TWM631118U - Optical lens set and head-mounted electronic device - Google Patents

Abstract

An optical lens group sequentially includes from the eye side to the image source side: a first lens with positive refractive power; the optical element includes an absorbing polarizing element, a reflective polarizing element and a first phase sequentially from the eye side to the image source side a retardation element; a second lens having a positive refractive power; a partially reflective and partially transmissive element; a second phase retardation element; and an image source surface. The total number of lenses with refractive power in the optical lens group is two. The overall focal length of the optical lens group is f, the maximum image source height of the optical lens group is IMH, the focal length of the first lens is f1, the focal length of the second lens is f2, and at least the following conditions are satisfied: 0.40<IMH∕ f<1.26; and 0.21<f2∕f1<2.35. And, a head-mounted electronic device has the optical lens group.

Description

Optical lens set and head-mounted electronic device

The present invention relates to an optical lens assembly and a head-mounted electronic device, especially an optical lens assembly that can be applied to the head-mounted electronic device.

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

Therefore, the purpose of this creation is to provide an optical lens assembly and a head-mounted electronic device. When the lens with refractive power in the optical lens assembly meets certain conditions, it can not only fold the optical path to reduce the weight of the device, but also ensure the imaging quality. .

In order to achieve the above purpose, an optical lens group provided by the present invention sequentially includes from the eye side to the image source side: a first lens with positive refractive power, and the eye-side surface of the first lens is convex at the near optical axis; An optical element including an absorbing polarizing element, a reflective polarizing element and a first phase retardation element in sequence from the eye side to the image source side; a second lens with positive refractive power, the image source of the second lens The side surface is convex at the near optical axis, and at least one of the eye side surface and the image source side surface of the second lens is an aspheric surface; a part of the reflection part is a transmission element; a second phase retardation element; and an image source surface .

Wherein, the overall focal length of the optical lens group is f, the maximum image source height of the optical lens group is IMH, the focal length of the first lens is f1, the focal length of the second lens is f2, and the following conditions are satisfied: 0.40<IMH ∕f<1.26; and 0.21<f2∕f1<2.35. Thereby, it helps to make the refractive power distribution of the optical lens group more appropriate, thereby reducing aberrations.

Optionally, the total number of lenses with refractive power in the optical lens group is two.

The thickness of the first lens on the optical axis is CT1, the thickness of the second lens on the optical axis is CT2, and the following conditions are satisfied: 0.62<CT2∕CT1<6.97. This helps to ensure that the thickness of the lens can meet the processing requirements of the lens manufacturing process on the premise of satisfying the imaging quality.

The thickness of the first lens on the optical axis is CT1, and the displacement from the intersection of the eye-side surface of the first lens on the optical axis to the position of the maximum effective radius of the eye-side surface of the first lens parallel to the optical axis is TDP1 , and satisfy the following conditions: 0.98<CT1∕TDP1<5.79. Thereby, it helps to achieve the best performance and the best assembly stability of the first lens.

The overall focal length of the optical lens group is f, the focal length of the first lens is f1, and the following conditions are satisfied: 0.04<f∕f1<0.28. Thereby, it is helpful to strengthen the wide-angle characteristic of the optical lens group, provide a larger viewing angle, and maintain the illuminance of the optical lens group.

The curvature radius of the eye-side surface of the first lens is R1, the focal length of the first lens is f1, and the following conditions are satisfied: 0.33<R1∕f1<0.76. Thereby, it is helpful to effectively improve the distortion of the optical lens group and reduce the aberration of the optical lens group, and further reduce the lens size.

The overall focal length of the optical lens group is f, the focal length of the second lens is f2, and the following conditions are satisfied: 0.07<f∕f2<0.30. Thereby, it is helpful to strengthen the wide-angle characteristic of the optical lens group, provide a larger viewing angle, and maintain the illuminance of the optical lens group.

The curvature radius of the image source side surface of the second lens is R4, the focal length of the second lens is f2, and the following conditions are satisfied: -1.20<R4∕f2<-0.22. Thereby, it is helpful to effectively reduce the image field curvature, improve the imaging quality of the optical lens group, and ensure the lens formability.

The distance from the eye-side surface of the first lens to the image source surface on the optical axis is TL, the curvature radius of the eye-side surface of the first lens is R1, and the following conditions are satisfied: 2.05<R1∕TL<12.83. This contributes to maintaining proper lens formability.

The Abbe number of the first lens is vd1, the Abbe number of the second lens is vd2, the refractive index of the first lens is nd1, and the following conditions are satisfied: 0.93<(vd1*nd1)∕vd2<2.16. In this way, it is helpful to make the first lens and the second lens have a more suitable material matching, so as to provide better imaging quality.

The curvature radius of the eye-side surface of the first lens is R1, and the curvature radius of the image source-side surface of the second lens is R4, and the following conditions are satisfied: -2.74<R1∕R4<-0.54. In this way, the two radii of curvature mutually restrict each other, which helps to prevent the radii of curvature from being too small and reduces the sensitivity to assembly tolerances.

The curvature radius of the eye-side surface of the second lens is R3, the curvature radius of the image source-side surface of the second lens is R4, and the following conditions are satisfied: -0.83<R4∕R3<0.49. In this way, the two radii of curvature mutually restrict each other, which helps to prevent the radii of curvature from being too small and reduces the sensitivity to assembly tolerances.

The distance on the optical axis from the eye-side surface of the second lens to the image source surface is T2M, the thickness of the second lens on the optical axis is CT2, and the following conditions are satisfied: 0.68<T2M∕CT2<2.37. This helps to achieve a more appropriate balance between the lens formability and the refractive power of the second lens.

The distance on the optical axis from the eye-side surface of the first lens to the image source surface is TL, the maximum image source height of the optical lens group is IMH, and the following conditions are satisfied: 0.54<TL∕IMH<1.80. Thereby, it is helpful to achieve a proper balance between the miniaturization of the optical lens group and the size of the light-emitting area of the image source surface.

The curvature radius of the image source side surface of the second lens is R4, the refractive index of the second lens is nd2, and the following conditions are satisfied: -116.45mm<R4∕nd2<-19.09mm. Thereby, it is helpful to achieve the best balance between the lens formability and performance of the optical lens group when the second lenses of different materials are selected.

Optionally, the image source side surface of the second lens is convex at the near optical axis.

Optionally, the partially reflective partially transmissive element has an average light reflectivity of at least 30% in the visible light range, preferably 50% average light reflectivity.

Optionally, the optical element further includes an anti-reflection film, and the anti-reflection film is closer to the image source side than the phase retardation element.

Optionally, the overall focal length of the optical lens group is f, and the following conditions are satisfied: 12.07mm<f<38.00mm.

Optionally, the maximum viewing angle of the optical lens group is FOV, and the following conditions are satisfied: 76.5 degrees<FOV<132.0 degrees.

Optionally, the distance from the eye-side surface of the first lens to the image source surface on the optical axis is TL, and satisfies the following condition: 10.39mm<TL<29.54mm.

Optionally, the maximum image source height of the optical lens group is IMH, and the following conditions are satisfied: 8.08mm<IMH<29.63mm.

In addition, the present invention also provides a head-mounted electronic device, comprising: a casing; an optical lens group disposed in the casing; an image source disposed in the casing and disposed in the image source of the optical lens group a surface; and a controller disposed in the casing and electrically connected to the image source. The optical lens group sequentially includes from the eye side to the image source side: a first lens with positive refractive power, the eye side surface of the first lens is convex at the near optical axis; an optical element from the eye side to the image The source side includes an absorbing polarizing element, a reflective polarizing element and a first phase retardation element in sequence; a second lens with positive refractive power, and the image source side surface of the second lens is convex at the near optical axis , at least one of the eye side surface and the image source side surface of the second lens is an aspheric surface; a part of the reflection part is a transmission element; a second phase retardation element; and an image source surface.

Wherein, the overall focal length of the optical lens group is f, the maximum image source height of the optical lens group is IMH, the focal length of the first lens is f1, the focal length of the second lens is f2, and the following conditions are satisfied: 0.40<IMH ∕f<1.26; and 0.21<f2∕f1<2.35. Thereby, it helps to make the refractive power distribution of the optical lens group more appropriate, thereby reducing aberrations.

Optionally, the total number of lenses with refractive power in the optical lens group is two.

The thickness of the first lens on the optical axis is CT1, the thickness of the second lens on the optical axis is CT2, and the following conditions are satisfied: 0.62<CT2∕CT1<6.97. This helps to ensure that the thickness of the lens can meet the processing requirements of the lens manufacturing process on the premise of satisfying the imaging quality.

The thickness of the first lens on the optical axis is CT1, and the displacement from the intersection of the eye-side surface of the first lens on the optical axis to the position of the maximum effective radius of the eye-side surface of the first lens parallel to the optical axis is TDP1 , and satisfy the following conditions: 0.98<CT1∕TDP1<5.79. Thereby, it helps to achieve the best performance and the best assembly stability of the first lens.

The overall focal length of the optical lens group is f, the focal length of the first lens is f1, and the following conditions are satisfied: 0.04<f∕f1<0.28. Thereby, it is helpful to strengthen the wide-angle characteristic of the optical lens group, provide a larger viewing angle, and maintain the illuminance of the optical lens group.

The curvature radius of the eye-side surface of the first lens is R1, the focal length of the first lens is f1, and the following conditions are satisfied: 0.33<R1∕f1<0.76. Thereby, it is helpful to effectively improve the distortion of the optical lens group and reduce the aberration of the optical lens group, and further reduce the lens size.

The overall focal length of the optical lens group is f, the focal length of the second lens is f2, and the following conditions are satisfied: 0.07<f∕f2<0.30. Thereby, it is helpful to strengthen the wide-angle characteristic of the optical lens group, provide a larger viewing angle, and maintain the illuminance of the optical lens group.

The curvature radius of the image source side surface of the second lens is R4, the focal length of the second lens is f2, and the following conditions are satisfied: -1.20<R4∕f2<-0.22. Thereby, it is helpful to effectively reduce the image field curvature, improve the imaging quality of the optical lens group, and ensure the lens formability.

The distance from the eye-side surface of the first lens to the image source surface on the optical axis is TL, the curvature radius of the eye-side surface of the first lens is R1, and the following conditions are satisfied: 2.05<R1∕TL<12.83. This contributes to maintaining proper lens formability.

The Abbe number of the first lens is vd1, the Abbe number of the second lens is vd2, the refractive index of the first lens is nd1, and the following conditions are satisfied: 0.93<(vd1*nd1)∕vd2<2.16. In this way, it is helpful to make the first lens and the second lens have a more suitable material matching, so as to provide better imaging quality.

The curvature radius of the eye-side surface of the first lens is R1, and the curvature radius of the image source-side surface of the second lens is R4, and the following conditions are satisfied: -2.74<R1∕R4<-0.54. In this way, the two radii of curvature mutually restrict each other, which helps to prevent the radii of curvature from being too small and reduces the sensitivity to assembly tolerances.

The curvature radius of the eye-side surface of the second lens is R3, the curvature radius of the image source-side surface of the second lens is R4, and the following conditions are satisfied: -0.83<R4∕R3<0.49. In this way, the two radii of curvature mutually restrict each other, which helps to prevent the radii of curvature from being too small and reduces the sensitivity to assembly tolerances.

The distance on the optical axis from the eye-side surface of the second lens to the image source surface is T2M, the thickness of the second lens on the optical axis is CT2, and the following conditions are satisfied: 0.68<T2M∕CT2<2.37. This helps to achieve a more appropriate balance between the lens formability and the refractive power of the second lens.

The distance on the optical axis from the eye-side surface of the first lens to the image source surface is TL, the maximum image source height of the optical lens group is IMH, and the following conditions are satisfied: 0.54<TL∕IMH<1.80. Thereby, it is helpful to achieve a proper balance between the miniaturization of the optical lens group and the size of the light-emitting area of the image source surface.

The curvature radius of the image source side surface of the second lens is R4, the refractive index of the second lens is nd2, and the following conditions are satisfied: -116.45<R4∕nd2<-19.09. Thereby, it is helpful to achieve the best balance between the lens formability and performance of the optical lens group when the second lenses of different materials are selected.

Optionally, the image source side surface of the second lens is convex at the near optical axis.

Optionally, the partially reflective partially transmissive element has an average light reflectivity of at least 30% in the visible light range, preferably 50% average light reflectivity.

Optionally, the optical element further includes an anti-reflection film, and the anti-reflection film is closer to the image source side than the phase retardation element.

Optionally, the overall focal length of the optical lens group is f, and the following conditions are satisfied: 12.07mm<f<38.00mm.

Optionally, the maximum viewing angle of the optical lens group is FOV, and the following conditions are satisfied: 76.5 degrees<FOV<132.0 degrees.

Optionally, the distance from the eye-side surface of the first lens to the image source surface on the optical axis is TL, and satisfies the following condition: 10.39mm<TL<29.54mm.

Optionally, the maximum image source height of the optical lens group is IMH, and the following conditions are satisfied: 8.08mm<IMH<29.63mm.

<First Embodiment>

Please refer to FIGS. 1A , 1B and 10 . FIG. 1A is a schematic diagram of an optical lens group according to a first embodiment of the present invention, FIG. 1B is a partial enlarged view of FIG. 1A , and FIG. 10 is a parameter according to the first embodiment of the present invention. and schematic diagram of the light path. The optical lens group includes an aperture 100, a first lens 110, an optical element 120, a second lens 130, a part of reflection and partial transmission element 140, and a second phase in sequence along the optical axis 180 from the eye side to the image source side Delay element 150 and an image source surface 160 . The total number of lenses with refractive power in the optical lens group is two, but not limited to this. The optical lens group can be used with an image source 170, and the image source surface 160 can be located on the image source 170. The type of the image source 170 can be a liquid crystal display, an OLED display or an LED display, but not limited to this, and the aperture 100 The position of can be the position where the user's eyes view the image.

The first lens 110 has positive refractive power, the eye-side surface 111 is convex at the near optical axis, the image source-side surface 112 is flat at the near optical axis, and 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 sequence from the eye side to the image source side. ) on the image source side surface 112 of the first lens 110, and the two opposite surfaces of these elements are both flat surfaces. Specifically, the absorbing polarizing element 121 is attached on the image source side surface 112 , the reflective polarizing element 122 is attached on the absorbing polarizing element 121 , and the first phase retardation element 123 is attached on the reflective polarizing element 122 . The first phase delay element 123 is, for example, but not limited to, a quarter wave plate.

The second lens 130 has a positive refractive power, the eye-side surface 131 is convex at the near optical axis, the image source-side surface 132 is convex at the near-optical axis, and the eye-side surface 131 is spherical, and the image source side surface 132 is an aspherical surface.

The partially reflective and partially transmissive element 140 is disposed (eg, but not limited to, a coating) on the image source side surface 132 of the second lens 130, and has an average light reflectivity of at least 30% in the visible light range, preferably an average of 50% light reflectivity. The average light reflectivity here refers to the average value of the reflectivity of the partially reflective and partially transmissive elements 140 for light of different wavelengths.

The second phase retardation element 150 is disposed between the partially reflective and partially transmissive element 140 and the image source surface 160 , and is close to the image source surface 160 . The second phase delay element 150 is, for example, but not limited to, a quarter wave plate.

其中z為沿光軸180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180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 along the optical axis 180 at a height of h with 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 of the lens surface near the optical axis; h is the vertical distance from the lens surface to the optical axis 180; k is the conic constant; Ai is the i-th order aspheric coefficient.

In the optical lens group of the first embodiment, the overall focal length of the optical lens group is f, the focal length of the first lens 110 is f1, the focal length of the second lens 130 is f2, the entrance pupil aperture of the optical lens group is EPD, and the optical lens group The aperture value (f-number) is Fno, the maximum viewing angle of the optical lens group is FOV, the thickness of the first lens 110 on the optical axis 180 is CT1, the thickness of the second lens 130 on the optical axis 180 is CT2, and the thickness of the second lens 130 on the optical axis 180 is CT2. The distance from the eye-side surface 131 of the lens 130 to the image source surface 160 on the optical axis 180 is T2M, the distance from the image source side surface 112 of the first lens 110 to the image source surface 160 on the optical axis 180 is T1M, the first lens The curvature radius of the eye side surface 111 of the first lens 110 is R1, the curvature radius of the image source side surface 112 of the first lens 110 is R2, the curvature radius of the eye side surface 131 of the second lens 130 is R3, and the image source of the second lens 130 The radius of curvature of the side surface 132 is R4, the refractive index of the first lens 110 is nd1, the refractive index of the second lens 130 is nd2, the Abbe number of the first lens 110 is vd1, and the Abbe number of the second lens 130 is vd2 , the distance from the eye-side surface 111 of the first lens 110 to the image source surface 160 on the optical axis 180 is TL, the maximum image source height of the optical lens group is IMH (usually the radius of the inscribed circle of the image source surface 160), The displacement of the intersection of the eye-side surface 111 of the first lens 110 on the optical axis 180 to the position of the maximum effective radius of the eye-side surface 111 of the first lens 110 parallel to the optical axis 180 is TDP1. The values of these parameters are shown in Table 1. show below.

Table 1 f(mm) 34.55 R2(mm) unlimited f1(mm) 315.91 R3(mm) 355.231 f2(mm) 173.64 R4(mm) -128.431 EPD(mm) 8.00 nd1 1.544 Fno 4.32 nd2 1.544 FOV (degrees) 95.0 vd1 55.9 CT1(mm) 5.209 vd2 55.9 CT2(mm) 6.403 TL(mm) 24.368 T2M(mm) 7.903 IMH(mm) 26.940 T1M(mm) 19.159 TDP1(mm) 1.259 R1(mm) 172.415 – –

In the optical lens group of the first embodiment, the overall focal length of the optical lens group is f, the maximum image source height of the optical lens group is IMH, and the following condition IMH∕f=0.78 is satisfied.

In the optical lens group of the first embodiment, the focal length of the first lens 110 is f1, the focal length of the second lens 130 is f2, and the following condition f2∕f1=0.55 is satisfied.

In the optical lens group of the first embodiment, the thickness of the first lens 110 on the optical axis 180 is CT1, the thickness of the second lens 130 on the optical axis 180 is CT2, and the following conditions CT2∕CT1=1.23 are satisfied.

In the optical lens group of the first embodiment, the thickness of the first lens 110 on the optical axis 180 is CT1, and the intersection of the eye-side surface 111 of the first lens 110 on the optical axis 180 reaches the eye-side surface 111 of the first lens 110 The displacement of the maximum effective radius position parallel to the optical axis 180 is TDP1, and satisfies the following condition CT1∕TDP1=4.14.

In the optical lens group of the first embodiment, the overall focal length of the optical lens group is f, the focal length of the first lens 110 is f1, and the following condition f∕f1=0.11 is satisfied.

In the optical lens group of the first embodiment, the curvature radius of the eye-side surface 111 of the first lens 110 is R1, the focal length of the first lens 110 is f1, and the following condition R1∕f1=0.55 is satisfied.

In the optical lens group of the first embodiment, the overall focal length of the optical lens group is f, the focal length of the second lens 130 is f2, and the following condition f∕f2=0.20 is satisfied.

In the optical lens group of the first embodiment, the curvature radius of the image source side surface 132 of the second lens 130 is R4, the focal length of the second lens 130 is f2, and the following conditions R4∕f2=-0.74 are satisfied.

In the optical lens group of the first embodiment, the distance from the eye-side surface 111 of the first lens 110 to the image source surface 160 on the optical axis 180 is TL, the curvature radius of the eye-side surface 111 of the first lens 110 is R1, and The following conditions R1∕TL=7.08 are satisfied.

In the optical lens group of the first embodiment, the Abbe number of the first lens 110 is vd1, the Abbe number of the second lens 130 is vd2, the refractive index of the first lens 110 is nd1, and the following conditions are satisfied (vd1*nd1 )∕vd2=1.54.

In the optical lens group of the first embodiment, the curvature radius of the eye-side surface 111 of the first lens 110 is R1, the curvature radius of the image source-side surface 132 of the second lens 130 is R4, and the following conditions R1∕R4=- 1.34.

In the optical lens group of the first embodiment, the curvature radius of the eye-side surface of the second lens 130 is R3, the curvature radius of the image source-side surface 132 of the second lens 130 is R4, and the following conditions R4∕R3=-0.36 are satisfied. .

In the optical lens group of the first embodiment, the distance from the eye-side surface of the second lens 130 to the image source surface 160 on the optical axis 180 is T2M, the thickness of the second lens 130 on the optical axis 180 is CT2, and satisfies the following: The condition T2M∕CT2=1.23.

In the optical lens group of the first embodiment, the distance from the eye-side surface 111 of the first lens 110 to the image source surface 160 on the optical axis 180 is TL, the maximum image source height of the optical lens group is IMH, and the following conditions TL are satisfied: ∕IMH=0.90.

In the optical lens group of the first embodiment, the radius of curvature of the image source side surface 132 of the second lens 130 is R4, the refractive index of the second lens 130 is nd2, and the following condition R4∕nd2=-83.18 is satisfied.

In addition, the optical lens group of the first embodiment is configured by a combination of an absorbing polarizing element, a reflective polarizing element, a phase retardation element and a lens, and on the premise of not affecting the imaging quality, the optical path is transformed by the penetration and reflection of light. Folded to compress the length of the lens set required for imaging. Referring to FIG. 10 , the linearly polarized incident light emitted by the image source 170 will travel along the light path L1 to the user's eyes. Specifically, when the linearly polarized incident light passes through the second phase retardation element 150, it is converted from a linearly polarized state to a circularly polarized state, and a part of the circularly polarized incident light passes through the partially reflective and partially transmissive element 140 as transmitted light and enters the The second lens 130 is refracted by the second lens 130 to the first phase retardation element 123 , the transmitted light is converted from a circular polarization state to a linear polarization state when passing through the first phase retardation element 123 for the first time, and has a reflective type The reflection axis of the polarizing element 122 is parallel to the polarization direction; then, the linearly polarized transmitted light will be reflected by the reflective polarizing element 122 to pass through the first phase retardation element 123 for the second time to be converted from the linearly polarized state to the circularly polarized state again Then, after passing through the second lens 130, a part of the transmitted light converted to the circularly polarized state will be reflected back to the second lens 130 by the partially reflecting and partially transmitting element 140 as reflected light, and will pass through the second lens 130 after passing through the second lens 130. Then proceed to the first phase retardation element 123; when the reflected light passes through the first phase retardation element 123, it will be converted from a circular polarization state to a linear polarization state, and has a polarization direction perpendicular to the reflection axis of the reflective polarizer element 122; finally , the linearly polarized reflected light will be refracted by the first lens 110 to the user's eyes after passing through the reflective polarizing element 122 and the absorbing polarizing element 121 .

Please refer to Table 2 and Table 3 below.

Table 2 first embodiment f (overall focal length) = 34.55mm, EPD (entrance pupil aperture) = 8.00mm, FOV (angle of view) = 95.0 degrees surface Radius of curvature Thickness/gap refractive index (nd) Dispersion Coefficient (vd) Effective Focal Length (EFL) 0 unlimited -2500.000 – – – 1 aperture unlimited 12.000 – – – 2 first lens 172.415 5.209 1.544 55.9 315.91 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 10.856 – – – 7 second lens 355.231 6.403 1.544 55.9 – 8 Partially Reflective Partially Transmissive Elements -128.431 -6.403 mirror – 9 355.231 -10.856 – – – 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 10.856 – – 15 second lens 355.231 6.403 1.544 55.9 173.64 16 -128.431 1.500 – – – 17 second phase delay element unlimited 0.100 1.533 56.0 – 18 image source surface unlimited – – – – Note: The reference wavelength is 555nm.

table 3 Aspheric coefficient surface 2 8 16 K: -1.1349E-01 -1.5392E+00 -1.5392E+00 A2: 0.0000E+00 0.0000E+00 0.0000E+00 A4: 2.5103E-06 3.9001E-08 3.9001E-08 A6: 1.3651E-09 2.5879E-10 2.5879E-10 A8: -7.3781E-12 -1.4892E-13 -1.4892E-13 A10: 1.0427E-15 4.2838E-17 4.2838E-17 A12: 2.1329E-17 3.3944E-20 3.3944E-20 A14: -2.8095E-20 7.4731E-24 7.4731E-24 A16: 1.0632E-23 -2.0824E-26 -2.0824E-26 A18: 0.0000E+00 0.0000E+00 0.0000E+00 A20: 0.0000E+00 0.0000E+00 0.0000E+00

Table 2 is the detailed structural data of the first embodiment, the units of curvature radius, thickness, gap and focal length are mm, and surfaces 18-0 respectively represent the surfaces that light passes through sequentially from the image source surface 160 to the aperture 100, wherein: Surface 0 is the gap on the optical axis 180 between the user's eye (or aperture 100 ) and the image, and the imaging position is farther from the eye side than the image source surface 160 ; Surface 1 is the gap between the aperture 100 and the first lens 110 on the optical axis Gap on 180; surfaces 2, 3 and 17 are the thicknesses of first lens 110, absorptive polarizer 121 and second retardation element 150 on optical axis 180, respectively; surfaces 4, 11 and 12 are reflective polarizer 122 Thickness on optical axis 180; surfaces 5, 10 and 13 are the thicknesses of first phase retardation element 123 on optical axis 180; surface 6 is between first phase retardation element 123 and second lens 130 on optical axis 180 surface 7 and 15 are the thickness of the second lens 130 on the optical axis 180; surface 8 is the thickness of the second lens 130 on the optical axis 180 (minus sign indicates light reflection propagation); surface 9 is the first phase retardation The gap between the element 123 and the second lens 130 on the optical axis 180 (the negative sign indicates the reflection and propagation of light); the surface 14 is the gap between the first phase retardation element 123 and the second lens 130 on the optical axis 180; the surface 16 is the gap on the optical axis 180 between the second lens 130 and the second phase retardation element 150 . The gaps and thicknesses represented by positive values in the table are values corresponding to the direction of light toward the eye side, while the gaps and thicknesses represented by negative values are values corresponding to the direction of light toward the image source surface 160 . The traveling direction of the light can be shown with reference to the light path L1 in FIG. 10 .

Table 3 is the aspheric surface data in the first embodiment, wherein: k is the cone surface coefficient in the aspheric surface curve equation, A2, A4, A6, A8, A10, A12, A14, A16, A18 and A20 are high-order aspheric surfaces coefficient.

In addition, the following tables of the embodiments are schematic diagrams corresponding to each embodiment, and the definitions of the data in the tables are the same as those in Tables 1 to 3 of the first embodiment, and will not be repeated. In addition, in each embodiment, the maximum effective radius of any surface of a lens is usually the intersection point of the incident light with 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 intersection point and the optical axis are perpendicular to each other. The distance, or the radius of the part where the lens surface has no surface treatment (the lens surface has a concave-convex structure, or ink, etc.), or the radius of the part where the light can pass through the lens (shading sheet, or spacer ring etc. to block light from passing through the lens), but not limited thereto.

<Second Embodiment>

Please refer to the schematic diagram of the optical lens assembly according to the second embodiment of the present invention shown in FIG. 2 . The optical lens assembly sequentially includes an aperture 200 , a first lens 210 , a The optical element 220 , a second lens 230 , a partial reflection and partial transmission element 240 , a second phase retardation element 250 and an image source surface 260 . The total number of lenses with refractive power in the optical lens group is two, but not limited to this. The optical lens group can be used with an image source 270, and the image source surface 260 can be located on the image source 270. The type of the image source 270 can be a liquid crystal display, an OLED display or an LED display, but not limited to this, and the aperture 200 The position of can be the position where the user's eyes view the image.

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

The optical element 220 includes an absorbing polarizing element 221, a reflective polarizing element 222 and a first phase retardation element 223 in sequence from the eye side to the image source side. ) on the image source side surface 212 of the first lens 210, and the two opposite surfaces of these elements are both flat surfaces. Specifically, the absorbing polarizing element 221 is attached on the image source side surface 212 , the reflective polarizing element 222 is attached on the absorbing polarizing element 221 , and the first phase retardation element 223 is attached on the reflective polarizing element 222 . The first phase delay element 223 is, for example, but not limited to, a quarter wave plate.

The second lens 230 has positive refractive power, the eye-side surface 231 is concave at the near optical axis, the 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 an aspherical surface.

The partially reflective and partially transmissive element 240 is disposed (eg, but not limited to, a coating) on the image source side surface 232 of the second lens 230, and has an average light reflectivity of at least 30% in the visible light range, preferably an average of 50% light reflectivity. The average light reflectivity here refers to the average value of the reflectivity of the partially reflective and partially transmissive elements 240 for light of different wavelengths.

The second phase retardation element 250 is disposed between the partially reflective and partially transmissive element 240 and the image source surface 260 , and is close to the image source surface 260 . The second phase delay element 250 is, for example, but not limited to, a quarter wave plate.

Please refer to Tables 4 to 7 below together. Table 4 Second Embodiment f (overall focal length)=33.53mm, EPD (entrance pupil aperture)=8.00mm, FOV (viewing angle)=100.0 degrees surface Radius of curvature Thickness/gap Refractive index (nd) Dispersion Coefficient (vd) Effective Focal Length (EFL) 0 unlimited -2500.000 – – – 1 aperture unlimited 12.000 – – – 2 first lens 91.925 8.500 1.544 55.9 168.43 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 7.969 – – – 7 second lens -293.204 8.749 1.544 55.9 – 8 Partially Reflective Partially Transmissive Elements -102.220 -8.749 mirror – 9 -293.204 -7.969 – – – 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 7.969 – – 15 second lens -293.204 8.749 1.544 55.9 282.96 16 -102.220 1.240 – – – 17 second phase delay element unlimited 0.100 1.533 56.0 – 18 image source surface unlimited – – – – Note: The reference wavelength is 555nm.

table 5 Aspheric coefficient surface 2 8 16 K: -3.9672E+00 -3.1848E-01 -3.1848E-01 A2: 0.0000E+00 0.0000E+00 0.0000E+00 A4: 8.7604E-07 -8.9732E-08 -8.9732E-08 A6: 2.6898E-09 3.3331E-10 3.3331E-10 A8: -6.2660E-12 -7.1199E-14 -7.1199E-14 A10: 7.0821E-17 5.8415E-17 5.8415E-17 A12: 1.7294E-17 5.9287E-20 5.9287E-20 A14: -2.1005E-20 -1.3481E-24 -1.3481E-24 A16: 7.4253E-24 -5.2421E-26 -5.2421E-26 A18: 0.0000E+00 0.0000E+00 0.0000E+00 A20: 0.0000E+00 0.0000E+00 0.0000E+00

Table 6 f(mm) 33.53 R2(mm) unlimited f1(mm) 168.43 R3(mm) -293.204 f2(mm) 282.96 R4(mm) -102.220 EPD(mm) 8.00 nd1 1.544 Fno 4.19 nd2 1.544 FOV (degrees) 100.6 vd1 55.9 CT1(mm) 8.500 vd2 55.9 CT2(mm) 8.749 TL(mm) 26.858 T2M(mm) 10.089 IMH(mm) 26.940 T1M(mm) 18.358 TDP1(mm) 2.740 R1(mm) 91.925 – –

Table 7 IMH/f 0.80 R1/TL 3.42 f2/f1 1.68 (vd1*nd1)/vd2 1.54 CT2/CT1 1.03 R1/R4 -0.90 CT1/TDP1 3.10 R4/R3 0.35 f/f1 0.20 T2M/CT2 1.15 R1/f1 0.55 TL/IMH 1.00 f/f2 0.12 R4/nd2 (mm) -66.20 R4/f2 -0.36 – –

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 values of the parameters in Table 6 can be calculated from Tables 4 and 5, and the values of the conditional expressions in Table 7 can be calculated from Table 6 is calculated.

<Third Embodiment>

Please refer to the schematic diagram of the optical lens group according to the third embodiment of the present invention shown in FIG. 3 . The optical lens group includes an aperture 300 , a first lens 310 , a The optical element 320 , a second lens 330 , a partial reflection and partial transmission element 340 , a second phase retardation element 350 and an image source surface 360 . The total number of lenses with refractive power in the optical lens group is two, but not limited to this. The optical lens group can be used with an image source 370, and the image source surface 360 can be located on the image source 370. The type of the image source 370 can be a liquid crystal display, an OLED display or an LED display, but not limited to this, and the aperture 300 The position of can be the position where the user's eyes view the image.

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

The optical element 320 includes an absorbing polarizing element 321, a reflective polarizing element 322 and a first phase retardation element 323 in sequence from the eye side to the image source side. ) on the image source side surface 312 of the first lens 310, and the two opposite surfaces of these elements are both flat surfaces. Specifically, the absorbing polarizing element 321 is attached on the image source side surface 312 , the reflective polarizing element 322 is attached on the absorbing polarizing element 321 , and the first phase retardation element 323 is attached on the reflective polarizing element 322 . The first phase delay element 323 is, for example, but not limited to, a quarter wave plate.

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

The partially reflective and partially transmissive element 340 is disposed (eg, but not limited to, a coating) on the image source side surface 332 of the second lens 330, and has an average light reflectivity of at least 30% in the visible light range, preferably an average of 50% light reflectivity. The average light reflectivity here refers to the average value of the reflectivity of the partially reflective and partially transmissive elements 340 for light of different wavelengths.

The second phase retardation element 350 is disposed between the partial reflection and partial transmission element 340 and the image source surface 360 , and is close to the image source surface 360 . The second phase delay element 350 is, for example, but not limited to, a quarter wave plate.

Please refer to Table 8 to Table 11 below together.

Table 8 Third Embodiment f (overall focal length)=26.64mm, EPD (entrance pupil aperture)=8.00mm, FOV (viewing angle)=110.0 degrees surface Radius of curvature Thickness/gap refractive index (nd) Dispersion Coefficient (vd) Effective Focal Length (EFL) 0 unlimited -2500.000 – – – 1 aperture unlimited 12.000 – – – 2 first lens 112.956 5.191 1.544 55.9 206.96 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 5.900 – – – 7 second lens unlimited 6.333 1.544 55.9 – 8 Partially Reflective Partially Transmissive Elements -91.149 -6.333 mirror – 9 unlimited -5.900 – – – 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 5.900 – – 15 second lens unlimited 6.333 1.544 55.9 167.01 16 -91.149 4.273 – – – 17 second phase delay element unlimited 0.100 1.533 56.0 – 18 image source surface unlimited – – – – Note: The reference wavelength is 555nm.

Table 9 Aspheric coefficient surface 2 8 16 K: -3.2483E+00 -4.9646E-01 -4.9646E-01 A2: 0.0000E+00 0.0000E+00 0.0000E+00 A4: 4.9293E-07 -9.8320E-08 -9.8320E-08 A6: 7.2437E-09 1.0662E-09 1.0662E-09 A8: -2.3322E-11 -1.0578E-12 -1.0578E-12 A10: -1.0328E-14 -6.2723E-17 -6.2723E-17 A12: 1.6356E-16 6.1793E-19 6.1793E-19 A14: -2.6979E-19 2.3934E-22 2.3934E-22 A16: 1.3810E-22 -3.8954E-25 -3.8954E-25 A18: 0.0000E+00 0.0000E+00 0.0000E+00 A20: 0.0000E+00 0.0000E+00 0.0000E+00

Table 10 f(mm) 26.64 R2(mm) unlimited f1(mm) 206.96 R3(mm) unlimited f2(mm) 167.01 R4(mm) -91.149 EPD(mm) 8.00 nd1 1.544 Fno 3.33 nd2 1.544 FOV (degrees) 110.0 vd1 55.9 CT1(mm) 5.191 vd2 55.9 CT2(mm) 6.333 TL(mm) 22.197 T2M(mm) 10.706 IMH(mm) 22.450 T1M(mm) 17.006 TDP1(mm) 3.188 R1(mm) 112.956 – –

Table 11 IMH/f 0.84 R1/TL 5.09 f2/f1 0.81 (vd1*nd1)/vd2 1.54 CT2/CT1 1.22 R1/R4 -1.24 CT1/TDP1 1.63 R4/R3 0.00 f/f1 0.13 T2M/CT2 1.69 R1/f1 0.55 TL/IMH 0.99 f/f2 0.16 R4/nd2 (mm) -59.03 R4/f2 -0.55 – –

In the third embodiment, the curve equation of the aspheric surface is the same as the curve equation of the aspheric surface in the first embodiment, the values of the parameters in Table 10 can be calculated from Table 8 and Table 9, and the values of the conditional expressions in Table 11 can be calculated from Table 10 is extrapolated.

<Fourth Embodiment>

Please refer to the schematic diagram of the optical lens group according to the fourth embodiment of the present invention shown in FIG. 4 . The optical lens group includes an aperture 400 , a first lens 410 , a The optical element 420 , a second lens 430 , a partial reflection and partial transmission element 440 , a second phase retardation element 450 and an image source surface 460 . The total number of lenses with refractive power in the optical lens group is two, but not limited to this. The optical lens group can be used with an image source 470, and the image source surface 460 can be located on the image source 470. The type of the image source 470 can be a liquid crystal display, an OLED display or an LED display, but not limited to this, and the aperture 400 The position of can be the position where the user's eyes view the image.

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

The optical element 420 sequentially includes an absorbing polarizing element 421, a reflective polarizing element 422 and a first phase retardation element 423 from the eye side to the image source side. ) on the image source side surface 412 of the first lens 410, and the two opposite surfaces of these elements are both flat surfaces. Specifically, the absorbing polarizing element 421 is attached on the image source side surface 412 , the reflective polarizing element 422 is attached on the absorbing polarizing element 421 , and the first phase retardation element 423 is attached on the reflective polarizing element 422 . The first phase delay element 423 is, for example, but not limited to, a quarter wave plate.

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

The partially reflective and partially transmissive element 440 is disposed (eg, but not limited to, a coating) on the image source side surface 432 of the second lens 430, and has an average light reflectivity of at least 30% in the visible light range, preferably an average of 50% light reflectivity. The average light reflectivity here refers to the average value of the reflectivity of the partially reflective and partially transmissive elements 440 for light of different wavelengths.

The second phase retardation element 450 is disposed between the partial reflection and partial transmission element 440 and the image source surface 460 , and is close to the image source surface 460 . The second phase delay element 450 is, for example, but not limited to, a quarter wave plate.

Please refer to Table 12 to Table 15 below together.

Table 12 Fourth Embodiment f (overall focal length)=24.10mm, EPD (entrance pupil aperture)=8.00mm, FOV (viewing angle)=95.0 degrees surface Radius of curvature Thickness/gap refractive index (nd) Dispersion Coefficient (vd) Effective Focal Length (EFL) 0 unlimited -2500.000 – – – 1 aperture unlimited 12.000 – – – 2 first lens 141.774 2.500 1.544 55.9 259.77 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 4.778 – – – 7 second lens 431.630 8.537 1.544 55.9 – 8 Partially Reflective Partially Transmissive Elements -84.521 -8.537 mirror – 9 431.630 -4.778 – – – 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 4.778 – – 15 second lens 431.630 8.537 1.544 55.9 130.27 16 -84.521 1.500 – – – 17 second phase delay element unlimited 0.100 1.533 56.0 – 18 image source surface unlimited – – – – Note: The reference wavelength is 555nm.

Table 13 Aspheric coefficient surface 2 7 8 9 15 16 K: -7.7675E+01 0.0000E+00 -1.2718E+00 0.0000E+00 0.0000E+00 -1.2718E+00 A2: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A4: 3.3524E-06 1.4664E-06 -2.6342E-07 1.4664E-06 1.4664E-06 -2.6342E-07 A6: 2.4431E-08 5.8168E-10 3.2637E-09 5.8168E-10 5.8168E-10 3.2637E-09 A8: -1.2156E-10 -1.1784E-13 -3.7343E-12 -1.1784E-13 -1.1784E-13 -3.7343E-12 A10: -9.3263E-14 -1.5876E-16 -2.7386E-16 -1.5876E-16 -1.5876E-16 -2.7386E-16 A12: 1.9386E-15 2.6350E-19 4.0583E-18 2.6350E-19 2.6350E-19 4.0583E-18 A14: -4.8241E-18 7.6688E-22 8.3688E-22 7.6688E-22 7.6688E-22 8.3688E-22 A16: 3.8134E-21 0.0000E+00 -3.1559E-24 0.0000E+00 0.0000E+00 -3.1559E-24 A18: 0.0000E+00 0.0000E+00 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 0.0000E+00 0.0000E+00

Table 14 f(mm) 24.10 R2(mm) unlimited f1(mm) 259.77 R3(mm) 431.630 f2(mm) 130.27 R4(mm) -84.521 EPD(mm) 8.00 nd1 1.544 Fno 3.02 nd2 1.544 FOV (degrees) 95.0 vd1 55.9 CT1(mm) 2.500 vd2 55.9 CT2(mm) 8.537 TL(mm) 17.715 T2M(mm) 10.037 IMH(mm) 17.950 T1M(mm) 15.215 TDP1(mm) 1.426 R1(mm) 141.774 – –

Table 15 IMH/f 0.74 R1/TL 8.00 f2/f1 0.50 (vd1*nd1)/vd2 1.54 CT2/CT1 3.41 R1/R4 -1.68 CT1/TDP1 1.75 R4/R3 -0.20 f/f1 0.09 T2M/CT2 1.18 R1/f1 0.55 TL/IMH 0.99 f/f2 0.18 R4/nd2 (mm) -54.74 R4/f2 -0.65 – –

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 14 can be calculated from Table 12 and Table 13, and the values of the conditional expressions in Table 15 can be calculated from Table 14 is extrapolated.

<Fifth Embodiment>

Please refer to the schematic diagram of the optical lens assembly according to the fifth embodiment of the present invention shown in FIG. 5 , the optical lens assembly includes an aperture 500 , a first lens 510 , a The optical element 520 , a second lens 530 , a part of the reflection part of the transmission element 540 , a second phase retardation element 550 and an image source surface 560 . The total number of lenses with refractive power in the optical lens group is two, but not limited to this. The optical lens group can be used with an image source 570, the image source surface 560 can be located on the image source 570, and the type of the image source 570 can be a liquid crystal display, an OLED display or an LED display, but not limited to this, and the aperture 500 The position of can be the position where the user's eyes view the image.

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

The optical element 520 includes an absorbing polarizing element 521, a reflective polarizing element 522 and a first phase retardation element 523 in sequence from the eye side to the image source side. ) on the image source side surface 512 of the first lens 510, and the two opposite surfaces of these elements are both flat surfaces. Specifically, the absorbing polarizing element 521 is attached on the image source side surface 512 , the reflective polarizing element 522 is attached on the absorbing polarizing element 521 , and the first phase retardation element 523 is attached on the reflective polarizing element 522 . The first phase delay element 523 is, for example, but not limited to, a quarter wave plate.

The second lens 530 has a positive refractive power, the eye-side surface 531 is convex at the near optical axis, the image source-side surface 532 is convex at the near-optical axis, and both the eye-side surface 531 and the image source-side surface 532 are is aspherical.

The partially reflective and partially transmissive element 540 is disposed (such as, but not limited to, a coating) on the image source side surface 532 of the second lens 530, and has an average light reflectivity of at least 30% in the visible light range, preferably an average of 50% light reflectivity. The average light reflectivity here refers to the average value of the reflectivity of the partially reflective and partially transmissive elements 540 for light of different wavelengths.

The second phase retardation element 550 is disposed between the partial reflection and partial transmission element 540 and the image source surface 560 , and is close to the image source surface 560 . The second phase delay element 550 is, for example, but not limited to, a quarter wave plate.

Please refer to Table 16 to Table 19 below together.

Table 16 Fifth Embodiment f (overall focal length)=18.16mm, EPD (entrance pupil aperture)=8.00mm, FOV (viewing angle)=95.0 degrees surface Radius of curvature Thickness/gap refractive index (nd) Dispersion Coefficient (vd) Effective Focal Length (EFL) 0 unlimited -2500.000 – – – 1 aperture unlimited 11.000 – – – 2 first lens 108.056 2.514 1.544 55.9 197.99 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 2.545 – – – 7 second lens 179.447 7.741 1.544 55.9 – 8 Partially Reflective Partially Transmissive Elements -67.226 -7.741 mirror – 9 179.447 -2.545 – – – 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 2.545 – – 15 second lens 179.447 7.741 1.544 55.9 90.61 16 -67.226 1.500 – – – 17 second phase delay element unlimited 0.100 1.533 56.0 – 18 image source surface unlimited – – – – Note: The reference wavelength is 555nm.

Table 17 Aspheric coefficient surface 2 7 8 9 15 16 K: 1.1364E+01 0.0000E+00 2.0112E+00 0.0000E+00 0.0000E+00 2.0112E+00 A2: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A4: -1.1288E-05 1.4810E-06 8.0239E-07 1.4810E-06 1.4810E-06 8.0239E-07 A6: 1.1791E-07 -4.1978E-09 4.8614E-09 -4.1978E-09 -4.1978E-09 4.8614E-09 A8: -4.5832E-10 7.3906E-12 -6.2530E-12 7.3906E-12 7.3906E-12 -6.2530E-12 A10: -1.3503E-12 1.2185E-14 -4.1795E-17 1.2185E-14 1.2185E-14 -4.1795E-17 A12: 1.6301E-14 3.9584E-18 1.9987E-17 3.9584E-18 3.9584E-18 1.9987E-17 A14: -4.8248E-17 -5.2455E-21 -4.4861E-21 -5.2455E-21 -5.2455E-21 -4.4861E-21 A16: 4.8308E-20 -5.2068E-24 -7.0400E-25 -5.2068E-24 -5.2068E-24 -7.0400E-25 A18: 0.0000E+00 0.0000E+00 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 0.0000E+00 0.0000E+00

Table 18 f(mm) 18.16 R2(mm) unlimited f1(mm) 197.99 R3(mm) 179.447 f2(mm) 90.61 R4(mm) -67.226 EPD(mm) 8.00 nd1 1.544 Fno 2.27 nd2 1.544 FOV (degrees) 95.0 vd1 55.9 CT1(mm) 2.514 vd2 55.9 CT2(mm) 7.741 TL(mm) 14.700 T2M(mm) 9.241 IMH(mm) 13.470 T1M(mm) 12.186 TDP1(mm) 1.193 R1(mm) 108.056 – –

Table 19 IMH/f 0.74 R1/TL 7.35 f2/f1 0.46 (vd1*nd1)/vd2 1.54 CT2/CT1 3.08 R1/R4 -1.61 CT1/TDP1 2.11 R4/R3 -0.37 f/f1 0.09 T2M/CT2 1.19 R1/f1 0.55 TL/IMH 1.09 f/f2 0.20 R4/nd2 (mm) -43.54 R4/f2 -0.74 – –

In the fifth 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 18 can be calculated from Table 16 and Table 17, and the values of the conditional expressions in Table 19 can be calculated from Table 18 is extrapolated.

<Sixth Embodiment>

Please refer to the schematic diagram of the optical lens group according to the sixth embodiment of the present invention shown in FIG. 6 . The optical lens group includes an aperture 600 , a first lens 610 , a The optical element 620 , a second lens 630 , a partial reflection and partial transmission element 640 , a second phase retardation element 650 and an image source surface 660 . The total number of lenses with refractive power in the optical lens group is two, but not limited to this. The optical lens group can be used with an image source 670, and the image source surface 660 can be located on the image source 670. The type of the image source 670 can be a liquid crystal display, an OLED display or an LED display, but not limited to this, and the aperture 600 The position of can be the position where the user's eyes view the image.

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

The optical element 620 includes an absorbing polarizing element 621, a reflective polarizing element 622 and a first phase retardation element 623 in sequence from the eye side to the image source side. ) on the image source side surface 612 of the first lens 610, and the two opposite surfaces of these elements are both flat surfaces. Specifically, the absorbing polarizing element 621 is attached on the image source side surface 612 , the reflective polarizing element 622 is attached on the absorbing polarizing element 621 , and the first phase retardation element 623 is attached on the reflective polarizing element 622 . The first phase delay element 623 is, for example, but not limited to, a quarter wave plate.

The second lens 630 has positive refractive power, the eye-side surface 631 is convex at the near optical axis, the image source-side surface 632 is convex at the near-optical axis, and both the eye-side surface 631 and the image source-side surface 632 are is aspherical.

The partially reflective and partially transmissive element 640 is disposed (such as, but not limited to, a coating) on the image source side surface 632 of the second lens 630, and has an average light reflectivity of at least 30% in the visible light range, preferably an average of 50% light reflectivity. The average light reflectivity here refers to the average value of the reflectivity of the partially reflective and partially transmissive elements 640 for light of different wavelengths.

The second phase retardation element 650 is disposed between the partially reflective and partially transmissive element 640 and the image source surface 660 , and is close to the image source surface 660 . The second phase delay element 650 is, for example, but not limited to, a quarter wave plate.

Please refer to Table 20 to Table 23 below together.

Table 20 Sixth Embodiment f (overall focal length) = 13.41mm, EPD (entrance pupil aperture) = 8.00mm, FOV (angle of view) = 85.0 degrees surface Radius of curvature Thickness/gap refractive index (nd) Dispersion Coefficient (vd) Effective Focal Length (EFL) 0 unlimited -2500.000 – – – 1 aperture unlimited 11.000 – – – 2 first lens 53.570 2.300 1.544 55.9 98.15 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 0.856 – – – 7 second lens 179.760 7.092 1.544 55.9 – 8 Partially Reflective Partially Transmissive Elements -49.127 -7.092 mirror – 9 179.760 -0.856 – – – 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 0.856 – – 15 second lens 179.760 7.092 1.544 55.9 71.48 16 -49.127 0.900 – – – 17 second phase delay element unlimited 0.100 1.533 56.0 – 18 image source surface unlimited – – – – Note: The reference wavelength is 555nm.

Table 21 Aspheric coefficient surface 2 7 8 9 15 16 K: 4.5781E+00 0.0000E+00 2.8970E+00 0.0000E+00 0.0000E+00 2.8970E+00 A2: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A4: -3.3898E-05 6.7380E-06 3.3946E-06 6.7380E-06 6.7380E-06 3.3946E-06 A6: 4.0718E-07 -4.2378E-08 1.8634E-08 -4.2378E-08 -4.2378E-08 1.8634E-08 A8: -2.2482E-09 -1.3628E-11 -5.8787E-11 -1.3628E-11 -1.3628E-11 -5.8787E-11 A10: -1.2430E-11 3.5041E-13 -3.2246E-14 3.5041E-13 3.5041E-13 -3.2246E-14 A12: 1.9153E-13 1.0856E-15 2.7390E-16 1.0856E-15 1.0856E-15 2.7390E-16 A14: -8.0293E-16 -4.1135E-18 1.1070E-18 -4.1135E-18 -4.1135E-18 1.1070E-18 A16: 1.1354E-18 0.0000E+00 -2.9119E-21 0.0000E+00 0.0000E+00 -2.9119E-21 A18: 0.0000E+00 0.0000E+00 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 0.0000E+00 0.0000E+00

Table 22 f(mm) 13.41 R2(mm) unlimited f1(mm) 98.15 R3(mm) 179.760 f2(mm) 71.48 R4(mm) -49.127 EPD(mm) 8.00 nd1 1.544 Fno 1.68 nd2 1.544 FOV (degrees) 85.0 vd1 55.9 CT1(mm) 2.300 vd2 55.9 CT2(mm) 7.092 TL(mm) 11.547 T2M(mm) 8.092 IMH(mm) 8.980 T1M(mm) 9.247 TDP1(mm) 1.235 R1(mm) 53.570 – –

Table 23 IMH/f 0.67 R1/TL 4.64 f2/f1 0.73 (vd1*nd1)/vd2 1.54 CT2/CT1 3.08 R1/R4 -1.09 CT1/TDP1 1.86 R4/R3 -0.27 f/f1 0.14 T2M/CT2 1.14 R1/f1 0.55 TL/IMH 1.29 f/f2 0.19 R4/nd2 (mm) -31.82 R4/f2 -0.69 – –

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 22 can be calculated from Table 20 and Table 21, and the values of the conditional expressions in Table 23 can be calculated from Table 22 is extrapolated.

<Seventh Embodiment>

Please refer to the schematic diagram of the optical lens assembly according to the seventh embodiment of the present invention shown in FIG. 7 . The optical lens assembly includes an aperture 700 , a first lens 710 , an aperture 700 , a first lens 710 , a The optical element 720 , a second lens 730 , a part of the reflective part of the transmission element 740 , a second phase retardation element 750 and an image source surface 760 . The total number of lenses with refractive power in the optical lens group is two, but not limited to this. The optical lens group can be used with an image source 770, and the image source surface 760 can be located on the image source 770. The type of the image source 770 can be a liquid crystal display, an OLED display or an LED display, but not limited to this, and the aperture 700 The position of can be the position where the user's eyes view the image.

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

The optical element 720 includes an absorbing polarizing element 721, a reflective polarizing element 722 and a first phase retardation element 723 in sequence from the eye side to the image source side. ) on the image source side surface 712 of the first lens 710, and the two opposite surfaces of these elements are both flat surfaces. Specifically, an absorptive polarizer 721 is attached to the image source side surface 712 , a reflective polarizer 722 is attached to the absorptive polarizer 721 , and a first phase retardation element 723 is attached to the reflective polarizer 722 . The first phase delay element 723 is, for example, but not limited to, a quarter wave plate.

The second lens 730 has positive refractive power, its eye-side surface 731 is convex at the near optical axis, its image source side surface 732 is convex at the near optical axis, and both the side surface 731 and the image source side surface 732 are Aspherical.

The partially reflective and partially transmissive element 740 is disposed (eg, but not limited to, a coating) on the image source side surface 732 of the second lens 730, and has an average light reflectivity of at least 30% in the visible light range, preferably an average of 50% light reflectivity. The average light reflectivity here refers to the average value of the reflectivity of the partially reflective and partially transmissive elements 740 for light of different wavelengths.

The second phase retardation element 750 is disposed between the partially reflective and partially transmissive element 740 and the image source surface 760 , and is close to the image source surface 760 . The second phase delay element 750 is, for example, but not limited to, a quarter wave plate.

Please refer to Table 24 to Table 27 below together.

Table 24 Seventh Embodiment f (overall focal length)=18.11mm, EPD (entrance pupil aperture)=8.00mm, FOV (viewing angle)=95.0 degrees surface Radius of curvature Thickness/gap refractive index (nd) Dispersion Coefficient (vd) Effective Focal Length (EFL) 0 unlimited -2500.000 – – – 1 aperture unlimited 11.000 – – – 2 first lens 133.720 1.836 1.544 55.9 245.00 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 1.720 – – – 7 second lens 141.175 9.140 1.544 55.9 – 8 Partially Reflective Partially Transmissive Elements -68.412 -9.140 mirror – 9 141.175 -1.720 – – – 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 1.720 – – 15 second lens 141.175 9.140 1.544 55.9 85.75 16 -68.412 1.500 – – – 17 second phase delay element unlimited 0.100 1.533 56.0 – 18 image source surface unlimited – – – – Note: The reference wavelength is 555nm.

Table 25 Aspheric coefficient surface 2 7 8 9 15 16 K: 1.6276E+01 0.0000E+00 2.1582E+00 0.0000E+00 0.0000E+00 2.1582E+00 A2: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A4: -1.0016E-05 4.9293E-07 7.1946E-07 4.9293E-07 4.9293E-07 7.1946E-07 A6: 1.1487E-07 -5.1330E-09 4.6281E-09 -5.1330E-09 -5.1330E-09 4.6281E-09 A8: -4.4084E-10 9.2049E-12 -6.4740E-12 9.2049E-12 9.2049E-12 -6.4740E-12 A10: -1.3708E-12 1.8251E-14 9.5439E-17 1.8251E-14 1.8251E-14 9.5439E-17 A12: 1.6180E-14 1.3892E-17 2.1307E-17 1.3892E-17 1.3892E-17 2.1307E-17 A14: -4.8146E-17 1.7467E-22 -1.7817E-21 1.7467E-22 1.7467E-22 -1.7817E-21 A16: 4.8581E-20 -4.4598E-23 2.4932E-24 -4.4598E-23 -4.4598E-23 2.4932E-24 A18: 0.0000E+00 0.0000E+00 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 0.0000E+00 0.0000E+00

Table 26 f(mm) 18.11 R2(mm) unlimited f1(mm) 245.01 R3(mm) 141.175 f2(mm) 85.75 R4(mm) -68.412 EPD(mm) 8.00 nd1 1.544 Fno 2.27 nd2 1.544 FOV (degrees) 95.0 vd1 55.9 CT1(mm) 1.836 vd2 55.9 CT2(mm) 9.140 TL(mm) 14.596 T2M(mm) 10.640 IMH(mm) 13.470 T1M(mm) 12.760 TDP1(mm) 0.952 R1(mm) 133.720 – –

Table 27 IMH/f 0.74 R1/TL 9.16 f2/f1 0.35 (vd1*nd1)/vd2 1.54 CT2/CT1 4.98 R1/R4 -1.95 CT1/TDP1 1.93 R4/R3 -0.48 f/f1 0.07 T2M/CT2 1.16 R1/f1 0.55 TL/IMH 1.08 f/f2 0.21 R4/nd2 (mm) -44.31 R4/f2 -0.80 – –

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 26 can be calculated from Table 24 and Table 25, and the values of the conditional expressions in Table 27 can be calculated from Table 26 is extrapolated.

<Eighth Embodiment>

Please refer to the schematic diagram of the optical lens group according to the eighth embodiment of the present invention shown in FIG. 8 . The optical lens group includes an aperture 800 , a first lens 810 , a The optical element 820 , a second lens 830 , a part of the reflection part of the transmission element 840 , a second phase retardation element 850 and an image source surface 860 . The total number of lenses with refractive power in the optical lens group is two, but not limited to this. The optical lens group can be used with an image source 870, and the image source surface 860 can be located on the image source 870. The type of the image source 870 can be a liquid crystal display, an OLED display or an LED display, but not limited to this, and the aperture 800 The position of can be the position where the user's eyes view the image.

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

The optical element 820 includes an absorbing polarizing element 821, a reflective polarizing element 822 and a first phase retardation element 823 in sequence from the eye side to the image source side. ) on the image source side surface 812 of the first lens 810, and the two opposite surfaces of these elements are both flat surfaces. Specifically, an absorptive polarizer 821 is attached to the image source side surface 812 , a reflective polarizer 822 is attached to the absorptive polarizer 821 , and a first phase retardation element 823 is attached to the reflective polarizer 822 . The first phase delay element 823 is, for example, but not limited to, a quarter wave plate.

The second lens 830 has positive refractive power, the eye-side surface 831 is convex at the near optical axis, the image source-side surface 832 is convex at the near optical axis, and both the eye-side surface 831 and the image source-side surface 832 are is aspherical.

The partially reflective and partially transmissive element 840 is disposed (eg, but not limited to, a coating) on the image source side surface 832 of the second lens 830, and has an average light reflectivity of at least 30% in the visible light range, preferably an average of 50% light reflectivity. The average light reflectivity here refers to the average value of the reflectivity of the partially reflective and partially transmissive elements 840 for light of different wavelengths.

The second phase retardation element 850 is disposed between the partially reflective and partially transmissive element 840 and the image source surface 860 , and is close to the image source surface 860 . The second phase delay element 850 is, for example, but not limited to, a quarter wave plate.

Please refer to Table 28 to Table 31 below together.

Table 28 Eighth Embodiment f (overall focal length)=21.71mm, EPD (entrance pupil aperture)=8.00mm, FOV (viewing angle)=120.0 degrees surface Radius of curvature Thickness/gap refractive index (nd) Dispersion Coefficient (vd) Effective Focal Length (EFL) 0 unlimited -2500.000 – – – 1 aperture unlimited 12.000 – – – 2 first lens 135.417 5.334 1.544 55.9 248.16 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 2.262 – – – 7 second lens 144.651 10.152 1.544 55.9 – 8 Partially Reflective Partially Transmissive Elements -85.320 -10.152 mirror – 9 144.651 -2.262 – – – 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 2.262 – – 15 second lens 144.651 10.152 1.544 55.9 99.90 16 -85.320 2.438 – – – 17 second phase delay element unlimited 0.100 1.533 56.0 – 18 image source surface unlimited – – – – Note: The reference wavelength is 555nm.

Table 29 Aspheric coefficient surface 2 7 8 9 15 16 K: 1.4194E+01 0.0000E+00 2.7367E+00 0.0000E+00 0.0000E+00 2.7367E+00 A2: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A4: 1.7422E-06 -3.0052E-06 5.1916E-07 -3.0052E-06 -3.0052E-06 5.1916E-07 A6: -5.7554E-09 7.1301E-09 1.3332E-09 7.1301E-09 7.1301E-09 1.3332E-09 A8: -7.0724E-12 -8.3796E-12 -3.8739E-13 -8.3796E-12 -8.3796E-12 -3.8739E-13 A10: 3.8673E-14 -3.3525E-15 -8.5782E-16 -3.3525E-15 -3.3525E-15 -8.5782E-16 A12: -6.8425E-17 7.0308E-18 -1.4677E-18 7.0308E-18 7.0308E-18 -1.4677E-18 A14: 5.9007E-20 -2.3845E-21 1.6597E-21 -2.3845E-21 -2.3845E-21 1.6597E-21 A16: -2.1294E-23 0.0000E+00 -1.1545E-25 0.0000E+00 0.0000E+00 -1.1545E-25 A18: 0.0000E+00 0.0000E+00 -8.6115E-29 0.0000E+00 0.0000E+00 -8.6115E-29 A20: 0.0000E+00 0.0000E+00 -6.4314E-32 0.0000E+00 0.0000E+00 -6.4314E-32

Table 30 f(mm) 21.73 R2(mm) unlimited f1(mm) 248.16 R3(mm) 144.651 f2(mm) 99.90 R4(mm) -85.320 EPD(mm) 8.00 nd1 1.544 Fno 2.72 nd2 1.544 FOV (degrees) 120.0 vd1 55.9 CT1(mm) 5.334 vd2 55.9 CT2(mm) 10.152 TL(mm) 20.586 T2M(mm) 12.660 IMH(mm) 19.564 T1M(mm) 15.252 TDP1(mm) 2.564 R1(mm) 135.417 – –

Table 31 IMH/f 0.90 R1/TL 6.58 f2/f1 0.40 (vd1*nd1)/vd2 1.54 CT2/CT1 1.90 R1/R4 -1.59 CT1/TDP1 2.08 R4/R3 -0.59 f/f1 0.09 T2M/CT2 1.25 R1/f1 0.55 TL/IMH 1.05 f/f2 0.22 R4/nd2 (mm) -55.26 R4/f2 -0.85 – –

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 30 can be calculated from Table 28 and Table 29, and the values of the conditional expressions in Table 31 can be calculated from Table 30 is extrapolated.

<Ninth Embodiment>

Please refer to the schematic diagram of the optical lens group according to the ninth embodiment of the present invention shown in FIG. 9 , the optical lens group sequentially includes an aperture 900 , a first lens 910 , a The optical element 920 , a second lens 930 , a part of the reflection part of the transmission element 940 , a second phase retardation element 950 and an image source surface 960 . The total number of lenses with refractive power in the optical lens group is two, but not limited to this. The optical lens group can be used with an image source 970 . The optical element 920 includes an absorbing polarizing element 921 , a reflective polarizing element 922 and a first phase retardation element 923 in sequence from the eye side to the image source side.

Aperture 900, first lens 910, absorbing polarizing element 921, reflective polarizing element 922, first phase retardation element 923, second lens 930, partially reflective and partially transmissive element 940, second phase retardation element 950, image source surface 960 and the configuration of the image source 970 can be the same as the aperture, the first lens, the absorbing polarizing element, the reflective polarizing element, the first phase retardation element, the second lens, part of The configurations of the reflective partial transmission element, the second phase retardation element, the image source surface and the image source will not be repeated here.

The optical element 920 further includes an anti-reflection film 924, the anti-reflection film 924 is closer to the image source side than the first phase retardation element 923, and can be stacked (such as but not limited to a film) on the first phase retardation element 923, and Both opposite surfaces are flat.

For the optical lens group provided by this creation, the material of the lens 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 aspherical lens surface in the optical lens group can be made into a shape other than spherical to obtain more control variables, and to reduce aberrations, thereby reducing the number of lenses used, thus effectively reducing the cost of this creative optical lens group. total length.

In the optical lens set provided by this creation, for a lens with refractive power, 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 convex When the concave surface is concave 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 set provided by the present invention can be applied to a head-mounted electronic device. Please refer to FIG. 11 , which is a schematic diagram of a head-mounted electronic device according to an embodiment of the present invention. The head-mounted electronic device 10 is, for example, but not limited to, a head-mounted display using virtual reality (VR) technology, and includes a casing 1001 , an optical module 1002 disposed in the casing 1001 , and an image source 1003 and a controller 1004.

The optomechanical module 1002 corresponds to the user's left eye and right eye respectively. The optical-mechanical module 1002 includes an optical lens group, and the optical lens group can be any one of the optical lens group of the first embodiment to the ninth embodiment.

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

The controller 1004 is electrically connected to the image source 1003 to control the image source 1003 to display an image, whereby the head-mounted electronic device 10 can project a stereoscopic image to the user's eyes to form a virtual image.

100, 200, 300, 400, 500, 600, 700, 800, 900: Aperture 110, 210, 310, 410, 510, 610, 710, 810, 910: First lens 111, 211, 311, 411, 511, 611, 711, 811: Mesh side surface 112, 212, 312, 412, 512, 612, 712, 812: Image source side surface 120, 220, 320, 420, 520, 620, 720, 820, 920: Optical Components 121, 221, 321, 421, 521, 621, 721, 821, 921: Absorptive polarizers 122, 222, 322, 422, 522, 622, 722, 822, 922: Reflective polarizing element 123, 223, 323, 423, 523, 623, 723, 823, 923: first phase delay element 130, 230, 330, 430, 530, 630, 730, 830, 930: Second lens 131, 231, 331, 431, 531, 631, 731, 831: Mesh side surface 132, 232, 332, 432, 532, 632, 732, 832: Image source side surface 140, 240, 340, 440, 540, 640, 740, 840, 940: Partially reflective and partially transmissive elements 150, 250, 350, 450, 550, 650, 750, 850, 950: Second Phase Delay Element 160, 260, 360, 460, 560, 660, 760, 860, 960: Image source surface 170, 270, 370, 470, 570, 670, 770, 870, 970: Image source 180, 280, 380, 480, 580, 680, 780, 880, 980: Optical axis 924: Anti-Reflection Coating 10: Head-mounted electronics 1001: Shell 1002: Opto-mechanical module 1003: Image source 1004: Controller IMH: Maximum image source height of the optical lens group TL: The distance from the eye-side surface of the first lens to the image source surface on the optical axis T1M: The distance from the image source side surface of the first lens to the image source surface on the optical axis T2M: The distance from the eye-side surface of the second lens to the image source surface on the optical axis TDP1: The displacement amount parallel to the optical axis from the intersection of the eye-side surface of the first lens on the optical axis to the position of the maximum effective radius of the eye-side surface of the first lens L1: light path

FIG. 1A presents a schematic diagram of an optical lens assembly according to a first embodiment of the present invention; FIG. 1B presents a partial enlarged view of FIG. 1A; FIG. 2 presents a schematic diagram of an optical lens assembly according to a second embodiment of the present invention; FIG. 3 presents a schematic diagram of an optical lens assembly according to a third embodiment of the present invention; FIG. 4 presents a schematic diagram of an optical lens assembly according to a fourth embodiment of the present invention; FIG. 5 presents a schematic diagram of an optical lens group according to a fifth embodiment of the present invention; FIG. 6 presents a schematic diagram of an optical lens group according to a sixth embodiment of the present invention; FIG. 7 presents a schematic diagram of an optical lens assembly according to a seventh embodiment of the present invention; FIG. 8 presents a schematic diagram of an optical lens assembly according to an eighth embodiment of the present invention; FIG. 9 presents a schematic diagram of an optical lens group according to a ninth embodiment of the present invention; FIG. 10 presents a schematic diagram of parameters and optical paths according to the first embodiment of the present invention; and FIG. 11 is a schematic diagram of a head-mounted electronic device according to an embodiment of the present invention.

100: Aperture

110: The first lens

111: Eye side surface

112: Image source side surface

120: Optical Components

121: Absorption polarizer

122: Reflective polarizing element

123: first phase delay element

130: Second lens

131: Eye side surface

132: Image source side surface

140: Partially Reflective Partially Transmissive Element

150: Second phase delay element

160: Image source surface

170: Image source

180: Optical axis

Claims (15)

An optical lens group, comprising in sequence from the eye side to the image source side: a first lens with positive refractive power, and the eye-side surface of the first lens is convex at the near optical axis; an optical element including an absorbing polarizing element, a reflective polarizing element and a first phase retardation element in sequence from the eye side to the image source side; a second lens with positive refractive power, the image source side surface of the second lens is convex at the near optical axis, and at least one of the eye side surface and the image source side surface of the second lens is aspherical; Part of the reflective part of the transmission element; a second phase delay element; and a source surface; Wherein, the total number of lenses with refractive power in the optical lens group is two, the overall focal length of the optical lens group is f, the maximum image source height of the optical lens group is IMH, the focal length of the first lens is f1, the first lens The focal length of the second lens is f2, and the following conditions are satisfied: 0.40<IMH∕f<1.26; and 0.21<f2∕f1<2.35. The optical lens group according to claim 1, wherein the thickness of the first lens on the optical axis is CT1, the thickness of the second lens on the optical axis is CT2, and the following conditions are satisfied: 0.62<CT2∕CT1<6.97 . The optical lens set according to claim 1, wherein the thickness of the first lens on the optical axis is CT1, the intersection of the eye-side surface of the first lens on the optical axis to the maximum of the eye-side surface of the first lens The displacement of the effective radius position parallel to the optical axis is TDP1, and satisfies the following conditions: 0.98<CT1∕TDP1<5.79. The optical lens group according to claim 1, wherein the overall focal length of the optical lens group is f, the focal length of the first lens is f1, and the following conditions are satisfied: 0.04<f∕f1<0.28. The optical lens group according to claim 1, wherein the curvature radius of the eye-side surface of the first lens is R1, the focal length of the first lens is f1, and the following conditions are satisfied: 0.33<R1∕f1<0.76. The optical lens group according to claim 1, wherein the overall focal length of the optical lens group is f, the focal length of the second lens is f2, and the following conditions are satisfied: 0.07<f∕f2<0.30. The optical lens group according to claim 1, wherein the curvature radius of the image source side surface of the second lens is R4, the focal length of the second lens is f2, and the following conditions are satisfied: -1.20<R4∕f2<-0.22 . The optical lens set according to claim 1, wherein the distance from the eye-side surface of the first lens to the image source surface on the optical axis is TL, the curvature radius of the eye-side surface of the first lens is R1, and satisfies The following conditions: 2.05<R1∕TL<12.83. The optical lens set according to claim 1, wherein the Abbe number of the first lens is vd1, the Abbe number of the second lens is vd2, the refractive index of the first lens is nd1, and the following conditions are met: 0.93 <(vd1*nd1)∕vd2<2.16. The optical lens group according to claim 1, wherein the curvature radius of the eye-side surface of the first lens is R1, the curvature radius of the image source-side surface of the second lens is R4, and the following conditions are satisfied: -2.74<R1 ∕R4<-0.54. The optical lens group according to claim 1, wherein the curvature radius of the eye-side surface of the second lens is R3, the curvature radius of the image source-side surface of the second lens is R4, and the following conditions are satisfied: -0.83<R4 ∕R3<0.49. The optical lens set according to claim 1, wherein the distance from the eye-side surface of the second lens to the image source surface on the optical axis is T2M, the thickness of the second lens on the optical axis is CT2, and satisfies the following Condition: 0.68<T2M∕CT2<2.37. The optical lens group according to claim 1, wherein the distance from the eye-side surface of the first lens 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 : 0.54<TL∕IMH<1.80. The optical lens group according to claim 1, wherein the radius of curvature of the image source side surface of the second lens is R4, the refractive index of the second lens is nd2, and the following conditions are satisfied: -116.45<R4∕nd2<- 19.09. A head-mounted electronic device, comprising: a shell; The optical lens group according to any one of claims 1 to 14, arranged in the housing; an image source, disposed in the housing, and disposed on the image source surface of the optical lens group; and A controller is arranged in the casing and is electrically connected to the image source.

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