Optical lens group and head-mounted electronic device

Abstract

The optical lens assembly, from the eye side to the image source side, sequentially comprises: a first lens with positive refractive power; optical elements, from the eye side to the image source side, sequentially comprising an absorptive polarizing element, a reflective polarizing element, and a first phase retardation element; a second lens with positive refractive power; a partially reflective and partially transmissive element; a second phase retardation element; and an image source surface. The total number of refractive lenses in this optical lens assembly is two. The overall focal length of the optical lens assembly is f, the maximum image source height of the optical lens assembly is IMH, the focal length of the first lens is f1, and the focal length of the second lens is f2, and at least satisfy the following conditions: 0.40 < IMH / f < 1.26; and 0.21 < f2 / f1 < 2.35. Furthermore, the head-mounted electronic device includes this optical lens assembly.

Description

Technical Field

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

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

[0003] Therefore, the purpose of this invention is to provide an optical lens assembly and a head-mounted electronic device, which, when the refractive lens in the optical lens assembly meets certain conditions, can not only fold the optical path to reduce the weight of the device, but also ensure the imaging quality.

[0004] To achieve the above objectives, the present invention provides an optical lens assembly, comprising, from the eye side to the image source side, the following in sequence: a first lens having positive refractive power, wherein the eye-side surface of the first lens is convex near the optical axis; an optical element comprising, from the eye side to the image source side, an absorptive polarizing element, a reflective polarizing element, and a first phase retardation element; a second lens having positive refractive power, wherein the image source-side surface of the second lens is convex near the optical axis, and at least one of the eye-side surface and the image source-side surface of the second lens is aspherical; a partially reflective and partially transmissive element; a second phase retardation element; and an image source surface.

[0005] 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, and the focal length of the second lens is f2, satisfying the following conditions: 0.40 < IMH / f < 1.26; and 0.21 < f2 / f1 < 2.35. This helps to achieve a more appropriate distribution of refractive power in the optical lens group, thereby reducing aberrations.

[0006] Alternatively, the optical lens group may contain a total of two lenses with refractive power.

[0007] The thickness of the first lens along the optical axis is CT1, and the thickness of the second lens along the optical axis is CT2, satisfying the condition: 0.62 < CT2 / CT1 < 6.97. This helps to ensure that the lens thickness meets the processing requirements of lens manufacturing while maintaining image quality.

[0008] The thickness of the first lens on the optical axis is CT1, and the displacement parallel to the optical axis from the intersection of the eye-side surface of the first lens with the optical axis to the position of the maximum effective radius of the eye-side surface of the first lens is TDP1, satisfying the following condition: 0.98 < CT1 / TDP1 < 5.79. This helps to achieve optimal performance and optimal assembly stability of the first lens.

[0009] The overall focal length of the optical lens group is f, and the focal length of the first lens is f1, satisfying the condition: 0.04 < f / f1 < 0.28. This helps to enhance the wide-angle characteristics of the optical lens group, provide a larger viewing angle, and maintain the illumination of the optical lens group.

[0010] The first lens has a radius of curvature of R1 on its eye-side surface and a focal length of f1, satisfying the condition: 0.33 < R1 / f1 < 0.76. This helps to effectively improve the distortion and reduce the aberrations of the optical lens group, and further reduce the lens size.

[0011] The overall focal length of the optical lens group is f, and the focal length of the second lens is f2, satisfying the condition: 0.07 < f / f2 < 0.30. This helps to enhance the wide-angle characteristics of the optical lens group, provide a larger viewing angle, and maintain the illumination of the optical lens group.

[0012] The second lens has a radius of curvature of R4 on its image source side surface and a focal length of f2, satisfying the condition: -1.20 < R4 / f2 < -0.22. This helps to effectively reduce image field curvature, improve the imaging quality of the optical lens group, and ensure lens shape retention.

[0013] The distance from the eye-side surface of the first lens to the image source surface on the optical axis is TL, and the radius of curvature of the eye-side surface of the first lens is R1, satisfying the following condition: 2.05 < R1 / TL < 12.83. This helps to maintain suitable lens shape properties.

[0014] The first lens has an Abbe number of vd1, the second lens has an Abbe number of vd2, and the first lens has a refractive index of nd1, satisfying the condition: 0.93 < (vd1*nd1) / vd2 < 2.16. This allows for a more suitable material combination between the first and second lenses, resulting in better image quality.

[0015] The first lens has a radius of curvature of R1 on its eye-side surface, and the second lens has a radius of curvature of R4 on its image-source-side surface, satisfying the condition: -2.74 < R1 / R4 < -0.54. This mutual constraint between the two radii of curvature helps prevent excessively small radii of curvature and reduces sensitivity to assembly tolerances.

[0016] The second lens has an eye-side surface radius of curvature of R3 and an image-source-side surface radius of curvature of R4, satisfying the condition: -0.83 < R4 / R3 < 0.49. This mutual constraint between the two radii of curvature helps prevent excessively small radii of curvature and reduces sensitivity to assembly tolerances.

[0017] The distance from the eye-side surface of the second lens to the image source surface on the optical axis is T2M, and the thickness of the second lens on the optical axis is CT2, satisfying the following condition: 0.68 < T2M / CT2 < 2.37. This helps to achieve a more appropriate balance between the lens shaping properties and refractive power of the second lens.

[0018] The distance from the eye-side surface of the first lens to the image source surface on the optical axis is TL, and the maximum image source height of the optical lens group is IMH, satisfying the following condition: 0.54 < TL / IMH < 1.80. This helps 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.

[0019] The second lens has a radius of curvature of R4 on its image source side surface and a refractive index of nd2, satisfying the condition: -116.45mm < R4 / nd2 < -19.09mm. This helps to achieve an optimal balance between lens shapeability and performance when selecting second lenses made of different materials.

[0020] Alternatively, the image source side surface of the second lens may be convex near the optical axis.

[0021] Alternatively, the reflective portion of the transmissive element has an average light reflectance of at least 30% in the visible light range, preferably 50%.

[0022] Alternatively, the optical element may further include an anti-reflective coating that is closer to the image source side than the phase retardation element.

[0023] Alternatively, the overall focal length of the optical lens group is f, and the following condition must be met: 12.07mm < f < 38.00mm.

[0024] Alternatively, the maximum field of view of the optical lens group is FOV, and the following conditions must be met: 76.5 degrees < FOV < 132.0 degrees.

[0025] 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.

[0026] Alternatively, the maximum image source height of the optical lens group is IMH, and the following conditions must be met: 8.08mm < IMH < 29.63mm.

[0027] Furthermore, the present invention also provides a head-mounted electronic device, comprising: a housing; an optical lens group disposed within the housing; an image source disposed within the housing and disposed on the image source surface of the optical lens group; and a controller disposed within the housing and electrically connected to the image source. The optical lens group, from the eye side to the image source side, sequentially comprises: a first lens having positive refractive power, the eye-side surface of the first lens being convex near the optical axis; optical elements, from the eye side to the image source side, sequentially comprising an absorptive polarizing element, a reflective polarizing element, and a first phase retardation element; a second lens having positive refractive power, the image source-side surface of the second lens being convex near the optical axis, at least one of the eye-side surface and the image source-side surface of the second lens being aspherical; a partially reflective and partially transmissive element; a second phase retardation element; and an image source surface.

[0028] 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, and the focal length of the second lens is f2, satisfying the following conditions: 0.40 < IMH / f < 1.26; and 0.21 < f2 / f1 < 2.35. This helps to achieve a more appropriate distribution of refractive power in the optical lens group, thereby reducing aberrations.

[0029] Alternatively, the optical lens group may contain a total of two lenses with refractive power.

[0030] The thickness of the first lens along the optical axis is CT1, and the thickness of the second lens along the optical axis is CT2, satisfying the condition: 0.62 < CT2 / CT1 < 6.97. This helps to ensure that the lens thickness meets the processing requirements of lens manufacturing while maintaining image quality.

[0031] The thickness of the first lens on the optical axis is CT1, and the displacement parallel to the optical axis from the intersection of the eye-side surface of the first lens with the optical axis to the position of the maximum effective radius of the eye-side surface of the first lens is TDP1, satisfying the following condition: 0.98 < CT1 / TDP1 < 5.79. This helps to achieve optimal performance and optimal assembly stability of the first lens.

[0032] The overall focal length of the optical lens group is f, and the focal length of the first lens is f1, satisfying the condition: 0.04 < f / f1 < 0.28. This helps to enhance the wide-angle characteristics of the optical lens group, provide a larger viewing angle, and maintain the illumination of the optical lens group.

[0033] The first lens has a radius of curvature of R1 on its eye-side surface and a focal length of f1, satisfying the condition: 0.33 < R1 / f1 < 0.76. This helps to effectively improve the distortion and reduce the aberrations of the optical lens group, and further reduce the lens size.

[0034] The overall focal length of the optical lens group is f, and the focal length of the second lens is f2, satisfying the condition: 0.07 < f / f2 < 0.30. This helps to enhance the wide-angle characteristics of the optical lens group, provide a larger viewing angle, and maintain the illumination of the optical lens group.

[0035] The second lens has a radius of curvature of R4 on its image source side surface and a focal length of f2, satisfying the condition: -1.20 < R4 / f2 < -0.22. This helps to effectively reduce image field curvature, improve the imaging quality of the optical lens group, and ensure lens shape retention.

[0036] The distance from the eye-side surface of the first lens to the image source surface on the optical axis is TL, and the radius of curvature of the eye-side surface of the first lens is R1, satisfying the following condition: 2.05 < R1 / TL < 12.83. This helps to maintain suitable lens shape properties.

[0037] The first lens has an Abbe number of vd1, the second lens has an Abbe number of vd2, and the first lens has a refractive index of nd1, satisfying the condition: 0.93 < (vd1*nd1) / vd2 < 2.16. This allows for a more suitable material combination between the first and second lenses, resulting in better image quality.

[0038] The first lens has a radius of curvature of R1 on its eye-side surface, and the second lens has a radius of curvature of R4 on its image-source-side surface, satisfying the condition: -2.74 < R1 / R4 < -0.54. This mutual constraint between the two radii of curvature helps prevent excessively small radii of curvature and reduces sensitivity to assembly tolerances.

[0039] The second lens has an eye-side surface radius of curvature of R3 and an image-source-side surface radius of curvature of R4, satisfying the condition: -0.83 < R4 / R3 < 0.49. This mutual constraint between the two radii of curvature helps prevent excessively small radii of curvature and reduces sensitivity to assembly tolerances.

[0040] The distance from the eye-side surface of the second lens to the image source surface on the optical axis is T2M, and the thickness of the second lens on the optical axis is CT2, satisfying the following condition: 0.68 < T2M / CT2 < 2.37. This helps to achieve a more appropriate balance between the lens shaping properties and refractive power of the second lens.

[0041] The distance from the eye-side surface of the first lens to the image source surface on the optical axis is TL, and the maximum image source height of the optical lens group is IMH, satisfying the following condition: 0.54 < TL / IMH < 1.80. This helps 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.

[0042] The second lens has a radius of curvature of R4 on its image source side surface and a refractive index of nd2, satisfying the condition: -116.45 < R4 / nd2 < -19.09. This helps to achieve an optimal balance between lens shapeability and performance when selecting second lenses made of different materials.

[0043] Alternatively, the image source side surface of the second lens may be convex near the optical axis.

[0044] Alternatively, the reflective portion of the transmissive element has an average light reflectance of at least 30% in the visible light range, preferably 50%.

[0045] Alternatively, the optical element may further include an anti-reflective coating that is closer to the image source side than the phase retardation element.

[0046] Alternatively, the overall focal length of the optical lens group is f, and the following condition must be met: 12.07mm < f < 38.00mm.

[0047] Alternatively, the maximum field of view of the optical lens group is FOV, and the following conditions must be met: 76.5 degrees < FOV < 132.0 degrees.

[0048] 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.

[0049] Alternatively, the maximum image source height of the optical lens group is IMH, and the following conditions must be met: 8.08mm < IMH < 29.63mm. Attached Figure Description

[0050] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0051] Figure 1A A schematic diagram of an optical lens group according to a first embodiment of the present invention is presented;

[0052] Figure 1B Presentation Figure 1A A magnified view of a portion of the image;

[0053] Figure 2 A schematic diagram of an optical lens group according to a second embodiment of the present invention is presented;

[0054] Figure 3 A schematic diagram of an optical lens group according to a third embodiment of the present invention is presented;

[0055] Figure 4 A schematic diagram of an optical lens group according to a fourth embodiment of the present invention is presented;

[0056] Figure 5 A schematic diagram of an optical lens group according to a fifth embodiment of the present invention is presented;

[0057] Figure 6 A schematic diagram of an optical lens group according to a sixth embodiment of the present invention is presented;

[0058] Figure 7 Presents a schematic diagram of an optical lens group according to a seventh embodiment of the present invention;

[0059] Figure 8 A schematic diagram of an optical lens group according to an eighth embodiment of the present invention is presented;

[0060] Figure 9 Presents a schematic diagram of an optical lens group according to a ninth embodiment of the present invention;

[0061] Figure 10 A schematic diagram showing the parameters and optical path according to the first embodiment of the present invention; and

[0062] Figure 11 A schematic diagram of a head-mounted electronic device according to an embodiment of the present invention is presented.

[0063] Symbol Explanation

[0064] 100, 200, 300, 400, 500, 600, 700, 800, 900: Aperture

[0065] 110, 210, 310, 410, 510, 610, 710, 810, 910: First lens

[0066] 111,211,311,411,511,611,711,811: Eye side surface

[0067] 112,212,312,412,512,612,712,812: Image source side surface

[0068] 120, 220, 320, 420, 520, 620, 720, 820, 920: Optical components

[0069] 121,221,321,421,521,621,721,821,921: Absorption polarizing element

[0070] 122,222,322,422,522,622,722,822,922: Reflective polarizing element

[0071] 123,223,323,423,523,623,723,823,923: First phase delay element

[0072] 130, 230, 330, 430, 530, 630, 730, 830, 930: Second lens

[0073] 131,231,331,431,531,631,731,831: Eye side surface

[0074] 132,232,332,432,532,632,732,832: Image source side surface

[0075] 140, 240, 340, 440, 540, 640, 740, 840, 940: Partially reflective and partially transmissive elements

[0076] 150, 250, 350, 450, 550, 650, 750, 850, 950: Second phase delay element

[0077] 160, 260, 360, 460, 560, 660, 760, 860, 960: Image source plane

[0078] 170, 270, 370, 470, 570, 670, 770, 870, 970: Image source

[0079] 180, 280, 380, 480, 580, 680, 780, 880, 980: Optical axis

[0080] 924: Anti-reflective coating

[0081] 10: Head-mounted electronic devices

[0082] 1001: Outer shell

[0083] 1002: Optomechanical Module

[0084] 1003: Image Source

[0085] 1004: Controller

[0086] IMH: Maximum image source height of the optical lens group

[0087] TL: The distance on the optical axis from the eye-side surface of the first lens to the image source surface.

[0088] T1M: Distance along the optical axis from the image source side surface of the first lens to the image source surface.

[0089] T2M: The distance on the optical axis from the eye-side surface of the second lens to the image source surface.

[0090] TDP1: The displacement parallel to the optical axis from the point where the eye-side surface of the first lens intersects the optical axis to the position of the maximum effective radius of the eye-side surface of the first lens.

[0091] L1: Optical path Detailed Implementation

[0092] The technical solutions of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0093] First Embodiment

[0094] Please refer to Figure 1A , Figure 1B and Figure 10 , Figure 1A A schematic diagram of an optical lens assembly according to a first embodiment of the present invention is presented. Figure 1B Presentation Figure 1A A magnified view of a portion of the image. Figure 10 A schematic diagram of the parameters and optical path according to the first embodiment of the present invention is presented. This optical lens assembly, along the optical axis 180 from the eye side to the image source side, sequentially includes an aperture 100, a first lens 110, an optical element 120, a second lens 130, a partially reflective and partially transmissive element 140, a second phase retardation element 150, and an image source surface 160. The total number of refractive lenses in the optical lens assembly is two, but not limited to this. The optical lens assembly can be used with an image source 170, and the image source surface 160 can be located on the image source 170. The image source 170 can be a liquid crystal display, an OLED display, or an LED display, but is not limited to these. The position of the aperture 100 can be the position where the user's eyes view the image.

[0095] The first lens 110 has positive refractive power, its eye-side surface 111 is convex near the optical axis, its image source-side surface 112 is planar near the optical axis, and the eye-side surface 111 is aspherical.

[0096] The optical element 120, from the eye side to the image source side, sequentially includes an absorptive polarizing element 121, a reflective polarizing element 122, and a first phase retardation element 123. These three elements are stacked (e.g., but not limited to, coated) on the image source side surface 112 of the first lens 110, and both opposite surfaces of these elements are planar. Specifically, the absorptive polarizing element 121 is attached to the image source side surface 112, the reflective polarizing element 122 is attached to the absorptive polarizing element 121, and the first phase retardation element 123 is attached to the reflective polarizing element 122. The first phase retardation element 123 is, for example, but not limited to, a quarter-wave plate.

[0097] The second lens 130 has positive refractive power, its eye-side surface 131 is convex near the optical axis, its image-source side surface 132 is convex near the optical axis, and the eye-side surface 131 is spherical and the image-source side surface 132 is aspherical.

[0098] A partially reflective and partially transmissive element 140 is disposed (e.g., but not limited to, coated) on the image source side surface 132 of the second lens 130, and has an average light reflectance of at least 30%, preferably 50%, in the visible light range. Here, the average light reflectance refers to the average value of the reflectance of the partially reflective and partially transmissive element 140 for light of different wavelengths.

[0099] The second phase delay 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.

[0100] The equations for the aspherical surfaces of the above lenses are expressed as follows:

[0101]

[0102] Where 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 near the optical axis, and is the reciprocal of the radius of curvature (R) (c = 1 / R), where R is the radius of curvature of the lens surface near the optical axis; h is the vertical distance of the lens surface from the optical axis 180; k is the conic constant; and Ai is the i-th order aspherical coefficient.

[0103] 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 diameter of the optical lens group is EPD, the aperture value (f-number) of the optical lens group 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, the distance from the eye-side surface 131 of the second 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 radius of curvature of the eye-side surface 111 of the first lens 110 is R1, and the radius of curvature of the image source-side surface 112 of the first lens 110 is R1. The radius of curvature of the eye-side surface 131 of the second lens 130 is R2, the radius of curvature of the image source-side surface 132 of the second lens 130 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, 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), and the displacement of the point where the eye-side surface 111 of the first lens 110 intersects 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 below.

[0104]

[0105] 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 is satisfied: IMH / f = 0.78.

[0106] 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 is satisfied: f2 / f1 = 0.55.

[0107] 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 condition is satisfied: CT2 / CT1 = 1.23.

[0108] 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 displacement of the point where the eye-side surface 111 of the first lens 110 intersects 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, and the following condition is satisfied: CT1 / TDP1=4.14.

[0109] 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 is satisfied: f / f1 = 0.11.

[0110] In the optical lens group of the first embodiment, the radius of curvature 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 is satisfied: R1 / f1 = 0.55.

[0111] 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 is satisfied: f / f2 = 0.20.

[0112] 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 focal length of the second lens 130 is f2, and the following condition is satisfied: R4 / f2=-0.74.

[0113] 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 radius of curvature of the eye-side surface 111 of the first lens 110 is R1, and the following condition is satisfied: R1 / TL = 7.08.

[0114] 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 condition is satisfied: (vd1*nd1) / vd2=1.54.

[0115] In the optical lens group of the first embodiment, the radius of curvature of the eye-side surface 111 of the first lens 110 is R1, the radius of curvature of the image source-side surface 132 of the second lens 130 is R4, and the following condition is satisfied: R1 / R4 = -1.34.

[0116] In the optical lens group of the first embodiment, the radius of curvature of the eye-side surface of the second lens 130 is R3, the radius of curvature of the image source-side surface 132 of the second lens 130 is R4, and the following condition is satisfied: R4 / R3 = -0.36.

[0117] 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 the following condition is satisfied: T2M / CT2 = 1.23.

[0118] 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 condition is satisfied: TL / IMH = 0.90.

[0119] 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 is satisfied: R4 / nd2 = -83.18.

[0120] Furthermore, the optical lens group of the first embodiment, through a combination of absorptive polarizing elements, reflective polarizing elements, phase retardation elements, and lenses, utilizes the transmission and reflection of light to fold the optical path without affecting image quality, thereby compressing the length of the lens group required for imaging. Please refer to... Figure 10 As shown, linearly polarized incident light emitted from image source 170 travels along optical path L1 to the user's eye. Specifically, when this linearly polarized incident light passes through the second phase retardation element 150, it changes from a linearly polarized state to a circularly polarized state. A portion of the circularly polarized incident light is transmitted as light through the partially reflective transmission element 140 and enters the second lens 130, where it is refracted by the second lens 130 to the first phase retardation element 123. This transmitted light changes from a circularly polarized state to a linearly polarized state the first time it passes through the first phase retardation element 123, and has a polarization direction parallel to the reflection axis of the reflective polarizing element 122. Then, this linearly polarized transmitted light is reflected by the reflective polarizing element 122, and passes through the first phase retardation element 123 a second time to return to a linearly polarized state. The polarization state is converted back to circular polarization. Then, after passing through the second lens 130, part of the transmitted light, which is now circularly polarized again, is reflected back to the second lens 130 by the partial reflection and partial transmission element 140, and travels to the first phase retardation element 123 after passing through the second lens 130. When the reflected light passes through the first phase retardation element 123, it is converted from circular polarization to linear polarization and has a polarization direction perpendicular to the reflection axis of the reflective polarizing element 122. Finally, the linearly polarized reflected light is refracted to the user's eye by the first lens 110 after passing through the reflective polarizing element 122 and the absorptive polarizing element 121.

[0121] Please also refer to Table 2 and Table 3 below.

[0122]

[0123]

[0124]

[0125] Table 2 shows the detailed structural data of the first embodiment. The units for radius of curvature, thickness, gap, and focal length are mm. Surfaces 18 to 0 represent the surfaces through which light passes sequentially from the image source surface 160 to the aperture 100. Surface 0 is the gap between the user's eye (or aperture 100) and the image on the optical axis 180, and the image position is further away 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 180. Surfaces 2, 3, and 17 are the thicknesses of the first lens 110, the absorptive polarizing element 121, and the second phase retardation element 150 on the optical axis 180, respectively. Surfaces 4, 11, and 12 are the thicknesses of the reflective polarizing element 122 on the optical axis 180. Surfaces 5, 10, and 13 are the thicknesses of the first lens 110, the absorptive polarizing element 121, and the second phase retardation element 150 on the optical axis 180, respectively. The thickness of the phase retardation element 123 on the optical axis 180; surface 6 is the gap between the first phase retardation element 123 and the second lens 130 on the optical axis 180; surfaces 7 and 15 are the thickness of the second lens 130 on the optical axis 180; surface 8 is the thickness of the partially reflective and partially transmissive element 140 on the optical axis 180 (the negative sign indicates light reflection propagation); surface 9 is the gap between the partially reflective and partially transmissive element 140 and the first phase retardation element 123 on the optical axis 180 (the negative sign indicates light reflection propagation); surface 14 is the gap between the first phase retardation element 123 and the second lens 130 on the optical axis 180; surface 16 is the gap between the second lens 130 and the second phase retardation element 150 on the optical axis 180. In the table, positive values ​​represent gaps and thicknesses with the light direction towards the viewer, while negative values ​​represent gaps and thicknesses with the light direction towards the image source surface 160. The light travel direction can be referenced. Figure 10 The optical path L1 is shown.

[0126] Table 3 shows the aspherical data in the first embodiment, where: k is the conic coefficient in the aspherical curve equation, and A2, A4, A6, A8, A10, A12, A14, A16, A18 and A20 are higher-order aspherical coefficients.

[0127] Furthermore, the tables in the following embodiments are schematic diagrams corresponding to each embodiment. The definitions of the data in the tables are the same as those in Tables 1 to 3 of the first embodiment, and will not be repeated here. In addition, in each embodiment, the maximum effective radius of any surface of the lens is usually the perpendicular distance between the point where the incident light rays at the maximum angle of view of the optical lens group pass through the outermost edge of the entrance pupil and the optical axis on the lens surface, or it can be the radius of the part of the lens surface that does not have surface treatment (the lens surface has a concave-convex structure, or is coated with ink, etc.), or it can be the radius of the part of the lens through which light can pass (a light shield, or a spacer ring, etc. can block light from passing through the lens), but it is not limited to these.

[0128] Second Embodiment

[0129] Please refer to Figure 2 The schematic diagram shown is of an optical lens assembly according to a second embodiment of the present invention. This optical lens assembly, along the optical axis 280 from the eye side to the image source side, sequentially includes an aperture 200, a first lens 210, an optical element 220, a second lens 230, a partially reflective and partially transmissive element 240, a second phase retardation element 250, and an image source surface 260. The total number of refractive lenses in the optical lens assembly is two, but not limited to this. The optical lens assembly can be used with an image source 270, and the image source surface 260 can be located on the image source 270. The image source 270 can be a liquid crystal display, an OLED display, or an LED display, but is not limited to these. The position of the aperture 200 can be the position where the user's eyes view the image.

[0130] The first lens 210 has positive refractive power, its eye-side surface 211 is convex near the optical axis, its image source-side surface 212 is planar near the optical axis, and the eye-side surface 211 is aspherical.

[0131] The optical element 220, from the eye side to the image source side, sequentially includes an absorptive polarizing element 221, a reflective polarizing element 222, and a first phase retardation element 223. These three elements are stacked (e.g., but not limited to, coated) on the image source side surface 212 of the first lens 210, and both opposing surfaces of these elements are planar. Specifically, the absorptive polarizing element 221 is attached to the image source side surface 212, the reflective polarizing element 222 is attached to the absorptive polarizing element 221, and the first phase retardation element 223 is attached to the reflective polarizing element 222. The first phase retardation element 223 is, for example, but not limited to, a quarter-wave plate.

[0132] The second lens 230 has positive refractive power, its eye-side surface 231 is concave near the optical axis, its image-source side surface 232 is convex near the optical axis, and the eye-side surface 231 is spherical and the image-source side surface 232 is aspherical.

[0133] A partially reflective and partially transmissive element 240 is disposed (e.g., but not limited to, coated) on the image source side surface 232 of the second lens 230, and has an average light reflectance of at least 30%, preferably 50%, in the visible light range. Here, the average light reflectance refers to the average value of the reflectance of the partially reflective and partially transmissive element 240 for light of different wavelengths.

[0134] The second phase delay 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.

[0135] Please also refer to Tables 4 to 7 below.

[0136]

[0137]

[0138]

[0139]

[0140]

[0141]

[0142] In the second embodiment, the curve equation of the aspherical surface is the same as that of the aspherical surface in the first embodiment. The values ​​of each parameter in Table 6 can be derived from Tables 4 and 5, and the values ​​of each condition in Table 7 can be derived from Table 6.

[0143] Third Embodiment

[0144] Please refer to Figure 3 The schematic diagram shown is of an optical lens assembly according to a third embodiment of the present invention. This optical lens assembly, along the optical axis 380 from the eye side to the image source side, sequentially includes an aperture 300, a first lens 310, an optical element 320, a second lens 330, a partially reflective and partially transmissive element 340, a second phase retardation element 350, and an image source surface 360. The total number of refractive lenses in the optical lens assembly is two, but not limited to this. The optical lens assembly can be used with an image source 370, and the image source surface 360 ​​can be located on the image source 370. The image source 370 can be a liquid crystal display, an OLED display, or an LED display, but is not limited to these types. The position of the aperture 300 can be the position where the user's eye views the image.

[0145] The first lens 310 has positive refractive power, its eye-side surface 311 is convex near the optical axis, its image source-side surface 312 is planar near the optical axis, and the eye-side surface 311 is aspherical.

[0146] The optical element 320, from the eye side to the image source side, sequentially includes an absorptive polarizing element 321, a reflective polarizing element 322, and a first phase retardation element 323. These three elements are stacked (e.g., but not limited to, coated) on the image source side surface 312 of the first lens 310, and both opposing surfaces of these elements are planar. Specifically, the absorptive polarizing element 321 is attached to the image source side surface 312, the reflective polarizing element 322 is attached to the absorptive polarizing element 321, and the first phase retardation element 323 is attached to the reflective polarizing element 322. The first phase retardation element 323 is, for example, but not limited to, a quarter-wave plate.

[0147] The second lens 330 has positive refractive power, its eye-side surface 331 is flat near the optical axis, its image-source-side surface 332 is convex near the optical axis, and the image-source-side surface 332 is aspherical.

[0148] A partially reflective and partially transmissive element 340 is disposed (e.g., but not limited to, coated) on the image source side surface 332 of the second lens 330, and has an average light reflectance of at least 30%, preferably 50%, in the visible light range. Here, the average light reflectance refers to the average value of the reflectance of the partially reflective and partially transmissive element 340 for light of different wavelengths.

[0149] The second phase delay element 350 is disposed between the partially reflective and partially transmissive 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.

[0150] Please also refer to Tables 8 to 11 below.

[0151]

[0152]

[0153]

[0154]

[0155] In the third embodiment, the curve equation of the aspherical surface is the same as that of the aspherical surface in the first embodiment. The values ​​of each parameter in Table 10 can be derived from Tables 8 and 9, and the values ​​of each condition in Table 11 can be derived from Table 10.

[0156] Fourth embodiment

[0157] Please refer to Figure 4The schematic diagram shown is of an optical lens assembly according to a fourth embodiment of the present invention. This optical lens assembly, along the optical axis 480 from the eye side to the image source side, sequentially includes an aperture 400, a first lens 410, an optical element 420, a second lens 430, a partially reflective and partially transmissive element 440, a second phase retardation element 450, and an image source surface 460. The total number of refractive lenses in the optical lens assembly is two, but not limited to this. The optical lens assembly can be used with an image source 470, and the image source surface 460 can be located on the image source 470. The image source 470 can be a liquid crystal display, an OLED display, or an LED display, but is not limited to these. The position of the aperture 400 can be the position where the user's eyes view the image.

[0158] The first lens 410 has positive refractive power, its eye-side surface 411 is convex near the optical axis, its image source-side surface 412 is planar near the optical axis, and the eye-side surface 411 is aspherical.

[0159] The optical element 420, from the eye side to the image source side, sequentially includes an absorptive polarizing element 421, a reflective polarizing element 422, and a first phase retardation element 423. These three elements are stacked (e.g., but not limited to, coated) on the image source side surface 412 of the first lens 410, and both opposing surfaces of these elements are planar. Specifically, the absorptive polarizing element 421 is attached to the image source side surface 412, the reflective polarizing element 422 is attached to the absorptive polarizing element 421, and the first phase retardation element 423 is attached to the reflective polarizing element 422. The first phase retardation element 423 is, for example, but not limited to, a quarter-wave plate.

[0160] The second lens 430 has positive refractive power, its eye-side surface 431 is convex near the optical axis, its image-source side surface 432 is convex near the optical axis, and both the eye-side surface 431 and the image-source side surface 432 are aspherical.

[0161] A partially reflective and partially transmissive element 440 is disposed (e.g., but not limited to, coated) on the image source side surface 432 of the second lens 430, and has an average light reflectance of at least 30%, preferably 50%, in the visible light range. Here, the average light reflectance refers to the average value of the reflectance of the partially reflective and partially transmissive element 440 for light of different wavelengths.

[0162] The second phase delay element 450 is disposed between the partially reflective and partially transmissive 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.

[0163] Please also refer to Tables 12 to 15 below.

[0164]

[0165]

[0166]

[0167]

[0168] In the fourth embodiment, the curve equation of the aspherical surface is the same as that of the aspherical surface in the first embodiment. The values ​​of each parameter in Table 14 can be derived from Tables 12 and 13, and the values ​​of each condition in Table 15 can be derived from Table 14.

[0169] Fifth embodiment

[0170] Please refer to Figure 5 The schematic diagram shown is of an optical lens assembly according to a fifth embodiment of the present invention. This optical lens assembly, along the optical axis 580 from the eye side to the image source side, sequentially includes an aperture 500, a first lens 510, an optical element 520, a second lens 530, a partially reflective and partially transmissive element 540, a second phase retardation element 550, and an image source surface 560. The total number of refractive lenses in the optical lens assembly is two, but not limited to this. The optical lens assembly can be used with an image source 570, and the image source surface 560 can be located on the image source 570. The image source 570 can be a liquid crystal display, an OLED display, or an LED display, but is not limited to these. The position of the aperture 500 can be the position where the user's eyes view the image.

[0171] The first lens 510 has positive refractive power, its eye-side surface 511 is convex near the optical axis, its image source-side surface 512 is flat near the optical axis, and the eye-side surface 511 is aspherical.

[0172] The optical element 520, from the eye side to the image source side, sequentially includes an absorptive polarizing element 521, a reflective polarizing element 522, and a first phase retardation element 523. These three elements are stacked (e.g., but not limited to, coated) on the image source side surface 512 of the first lens 510, and both opposing surfaces of these elements are planar. Specifically, the absorptive polarizing element 521 is attached to the image source side surface 512, the reflective polarizing element 522 is attached to the absorptive polarizing element 521, and the first phase retardation element 523 is attached to the reflective polarizing element 522. The first phase retardation element 523 is, for example, but not limited to, a quarter-wave plate.

[0173] The second lens 530 has positive refractive power, its eye-side surface 531 is convex near the optical axis, its image-source side surface 532 is convex near the optical axis, and both the eye-side surface 531 and the image-source side surface 532 are aspherical.

[0174] A partially reflective and partially transmissive element 540 is disposed (e.g., but not limited to, coated) on the image source side surface 532 of the second lens 530, and has an average light reflectance of at least 30%, preferably 50%, in the visible light range. Here, the average light reflectance refers to the average reflectance of the partially reflective and partially transmissive element 540 for different wavelengths of light.

[0175] The second phase delay element 550 is disposed between the partially reflective and partially transmissive 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.

[0176] Please also refer to Tables 16 to 19 below.

[0177]

[0178]

[0179]

[0180]

[0181]

[0182]

[0183] In the fifth embodiment, the curve equation of the aspherical surface is the same as that of the aspherical surface in the first embodiment. The values ​​of each parameter in Table 18 can be derived from Tables 16 and 17, and the values ​​of each condition in Table 19 can be derived from Table 18.

[0184] Sixth Embodiment

[0185] Please refer to Figure 6 The schematic diagram shown is of an optical lens assembly according to a sixth embodiment of the present invention. This optical lens assembly, along the optical axis 680 from the eye side to the image source side, sequentially includes an aperture 600, a first lens 610, an optical element 620, a second lens 630, a partially reflective and partially transmissive element 640, a second phase retardation element 650, and an image source surface 660. The total number of refractive lenses in the optical lens assembly is two, but not limited to this. The optical lens assembly can be used with an image source 670, and the image source surface 660 can be located on the image source 670. The image source 670 can be a liquid crystal display, an OLED display, or an LED display, but is not limited to these. The position of the aperture 600 can be the position where the user's eye views the image.

[0186] The first lens 610 has positive refractive power, its eye-side surface 611 is convex near the optical axis, its image source-side surface 612 is planar near the optical axis, and the eye-side surface 611 is aspherical.

[0187] The optical element 620, from the eye side to the image source side, sequentially includes an absorptive polarizing element 621, a reflective polarizing element 622, and a first phase retardation element 623. These three elements are stacked (e.g., but not limited to, coated) on the image source side surface 612 of the first lens 610, and both opposing surfaces of these elements are planar. Specifically, the absorptive polarizing element 621 is attached to the image source side surface 612, the reflective polarizing element 622 is attached to the absorptive polarizing element 621, and the first phase retardation element 623 is attached to the reflective polarizing element 622. The first phase retardation element 623 is, for example, but not limited to, a quarter-wave plate.

[0188] The second lens 630 has positive refractive power, its eye-side surface 631 is convex near the optical axis, its image-source side surface 632 is convex near the optical axis, and both the eye-side surface 631 and the image-source side surface 632 are aspherical.

[0189] A partially reflective and partially transmissive element 640 is disposed (e.g., but not limited to, coated) on the image source side surface 632 of the second lens 630, and has an average light reflectance of at least 30%, preferably 50%, in the visible light range. Here, the average light reflectance refers to the average reflectance of the partially reflective and partially transmissive element 640 for different wavelengths of light.

[0190] The second phase delay 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.

[0191] Please also refer to Tables 20 to 23 below.

[0192]

[0193]

[0194]

[0195]

[0196]

[0197] In the sixth embodiment, the curve equation of the aspherical surface is the same as that of the aspherical surface in the first embodiment. The values ​​of each parameter in Table 22 can be derived from Tables 20 and 21, and the values ​​of each condition in Table 23 can be derived from Table 22.

[0198] Seventh Embodiment

[0199] Please refer to Figure 7The schematic diagram shown is of an optical lens assembly according to a seventh embodiment of the present invention. This optical lens assembly, along the optical axis 780 from the eye side to the image source side, sequentially includes an aperture 700, a first lens 710, an optical element 720, a second lens 730, a partially reflective and partially transmissive element 740, a second phase retardation element 750, and an image source surface 760. The total number of refractive lenses in the optical lens assembly is two, but not limited to this. The optical lens assembly can be used with an image source 770, and the image source surface 760 can be located on the image source 770. The image source 770 can be a liquid crystal display, an OLED display, or an LED display, but is not limited to these types. The position of the aperture 700 can be the position where the user's eye views the image.

[0200] The first lens 710 has positive refractive power, its eye-side surface 711 is convex near the optical axis, its image source-side surface 712 is planar near the optical axis, and the eye-side surface 711 is aspherical.

[0201] The optical element 720, from the eye side to the image source side, sequentially includes an absorptive polarizing element 721, a reflective polarizing element 722, and a first phase retardation element 723. These three elements are stacked (e.g., but not limited to, coated) on the image source side surface 712 of the first lens 710, and both opposing surfaces of these elements are planar. Specifically, the absorptive polarizing element 721 is attached to the image source side surface 712, the reflective polarizing element 722 is attached to the absorptive polarizing element 721, and the first phase retardation element 723 is attached to the reflective polarizing element 722. The first phase retardation element 723 is, for example, but not limited to, a quarter-wave plate.

[0202] The second lens 730 has positive refractive power, its eye-side surface 731 is convex near the optical axis, its image-source-side surface 732 is convex near the optical axis, and both the eye-side surface 731 and the image-source-side surface 732 are aspherical.

[0203] A partially reflective and partially transmissive element 740 is disposed (e.g., but not limited to, coated) on the image source side surface 732 of the second lens 730, and has an average light reflectance of at least 30%, preferably 50%, in the visible light range. Here, the average light reflectance refers to the average value of the reflectance of the partially reflective and partially transmissive element 740 for light of different wavelengths.

[0204] The second phase delay 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.

[0205] Please also refer to Tables 24 to 27 below.

[0206]

[0207]

[0208]

[0209]

[0210]

[0211]

[0212] In the seventh embodiment, the curve equation of the aspherical surface is the same as that of the aspherical surface in the first embodiment. The values ​​of each parameter in Table 26 can be derived from Tables 24 and 25, and the values ​​of each condition in Table 27 can be derived from Table 26.

[0213] Eighth embodiment

[0214] Please refer to Figure 8 The schematic diagram shown is of an optical lens assembly according to an eighth embodiment of the present invention. This optical lens assembly, along the optical axis 880 from the eye side to the image source side, sequentially includes an aperture 800, a first lens 810, an optical element 820, a second lens 830, a partially reflective and partially transmissive element 840, a second phase retardation element 850, and an image source surface 860. The total number of refractive lenses in the optical lens assembly is two, but not limited to this. The optical lens assembly can be used with an image source 870, and the image source surface 860 can be located on the image source 870. The image source 870 can be a liquid crystal display, an OLED display, or an LED display, but is not limited to these types. The position of the aperture 800 can be the position where the user's eye views the image.

[0215] The first lens 810 has positive refractive power, its eye-side surface 811 is convex near the optical axis, its image source-side surface 812 is planar near the optical axis, and the eye-side surface 811 is aspherical.

[0216] The optical element 820, from the eye side to the image source side, sequentially includes an absorptive polarizing element 821, a reflective polarizing element 822, and a first phase retardation element 823. These three elements are stacked (e.g., but not limited to, coated) on the image source side surface 812 of the first lens 810, and both opposing surfaces of these elements are planar. Specifically, the absorptive polarizing element 821 is attached to the image source side surface 812, the reflective polarizing element 822 is attached to the absorptive polarizing element 821, and the first phase retardation element 823 is attached to the reflective polarizing element 822. The first phase retardation element 823 is, for example, but not limited to, a quarter-wave plate.

[0217] The second lens 830 has positive refractive power, its eye-side surface 831 is convex near the optical axis, its image-source side surface 832 is convex near the optical axis, and both the eye-side surface 831 and the image-source side surface 832 are aspherical.

[0218] A partially reflective and partially transmissive element 840 is disposed (e.g., but not limited to, coated) on the image source side surface 832 of the second lens 830, and has an average light reflectance of at least 30%, preferably 50%, in the visible light range. Here, the average light reflectance refers to the average reflectance of the partially reflective and partially transmissive element 840 for different wavelengths of light.

[0219] The second phase delay 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.

[0220] Please also refer to Tables 28 to 31 below.

[0221]

[0222]

[0223]

[0224]

[0225]

[0226]

[0227] In the eighth embodiment, the curve equation of the aspherical surface is the same as that of the aspherical surface in the first embodiment. The values ​​of each parameter in Table 30 can be derived from Tables 28 and 29, and the values ​​of each condition in Table 31 can be derived from Table 30.

[0228] Ninth Embodiment

[0229] Please refer to Figure 9 The schematic diagram shown is of an optical lens assembly according to a ninth embodiment of the present invention. This optical lens assembly, along the optical axis 980 from the eye side to the image source side, sequentially includes an aperture 900, a first lens 910, an optical element 920, a second lens 930, a partially reflective and partially transmissive element 940, a second phase retardation element 950, and an image source surface 960. The total number of refractive lenses in the optical lens assembly is two, but not limited to this. The optical lens assembly can be used with an image source 970. The optical element 920, from the eye side to the image source side, sequentially includes an absorptive polarizing element 921, a reflective polarizing element 922, and a first phase retardation element 923.

[0230] The configuration of the aperture 900, the first lens 910, the absorptive polarizing element 921, the reflective polarizing element 922, the first phase retardation element 923, the second lens 930, the partially reflective and partially transmissive element 940, the second phase retardation element 950, the image source surface 960, and the image source 970 can be the same as the configuration of the aperture, the first lens, the absorptive polarizing element, the reflective polarizing element, the first phase retardation element, the second lens, the partially reflective and partially transmissive element, the second phase retardation element, the image source surface, and the image source in any of the first to eighth embodiments, and will not be described again here.

[0231] The optical element 920 further includes an anti-reflective film 924, which is closer to the image source side than the first phase delay element 923 and can be stacked (e.g., but not limited to, a film) on the first phase delay element 923, with both of its surfaces being planar.

[0232] The optical lens assembly provided by this invention allows the lenses to be made of either plastic or glass. Using plastic effectively reduces production costs, while using glass increases the freedom of refractive power configuration. Furthermore, the aspherical lens surfaces in the optical lens assembly can be fabricated into shapes other than spherical to obtain more control variables and reduce aberrations, thereby reducing the number of lenses used and effectively lowering the overall length of the optical lens assembly.

[0233] In the optical lens assembly provided by the present invention, taking a lens with refractive power as an example, if the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex near the optical axis; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave near the optical axis.

[0234] Furthermore, the optical lens assembly provided by this invention can be applied to head-mounted electronic devices. Please refer to [link / reference]. Figure 11 The diagram shown is a schematic of a head-mounted electronic device according to an embodiment of the present invention. This head-mounted electronic device 10 is, for example, but not limited to, a head-mounted display that uses virtual reality (VR) technology, and includes a housing 1001 and an optical engine module 1002, an image source 1003, and a controller 1004 disposed within the housing 1001.

[0235] The optical engine module 1002 corresponds to the user's left and right eyes respectively. The optical engine module 1002 includes an optical lens group, and this optical lens group can be any of the optical lens groups in the first embodiment to the ninth embodiment.

[0236] The image source 1003 can be any of the first to ninth embodiments. The image source 1003 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.

[0237] The controller 1004 is electrically connected to the image source 1003 to control the image source 1003 to display images, thereby enabling the head-mounted electronic device 10 to project stereoscopic images onto the user's eyes and form virtual images.

[0238] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An optical lens assembly, characterized in that, From the eye side to the image source side, the following are included in sequence: The first lens has positive refractive power, and the eye-side surface of the first lens is convex near the optical axis; The optical elements, from the eye side to the image source side, sequentially include an absorptive polarizing element, a reflective polarizing element, and a first phase retardation element; The second lens has positive refractive power, and the image source side surface of the second lens is convex near the optical axis. At least one of the eye side surface and the image source side surface of the second lens is aspherical. Partially reflective and partially transmissive elements; Second phase delay element; as well as Like the source surface; The optical lens group comprises two lenses with refractive power. 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, the thickness of the first lens on the optical axis is CT1, and the displacement 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 is TDP1, satisfying the following conditions: 0.40 < IMH / f < 1.26; 0.98 < CT1 / TDP1 < 5.79; and 0.21 < f2 / f1 < 2.

35.

2. The optical lens assembly as described in claim 1, characterized in that, The thickness of the first lens on the optical axis is CT1, and the thickness of the second lens on the optical axis is CT2, satisfying the following condition: 0.62 < CT2 / CT1 < 6.

97.

3. The optical lens assembly as described in claim 1, characterized in that, The overall focal length of the optical lens group is f, and the focal length of the first lens is f1, satisfying the following condition: 0.04 < f / f1 < 0.

28.

4. The optical lens assembly as described in claim 1, characterized in that, The first lens has a radius of curvature of R1 on the eye side surface and a focal length of f1, satisfying the following condition: 0.33 < R1 / f1 < 0.

76.

5. The optical lens assembly as described in claim 1, characterized in that, The overall focal length of the optical lens group is f, and the focal length of the second lens is f2, satisfying the following condition: 0.07 < f / f2 < 0.

30.

6. The optical lens assembly as described in claim 1, characterized in that, The second lens has a radius of curvature of R4 on the image source side surface and a focal length of f2, satisfying the following condition: -1.20 < R4 / f2 < -0.

22.

7. The optical lens assembly as described in claim 1, characterized in that, The distance from the eye-side surface of the first lens to the image source surface on the optical axis is TL, and the radius of curvature of the eye-side surface of the first lens is R1, satisfying the following condition: 2.05 < R1 / TL < 12.

83.

8. The optical lens assembly as described in claim 1, characterized in that, 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 condition is satisfied: 0.93 < (vd1*nd1) / vd2 < 2.

16.

9. The optical lens assembly as described in claim 1, characterized in that, The radius of curvature of the eye-side surface of the first lens is R1, and the radius of curvature of the image-source-side surface of the second lens is R4, satisfying the following condition: -2.74 < R1 / R4 < -0.

54.

10. The optical lens assembly as claimed in claim 1, characterized in that, The radius of curvature of the eye-side surface of the second lens is R3, and the radius of curvature of the image-source-side surface of the second lens is R4, satisfying the following condition: -0.83 < R4 / R3 < 0.

49.

11. The optical lens assembly as claimed in claim 1, characterized in that, The distance from the eye side surface of the second lens to the image source surface on the optical axis is T2M, and the thickness of the second lens on the optical axis is CT2, satisfying the following condition: 0.68 < T2M / CT2 < 2.

37.

12. The optical lens assembly as claimed in claim 1, characterized in that, 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 condition is satisfied: 0.54 < TL / IMH < 1.

80.

13. The optical lens assembly as claimed in claim 1, characterized in that, The second lens has a radius of curvature of R4 on the image source side surface and a refractive index of nd2, satisfying the following condition: -116.45 < R4 / nd2 < -19.

09.

14. A head-mounted electronic device, characterized in that, Include: shell; The optical lens assembly as described in any one of claims 1 to 13 is disposed within the housing; An image source is disposed within the housing and on the image source surface of the optical lens group; and The controller is housed within the housing and is electrically connected to the image source.

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