TWI804345B - Optical lens assembly and head-mounted electronic device - Google Patents

Abstract

An optical lens assembly includes, from a view side to an image source side: a first group, including a first lens group and an optical component, and the optical component including, from the view side to the image source side, an absorptive polarizer, a reflective polarizer and a first light phase retarder; a second group, including from the view side to the image source side, a second lens group of positive refractive power and a partial reflective-and-transmissive element; and a third group, including from the view side to the image source side, a second light phase retarder and an image source plane. The optical lens assembly has less weight, a zoom function and better image quality if satisfying one or more specific conditions.

Description

Optical lens group and head-mounted electronic device

The invention relates to an optical lens group and a head-mounted electronic device, in particular to an optical lens group applicable to the head-mounted electronic device.

With the development of the semiconductor industry, various consumer electronic products have increasingly powerful functions, coupled with the emergence of various services on the software application side, providing consumers with more choices. When the market is no longer satisfied with handheld electronics, head-mounted displays have emerged. However, current head-mounted displays are heavy and have poor image quality.

Moreover, the existing head-mounted displays are all fixed-focus designs, so users with myopia or hyperopia need to wear their inherent glasses. This can affect the wearing comfort and the performance of the head-mounted display.

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

In order to achieve the above purpose, an optical lens group provided by an embodiment of the present invention has three groups, and the three groups include in sequence from the eye side to the image source side: a first group, including: a first A lens group, comprising one, two or three lenses, the eye side surface of the lens closest to the eye side in the first lens group is convex at the near optical axis; and an optical element, from the eye side to the image source The side sequentially includes an absorbing polarizing element, a reflective polarizing element and a first phase delay element; a second group, from the eye side to the image source side sequentially includes: a second lens group with positive refractive power, Comprising one, two or three lenses, the image source side surface of the lens closest to the image source side in the second lens group is convex at the near optical axis; and a part of the reflective part of the transmissive element; and a third group , the eye side to the image source side sequentially include a second phase delay element and an image source surface.

Wherein, 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 the near point is EFL_N, and 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 to the image source surface on the optical axis is TL, the maximum image source height of the optical lens group is IMH, and the following conditions are met: -0.48<f_G2/f_G1<2.15 and 0.51<EFL_N*TL/(EFL_F*IMH)<1.56. When f_G2∕f_G1 is satisfied, the refractive power distribution of the optical lens group can be more appropriate, and aberrations can be reduced. When EFL_N*TL∕(EFL_F*IMH) is satisfied, an appropriate balance can be achieved between the miniaturization of the optical lens group and the size of the light-emitting area of the display within the zoom range.

Optionally, the total number of lenses with refractive power in the optical lens group is 2, 3 or 4.

The distance from the image source side surface of the lens closest to the image source side to the image source surface on the optical axis in the first lens group 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. Thereby, the lengths of the elements of the optical lens group can be allocated reasonably, and the sensitivity to assembly tolerances can be reduced.

When the optical lens group is at the far point, the distance 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 on the optical axis The distance is T12_F, when the optical lens group is at the near point, the image source side surface of the lens closest to the image source side in the first lens group is to the eye side surface of the lens closest to the eye side in the second lens group The distance on the optical axis is T12_N, the overall focal length of the optical lens group at the near point is EFL_N, and the following condition is satisfied: 0.06<(T12_F−T12_N)/EFL_N<0.50. Thereby, an optimal balance between performance and miniaturization of the optical lens group can be ensured within the zoom range.

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, the first lens 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 in the group is MS2, and satisfies the following condition: 0.11<GCT1/MS2<1.19. Thereby, it is helpful to obtain a proper balance between the lens formability and the refractive power of the first lens group.

The overall focal length of the second lens group is f_G2, and when the optical lens group is at the near point, the distance from the eye side surface of the lens closest to the eye side in the second lens group to the image source surface on the optical axis is MS3_N, When the optical lens group is at the far point, the distance from the eye side surface of the lens closest to the eye side in the second lens group to the image source surface on the optical axis is MS3_F, and the following conditions are satisfied: 0.38mm ^-1 <f_G2 ∕(MS3_N*MS3_F)＜3.06mm ^-1 . This ensures an optimal balance between lens formability and miniaturization in the zoom range.

When the optical lens group is at the far point, the distance from the eye side surface of the lens closest to the eye side 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, And satisfy the following conditions: -0.04<MS3_F∕f_G1<0.10. Thereby, it is helpful to obtain a proper balance between the lens formability and the refractive power of the first lens group.

When the optical lens group is at the near point, the distance from the eye side surface of the lens closest to the eye side in the second lens group to the image source surface on the optical axis is MS3_N, and the distance from the eye side surface of the lens closest to the eye side in the second lens group is The distance on the optical axis from the eye side surface of the lens to the image source side surface of the lens closest to the image source side in the second lens group is GCT2, and satisfies the following condition: 0.78<MS3_N/GCT2<3.98. Thereby, it is helpful to improve the focusing space of the optical lens group.

The radius of curvature of the eye side surface of the lens closest to the eye side in the first lens group is R1, the overall focal length of the optical lens group at the near point is EFL_N, and the overall focal length of the optical lens group at the far point is EFL_F , and satisfy the following conditions: 0.06mm ^-1 <R1∕(EFL_N*EFL_F)<1.48mm ^-1 . Thereby, the distortion of the optical lens group during focusing can be effectively reduced.

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 side in the first lens group is R1, and the following conditions are satisfied: 0.02<EFL_F/R1<0.45. Thereby, the distortion of the optical lens group can be effectively improved, the aberration can be reduced, and the size of the lens can be reduced.

The distance from the eye side surface of the lens closest to the eye side 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 the near point is EFL_N, and the following conditions are met: 0.43<TL/EFL_N<1.35. Thereby, proper lens formability and proper length of the optical lens group can be maintained.

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 second lens The distance on the optical axis from the eye side surface of the lens closest to the eye side in the group to the image source side surface of the lens closest to the image source side in the second lens group is GCT2, and the following conditions are satisfied: 0.45<GCT2 /GCT1<4.64. In this way, on the premise of satisfying the image quality, the thickness of the lens can be guaranteed to meet the processing requirements of the lens manufacturing process.

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 satisfy The following conditions: -0.83<R4/R3<0.54. By restricting the two radii of curvature to each other, the radii of curvature can be prevented from being too small and the sensitivity to assembly tolerance can be reduced.

The distance from the image source side surface of the lens closest to the image source side to the image source surface on the optical axis in the first lens group is MS2, the overall focal length of the second lens group is f_G2, and the following conditions are satisfied: 0.04 <MS2∕f_G2<0.18. Thereby, it is helpful to achieve a proper balance between the spatial size of the two lens groups and the refractive power of the second lens group.

The maximum viewing angle of the optical lens group at the far point is FOV_F, the image source side surface of the lens closest to the image source side in the first lens group to the closest to the second lens group when the optical lens group is at the far point The distance between the eye side surface of the lens on the eye side and the optical axis is T12_F, the maximum image source height of the optical lens group is IMH, and the following conditions are satisfied: 0.18<FOV_F/(T12_F*IMH)<3.18. In this way, while meeting the size of the field of view of the human eye to achieve a better sense of immersion, it can also meet the demand for lightweight.

Optionally, the first group remains stationary while zooming.

Optionally, the optical element is located on the image source side surface of the lens closest to the eye side in the first lens group.

Optionally, the third group remains stationary while zooming.

Optionally, the second group moves from the image source side to the eye side when zooming from the near point to the far point.

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

Optionally, the overall focal length of the second lens group is f_G2 and satisfies the following condition: 56.78mm<f_G2<432.03mm.

Optionally, when the optical lens group is at the near point, the distance from the eye side surface of the lens closest to the eye side in the second lens group to the image source surface on the optical axis is MS3_N, and the following conditions are met: 6.43 mm<MS3_N<27.92mm.

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

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

Optionally, the maximum image source height of the optical lens group is IMH, and satisfies the following condition: 8.08mm<IMH<37.72mm.

A head-mounted electronic device, comprising: a housing; an optical lens group disposed in the housing; an image source disposed in the housing and configured on the image source surface of the optical lens group; and a controller, It is arranged in the casing and electrically connected to the image source. The optical lens group has three groups, and the three groups sequentially include from the eye side to the image source side: a first group, including: a first lens group, including one, two or three lenses , the eye side surface of the lens closest to the eye side in the first lens group is a convex surface at the near optical axis; A polarizing element and a first phase delay element; a second group, which includes in sequence from the eye side to the image source side: a second lens group, with positive refractive power, including one, two or three lenses, the second The image source side surface of the lens closest to the image source side in the lens group is a convex surface at the near optical axis; and a part of the reflective part of the transmissive element; and a third group, the eye side to the image source side sequentially includes a second A phase delay element and an image source surface.

Wherein, 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 the near point is EFL_N, and 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 to the image source surface on the optical axis is TL, the maximum image source height of the optical lens group is IMH, and the following conditions are met: -0.48<f_G2/f_G1<2.15 and 0.51<EFL_N*TL/(EFL_F*IMH)<1.56. When f_G2∕f_G1 is satisfied, the refractive power distribution of the optical lens group can be more appropriate, and aberrations can be reduced. When EFL_N*TL∕(EFL_F*IMH) is satisfied, an appropriate balance can be achieved between miniaturization and the size of the light-emitting area of the display within the zoom range.

Optionally, the total number of lenses with refractive power in the optical lens group is 2, 3 or 4.

The distance from the image source side surface of the lens closest to the image source side to the image source surface on the optical axis in the first lens group 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. Thereby, the lengths of the elements of the optical lens group can be allocated reasonably, and the sensitivity to assembly tolerances can be reduced.

When the optical lens group is at the far point, the distance 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 on the optical axis The distance is T12_F, when the optical lens group is at the near point, the image source side surface of the lens closest to the image source side in the first lens group is to the eye side surface of the lens closest to the eye side in the second lens group The distance on the optical axis is T12_N, the overall focal length of the optical lens group at the near point is EFL_N, and the following condition is satisfied: 0.06<(T12_F−T12_N)/EFL_N<0.50. Thereby, an optimal balance between performance and miniaturization of the optical lens group can be ensured within the zoom range.

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, the first lens 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 in the group is MS2, and satisfies the following condition: 0.11<GCT1/MS2<1.19. Thereby, it is helpful to achieve a proper balance between the lens formability and refractive power in the first lens group.

The overall focal length of the second lens group is f_G2, and when the optical lens group is at the near point, the distance from the eye side surface of the lens closest to the eye side in the second lens group to the image source surface on the optical axis is MS3_N, When the optical lens group is at the far point, the distance from the eye side surface of the lens closest to the eye side in the second lens group to the image source surface on the optical axis is MS3_F, and the following conditions are satisfied: 0.38mm ^-1 <f_G2 ∕(MS3_N*MS3_F)＜3.06mm ^-1 . This ensures an optimal balance between lens formability and miniaturization in the zoom range.

When the optical lens group is at the far point, the distance from the eye side surface of the lens closest to the eye side 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, And satisfy the following conditions: -0.04<MS3_F∕f_G1<0.10. Thereby, it is helpful to achieve a proper balance between the lens formability and refractive power in the first lens group.

When the optical lens group is at the near point, the distance from the eye side surface of the lens closest to the eye side in the second lens group to the image source surface on the optical axis is MS3_N, and the distance from the eye side surface of the lens closest to the eye side in the second lens group is The distance on the optical axis from the eye side surface of the lens to the image source side surface of the lens closest to the image source side in the second lens group is GCT2, and satisfies the following condition: 0.78<MS3_N/GCT2<3.98. Thereby, it is helpful to improve the focusing space of the optical lens group.

The radius of curvature of the eye side surface of the lens closest to the eye side in the first lens group is R1, the overall focal length of the optical lens group at the near point is EFL_N, and the overall focal length of the optical lens group at the far point is EFL_F , and satisfy the following conditions: 0.06mm ^-1 <R1∕(EFL_N*EFL_F)<1.48mm ^-1 . Thereby, the distortion of the optical lens group during focusing can be effectively reduced.

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 side in the first lens group is R1, and the following conditions are satisfied: 0.02<EFL_F/R1<0.45. Thereby, the distortion of the optical lens group can be effectively improved, the aberration can be reduced, and the size of the lens can be reduced.

The distance from the eye side surface of the lens closest to the eye side 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 the near point is EFL_N, and the following conditions are satisfied: 0.43<TL/EFL_N<1.35. Thereby, proper lens formability and proper length of the optical lens group can be maintained.

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 second lens The distance on the optical axis from the eye side surface of the lens closest to the eye side in the group to the image source side surface of the lens closest to the image source side in the second lens group is GCT2, and the following conditions are satisfied: 0.45<GCT2 /GCT1<4.64. In this way, on the premise of satisfying the image quality, the thickness of the lens can be guaranteed to meet the processing requirements of the lens manufacturing process.

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 satisfy The following conditions: -0.83<R4/R3<0.54. By restricting the two radii of curvature to each other, it is possible to prevent the radii of curvature from being too small and reduce sensitivity to assembly tolerances.

The distance from the image source side surface of the lens closest to the image source side to the image source surface on the optical axis in the first lens group is MS2, the overall focal length of the second lens group is f_G2, and the following conditions are met: 0.04 <MS2∕f_G2<0.18. Thereby, it is helpful to achieve a proper balance between the spatial size of the two lens groups and the refractive power of the second lens group.

The maximum viewing angle of the optical lens group at the far point is FOV_F, the image source side surface of the lens closest to the image source side in the first lens group to the closest to the second lens group when the optical lens group is at the far point The distance between the eye side surface of the lens on the eye side and the optical axis is T12_F, the maximum image source height of the optical lens group is IMH, and the following conditions are satisfied: 0.18<FOV_F/(T12_F*IMH)<3.18. In this way, while meeting the size of the field of view of the human eye to achieve a better sense of immersion, it can also meet the demand for lightweight.

Optionally, the first group remains stationary while zooming.

Optionally, the optical element is located on the image source side surface of the lens closest to the eye side in the first lens group.

Optionally, the third group remains stationary while zooming.

Optionally, the second group moves from the image source side to the eye side when zooming from the near point to the far point.

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

Optionally, the overall focal length of the second lens group is f_G2 and satisfies the following condition: 56.78mm<f_G2<432.03mm.

Optionally, when the optical lens group is at the near point, the distance from the eye side surface of the lens closest to the eye side in the second lens group to the image source surface on the optical axis is MS3_N, and the following conditions are met: 6.43 mm<MS3_N<27.92mm.

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

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

Optionally, the maximum image source height of the optical lens group is IMH, and satisfies the following condition: 8.08mm<IMH<37.72mm.

<First embodiment>

Please refer to one of the optical lens groups shown in Figures 1A to 1D, wherein Figure 1A is a schematic diagram of the optical lens group of the first embodiment of the present invention at the near point, and Figure 1B is a schematic diagram of the optical lens group of the first embodiment of the present invention at the far point 1C is a partially enlarged view of FIG. 1A , and FIG. 1D is a schematic diagram of parameters and optical paths of the optical lens group in the first embodiment of the present invention. The optical lens group sequentially includes a first group P1 , a second group P2 and a third group P3 along the optical axis 195 from the eye side to the image source side. During the focusing (or zooming) process, 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.

The first group P1 includes an aperture 100 , a first lens group G1 (ie, a first lens 110 ) and an optical element 120 . The position of the aperture 100 can be the position where the user's eyes watch the image. The first lens 110 is located between the aperture 100 and the optical element 120 . The second group P2 includes a second lens group G2 (that is, a second lens 130 ) with positive refractive power and a part of reflective part of transmissive element 170 sequentially from the eye side to the image source side. The third group P3 includes a second phase delay element 180 and an image source surface 191 sequentially from the eye side to the image source side. The total number of lenses with refractive power in the optical lens group is two, but not limited thereto. The optical lens group can be used with an image source 193 , the image source surface 191 can be located on the image source 193 , and the type of the image source 193 can be a liquid crystal display, an OLED display or an LED display, but not limited thereto.

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

The optical element 120 includes an absorbing polarizing element 121, a reflective polarizing element 122 and a first phase retardation element 123 in order from the eye side to the image source side. These three elements can be stacked (such as but not limited to film ) on the image source side surface 112, and the two opposite surfaces of the elements are planes. Specifically, the absorbing polarizer 121 is attached on the image source side surface 112, the reflective polarizer 122 is attached on the absorbing polarizer 121, and the first phase delay element 123 is attached on the reflective polarizer 122 . The first phase delay element 123 is, for example but not limited to, a quarter wave plate.

The second lens 130 has positive refractive power, its eye side surface 131 is convex at the near optical axis, and its image source side surface 132 is convex at the near optical axis. Both the eye side surface 131 and the image source side surface 132 are aspherical.

The partially reflective and partially transmissive element 170 is disposed (such as but not limited to a coating) on the image source side surface 132 and has an average light reflectance of at least 30% in the visible light range, preferably an average light reflectance of 50%. The average light reflectance here refers to the average value of the reflectance of the partially reflective and partially transmissive element 170 for different wavelengths of light.

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.

其中z為沿光軸195方向在高度為h的位置以表面頂點作參考的位置值；c為透鏡表面於近光軸處的曲率，並為曲率半徑(R)的倒數(c=1∕R)，R為透鏡表面近光軸處的曲率半徑；h為透鏡表面距離光軸195的垂直距離；k為圓錐係數(conic constant)；Ai為第i階非球面係數。 The curve equations of the aspheric surfaces of the above-mentioned lenses are expressed as follows:

Among them, z is the position value at the position of height h along the optical axis 195, taking the surface vertex as a reference; c is the curvature of the lens surface at the near optical axis, and is the reciprocal of the radius of curvature (R) (c=1/R ), R is the radius of curvature near the optical axis of the lens surface; h is the vertical distance from the lens surface to the optical axis 195; k is the conic constant; Ai is the i-th order aspheric coefficient.

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 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, the optical lens The image source side surface of the lens closest to the image source side in the first lens group (that is, the image source side surface 112 of the first lens 110) at the near point to the eye side of the lens closest to the eye side in the second lens group The distance between the surface (i.e. the eye side surface 131 of the second lens 130) on the optical axis 195 is T12_N. The distance from the image source side surface 112) of a lens 110 to the eye side surface of the lens closest to the eye side in the second lens group (that is, the eye side surface 131 of the second lens 130) on the optical axis 195 is T12_F, the optical lens The maximum viewing angle when the group is at the near point is FOV_N, and the maximum viewing angle when the optical lens group is at the far point is FOV_F. 111) 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 G1 (that is, the image source side surface 112 of the first lens 110) is GCT1, and in the second lens group G2 From the eye side surface of the lens closest to the eye side (that is, the eye side surface 131 of the second lens 130) to the image source side surface of the lens closest to the image source side in the second lens group G2 (that is, the image source of the second lens 130) The distance between the side surface 132) on the optical axis 195 is GCT2. When the optical lens group is at the near point, the eye side surface of the lens closest to the eye side in the second lens group G2 (that is, the eye side surface 131 of the second lens 130) to The distance between the image source surface 191 on the optical axis 195 is MS3_N, when the optical lens group is at the far point, the eye side surface of the lens closest to the eye side in the second lens group G2 (that is, the eye side surface 131 of the second lens 130) to The distance between the image source surface 191 on the optical axis 195 is MS3_F, from the image source side surface of the lens closest to the image source side in the first lens group G1 (that is, the image source side surface 112 of the first lens 110) to the image source surface 191 The distance on the optical axis 195 is MS2, the radius of curvature of the eye-side surface of the lens closest to the eye side in the first lens group G1 (that is, the eye-side surface 111 of the first lens 110) is R1, and in the first lens group G1 The radius of curvature of the image source side surface of the lens closest to the image source side (i.e. the image source side surface 112 of the first lens 110) is R2, and the eye side surface of the lens closest to the eye side in the second lens group G2 (i.e. the second The radius of curvature of the eye side surface 131) of the second lens 130 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 (i.e. the image source side surface 132 of the second lens 130) is R3. R4, the distance from the eye side surface of the lens closest to the eye side in the first lens group G1 (that is, 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 of the optical lens group The height of the image source is IMH (usually the radius of the inscribed circle of the image source surface 191 ), and the values of these parameters are shown in Table 1 below.

Table 1 EFL_N(mm) 31.26 MS3_N(mm) 19.94 EFL_F(mm) 35.31 MS3_F(mm) 8.86 F_G1(mm) 2138.93 MS2(mm) 21.01 F_G2(mm) 175.91 R1(mm) 1167.38 T12_N(mm) 1.07 R2(mm) unlimited T12_F(mm) 12.15 R3(mm) 449.81 FOV_N (degrees) 123.0 R4(mm) -121.39 FOV_F (degrees) 94.8 TL(mm) 25.48 GCT1(mm) 4.47 IMH(mm) 26.64 GCT2(mm) 7.01 – –

It can be inferred from Table 1 that the optical lens group meets the conditions in Table 2 below:

Table 2 f_G2/f_G1 0.08 R1/(EFL_N*EFL_F)[mm ^-1 ] 1.06 EFL_N*TL/(EFL_F*IMH) 0.85 EFL_F/R1 0.03 MS2/EFL_F 0.59 TL/EFL_N 0.82 (T12_F–T12_N)/EFL_N 0.35 GCT2/GCT1 1.57 GCT1/(MS2) 0.21 R4/R3 -0.27 f_G2/(MS3_N*MS3_F)[mm ^-1 ] 1.00 MS2/f_G2 0.12 MS3_F/f_G1 0.004 FOV_F/(T12_F*IMH) 0.29 MS3_N/GCT2 2.84 – –

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.

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, and the objective of the lens closest to the eye side in the first lens group G1 is The distance from the side surface 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.

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, when the optical lens group is at the far point The overall focal length of is EFL_F, and satisfies the following condition: MS2∕EFL_F＝0.59.

In the optical lens group of the first embodiment, when the optical lens group is at the far point, 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 The distance on the optical axis 195 is T12_F, 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 when the optical lens group is at the near point The distance on the optical axis 195 is T12_N, the overall focal length of the optical lens group at the near point is EFL_N, and the following condition is satisfied: (T12_F−T12_N)/EFL_N=0.35.

In the optical lens group of the first embodiment, 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 are on the optical axis 195 The distance is GCT1, 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.

In the optical lens group of the first embodiment, the overall focal length of the second lens group G2 is f_G2. The distance on the optical axis 195 is MS3_N, when the optical lens group is 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, and satisfies the following Condition: f_G2∕(MS3_N*MS3_F)=1.00mm ⁻¹ .

In the optical lens group of the first embodiment, when the optical lens group is 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 first The overall focal length of the lens group G1 is f_G1, and the following condition is satisfied: MS3_F∕f_G1=0.004.

In the optical lens group of the first embodiment, when the optical lens group is 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 second The distance on the optical axis 195 from the eye side surface of the lens closest to the eye side in the 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 conditions are met: MS3_N∕ GCT2=2.84.

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 first lens group G1 is R1, the overall focal length of the optical lens group at the near point is EFL_N, and the optical lens group at the far point The overall focal length at the point is EFL_F, and the following condition is satisfied: R1∕(EFL_N*EFL_F)=1.06mm ⁻¹ .

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, 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 the following conditions are satisfied: EFL_F/R1=0.03.

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 surface 191 on the optical axis 195 is TL, and the entirety of the optical lens group at the near point The focal length is EFL_N, and the following condition is satisfied: TL/EFL_N=0.82.

In the optical lens group of the first embodiment, 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 are on the optical axis 195 The distance is GCT1, 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 satisfy the following condition: GCT2/GCT1=1.57.

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 image source side surface of the lens closest to the image source side in the second lens group G2 The radius of curvature is R4, and the following conditions are met: R4∕R3=-0.27.

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 whole of the second lens group G2 The focal length is f_G2, and the following condition is satisfied: MS2/f_G2=0.12.

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, and when the optical lens group is at the far point, the image source side surface of the lens closest to the image source side in the first lens group reaches the second The distance between the eye side surface of the lens closest to the eye side in the lens group on the optical axis 195 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.

Moreover, the optical lens group of the first embodiment uses the penetration and reflection of light to divide the optical path through the combined configuration of the absorbing polarizer, the reflective polarizer, the phase delay element, and the lens without affecting the imaging quality. Folded to compress the length of the optics required for imaging. Please refer to FIG. 1D , the linearly polarized incident light emitted by the image source 193 travels along the optical path L1 to the eyes of the user. Specifically, when the linearly polarized incident light passes through the second phase delay element 180, it changes from a linearly polarized state to a circularly polarized state, and the circularly polarized incident light will be transmitted by the lens located on the side closest to the image source in the second lens group G2. Part of the reflective and partially transmissive element 170 at the image source side surface splits light, so that a part of the incident light will pass through the partially reflective and partially transmissive element 170 and the second lens group G2 as transmitted light, and enter the first group P1; when traveling When the transmitted light to the first group P1 passes through the first phase delay element 123, it will be converted from a circularly polarized state to a linearly polarized state, and has a polarization direction parallel to the reflection axis of the reflective polarizer 122; then, the linearly polarized The transmitted light will be reflected by the reflective polarizer 122 to pass through the first phase delay element 123 to return from the linear polarization state to the circular polarization state; then, the transmitted light returning to the circular polarization state will pass through the second group P2 After the second lens group G2, a part of it will be reflected by the partially reflective and partially transmissive element 170 as reflected light, so as to pass through the second lens group G2 and travel to the first group P1; When the light passes through the first phase delay element 123, it will change from a circularly polarized state to a linearly polarized state, and has a polarization direction perpendicular to the reflection axis of the reflective polarizer 122; finally, the linearly polarized reflected light passes through the reflective The polarizing element 122 and the absorbing polarizing element 121 are then refracted to the eyes of the user by the lens of the first lens group G1 that is closer to the eye side than the absorbing polarizing element 121 .

Then refer to Table 3 and Table 4 below.

table 3 first embodiment Far point: EFL_F (overall focal length) = 35.31mm, EPD (entrance pupil diameter) = 8.00mm, FOV_F (viewing angle) = 94.8 degrees Near point: EFL_N (overall focal length) = 31.26mm, EPD (entrance pupil diameter) = 8.00mm, FOV_N (viewing angle) = 123.0 degrees surface radius of curvature Thickness/Gap Refractive index (nd) Dispersion coefficient (vd) focal length 0 unlimited -10000.000 (Further) – – – -111.000 (near-point) 1 aperture unlimited 12.000 – – – 2 first lens 1167.381 4.472 1.544 55.9 2138.93 3 Absorptive polarizer unlimited 0.100 1.533 56.0 – 4 reflective polarizer unlimited 0.100 1.533 56.0 – 5 first phase delay element unlimited 0.100 1.533 56.0 – 6 unlimited 11.845 (Further) – – – 0.767 (near-point) 7 second lens 449.808 7.012 1.544 55.9 – 8 Partially Reflective Partially Transmissive Elements -121.388 -7.012 mirror – 9 449.808 -11.845 (Further) – – – -0.767 (near-point) 10 first phase delay element unlimited -0.100 1.533 56.0 – 11 reflective polarizer unlimited -0.100 1.533 56.0 – 12 unlimited 0.100 mirror – 13 first phase delay element unlimited 0.100 1.533 56.0 – 14 unlimited 11.845 (Further) – – – 0.767 (near-point) 15 second lens 449.808 7.012 1.544 55.9 175.91 16 Partially Reflective Partially Transmissive Elements -121.388 1.750 (Further) – – – 12.828 (near-point) 17 second phase delay element unlimited 0.100 1.533 56.0 – 18 image source surface unlimited – – – – Note: The reference wavelength is 555nm.

Table 4 surface 2 3 7 9 15 8 16 K: 9.0000E+01 0.0000E+00 0.0000E+00 -3.8395E+00 A4: 3.0578E-06 0.0000E+00 1.2579E-06 8.0748E-08 A6: 1.7668E-09 0.0000E+00 -1.9721E-10 3.8187E-10 A8: -7.8251E-12 0.0000E+00 -1.9500E-13 -2.1540E-13 A10: 7.2622E-16 0.0000E+00 -8.1799E-17 -7.8410E-18 A12: 2.1462E-17 0.0000E+00 -3.0636E-20 -1.8863E-20 A14: -2.7772E-20 0.0000E+00 -2.8039E-23 -2.3056E-23 A16: 1.0795E-23 0.0000E+00 -5.4014E-26 -1.8914E-26 A18: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A20: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

Table 3 shows the detailed structural data of the first embodiment. The units of the radius of curvature, thickness, gap and focal length are mm, and the surfaces 18~0 respectively represent the surfaces that the light passes through sequentially from the image source surface 191 to the aperture 100, where: Surface 0 is the gap on the optical axis 195 between the user's eye (or aperture 100 ) and the imaging, and the imaging position is farther away from the eye side than the image source surface 191; Surface 1 is the gap between the aperture 100 and the first lens 110 on the optical axis The gap on 195; surfaces 2, 3 and 17 are the thicknesses of the first lens 110, the absorbing polarizer 121 and the second phase delay element 180 on the optical axis 195; surfaces 4, 11 and 12 are the reflective polarizer 122 The thickness on the optical axis 195; surfaces 5, 10 and 13 are the thicknesses of the first phase retardation element 123 on the optical axis 195; surface 6 is on the optical axis 195 between the first phase retardation element 123 and the second lens 130 Surfaces 7 and 15 are the thickness of the second lens 130 on the optical axis 195; Surfaces 8 and 16 are the thicknesses of the partially reflective and partially transmissive element 170 on the optical axis 195; The gap on the optical axis 195 between a phase delay element 123; the surface 14 is the gap on the optical axis 195 between the first phase delay element 123 and the second lens 130; Light reflection propagation.

Table 4 is the aspheric surface data in the first embodiment, wherein: k is the cone coefficient in the aspheric surface curve equation, and A4, A6, A8, A10, A12, A14, A16, A18 and A20 are high-order aspheric surface coefficients.

In addition, the tables of the following embodiments are schematic diagrams corresponding to the respective embodiments, and the definitions of the data in the tables are the same as those in Table 1 to Table 4 of the first embodiment, and will not be repeated here. Moreover, in each embodiment, the maximum effective radius of any surface of a lens is usually the intersection point of the light rays of the incident light at the maximum viewing angle of the optical lens group passing through the outermost edge of the entrance pupil on the surface of the lens, and the perpendicular distance between the intersection point and the optical axis The distance, or the radius of the part where the lens surface does not have surface treatment (the lens surface has a concave-convex structure, or ink, etc.), or the radius of the part where light can pass through the lens (shading sheet, or spacer ring etc. can block light from passing through the lens), but is not limited thereto.

<Second embodiment>

Please refer to the optical lens group shown in Figure 2A to Figure 2B, wherein Figure 2A is a schematic diagram of the optical lens group of the second embodiment of the present invention at the near point, and Figure 2B is a schematic diagram of the optical lens group of the second embodiment of the present invention at the far point Schematic diagram of the point. The optical lens group sequentially includes a first group P1 , a second group P2 and a third group P3 along the optical axis 295 from the eye side to the image source side. During the focusing (or zooming) process, 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.

The first group P1 includes an aperture 200 , a first lens group G1 (ie, a first lens 210 ) and an optical element 220 . The position of the aperture 200 can be the position where the user's eyes watch the image. The first lens 210 is located between the aperture 200 and the optical element 220 . The second group P2 includes a second lens group G2 (that is, a second lens 230 ) with positive refractive power and a part of reflective part of transmissive element 270 sequentially from the eye side to the image source side. The third group P3 includes a second phase delay element 280 and an image source surface 291 sequentially from the eye side to the image source side. The total number of lenses with refractive power in the optical lens group is two, but not limited thereto. The optical lens group can be used with an image source 293 , the image source surface 291 can be located on the image source 293 , and the type of the image source 293 can be a liquid crystal display, an OLED display or an LED display, but not limited thereto.

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

The optical element 220 includes an absorbing polarizer, a reflective polarizer and a first phase retardation element in sequence from the eye side to the image source side. The arrangement of these three elements can refer to the absorbing polarizer in the first embodiment. 121 , the configuration of the reflective polarizing element 122 and the first phase delay element 123 will not be repeated here.

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

The partially reflective and partially transmissive element 270 is disposed (such as but not limited to a coating) on the image source side surface 232 and has an average light reflectance of at least 30% in the visible light range, preferably an average light reflectance of 50%. The average light reflectance here refers to the average value of the reflectance of the partially reflective and partially transmissive element 270 for different wavelengths of light.

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.

Please refer to Table 5 to Table 8 below together.

table 5 second embodiment Far point: EFL_F (overall focal length) = 35.54mm, EPD (entrance pupil diameter) = 8.00mm, FOV_F (viewing angle) = 93.8 degrees Near point: EFL_N (overall focal length) = 33.09mm, EPD (entrance pupil diameter) = 8.00mm, FOV_N (viewing angle) = 110.1 degrees surface radius of curvature Thickness/Gap Refractive index (nd) Dispersion coefficient (vd) focal length 0 unlimited -10000.000 (Further) – – – -167.000 (near-point) 1 aperture unlimited 14.000 – – – 2 first lens 109.759 8.000 1.544 55.9 201.11 3 Absorptive polarizer unlimited 0.100 1.533 56.0 – 4 reflective polarizer unlimited 0.100 1.533 56.0 – 5 first phase delay element unlimited 0.100 1.533 56.0 – 6 unlimited 9.903 (Further) – – – 3.391 (near-point) 7 second lens -274.000 7.667 1.544 55.9 – 8 Partially Reflective Partially Transmissive Elements -105.338 -7.667 mirror – 9 -274.000 -9.903 (Further) – – – -3.391 (near-point) 10 first phase delay element unlimited -0.100 1.533 56.0 – 11 reflective polarizer unlimited -0.100 1.533 56.0 – 12 unlimited 0.100 mirror – 13 first phase delay element unlimited 0.100 1.533 56.0 – 14 unlimited 9.903 (Further) – – – 3.391 (near-point) 15 second lens -274.000 7.667 1.544 55.9 308.60 16 -105.338 1.300 (Further) – – – 7.812 (near-point) 17 second phase delay element unlimited 0.100 1.533 56.0 – 18 image source surface unlimited – – – – Note: The reference wavelength is 555nm.

Table 6 surface 2 3 7 9 15 8 16 K: -3.7944E-01 0.0000E+00 0.0000E+00 -4.6402E-01 A4: 1.0923E-06 0.0000E+00 0.0000E+00 -1.1662E-07 A6: 3.3035E-09 0.0000E+00 0.0000E+00 4.7147E-10 A8: -8.5443E-12 0.0000E+00 0.0000E+00 -3.1806E-13 A10: -7.7605E-17 0.0000E+00 0.0000E+00 1.1838E-16 A12: 2.2334E-17 0.0000E+00 0.0000E+00 1.3173E-20 A14: -2.6383E-20 0.0000E+00 0.0000E+00 6.6053E-23 A16: 9.3886E-24 0.0000E+00 0.0000E+00 -5.7370E-26 A18: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A20: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

Table 7 EFL_N(mm) 33.09 MS3_N(mm) 15.58 EFL_F(mm) 35.54 MS3_F(mm) 9.07 F_G1(mm) 201.11 MS2(mm) 19.27 F_G2(mm) 308.60 R1(mm) 109.76 T12_N(mm) 3.69 R2(mm) unlimited T12_F(mm) 10.20 R3(mm) -274.00 FOV_N (degrees) 110.1 R4(mm) -105.34 FOV_F (degrees) 93.8 TL(mm) 27.27 GCT1(mm) 8.00 IMH(mm) 26.94 GCT2(mm) 7.67 – –

Table 8 f_G2/f_G1 1.53 R1/(EFL_N*EFL_F)[mm ^-1 ] 0.09 EFL_N*TL/(EFL_F*IMH) 0.94 EFL_F/R1 0.32 MS2/EFL_F 0.54 TL/EFL_N 0.82 (T12_F–T12_N)/EFL_N 0.20 GCT2/GCT1 0.96 GCT1/(MS2) 0.42 R4/R3 0.38 f_G2/(MS3_N*MS3_F)[mm ^-1 ] 2.18 MS2/f_G2 0.06 MS3_F/f_G1 0.05 FOV_F/(T12_F*IMH) 0.34 MS3_N/GCT2 2.03 – –

In the second embodiment, the curve equation of the aspheric surface is the same as the curve equation of the aspheric surface of the first embodiment, the numerical value of each parameter in Table 7 can be deduced by Table 5 and Table 6, and the numerical value of each conditional formula in Table 8 can be obtained by Calculated from Table 7.

<Third embodiment>

Please refer to an optical lens group shown in FIG. 3A to FIG. 3B, wherein FIG. 3A is a schematic diagram of the optical lens group of the third embodiment of the present invention at near point, and FIG. 3B is a schematic diagram of the optical lens group of the third embodiment of the present invention at the near point. Schematic diagram of the far point. The optical lens group sequentially includes a first group P1 , a second group P2 and a third group P3 along the optical axis 395 from the eye side to the image source side. During the focusing (or zooming) process, 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.

The first group P1 includes an aperture 300 , a first lens group G1 (ie, a first lens 310 ) and an optical element 320 . The position of the aperture 300 can be the position where the user's eyes watch the image. The first lens 310 is located between the aperture 300 and the optical element 320 . The second group P2 includes a second lens group G2 (that is, a second lens 330 ) and a part of reflective part of transmissive element 370 in order from the eye side to the image source side and includes a second lens group G2 with positive refractive power. The third group P3 includes a second phase delay element 380 and an image source surface 391 sequentially from the eye side to the image source side. The total number of lenses with refractive power in the optical lens group is two, but not limited thereto. The optical lens group can be used with an image source 393 , the image source surface 391 can be located on the image source 393 , and the type of the image source 393 can be a liquid crystal display, an OLED display or an LED display, but not limited thereto.

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

The optical element 320 includes an absorbing polarizer, a reflective polarizer, and a first phase retardation element in sequence from the eye side to the image source side. The configuration of these three elements can refer to the absorbing polarizer in the first embodiment. 121 , the configuration of the reflective polarizing element 122 and the first phase delay element 123 will not be repeated here.

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

The partially reflective and partially transmissive element 370 is disposed (such as but not limited to a coating) on the image source side surface 332 and has an average light reflectance of at least 30% in the visible light range, preferably an average light reflectance of 50%. The average light reflectance here refers to the average value of the reflectance of the partially reflective and partially transmissive element 370 for different wavelengths of light.

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.

Please refer to Table 9 to Table 12 below together.

Table 9 third embodiment Far point: EFL_F (overall focal length) = 18.04mm, EPD (entrance pupil diameter) = 8.00mm, FOV_F (viewing angle) = 96.6 degrees Near point: EFL_N (overall focal length) = 16.71mm, EPD (entrance pupil diameter) = 8.00mm, FOV_N (viewing angle) = 99.7 degrees surface radius of curvature Thickness/Gap Refractive index (nd) Dispersion coefficient (vd) focal length 0 unlimited -10000.000 (Further) – – – -125.000 (near-point) 1 aperture unlimited 12.000 – – – 2 first lens 64.126 4.998 1.544 55.9 117.49 3 Absorptive polarizer unlimited 0.100 1.533 56.0 – 4 reflective polarizer unlimited 0.100 1.533 56.0 – 5 first phase delay element unlimited 0.100 1.533 56.0 – 6 unlimited 2.859 (Further) – – – 0.150 (near-point) 7 second lens 229.560 7.211 1.544 55.9 – 8 Partially Reflective Partially Transmissive Elements -65.901 -7.211 mirror – 9 229.560 -2.859 (Further) – – – -0.150 (near-point) 10 first phase delay element unlimited -0.100 1.533 56.0 – 11 reflective polarizer unlimited -0.100 1.533 56.0 – 12 unlimited 0.100 mirror – 13 first phase delay element unlimited 0.100 1.533 56.0 – 14 unlimited 2.859 (Further) – – – 0.150 (near-point) 15 second lens 229.560 7.211 1.544 55.9 94.63 16 -65.901 0.690 (Further) – – – 3.399 (near-point) 17 second phase delay element unlimited 0.100 1.533 56.0 – 18 image source surface unlimited – – – – Note: The reference wavelength is 555nm.

Table 10 surface 2 3 7 9 15 8 16 K: 5.0575E+00 0.0000E+00 0.0000E+00 2.6852E+00 A4: -9.1408E-06 0.0000E+00 3.9725E-07 1.2669E-06 A6: 4.5323E-08 0.0000E+00 -6.3122E-09 2.3658E-09 A8: -1.3818E-10 0.0000E+00 8.2972E-13 -2.7864E-12 A10: -2.3710E-13 0.0000E+00 8.9865E-15 -1.5197E-16 A12: 2.1300E-15 0.0000E+00 1.0857E-17 3.4968E-18 A14: -4.5001E-18 0.0000E+00 -2.0725E-20 5.0938E-21 A16: 3.1581E-21 0.0000E+00 0.0000E+00 -8.1518E-24 A18: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A20: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

Table 11 EFL_N(mm) 16.71 MS3_N(mm) 10.71 EFL_F(mm) 18.04 MS3_F(mm) 8.00 F_G1(mm) 117.49 MS2(mm) 11.16 F_G2(mm) 94.63 R1(mm) 64.13 T12_N(mm) 0.45 R2(mm) unlimited T12_F(mm) 3.16 R3(mm) 229.56 FOV_N (degrees) 99.7 R4(mm) -65.90 FOV_F (degrees) 96.6 TL(mm) 16.16 GCT1(mm) 5.00 IMH(mm) 13.47 GCT2(mm) 7.21 – –

Table 12 f_G2/f_G1 0.81 R1/(EFL_N*EFL_F)[mm ^-1 ] 0.21 EFL_N*TL/(EFL_F*IMH) 1.11 EFL_F/R1 0.28 MS2/EFL_F 0.62 TL/EFL_N 0.97 (T12_F–T12_N)/EFL_N 0.16 GCT2/GCT1 1.44 GCT1/(MS2) 0.45 R4/R3 -0.29 f_G2/(MS3_N*MS3_F)[mm ^-1 ] 1.10 MS2/f_G2 0.12 MS3_F/f_G1 0.07 FOV_F/(T12_F*IMH) 2.27 MS3_N/GCT2 1.49 – –

In the third embodiment, the curve equation of the aspheric surface is the same as the curve equation of the aspheric surface of the first embodiment, the numerical value of each parameter in Table 11 can be deduced by Table 9 and Table 10, and the numerical value of each conditional formula in Table 12 can be obtained by Calculated from Table 11.

<Fourth embodiment>

Please refer to an optical lens group shown in FIG. 4A to FIG. 4B, wherein FIG. 4A is a schematic diagram of the optical lens group of the fourth embodiment of the present invention at the near point, and FIG. 4B is a schematic diagram of the optical lens group of the fourth embodiment of the present invention at the near point. Schematic diagram of the far point. The optical lens group sequentially includes a first group P1 , a second group P2 and a third group P3 along the optical axis 495 from the eye side to the image source side. During the focusing (or zooming) process, 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.

The first group P1 includes an aperture 400 , a first lens group G1 (ie, a first lens 410 ) and an optical element 420 . The position of the aperture 400 can be the position where the user's eyes watch the image. The first lens 410 is located between the aperture 400 and the optical element 420 . The second group P2 includes a second lens group G2 with positive refractive power and a part of the reflective part of the transmissive element 470 sequentially from the eye side to the image source side. The second lens group G2 includes a second lens 430 and a third lens 440 sequentially from the eye side to the image source side. The third group P3 includes a second phase delay element 480 and an image source surface 491 sequentially from the eye side to the image source side. The total number of lenses with refractive power in the optical lens group is three, but not limited thereto. The optical lens group can be used with an image source 493 , the image source surface 491 can be located on the image source 493 , and the type of the image source 493 can be a liquid crystal display, an OLED display or an LED display, but not limited thereto.

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

The optical element 420 includes an absorbing polarizer, a reflective polarizer, and a first phase retardation element in sequence from the eye side to the image source side. The arrangement of these three elements can refer to the absorbing polarizer in the first embodiment. 121 , the configuration of the reflective polarizing element 122 and the first phase delay element 123 will not be repeated here.

The second lens 430 has positive refractive power, its eye side surface 431 is flat at the near optical axis, and its image source side surface 432 is convex at the near optical axis. The image source side surface 432 is aspherical.

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

The partially reflective and partially transmissive element 470 is disposed (such as but not limited to a coating) on the image source side surface 442 and has an average light reflectance of at least 30% in the visible light range, preferably an average light reflectance of 50%. The average light reflectance here refers to the average value of the reflectance of the partially reflective and partially transmissive element 470 for different wavelengths of light.

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.

Please refer to Table 13 to Table 16 below together.

Table 13 Fourth embodiment Far point: EFL_F (overall focal length) = 26.04mm, EPD (entrance pupil diameter) = 8.00mm, FOV_F (viewing angle) = 94.8 degrees Near point: EFL_N (overall focal length) = 24.50mm, EPD (entrance pupil diameter) = 8.00mm, FOV_N (viewing angle) = 100.9 degrees surface radius of curvature Thickness/Gap Refractive index (nd) Dispersion coefficient (vd) focal length 0 unlimited -10000.000 (Further) – – – -125.000 (near-point) 1 aperture unlimited 12.000 – – – 2 first lens 245.235 3.020 1.544 55.9 449.08 3 Absorptive polarizer unlimited 0.100 1.533 56.0 – 4 reflective polarizer unlimited 0.100 1.533 56.0 – 5 first phase delay element unlimited 0.100 1.533 56.0 – 6 unlimited 4.859 (Further) – – – 0.657 (near-point) 7 second lens unlimited 7.000 1.544 55.9 110.78 8 -60.492 1.004 – – – 9 third lens -62.914 2.010 1.661 20.4 -402.91 10 Partially Reflective Partially Transmissive Elements -83.164 -2.010 mirror – 11 -62.914 -1.004 – – – 12 second lens -60.492 -7.000 – – – 13 unlimited -4.859 (Further) – – – -0.657 (near-point) 14 first phase delay element unlimited -0.100 – – – 15 reflective polarizer unlimited -0.100 – – – 16 unlimited 0.100 mirror – 17 first phase delay element unlimited 0.100 – – – 18 unlimited 4.859 (Further) – – – 0.657 (near-point) 19 second lens unlimited 7.000 1.544 55.9 110.78 20 -60.492 1.004 – – – twenty one third lens -62.914 2.010 1.533 56.0 -402.91 twenty two -83.164 1.569 (Further) – – – 5.771 (near-point) twenty three second phase delay element unlimited 0.100 1.533 56.0 – twenty four image source surface unlimited – – – – Note: The reference wavelength is 555nm.

Table 14 surface 2 3 7 13 19 K: 0.0000E+00 0.0000E+00 0.0000E+00 A4: 1.1230E-06 0.0000E+00 0.0000E+00 A6: -5.7852E-10 0.0000E+00 0.0000E+00 A8: 3.3701E-12 0.0000E+00 0.0000E+00 A10: -5.5589E-15 0.0000E+00 0.0000E+00 A12: -4.0184E-17 0.0000E+00 0.0000E+00 A14: 3.6902E-20 0.0000E+00 0.0000E+00 A16: 9.3833E-23 0.0000E+00 0.0000E+00 A18: 0.0000E+00 0.0000E+00 0.0000E+00 A20: 0.0000E+00 0.0000E+00 0.0000E+00 surface 8 12 20 9 11 twenty one 10 twenty two K: 3.1396E-02 0.0000E+00 -5.5129E-01 A4: -2.2945E-08 0.0000E+00 -2.1583E-07 A6: -7.7592E-12 0.0000E+00 3.7854E-10 A8: -7.8501E-15 0.0000E+00 -2.3653E-13 A10: -1.1527E-18 0.0000E+00 3.2643E-16 A12: 3.9760E-20 0.0000E+00 -4.6249E-20 A14: 1.5060E-22 0.0000E+00 -9.4160E-22 A16: 4.0196E-25 0.0000E+00 9.5829E-25 A18: 0.0000E+00 0.0000E+00 0.0000E+00 A20: 0.0000E+00 0.0000E+00 0.0000E+00

Table 15 EFL_N(mm) 24.50 MS3_N(mm) 15.88 EFL_F(mm) 26.04 MS3_F(mm) 11.68 F_G1(mm) 449.08 MS2(mm) 16.84 F_G2(mm) 154.31 R1(mm) 245.24 T12_N(mm) 0.96 R2(mm) unlimited T12_F(mm) 5.16 R3(mm) unlimited FOV_N (degrees) 100.9 R4(mm) -83.16 FOV_F (degrees) 94.8 TL(mm) 19.86 GCT1(mm) 3.02 IMH(mm) 19.25 GCT2(mm) 10.01 – –

Table 16 f_G2/f_G1 0.34 R1/(EFL_N*EFL_F)[mm ^-1 ] 0.38 EFL_N*TL/(EFL_F*IMH) 0.97 EFL_F/R1 0.11 MS2/EFL_F 0.65 TL/EFL_N 0.81 (T12_F–T12_N)/EFL_N 0.17 GCT2/GCT1 3.32 GCT1/(MS2) 0.18 R4/R3 0 f_G2/(MS3_N*MS3_F)[mm ^-1 ] 0.83 MS2/f_G2 0.11 MS3_F/f_G1 0.03 FOV_F/(T12_F*IMH) 0.95 MS3_N/GCT2 1.59 – –

In the fourth embodiment, the curve equation of the aspheric surface is the same as the curve equation of the aspheric surface of the first embodiment, the values of the parameters in Table 15 can be deduced from Table 13 and Table 14, and the values of the conditional expressions in Table 16 can be calculated by Calculated from Table 15. In Table 13, the definitions of surfaces 0 to 7 are the same as the definitions of surfaces 0 to 7 in Table 2 of the first embodiment; surfaces 8 and 20 are the gaps on the optical axis 495 between the second lens 430 and the third lens 440 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 thickness between the partially reflective and partially transmissive element 470 and the second lens 430 The gap on the optical axis 495; Surfaces 12 and 19 are the thickness of the second lens 430 on the optical axis 495; Surfaces 13 and 18 are the gaps on the optical axis 495 between the second lens 430 and the first phase delay element ; Surfaces 14 and 17 are the thickness of the first phase retardation element on the optical axis 495; Surfaces 15 and 16 are the thickness of the reflective polarizer on the optical axis 495; Surface 22 is the third lens 440 and the second phase retardation element 480 The gap between them on the optical axis 495; the surface 23 is the thickness of the second phase delay element 480 on the optical axis 495; the values of the parameters in the table have a negative sign indicating light reflection propagation.

<Fifth Embodiment>

Please refer to an optical lens group shown in FIG. 5A to FIG. 5B, wherein FIG. 5A is a schematic diagram of the optical lens group of the fifth embodiment of the present invention at the near point, and FIG. 5B is a schematic diagram of the optical lens group of the fifth embodiment of the present invention at the near point. Schematic diagram of the far point. The optical lens group sequentially includes a first group P1 , a second group P2 and a third group P3 along the optical axis 595 from the eye side to the image source side. During the focusing (or zooming) process, 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.

The first group P1 includes an aperture 500 , a first lens group G1 and an optical element 520 . The position of the aperture 500 can be the position where the user's eyes watch the image. The first lens group G1 includes a first lens 510 and a second lens 530 in sequence from the eye side to the image source side, 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. between the second lenses 530 . The second group P2 includes a second lens group G2 (namely the third lens 540 ) with positive refractive power and a part of reflective part of transmissive element 570 in sequence from the eye side to the image source side. The third group P3 includes a second phase delay element 580 and an image source surface 591 sequentially from the eye side to the image source side. The total number of lenses with refractive power in the optical lens group is three, but not limited thereto. 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 , and the type of the image source 593 can be a liquid crystal display, an OLED display or an LED display, but not limited thereto.

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

The optical element 520 includes an absorbing polarizer, a reflective polarizer and a first phase retardation element in sequence from the eye side to the image source side. The arrangement of these three elements can refer to the absorbing polarizer in the first embodiment. 121 , the configuration of the reflective polarizing element 122 and the first phase delay element 123 will not be repeated here.

The second lens 530 has negative refractive power, its eye side surface 531 is flat at the near optical axis, and its image source side surface 532 is concave at the near optical axis. The image source side surface 532 is aspherical.

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

The partially reflective and partially transmissive element 570 is disposed (such as but not limited to a coating) on the image source side surface 542 and has an average light reflectance of at least 30% in the visible light range, preferably an average light reflectance of 50%. The average light reflectance here refers to the average value of the reflectance of the partially reflective and partially transmissive element 570 for different wavelengths of light.

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.

Please refer to Table 17 to Table 20 below together.

Table 17 fifth embodiment Far point: EFL_F (overall focal length) = 27.04mm, EPD (entrance pupil diameter) = 8.00mm, FOV_F (viewing angle) = 94.7 degrees Near point: EFL_N (overall focal length) = 25.83mm, EPD (entrance pupil diameter) = 8.00mm, FOV_N (viewing angle) = 101.9 degrees surface radius of curvature Thickness/Gap Refractive index (nd) Dispersion coefficient (vd) focal length 0 unlimited -10000.000 (Further) – – – -125.000 (near-point) 1 aperture unlimited 12.000 – – – 2 first lens 122.326 2.261 1.544 55.9 224.13 3 Absorptive polarizer unlimited 0.100 1.533 56.0 – 4 reflective polarizer unlimited 0.100 1.533 56.0 – 5 first phase delay element unlimited 0.100 1.533 56.0 – 6 second lens unlimited 2.000 1.661 20.4 -230.04 7 153.395 5.935 (Further) – – – 0.871 (near-point) 8 third lens 238.836 7.217 1.544 55.9 114.00 9 Partially Reflective Partially Transmissive Elements -83.239 -7.217 mirror – 10 238.836 -5.935 (Further) – – – -0.871 (near-point) 11 second lens 153.395 -2.000 – – – 12 first phase delay element unlimited -0.100 1.533 56.0 – 13 reflective polarizer unlimited -0.100 1.533 56.0 – 14 unlimited 0.100 mirror – 15 first phase delay element unlimited 0.100 – – – 16 second lens unlimited 2.000 1.661 20.4 -230.04 17 153.395 5.935 (Further) – – – 0.871 (near-point) 18 third lens 238.836 7.217 1.544 55.9 114.00 19 -83.239 1.390 (Further) – – – 6.454 (near-point) 20 second phase delay element unlimited 0.100 1.533 56.0 – twenty one image source surface unlimited – – – –

Table 18 surface 2 3 6 12 16 K: -1.0903E+01 0.0000E+00 0.0000E+00 A4: -7.1807E-06 0.0000E+00 0.0000E+00 A6: 1.2811E-07 0.0000E+00 0.0000E+00 A8: -7.7555E-10 0.0000E+00 0.0000E+00 A10: 2.2343E-12 0.0000E+00 0.0000E+00 A12: -3.1320E-15 0.0000E+00 0.0000E+00 A14: 1.2458E-18 0.0000E+00 0.0000E+00 A16: 8.8668E-22 0.0000E+00 0.0000E+00 A18: 0.0000E+00 0.0000E+00 0.0000E+00 A20: 0.0000E+00 0.0000E+00 0.0000E+00 surface 7 11 17 8 10 18 9 19 K: -8.2330E+00 5.3782E+01 -7.3329E-01 A4: 1.6938E-06 3.8261E-05 8.9536E-06 A6: -4.2538E-09 -2.3223E-07 -3.9345E-08 A8: 3.5756E-12 8.5235E-10 1.0529E-10 A10: -1.3779E-14 -1.9754E-12 -1.5297E-13 A12: -7.1277E-18 2.7291E-15 8.8430E-17 A14: 2.8191E-21 -2.1679E-18 -1.4002E-20 A16: 3.3863E-23 7.7177E-22 3.8020E-24 A18: 0.0000E+00 0.0000E+00 0.0000E+00 A20: 0.0000E+00 0.0000E+00 0.0000E+00

Table 19 EFL_N(mm) 25.83 MS3_N(mm) 13.67 EFL_F(mm) 27.04 MS3_F(mm) 8.61 F_G1(mm) 5815.29 MS2(mm) 14.54 F_G2(mm) 114.00 R1(mm) 122.33 T12_N(mm) 0.87 R2(mm) 153.39 T12_F(mm) 5.94 R3(mm) 238.84 FOV_N (degrees) 101.9 R4(mm) -83.24 FOV_F (degrees) 94.7 TL(mm) 19.10 GCT1(mm) 4.56 IMH(mm) 19.25 GCT2(mm) 7.22 – –

Table 20 f_G2/f_G1 0.02 R1/(EFL_N*EFL_F)[mm ^-1 ] 0.18 EFL_N*TL/(EFL_F*IMH) 0.95 EFL_F/R1 0.22 MS2/EFL_F 0.54 TL/EFL_N 0.74 (T12_F–T12_N)/EFL_N 0.20 GCT2/GCT1 1.58 GCT1/(MS2) 0.31 R4/R3 -0.35 f_G2/(MS3_N*MS3_F)[mm ^-1 ] 0.97 MS2/f_G2 0.13 MS3_F/f_G1 0.001 FOV_F/(T12_F*IMH) 0.83 MS3_N/GCT2 1.89 – –

In the fifth embodiment, the curve equation of the aspheric surface is the same as that of the first embodiment, the values of the parameters in Table 19 can be deduced from Table 17 and Table 18, and the values of the conditional expressions in Table 20 can be obtained from Calculated from Table 19. In Table 17, the definitions of surfaces 0 to 5 are the same as those of surfaces 0 to 5 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 second lenses 530 and the gap on the optical axis 595 between the third lens 540; surfaces 8 and 18 are the thicknesses of the third lens 540 on the optical axis 595; surfaces 9 and 20 are the partial reflection partial transmission element 570 and the second phase retardation element, respectively 580 is the thickness on the optical axis 595; surface 10 is the gap on the optical axis 595 between the partially reflective and partially transmissive element 570 and the second lens 530; surfaces 12 and 15 are the thicknesses of the first phase delay element on the optical axis 595 Surfaces 13 and 14 are the thickness of reflective polarizer on optical axis 595; Surface 19 is the gap on optical axis 595 between the third lens 540 and the second phase retardation element 580; The numerical value of the parameter in the table has negative The numbers represent light reflection propagation.

<Sixth embodiment>

Please refer to the optical lens group shown in Figures 6A and 6B, wherein Figure 6A is a schematic diagram of the optical lens group of the sixth embodiment of the present invention at the near point, and Figure 6B is a schematic diagram of the optical lens group of the sixth embodiment of the present invention at the far point time schematic diagram. The optical lens group sequentially includes a first group P1 , a second group P2 and a third group P3 along the optical axis 695 from the eye side to the image source side. During the focusing (or zooming) process, 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.

The first group P1 includes an aperture 600 , a first lens group G1 and an optical element 620 . The position of the aperture 600 can be the position where the user's eyes watch the image. The first lens group G1 includes a first lens 610 and a second lens 630 in sequence from the eye side to the image source side, the first lens 610 is located between the aperture 600 and the optical element 620, and the optical element 620 is located between the first lens 610 and the second lens 630. between the second lenses 630 . The second group P2 includes a second lens group G2 with positive refractive power and a part of reflective and partly transmissive elements 670 sequentially from the eye side to the image source side. The second lens group G2 includes a third lens 640 and a fourth lens 650 in sequence from the eye side to the image source side. The third group P3 includes a second phase delay element 680 and an image source surface 691 sequentially from the eye side to the image source side. The total number of lenses with refractive power in the optical lens group is four, but not limited thereto. The optical lens group can be used with an image source 693, the image source surface 691 can be located on the image source 693, and the type of the image source 693 can be a liquid crystal display, an OLED display or an LED display, but not limited thereto.

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

The optical element 620 sequentially includes an absorbing polarizer, a reflective polarizer and a first phase delay element from the eye side to the image source side. The arrangement of these three elements can refer to the absorbing polarizer in the first embodiment. 121 , the configuration of the reflective polarizing element 122 and the first phase delay element 123 will not be repeated here.

The second lens 630 has negative refractive power, its eye side surface 631 is flat at the near optical axis, and its image source side surface 632 is concave at the near optical axis. The image source side surface 632 is aspherical.

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

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

The partially reflective and partially transmissive element 670 is disposed (such as but not limited to a coating) on the image source side surface 652 and has an average light reflectance of at least 30% in the visible light range, preferably an average light reflectance of 50%. The average light reflectance here refers to the average value of the reflectance of the partially reflective and partially transmissive element 670 for different wavelengths of light.

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.

Please refer to Table 21 to Table 24 below together.

Table 21 Sixth embodiment Far point: EFL_F (overall focal length) = 30.03mm, EPD (entrance pupil diameter) = 10.00mm, FOV_F (viewing angle) = 93.3 degrees Near point: EFL_N (overall focal length) = 29.31mm, EPD (entrance pupil diameter) = 10.00mm, FOV_N (viewing angle) = 98.5 degrees surface radius of curvature Thickness/Gap Refractive index (nd) Dispersion coefficient (vd) focal length 0 unlimited -10000.000 (Further) – – – -143.000 (near-point) 1 aperture unlimited 12.000 – – – 2 first lens 433.607 2.000 1.544 55.9 794.48 3 Absorptive polarizer unlimited 0.100 1.533 56.0 – 4 reflective polarizer unlimited 0.100 1.533 56.0 – 5 first phase delay element unlimited 0.100 1.533 56.0 – 6 unlimited 0.200 – – – 7 second lens unlimited 2.000 1.661 20.4 -265.05 8 176.741 6.321 (Further) – – – 1.040 (near-point) 9 third lens 1121.061 2.648 1.544 55.9 – 10 188.480 0.500 – – – 11 fourth lens 170.613 6.152 1.544 55.9 – 12 Partially Reflective Partially Transmissive Elements -83.909 -6.152 mirror – 13 170.613 -0.500 – – – 14 third lens 188.480 -2.648 1.544 55.9 – 15 1121.061 -6.321 (Further) – – – -1.040 (near-point) 16 second lens 176.741 -2.000 1.661 20.4 – 17 unlimited -0.200 – – – 18 first phase delay element unlimited -0.100 1.533 56.0 – 19 reflective polarizer unlimited -0.100 1.533 56.0 – 20 unlimited 0.100 mirror – twenty one first phase delay element unlimited 0.100 1.533 56.0 – twenty two unlimited 0.200 – – – twenty three second lens unlimited 2.000 1.661 20.4 – twenty four 176.741 6.321 (Further) – – – 1.040 (near-point) 25 third lens 1121.061 2.648 1.544 55.9 -415.56 26 188.480 0.500 – – – 27 fourth lens 170.613 6.152 1.544 55.9 103.94 28 Partially Reflective Partially Transmissive Elements -83.909 0.720 (Further) – – – 6.001 (near-point) 29 second phase delay element unlimited 0.100 1.533 56.0 – 30 image source surface unlimited – – – –

Table 22 surface 2 3 7 17 twenty three 8 16 twenty four K: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A4: 3.7447E-07 0.0000E+00 0.0000E+00 -5.0537E-06 A6: 3.4493E-09 0.0000E+00 0.0000E+00 1.4419E-08 A8: -1.4576E-11 0.0000E+00 0.0000E+00 -2.4885E-11 A10: -2.1438E-14 0.0000E+00 0.0000E+00 9.5938E-15 A12: 5.8381E-17 0.0000E+00 0.0000E+00 7.5314E-18 A14: 0.0000E+00 0.0000E+00 0.0000E+00 -2.8811E-20 A16: 0.0000E+00 0.0000E+00 0.0000E+00 3.4772E-23 A18: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A20: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 surface 9 15 25 10 14 26 11 13 27 12 28 K: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A4: 8.5063E-06 -6.1739E-06 1.5157E-06 4.7173E-06 A6: -1.4120E-08 1.4620E-08 -1.6223E-09 -5.9674E-09 A8: -3.4920E-12 -2.7951E-11 -9.1529E-12 3. 1975E-12 A10: 6.4774E-15 7.9874E-15 -3.3008E-15 -4.2514E-15 A12: 2.9711E-18 1.1756E-17 1.2539E-18 -1.5384E-18 A14: -2.9960E-21 -6.1795E-21 1.4097E-21 2.9230E-21 A16: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A18: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A20: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

Table 23 EFL_N(mm) 29.31 MS3_N(mm) 15.40 EFL_F(mm) 30.03 MS3_F(mm) 10.12 F_G1(mm) -400.00 MS2(mm) 16.44 F_G2(mm) 137.36 R1(mm) 433.61 T12_N(mm) 1.04 R2(mm) 176.74 T12_F(mm) 6.32 R3(mm) 1121.06 FOV_N (degrees) 98.5 R4(mm) -83.91 FOV_F (degrees) 93.3 TL(mm) 20.94 GCT1(mm) 4.50 IMH(mm) 21.10 GCT2(mm) 9.30 – –

Table 24 f_G2/f_G1 -0.34 R1/(EFL_N*EFL_F)[mm ^-1 ] 0.49 EFL_N*TL/(EFL_F*IMH) 0.97 EFL_F/R1 0.07 MS2/EFL_F 0.55 TL/EFL_N 0.71 (T12_F–T12_N)/EFL_N 0.18 GCT2/GCT1 2.07 GCT1/(MS2) 0.27 R4/R3 -0.07 f_G2/(MS3_N*MS3_F)[mm ^-1 ] 0.88 MS2/f_G2 0.12 MS3_F/f_G1 -0.03 FOV_F/(T12_F*IMH) 0.70 MS3_N/GCT2 1.66 – –

In the sixth embodiment, the curve equation of the aspheric surface is the same as the curve equation of the aspheric surface of the first embodiment, the values of the parameters in Table 23 can be deduced from Table 21 and Table 22, and the values of the conditional expressions in Table 24 can be obtained from Calculated 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 on the optical axis 695 between the second lens 630 and the third lens 640; surface 9 , 14 and 25 are the thickness of the third lens 640 on the optical axis 695; Surfaces 10 and 26 are the gaps on the optical axis 695 between the third lens 640 and the fourth lens 650; Surfaces 11 and 27 are the fourth lens 650 Thickness on optical axis 695; surfaces 12 and 28 are thicknesses of partially reflective, partially transmissive element 670 on optical axis 695; surface 13 is gap on optical axis 695 between partially reflective, partially transmissive element 670 and third lens 640 ; Surfaces 16 and 23 are the thickness of the second lens 630 on the optical axis 695; Surfaces 17 and 22 are the gaps on the optical axis 695 between the second lens 630 and the first phase delay element; Surfaces 18 and 21 are the first The thickness of the phase delay element on the optical axis 695; surfaces 19 and 20 are the thicknesses of the reflective polarizer on the optical axis 695; surface 29 is the thickness of the second phase delay element 680 on the optical axis 695; the parameters in the table Values with a negative sign represent light reflection propagation.

<Seventh embodiment>

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

The first group P1 includes an aperture 700 , a first lens group G1 and an optical element 720 . The position of the aperture 700 can be the position where the user's eyes watch the image. The first lens group G1 includes a first lens 710, a second lens 730, and a third lens 740 in sequence from the eye side to the image source side, the first lens 710 is located between the aperture 700 and the optical element 720, and the optical element 720 Located between the first lens 710 and the second lens 730 . The second group P2 includes a second lens group G2 with positive refractive power (ie, the fourth lens 750 ) and a part of reflective and partly transmissive elements 770 in sequence from the eye side to the image source side. The third group P3 includes a second phase delay element 780 and an image source surface 791 sequentially from the eye side to the image source side. The total number of lenses with refractive power in the optical lens group is four, but not limited thereto. The optical lens group can be used with an image source 793, the image source surface 791 can be located on the image source 793, and the type of the image source 793 can be a liquid crystal display, an OLED display or an LED display, but not limited thereto.

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

The optical element 720 includes an absorbing polarizer, a reflective polarizer, and a first phase retardation element in sequence from the eye side to the image source side. The arrangement of these three elements can refer to the absorbing polarizer in the first embodiment. 121 , the configuration of the reflective polarizing element 122 and the first phase delay element 123 will not be repeated here.

The second lens 730 has negative refractive power, its eye side surface 731 is flat at the near optical axis, and its image source side surface 732 is concave at the near optical axis. The image source side surface 732 is aspherical.

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

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

The partially reflective and partially transmissive element 770 is disposed (such as but not limited to a coating) on the image source side surface 752, and has an average light reflectance of at least 30% in the visible light range, preferably an average light reflectance of 50%. The average light reflectance here refers to the average value of the reflectance of the partially reflective and partially transmissive element 770 for different wavelengths of light.

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.

Please refer to Table 25 to Table 28 below together.

Table 25 Seventh embodiment Far point: EFL_F (overall focal length) = 26.59mm, EPD (entrance pupil diameter) = 10.00mm, FOV_F (viewing angle) = 95.0 degrees Near point: EFL_N (overall focal length) = 25.73mm, EPD (entrance pupil diameter) = 10.00mm, FOV_N (viewing angle) = 100.0 degrees surface radius of curvature Thickness/Gap Refractive index (nd) Dispersion coefficient (vd) focal length 0 unlimited -10000.000 (Further) – – – -250.000 (near-point) 1 aperture unlimited 12.000 – – – 2 first lens 108.004 4.666 1.544 55.9 197.89 3 Absorptive polarizer unlimited 0.100 1.533 56.0 – 4 reflective polarizer unlimited 0.100 1.533 56.0 – 5 first phase delay element unlimited 0.100 1.533 56.0 – 6 unlimited 0.200 – – – 7 second lens unlimited 2.000 1.661 20.3 -236.62 8 157.784 0.500 – – – 9 third lens 280.029 2.433 1.544 55.9 2553.21 10 349.380 3.108 (Further) – – – 0.600 (near-point) 11 fourth lens 151.205 7.548 1.544 55.9 – 12 Partially Reflective Partially Transmissive Elements -89.350 -7.548 mirror – 13 151.205 -3.108 (Further) – – – -0.600 (near-point) 14 third lens 349.380 -2.433 1.544 55.9 – 15 280.029 -0.500 – – – 16 second lens 157.784 -2.000 1.661 20.4 – 17 unlimited -0.200 – – – 18 first phase delay element unlimited -0.100 1.533 56.0 – 19 reflective polarizer unlimited -0.100 1.533 56.0 – 20 unlimited 0.100 mirror – twenty one first phase delay element unlimited 0.100 1.533 56.0 – twenty two unlimited 0.200 – – – twenty three second lens unlimited 2.000 1.661 20.4 – twenty four 157.784 0.500 – – – 25 third lens 280.029 2.433 1.544 55.9 2553.21 26 349.380 -3.108 (Further) – – – -0.600 (near-point) 27 fourth lens 151.205 7.548 1.544 55.9 104.06 28 Partially Reflective Partially Transmissive Elements -89.350 1.100 (Further) – – – 3.608 (near-point) 29 second phase delay element unlimited 0.100 1.533 56.0 – 30 image source surface unlimited – – – –

Table 26 surface 2 3 7 17 twenty three 8 16 twenty four K: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A4: 3.1610E-06 0.0000E+00 0.0000E+00 4.8852E-06 A6: -3.4606E-09 0.0000E+00 0.0000E+00 -4.2538E-09 A8: 0.0000E+00 0.0000E+00 0.0000E+00 -4.7005E-12 A10: 0.0000E+00 0.0000E+00 0.0000E+00 5.8503E-15 A12: 0.0000E+00 0.0000E+00 0.0000E+00 -1.8649E-17 A14: 0.0000E+00 0.0000E+00 0.0000E+00 8.1727E-21 A16: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A18: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A20: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 surface 9 15 25 10 14 26 11 13 27 12 28 K: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A4: 7.9951E-06 7.7602E-07 9.3952E-06 2.9225E-06 A6: -6.1239E-09 1.9559E-09 -1.5651E-08 -1.1129E-09 A8: -3.0281E-12 -8.1537E-12 0.0000E+00 -2.8669E-12 A10: -2.4699E-15 9.1233E-15 0.0000E+00 -3.6267E-15 A12: 0.0000E+00 0.0000E+00 0.0000E+00 3.7316E-18 A14: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A16: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A18: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A20: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

Table 27 EFL_N(mm) 25.73 MS3_N(mm) 11.26 EFL_F(mm) 26.59 MS3_F(mm) 8.75 F_G1(mm) 762.02 MS2(mm) 11.86 F_G2(mm) 104.06 R1(mm) 108.00 T12_N(mm) 0.60 R2(mm) 349.38 T12_F(mm) 3.11 R3(mm) 151.21 FOV_N (degrees) 100.0 R4(mm) -89.35 FOV_F (degrees) 95.0 TL(mm) 21.96 GCT1(mm) 10.10 IMH(mm) 20.00 GCT2(mm) 7.55 – –

Table 28 f_G2/f_G1 0.14 R1/(EFL_N*EFL_F)[mm ^-1 ] 0.16 EFL_N*TL/(EFL_F*IMH) 1.06 EFL_F/R1 0.25 MS2/EFL_F 0.45 TL/EFL_N 0.85 (T12_F–T12_N)/EFL_N 0.10 GCT2/GCT1 0.75 GCT1/(MS2) 0.85 R4/R3 -0.59 f_G2/(MS3_N*MS3_F)[mm ^-1 ] 1.06 MS2/f_G2 0.11 MS3_F/f_G1 0.01 FOV_F/(T12_F*IMH) 1.53 MS3_N/GCT2 1.49 – –

In the seventh embodiment, the curve equation of the aspheric surface is the same as the curve equation of the aspheric surface of the first embodiment, the values of the parameters in Table 27 can be deduced from Table 25 and Table 26, and the values of the conditional expressions in Table 28 can be calculated by Calculated from Table 27. The definitions of surfaces 0-30 in Table 25 are the same as those of surfaces 0-30 in the sixth embodiment.

<Eighth embodiment>

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

The first group P1 includes an aperture 800 , a first lens group G1 (namely the first lens 810 ) and an optical element 820 . The position of the aperture 800 can be the position where the user's eyes watch the image. The first lens 810 is located between the aperture 800 and the optical element 820 . The second group P2 includes a second lens group G2 with positive refractive power and a part of reflective and partly transmissive elements 870 sequentially from the eye side to the image source side. The second lens group G2 includes a second lens 830 , a third lens 840 and a fourth lens 850 in sequence from the eye side to the image source side. The third group P3 includes a second phase delay element 880 and an image source surface 891 sequentially from the eye side to the image source side. The total number of lenses with refractive power in the optical lens group is four, but not limited thereto. The optical lens group can be used with an image source 893, the image source surface 891 can be located on the image source 893, and the type of the image source 893 can be a liquid crystal display, an OLED display or an LED display, but not limited thereto.

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

The optical element 820 includes an absorbing polarizer, a reflective polarizer, and a first phase retardation element in sequence from the eye side to the image source side. The arrangement of these three elements can refer to the absorbing polarizer in the first embodiment. 121 , the configuration of the reflective polarizing element 122 and the first phase delay element 123 will not be repeated here.

The second lens 830 has negative refractive power, its eye side surface 831 is flat at the near optical axis, and its image source side surface 832 is concave at the near optical axis. The image source side surface 832 is aspherical.

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

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

The partially reflective and partially transmissive element 870 is disposed (such as but not limited to a coating) on the image source side surface 852, and has an average light reflectance of at least 30% in the visible light range, preferably an average light reflectance of 50%. The average light reflectance here refers to the average value of the reflectance of the partially reflective and partially transmissive element 870 for different wavelengths of light.

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.

Please refer to Table 29 to Table 32 below together.

Table 29 Eighth embodiment Far point: EFL_F (overall focal length) = 26.66mm, EPD (entrance pupil diameter) = 10.00mm, FOV_F (viewing angle) = 95.0 degrees Near point: EFL_N (overall focal length) = 25.48mm, EPD (entrance pupil diameter) = 10.00mm, FOV_N (viewing angle) = 100.3 degrees surface radius of curvature Thickness/Gap Refractive index (nd) Dispersion coefficient (vd) focal length 0 unlimited -10000.000 (Further) – – – -250.000 (near-point) 1 aperture unlimited 12.000 – – – 2 first lens 135.896 4.000 1.544 55.9 248.99 3 Absorptive polarizer unlimited 0.100 1.533 56.0 – 4 reflective polarizer unlimited 0.100 1.533 56.0 – 5 first phase delay element unlimited 0.100 1.533 56.0 – 6 unlimited 2.963 (Further) – – – 0.300 (near-point) 7 second lens unlimited 1.800 1.661 20.3 -236.62 8 129.848 0.500 – – – 9 third lens 263.439 4.649 1.544 55.9 2553.21 10 -752.783 0.500 – – – 11 fourth lens 187.730 5.602 1.544 55.9 – 12 Partially Reflective Partially Transmissive Elements -91.924 -5.602 mirror – 13 187.730 -0.500 – – – 14 third lens -752.783 -4.649 1.544 55.9 – 15 263.439 -0.500 – – – 16 second lens 129.848 -1.800 1.661 20.4 – 17 unlimited -2.963 (Further) – – – -0.3 (near-point) 18 first phase delay element unlimited -0.100 1.533 56.0 – 19 reflective polarizer unlimited -0.100 1.533 56.0 – 20 unlimited 0.100 mirror – twenty one first phase delay element unlimited 0.100 1.533 56.0 – twenty two unlimited 2.963 (Further) – – – 0.300 (near-point) twenty three second lens unlimited 1.800 1.661 20.4 – twenty four 129.848 0.500 – – – 25 third lens 263.439 4.649 1.544 55.9 2553.21 26 -752.783 0.500 – – – 27 fourth lens 187.730 5.602 1.544 55.9 104.06 28 Partially Reflective Partially Transmissive Elements -91.924 1.100 (Further) – – – 3.763 (near-point) 29 second phase delay element unlimited 0.100 1.533 56.0 – 30 image source surface unlimited – – – –

Table 30 surface 2 3 7 17 twenty three 8 16 twenty four K: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A4: 1.9522E-06 0.0000E+00 0.0000E+00 -1.0252E-06 A6: -1.1557E-09 0.0000E+00 0.0000E+00 3.8933E-09 A8: 0.0000E+00 0.0000E+00 0.0000E+00 3.2503E-14 A10: 0.0000E+00 0.0000E+00 0.0000E+00 -1.6958E-16 A12: 0.0000E+00 0.0000E+00 0.0000E+00 -1.7513E-17 A14: 0.0000E+00 0.0000E+00 0.0000E+00 1.4066E-21 A16: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A18: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A20: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 surface 9 15 25 10 14 26 11 13 27 12 28 K: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A4: 6.1618E-06 1.1448E-06 1.7092E-06 1.8830E-06 A6: -8.6748E-09 -6.9143E-09 -8.9320E-09 -1.4188E-09 A8: 1.3988E-11 -1.1185E-11 0.0000E+00 2.3431E-12 A10: -1.6905E-14 2.3858E-14 0.0000E+00 -8.0578E-15 A12: 0.0000E+00 0.0000E+00 0.0000E+00 4.3251E-18 A14: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A16: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A18: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A20: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

Table 31 EFL_N(mm) 25.48 MS3_N(mm) 16.91 EFL_F(mm) 26.66 MS3_F(mm) 14.25 F_G1(mm) 248.99 MS2(mm) 17.51 F_G2(mm) 151.04 R1(mm) 135.90 T12_N(mm) 0.60 R2(mm) unlimited T12_F(mm) 3.26 R3(mm) unlimited FOV_N (degrees) 100.3 R4(mm) -91.92 FOV_F (degrees) 95.0 TL(mm) 21.51 GCT1(mm) 4.00 IMH(mm) 20.00 GCT2(mm) 13.05 – –

Table 32 f_G2/f_G1 0.61 R1/(EFL_N*EFL_F)[mm ^-1 ] 0.20 EFL_N*TL/(EFL_F*IMH) 1.03 EFL_F/R1 0.20 MS2/EFL_F 0.66 TL/EFL_N 0.84 (T12_F–T12_N)/EFL_N 0.10 GCT2/GCT1 3.26 GCT1/(MS2) 0.23 R4/R3 0.00 f_G2/(MS3_N*MS3_F)[mm ^-1 ] 0.63 MS2/f_G2 0.12 MS3_F/f_G1 0.06 FOV_F/(T12_F*IMH) 1.46 MS3_N/GCT2 1.30 – –

In the eighth embodiment, the curve equation of the aspheric surface is the same as the curve equation of the aspheric surface of the first embodiment, the values of the parameters in Table 31 can be deduced from Table 29 and Table 30, and the values of the conditional expressions in Table 32 can be calculated by Calculated from Table 31. The definitions of surfaces 0-30 in Table 29 are the same as those of surfaces 0-30 in the sixth embodiment.

In the optical lens group provided by the present invention, the lens material can be plastic or glass. When the lens material is plastic, the production cost can be effectively reduced, and when the lens material is glass, the degree of freedom in the configuration of the refractive power of the optical lens group can be increased. In addition, the aspheric lens surface in the optical lens group can be made into a shape other than a spherical surface to obtain more control variables and to reduce aberrations, thereby reducing the number of lenses used, so the optical lens group of the present invention can effectively reduce the of the total length.

In the optical lens group provided by the present invention, as far as the lens with refractive power is concerned, if the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at the near optical axis; if the lens surface is If it is a concave surface and the position of the concave surface is not defined, it means that the lens surface is concave at the near optical axis.

In addition, the optical lens group provided by the present invention can be applied to head-mounted electronic devices. Please refer to FIG. 9 which is a schematic diagram of a head-mounted electronic device according to an embodiment of the present invention. The head-mounted electronic device 9 is, for example but not limited to, a head-mounted display using virtual reality technology (Virtual Reality, VR), including a housing 910, an optical-mechanical module 920 and an image source disposed in the housing 910 930 and a controller 940.

The optomechanical modules 920 respectively correspond to the left eye and the right eye of the user. The optical-mechanical module 920 includes an optical lens group, and the optical lens group can be any one of the optical lens group in the first embodiment to the eighth embodiment.

The image source 930 can be the image source of any one of the first embodiment to the eighth embodiment. The image source 930 can correspond to the left eye and the right eye respectively, and the type of the image source 1003 can be a liquid crystal display, an LED display, or an OLED display, but is not limited thereto.

The controller 940 is electrically connected to the image source 930 to control the image source 930 to display images, so that the head-mounted electronic device 9 can project a stereoscopic image to the user's eyes to form a virtual image.

Although the present invention is disclosed above with the aforementioned embodiments, these embodiments are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, all changes, modifications and combinations of implementations are within the scope of patent protection of the present invention. For the scope of protection defined by the present invention, please refer to the appended scope of patent application.

100,200,300,400,500,600,700,800: Aperture 110,210,310,410,510,610,710,810: first lens 111,211,311,411,511,611,711,811: eye side surface 112,212,312,412,512,612,712,812: image source side surface 120,220,320,420,520,620,720,820: optical components 121:Absorptive polarizer 122: reflective polarizer 123: the first phase delay element 130,230,330,430,530,630,730,830: second lens 131,231,331,431,531,631,731,831: eye side surface 132,232,332,432,532,632,732,832: image source side surface 440,540,640,740,840: third lens 441,541,641,741,841: eye side surface 442,542,642,742,842: image source side surface 650,750,850: fourth lens 651,751,851: eye side surface 652,752,852: image source side surface 170,270,370,470,570,670,770,870: partially reflective and partially transmissive elements 180,280,380,480,580,680,780,880: the second phase delay element 191,291,391,491,591,691,791,891: image source plane 193,293,393,493,593,693,793,893: image source 195,295,395,495,595,695,795,895: optical axis 9: Head-mounted electronic device 910: shell 920: Opto-mechanical module 930: image source 940: controller T12_N: 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 when the optical lens group is at the near point T12_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 when the optical lens group is at the far point 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 to the image source surface MS3_N: The distance on the optical axis from the eye side surface of the lens closest to the eye side in the second lens group to the image source surface when the optical lens group is at the near point MS3_F: The distance on the optical axis from the surface on the eye side of the lens closest to the eye side in the second lens group to the image source surface when the optical lens group is at the far point IMH: the maximum image source height of the optical lens group TL: 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 surface L1: light path P1: The first group P2: the second group P3: The third group G1: The first lens group G2: Second lens group

Other aspects of the invention and its advantages will be discovered after studying the detailed description in conjunction with the following drawings: 1A is a schematic diagram of the optical lens group at the near point of the first embodiment of the present invention; 1B is a schematic diagram of the optical lens group at the far point of the first embodiment of the present invention; Figure 1C is a partially enlarged view of Figure 1A; 1D is a schematic diagram of parameters and optical paths of the optical lens group of the first embodiment of the present invention; 2A is a schematic diagram of the optical lens group at the near point of the second embodiment of the present invention; 2B is a schematic diagram of the optical lens group at the far point of the second embodiment of the present invention; 3A is a schematic diagram of the optical lens group at the near point of the third embodiment of the present invention; 3B is a schematic diagram of the optical lens group at the far point of the third embodiment of the present invention; 4A is a schematic diagram of the optical lens group at the near point of the fourth embodiment of the present invention; 4B is a schematic diagram of the optical lens group at the far point of the fourth embodiment of the present invention; 5A is a schematic diagram of the optical lens group at the near point of the fifth embodiment of the present invention; 5B is a schematic diagram of the optical lens group at the far point of the fifth embodiment of the present invention; 6A is a schematic diagram of the optical lens group at the near point of the sixth embodiment of the present invention; 6B is a schematic diagram of the optical lens group at the far point of the sixth embodiment of the present invention; 7A is a schematic diagram of the optical lens group at the near point of the seventh embodiment of the present invention; 7B is a schematic diagram of the optical lens group at the far point of the seventh embodiment of the present invention; 8A is a schematic diagram of the optical lens group at the near point of the eighth embodiment of the present invention; 8B is a schematic diagram of the optical lens group at the far point of the eighth embodiment of the present invention; and FIG. 9 is a schematic diagram of a head-mounted electronic device according to an embodiment of the present invention.

100: Aperture

110: first lens

111: eye side surface

112: image source side surface

120: Optical components

130: second lens

131: eye side surface

132: image source side surface

170: Partially reflective partly transmissive element

180: the second phase delay element

191: image source surface

193: Image source

195: optical axis

T12_N: 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 when the optical lens group is at the near point

MS3_N: The distance on the optical axis from the eye side surface of the lens closest to the eye side in the second lens group to the image source surface when the optical lens group is at the near point

P1: The first group

P2: the second group

P3: The third group

G1: The first lens group

G2: Second lens group

Claims (14)

An optical lens group has three groups, and the three groups sequentially include from the eye side to the image source side: a first group, including: a first lens group, including one, two or three lenses , the eye side surface of the lens closest to the eye side in the first lens group is a convex surface at the near optical axis; A polarizing element and a first phase delay element; a second group, which includes in sequence from the eye side to the image source side: a second lens group, with positive refractive power, including one, two or three lenses, the second The image source side surface of the lens closest to the image source side in the lens group is a convex surface at the near optical axis; and a part of the reflective part of the transmissive element; and a third group, the eye side to the image source side sequentially includes a second A phase delay element and an image source surface; wherein the total number of lenses with refractive power in the optical lens group is 2, 3 or 4, the overall focal length of the first lens group is f_G1, and the overall focal length of the second lens group is f_G2 , the overall focal length of the optical lens group at the near point is EFL_N, and the overall focal length of the optical lens group at the far point is EFL_F, from the eye side surface of the lens closest to the eye side to the image source in the first lens group The distance between the plane and the optical axis is TL, the maximum image source height of the optical lens group is IMH, and the image source side surface of the lens closest to the image source side in the first lens group is on the optical axis to the image source surface The distance is MS2, and the following conditions are met: -560.00mm<f_G1<8141.41mm, -0.48< f_G2/f_G1<2.15, 0.51<EFL_N*TL/(EFL_F*IMH)<1.56 and 0.27<MS2/EFL_F<0.92. The optical lens group according to claim 1, wherein the image source side surface of the lens closest to the image source side in the first lens group to the closest eye side in the second lens group when the optical lens group is at the far point The distance between the eye side surface of the lens on the optical axis is T12_F, and the distance from the image source side surface of the lens closest to the image source side in the first lens group to the second lens group when the optical lens group is at the near point The distance between the eye side surface of the lens closest to the eye side and the optical axis is T12_N, the overall focal length of the optical lens group at the near point is EFL_N, and the following conditions are met: 0.06<(T12_F-T12_N)/EFL_N<0.50 . According to the optical lens group described in claim 1, wherein the eye-side surface of the lens closest to the eye side in the first lens group is to the image source-side surface of the lens closest to the image source side in the first lens group The distance on the optical axis is GCT1, 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 conditions are satisfied: 0.11<GCT1/ MS2<1.19. According to the optical lens group described in claim 1, wherein the overall focal length of the second lens group is f_G2, when the optical lens group is at the near point, the eye side surface of the lens closest to the eye side in the second lens group is to the The distance from the image source surface on the optical axis is MS3_N, and the distance from the eye side surface of the lens closest to the eye side in the second lens group to the image source surface on the optical axis when the optical lens group is at the far point is MS3_F , and satisfy the following condition: 0.38mm ^-1 <f_G2/(MS3_N*MS3_F)<3.06mm ^-1 . According to the optical lens group described in claim 1, wherein when the optical lens group is at the far point, the eye side surface of the lens closest to the eye side in the second lens group is at the image source surface at The distance 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. The optical lens group according to claim 1, wherein the distance between the eye side surface of the lens closest to the eye side in the second lens group and the image source surface on the optical axis when the optical lens group is at the near point is MS3_N , the distance on the optical axis from the eye side surface of the lens closest to the eye side in the second lens group to the image source side surface of the lens closest to the image source side in the second lens group is GCT2, and satisfies the following Condition: 0.78<MS3_N/GCT2<3.98. According to the optical lens group described in claim 1, wherein the radius of curvature of the eye side surface of the lens closest to the eye side in the first lens group is R1, the overall focal length of the optical lens group at the near point is EFL_N, the The overall focal length of the optical lens group at the far point is EFL_F, and satisfies the following condition: 0.06mm ⁻¹ <R1/(EFL_N*EFL_F)<1.48mm ⁻¹ . According to the optical lens group described in claim 1, wherein 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 side in the first lens group is R1, and Satisfy the following condition: 0.02<EFL_F/R1<0.45. According to the optical lens group described in claim 1, the distance between the eye side surface of the lens closest to the eye side in the first lens group and the image source surface on the optical axis is TL, and the optical lens group is at the near point When the overall focal length is EFL_N, and satisfy the following conditions: 0.43<TL/EFL_N<1.35. According to the optical lens group described in claim 1, wherein the eye-side surface of the lens closest to the eye side in the first lens group is to the image source-side surface of the lens closest to the image source side in the first lens group The distance on the optical axis is GCT1, from the eye side surface of the lens closest to the eye side in the second lens group to the image source of the lens closest to the image source side in the second lens group The distance between the side surface and the optical axis is GCT2, and the following condition is satisfied: 0.45<GCT2/GCT1<4.64. According to the optical lens group described in claim 1, wherein the radius of curvature of the surface of the lens closest to the eye side in the second lens group is R3, and the radius of curvature of the lens closest to the image source side in the second lens group is The radius of curvature of the surface on the image source side is R4 and satisfies the following condition: -0.83<R4/R3<0.54. According to the optical lens group described in claim 1, wherein the distance between the image source side surface of the lens closest to the image source side in the first lens group and the image source surface on the optical axis is MS2, the second lens group The overall focal length of f_G2, and meet the following conditions: 0.04<MS2/f_G2<0.18. According to the optical lens group described in claim 1, wherein the maximum viewing angle of the optical lens group at the far point is FOV_F, the image of the lens closest to the image source side in the first lens group when the optical lens group is at the far point The distance on the optical axis from the source side surface to the eye side surface of the lens closest to the eye side in the second lens group is T12_F, the maximum image source height of the optical lens group is IMH, and the following conditions are met: 0.18<FOV_F /(T12_F*IMH)<3.18. A head-mounted electronic device, comprising: a casing; the optical lens group according to any one of Claims 1 to 13, disposed in the casing; an image source, disposed in the casing and configured on the optical lens The image source surface of the group; and a controller, which is arranged in the casing and electrically connected to the image source.

Images