Optical lens group and electronic device

Abstract

The invention provides an optical lens group. The optical lens group comprises a reflective polarizing element; a phase delay element; the first lens, the second lens, the third lens, the partial reflection and partial transmission element and the fourth lens are sequentially arranged from the eye side to the image source side. The reflective polarization element is located between the first lens and the second lens, and the phase delay element is located between the reflective polarization element and the partial reflection and partial transmission element. When specific conditions are satisfied, weight can be reduced and imaging quality can be ensured.

Description

Technical Field

[0001] The present invention relates to an optical lens assembly and an electronic device, and in particular to an optical lens assembly applicable to an electronic device (such as but not limited to a head-mounted electronic device). Background Art

[0002] With the development of the semiconductor industry, the functions of various consumer electronic products are becoming increasingly powerful, and the emergence of various services on the software application side has given consumers more choices. When the market is no longer satisfied with handheld electronic products, virtual reality (VR) technology came into being. Today, the application of virtual reality has opened up a new blue ocean for the market of consumer electronic products, and in the application scenarios of virtual reality, the first project to achieve commercialization is head-mounted display.

[0003] However, current head mounted displays have problems of heavy weight and poor image quality. Summary of the invention

[0004] Therefore, an object of the present invention is to provide an optical lens assembly and an electronic device, which can reduce the number of lenses by folding the optical path, thereby reducing the weight of the device and providing better imaging quality.

[0005] According to one embodiment of the present invention, an optical lens assembly is provided, comprising: a reflective polarizing element; a phase delay element; and a first lens with positive refractive power, a second lens with refractive power, a third lens with refractive power and a convex surface on the image source side, a partially reflective and partially transmissive element, and a fourth lens with refractive power, which are sequentially included from the eye side to the image source side. The reflective polarizing element is located between the first lens and the second lens, and the phase delay element is located between the reflective polarizing element and the partially reflective and partially transmissive element.

[0006] In the optical lens group, the overall focal length of the optical lens group is f, the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the maximum effective radius of the eye-side surface of the first lens is CA1, the maximum effective radius of the image source-side surface of the second lens is CA4, the thickness of the first lens on the optical axis is CT1, the thickness of the second lens on the optical axis is CT2, the thickness of the third lens on the optical axis is CT3, the thickness of the fourth lens on the optical axis is CT4, 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 first lens is R2, the eye-side surface of the third lens is The curvature radius of the surface is R5, the curvature radius of the image source side surface of the third lens is R6, the curvature radius of the eye side surface of the fourth lens is R7, the absolute value of the displacement from the intersection of the eye side surface of the first lens on the optical axis to the maximum effective radius position of the eye side surface of the first lens parallel to the optical axis is TDP1, the absolute value of the displacement from the intersection of the eye side surface of the second lens on the optical axis to the maximum effective radius position of the eye side surface of the second lens parallel to the optical axis is TDP3, the absolute value of the displacement from the intersection of the image source side surface of the third lens on the optical axis to the maximum effective radius position of the image source side surface of the third lens parallel to the optical axis is TDP6, and at least one of the following conditions is met:

[0007] 0.37<CT3 / TDP6<5.39;

[0008] 4.42<CA1 / TDP1<41.58;

[0009] -1.92<f3 / R6<8.96;

[0010] 2.61<f1 / f<25.10;

[0011] -106.00<f2 / CT2<19.81;

[0012] -120.81<(f3 / CT3)+(f4 / CT4)<158.75;

[0013] 7.80<f1 / CT1<256.47;

[0014] -7.72<(f2 / CT1)+(f1 / CT2)<100.65;

[0015] -1.28<fl / f2<7.37;

[0016] 4.88<R5*R6 / (f2*CT2)<40.13;

[0017] 5.29<R7 / CT4<78.07;

[0018] 2.58<CA4 / (TDP3+TDP61<10.54;

[0019] 5.27<R1 / CT1<139.95;

[0020] 10.14mm<(CT4*f1) / (CT2+CT3)<278.32mm

[0021] 0.27<R1 / f1<1.33;

[0022] -5.69mm<(R1 / R21*CT1<1.16mm; and

[0023] -1.07<R6 / R5<2.24.

[0024] When 0.37<CT3 / TDP6<5.39 is satisfied, it helps to optimize the imaging quality, performance, modulation transfer function (MTF) and assembly stability of the third lens.

[0025] When 4.42<CA1 / TDP1<41.58 is satisfied, it helps to achieve the goal of a wide viewing angle and optimize the formability of the first lens.

[0026] When -1.92<f3 / R6<8.96 is satisfied, it is helpful to effectively correct the aberration on the image source side by adjusting the curvature radius of the image source side surface of the third lens.

[0027] When 2.61<f1 / f<25.10 is satisfied, it helps to enhance the wide-angle characteristic of the optical lens group, provide a larger viewing angle, and maintain the illumination of the optical lens group.

[0028] When -106.00<f2 / CT2<19.81 is satisfied, it helps to achieve a proper balance between the refractive power and the thickness of the second lens.

[0029] When -120.81<(f3 / CT3)+(f4 / CT4)<158.75 is satisfied, it helps to enhance the wide-angle characteristic of the optical lens group, provide a larger viewing angle, and maintain the illumination of the optical lens group.

[0030] When 7.80<f1 / CT1<256.47 is satisfied, it helps to make the refractive power distribution of the optical lens group more appropriate, thereby reducing aberrations.

[0031] When -7.72<(f2 / CT1)+(f1 / CT2)<100.65 is satisfied, it helps to achieve an appropriate balance between the thickness and the refractive power of the first lens and the second lens.

[0032] When -1.28<f1 / f2<7.37 is satisfied, it helps to make the refractive power distribution of the optical lens group more appropriate, thereby reducing aberrations.

[0033] When 4.88<R5*R6 / ff2*CT2)<40.13 is satisfied, the two curvature radii are mutually restricted, which helps to prevent the curvature radius from being too small and reduce assembly tolerance and sensitivity.

[0034] When 5.29<R7 / CT4<78.07 is satisfied, it helps to achieve an appropriate balance between the formability and imaging quality of the fourth lens.

[0035] When 2.58<CA4 / (TDP3+TDP6)<10.54 is satisfied, it helps to achieve an appropriate balance between the lens formability and imaging quality of the second lens and the third lens.

[0036] When 5.27<R1 / CT1<139.95 is satisfied, it helps to achieve a proper balance between the radius of curvature and the thickness of the first lens.

[0037] When 10.14mm<(CT4*f1) / (CT2+CT3)<278.32mm is satisfied, it helps to ensure that the lens thickness meets the processing requirements of the lens manufacturing process while satisfying the imaging quality.

[0038] When 0.27<R1 / f1<1.33 is satisfied, it helps to effectively improve the distortion of the optical lens group and further reduce the lens size while reducing aberrations.

[0039] When -5.69 mm<(R1 / R2)*CT1<1.16 mm is satisfied, the two curvature radii are mutually restricted, which helps to prevent the curvature radius from being too small and reduce assembly tolerance and sensitivity.

[0040] When -1.07<R6 / R5<2.24 is satisfied, the two curvature radii are mutually restricted, which helps to prevent the curvature radius from being too small and reduce assembly tolerance and sensitivity.

[0041] Optionally, the total number of lenses with refractive power in the optical lens group is four.

[0042] Optionally, the distance between the eye-side surface of the first lens and the image source plane on the optical axis is TL, and satisfies the following condition: 14.50 mm<TL<27.70 mm.

[0043] Optionally, the radius of the maximum inscribed circle of the effective light emitting area of ​​the display is IMH, and satisfies the following condition: 10.64 mm<IMH<20.21 mm.

[0044] Optionally, the overall focal length of the optical lens assembly is f and satisfies the following condition: 14.03 mm < f < 28.07 mm.

[0045] Optionally, the maximum viewing angle of the optical lens assembly is FOV, and satisfies the following condition: 85.53°<FOV<107.85°.

[0046] In addition, the present invention also provides an electronic device according to an embodiment, comprising: a housing; the above-mentioned optical lens group, which is disposed in the housing; an image source, which is disposed in the housing and configured on the image source surface of the optical lens group; and a controller, which is disposed in the housing and electrically connected to the image source. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Other aspects and advantages of the present invention will be discovered after studying the detailed description in conjunction with the following drawings: Figure 1A FIG. 4 is a schematic diagram of an optical lens assembly according to a first embodiment of the present invention.

[0048] Figure 1B The main light is Figure 1A Schematic diagram of the light path in the optical lens group.

[0049] Figure 2 FIG. 4 is a schematic diagram of an optical lens assembly according to a second embodiment of the present invention.

[0050] Figure 3 FIG. 4 is a schematic diagram of an optical lens assembly according to a third embodiment of the present invention.

[0051] Figure 4 FIG. 4 is a schematic diagram of an optical lens assembly according to a fourth embodiment of the present invention.

[0052] Figure 5 FIG. 5 is a schematic diagram of an optical lens assembly according to a fifth embodiment of the present invention.

[0053] Figure 6 FIG. 4 is a schematic diagram of an optical lens assembly according to a sixth embodiment of the present invention.

[0054] Figure 7 FIG. 4 is a schematic diagram of an optical lens assembly according to a seventh embodiment of the present invention.

[0055] Figure 8 FIG. 4 is a schematic diagram of an optical lens assembly according to an eighth embodiment of the present invention.

[0056] Fig. 9 FIG. 4 is a schematic diagram of a head mounted electronic device according to an embodiment of the present invention.

[0057] Description of Figure Numbers

[0058] 100, 200, 300, 400, 500, 600, 700, 800: light bar

[0059] 110, 210, 310, 410, 510, 610, 710, 810: First lens

[0060] 111, 211, 311, 411, 511, 611, 711, 811: eye side surface

[0061] 112, 212, 312, 412, 512, 612, 712, 812: Image source side surface

[0062] 120, 220, 320, 420, 520, 620, 720, 820: Second lens

[0063] 121, 221, 321, 421, 521, 621, 721, 821: eye side surface

[0064] 122, 222, 322, 422, 522, 622, 722, 822: Image source side surface

[0065] 130, 230, 330, 430, 530, 630, 730, 830: Third lens

[0066] 131, 231, 331, 431, 531, 631, 731, 831: eye side surface

[0067] 132, 232, 332, 432, 532, 632, 732, 832: Image source side surface

[0068] 140,240,340,440,540,640,740,840: Fourth lens

[0069] 141, 241, 341, 441, 541, 641, 741, 841: eye side surface

[0070] 142, 242, 342, 442, 542, 642, 742, 842: Image source side surface

[0071] 150, 250, 350, 450, 550, 650, 750, 850: Optical component set

[0072] 151: First absorption polarizing element

[0073] 152: Reflective polarizing element

[0074] 153: First phase delay element

[0075] 160, 260, 360, 460, 560, 660, 760, 860: partially reflective and partially transmissive elements

[0076] 171, 271, 371, 471, 571, 671, 771, 871: second phase delay element

[0077] 172, 272, 372, 472, 572, 672, 772, 872: Second absorption polarizing element

[0078] 180, 280, 380, 480, 580, 680, 780, 880: Image source plane

[0079] 183, 283, 383, 483, 583, 683, 783, 883: Image source

[0080] 190, 290, 390, 490, 590, 690, 790, 890: optical axis

[0081] 9: Head-mounted electronic devices

[0082] 910: Shell

[0083] 920: Optical-mechanical module

[0084] 930: Image source

[0085] 940: Controller

[0086] CA1: Maximum effective radius of the eye-side surface of the first lens

[0087] CA4: Maximum effective radius of the image source side surface of the second lens

[0088] L: Light path

[0089] TDP1: The absolute value of 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 maximum effective radius position of the eye-side surface of the first lens

[0090] TDP6: The absolute value of the displacement parallel to the optical axis from the intersection of the image source side surface of the third lens on the optical axis to the maximum effective radius position of the image source side surface of the third lens DETAILED DESCRIPTION

[0091] <First embodiment>

[0092] Please refer to Figure 1A to Figure 1BAs shown, the optical lens assembly of the first embodiment includes, in order from the eye side to the image source side along the optical axis 190, a light barrier 100, a first lens 110, a first absorption polarizing element 151, a reflection polarizing element 152, a first phase delay element 153, a second lens 120, a third lens 130, a partially reflective and partially transmissive element 160, a fourth lens 140, a second phase delay element 171, a second absorption polarizing element 172 and an image source surface 180. The total number of lenses with refractive power in the optical lens assembly is, for example but not limited to, 4. The first absorption polarizing element 151, the reflection polarizing element 152 and the first phase delay element 153 constitute an optical element assembly 150.

[0093] The position of the light barrier 100 may be the position where the user's eyes view the image.

[0094] The first lens 110 has positive refractive power and is made of plastic. Its eye-side surface 111 is convex at the near optical axis, and its image source-side surface 112 is convex at the near optical axis. Both the eye-side surface 111 and the image source-side surface 112 of the first lens 110 are spherical surfaces.

[0095] The second lens 120 has positive refractive power and is made of plastic. Its eye-side surface 121 is flat at the near optical axis, and its image source-side surface 122 is convex at the near optical axis. The eye-side surface 121 of the second lens 120 is spherical, and the image source-side surface 122 of the second lens 120 is aspherical.

[0096] The third lens 130 has negative refractive power and is made of plastic, and its eye-side surface 131 is concave at the near optical axis, and its image source-side surface 132 is convex at the near optical axis, and both the eye-side surface 131 and the image source-side surface 132 of the third lens 130 are aspherical surfaces. The second lens 120 and the third lens 130 are cemented together.

[0097] The fourth lens 140 has positive refractive power and is made of plastic. Its eye-side surface 141 is convex at the near optical axis, and its image source-side surface 142 is convex at the near optical axis. Both the eye-side surface 141 and the image source-side surface 142 of the fourth lens 140 are aspherical.

[0098] The first absorption polarizing element 151 is disposed on the eye-side surface of the reflection polarizing element 152, the reflection polarizing element 152 is disposed on the eye-side surface of the first phase delay element 153, and the first phase delay element 153 is disposed on the eye-side surface 121 of the second lens 120. The first phase delay element 153 is, for example but not limited to, a quarter wave plate.

[0099] The partially reflective and partially transmissive element 160 is disposed on the image source side surface 132 of the third lens 130 and has an average light reflectivity of at least 30% in the visible light range, preferably an average light reflectivity of 50%. The average light reflectivity here refers to the average value of the reflectivity of the partially reflective and partially transmissive element 160 for light of different wavelengths.

[0100] The second phase delay element 171 is disposed on the eye-side surface of the second absorption polarization element 170, and the second absorption polarization element 172 is disposed on the image source surface 180. The second phase delay element 171 is, for example but not limited to, a quarter wave plate.

[0101] The optical lens assembly can be used in conjunction with an image source 183, and the image source 183 can be disposed on the image source plane 180. In this embodiment, the type of the image source 183 is, for example but not limited to, an OLED display, a LED display, a liquid crystal display or other displays.

[0102] The curve equations of the aspheric surfaces of the above lenses are expressed as follows:

[0103]

[0104] Wherein z is the position value at a height of h along the optical axis 190 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 at the near optical axis; h is the vertical distance from the lens surface to the optical axis 190; k is the conic constant; Ai is the i-th order aspheric coefficient.

[0105] In the first embodiment, the optical lens group can be configured by combining an absorption polarizing element, a reflection polarizing element, a phase delay element, a partially reflecting and partially transmitting element and a lens, and folding the light path by utilizing the penetration and reflection of light without affecting the quality of the image, so as to compress the length of the lens group required to form the image. Please refer to Figure 1BAccording to the optical path L shown in FIG. 1 , the linearly polarized light emitted by the image source 183 will form circularly polarized light after passing through the second absorption polarizer 172 and the second phase delay element 171. After passing through the fourth lens 140, a portion of the circularly polarized light will pass through the partially reflective and partially transmissive element 160 as a transmitted light in a circularly polarized state and then pass through the third lens 130, the second lens 120 and the first phase delay element 153 to form a transmitted light in a linearly polarized state. Then, the transmitted light in the linearly polarized state is reflected by the reflection polarizer 152 and passes through the first phase delay element 153. The circularly polarized transmitted light is formed by the phase retarder 153. After the circularly polarized transmitted light passes through the second lens 120 and the third lens 130, a portion of the circularly polarized transmitted light is reflected by the partially reflective and partially transmissive element 160 as the circularly polarized reflected light, and then passes through the third lens 130, the second lens 120 and the first phase retarder 153 to form the linearly polarized reflected light. Finally, the linearly polarized reflected light penetrates the reflective polarizing element 152, the first absorptive polarizing element 151 and the first lens 110 to enter the user's eyes to form an image.

[0106] Please refer to Tables 1 to 4. Table 1 shows the detailed optical data of each element in the optical lens assembly of the first embodiment. Table 2 shows the aspheric coefficients of the elements of the optical lens assembly of the first embodiment. Table 3 shows the remaining parameters and values ​​of the optical lens assembly of the first embodiment. The values ​​of the parameters in Tables 1 and 3 satisfy the conditional formula of Table 4. The maximum effective radius of the eye-side surface 111 of the first lens 110 is CA1, the maximum effective radius of the image source-side surface 122 of the second lens 120 is CA4, the thickness of the first lens 110 on the optical axis 190 is CT1, the thickness of the second lens 120 on the optical axis 190 is CT2, the thickness of the third lens 130 on the optical axis 190 is CT3, the thickness of the fourth lens 140 on the optical axis 190 is CT4, and the intersection of the eye-side surface 111 of the first lens 110 on the optical axis 190 to the eye-side surface 112 of the first lens 110 is CT1. The absolute value of the displacement of the maximum effective radius position of the surface 111 parallel to the optical axis 190 is TDP1, the absolute value of the displacement of the intersection of the eye-side surface 121 of the second lens 120 on the optical axis 190 to the maximum effective radius position of the eye-side surface 121 of the second lens 120 parallel to the optical axis 190 is TDP3, and the absolute value of the displacement of the intersection of the image source side surface 132 of the third lens 130 on the optical axis 190 to the maximum effective radius position of the image source side surface 132 of the third lens 130 parallel to the optical axis 190 is TDP6.

[0107]

[0108]

[0109]

[0110]

[0111]

[0112]

[0113] In Table 1, the units of the radius of curvature, thickness, gap and focal length are in mm, and surfaces 21 to 0 represent the surfaces that the light passes through in sequence from the image source plane 180 to the light barrier 100 along the optical path L, wherein: surface 0 corresponds to the gap between the light barrier 100 (or the user's eye) and the first lens 110 on the optical axis 190; surface 1 corresponds to the thickness of the first lens 110 on the optical axis 190; surface 2 corresponds to the gap between the first lens 110 and the first absorption polarizing element 151 on the optical axis 190; surface 3 corresponds to the thickness of the first absorption polarizing element 151 on the optical axis 190; surfaces 4, 11 and 12 correspond to the thickness of the reflection polarizing element 152 on the optical axis 190; surfaces 5, 10 and 13 correspond to the thickness of the first phase delay element 153 on the optical axis 190; surfaces 6, 9 and 14 correspond to the thickness of the second lens 120 on the optical axis 190. The surface 7 and 15 correspond to the thickness of the third lens 130 on the optical axis 190; the surface 8 corresponds to the gap between the image source side surface 132 of the third lens 130 and the image source side surface 122 of the second lens 120 on the optical axis 190, and the gap is equivalent to the thickness of the third lens 130 on the optical axis 190; the surface 16 corresponds to the gap between the eye side surface of the fourth lens 140 and the image source side surface 132 of the third lens 130 on the optical axis 190; the surface 17 corresponds to the thickness of the fourth lens 140 on the optical axis 190; the surface 18 corresponds to the gap between the fourth lens 140 and the second phase delay element 171 on the optical axis 190; the surface 19 corresponds to the thickness of the second phase delay element 171 on the optical axis 190; and the surface 20 corresponds to the thickness of the second absorption polarizing element 172 on the optical axis 190. In Table 1, each gap and thickness represented by a positive value corresponds to the value when the light direction is toward the light stop 100 , while each gap and thickness represented by a negative value corresponds to the value when the light direction is toward the image source surface 180 .

[0114] In Table 2, k is the cone coefficient in the aspheric curve equation, and A2, A4, A6, A8, A10, A12, A14, A16, A18 and A20 are high-order aspheric coefficients.

[0115] In addition, the following tables of the embodiments are schematic diagrams corresponding to the embodiments, and the definitions of the data in the tables are the same as those in Tables 1 to 4 of the first embodiment, except that the definitions of the surface numbers in Table 1 will change with the positions of the optical elements in each embodiment, and the relevant descriptions of each embodiment can refer to the definition of the surface numbers in Table 1, which will not be repeated.

[0116] <Second embodiment>

[0117] Please refer to Figure 2 As shown, the optical lens assembly of the second embodiment includes, in order from the eye side to the image source side along the optical axis 290, a light barrier 200, a first lens 210, a first absorption polarizing element, a reflection polarizing element, a first phase delay element, a second lens 220, a third lens 230, a partially reflective and partially transmissive element 260, a fourth lens 240, a second phase delay element 271, a second absorption polarizing element 272 and an image source surface 280. The total number of lenses with refractive power in the optical lens assembly is, for example but not limited to, 4. The first absorption polarizing element, the reflection polarizing element and the first phase delay element constitute an optical element assembly 250.

[0118] The first lens 210 has positive refractive power and is made of plastic. Its eye-side surface 211 is convex at the near optical axis, its image source-side surface 212 is flat at the near optical axis, and the eye-side surface 211 of the first lens 210 is spherical.

[0119] The second lens 220 has positive refractive power and is made of plastic. Its eye-side surface 221 is convex at the near optical axis, and its image source-side surface 222 is convex at the near optical axis. Both the eye-side surface 221 and the image source-side surface 222 of the second lens 220 are aspherical.

[0120] The third lens 230 has negative refractive power and is made of plastic, and its eye-side surface 231 is concave at the near optical axis, and its image source-side surface 232 is convex at the near optical axis, and both the eye-side surface 231 and the image source-side surface 232 of the third lens 230 are aspherical surfaces. The second lens 220 and the third lens 230 are cemented together.

[0121] The fourth lens 240 has positive refractive power and is made of plastic. Its eye-side surface 241 is convex at the near optical axis, and its image source-side surface 242 is convex at the near optical axis. Both the eye-side surface 241 and the image source-side surface 242 of the fourth lens 240 are aspherical.

[0122] The first absorption polarizing element is disposed on the image source side surface 212 of the first lens 210, the reflection polarizing element is disposed on the image source side surface of the first absorption polarizing element, and the first phase delay element is disposed on the image source side surface of the reflection polarizing element. The first phase delay element is, for example but not limited to, a quarter wave plate.

[0123] The optical lens assembly can be used in conjunction with an image source 283 , and the image source 283 can be disposed on the image source plane 280 .

[0124] The configurations of the light barrier 200, the partially reflective and partially transmissive element 260, the second phase delay element 271 and the second absorptive polarizing element 272 and the type of the image source 283 may refer to the light barrier 100, the partially reflective and partially transmissive element 160, the second phase delay element 171, the second absorptive polarizing element 172 and the image source 183 of the first embodiment and will not be described in detail herein.

[0125] Please refer to Tables 5 to 8 below. Table 5 is the detailed optical data of each element in the optical lens set of the second embodiment. Table 6 is the aspheric coefficients of the elements of the optical lens set of the second embodiment. Table 7 is the remaining parameters and their values ​​of the optical lens set of the second embodiment. The values ​​of the parameters in Tables 5 and 7 meet the conditional equations in Table 8. The curve equation of the aspheric surface of the second embodiment is the same as the curve equation of the aspheric surface of the first embodiment. The definition of each surface in Table 5 can refer to the relevant description of Table 1, and will not be repeated here.

[0126]

[0127]

[0128]

[0129]

[0130]

[0131]

[0132] <Third embodiment>

[0133] Please refer to Figure 3 As shown, the optical lens assembly of the third embodiment includes, from the eye side to the image source side, a light barrier 300, a first lens 310, a first absorption polarizing element, a reflection polarizing element, a first phase delay element, a second lens 320, a third lens 330, a partially reflective and partially transmissive element 360, a fourth lens 340, a second phase delay element 371, a second absorption polarizing element 372, and an image source surface 380 in order along the optical axis 390. The total number of lenses with refractive power in the optical lens assembly is, for example but not limited to, 4. The first absorption polarizing element, the reflection polarizing element, and the first phase delay element constitute an optical element assembly 350.

[0134] The first lens 310 has positive refractive power and is made of plastic. Its eye-side surface 311 is convex at the near optical axis, and its image source-side surface 312 is convex at the near optical axis. Both the eye-side surface 311 and the image source-side surface 312 of the first lens 310 are spherical.

[0135] The second lens 320 has negative refractive power and is made of plastic. Its eye-side surface 321 is concave at the near optical axis, and its image source-side surface 322 is concave at the near optical axis. Both the eye-side surface 321 and the image source-side surface 322 of the second lens 320 are aspherical.

[0136] The third lens 330 has positive refractive power and is made of plastic. Its eye-side surface 331 is convex at the near optical axis, and its image source-side surface 332 is convex at the near optical axis. Both the eye-side surface 331 and the image source-side surface 332 of the third lens 330 are aspherical.

[0137] The fourth lens 340 has positive refractive power and is made of plastic. Its eye-side surface 341 is convex at the near optical axis, its image source-side surface 342 is flat at the near optical axis, and the eye-side surface 341 of the fourth lens 340 is aspherical.

[0138] The optical lens assembly can be used in conjunction with an image source 383 , and the image source 383 can be disposed on the image source plane 380 .

[0139] The configurations of the light bar 300, the partially reflective and partially transmissive element 360, the second phase delay element 371 and the second absorptive polarizing element 372 and the type of the image source 383 may refer to the light bar 100, the partially reflective and partially transmissive element 160, the second phase delay element 171, the second absorptive polarizing element 172 and the image source 183 of the first embodiment, and the configuration of the optical element group 350 may refer to the optical element group 250 of the second embodiment, which will not be described in detail herein.

[0140] Please refer to Tables 9 to 12 below. Table 9 shows the detailed optical data of each element in the optical lens assembly of the third embodiment. Table 10 shows the aspheric coefficients of the elements of the optical lens assembly of the third embodiment. Table 11 shows the remaining parameters and their values ​​of the optical lens assembly of the third embodiment. The values ​​of the parameters in Tables 9 and 11 meet the conditional equations in Table 12. The curve equation of the aspheric surface of the third embodiment is the same as the curve equation of the aspheric surface of the first embodiment. The definition of each surface in Table 9 can refer to the relevant description of Table 1, and will not be repeated here.

[0141]

[0142]

[0143]

[0144]

[0145]

[0146] <Fourth embodiment>

[0147] Please refer to Figure 4 As shown, the optical lens assembly of the fourth embodiment includes, in order from the eye side to the image source side along the optical axis 490, a light barrier 400, a first lens 410, a first absorption polarizing element, a reflection polarizing element, a first phase delay element, a second lens 420, a third lens 430, a partially reflective and partially transmissive element 460, a fourth lens 440, a second phase delay element 471, a second absorption polarizing element 472 and an image source surface 480. The total number of lenses with refractive power in the optical lens assembly is, for example but not limited to, 4. The first absorption polarizing element, the reflection polarizing element and the first phase delay element constitute an optical element assembly 450.

[0148] The first lens 410 has positive refractive power and is made of plastic. Its eye-side surface 411 is convex at the near optical axis, and its image source-side surface 412 is convex at the near optical axis. Both the eye-side surface 411 and the image source-side surface 412 of the first lens 410 are aspherical.

[0149] The second lens 420 has negative refractive power and is made of plastic. Its eye-side surface 421 is flat at the near optical axis, and its image source-side surface 422 is concave at the near optical axis. The image source-side surface 422 of the second lens 420 is aspherical.

[0150] The third lens 430 has positive refractive power and is made of plastic. Its eye-side surface 431 is convex at the near optical axis, and its image source-side surface 432 is convex at the near optical axis. Both the eye-side surface 431 and the image source-side surface 432 of the third lens 430 are aspherical.

[0151] The fourth lens 440 has positive refractive power and is made of plastic. Its eye-side surface 441 is convex at the near optical axis, and its image source-side surface 442 is concave at the near optical axis. The eye-side surface 441 of the fourth lens 440 is aspherical, and the image source-side surface 442 of the fourth lens 440 is spherical.

[0152] The optical lens assembly can be used in conjunction with an image source 483 , and the image source 483 can be disposed on the image source plane 480 .

[0153] The configurations of the light barrier 400, the optical element group 450, the partially reflective and partially transmissive element 460, the second phase delay element 471 and the second absorptive polarizing element 472 and the type of the image source 483 can refer to the light barrier 100, the optical element group 150, the partially reflective and partially transmissive element 160, the second phase delay element 171, the second absorptive polarizing element 172 and the image source 183 of the first embodiment and will not be described in detail herein.

[0154] Please refer to Tables 13 to 16 below. Table 13 shows the detailed optical data of each element in the optical lens set of the fourth embodiment. Table 14 shows the aspheric coefficients of the elements of the optical lens set of the fourth embodiment. Table 15 shows the remaining parameters and their values ​​of the optical lens set of the fourth embodiment. The values ​​of the parameters in Tables 13 and 15 meet the conditional equations in Table 16. The curve equation of the aspheric surface of the fourth embodiment is the same as the curve equation of the aspheric surface of the first embodiment. The definition of each surface in Table 13 can refer to the relevant description of Table 1, and will not be repeated here.

[0155]

[0156]

[0157]

[0158]

[0159]

[0160] <Fifth embodiment>

[0161] Please refer to Figure 5 As shown, the optical lens assembly of the fifth embodiment includes, along the optical axis 590 from the eye side to the image source side, a light barrier 500, a first lens 510, a first absorption polarizing element, a reflection polarizing element, a first phase delay element, a second lens 520, a third lens 530, a partially reflective and partially transmissive element 560, a fourth lens 540, a second phase delay element 571, a second absorption polarizing element 572 and an image source surface 580. The total number of lenses with refractive power in the optical lens assembly is, for example but not limited to, 4. The first absorption polarizing element, the reflection polarizing element and the first phase delay element constitute an optical element assembly 550.

[0162] The first lens 510 has positive refractive power and is made of plastic. Its eye-side surface 511 is convex at the near optical axis, and its image source-side surface 512 is concave at the near optical axis. Both the eye-side surface 511 and the image source-side surface 512 of the first lens 510 are aspherical.

[0163] The second lens 520 has positive refractive power and is made of plastic. Its eye-side surface 521 is flat at the near optical axis, its image source-side surface 522 is convex at the near optical axis, and the image source-side surface 522 of the second lens 520 is aspherical.

[0164] The third lens 530 has negative refractive power and is made of plastic. Its eye-side surface 531 is concave at the near optical axis, and its image source-side surface 532 is convex at the near optical axis. Both the eye-side surface 531 and the image source-side surface 532 of the third lens 230 are aspherical.

[0165] The fourth lens 540 has positive refractive power and is made of plastic. Its eye-side surface 541 is convex at the near optical axis, its image source-side surface 542 is flat at the near optical axis, and the eye-side surface 541 of the fourth lens 540 is spherical.

[0166] The optical lens assembly can be used in conjunction with an image source 583 , and the image source 583 can be disposed on the image source plane 580 .

[0167] The configurations of the light barrier 500, the optical element group 550, the partially reflective and partially transmissive element 560, the second phase delay element 571 and the second absorptive polarizing element 572 and the type of the image source 583 can refer to the light barrier 100, the optical element group 150, the partially reflective and partially transmissive element 160, the second phase delay element 171, the second absorptive polarizing element 172 and the image source 183 of the first embodiment and will not be described in detail herein.

[0168] Please refer to Tables 17 to 20 below. Table 17 shows the detailed optical data of each element in the optical lens set of the fifth embodiment. Table 18 shows the aspheric coefficients of the elements of the optical lens set of the fifth embodiment. Table 19 shows the remaining parameters and their values ​​of the optical lens set of the fifth embodiment. The values ​​of the parameters in Tables 17 and 19 meet the conditional equations in Table 20. The curve equation of the aspheric surface of the fifth embodiment is the same as the curve equation of the aspheric surface of the first embodiment. The definition of each surface in Table 17 can refer to the relevant description of Table 1, and will not be repeated here.

[0169]

[0170]

[0171]

[0172]

[0173]

[0174]

[0175] <Sixth embodiment>

[0176] Please refer to Figure 6As shown, the optical lens assembly of the sixth embodiment includes, along the optical axis 690 from the eye side to the image source side, a light barrier 600, a first lens 610, a first absorption polarizing element, a reflection polarizing element, a first phase delay element, a second lens 620, a third lens 630, a partially reflective and partially transmissive element 660, a fourth lens 640, a second phase delay element 671, a second absorption polarizing element 672 and an image source surface 680. The total number of lenses with refractive power in the optical lens assembly is, for example but not limited to, 4. The first absorption polarizing element, the reflection polarizing element and the first phase delay element constitute an optical element assembly 650.

[0177] The first lens 610 has positive refractive power and is made of plastic. Its eye-side surface 611 is convex at the near optical axis, and its image source-side surface 612 is convex at the near optical axis. Both the eye-side surface 611 and the image source-side surface 612 of the first lens 610 are aspherical.

[0178] The second lens 620 has negative refractive power and is made of plastic. Its eye-side surface 621 is convex at the near optical axis, and its image source-side surface 622 is concave at the near optical axis. The eye-side surface 621 of the second lens 620 is spherical, and the image source-side surface 622 of the second lens 620 is aspherical.

[0179] The third lens 630 has positive refractive power and is made of plastic, and its eye-side surface 631 is convex at the near optical axis, and its 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 of the third lens 630 are aspherical surfaces. The second lens 620 and the third lens 630 are cemented together.

[0180] The fourth lens 640 has positive refractive power and is made of plastic. Its eye-side surface 641 is convex at the near optical axis, and its image source-side surface 642 is concave at the near optical axis. Both the eye-side surface 641 and the image source-side surface 642 of the fourth lens 640 are aspherical.

[0181] The optical lens assembly can be used in conjunction with an image source 683 , and the image source 683 can be disposed on the image source plane 680 .

[0182] The configurations of the light bar 600, the optical element group 650, the partially reflective and partially transmissive element 660, the second phase delay element 671 and the second absorptive polarizing element 672 and the type of the image source 683 can refer to the light bar 100, the optical element group 150, the partially reflective and partially transmissive element 160, the second phase delay element 171, the second absorptive polarizing element 172 and the image source 183 of the first embodiment and will not be described in detail here.

[0183] Please refer to Tables 21 to 24 below. Table 21 shows the detailed optical data of each element in the optical lens set of the sixth embodiment. Table 22 shows the aspheric coefficients of the elements of the optical lens set of the sixth embodiment. Table 23 shows the remaining parameters and their values ​​of the optical lens set of the sixth embodiment. The values ​​of the parameters in Tables 21 and 23 meet the conditional equations in Table 24. The curve equation of the aspheric surface of the sixth embodiment is the same as the curve equation of the aspheric surface of the first embodiment. The definition of each surface in Table 21 can refer to the relevant description of Table 1, and will not be repeated here.

[0184]

[0185]

[0186]

[0187]

[0188]

[0189]

[0190] <Seventh embodiment>

[0191] Please refer to Figure 7 As shown, the optical lens assembly of the seventh embodiment includes, along the optical axis 790 from the eye side to the image source side, a light barrier 700, a first lens 710, a first absorption polarizing element, a reflection polarizing element, a first phase delay element, a second lens 720, a third lens 730, a partially reflective and partially transmissive element 760, a fourth lens 740, a second phase delay element 771, a second absorption polarizing element 772 and an image source surface 780. The total number of lenses with refractive power in the optical lens assembly is, for example but not limited to, 4. The first absorption polarizing element, the reflection polarizing element and the first phase delay element constitute an optical element assembly 750.

[0192] The first lens 710 has positive refractive power and is made of plastic. Its eye-side surface 711 is convex at the near optical axis, and its image source-side surface 712 is convex at the near optical axis. Both the eye-side surface 711 and the image source-side surface 712 of the first lens 710 are aspherical.

[0193] The second lens 720 has negative refractive power and is made of plastic. Its eye-side surface 721 is a plane at the near optical axis, and its image source-side surface 722 is a concave surface at the near optical axis. The image source-side surface 722 of the second lens 720 is aspherical.

[0194] The third lens 730 has positive refractive power and is made of plastic, and its eye-side surface 731 is convex at the near optical axis, and its image source-side surface 732 is convex at the near optical axis, and both the eye-side surface 731 and the image source-side surface 732 of the third lens 730 are aspherical surfaces. The second lens 720 and the third lens 730 are cemented together.

[0195] The fourth lens 740 has positive refractive power and is made of plastic. Its eye-side surface 741 is convex at the near optical axis, and its image source-side surface 742 is concave at the near optical axis. Both the eye-side surface 741 and the image source-side surface 742 of the fourth lens 740 are aspherical.

[0196] The optical lens assembly can be used in conjunction with an image source 783 , and the image source 783 can be disposed on the image source plane 780 .

[0197] The configurations of the light bar 700, the optical element group 750, the partially reflective and partially transmissive element 760, the second phase delay element 771 and the second absorptive polarizing element 772 and the type of the image source 783 can refer to the light bar 100, the optical element group 150, the partially reflective and partially transmissive element 160, the second phase delay element 171, the second absorptive polarizing element 172 and the image source 183 of the first embodiment and will not be described in detail here.

[0198] Please refer to Tables 25 to 28 below. Table 25 shows detailed optical data of each element in the optical lens set of the seventh embodiment. Table 26 shows aspheric coefficients of the elements of the optical lens set of the seventh embodiment. Table 27 shows other parameters and their values ​​of the optical lens set of the seventh embodiment. The values ​​of the parameters in Tables 25 and 27 meet the conditional equations in Table 28. The curve equation of the aspheric surface of the seventh embodiment is the same as the curve equation of the aspheric surface of the first embodiment. The definition of each surface in Table 25 can refer to the relevant description of Table 1, and will not be repeated here.

[0199]

[0200]

[0201]

[0202]

[0203]

[0204] <Eighth Embodiment>

[0205] Please refer to Figure 8As shown, the optical lens assembly of the eighth embodiment includes, along the optical axis 890 from the eye side to the image source side, a light barrier 800, a first lens 810, a first absorption polarizing element, a reflection polarizing element, a first phase delay element, a second lens 820, a third lens 830, a partially reflective and partially transmissive element 860, a fourth lens 840, a second phase delay element 871, a second absorption polarizing element 872, and an image source surface 880. The total number of lenses with refractive power in the optical lens assembly is, for example but not limited to, 4. The first absorption polarizing element, the reflection polarizing element, and the first phase delay element constitute an optical element assembly 850.

[0206] The first lens 810 has positive refractive power and is made of plastic. Its eye-side surface 811 is convex at the near optical axis, and its image source-side surface 812 is convex at the near optical axis. Both the eye-side surface 811 and the image source-side surface 812 of the first lens 810 are aspherical.

[0207] The second lens 820 has negative refractive power and is made of plastic. Its eye-side surface 821 is a plane at the near optical axis, and its image source-side surface 822 is a concave surface at the near optical axis. The image source-side surface 822 of the second lens 820 is aspherical.

[0208] The third lens 830 has positive refractive power and is made of plastic, and its eye-side surface 831 is convex at the near optical axis, and its 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 of the third lens 830 are aspherical surfaces. The second lens 820 and the third lens 830 are cemented together.

[0209] The fourth lens 840 has positive refractive power and is made of plastic. Its eye-side surface 841 is convex at the near optical axis, and its image source-side surface 842 is convex at the near optical axis. Both the eye-side surface 841 and the image source-side surface 842 of the fourth lens 840 are aspherical.

[0210] The optical lens assembly can be used in conjunction with an image source 883 , and the image source 883 can be disposed on the image source plane 880 .

[0211] The configurations of the light bar 800, the optical element group 850, the partially reflective and partially transmissive element 860, the second phase delay element 871 and the second absorptive polarizing element 872 and the type of the image source 883 can refer to the light bar 100, the optical element group 150, the partially reflective and partially transmissive element 160, the second phase delay element 171, the second absorptive polarizing element 172 and the image source 183 of the first embodiment and will not be described in detail here.

[0212] Please refer to Tables 29 to 32 below. Table 29 shows the detailed optical data of each element in the optical lens set of the eighth embodiment. Table 30 shows the aspheric coefficients of the elements of the optical lens set of the eighth embodiment. Table 31 shows the remaining parameters and their values ​​of the optical lens set of the eighth embodiment. The values ​​of the parameters in Tables 29 and 31 meet the conditional equations in Table 32. The curve equation of the aspheric surface of the eighth embodiment is the same as the curve equation of the aspheric surface of the first embodiment. The definition of each surface in Table 29 can refer to the relevant description of Table 1, and will not be repeated here.

[0213]

[0214]

[0215]

[0216]

[0217]

[0218]

[0219] In the optical lens assembly provided by the present invention, the lens can be made of plastic or glass. When the lens is made of plastic, the production cost can be effectively reduced; when the lens is made of glass, the degree of freedom of the refractive power configuration of the optical lens assembly can be increased.

[0220] In the optical lens assembly provided by the present invention, the aspherical lens surface can be made into a shape other than a spherical surface to obtain more control variables and to reduce aberrations, thereby reducing the number of lenses used, thereby effectively reducing the total length of the optical lens assembly of the present invention.

[0221] In the optical lens set provided by the present invention, with respect to a lens having refractive power, if the surface of the lens is convex and the position of the convex surface is not defined, it means that the surface of the lens is convex at the near optical axis; if the surface of the lens is concave and the position of the concave surface is not defined, it means that the surface of the lens is concave at the near optical axis.

[0222] In the optical lens assembly provided by the present invention, the maximum effective radius of the lens surface generally refers to the radius of the effective optical area of ​​the lens surface (ie, the area of ​​the lens that has not been surface treated, ablated or applied with a light shielding layer, but not limited thereto).

[0223] In addition, the optical lens assembly provided by the present invention can be applied to an electronic device, such as but not limited to a head-mounted electronic device. Fig. 9The schematic diagram of a head-mounted electronic device according to an embodiment of the present invention is shown. The head-mounted electronic device 9 is, for example but not limited to, a head-mounted display using virtual reality technology, augmented reality (AR) technology, and mixed reality (MR) technology, and includes a housing 910, an optical-mechanical module 920, an image source 930, and a controller 940 disposed in the housing 910.

[0224] The optical module 920 corresponds to the left eye and the right eye of the user respectively. The optical module 920 includes an optical lens set, and the optical lens set can be any one of the optical lens sets in the first embodiment to the eighth embodiment.

[0225] The image source 930 may be any one of the image sources of the first embodiment to the eighth embodiment. The image source 930 may correspond to the left eye and the right eye. The type of the image source 930 is, for example but not limited to, an OLED display, an LED display, a liquid crystal display or other displays.

[0226] The controller 940 is electrically connected to the image source 930 to control the image source 930 to display images, so that the head mounted electronic device 9 can project images to the user's eyes.

[0227] Although the present invention is disclosed as above with the aforementioned embodiments, these embodiments are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the changes, modifications and combinations of various embodiments are all within the scope of patent protection of the present invention. Please refer to the attached claims for the scope of protection defined by the present invention.

Claims

1. An optical lens assembly, characterized in that: Include: a reflective polarizing element; a phase delay element; and The invention comprises, in order from the eye side to the image source side, a first lens with positive refractive power, a second lens with refractive power, a third lens with refractive power and a convex surface on the image source side, a partially reflective and partially transmissive element, and a fourth lens with refractive power; The total number of lenses with refractive power in the optical lens group is four, the reflective polarizing element is located between the first lens and the second lens, the phase delay element is located between the reflective polarizing element and the partially reflective and partially transmissive element, the thickness of the third lens on the optical axis is CT3, the absolute value of the displacement from the intersection of the image source side surface of the third lens on the optical axis to the maximum effective radius position of the image source side surface of the third lens parallel to the optical axis is TDP6, and the following conditions are satisfied: 0.37<CT3 / TDP6<5.

39.

2. The optical lens assembly according to claim 1, characterized in that: The maximum effective radius of the eye side surface of the first lens is CA1, and the absolute value of the displacement from the intersection of the eye side surface of the first lens on the optical axis to the maximum effective radius position of the eye side surface of the first lens parallel to the optical axis is TDP1, and satisfies the following conditions: 4.42<CA1 / TDP1<41.

58.

3. The optical lens assembly according to claim 1, characterized in that: The focal length of the third lens is f3, the curvature radius of the image source side surface of the third lens is R6, and the following condition is satisfied: -1.92<f3 / R6<8.

96.

4. The optical lens assembly according to claim 1, characterized in that: The focal length of the first lens is f1, the overall focal length of the optical lens group is f, and the following condition is satisfied: 2.61<f1 / f<25.

10.

5. The optical lens assembly according to claim 1, characterized in that: The focal length of the second lens is f2, the thickness of the second lens on the optical axis is CT2, and the following condition is satisfied: -106.00<f2 / CT2<19.

81.

6. The optical lens assembly according to claim 1, characterized in that: The focal length of the third lens is f3, the focal length of the fourth lens is f4, the thickness of the third lens on the optical axis is CT3, the thickness of the fourth lens on the optical axis is CT4, and the following condition is satisfied: -120.81<(f3 / CT3)+(f4 / CT4)<158.

75.

7. The optical lens assembly according to claim 1, characterized in that: The focal length of the first lens is f1, the thickness of the first lens on the optical axis is CT1, and the following condition is satisfied: 7.80<f1 / CT1<256.

47.

8. The optical lens assembly according to claim 1, characterized in that: 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, the thickness of the second lens on the optical axis is CT2, and the following condition is satisfied: -7.72<(f2 / CT1)+(f1 / CT2)<100.

65.

9. The optical lens assembly according to claim 1, characterized in that: The focal length of the first lens is f1, the focal length of the second lens is f2, and the following condition is satisfied: -1.28<f1 / f2<7.

37.

10. The optical lens assembly according to claim 1, characterized in that: The curvature radius of the eye side surface of the third lens is R5, the curvature radius of the image source side surface of the third lens is R6, the focal length of the second lens is f2, the thickness of the second lens on the optical axis is CT2, and the following conditions are satisfied: 4.88<R5*R6 / (f2*CT2)<40.

13.

11. The optical lens assembly according to claim 1, characterized in that: The curvature radius of the eye-side surface of the fourth lens is R7, the thickness of the fourth lens on the optical axis is CT4, and the following condition is satisfied: 5.29<R7 / CT4<78.

07.

12. The optical lens assembly according to claim 1, characterized in that: The maximum effective radius of the image source side surface of the second lens is CA4, the absolute value of the displacement from the intersection of the eye side surface of the second lens on the optical axis to the maximum effective radius position of the eye side surface of the second lens parallel to the optical axis is TDP3, the absolute value of the displacement from the intersection of the image source side surface of the third lens on the optical axis to the maximum effective radius position of the image source side surface of the third lens parallel to the optical axis is TDP6, and the following conditions are satisfied: 2.58<CA4 / (TDP3+TDP6)<10.

54.

13. The optical lens assembly according to claim 1, characterized in that: The curvature radius of the eye-side surface of the first lens is R1, the thickness of the first lens on the optical axis is CT1, and the following condition is satisfied: 5.27<R1 / CT1<139.

95.

14. The optical lens assembly according to claim 1, characterized in that: The focal length of the first lens is f1, the thickness of the second lens on the optical axis is CT2, the thickness of the third lens on the optical axis is CT3, the thickness of the fourth lens on the optical axis is CT4, and the following conditions are satisfied: 10.14mm<(CT4*f1) / (CT2+CT3)<278.32mm.

15. An electronic device, characterized in that: Include: a housing; The optical lens assembly according to any one of claims 1 to 14, disposed in the housing; An image source is disposed in the housing and arranged on the image source surface of the optical lens assembly; and A controller is disposed in the housing and electrically connected to the image source.

Images