on the optical axis between the eye-side surface of the lens closest to the eye in the first lens group and the image-source-side surface of the lens closest to the image source in the first lens group is GCT1. The distance on the optical axis between the eye-side surface of the lens closest to the eye in the second lens group and the image-source-side surface of the lens closest to the image source in the second lens group is GCT2, and the following condition must be met: 0.45 < GCT2 / GCT1 < 4.64. Therefore, while ensuring image quality, the lens thickness can be guaranteed to meet the processing requirements of lens manufacturing.

[0018] The radius of curvature of the eye-side surface of the lens closest to the eye in the second lens group is R3, and the radius of curvature of the image-source-side surface of the lens closest to the image source in the second lens group is R4, satisfying the condition: -0.83 < R4 / R3 < 0.54. By constraining the two radii of curvature, excessively small radii of curvature can be prevented and sensitivity to assembly tolerances can be reduced.

[0019] The distance from the image source side surface of the lens closest to the image source side in the first lens group to the image source surface on the optical axis is MS2. The overall focal length of the second lens group is f_G2, and the following condition is satisfied: 0.04 < MS2 / f_G2 < 0.18. This helps to achieve a proper balance between the spatial size of the two lens groups and the refractive power of the second lens group.

[0020] The maximum viewing angle of this optical lens group at the far point is FOV_F. The distance along the optical axis from the image-source side surface of the lens closest to the image source side in the first lens group to the eye-side surface of the lens closest to the eye side in the second lens group at the far point is T12_F. The maximum image source height of this optical lens group is IMH, and it satisfies the following condition: 0.18 < FOV_F / (T12_F * IMH) < 3.18. Therefore, while satisfying the requirement of a large field of view for the human eye to achieve a good sense of immersion, it also meets the need for lightweight design.

[0021] Alternatively, the first group can remain stationary during zooming.

[0022] Alternatively, the optical element is located on the image source side surface of the lens that is closest to the eye side in the first lens group.

[0023] Alternatively, the third group can remain stationary during zooming.

[0024] Alternatively, the second group can be moved from the source side to the target side when zooming from near to far.

[0025] Alternatively, the overall focal length of the first lens group is f_G1, and satisfies the following condition: -560.00mm < f_G1 < 8141.41mm.

[0026] Alternatively, the overall focal length of the second lens group is f_G2, and the following condition is met: 56.78mm < f_G2 < 432.03mm.

[0027] Alternatively, at near point, the distance on the optical axis from the eye-side surface of the lens closest to the eye in the second lens group to the image source surface is MS3_N, and satisfies the following condition: 6.43mm < MS3_N < 27.92mm.

[0028] Optionally, at the far point, the distance from the eye-side surface of the lens closest to the eye in the second lens group to the image source surface on the optical axis is MS3_F, and satisfies the following condition: 4.80mm < MS3_F < 19.95mm.

[0029] Optionally, the distance from the eye-side surface of the lens closest to the eye in the first lens group to the image source surface on the optical axis is TL, and satisfies the following condition: 9.70mm < TL < 38.18mm.

[0030] Alternatively, the maximum image source height of the optical lens group is IMH, and the following conditions must be met: 8.08mm < IMH < 37.72mm.

[0031] A head-mounted electronic device includes: a housing; an optical lens group disposed within the housing; an image source disposed within the housing and positioned on the image source surface of the optical lens group; and a controller disposed within the housing and electrically connected to the image source. The optical lens group comprises three groups, which, from the eye side to the image source side, sequentially include: a first group comprising: a first lens group comprising one, two, or three lenses, wherein the eye-side surface of the lens closest to the eye in the first lens group is convex near the optical axis; and optical elements, from the eye side to the image source side, sequentially including an absorptive polarizing element, a reflective polarizing element, and a first phase retardation element; a second group, from the eye side to the image source side, sequentially including: a second lens group having positive refractive power, comprising one, two, or three lenses, wherein the image source-side surface of the lens closest to the image source in the second lens group is convex near the optical axis; and a partially reflective and partially transmissive element; and a third group, from the eye side to the image source side, sequentially including a second phase retardation element and an image source surface.

[0032] The overall focal length of the first lens group is f_G1, the overall focal length of the second lens group is f_G2, the overall focal length of the optical lens group at near point is EFL_N, and the overall focal length of the optical lens group at far point is EFL_F. The distance on the optical axis from the eye-side surface of the lens closest to the eye in the first lens group to the image source surface is TL. The maximum image source height of the optical lens group is IMH, and the following conditions are satisfied: -0.48 < f_G2 / f_G1 < 2.15 and 0.51 < EFL_N*TL / (EFL_F*IMH) < 1.56. Satisfying f_G2 / f_G1 allows for a more appropriate distribution of refractive power in the optical lens group and reduces aberrations. Satisfying EFL_N*TL / (EFL_F*IMH) allows for a proper balance between miniaturization and the size of the display's light-emitting area within the zoom range.

[0033] Alternatively, the total number of refractive lenses in the optical lens group can be 2, 3, or 4.

[0034] The distance from the image source side surface of the lens closest to the image source side in the first lens group to the image source surface on the optical axis is MS2. The overall focal length of the optical lens group at the far point is EFL_F, and it satisfies the following condition: 0.27 < MS2 / EFL_F < 0.92. Therefore, the lengths of each element in the optical lens group can be reasonably allocated, and the sensitivity to assembly tolerances can be reduced.

[0035] At the far point, the distance on the optical axis between the image-source side surface of the lens closest to the image source side in the first lens group and the eye-side surface of the lens closest to the eye side in the second lens group is T12_F. At the near point, the distance on the optical axis between the image-source side surface of the lens closest to the image source side in the first lens group and the eye-side surface of the lens closest to the eye side in the second lens group is T12_N. The overall focal length of the optical lens group at the near point is EFL_N, satisfying the condition: 0.06 < (T12_F – T12_N) / EFL_N < 0.50. This ensures an optimal balance between performance and miniaturization of the optical lens group within the zoom range.

[0036] The distance on the optical axis from the eye-side surface of the lens closest to the eye side to the image-source-side surface of the lens closest to the image-source side in the first lens group is GCT1, and the distance on the optical axis from the image-source-side surface of the lens closest to the image-source side to the image-source surface is MS2, satisfying the condition: 0.11 < GCT1 / MS2 < 1.19. This helps to achieve a proper balance between lens shaping and refractive power in the first lens group.

[0037] The overall focal length of the second lens group is f_G2. At near point, the distance on the optical axis from the eye-side surface of the lens closest to the eye in the second lens group to the image source surface is MS3_N. At far point, the distance on the optical axis from the eye-side surface of the lens closest to the eye in the second lens group to the image source surface is MS3_F, and the following condition is satisfied: 0.38mm -1 <f_G2∕(MS3_N*MS3_F)<3.06mm -1 This ensures an optimal balance between lens shapeability and miniaturization within the zoom range.

[0038] At the far point, the distance from the eye-side surface of the lens closest to the eye in the second lens group to the image source surface on the optical axis is MS3_F, and the overall focal length of the first lens group is f_G1, satisfying the condition: -0.04 < MS3_F / f_G1 < 0.10. This helps to achieve a proper balance between lens shaping and refractive power in the first lens group.

[0039] At near point, the distance on the optical axis from the eye-side surface of the lens closest to the eye in the second lens group to the image source surface is MS3_N, and the distance on the optical axis from the eye-side surface of the lens closest to the eye in the second lens group to the image source-side surface of the lens closest to the image source in the second lens group is GCT2, satisfying the condition: 0.78 < MS3_N / GCT2 < 3.98. This helps to improve the focusing range of the optical lens group.

[0040] The radius of curvature of the eye-side surface of the lens closest to the eye in the first lens group is R1. The overall focal length of the optical lens group at near point is EFL_N, and the overall focal length of the optical lens group at far point is EFL_F, satisfying the following condition: 0.06mm -1 <R1∕(EFL_N*EFL_F)<1.48mm -1 This effectively reduces distortion of the optical lens group during focusing.

[0041] The overall focal length of this optical lens group at the far point is EFL_F. The radius of curvature of the eye-side surface of the lens closest to the eye in the first lens group is R1, satisfying the condition: 0.02 < EFL_F / R1 < 0.45. This effectively improves the distortion of the optical lens group, reduces aberrations, and decreases the lens size.

[0042] The distance from the eye-side surface of the lens closest to the eye in the first lens group to the image source surface on the optical axis is TL. The overall focal length of the optical lens group at near point is EFL_N, and it satisfies the following condition: 0.43 < TL / EFL_N < 1.35. Thus, suitable lens shaping and appropriate length of the optical lens group can be maintained.

[0043] The distance on the optical axis between the eye-side surface of the lens closest to the eye in the first lens group and the image-source-side surface of the lens closest to the image source in the first lens group is GCT1. The distance on the optical axis between the eye-side surface of the lens closest to the eye in the second lens group and the image-source-side surface of the lens closest to the image source in the second lens group is GCT2, and the following condition must be met: 0.45 < GCT2 / GCT1 < 4.64. Therefore, while ensuring image quality, the lens thickness can be guaranteed to meet the processing requirements of lens manufacturing.

[0044] The radius of curvature of the eye-side surface of the lens closest to the eye in the second lens group is R3, and the radius of curvature of the image-source-side surface of the lens closest to the image source in the second lens group is R4, satisfying the condition: -0.83 < R4 / R3 < 0.54. By constraining the two radii of curvature, excessively small radii of curvature can be prevented and sensitivity to assembly tolerances can be reduced.

[0045] The distance from the image source side surface of the lens closest to the image source side in the first lens group to the image source surface on the optical axis is MS2. The overall focal length of the second lens group is f_G2, and the following condition is satisfied: 0.04 < MS2 / f_G2 < 0.18. This helps to achieve a proper balance between the spatial size of the two lens groups and the refractive power of the second lens group.

[0046] The maximum viewing angle of this optical lens group at the far point is FOV_F. The distance along the optical axis from the image-source side surface of the lens closest to the image source side in the first lens group to the eye-side surface of the lens closest to the eye side in the second lens group at the far point is T12_F. The maximum image source height of this optical lens group is IMH, and it satisfies the following condition: 0.18 < FOV_F / (T12_F * IMH) < 3.18. Therefore, while satisfying the requirement of a large field of view for the human eye to achieve a good sense of immersion, it also meets the need for lightweight design.

[0047] Alternatively, the first group can remain stationary during zooming.

[0048] Alternatively, the optical element is located on the image source side surface of the lens that is closest to the eye side in the first lens group.

[0049] Alternatively, the third group can remain stationary during zooming.

[0050] Alternatively, the second group can be moved from the source side to the target side when zooming from near to far.

[0051] Alternatively, the overall focal length of the first lens group is f_G1, and satisfies the following condition: -560.00mm < f_G1 < 8141.41mm.

[0052] Alternatively, the overall focal length of the second lens group is f_G2, and the following condition is met: 56.78mm < f_G2 < 432.03mm.

[0053] Alternatively, at near point, the distance on the optical axis from the eye-side surface of the lens closest to the eye in the second lens group to the image source surface is MS3_N, and satisfies the following condition: 6.43mm < MS3_N < 27.92mm.

[0054] Optionally, at the far point, the distance from the eye-side surface of the lens closest to the eye in the second lens group to the image source surface on the optical axis is MS3_F, and satisfies the following condition: 4.80mm < MS3_F < 19.95mm.

[0055] Optionally, the distance from the eye-side surface of the lens closest to the eye in the first lens group to the image source surface on the optical axis is TL, and satisfies the following condition: 9.70mm < TL < 38.18mm.

[0056] Alternatively, the maximum image source height of the optical lens group is IMH, and the following conditions must be met: 8.08mm < IMH < 37.72mm. Attached Figure Description

[0057] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0058] Figure 1A This is a schematic diagram of the optical lens group of the first embodiment of the present invention at the near point;

[0059] Figure 1B This is a schematic diagram of the optical lens group of the first embodiment of the present invention at the far point;

[0060] Figure 1C yes Figure 1A A magnified view of a portion of the image;

[0061] Figure 1D This is a schematic diagram of the parameters and optical path of the optical lens group according to the first embodiment of the present invention;

[0062] Figure 2A This is a schematic diagram of the optical lens group of the second embodiment of the present invention at the near point;

[0063] Figure 2B This is a schematic diagram of the optical lens group of the second embodiment of the present invention at the far point;

[0064] Figure 3A This is a schematic diagram of the optical lens group of the third embodiment of the present invention at the near point;

[0065] Figure 3B This is a schematic diagram of the optical lens group of the third embodiment of the present invention at the far point;

[0066] Figure 4A This is a schematic diagram of the optical lens group of the fourth embodiment of the present invention at the near point;

[0067] Figure 4B This is a schematic diagram of the optical lens group of the fourth embodiment of the present invention at the far point;

[0068] Figure 5A This is a schematic diagram of the optical lens group of the fifth embodiment of the present invention at the near point;

[0069] Figure 5B This is a schematic diagram of the optical lens group of the fifth embodiment of the present invention at the far point;

[0070] Figure 6A This is a schematic diagram of the optical lens group of the sixth embodiment of the present invention at the near point;

[0071] Figure 6B This is a schematic diagram of the optical lens group of the sixth embodiment of the present invention at the far point;

[0072] Figure 7A This is a schematic diagram of the optical lens group of the seventh embodiment of the present invention at the near point;

[0073] Figure 7B This is a schematic diagram of the optical lens group of the seventh embodiment of the present invention at the far point;

[0074] Figure 8A This is a schematic diagram of the optical lens group of the eighth embodiment of the present invention at the near point;

[0075] Figure 8B This is a schematic diagram of the optical lens group of the eighth embodiment of the present invention at the far point; and

[0076] Figure 9 This is a schematic diagram of a head-mounted electronic device according to an embodiment of the present invention.

[0077] Symbol Explanation

[0078] 100, 200, 300, 400, 500, 600, 700, 800: Aperture

[0079] 110, 210, 310, 410, 510, 610, 710, 810: First lens

[0080] 111,211,311,411,511,611,711,811: Eye side surface

[0081] 112,212,312,412,512,612,712,812: Image source side surface

[0082] 120, 220, 320, 420, 520, 620, 720, 820: Optical components

[0083] 121: Absorption polarizing element

[0084] 122: Reflective polarizing element

[0085] 123: First phase delay element

[0086] 130, 230, 330, 430, 530, 630, 730, 830: Second lens

[0087] 131,231,331,431,531,631,731,831: Eye side surface

[0088] 132,232,332,432,532,632,732,832: Image source side surface

[0089] 440, 540, 640, 740, 840: Third lens

[0090] 441, 541, 641, 741, 841: Eye side surface

[0091] 442, 542, 642, 742, 842: Image source side surface

[0092] 650, 750, 850: Fourth lens

[0093] 651, 751, 851: Eye side surface

[0094] 652, 752, 852: Image source side surface

[0095] 170, 270, 370, 470, 570, 670, 770, 870: Partially reflective and partially transmissive elements

[0096] 180, 280, 380, 480, 580, 680, 780, 880: Second phase delay element

[0097] 191,291,391,491,591,691,791,891: Image source surface

[0098] 193,293,393,493,593,693,793,893: Image source

[0099] 195,295,395,495,595,695,795,895: Optical axis

[0100] 9: Head-mounted electronic devices

[0101] 910: Outer shell

[0102] 920: Optomechanical Module

[0103] 930: Image Source

[0104] 940: Controller

[0105] T12_N: The distance on the optical axis between the image-side surface of the lens closest to the image source side in the first lens group and the eye-side surface of the lens closest to the eye side in the second lens group at near point.

[0106] T12_F: The distance on the optical axis between the image-side surface of the lens closest to the image source side in the first lens group and the eye-side surface of the lens closest to the eye side in the second lens group at the far point.

[0107] MS2: The distance on the optical axis from the image source side surface of the lens closest to the image source side in the first lens group.

[0108] MS3_N: The distance on the optical axis from the eye-side surface of the lens closest to the eye in the second lens group at near point.

[0109] MS3_F: The distance on the optical axis from the eye-side surface of the lens closest to the eye in the second lens group when the optical lens group is at the far point.

[0110] IMH: Maximum image height of the optical lens group

[0111] TL: The distance along the optical axis from the eye-side surface of the lens closest to the eye in the first lens group to the image source surface.

[0112] L1: Optical path

[0113] P1: First Group

[0114] P2: Second Group

[0115] P3: Third Group

[0116] G1: First lens group

[0117] G2: Second lens group Detailed Implementation

[0118] The technical solutions of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0119] First Embodiment

[0120] Please refer to Figures 1A to 1D The optical lens group shown, wherein Figure 1A This is a schematic diagram of the optical lens group of the first embodiment of the present invention at the near point. Figure 1B This is a schematic diagram of the optical lens group of the first embodiment of the present invention at the far point. Figure 1C yes Figure 1A A magnified view of a portion of the image. Figure 1D This is a schematic diagram of the parameters and optical path of the optical lens group according to the first embodiment of the present invention. This optical lens group includes, sequentially from the eye side to the image source side along the optical axis 195, a first group P1, a second group P2, and a third group P3. During focusing (or zooming), the second group P2 can be displaced relative to the first group P1 along the optical axis 195 between the first group P1 and the third group P3.

[0121] The first group P1 includes an aperture 100, a first lens group G1 (i.e., the first lens 110), and an optical element 120. The aperture 100 is positioned where the user's eye views the image. The first lens 110 is located between the aperture 100 and the optical element 120. The second group P2, from the eye side to the image source side, sequentially includes a second lens group G2 (i.e., the second lens 130) with positive refractive power and a partially reflective and partially transmissive element 170. The third group P3, from the eye side to the image source side, sequentially includes a second phase retardation element 180 and an image source surface 191. The total number of refractive lenses in the optical lens group is two, but not limited to this. The optical lens group can be used with an image source 193, and the image source surface 191 can be located on the image source 193. The image source 193 can be a liquid crystal display, an OLED display, or an LED display, but is not limited to these.

[0122] The first lens 110 has positive refractive power, its eye-side surface 111 is convex near the optical axis, and its image-source-side surface 112 is planar near the optical axis. The eye-side surface 111 is aspherical.

[0123] The optical element 120, from the eye side to the image source side, sequentially includes an absorptive polarizing element 121, a reflective polarizing element 122, and a first phase retardation element 123. These three elements are stacked (e.g., but not limited to, coated) on the image source side surface 112, and both opposite surfaces of these elements are planar. Specifically, the absorptive polarizing element 121 is attached to the image source side surface 112, the reflective polarizing element 122 is attached to the absorptive polarizing element 121, and the first phase retardation element 123 is attached to the reflective polarizing element 122. The first phase retardation element 123 is, for example, but not limited to, a quarter-wave plate.

[0124] The second lens 130 has positive refractive power, with its eye-side surface 131 being convex near the optical axis and its image-source-side surface 132 being convex near the optical axis. Both the eye-side surface 131 and the image-source-side surface 132 are aspherical.

[0125] A partially reflective and partially transmissive element 170 is disposed (e.g., but not limited to, coated) on the image source side surface 132 and has an average light reflectance of at least 30%, preferably 50%, in the visible light range. Here, the average light reflectance refers to the average value of the reflectance of the partially reflective and partially transmissive element 170 for light of different wavelengths.

[0126] The second phase delay element 180 is disposed between the partially reflective and partially transmissive element 170 and the image source surface 191, and is close to the image source surface 191. The second phase delay element 180 is, for example, but not limited to, a quarter-wave plate.

[0127] The equations for the aspherical surfaces of the above lenses are expressed as follows:

[0128]

[0129] Where z is the position value along the optical axis 195 at a height of h with the surface vertex as a reference; c is the curvature of the lens surface near the optical axis, and is the reciprocal of the radius of curvature (R) (c=1 / R), where R is the radius of curvature of the lens surface near the optical axis; h is the vertical distance of the lens surface from the optical axis 195; k is the conic constant; and Ai is the i-th order aspherical coefficient.

[0130] The overall focal length of the optical lens group at near point is EFL_N, and the overall focal length of the optical lens group at far point is EFL_F. The overall focal length of the first lens group G1 is f_G1, and the overall focal length of the second lens group G2 is f_G2. At near point, the distance on the optical axis 195 between the image source-side surface of the lens closest to the image source side in the first lens group (i.e., the image source-side surface 112 of the first lens 110) and the eye-side surface of the lens closest to the eye side in the second lens group (i.e., the eye-side surface 131 of the second lens 130) is T12_N. At far point, the distance on the optical axis 195 between the image source-side surface of the lens closest to the image source side in the first lens group (i.e., the image source-side surface 112 of the first lens 110) and the eye-side surface of the lens closest to the eye side in the second lens group is T12_N. The distance on the optical axis 195 between the eye-side surface (i.e., the eye-side surface 131 of the second lens 130) and the optical axis 195 is T12_F. The maximum viewing angle of the optical lens group at the near point is FOV_N, and the maximum viewing angle of the optical lens group at the far point is FOV_F. The distance on the optical axis 195 between the eye-side surface of the lens closest to the eye side in the first lens group G1 (i.e., the eye-side surface 111 of the first lens 110) and the image-source-side surface of the lens closest to the image source side in the first lens group G1 (i.e., the image-source-side surface 112 of the first lens 110) is GCT1. The distance on the optical axis 195 between the eye-side surface of the lens closest to the eye side in the second lens group G2 (i.e., the eye-side surface 131 of the second lens 130) and the image-source-side surface of the lens closest to the image source side in the second lens group G2 (i.e., the second lens 130) is GCT1. The distance from the image source side surface 132 of lens 130 to the optical axis 195 is GCT2. At the near point, the distance from the eye-side surface of the lens closest to the eye side in the second lens group G2 (i.e., the eye-side surface 131 of second lens 130) to the image source surface 191 on the optical axis 195 is MS3_N. At the far point, the distance from the eye-side surface of the lens closest to the eye side in the second lens group G2 (i.e., the eye-side surface 131 of second lens 130) to the image source surface 191 on the optical axis 195 is MS3_F. The distance from the image source side surface of the lens closest to the image source side in the first lens group G1 (i.e., the image source side surface 112 of first lens 110) to the image source surface 191 on the optical axis 195 is MS2. The radius of curvature of the eye-side surface of the lens closest to the eye (i.e., the eye-side surface 111 of the first lens 110) is R1; the radius of curvature of the image-source-side surface of the lens closest to the image source side in the first lens group G1 (i.e., the image-source-side surface 112 of the first lens 110) is R2; the radius of curvature of the eye-side surface of the lens closest to the eye side in the second lens group G2 (i.e., the eye-side surface 131 of the second lens 130) is R3; the radius of curvature of the image-source-side surface of the lens closest to the image source side in the second lens group G2 (i.e., the image-source-side surface 132 of the second lens 130) is R4; and the distance from the eye-side surface of the lens closest to the eye side in the first lens group G1 (i.e., the eye-side surface 111 of the first lens 110) to the image source surface 191 on the optical axis 195 is TL.The maximum image source height of the optical lens group is IMH (typically the radius of the inscribed circle of the image source plane 191), and the values ​​of these parameters are shown in Table 1 below.

[0131]

[0132] From Table 1, it can be deduced that the optical lens group satisfies the conditions in Table 2 below:

[0133]

[0134] In the optical lens group of the first embodiment, the overall focal length of the first lens group G1 is f_G1, the overall focal length of the second lens group G2 is f_G2, and the following condition is satisfied: f_G2 / f_G1=0.08.

[0135] In the optical lens group of the first embodiment, the overall focal length of the optical lens group at the near point is EFL_N, the overall focal length of the optical lens group at the far point is EFL_F, the distance from the eye-side surface of the lens closest to the eye side in the first lens group G1 to the image source surface 191 on the optical axis 195 is TL, the maximum image source height of the optical lens group is IMH, and the following condition is satisfied: EFL_N*TL / (EFL_F*IMH)=0.85.

[0136] In the optical lens group of the first embodiment, the distance from the image source side surface of the lens closest to the image source side to the image source surface 191 on the optical axis 195 is MS2, and the overall focal length of the optical lens group at the far point is EFL_F, and satisfies the following condition: MS2 / EFL_F=0.59.

[0137] In the optical lens group of the first embodiment, at the far point, the distance on the optical axis 195 from the image source side surface of the lens closest to the image source side in the first lens group to the eye side surface of the lens closest to the eye side in the second lens group is T12_F. At the near point, the distance on the optical axis 195 from the image source side surface of the lens closest to the image source side in the first lens group to the eye side surface of the lens closest to the eye side in the second lens group is T12_N. The overall focal length of the optical lens group at the near point is EFL_N, and satisfies the following condition: (T12_F–T12_N) / EFL_N=0.35.

[0138] In the optical lens group of the first embodiment, the distance from the eye-side surface of the lens closest to the eye side in the first lens group G1 to the image-source-side surface of the lens closest to the image source side in the first lens group G1 on the optical axis 195 is GCT1, and the distance from the image-source-side surface of the lens closest to the image source side in the first lens group G1 to the image source surface 191 on the optical axis 195 is MS2, and the following condition is satisfied: GCT1 / MS2=0.21.

[0139] In the optical lens group of the first embodiment, the overall focal length of the second lens group G2 is f_G2. At the near point, the distance from the eye-side surface of the lens closest to the eye in the second lens group G2 to the image source surface 191 on the optical axis 195 is MS3_N. At the far point, the distance from the eye-side surface of the lens closest to the eye in the second lens group G2 to the image source surface 191 on the optical axis 195 is MS3_F, and the following condition is satisfied: f_G2 / (MS3_N*MS3_F)=1.00mm -1 .

[0140] In the optical lens group of the first embodiment, at the far point, the distance from the eye-side surface of the lens closest to the eye side in the second lens group G2 to the image source surface 191 on the optical axis 195 is MS3_F, the overall focal length of the first lens group G1 is f_G1, and the following condition is satisfied: MS3_F / f_G1=0.004.

[0141] In the optical lens group of the first embodiment, at the near point, the distance from the eye-side surface of the lens closest to the eye side in the second lens group G2 to the image source surface 191 on the optical axis 195 is MS3_N, and the distance from the eye-side surface of the lens closest to the eye side in the second lens group G2 to the image source surface of the lens closest to the image source side in the second lens group G2 on the optical axis 195 is GCT2, and the following condition is satisfied: MS3_N / GCT2=2.84.

[0142] In the optical lens group of the first embodiment, the radius of curvature of the eye-side surface of the lens closest to the eye in the first lens group G1 is R1, the overall focal length of the optical lens group at near point is EFL_N, and the overall focal length of the optical lens group at far point is EFL_F, satisfying the following condition: R1 / (EFL_N*EFL_F)=1.06mm -1 .

[0143] In the optical lens group of the first embodiment, the overall focal length of the optical lens group at the far point is EFL_F, and the radius of curvature of the eye-side surface of the lens closest to the eye side in the first lens group G1 is R1, and satisfies the following condition: EFL_F / R1=0.03.

[0144] In the optical lens group of the first embodiment, the distance from the eye-side surface of the lens closest to the eye side to the image source surface 191 on the optical axis 195 is TL, and the overall focal length of the optical lens group at the near point is EFL_N, and satisfies the following condition: TL / EFL_N=0.82.

[0145] In the optical lens group of the first embodiment, the distance on the optical axis 195 from the eye-side surface of the lens closest to the eye side in the first lens group G1 to the image-source-side surface of the lens closest to the image source side in the first lens group G1 is GCT1, and the distance on the optical axis 195 from the eye-side surface of the lens closest to the eye side in the second lens group G2 to the image-source-side surface of the lens closest to the image source side in the second lens group G2 is GCT2, and the following condition is satisfied: GCT2 / GCT1=1.57.

[0146] In the optical lens group of the first embodiment, the radius of curvature of the eye-side surface of the lens closest to the eye side in the second lens group G2 is R3, and the radius of curvature of the image-source side surface of the lens closest to the image source side in the second lens group G2 is R4, and the following condition is satisfied: R4 / R3=-0.27.

[0147] In the optical lens group of the first embodiment, the distance from the image source side surface of the lens closest to the image source side in the first lens group G1 to the image source surface 191 on the optical axis 195 is MS2, and the overall focal length of the second lens group G2 is f_G2, and satisfies the following condition: MS2 / f_G2=0.12.

[0148] In the optical lens group of the first embodiment, the maximum viewing angle of the optical lens group at the far point is FOV_F, the distance on the optical axis 195 from the image source side surface of the lens closest to the image source side in the first lens group to the eye side surface of the lens closest to the eye side in the second lens group at the far point is T12_F, the maximum image source height of the optical lens group is IMH, and the following condition is satisfied: FOV_F / (T12_F*IMH)=0.29.

[0149] Furthermore, the optical lens group of the first embodiment, through a combination of absorptive polarizing elements, reflective polarizing elements, phase retardation elements, and lenses, utilizes the transmission and reflection of light to fold the optical path without affecting image quality, thereby compressing the length of the lens group required for imaging. Please refer to... Figure 1DAs shown, linearly polarized incident light emitted from image source 193 travels along optical path L1 to the user's eye. Specifically, when this linearly polarized incident light passes through the second phase retardation element 180, it changes from a linearly polarized state to a circularly polarized state. The circularly polarized incident light is then split by the partially reflected partial transmission element 170 located on the image source side surface of the lens closest to the image source side in the second lens group G2. This causes a portion of the incident light to pass through the partially reflected partial transmission element 170 and the second lens group G2 as transmitted light, entering the first group P1. When the transmitted light traveling to the first group P1 passes through the first phase retardation element 123, it changes from a circularly polarized state to a linearly polarized state, having a polarization direction parallel to the reflection axis of the reflective polarizing element 122. Then, this linearly polarized transmitted light is reflected by the reflective polarizing element 122 to pass through the first phase retardation element 180. The phase retardation element 123 causes the light to return from a linearly polarized state to a circularly polarized state. Then, after passing through the second lens group G2 of the second group P2, a portion of the transmitted light that has returned to a circularly polarized state is reflected as reflected light by the partially reflective and partially transmitted light element 170, so as to pass through the second lens group G2 and proceed in parallel to the first group P1. When the reflected light that has traveled to the first group P1 passes through the first phase retardation element 123, it will change from a circularly polarized state to a linearly polarized state and have a polarization direction perpendicular to the reflection axis of the reflective polarizing element 122. Finally, the linearly polarized reflected light, after passing through the reflective polarizing element 122 and the absorptive polarizing element 121, will be refracted to the user's eye by the lens in the first lens group G1 that is closer to the eye side than the absorptive polarizing element 121.

[0150] Please also refer to Tables 3 and 4 below.

[0151]

[0152] Table 3 shows the detailed structural data of the first embodiment. The units for radius of curvature, thickness, gap, and focal length are mm. Surfaces 18-0 represent the surfaces through which light passes sequentially from image source surface 191 to aperture 100. Surface 0 is the gap between the user's eye (or aperture 100) and the image on the optical axis 195, and the image position is further away from the eye side than image source surface 191. Surface 1 is the gap between aperture 100 and the first lens 110 on the optical axis 195. Surfaces 2, 3, and 17 are the thicknesses of the first lens 110, the absorptive polarizing element 121, and the second phase retardation element 180 on the optical axis 195, respectively. Surfaces 4, 11, and 12 are the thicknesses of the reflective polarizing element 122 on the optical axis 195. Surface 5 is the thickness of the first phase delay element 123 on the optical axis 195; surface 6 is the gap between the first phase delay element 123 and the second lens 130 on the optical axis 195; surfaces 7 and 15 are the thickness of the second lens 130 on the optical axis 195; surfaces 8 and 16 are the thickness of the partially reflective and partially transmissive element 170 on the optical axis 195; surface 9 is the gap between the partially reflective and partially transmissive element 170 and the first phase delay element 123 on the optical axis 195; surface 14 is the gap between the first phase delay element 123 and the second lens 130 on the optical axis 195; the negative values ​​of the parameters in the table indicate light reflection and propagation.

[0153] Table 4 shows the aspherical data in the first embodiment, where: k is the conic coefficient in the aspherical curve equation, and A4, A6, A8, A10, A12, A14, A16, A18 and A20 are higher-order aspherical coefficients.

[0154] Furthermore, the tables in the following embodiments are schematic diagrams corresponding to each embodiment. The definitions of the data in the tables are the same as those in Tables 1 to 4 of the first embodiment, and will not be repeated here. In addition, in each embodiment, the maximum effective radius of any surface of the lens is usually the point where the incident light rays at the maximum angle of view of the optical lens group pass through the outermost edge of the entrance pupil and intersect at the lens surface, the perpendicular distance between the intersection point and the optical axis, or the radius of the part of the lens surface that does not have surface treatment (the lens surface has a concave-convex structure, or is coated with ink, etc.), or the radius of the part of the lens through which light can pass (a light shield, or a spacer ring, etc. can block light from passing through the lens), but is not limited to these.

[0155] Second Embodiment

[0156] Please refer to Figures 2A to 2B The optical lens group shown, wherein Figure 2A This is a schematic diagram of the optical lens group of the second embodiment of the present invention at the near point. Figure 2BThis is a schematic diagram of the optical lens group of the second embodiment of the present invention at the far point. This optical lens group includes a first group P1, a second group P2, and a third group P3 sequentially along the optical axis 295 from the eye side to the image source side. During focusing (or zooming), the second group P2 can be displaced relative to the first group P1 along the optical axis 295 between the first group P1 and the third group P3.

[0157] The first group P1 includes an aperture 200, a first lens group G1 (i.e., the first lens 210), and an optical element 220. The aperture 200 is positioned where the user's eye views the image. The first lens 210 is located between the aperture 200 and the optical element 220. The second group P2, from the eye side to the image source side, sequentially includes a second lens group G2 (i.e., the second lens 230) with positive refractive power and a partially reflective and partially transmissive element 270. The third group P3, from the eye side to the image source side, sequentially includes a second phase retardation element 280 and an image source surface 291. The total number of refractive lenses in the optical lens group is two, but not limited to this. The optical lens group can be used with an image source 293, and the image source surface 291 can be located on the image source 293. The image source 293 can be a liquid crystal display, an OLED display, or an LED display, but is not limited to these.

[0158] The first lens 210 has positive refractive power, its eye-side surface 211 is convex near the optical axis, and its image-source-side surface 212 is planar near the optical axis. The eye-side surface 211 is aspherical.

[0159] The optical element 220 includes an absorptive polarizing element, a reflective polarizing element, and a first phase retardation element in sequence from the eye side to the image source side. The configuration of these three elements can be referred to the configuration of the absorptive polarizing element 121, the reflective polarizing element 122, and the first phase retardation element 123 in the first embodiment, and will not be described again here.

[0160] The second lens 230 has positive refractive power. Its eye-side surface 231 is concave near the optical axis, and its image-source-side surface 232 is convex near the optical axis. The eye-side surface 231 is spherical, and the image-source-side surface 232 is aspherical.

[0161] A partially reflective and partially transmissive element 270 is disposed (e.g., but not limited to, coated) on the image source side surface 232 and has an average light reflectance of at least 30%, preferably 50%, in the visible light range. Here, the average light reflectance refers to the average value of the reflectance of the partially reflective and partially transmissive element 270 for light of different wavelengths.

[0162] The second phase delay element 280 is disposed between the partially reflective and partially transmissive element 270 and the image source surface 291, and is close to the image source surface 291. The second phase delay element 280 is, for example, but not limited to, a quarter-wave plate.

[0163] Please also refer to Tables 5 to 8 below.

[0164]

[0165]

[0166]

[0167]

[0168] In the second embodiment, the curve equation of the aspherical surface is the same as that of the aspherical surface in the first embodiment. The values ​​of each parameter in Table 7 can be derived from Tables 5 and 6, and the values ​​of each condition in Table 8 can be derived from Table 7.

[0169] Third Embodiment

[0170] Please refer to Figures 3A to 3B The optical lens group shown, wherein Figure 3A This is a schematic diagram of the optical lens group of the third embodiment of the present invention at the near point. Figure 3B This is a schematic diagram of the optical lens group of the third embodiment of the present invention at the far point. This optical lens group includes a first group P1, a second group P2, and a third group P3 sequentially along the optical axis 395 from the eye side to the image source side. During focusing (or zooming), the second group P2 can be displaced relative to the first group P1 along the optical axis 395 between the first group P1 and the third group P3.

[0171] The first group P1 includes an aperture 300, a first lens group G1 (i.e., the first lens 310), and an optical element 320. The aperture 300 is positioned where the user's eye views the image. The first lens 310 is located between the aperture 300 and the optical element 320. The second group P2, from the eye side to the image source side, sequentially includes a second lens group G2 (i.e., the second lens 330) with positive refractive power and a partially reflective and partially transmissive element 370. The third group P3, from the eye side to the image source side, sequentially includes a second phase retardation element 380 and an image source surface 391. The total number of refractive lenses in the optical lens group is two, but not limited to this. The optical lens group can be used with an image source 393, and the image source surface 391 can be located on the image source 393. The image source 393 can be a liquid crystal display, an OLED display, or an LED display, but is not limited to these.

[0172] The first lens 310 has positive refractive power, its eye-side surface 311 is convex near the optical axis, and its image-source-side surface 312 is planar near the optical axis. The eye-side surface 311 is aspherical.

[0173] The optical element 320 includes an absorptive polarizing element, a reflective polarizing element, and a first phase delay element in sequence from the eye side to the image source side. The configuration of these three elements can be referred to the configuration of the absorptive polarizing element 121, the reflective polarizing element 122, and the first phase delay element 123 in the first embodiment, and will not be described again here.

[0174] The second lens 330 has positive refractive power. Its eye-side surface 331 is convex near the optical axis, and its image-source-side surface 332 is convex near the optical axis. Both the eye-side surface 331 and the image-source-side surface 332 are aspherical.

[0175] A partially reflective and partially transmissive element 370 is disposed (e.g., but not limited to, coated) on the image source side surface 332 and has an average light reflectance of at least 30%, preferably 50%, in the visible light range. Here, the average light reflectance refers to the average value of the reflectance of the partially reflective and partially transmissive element 370 for light of different wavelengths.

[0176] The second phase delay element 380 is disposed between the partially reflective and partially transmissive element 370 and the image source surface 391, and is close to the image source surface 391. The second phase delay element 380 is, for example, but not limited to, a quarter-wave plate.

[0177] Please also refer to Tables 9 to 12 below.

[0178]

[0179]

[0180]

[0181]

[0182] In the third embodiment, the curve equation of the aspherical surface is the same as that of the aspherical surface in the first embodiment. The values ​​of each parameter in Table 11 can be derived from Tables 9 and 10, and the values ​​of each condition in Table 12 can be derived from Table 11.

[0183] Fourth embodiment

[0184] Please refer to Figures 4A to 4B The optical lens group shown, wherein Figure 4A This is a schematic diagram of the optical lens group of the fourth embodiment of the present invention at the near point. Figure 4BThis is a schematic diagram of the optical lens group of the fourth embodiment of the present invention at the far point. This optical lens group includes a first group P1, a second group P2, and a third group P3 sequentially along the optical axis 495 from the eye side to the image source side. During focusing (or zooming), the second group P2 can be displaced relative to the first group P1 along the optical axis 495 between the first group P1 and the third group P3.

[0185] The first group P1 includes an aperture 400, a first lens group G1 (i.e., the first lens 410), and an optical element 420. The aperture 400 is positioned where the user's eye views the image. The first lens 410 is located between the aperture 400 and the optical element 420. The second group P2, from the eye side to the image source side, sequentially includes a second lens group G2 with positive refractive power and a partially reflective and partially transmissive element 470. The second lens group G2, from the eye side to the image source side, sequentially includes a second lens 430 and a third lens 440. The third group P3, from the eye side to the image source side, sequentially includes a second phase retardation element 480 and an image source surface 491. The total number of refractive lenses in the optical lens group is three, but not limited to this. The optical lens group can be used with an image source 493, and the image source surface 491 can be located on the image source 493. The image source 493 can be a liquid crystal display, an OLED display, or an LED display, but is not limited to these.

[0186] The first lens 410 has positive refractive power, its eye-side surface 411 is convex near the optical axis, and its image-source-side surface 412 is planar near the optical axis. The eye-side surface 411 is aspherical.

[0187] The optical element 420 includes an absorptive polarizing element, a reflective polarizing element, and a first phase retardation element in sequence from the eye side to the image source side. The configuration of these three elements can be referred to the configuration of the absorptive polarizing element 121, the reflective polarizing element 122, and the first phase retardation element 123 in the first embodiment, and will not be described again here.

[0188] The second lens 430 has positive refractive power. Its eye-side surface 431 is planar near the optical axis, and its image-source-side surface 432 is convex near the optical axis. The image-source-side surface 432 is aspherical.

[0189] The third lens 440 has negative refractive power. Its eye-side surface 441 is concave near the optical axis, and its image-source-side surface 442 is convex near the optical axis. The eye-side surface 441 is spherical, and the image-source-side surface 442 is aspherical.

[0190] A partially reflective and partially transmissive element 470 is disposed (e.g., but not limited to, coated) on the image source side surface 442 and has an average light reflectance of at least 30%, preferably 50%, in the visible light range. Here, the average light reflectance refers to the average value of the reflectance of the partially reflective and partially transmissive element 470 for light of different wavelengths.

[0191] The second phase delay element 480 is disposed between the partially reflective and partially transmissive element 470 and the image source surface 491, and is close to the image source surface 491. The second phase delay element 480 is, for example, but not limited to, a quarter-wave plate.

[0192] Please also refer to Tables 13 to 16 below.

[0193]

[0194]

[0195]

[0196] In the fourth embodiment, the curve equation of the aspherical surface is the same as that of the aspherical surface in the first embodiment. The values ​​of each parameter in Table 15 can be derived from Tables 13 and 14, and the values ​​of each conditional expression in Table 16 can be derived from Table 15. In Table 13, the definitions of surfaces 0 to 7 are the same as those of surfaces 0 to 7 in Table 2 of the first embodiment; surfaces 8 and 20 are the gaps between the second lens 430 and the third lens 440 on the optical axis 495; surfaces 9 and 21 are the thickness of the third lens 440 on the optical axis 495; surface 10 is the thickness of the partially reflective and partially transmissive element 470 on the optical axis 495; surface 11 is the gap between the partially reflective and partially transmissive element 470 and the second lens 430 on the optical axis 495; surfaces 12 and 19 are the gaps between the second lens 430 and the second lens 430 on the optical axis 495. Surface 5 is the thickness of the first phase delay element on the optical axis 495; surfaces 13 and 18 are the gaps between the second lens 430 and the first phase delay element on the optical axis 495; surfaces 14 and 17 are the thicknesses of the first phase delay element on the optical axis 495; surfaces 15 and 16 are the thicknesses of the reflective polarizing element on the optical axis 495; surface 22 is the gap between the third lens 440 and the second phase delay element 480 on the optical axis 495; surface 23 is the thickness of the second phase delay element 480 on the optical axis 495; the negative signs of the parameters in the table indicate light reflection and propagation.

[0197] Fifth embodiment

[0198] Please refer to Figures 5A to 5B The optical lens group shown, wherein Figure 5A This is a schematic diagram of the optical lens group of the fifth embodiment of the present invention at the near point. Figure 5BThis is a schematic diagram of the optical lens group of the fifth embodiment of the present invention at the far point. This optical lens group includes a first group P1, a second group P2, and a third group P3 sequentially along the optical axis 595 from the eye side to the image source side. During focusing (or zooming), the second group P2 can be displaced relative to the first group P1 along the optical axis 595 between the first group P1 and the third group P3.

[0199] The first group P1 includes an aperture 500, a first lens group G1, and an optical element 520. The aperture 500 is positioned where the user's eye views the image. The first lens group G1, from the eye side to the image source side, sequentially includes a first lens 510 and a second lens 530. The first lens 510 is located between the aperture 500 and the optical element 520, and the optical element 520 is located between the first lens 510 and the second lens 530. The second group P2, from the eye side to the image source side, sequentially includes a second lens group G2 (i.e., a third lens 540) with positive refractive power and a partially reflective and partially transmissive element 570. The third group P3, from the eye side to the image source side, sequentially includes a second phase retardation element 580 and an image source surface 591. The total number of refractive lenses in the optical lens group is three, but not limited to this. The optical lens group can be used with an image source 593. The image source surface 591 can be located on the image source 593. The image source 593 can be a liquid crystal display, an OLED display, or an LED display, but is not limited to these.

[0200] The first lens 510 has positive refractive power, its eye-side surface 511 is convex near the optical axis, and its image-source-side surface 512 is planar near the optical axis. The eye-side surface 511 is aspherical.

[0201] The optical element 520 includes an absorptive polarizing element, a reflective polarizing element, and a first phase delay element in sequence from the eye side to the image source side. The configuration of these three elements can be referred to the configuration of the absorptive polarizing element 121, the reflective polarizing element 122, and the first phase delay element 123 in the first embodiment, and will not be described again here.

[0202] The second lens 530 has negative refractive power. Its eye-side surface 531 is planar near the optical axis, and its image-source-side surface 532 is concave near the optical axis. The image-source-side surface 532 is aspherical.

[0203] The third lens 540 has positive refractive power. Its eye-side surface 541 is convex near the optical axis, and its image-source-side surface 542 is convex near the optical axis. Both the eye-side surface 541 and the image-source-side surface 542 are aspherical.

[0204] A partially reflective and partially transmissive element 570 is disposed (e.g., but not limited to, coated) on the image source side surface 542 and has an average light reflectance of at least 30%, preferably 50%, in the visible light range. Here, the average light reflectance refers to the average value of the reflectance of the partially reflective and partially transmissive element 570 for light of different wavelengths.

[0205] The second phase delay element 580 is disposed between the partially reflective and partially transmissive element 570 and the image source surface 591, and is close to the image source surface 591. The second phase delay element 580 is, for example, but not limited to, a quarter-wave plate.

[0206] Please also refer to Tables 17 to 20 below.

[0207]

[0208]

[0209]

[0210] In the fifth embodiment, the curve equation of the aspherical surface is the same as that of the aspherical surface in the first embodiment. The values ​​of each parameter in Table 19 can be derived from Tables 17 and 18, and the values ​​of each condition in Table 20 can be derived from Table 19. In Table 17, surfaces 0-5 are defined the same as those in the first embodiment; surfaces 6, 11, and 16 are the thicknesses of the second lens 530 on the optical axis 595; surfaces 7 and 17 are the gaps between the second lens 530 and the third lens 540 on the optical axis 595; surfaces 8 and 18 are the thicknesses of the third lens 540 on the optical axis 595; surfaces 9 and 20 are the thicknesses of the partially reflective and partially transmittance element 570 and the second phase retardation element 580 on the optical axis 595, respectively; surface 10 is the gap between the partially reflective and partially transmittance element 570 and the second lens 530 on the optical axis 595; surfaces 12 and 15 are the thicknesses of the first phase retardation element on the optical axis 595; surfaces 13 and 14 are the thicknesses of the reflective polarizing element on the optical axis 595; surface 19 is the gap between the third lens 540 and the second phase retardation element 580 on the optical axis 595; negative values ​​in the table indicate light reflection and propagation.

[0211] Sixth Embodiment

[0212] Please refer to Figure 6A and 6B The optical lens group shown, wherein Figure 6A This is a schematic diagram of the optical lens assembly of the sixth embodiment of the present invention at the near point. Figure 6BThis is a schematic diagram of the optical lens group of the sixth embodiment of the present invention at the far point. This optical lens group includes a first group P1, a second group P2, and a third group P3 sequentially along the optical axis 695 from the eye side to the image source side. During focusing (or zooming), the second group P2 can be displaced relative to the first group P1 along the optical axis 695 between the first group P1 and the third group P3.

[0213] The first group P1 includes an aperture 600, a first lens group G1, and an optical element 620. The aperture 600 is positioned where the user's eye views the image. The first lens group G1, from the eye side to the image source side, sequentially includes a first lens 610 and a second lens 630, with the first lens 610 located between the aperture 600 and the optical element 620, and the optical element 620 located between the first lens 610 and the second lens 630. The second group P2, from the eye side to the image source side, sequentially includes a second lens group G2 with positive refractive power and a partially reflective and partially transmissive element 670. The second lens group G2, from the eye side to the image source side, sequentially includes a third lens 640 and a fourth lens 650. The third group P3, from the eye side to the image source side, sequentially includes a second phase retardation element 680 and an image source surface 691. The total number of refractive lenses in the optical lens group is four, but not limited to this. The optical lens assembly can be used with the image source 693. The image source surface 691 can be located on the image source 693. The image source 693 can be a liquid crystal display, an OLED display, or an LED display, but is not limited to these.

[0214] The first lens 610 has positive refractive power, its eye-side surface 611 is convex near the optical axis, and its image-source-side surface 612 is planar near the optical axis. The eye-side surface 611 is aspherical.

[0215] The optical element 620 includes an absorptive polarizing element, a reflective polarizing element, and a first phase delay element in sequence from the eye side to the image source side. The configuration of these three elements can be referred to the configuration of the absorptive polarizing element 121, the reflective polarizing element 122, and the first phase delay element 123 in the first embodiment, and will not be described again here.

[0216] The second lens 630 has negative refractive power. Its eye-side surface 631 is planar near the optical axis, and its image-source-side surface 632 is concave near the optical axis. The image-source-side surface 632 is aspherical.

[0217] The third lens 640 has negative refractive power. Its eye-side surface 641 is convex near the optical axis, and its image-source-side surface 642 is concave near the optical axis. Both the eye-side surface 641 and the image-source-side surface 642 are aspherical.

[0218] The fourth lens 650 has positive refractive power. Its eye-side surface 651 is convex near the optical axis, and its image-source-side surface 652 is convex near the optical axis. Both the eye-side surface 651 and the image-source-side surface 652 are aspherical.

[0219] A partially reflective and partially transmissive element 670 is disposed (e.g., but not limited to, coated) on the image source side surface 652 and has an average light reflectance of at least 30%, preferably 50%, in the visible light range. Here, the average light reflectance refers to the average value of the reflectance of the partially reflective and partially transmissive element 670 for light of different wavelengths.

[0220] The second phase delay element 680 is disposed between the partially reflective and partially transmissive element 670 and the image source surface 691, and is close to the image source surface 691. The second phase delay element 680 is, for example, but not limited to, a quarter-wave plate.

[0221] Please also refer to Tables 21 to 24 below.

[0222]

[0223]

[0224]

[0225]

[0226] In the sixth embodiment, the curve equation of the aspherical surface is the same as that of the aspherical surface in the first embodiment. The values ​​of each parameter in Table 23 can be derived from Tables 21 and 22, and the values ​​of each conditional expression in Table 24 can be derived from Table 23. In Table 21, the definitions of surfaces 0 to 7 are the same as those of surfaces 0 to 7 in the first embodiment; surfaces 8, 15, and 24 are the gaps between the second lens 630 and the third lens 640 on the optical axis 695; surfaces 9, 14, and 25 are the thicknesses of the third lens 640 on the optical axis 695; surfaces 10 and 26 are the gaps between the third lens 640 and the fourth lens 650 on the optical axis 695; surfaces 11 and 27 are the thicknesses of the fourth lens 650 on the optical axis 695; surfaces 12 and 28 are the thicknesses of the partially reflective and partially transmissive element 670 on the optical axis 695; surface 13 is the thickness of the partially reflective and partially transmissive element 670. The gap between the transmissive element 670 and the third lens 640 on the optical axis 695; surfaces 16 and 23 are the thickness of the second lens 630 on the optical axis 695; surfaces 17 and 22 are the gap between the second lens 630 and the first phase retardation element on the optical axis 695; surfaces 18 and 21 are the thickness of the first phase retardation element on the optical axis 695; surfaces 19 and 20 are the thickness of the reflective polarizing element on the optical axis 695; surface 29 is the thickness of the second phase retardation element 680 on the optical axis 695; the negative signs of the parameters in the table indicate light reflection and propagation.

[0227] Seventh Embodiment

[0228] Please refer to Figure 7A and 7B The optical lens group shown, wherein Figure 7A This is a schematic diagram of the optical lens group of the seventh embodiment of the present invention at the near point. Figure 7B This is a schematic diagram of the optical lens group of the seventh embodiment of the present invention at the far point. This optical lens group includes a first group P1, a second group P2, and a third group P3 sequentially along the optical axis 795 from the eye side to the image source side. During focusing (or zooming), the second group P2 can be displaced relative to the first group P1 along the optical axis 795 between the first group P1 and the third group P3.

[0229] The first group P1 includes an aperture 700, a first lens group G1, and an optical element 720. The aperture 700 is positioned where the user's eye views the image. The first lens group G1, from the eye side to the image source side, sequentially includes a first lens 710, a second lens 730, and a third lens 740. The first lens 710 is located between the aperture 700 and the optical element 720, and the optical element 720 is located between the first lens 710 and the second lens 730. The second group P2, from the eye side to the image source side, sequentially includes a second lens group G2 (i.e., the fourth lens 750) with positive refractive power and a partially reflective and partially transmissive element 770. The third group P3, from the eye side to the image source side, sequentially includes a second phase retardation element 780 and an image source surface 791. The total number of refractive lenses in the optical lens group is four, but not limited to this. The optical lens assembly can be used with the image source 793. The image source surface 791 can be located on the image source 793. The image source 793 can be a liquid crystal display, an OLED display, or an LED display, but is not limited to these.

[0230] The first lens 710 has positive refractive power, its eye-side surface 711 is convex near the optical axis, and its image-source-side surface 712 is planar near the optical axis. The eye-side surface 711 is aspherical.

[0231] The optical element 720 includes an absorptive polarizing element, a reflective polarizing element, and a first phase retardation element in sequence from the eye side to the image source side. The configuration of these three elements can be referred to the configuration of the absorptive polarizing element 121, the reflective polarizing element 122, and the first phase retardation element 123 in the first embodiment, and will not be described again here.

[0232] The second lens 730 has negative refractive power. Its eye-side surface 731 is planar near the optical axis, and its image-source-side surface 732 is concave near the optical axis. The image-source-side surface 732 is aspherical.

[0233] The third lens 740 has positive refractive power. Its eye-side surface 741 is convex near the optical axis, and its image-source-side surface 742 is concave near the optical axis. Both the eye-side surface 741 and the image-source-side surface 742 are aspherical.

[0234] The fourth lens 750 has positive refractive power. Its eye-side surface 751 is convex near the optical axis, and its image-source-side surface 752 is convex near the optical axis. Both the eye-side surface 751 and the image-source-side surface 752 are aspherical.

[0235] A partially reflective and partially transmissive element 770 is disposed (e.g., but not limited to, coated) on the image source side surface 752 and has an average light reflectance of at least 30%, preferably 50%, in the visible light range. Here, the average light reflectance refers to the average value of the reflectance of the partially reflective and partially transmissive element 770 for light of different wavelengths.

[0236] The second phase delay element 780 is disposed between the partially reflective and partially transmissive element 770 and the image source surface 791, and is close to the image source surface 791. The second phase delay element 780 is, for example, but not limited to, a quarter-wave plate.

[0237] Please also refer to Tables 25 to 28 below.

[0238]

[0239]

[0240]

[0241] In the seventh embodiment, the curve equation for the aspherical surface is the same as that in the first embodiment. The values ​​of each parameter in Table 27 can be derived from Tables 25 and 26, and the values ​​of each conditional expression in Table 28 can be derived from Table 27. The definitions of surfaces 0 to 30 in Table 25 are the same as those of surfaces 0 to 30 in the sixth embodiment.

[0242] Eighth embodiment

[0243] Please refer to Figure 8A and 8B The optical lens group shown, wherein Figure 8A This is a schematic diagram of the optical lens group of the eighth embodiment of the present invention at the near point. Figure 8B This is a schematic diagram of the optical lens group of the eighth embodiment of the present invention at the far point. This optical lens group includes a first group P1, a second group P2, and a third group P3 sequentially along the optical axis 895 from the eye side to the image source side. During focusing (or zooming), the second group P2 can be displaced relative to the first group P1 along the optical axis 895 between the first group P1 and the third group P3.

[0244] The first group P1 includes an aperture 800, a first lens group G1 (i.e., the first lens 810), and an optical element 820. The aperture 800 is positioned where the user's eye views the image. The first lens 810 is located between the aperture 800 and the optical element 820. The second group P2, from the eye side to the image source side, sequentially includes a second lens group G2 with positive refractive power and a partially reflective and partially transmissive element 870. The second lens group G2, from the eye side to the image source side, sequentially includes a second lens 830, a third lens 840, and a fourth lens 850. The third group P3, from the eye side to the image source side, sequentially includes a second phase retardation element 880 and an image source surface 891. The total number of refractive lenses in the optical lens group is four, but not limited to this. The optical lens group can be used with an image source 893, and the image source surface 891 can be located on the image source 893. The image source 893 can be a liquid crystal display, an OLED display, or an LED display, but is not limited to these.

[0245] The first lens 810 has positive refractive power, its eye-side surface 811 is convex near the optical axis, and its image-source-side surface 812 is planar near the optical axis. The eye-side surface 811 is aspherical.

[0246] The optical element 820 includes an absorptive polarizing element, a reflective polarizing element, and a first phase retardation element in sequence from the eye side to the image source side. The configuration of these three elements can be referred to the configuration of the absorptive polarizing element 121, the reflective polarizing element 122, and the first phase retardation element 123 in the first embodiment, and will not be described again here.

[0247] The second lens 830 has negative refractive power. Its eye-side surface 831 is planar near the optical axis, and its image-source-side surface 832 is concave near the optical axis. The image-source-side surface 832 is aspherical.

[0248] The third lens 840 has positive refractive power. Its eye-side surface 841 is convex near the optical axis, and its image-source-side surface 842 is convex near the optical axis. Both the eye-side surface 841 and the image-source-side surface 842 are aspherical.

[0249] The fourth lens 850 has positive refractive power. Its eye-side surface 851 is convex near the optical axis, and its image-source-side surface 852 is convex near the optical axis. Both the eye-side surface 851 and the image-source-side surface 852 are aspherical.

[0250] A partially reflective and partially transmissive element 870 is disposed (e.g., but not limited to, coated) on the image source side surface 852 and has an average light reflectance of at least 30%, preferably 50%, in the visible light range. Here, the average light reflectance refers to the average value of the reflectance of the partially reflective and partially transmissive element 870 for light of different wavelengths.

[0251] The second phase delay element 880 is disposed between the partially reflective and partially transmissive element 870 and the image source surface 891, and is close to the image source surface 891. The second phase delay element 880 is, for example, but not limited to, a quarter-wave plate.

[0252] Please also refer to Tables 29 to 32 below.

[0253]

[0254]

[0255]

[0256] In the eighth embodiment, the curve equation for the aspherical surface is the same as that in the first embodiment. The values ​​of each parameter in Table 31 can be derived from Tables 29 and 30, and the values ​​of each conditional expression in Table 32 can be derived from Table 31. The definitions of surfaces 0 to 30 in Table 29 are the same as those of surfaces 0 to 30 in the sixth embodiment.

[0257] The optical lens assembly provided by this invention allows the lenses to be made of either plastic or glass. Using plastic effectively reduces production costs, while using glass increases the freedom of refractive power configuration. Furthermore, the aspherical lens surfaces in the optical lens assembly can be fabricated into shapes other than spherical to obtain more control variables and reduce aberrations, thereby reducing the number of lenses used and effectively lowering the overall length of the optical lens assembly.

[0258] In the optical lens assembly provided by the present invention, taking a lens with refractive power as an example, if the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex near the optical axis; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave near the optical axis.

[0259] Furthermore, the optical lens assembly provided by this invention can be applied to head-mounted electronic devices. Please refer to [link / reference]. Figure 9 The diagram shown is a schematic of a head-mounted electronic device according to an embodiment of the present invention. This head-mounted electronic device 9 is, for example, but not limited to, a head-mounted display using Virtual Reality (VR) technology, and includes a housing 910 and an optical engine module 920, an image source 930, and a controller 940 disposed within the housing 910.

[0260] The optical engine module 920 corresponds to the user's left and right eyes respectively. The optical engine module 920 includes an optical lens group, and this optical lens group can be any of the optical lens groups in the first embodiment to the eighth embodiment.

[0261] The image source 930 can be any of the image sources in the first to eighth embodiments. The image source 930 can correspond to the left eye and the right eye respectively, and the type of image source 930 can be a liquid crystal display, an LED display, or an OLED display, but is not limited thereto.

[0262] The controller 940 is electrically connected to the image source 930 to control the image source 930 to display images, thereby allowing the head-mounted electronic device 9 to project stereoscopic images onto the user's eyes and form virtual images.

[0263] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An optical lens assembly, characterized in that: It has three groups, which are contained sequentially from the target side to the image source side: The first group includes: A first lens group comprising one, two, or three lenses, wherein the eye-side surface of the lens closest to the eye in the first lens group is convex near the optical axis; and The optical elements, from the eye side to the image source side, sequentially include an absorptive polarizing element, a reflective polarizing element, and a first phase retardation element; The second group, from the eye side to the image source side, includes: A second lens group, having positive refractive power, comprises one, two, or three lenses, wherein the image source-side surface of the lens closest to the image source side in the second lens group is convex near the optical axis; and Partially reflective and partially transmissive elements; and The third group, from the eye side to the image source side, sequentially includes a second phase delay element and an image source surface; The optical lens group contains 2, 3, or 4 lenses with refractive power. The overall focal length of the first lens group is f_G1, the overall focal length of the second lens group is f_G2, the overall focal length of the optical lens group at near point is EFL_N, the overall focal length of the optical lens group at far point is EFL_F, the distance on the optical axis from the eye-side surface of the lens closest to the eye in the first lens group to the image source surface is TL, and the maximum image source height of the optical lens group is IMH, satisfying the following conditions: -0.48 < f_G2 / f_G1 < 2.15 and 0.51 < EFL_N*TL / (EFL_F*IMH) < 1.

56.

2. The optical lens assembly according to claim 1, characterized in that: The distance from the image source side surface of the lens closest to the image source side in the first lens group to the image source surface on the optical axis is MS2. The overall focal length of the optical lens group at the far point is EFL_F, and satisfies the following condition: 0.27 < MS2 / EFL_F < 0.

92.

3. The optical lens assembly according to claim 1, characterized in that: At the far point, the distance on the optical axis between the image source side surface of the lens closest to the image source side in the first lens group and the eye side surface of the lens closest to the eye side in the second lens group is T12_F. At the near point, the distance on the optical axis between the image source side surface of the lens closest to the image source side in the first lens group and the eye side surface of the lens closest to the eye side in the second lens group is T12_N. The overall focal length of the optical lens group at the near point is EFL_N, and satisfies the following condition: 0.06 < (T12_F – T12_N) / EFL_N < 0.

50.

4. The optical lens assembly according to claim 1, characterized in that: The distance on the optical axis from the eye-side surface of the lens closest to the eye side in the first lens group to the image-source-side surface of the lens closest to the image-source side in the first lens group is GCT1, and the distance on the optical axis from the image-source-side surface of the lens closest to the image-source side in the first lens group to the image-source surface is MS2, and the following condition is satisfied: 0.11 < GCT1 / MS2 < 1.

19.

5. The optical lens assembly according to claim 1, characterized in that: The overall focal length of the second lens group is f_G2. At near point, the distance on the optical axis from the eye-side surface of the lens closest to the eye in the second lens group to the image source surface is MS3_N. At far point, the distance on the optical axis from the eye-side surface of the lens closest to the eye in the second lens group to the image source surface is MS3_F, and the following condition is satisfied: 0.38mm -1 <f_G2 / (MS3_N*MS3_F)<3.06mm -1 .

6. The optical lens assembly according to claim 1, characterized in that: At the far point, the distance from the eye-side surface of the lens closest to the eye in the second lens group to the image source surface on the optical axis is MS3_F, the overall focal length of the first lens group is f_G1, and the following condition is satisfied: -0.04<MS3_F / f_G1<0.

10.

7. The optical lens assembly according to claim 1, characterized in that: At near point, the distance on the optical axis from the eye-side surface of the lens closest to the eye in the second lens group to the image source surface is MS3_N, and the distance on the optical axis from the eye-side surface of the lens closest to the eye in the second lens group to the image source surface of the lens closest to the image source in the second lens group is GCT2, and the following condition is satisfied: 0.78 < MS3_N / GCT2 < 3.

98.

8. The optical lens assembly according to claim 1, characterized in that: The radius of curvature of the eye-side surface of the lens closest to the eye in the first lens group is R1. The overall focal length of the optical lens group at near point is EFL_N, and the overall focal length of the optical lens group at far point is EFL_F, satisfying the following condition: 0.06mm -1 <R1 / (EFL_N*EFL_F)<1.48mm -1 .

9. The optical lens assembly according to claim 1, characterized in that: The overall focal length of the optical lens group at the far point is EFL_F. The radius of curvature of the eye-side surface of the lens closest to the eye in the first lens group is R1, and it satisfies the following condition: 0.02 < EFL_F / R1 < 0.

45.

10. The optical lens assembly according to claim 1, characterized in that: The distance from the eye-side surface of the lens closest to the eye in the first lens group to the image source surface on the optical axis is TL. The overall focal length of the optical lens group at near point is EFL_N, and satisfies the following condition: 0.43 < TL / EFL_N < 1.

35.

11. The optical lens assembly according to claim 1, characterized in that: The distance on the optical axis between the eye-side surface of the lens closest to the eye side in the first lens group and the image-source-side surface of the lens closest to the image source side in the first lens group is GCT1, and the distance on the optical axis between the eye-side surface of the lens closest to the eye side in the second lens group and the image-source-side surface of the lens closest to the image source side in the second lens group is GCT2, and the following condition is satisfied: 0.45 < GCT2 / GCT1 < 4.

64.

12. The optical lens assembly according to claim 1, characterized in that: The radius of curvature of the eye-side surface of the lens closest to the eye side in the second lens group is R3, and the radius of curvature of the image-source-side surface of the lens closest to the image source side in the second lens group is R4, and the following condition is satisfied: -0.83 < R4 / R3 < 0.

54.

13. The optical lens assembly according to claim 1, characterized in that: The distance from the image source side surface of the lens closest to the image source side in the first lens group to the image source surface on the optical axis is MS2. The overall focal length of the second lens group is f_G2, and the following condition is satisfied: 0.04<MS2 / f_G2<0.

18.

14. The optical lens assembly according to claim 1, characterized in that: The maximum viewing angle of the optical lens group at the far point is FOV_F. The distance on the optical axis from the image source side surface of the lens closest to the image source side in the first lens group to the eye side surface of the lens closest to the eye side in the second lens group at the far point is T12_F. The maximum image source height of the optical lens group is IMH, and the following condition is satisfied: 0.18 < FOV_F / (T12_F * IMH) < 3.

18.

15. A head-mounted electronic device, characterized in that: Include: shell; The optical lens assembly as described in any one of claims 1 to 14 is disposed within the housing; An image source is disposed within the housing and positioned on the image source surface of the optical lens group; and The controller is located inside the housing and is electrically connected to the image source.

Images