Optical lens group

Abstract

This invention provides an optical lens assembly comprising, sequentially from the light-emitting side to the light-receiving side along an optical axis, lenses one through six. The light-receiving surface of the sixth lens has a concave surface in an optical axis region and a convex surface in a circumferential region. The light-emitting surface of the sixth lens has a concave circumferential region. The optical lens assembly satisfies the conditions EDmax / EDmin ≦ 2.100 and 3.000 ≦ (D21t 32 + G56) / D 11t 21. EDmax and EDmin are the maximum and minimum effective diameters. D21t 32 is the distance from the light-emitting surface of the second lens to the light-receiving surface of the third lens. G56 is the air gap between the fifth and sixth lenses along the optical axis. D 11t 21 is the distance from the light-emitting surface of the first lens to the light-emitting surface of the second lens.

Description

Technical Field

[0001] This invention relates to an optical lens assembly. Background Technology

[0002] The specifications of portable electronic devices are constantly evolving, and their key components—optical lens groups—are also becoming more diversified. The rise of virtual reality (VR) and / or augmented reality (AR) is driving the rapid development of head-mounted wearable devices and peripherals. Therefore, in addition to being used for photography and video recording, optical lens groups can also utilize the principle of optical reflection to project information or images onto the lenses of head-mounted wearable devices, and then, through reflection, project the information or images into the user's eyes to achieve an augmented reality effect.

[0003] However, achieving the optimal ratio between light convergence and projection imaging, while possessing a lightweight, compact, and high-quality optical lens assembly, has become a major design challenge for the industry. Summary of the Invention

[0004] This invention provides an optical lens assembly that helps improve projection effect, shorten the system length of projection lens and / or provide good imaging quality.

[0005] An embodiment of the present invention provides an optical lens assembly suitable for a projection lens, wherein multiple beams are generated by multiple light sources emitted from a multi-source generating unit. The direction toward the multi-source generating unit is an incident light side, and the opposite side is an exiting light side. The optical lens assembly includes, sequentially along an optical axis from the exiting light side to the incident light side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. Each of the first, second, third, fourth, fifth, and sixth lenses includes an exiting light surface facing the exiting light side and an incident light surface facing the incident light side. The second lens has a positive refractive index. The fifth lens has a positive refractive index. An optical axis region of the incident light surface of the sixth lens is concave, and a circumferential region of the incident light surface of the sixth lens is convex. A circumferential region of the exiting light surface of the sixth lens is concave. The optical lens group consists only of the first to sixth lenses mentioned above, and satisfies the following conditions: EDmax / EDmin≦2.100 and 3.000≦(D21t32+G56) / D11t21, where EDmax is the maximum effective diameter among the first to sixth lenses, and EDmin is the minimum effective diameter among the first to sixth lenses, D21t32 is the distance from the light-emitting surface of the second lens to the light-incident surface of the third lens, G56 is the air gap between the fifth and sixth lenses on the optical axis, and D11t21 is the distance from the light-emitting surface of the first lens to the light-emitting surface of the second lens.

[0006] An embodiment of the present invention provides an optical lens assembly suitable for a projection lens, wherein multiple beams are generated by multiple light sources emitted from a multi-source generating unit. The direction toward the multi-source generating unit is a light-incident side, and the opposite side is a light-outceasing side. The optical lens assembly sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens along an optical axis from the light-outceasing side to the light-incident side. Each of the first, second, third, fourth, fifth, and sixth lenses includes a light-outceasing surface facing the light-outceasing side and a light-incident surface facing the light-incident side. The second lens has a positive refractive index. The fifth lens has a positive refractive index. A region along the optical axis of the light-outceasing surface of the second lens is convex. A region along the optical axis of the light-incident surface of the sixth lens is concave. A circumferential region of the light-outceasing surface of the sixth lens is concave. The optical lens group consists only of the first to sixth lenses mentioned above, and satisfies the following conditions: EDmax / EDmin≦2.100 and 4.100≦(D21t32+G56)*Fno / (D11t21+G34), where EDmax is the maximum effective diameter among the first to sixth lenses, EDmin is the minimum effective diameter among the first to sixth lenses, D21t32 is the distance from the light-emitting surface of the second lens to the light-receiving surface of the third lens, G56 is the air gap between the fifth and sixth lenses on the optical axis, Fno is the aperture value, D11t21 is the distance from the light-emitting surface of the first lens to the light-emitting surface of the second lens, and G34 is the air gap between the third and fourth lenses on the optical axis.

[0007] An embodiment of the present invention provides an optical lens assembly suitable for a projection lens, wherein multiple beams are generated by multiple light sources emitted from a multi-source generating unit. The direction toward the multi-source generating unit is an incident light side, and the opposite side is an exiting light side. The optical lens assembly sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens along an optical axis from the exiting light side to the incident light side. Each of the first, second, third, fourth, fifth, and sixth lenses includes an exiting light surface facing the exiting light side and an incident light surface facing the incident light side. The second lens has a positive refractive index. The fifth lens has a positive refractive index. A circumferential region of the exiting light surface of the fifth lens is concave. A region along the optical axis of the incident light surface of the sixth lens is concave. A circumferential region of the exiting light surface of the sixth lens is concave. The optical lens group consists only of the first to sixth lenses mentioned above, and satisfies the following conditions: EDmax / EDmin≦2.100 and 4.100≦(D21t32+G56)*Fno / (D11t21+G34), where EDmax is the maximum effective diameter among the first to sixth lenses, EDmin is the minimum effective diameter among the first to sixth lenses, D21t32 is the distance from the light-emitting surface of the second lens to the light-receiving surface of the third lens, G56 is the air gap between the fifth and sixth lenses on the optical axis, Fno is the aperture value, D11t21 is the distance from the light-emitting surface of the first lens to the light-emitting surface of the second lens, and G34 is the air gap between the third and fourth lenses on the optical axis.

[0008] Based on the above, the beneficial effects of the optical imaging lens of the embodiments of the present invention are as follows: by satisfying the above-mentioned concave and convex surface arrangement design of the lens, the refractive index condition, and the design that satisfies the above-mentioned conditional formula, the optical lens group helps to improve the projection effect, shorten the system length of the projection lens, and / or provide good imaging quality.

[0009] To make the above features and advantages of the present invention more apparent and understandable, specific embodiments are described below in conjunction with the accompanying drawings. Attached Figure Description

[0010] Figure 1A This is a schematic diagram illustrating the application of the optical lens group of the present invention to a projection lens;

[0011] Figure 1B yes Figure 1A A front view of an embodiment of the multi-light source generating unit;

[0012] Figure 2 It is a schematic diagram illustrating the surface structure of a lens;

[0013] Figure 3 It is a schematic diagram illustrating the concave and convex structure of a lens and the focal point of light rays;

[0014] Figure 4 It is a schematic diagram illustrating the surface structure of a lens in Example 1;

[0015] Figure 5 This is a schematic diagram illustrating the surface structure of a lens in Example 2;

[0016] Figure 6 This is a schematic diagram illustrating the surface structure of a lens in Example 3;

[0017] Figure 7 This is a schematic diagram of the optical lens assembly according to the first embodiment of the present invention;

[0018] Figure 8A This is a schematic diagram of the longitudinal spherical aberration of the optical lens group in the first embodiment;

[0019] Figure 8B This is a half-field angle diagram of the field curvature (sagittal direction) of the optical lens group in the first embodiment;

[0020] Figure 8C This is a half-field-of-view diagram of the field curvature (meridian direction) of the optical lens group in the first embodiment;

[0021] Figure 8D This is a diagram showing the half-field angle of the optical lens group in the first embodiment, illustrating the distortion.

[0022] Figure 9 Detailed optical data of the optical lens group according to the first embodiment of the present invention are shown;

[0023] Figure 10 The aspherical parameters of the optical lens group according to the first embodiment of the present invention are shown;

[0024] Figure 11 This is a schematic diagram of the optical lens assembly according to the second embodiment of the present invention;

[0025] Figure 12A This is a schematic diagram of the longitudinal spherical aberration of the optical lens group in the second embodiment;

[0026] Figure 12B This is a half-field angle diagram of the field curvature (sagittal direction) of the optical lens group in the second embodiment;

[0027] Figure 12C This is a half-field-of-view diagram of the field curvature (meridian direction) of the optical lens group in the second embodiment;

[0028] Figure 12D This is a diagram showing the half-field angle of the optical lens group in the second embodiment, illustrating the distortion.

[0029] Figure 13 Detailed optical data of the optical lens group according to the second embodiment of the present invention are shown;

[0030] Figure 14 The aspherical parameters of the optical lens group according to the second embodiment of the present invention are shown;

[0031] Figure 15 This is a schematic diagram of the optical lens assembly according to the third embodiment of the present invention;

[0032] Figure 16A This is a schematic diagram of the longitudinal spherical aberration of the optical lens group in the third embodiment;

[0033] Figure 16B This is a half-field-of-view diagram of the field curvature (sagittal direction) of the optical lens group in the third embodiment;

[0034] Figure 16C This is a half-field-of-view diagram of the field curvature (meridian direction) of the optical lens group in the third embodiment;

[0035] Figure 16D This is a diagram showing the half-field angle of the optical lens group in the third embodiment, illustrating the distortion.

[0036] Figure 17 Detailed optical data of the optical lens group according to the third embodiment of the present invention are shown;

[0037] Figure 18 The aspherical parameters of the optical lens group according to the third embodiment of the present invention are shown;

[0038] Figure 19 This is a schematic diagram of the optical lens assembly according to the fourth embodiment of the present invention;

[0039] Figure 20A This is a schematic diagram of the longitudinal spherical aberration of the optical lens group in the fourth embodiment;

[0040] Figure 20B This is a half-field-of-view diagram of the field curvature (sagittal direction) of the optical lens group in the fourth embodiment;

[0041] Figure 20C This is a half-field-of-view diagram of the field curvature (meridian direction) of the optical lens group in the fourth embodiment;

[0042] Figure 20D This is a half-field-of-view diagram showing the distortion of the optical lens group in the fourth embodiment;

[0043] Figure 21 Detailed optical data of the optical lens group according to the fourth embodiment of the present invention are shown;

[0044] Figure 22 The aspherical parameters of the optical lens group according to the fourth embodiment of the present invention are shown;

[0045] Figure 23This is a schematic diagram of the optical lens assembly according to the fifth embodiment of the present invention;

[0046] Figure 24A This is a schematic diagram of the longitudinal spherical aberration of the optical lens group in the fifth embodiment;

[0047] Figure 24B This is a half-field-of-view diagram of the field curvature (sagittal direction) of the optical lens group in the fifth embodiment;

[0048] Figure 24C This is a half-field-of-view diagram of the field curvature (meridian direction) of the optical lens group in the fifth embodiment;

[0049] Figure 24D This is a diagram showing the half-field angle of the optical lens group in the fifth embodiment, illustrating the distortion.

[0050] Figure 25 Detailed optical data of the optical lens group according to the fifth embodiment of the present invention are shown;

[0051] Figure 26 The aspherical parameters of the optical lens group according to the fifth embodiment of the present invention are shown;

[0052] Figure 27 This is a schematic diagram of the optical lens assembly according to the sixth embodiment of the present invention;

[0053] Figure 28A This is a schematic diagram of the longitudinal spherical aberration of the optical lens group in the sixth embodiment;

[0054] Figure 28B This is a half-field-of-view diagram of the field curvature (sagittal direction) of the optical lens group in the sixth embodiment;

[0055] Figure 28C This is a half-field-of-view diagram of the field curvature (meridian direction) of the optical lens group in the sixth embodiment;

[0056] Figure 28D This is a diagram showing the half-field angle of the optical lens group in the sixth embodiment, illustrating the distortion.

[0057] Figure 29 Detailed optical data of the optical lens group according to the sixth embodiment of the present invention are shown;

[0058] Figure 30 The aspherical parameters of the optical lens group according to the sixth embodiment of the present invention are shown;

[0059] Figure 31 This is a schematic diagram of the optical lens assembly according to the seventh embodiment of the present invention;

[0060] Figure 32A This is a schematic diagram of the longitudinal spherical aberration of the optical lens group in the seventh embodiment;

[0061] Figure 32B This is a half-field-of-view diagram of the field curvature (sagittal direction) of the optical lens group in the seventh embodiment;

[0062] Figure 32C This is a half-field-of-view diagram of the field curvature (meridian direction) of the optical lens group in the seventh embodiment;

[0063] Figure 32D This is a diagram showing the half-field angle of the optical lens group in the seventh embodiment, illustrating the distortion.

[0064] Figure 33 Detailed optical data of the optical lens group according to the seventh embodiment of the present invention are shown;

[0065] Figure 34 The aspherical parameters of the optical lens group according to the seventh embodiment of the present invention are shown;

[0066] Figure 35 This is a schematic diagram of the optical lens assembly according to the eighth embodiment of the present invention;

[0067] Figure 36A This is a schematic diagram of the longitudinal spherical aberration of the optical lens group in the eighth embodiment;

[0068] Figure 36B This is a half-field-of-view diagram of the field curvature (sagittal direction) of the optical lens group in the eighth embodiment;

[0069] Figure 36C This is a half-field-of-view diagram of the field curvature (meridian direction) of the optical lens group in the eighth embodiment;

[0070] Figure 36D This is a diagram showing the half-field angle of the optical lens group in the eighth embodiment, illustrating the distortion.

[0071] Figure 37 Detailed optical data of the optical lens group of the eighth embodiment of the present invention are shown;

[0072] Figure 38 The aspherical parameters of the optical lens group according to the eighth embodiment of the present invention are shown;

[0073] Figure 39 This is a schematic diagram of the optical lens assembly according to the ninth embodiment of the present invention;

[0074] Figure 40A This is a schematic diagram of the longitudinal spherical aberration of the optical lens group in the ninth embodiment;

[0075] Figure 40B This is a half-field-of-view diagram of the field curvature (sagittal direction) of the optical lens group in the ninth embodiment;

[0076] Figure 40C This is a half-field-of-view diagram of the field curvature (meridian direction) of the optical lens group in the ninth embodiment;

[0077] Figure 40D This is a diagram showing the half-field angle of the optical lens group in the ninth embodiment, illustrating the distortion.

[0078] Figure 41 Detailed optical data of the optical lens group according to the ninth embodiment of the present invention are shown;

[0079] Figure 42 The aspherical parameters of the optical lens group according to the ninth embodiment of the present invention are shown;

[0080] Figure 43 Numerical values ​​of the important parameters and their relationships of the optical lens groups in the first to ninth embodiments of the present invention are shown.

[0081] Figure 44 Numerical values ​​of the important parameters and their relationships of the optical lens groups in the first to ninth embodiments of the present invention are shown.

[0082] Figure 45 Numerical values ​​of the important parameters and their relationships of the optical lens groups in the first to ninth embodiments of the present invention are shown in section three.

[0083] Figure 46 The numerical values ​​of the important parameters and their relationships of the optical lens groups in the first to ninth embodiments of the present invention are shown in Figure 4.

[0084] Label Explanation:

[0085] 1: First lens; 2: Second lens; 3: Third lens; 4: Fourth lens; 5: Fifth lens; 6: Sixth lens;

[0086] 7: Aperture; 10: Optical lens group;

[0087] 11, 21, 31, 41, 51, 61, 110, 410, 510: Light-emitting surface;

[0088] 12, 22, 32, 42, 52, 62, 120, 320: incident light surface;

[0089] 15: Multi-source light source generation unit; 15a: Light source; 20: Projection lens;

[0090] 100, 200, 300, 400, 500: Lenses; 100a: Light-emitting surface;

[0091] 111, 121, 211, 221, 311, 321, 411, 421, 511, 521, 611, 621, Z1: Optical axis region;

[0092] 113, 123, 213, 223, 313, 323, 413, 423, 513, 523, 613, 623, Z2: Circular region;

[0093] 130: Assembly section; 211, 212: Parallel rays; a, b, c: Beam; A1: Light exit side; A2: Light entrance side;

[0094] CP: Center point; CP1: First center point; CP2: Second center point; D1, D2: Distance; EL: Extension line;

[0095] I: Optical axis; Lc: Principal ray; LCR: Radius of emission circle; Lm: Edge ray; OB: Optical boundary; M, R: Point; TP1: First conversion point / conversion point; TP2: Second conversion point; Z3: Relay region; ω: Half field of view. Detailed Implementation

[0096] Please refer to Figure 1A The light direction of the projection lens 20 is that the display light or sensing light is emitted by the multi-source light generation unit 15, and multiple light beams a, b, and c are generated by the optical lens group 10 of this embodiment of the invention to detect the environment in front of the projection lens 20. The light beams a, b, and c are not limited to any particular form; their directions are described here as dashed lines. The number of light beams a, b, and c is not limited to three; they can be any number other than three or one. Figure 1A The diagram uses light beams a, b, and c to represent the beams. Please refer to [the diagram / reference]. Figure 1B In one embodiment, the multi-light source generating unit 15 includes a plurality of light sources 15a arranged in an array. In other embodiments, these light sources 15a may be arranged in a ring or other arrangements, and the present invention is not limited thereto. The light sources 15a may be display light sources used for projecting display light. The light-emitting surfaces of these light sources 15a form the light-emitting surface 100a of the multi-light source generating unit 15.

[0097] The criteria for determining the optical specifications of the embodiments of the present invention described below are based on the assumption that the reverse tracking of the light direction is a parallel imaging ray that passes through the optical lens group 10 from the light-emitting side to the light-emitting surface 100a of the multi-source generation unit 15 for focusing and imaging.

[0098] The terms "optical axis region," "circumferential region," "concave surface," and "convex surface" used in this specification and the claims should be interpreted based on the definitions listed in this specification.

[0099] The optical lens assembly 10 of this specification includes at least one lens that receives imaging rays incident on the optical system, ranging from parallel to the optical axis to within a half-angle (HFOV) relative to the optical axis. The imaging rays are imaged on the imaging plane by the optical system. The phrase "a lens has a positive refractive index (or a negative refractive index)" means that the paraxial refractive index of the lens, calculated using Gaussian optics theory, is positive (or negative). The phrase "the light-emitting surface (or light-receiving surface) of the lens" is defined as the specific range through which the imaging rays pass on the lens surface. The imaging rays include at least two types of rays: the chief ray (Lc) and the marginal ray (Lm) (e.g., ...). Figure 2 (As shown). The light-emitting surface (or light-receiving surface) of the lens can be divided into different regions depending on the position, including the optical axis region, the circumferential region, or one or more relay regions in some embodiments, which will be described in detail below.

[0100] Figure 2 This is a radial sectional view of lens 100. Two reference points are defined on the surface of lens 100: a center point and a transition point. The center point of the lens surface is the intersection of this surface and the optical axis I. For example... Figure 2 As illustrated, the first center point CP1 is located on the light-emitting surface 110 of lens 100, and the second center point CP2 is located on the light-receiving surface 120 of lens 100. A transition point is a point on the lens surface whose tangent is perpendicular to the optical axis I. The optical boundary OB of the lens surface is defined as the point where the outermost radially outermost edge ray Lm passing through the lens surface intersects the lens surface. All transition points are located between the optical axis I and the optical boundary OB of the lens surface. In addition, the surface of lens 100 may have no transition points or at least one transition point. If a single lens surface has multiple transition points, these transition points are named sequentially from the first transition point in the radially outward direction. For example, the first transition point TP1 (closest to the optical axis I), the second transition point TP2 (as shown in the example), and the third transition point TP2 (as shown in the example) are named sequentially from the first transition point in the radially outward direction. Figure 5 (as shown) and the Nth conversion point (farthest from optical axis I).

[0101] When the lens surface has at least one transition point, the region from the center point to the first transition point TP1 is defined as the optical axis region, which includes the center point. The region radially outward from the transition point farthest from optical axis I (the Nth transition point) to the optical boundary OB is defined as the circumferential region. In some embodiments, a relay region may be included between the optical axis region and the circumferential region; the number of relay regions depends on the number of transition points. When the lens surface does not have a transition point, 0% to 50% of the distance from optical axis I to the optical boundary OB of the lens surface is defined as the optical axis region, and 50% to 100% of the distance from optical axis I to the optical boundary OB of the lens surface is defined as the circumferential region.

[0102] When a ray parallel to optical axis I passes through a region, if the ray bends towards optical axis I and the intersection point with optical axis I is located on the light-incident side A2 of the lens, then that region is a convex surface. When a ray parallel to optical axis I passes through a region, if the extension of the ray intersects optical axis I at the light-outceasing side A1 of the lens, then that region is a concave surface.

[0103] In addition, see Figure 2 The lens 100 may also include an assembly portion 130 extending radially outward from the optical boundary OB. The assembly portion 130 is generally used for assembling the lens 100 into a corresponding component of an optical system (not shown). Imaging rays do not reach the assembly portion 130. The structure and shape of the assembly portion 130 are merely illustrative examples of the invention and are not intended to limit the scope of the invention. The assembly portion 130 of the lens discussed below may be partially or entirely omitted in the drawings.

[0104] See Figure 3 Define the region between the center point CP and the first conversion point TP1 as the optical axis region Z1. Define the region between the first conversion point TP1 and the optical boundary OB of the lens surface as the circumferential region Z2. For example... Figure 3 As shown, parallel ray 211 intersects optical axis I at the incident side A2 of lens 200 after passing through optical axis region Z1. That is, the focal point of parallel ray 211 passing through optical axis region Z1 is located at point R on the incident side A2 of lens 200. Since the ray intersects optical axis I at the incident side A2 of lens 200, optical axis region Z1 is convex. Conversely, parallel ray 212 diverges after passing through circular region Z2. Figure 3 As shown, the extension EL of parallel ray 212 after passing through the circular region Z2 intersects the optical axis I at the light-emitting side A1 of the lens 200. That is, the focal point of parallel ray 212 after passing through the circular region Z2 is located at point M on the light-emitting side A1 of the lens 200. Since the extension EL of the ray intersects the optical axis I at the light-emitting side A1 of the lens 200, the circular region Z2 is concave. Figure 3 In the lens 200 shown, the first conversion point TP1 is the boundary between the optical axis region and the circumferential region, that is, the first conversion point TP1 is the boundary point between the convex surface and the concave surface.

[0105] On the other hand, the convexity / concavity of the optical axis region can also be determined using the method commonly used by those knowledgeable in the field: judging the convexity / concavity of the lens's optical axis region by the sign of the paraxial radius of curvature (R-value). The R-value is commonly used in optical design software, such as Zemax or CodeV. It is also frequently found in lens data sheets within optical design software. For the light-emitting surface, a positive R-value indicates a convex optical axis region; a negative R-value indicates a concave optical axis region. Conversely, for the light-receiving surface, a positive R-value indicates a concave optical axis region; a negative R-value indicates a convex optical axis region. The result of this method is consistent with the aforementioned method of determining the convexity / concavity by the intersection of a ray / ray extension with the optical axis, where the focal point of a ray parallel to the optical axis is located on either the light-emitting or light-receiving side of the lens. The terms "a region is convex (or concave)," "a region is convex (or concave)," or "a convex (or concave) region" used in this specification may be used interchangeably.

[0106] Figures 4 to 6 Examples of determining the surface shape and boundaries of the lens region in various situations are provided, including the aforementioned optical axis region, circumferential region, and relay region.

[0107] Figure 4 This is a radial sectional view of lens 300. See also... Figure 4 The incident surface 320 of lens 300 has only one transition point TP1 within the optical boundary OB. The optical axis region Z1 and circumferential region Z2 of the incident surface 320 of lens 300 are as follows: Figure 4 As shown. The R value of this incident light surface 320 is positive (i.e., R>0), therefore, the optical axis region Z1 is concave.

[0108] Generally, the surface shape of each region bounded by a transition point will be opposite to that of its adjacent regions. Therefore, the transition point can be used to define the change in surface shape, i.e., from the transition point, a surface changes from concave to convex or from convex to concave. Figure 4 In the middle, since the optical axis region Z1 is concave and its shape changes at the transition point TP1, the circumferential region Z2 is convex.

[0109] Figure 5 This is a radial sectional view of lens 400. See also... Figure 5 The light-emitting surface 410 of lens 400 has a first conversion point TP1 and a second conversion point TP2. The area between the optical axis I and the first conversion point TP1 is defined as the optical axis region Z1 of the light-emitting surface 410. The R value of this light-emitting surface 410 is positive (i.e., R>0), therefore, the optical axis region Z1 is a convex surface.

[0110] A circular region Z2 is defined between the second conversion point TP2 and the optical boundary OB of the light-emitting surface 410 of the lens 400. This circular region Z2 of the light-emitting surface 410 is also a convex surface. Furthermore, a relay region Z3 is defined between the first conversion point TP1 and the second conversion point TP2. This relay region Z3 of the light-emitting surface 410 is a concave surface. See again. Figure 5 The light-emitting surface 410, radially outward from the optical axis I, sequentially includes the optical axis region Z1 between the optical axis I and the first conversion point TP1, the relay region Z3 located between the first conversion point TP1 and the second conversion point TP2, and the circumferential region Z2 between the second conversion point TP2 and the optical boundary OB of the light-emitting surface 410 of the lens 400. Since the optical axis region Z1 is convex, and its surface shape changes to concave from the first conversion point TP1, the relay region Z3 is concave. And since its surface shape changes to convex again from the second conversion point TP2, the circumferential region Z2 is convex.

[0111] Figure 6 This is a radial sectional view of lens 500. The light-emitting surface 510 of lens 500 has no transition point. For a lens surface without a transition point, such as the light-emitting surface 510 of lens 500, the region from 0% to 50% of the distance measured from the optical axis I to the optical boundary OB of the lens surface is defined as the optical axis region, and the region from 50% to 100% of the distance measured from the optical axis I to the optical boundary OB of the lens surface is defined as the circumferential region. See also... Figure 6 The lens 500 shown defines the optical axis region Z1 of the light-emitting surface 510 as 50% of the distance from the optical axis I to the optical boundary OB of the lens 500 surface. The R value of this light-emitting surface 510 is positive (i.e., R > 0), therefore, the optical axis region Z1 is convex. Since the light-emitting surface 510 of the lens 500 has no transition point, the circumferential region Z2 of the light-emitting surface 510 is also convex. The lens 500 may further have an assembly portion (not shown) extending radially outward from the circumferential region Z2.

[0112] Figure 7 This is a schematic diagram of the optical lens assembly according to the first embodiment of the present invention. Figures 8A to 8D This is a diagram showing the longitudinal spherical aberration and various aberrations of the optical lens group in the first embodiment. Please refer to [the diagram first]. Figure 7The optical lens group 10 of the first embodiment of the present invention is applicable to a projection lens. The optical lens group 10 includes, sequentially along an optical axis I from the light-emitting side A1 to the light-incident side A2, an aperture 7, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, and a sixth lens 6. When the light-emitting surface 100a of the multi-source generating unit 15 emits light, it enters the optical lens group 10 and sequentially passes through the sixth lens 6, the fifth lens 5, the fourth lens 4, the third lens 3, the second lens 2, the first lens 1, and the aperture 7 to generate multiple light beams, which then exit the optical lens group 10. It should be noted that the light-incident side A2 is the side facing the multi-source generating unit 15, while the opposite side is the light-emitting side A1. It is worth mentioning that in the optical lens group 10, only the above six lenses have refractive power, namely the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5 and the sixth lens 6, and the materials of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5 and the sixth lens 6 can be plastic or glass.

[0113] In this embodiment, the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5 and the sixth lens 6 of the optical lens group 10 each include a light-emitting surface 11, 21, 31, 41, 51, 61 facing the light-emitting side A1 and a light-incident surface 12, 22, 32, 42, 52, 62 facing the light-incident side A2.

[0114] The first lens 1 has a positive refractive index. The first lens 1 is made of plastic (e.g., EP-9000_21). The optical axis region 111 of the light-emitting surface 11 of the first lens 1 is convex, and the circumferential region 113 of the light-emitting surface 11 of the first lens 1 is also convex. The optical axis region 121 of the light-incident surface 12 of the first lens 1 is concave, and the circumferential region 123 of the light-incident surface 12 of the first lens 1 is also concave. In this embodiment, both the light-emitting surface 11 and the light-incident surface 12 of the first lens 1 are aspherical surfaces, but the present invention is not limited thereto.

[0115] The second lens 2 has a positive refractive index. The material of the second lens 2 is glass (e.g., M-TAF101). The optical axis region 211 of the light-emitting surface 21 of the second lens 2 is convex, and the circumferential region 213 of the light-emitting surface 21 of the second lens 2 is also convex. The optical axis region 221 of the light-incident surface 22 of the second lens 2 is concave, and the circumferential region 223 of the light-incident surface 22 of the second lens 2 is also concave. In this embodiment, both the light-emitting surface 21 and the light-incident surface 22 of the second lens 2 are aspherical, but the present invention is not limited thereto.

[0116] The third lens 3 has a positive refractive index. The third lens 3 is made of plastic (e.g., APL5014CL). The optical axis region 311 of the light-emitting surface 31 of the third lens 3 is convex, and the circumferential region 313 of the light-emitting surface 31 of the third lens 3 is also convex. The optical axis region 321 of the light-incident surface 32 of the third lens 3 is convex, and the circumferential region 323 of the light-incident surface 32 of the third lens 3 is also convex. In this embodiment, both the light-emitting surface 31 and the light-incident surface 32 of the third lens 3 are aspherical, but the invention is not limited thereto.

[0117] The fourth lens 4 has a negative refractive index. The fourth lens 4 is made of plastic (e.g., EP-8000_21). The optical axis region 411 of the light-emitting surface 41 of the fourth lens 4 is concave, and the circumferential region 413 of the light-emitting surface 41 of the fourth lens 4 is also concave. The optical axis region 421 of the light-incident surface 42 of the fourth lens 4 is concave, and the circumferential region 423 of the light-incident surface 42 of the fourth lens 4 is convex. In this embodiment, both the light-emitting surface 41 and the light-incident surface 42 of the fourth lens 4 are aspherical, but the invention is not limited thereto.

[0118] The fifth lens 5 has a positive refractive index. The fifth lens 5 is made of plastic (e.g., APL5014CL). The optical axis region 511 of the light-emitting surface 51 of the fifth lens 5 is convex, and the circumferential region 513 of the light-emitting surface 51 of the fifth lens 5 is concave. The optical axis region 521 of the light-incident surface 52 of the fifth lens 5 is concave, and the circumferential region 523 of the light-incident surface 52 of the fifth lens 5 is convex. In this embodiment, both the light-emitting surface 51 and the light-incident surface 52 of the fifth lens 5 are aspherical, but the invention is not limited thereto.

[0119] The sixth lens 6 has a negative refractive index. The sixth lens 6 is made of plastic (e.g., ZEONEX-K26R_17). The optical axis region 611 of the light-emitting surface 61 of the sixth lens 6 is convex, and the circumferential region 613 of the light-emitting surface 61 of the sixth lens 6 is concave. The optical axis region 621 of the light-incident surface 62 of the sixth lens 6 is concave, and the circumferential region 623 of the light-incident surface 62 of the sixth lens 6 is convex. In this embodiment, both the light-emitting surface 61 and the light-incident surface 62 of the sixth lens 6 are aspherical, but the invention is not limited thereto.

[0120] Other detailed optical data for the first embodiment are as follows: Figure 9As shown, the system focal length (EFL) of the optical lens group 10 in the first embodiment is 3.209 mm, the half field of view (HFOV) is 37.200°, the system length is 4.454 mm, the aperture number (F-number, Fno) is 1.550, and the image height is 2.056 mm. The system length refers to the distance along the optical axis I from the light-emitting surface 11 of the first lens 1 to the light-emitting surface 100a. The "aperture number" in this specification is calculated based on the principle of the reversibility of light, taking the aperture 7 as the entrance pupil.

[0121] In this embodiment, the light-emitting surfaces 11, 21, 31, 41, 51, 61 and the light-incident surfaces 12, 22, 32, 42, 52, 62 of the first lens 1, second lens 2, third lens 3, fourth lens 4, fifth lens 5 and sixth lens 6, totaling twelve surfaces, are aspherical. Among them, the light-emitting surfaces 11, 21, 31, 41, 51, 61 and the light-incident surfaces 12, 22, 32, 42, 52, 62 are general even-order aspheric surfaces. These aspherical surfaces are defined according to formula (1):

[0122]

[0123] in:

[0124] Y: The distance between a point on the aspherical curve and the optical axis I;

[0125] Z: Depth of the aspherical surface (the perpendicular distance between a point on the aspherical surface that is Y away from the optical axis I and the tangent plane that is tangent to the vertex on the optical axis I of the aspherical surface).

[0126] R: Radius of curvature of the lens surface;

[0127] K: Conic constant;

[0128] a i : The i-th order aspherical coefficient.

[0129] The lens material parameters disclosed in the optical parameter table of the embodiments are in the international glass code format of nd refractive index and Vd Abbe number, so that those skilled in the art can know the specific material implementation. Here, nd is the refractive index of the material at the d-helium yellow line of 587.56 nanometers, and Vd is calculated based on the refractive index of the material at the d, F, and C wavelengths of the Fraunhofer spectrum.

[0130] The focal length values ​​disclosed in the optical parameter table of the embodiments are calculated based on the refractive index of the band in which the optical system is implemented. Since the primary wavelength of the embodiments of the present invention is 525nm, the focal length values ​​of the present invention are calculated based on the refractive index of the material at 525nm.

[0131] The aspherical coefficients of the light-exiting surface 11 of the first lens 1 to the light-incident surface 62 of the sixth lens 6 in formula (1) are as follows: Figure 10 As shown. Among them, Figure 10 The field number 11 indicates that it is the aspherical coefficient of the light-emitting surface 11 of the first lens 1, and the other fields follow the same pattern.

[0132] Furthermore, the relationships between the important parameters in the optical lens group 10 of the first embodiment are as follows: Figure 43 , Figure 45 As shown, in Figures 43 to 46 The unit for each parameter is millimeters (mm). In this paper, each parameter is defined as follows:

[0133] T1 is the thickness of the first lens 1 on the optical axis I;

[0134] T2 is the thickness of the second lens 2 on the optical axis I;

[0135] T3 is the thickness of the third lens 3 on the optical axis I;

[0136] T4 is the thickness of the fourth lens 4 on optical axis I;

[0137] T5 is the thickness of the fifth lens 5 on optical axis I;

[0138] T6 is the thickness of the sixth lens 6 on optical axis I;

[0139] G12 is the air gap between the first lens 1 and the second lens 2 on the optical axis I;

[0140] G23 is the air gap between the second lens 2 and the third lens 3 on the optical axis I;

[0141] G34 is the air gap between the third lens 3 and the fourth lens 4 on the optical axis I;

[0142] G45 is the air gap between the fourth lens 4 and the fifth lens 5 on the optical axis I;

[0143] G56 is the air gap between the fifth lens 5 and the sixth lens 6 on the optical axis I;

[0144] AAG is the sum of the five air gaps on the optical axis I from the first lens 1 to the sixth lens 6, namely the sum of G12, G23, G34, G45 and G56;

[0145] ALT is the sum of the six thicknesses of the first lens 1 to the sixth lens 6 on the optical axis I, namely the sum of T1, T2, T3, T4, T5 and T6;

[0146] D21t32 is the distance from the light-exiting surface 21 of the second lens 2 to the light-incident surface 32 of the third lens 3, which is the sum of T2, G23 and T3;

[0147] D11t21 is the distance from the light-emitting surface 11 of the first lens 1 to the light-emitting surface 21 of the second lens 2, which is the sum of T1 and G12;

[0148] TL is the distance on the optical axis I from the light-emitting surface 11 of the first lens 1 to the light-incident surface 62 of the sixth lens 6;

[0149] TTL is the distance on the optical axis I from the light-emitting surface 11 to the light-emitting surface 100a of the first lens 1.

[0150] BFL is the distance on the optical axis I from the incident surface 62 to the emitting surface 100a of the sixth lens 6.

[0151] LCR (Light circle radius) is the radius of the light-emitting circle (denoted as LCR, e.g., ...). Figure 1B (As shown in the drawing), is the radius of the smallest circumscribed circle of the light-emitting surface 100a of the multi-light source generating unit 15, and is also the image height of the optical lens group 10;

[0152] HFOV is the half field of view angle (denoted as ω, e.g.) Figure 1A (As shown in the diagram), this represents the maximum half-angle of light emission from the optical lens group 10;

[0153] Fno is the aperture value, which is calculated based on the principle of the reversibility of light to determine the effective aperture of the parallel light emitted by the optical lens group 10.

[0154] EFL is the effective focal length of optical lens group 10.

[0155] Furthermore, redefine:

[0156] G6P is the air gap between the incident surface 62 and the emitting surface 100a of the sixth lens 6 on the optical axis I.

[0157] f1 is the focal length of the first lens 1;

[0158] f2 is the focal length of the second lens 2;

[0159] f3 is the focal length of the third lens 3;

[0160] f4 is the focal length of the fourth lens 4;

[0161] f5 is the focal length of the fifth lens 5;

[0162] f6 is the focal length of the sixth lens 6;

[0163] n1 is the nd refractive index of the first lens 1;

[0164] n2 is the nd refractive index of the second lens 2;

[0165] n3 is the nd refractive index of the third lens 3;

[0166] n4 is the nd refractive index of the fourth lens 4;

[0167] n5 is the nd refractive index of the fifth lens 5;

[0168] n6 is the nd refractive index of the sixth lens 6;

[0169] V1 is the Abbe number of the first lens 1, Vd;

[0170] V2 is the Abbe number of the second lens 2, Vd;

[0171] V3 is the Abbe number of the third lens 3;

[0172] V4 is the Abbe number of the fourth lens 4;

[0173] V5 is the Abbe number of the fifth lens 5; and

[0174] V6 is the Abbe number of the sixth lens 6.

[0175] See also Figures 8A to 8D , Figure 8A The diagram illustrates the longitudinal spherical aberration of the emitting surface 100a in the first embodiment when its pupil radius is 1.0350 mm and its wavelengths are 507 nm, 525 nm, and 543 nm. Figure 8B and Figure 8C The diagrams illustrate the field curvature aberrations in the sagittal and tangential directions on the emitting surface 100a of the first embodiment when the wavelengths are 507 nm, 525 nm, and 543 nm. Figure 8D The diagram illustrates the distortion aberration on the emitting surface 100a of the first embodiment at wavelengths of 507 nm, 525 nm, and 543 nm. Figure 8AIn the longitudinal spherical aberration diagram, the curves formed by each wavelength are very close and move towards the center, indicating that off-axis rays of different heights for each wavelength are concentrated near the imaging point. From the skewing of the curves for each wavelength, it can be seen that the imaging point deviation of off-axis rays of different heights is controlled within the range of ±0.025 mm. Therefore, this first embodiment does significantly improve the spherical aberration of the same wavelength. In addition, the distances between the three representative wavelengths are also quite close, indicating that the imaging positions of different wavelength rays are quite concentrated, thus significantly improving chromatic aberration.

[0176] exist Figure 8B and Figure 8C In the two field curvature aberration diagrams, the focal length variation of the three representative wavelengths falls within ±0.18 mm across the entire field of view, indicating that the optical lens group of this first embodiment can effectively eliminate aberrations. Figure 8D The distortion aberration diagram shows that the distortion aberration of the first embodiment is maintained within the range of ±16%, indicating that the distortion aberration of the first embodiment meets the imaging quality requirements of the optical lens group. Based on this, it can be seen that the first embodiment can still provide good imaging quality compared with existing optical lenses, even with the system length shortened to about 4.454 mm. Therefore, the first embodiment can shorten the length of the optical lens group while maintaining good optical performance.

[0177] Figure 11 This is a schematic diagram of the optical lens assembly according to the second embodiment of the present invention. Figures 12A to 12D This is a diagram showing the longitudinal spherical aberration and various aberrations of the optical lens group in the second embodiment. Please refer to [the diagram first]. Figure 11 A second embodiment of the optical lens group 10 of the present invention is generally similar to the first embodiment, but the differences are as follows: the optical data, aspherical coefficients, and parameters between these lenses (e.g., the first lens 1 to the sixth lens 6) are more or less different. Furthermore, in this embodiment, the circumferential region 423 of the light-incident surface 42 of the fourth lens 4 is concave. It should be noted that, for clearer illustration, Figure 11 The labels for the optical axis region and the circumferential region that are similar in shape to the first embodiment are omitted.

[0178] Detailed optical data of the optical lens group 10 in the second embodiment are as follows: Figure 13 As shown, the optical lens group 10 of the second embodiment has a system focal length of 3.172 mm, a half field of view (HFOV) of 37.200°, a system length of 4.445 mm, an aperture value (Fno) of 1.532, and an image height of 2.048 mm.

[0179] Figure 14 The aspherical coefficients of the light-emitting surface 11 of the first lens 1 to the light-incident surface 62 of the sixth lens 6 in the second embodiment are shown in formula (1).

[0180] Furthermore, the relationships between the important parameters in the optical lens group 10 of the second embodiment are as follows: Figure 43 , Figure 45 As shown.

[0181] The longitudinal spherical aberration of this second embodiment is as follows: Figure 12A As shown, the imaging point deviation of off-axis rays at different heights is controlled within ±0.025 mm. Figure 12B and Figure 12C In the two field curvature aberration diagrams, the focal length variation of the three representative wavelengths falls within ±0.16 mm across the entire field of view. Figure 12D The distortion aberration diagram shows that the distortion aberration of this second embodiment is maintained within the range of ±16%.

[0182] As can be seen from the above description, the system length of the second embodiment is shorter than that of the first embodiment. The longitudinal spherical aberration and field curvature aberration of the second embodiment are superior to those of the first embodiment.

[0183] Figure 15 This is a schematic diagram of the optical lens assembly according to the third embodiment of the present invention. Figures 16A to 16D This is a diagram showing the longitudinal spherical aberration and various aberrations of the optical lens group in the third embodiment. Please refer to [the diagram first]. Figure 15 A third embodiment of the optical lens group 10 of the present invention is generally similar to the first embodiment, but the differences are as follows: the optical data, aspherical coefficients, and parameters between these lenses (e.g., the first lens 1 to the sixth lens 6) are more or less different. Furthermore, in this embodiment, the circumferential region 423 of the light-incident surface 42 of the fourth lens 4 is concave. It should be noted that, for clearer illustration, Figure 15 The labels for the optical axis region and the circumferential region that are similar in shape to the first embodiment are omitted.

[0184] Detailed optical data of the optical lens group 10 in the third embodiment are as follows: Figure 17 As shown, the optical lens group 10 of the third embodiment has a system focal length of 3.743 mm, a half field of view (HFOV) of 37.200°, a system length of 4.911 mm, an aperture value (Fno) of 1.808, and an image height of 2.403 mm.

[0185] Figure 18 The aspherical coefficients of the light-emitting surface 11 of the first lens 1 to the light-incident surface 62 of the sixth lens 6 in the third embodiment are shown in formula (1).

[0186] Furthermore, the relationships between the important parameters in the optical lens group 10 of the third embodiment are as follows: Figure 43 , Figure 45 As shown.

[0187] The longitudinal spherical aberration of this third embodiment is as follows: Figure 16A As shown, the imaging point deviation of off-axis rays at different heights is controlled within ±0.025 mm. Figure 16B and Figure 16C In the two field curvature aberration diagrams, the focal length variation of the three representative wavelengths falls within ±0.20 mm across the entire field of view. Figure 16D The distortion aberration diagram shows that the distortion aberration of this second embodiment is maintained within the range of ±16%. Furthermore, the third embodiment also has a larger image height.

[0188] Figure 19 This is a schematic diagram of the optical lens assembly according to the fourth embodiment of the present invention. Figures 20A to 20D This is a diagram showing the longitudinal spherical aberration and various aberrations of the optical lens group in the fourth embodiment. Please refer to [the diagram first]. Figure 19 This invention provides a fourth embodiment of the optical lens group 10, which is generally similar to the first embodiment, but differs from the first embodiment in that the optical data, aspherical coefficients, and parameters between these lenses (e.g., the first lens 1 to the sixth lens 6) are somewhat different. Furthermore, in this embodiment, the first lens 1 has a negative refractive index. The fourth lens 4 has a positive refractive index. The optical axis region 411 of the light-emitting surface 41 of the fourth lens 4 is convex, and the circumferential region 423 of the light-incident surface 42 of the fourth lens 4 is concave. It should be noted that, for clear visualization of the figures, Figure 19 The labels for the optical axis region and the circumferential region that are similar in shape to the first embodiment are omitted.

[0189] Detailed optical data of the optical lens group 10 in the fourth embodiment are as follows: Figure 21 As shown, the optical lens group 10 of the fourth embodiment has a system focal length of 3.221 mm, a half field of view (HFOV) of 37.200°, a system length of 4.619 mm, an aperture value (Fno) of 1.556, and an image height of 2.139 mm.

[0190] Figure 22 The aspherical coefficients of the light-emitting surface 11 of the first lens 1 to the light-incident surface 62 of the sixth lens 6 in the fourth embodiment are shown in formula (1).

[0191] Furthermore, the relationships between the important parameters in the optical lens group 10 of the fourth embodiment are as follows: Figure 43 , Figure 45 As shown.

[0192] The longitudinal spherical aberration of this fourth embodiment is as follows: Figure 20A As shown, the imaging point deviation of off-axis rays at different heights is controlled within ±0.030 mm. Figure 20B and Figure 20CIn the two field curvature aberration diagrams, the focal length variation of the three representative wavelengths falls within ±0.03 mm across the entire field of view. Figure 20D The distortion aberration diagram shows that the distortion aberration of this second embodiment is maintained within the range of ±14%.

[0193] As can be seen from the above description, the field curvature aberration and distortion aberration of the fourth embodiment are superior to those of the first embodiment. Furthermore, the fourth embodiment also has a larger image height.

[0194] Figure 23 This is a schematic diagram of the optical lens assembly according to the fifth embodiment of the present invention. Figures 24A to 24D This is a diagram showing the longitudinal spherical aberration and various aberrations of the optical lens group in the fifth embodiment. Please refer to [the diagram first]. Figure 23 This invention provides a fifth embodiment of the optical lens group 10, which is generally similar to the first embodiment, but differs from the first embodiment in that the optical data, aspherical coefficients, and parameters between these lenses (e.g., the first lens 1 to the sixth lens 6) are more or less different. Furthermore, in this embodiment, the first lens 1 has a negative refractive index. The fourth lens 4 has a positive refractive index. The optical axis region 411 of the light-emitting surface 41 of the fourth lens 4 is convex, and the circumferential region 423 of the light-incident surface 42 of the fourth lens 4 is concave. It should be noted that, for clear visualization of the figures, Figure 23 The labels for the optical axis region and the circumferential region that are similar in shape to the first embodiment are omitted.

[0195] Detailed optical data of the optical lens group 10 in the fifth embodiment are as follows: Figure 25 As shown, the optical lens group 10 of the fifth embodiment has a system focal length of 3.145 mm, a half field of view (HFOV) of 37.200°, a system length of 4.548 mm, an aperture value (Fno) of 1.519, and an image height of 2.070 mm.

[0196] Figure 26 The aspherical coefficients of the light-emitting surface 11 of the first lens 1 to the light-incident surface 62 of the sixth lens 6 in the fifth embodiment are shown in formula (1).

[0197] Furthermore, the relationships between the important parameters in the optical lens group 10 of the fifth embodiment are as follows: Figure 43 , Figure 45 As shown.

[0198] The longitudinal spherical aberration of this fifth embodiment is as follows: Figure 24A As shown, the imaging point deviation of off-axis rays at different heights is controlled within ±0.008 mm. Figure 24B and Figure 24C In the two field curvature aberration diagrams, the focal length variation of the three representative wavelengths falls within ±0.05 mm across the entire field of view. Figure 24DThe distortion aberration diagram shows that the distortion aberration of this second embodiment is maintained within the range of ±14%.

[0199] As can be seen from the above description, the fifth embodiment has better longitudinal spherical aberration, field curvature aberration, and distortion aberration than the first embodiment. Furthermore, the fifth embodiment also has a larger image height.

[0200] Figure 27 This is a schematic diagram of the optical lens assembly according to the sixth embodiment of the present invention. Figures 28A to 28D This is a diagram showing the longitudinal spherical aberration and various aberrations of the optical lens group in the sixth embodiment. Please refer to [the diagram first]. Figure 27 This is a sixth embodiment of the optical lens group 10 of the present invention, which is generally similar to the first embodiment, but the differences are as follows: the optical data, aspherical coefficients, and parameters between these lenses (e.g., the first lens 1 to the sixth lens 6) are more or less different. Furthermore, in this embodiment, the first lens 1 has a negative refractive index. The circumferential region 223 of the incident surface 22 of the second lens 2 is convex. The fourth lens 4 has a positive refractive index. The optical axis region 411 of the exit surface 41 of the fourth lens 4 is convex, and the circumferential region 423 of the incident surface 42 of the fourth lens 4 is concave. It should be noted that, for clear illustration of the figures, Figure 27 The labels for the optical axis region and the circumferential region that are similar in shape to the first embodiment are omitted.

[0201] Detailed optical data of the optical lens group 10 in the sixth embodiment are as follows: Figure 29 As shown, the optical lens group 10 of the sixth embodiment has a system focal length of 3.224 mm, a half field of view (HFOV) of 37.200°, a system length of 4.616 mm, an aperture value (Fno) of 1.558, and an image height of 2.104 mm.

[0202] Figure 30 The aspherical coefficients of the light-emitting surface 11 of the first lens 1 to the light-incident surface 62 of the sixth lens 6 in formula (1) are shown.

[0203] Furthermore, the relationships between the important parameters in the optical lens group 10 of the sixth embodiment are as follows: Figure 44 , Figure 46 As shown.

[0204] The longitudinal spherical aberration of this sixth embodiment is as follows: Figure 28A As shown, the imaging point deviation of off-axis rays at different heights is controlled within ±0.009 mm. Figure 28B and Figure 28C In the two field curvature aberration diagrams, the focal length variation of the three representative wavelengths falls within ±0.05 mm across the entire field of view. Figure 28D The distortion aberration diagram shows that the distortion aberration of this second embodiment is maintained within the range of ±14%.

[0205] As can be seen from the above description, the sixth embodiment has better longitudinal spherical aberration, field curvature aberration, and distortion aberration than the first embodiment. Furthermore, the sixth embodiment also has a larger image height.

[0206] Figure 31 This is a schematic diagram of the optical lens assembly according to the seventh embodiment of the present invention. Figures 32A to 32D This is a diagram showing the longitudinal spherical aberration and various aberrations of the optical lens group in the seventh embodiment. Please refer to [the diagram first]. Figure 31 This invention provides a seventh embodiment of the optical lens group 10, which is generally similar to the first embodiment, but differs from the first embodiment in the following ways: the optical data, aspherical coefficients, and parameters between these lenses (e.g., the first lens 1 to the sixth lens 6) are somewhat different. Furthermore, in this embodiment, the first lens 1 has a negative refractive index. The circumferential region 223 of the incident surface 22 of the second lens 2 is convex. The fourth lens 4 has a positive refractive index. The optical axis region 411 of the exit surface 41 of the fourth lens 4 is convex, and the circumferential region 423 of the incident surface 42 of the fourth lens 4 is concave. It should be noted that, for clear visualization of the figures, Figure 31 The labels for the optical axis region and the circumferential region that are similar in shape to the first embodiment are omitted.

[0207] Detailed optical data of the optical lens group 10 in the seventh embodiment are as follows: Figure 33 As shown, the optical lens group 10 of the seventh embodiment has a system focal length of 3.372 mm, a half field of view (HFOV) of 37.200°, a system length of 4.720 mm, an aperture value (Fno) of 1.629, and an image height of 2.190 mm.

[0208] Figure 34 The aspherical coefficients of the light-emitting surface 11 of the first lens 1 to the light-incident surface 62 of the sixth lens 6 in the seventh embodiment are shown in formula (1).

[0209] Furthermore, the relationships between the important parameters in the optical lens group 10 of the seventh embodiment are as follows: Figure 44 , Figure 46 As shown.

[0210] The longitudinal spherical aberration of this seventh embodiment is as follows: Figure 32A As shown, the imaging point deviation of off-axis rays at different heights is controlled within ±0.014 mm. Figure 32B and Figure 32C In the two field curvature aberration diagrams, the focal length variation of the three representative wavelengths falls within ±0.06 mm across the entire field of view. Figure 32D The distortion aberration diagram shows that the distortion aberration of this second embodiment is maintained within the range of ±14%.

[0211] As can be seen from the above description, the seventh embodiment has better longitudinal spherical aberration, field curvature aberration, and distortion aberration than the first embodiment. Furthermore, the seventh embodiment also has a larger image height.

[0212] Figure 35 This is a schematic diagram of the optical lens group of the eighth embodiment of the present invention. Figures 36A to 36D This is a diagram showing the longitudinal spherical aberration and various aberrations of the optical lens group in the eighth embodiment. Please refer to [the diagram first]. Figure 35 This is an eighth embodiment of the optical lens group 10 of the present invention, which is generally similar to the first embodiment, but the differences are as follows: the optical data, aspherical coefficients, and parameters between these lenses (e.g., the first lens 1 to the sixth lens 6) are more or less different. Furthermore, in this embodiment, the first lens 1 has a negative refractive index. The circumferential region 223 of the light-incident surface 22 of the second lens 2 is convex. The circumferential region 323 of the light-incident surface 32 of the third lens 3 is concave. The circumferential region 413 of the light-exit surface 41 of the fourth lens 4 is convex, the optical axis region 421 of the light-incident surface 42 of the fourth lens 4 is convex, and the circumferential region 423 of the light-incident surface 42 of the fourth lens 4 is concave. The sixth lens 6 has a positive refractive index. It should be noted that, for clearer illustration, Figure 35 The labels for the optical axis region and the circumferential region that are similar in shape to the first embodiment are omitted.

[0213] Detailed optical data of the optical lens group 10 in the eighth embodiment are as follows: Figure 37 As shown, the optical lens group 10 of the eighth embodiment has a system focal length of 3.011 mm, a half field of view (HFOV) of 37.200°, a system length of 4.333 mm, an aperture value (Fno) of 1.454, and an image height of 2.283 mm.

[0214] Figure 38 The aspherical coefficients of the light-emitting surface 11 of the first lens 1 to the light-incident surface 62 of the sixth lens 6 in the eighth embodiment are shown in formula (1).

[0215] Furthermore, the relationships between the important parameters in the optical lens group 10 of the eighth embodiment are as follows: Figure 44 , Figure 46 As shown.

[0216] The longitudinal spherical aberration of this eighth embodiment is as follows: Figure 36A As shown, the imaging point deviation of off-axis rays at different heights is controlled within ±0.012 mm. Figure 36B and Figure 36C In the two field curvature aberration diagrams, the focal length variation of the three representative wavelengths falls within ±0.12 mm across the entire field of view. Figure 36D The distortion aberration diagram shows that the distortion aberration of this second embodiment is maintained within the range of ±5%.

[0217] As can be seen from the above description, the system length of the eighth embodiment is shorter than that of the first embodiment. The longitudinal spherical aberration, field curvature aberration, and distortion aberration of the eighth embodiment are superior to those of the first embodiment. Furthermore, the eighth embodiment also has a larger image height.

[0218] Figure 39 This is a schematic diagram of the optical lens assembly of the ninth embodiment of the present invention. Figures 40A to 40D This is a diagram showing the longitudinal spherical aberration and various aberrations of the optical lens group in the ninth embodiment. Please refer to [the diagram first]. Figure 39 This is a ninth embodiment of the optical lens group 10 of the present invention, which is generally similar to the first embodiment, but the differences are as follows: the optical data, aspherical coefficients, and parameters between these lenses (e.g., the first lens 1 to the sixth lens 6) are more or less different. Furthermore, in this embodiment, the first lens 1 has a negative refractive index. The circumferential region 113 of the light-emitting surface 11 of the first lens 1 is concave. The optical axis region 221 of the light-incident surface 22 of the second lens 2 is convex, and the circumferential region 223 of the light-incident surface 22 of the second lens 2 is convex. The third lens 3 has a negative refractive index. The optical axis region 311 of the light-emitting surface 31 of the third lens 3 is concave, and the optical axis region 321 of the light-incident surface 32 of the third lens 3 is concave. The optical axis region 411 of the light-emitting surface 41 of the fourth lens 4 is convex, and the circumferential region 423 of the light-incident surface 42 of the fourth lens 4 is concave. It should be noted that, for clearer illustration of the figures, Figure 39 The labels for the optical axis region and the circumferential region that are similar in shape to the first embodiment are omitted.

[0219] Detailed optical data of the optical lens group 10 in the ninth embodiment are as follows: Figure 41 As shown, the optical lens group 10 of the ninth embodiment has a system focal length of 3.131 mm, a half field of view (HFOV) of 37.200°, a system length of 4.518 mm, an aperture value (Fno) of 1.513, and an image height of 2.119 mm.

[0220] Figure 42 The aspherical coefficients of the light-emitting surface 11 of the first lens 1 to the light-incident surface 62 of the sixth lens 6 in the ninth embodiment are shown in formula (1).

[0221] Furthermore, the relationships between the important parameters in the optical lens group 10 of the ninth embodiment are as follows: Figure 44 , Figure 46 As shown.

[0222] The longitudinal spherical aberration of this ninth embodiment is as follows: Figure 40A As shown, the imaging point deviation of off-axis rays at different heights is controlled within ±0.014 mm. Figure 40B and Figure 40CIn the two field curvature aberration diagrams, the focal length variation of the three representative wavelengths falls within ±0.10 mm across the entire field of view. Figure 40D The distortion aberration diagram shows that the distortion aberration of this second embodiment is maintained within the range of ±12%.

[0223] As can be seen from the above description, the longitudinal spherical aberration, field curvature aberration, and distortion aberration of the ninth embodiment are superior to those of the first embodiment. Furthermore, the ninth embodiment also has a larger image height.

[0224] In summary, the optical lens group 10 of the embodiments of the present invention can achieve at least the following effects and advantages:

[0225] 1. The optical lens group 10 satisfies EDmax / EDmin ≦ 2.100, which helps to effectively converge the principal ray and edge rays from the incident light side A2, allowing the principal ray and edge rays to be projected onto the exit light side A1 at a high proportion, thus improving the projection effect. EDmax is the maximum effective diameter among the first lens 1 to the sixth lens 6, and EDmin is the minimum effective diameter among the first lens 1 to the sixth lens 6. The effective diameter of a lens generally refers to the two optical boundaries OB on opposite sides of the optical axis I (e.g., refer to...). Figures 3 to 6 The distance in the radial direction. In the first to ninth embodiments, EDmin is, for example, twice the distance D1, and EDmax is, for example, twice the distance D2. When the fifth lens 5 has a positive refractive index, a region 621 of the optical axis of the incident surface 62 of the sixth lens 6 is concave, a circumferential region 623 of the incident surface 62 of the sixth lens 6 is convex, and a circumferential region 613 of the emitting surface 61 of the sixth lens 6 is concave, it can converge (or focus) light rays at different angles, correct the aberration of the central field of view of the imaging plane, add the surface shape of the specific lens circumferential region, and satisfy the condition 3.000≦(D21t32+G56) / D11t21, which is beneficial to provide an optical lens group 10 with a smaller system length and better quality for the projection lens. The preferred limitation is 3.000≦(D21t32+G56) / D11t21≦5.700.

[0226] 2. Continuing from point 1, when the second lens 2 is further satisfied with having a positive refractive index, the assembly yield and imaging quality can be improved.

[0227] 3. The optical lens group 10 satisfies EDmax / EDmin≦2.100, which helps to effectively converge the principal ray and edge ray from the light-incident side A2, so that the principal ray and edge ray can be projected onto the light-outceasing side A1 at a high proportion, thus improving the projection effect. When the fifth lens 5 has a positive refractive index, the optical axis region 211 of the light-emitting surface 21 of the second lens 2 is convex, the optical axis region 621 of the light-incident surface 62 of the sixth lens 6 is concave, and the circumferential region 613 of the light-emitting surface 61 of the sixth lens 6 is concave, it can converge (or focus) light rays at different angles, correct the aberration of the central field of view of the imaging plane, add the surface shape of the specific lens circumferential region, and satisfy the condition 4.100≦(D21t32+G56)*Fno / (D11t21+G34), it is beneficial to provide an optical lens group 10 with a smaller system length and better quality for the projection lens. The preferred limitation is 4.100≦(D21t32+G56)*Fno / (D11t21+G34)≦8.000.

[0228] 4. Continuing from point 3, when the second lens 2 is further satisfied with having a positive refractive index, the assembly yield and imaging quality can be improved.

[0229] 5. The optical lens group 10 satisfies EDmax / EDmin≦2.100, which helps to effectively converge the principal ray and edge ray from the light-incident side A2, so that the principal ray and edge ray can be projected onto the light-outceasing side A1 at a high proportion, thus improving the projection effect. When the fifth lens 5 has a positive refractive index, a circular region 513 of the light-emitting surface 51 of the fifth lens 5 is concave, and a axial region 621 of the light-incident surface 62 of the sixth lens 6 is concave and a circular region 613 of the light-emitting surface 61 of the sixth lens 6 is concave, it can converge (or focus) light rays at different angles, correct the aberration of the central field of view of the imaging plane, add the surface shape of the specific lens circular region, and satisfy the condition 4.100≦(D21t32+G56)*Fno / (D11t21+G34), it is beneficial to provide an optical lens group 10 with a smaller system length and better quality for the projection lens. The preferred limitation is 4.100≦(D21t32+G56)*Fno / (D11t21+G34)≦8.000.

[0230] 6. Continuing from 5, when the second lens 2 is further satisfied with having a positive refractive index, the assembly yield and imaging quality can be improved.

[0231] 7. When the lens material meets the following configuration relationship, it is beneficial to the transmission and refraction of imaging light, and at the same time effectively improves chromatic aberration, so that the optical lens group 10 has excellent optical quality.

[0232]

[0233] 8. The optical lens group 10 of the present invention further satisfies the following condition, which helps to maintain the effective focal length and various optical parameters at an appropriate value, avoids any parameter being too large and thus not conducive to the correction of the overall aberration of the optical lens group 10, or avoids any parameter being too small and thus affecting assembly or increasing the difficulty of manufacturing.

[0234]

[0235] 9. The optical lens group 10 of the present invention further satisfies the following condition, which helps to maintain the thickness and spacing of each lens at an appropriate value, avoiding any parameter being too large and thus hindering the overall thinning of the optical lens group 10, or avoiding any parameter being too small and thus affecting assembly or increasing manufacturing difficulty.

[0236]

[0237] In addition, any combination of parameters in the alternative embodiments can be selected to increase the limitation of the optical lens group, so as to facilitate the design of optical lens groups with the same architecture as the present invention.

[0238] In view of the unpredictability of optical system design, under the framework of the present invention, meeting the above-mentioned conditions can better reduce the system length, increase the usable aperture, improve the optical quality, or improve the assembly yield, thereby improving the shortcomings of the prior art.

[0239] The exemplary limiting relationships listed above can be selectively combined and applied in varying numbers to embodiments of the present invention, and are not limited thereto. In implementing the present invention, in addition to the aforementioned relationships, further detailed structures such as concave and convex surface arrangements of lenses can be designed for a single lens or, more broadly, for multiple lenses, to enhance control over system performance and / or resolution. It should be noted that these details should be selectively combined and applied to other embodiments of the present invention, provided there is no conflict.

[0240] The numerical ranges, including the maximum and minimum values, obtained from the combined proportional relationships of the optical parameters disclosed in the various embodiments of the present invention can all be implemented accordingly.

[0241] The embodiments of this invention disclose optical parameters including, but not limited to, focal length, lens thickness, and Abbe number (Vd). For example, the present invention discloses an optical parameter A and an optical parameter B in various embodiments. The specific explanations of the ranges covered by these optical parameters, the comparative relationships between the optical parameters, and the conditional ranges covered by the multiple embodiments are as follows:

[0242] (1) The range covered by the optical parameters, for example: α2≦A≦α1 or β2≦B≦β1, where α1 is the maximum value of optical parameter A in multiple embodiments, α2 is the minimum value of optical parameter A in multiple embodiments, β1 is the maximum value of optical parameter B in multiple embodiments, and β2 is the minimum value of optical parameter B in multiple embodiments.

[0243] (2) Comparison of optical parameters, for example: A is greater than B or A is less than B.

[0244] (3) The range of conditional expressions covered by multiple embodiments, specifically, refers to the combination or proportional relationship obtained by possible calculations of a plurality of optical parameters of the same embodiment, and these relationships are defined as E. E can be, for example: A+B or AB or A / B or A*B or (A*B)1 / 2, and E satisfies the condition E≦γ1 or E≧γ2 or γ2≦E≦γ1, where γ1 and γ2 are the values ​​obtained by calculations of optical parameter A and optical parameter B of the same embodiment, and γ1 is the maximum value in multiple embodiments of the present invention, and γ2 is the minimum value in multiple embodiments of the present invention.

[0245] The range covered by the aforementioned optical parameters, the comparative relationships between the optical parameters, and the maximum, minimum, and numerical ranges within these conditions are all features upon which the present invention can be implemented, and all fall within the scope disclosed in the present invention. The above are merely illustrative examples and should not be construed as limiting.

[0246] All embodiments of the present invention are feasible, and some feature combinations can be extracted from the same embodiment. Compared with the prior art, these feature combinations can achieve unexpected effects. These feature combinations include, but are not limited to, combinations of features such as surface shape, refractive index, and conditional features. The disclosure of the embodiments of the present invention is a specific example to illustrate the principles of the present invention and should not be limited to the disclosed embodiments. Furthermore, the embodiments and their accompanying drawings are only for illustrative purposes and are not limited thereto.

Claims

1. An optical lens assembly, suitable for a projection lens, wherein multiple beams of light emitted from a multi-source generating unit are generated by the optical lens assembly, the direction toward the multi-source generating unit is an incident light side, and the opposite side is an exit light side, characterized in that: The optical lens set sequentially includes, along an optical axis from the light-out side to the light-in side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, and the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens each include a light-out surface facing the light-out side and a light-in surface facing the light-in side; wherein, the second lens has positive refractive power, the fifth lens has positive refractive power, an optical axis region of the light-in surface of the sixth lens is concave and a circumferential region of the light-in surface of the sixth lens is convex, a circumferential region of the light-out surface of the sixth lens is concave, and lenses of the optical lens set are only the first lens to the sixth lens described above, and satisfy the following conditional expressions: EDmax / EDmin≦2.100 and 3.000≦(D21t32+G56) / D11t21≦5.700, where EDmax is a maximum value of effective diameters in the first lens to the sixth lens, EDmin is a minimum value of the effective diameters in the first lens to the sixth lens, D21t32 is a distance from the light-out surface of the second lens to the light-in surface of the third lens, G56 is an air gap of the fifth lens and the sixth lens on the optical axis, and D11t21 is a distance from the light-out surface of the first lens to the light-out surface of the second lens; and also satisfy the following conditional expression: 6.100≦TTL / (G45+T5)≦14.700, where TTL is a distance from the light-out surface of the first lens to a light-emitting surface of the multi-light-source generating unit on the optical axis, G45 is an air gap of the fourth lens and the fifth lens on the optical axis, and T5 is a thickness of the fifth lens on the optical axis.

2. An optical lens group, adapted for a projection lens, for generating a plurality of light beams from a plurality of lights emitted by a multi-light source generating unit, a direction toward the multi-light source generating unit being an entrance light side, and an opposite side being an exit light side, characterized in that: The optical lens set sequentially includes, along an optical axis from the light-out side to the light-in side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, and the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens each include a light-out surface facing the light-out side and a light-in surface facing the light-in side; wherein, the second lens has positive refractive power, the fifth lens has positive refractive power, an optical axis region of the light-out surface of the second lens is convex; an optical axis region of the light-in surface of the sixth lens is concave, a circumferential region of the light-out surface of the sixth lens is concave, and The optical lens assembly includes only the first lens to the sixth lens, and satisfies the following conditional expressions: EDmax / EDmin≦2.100 and 4.100≦(D21t32+G56)*Fno / (D11t21+G34)≦8.000, where EDmax is the maximum value of effective diameters of the first lens to the sixth lens, EDmin is the minimum value of the effective diameters of the first lens to the sixth lens, D21t32 is the distance from the light exit surface of the second lens to the light entrance surface of the third lens, G56 is the air gap of the fifth lens and the sixth lens on the optical axis, Fno is the F-number, D11t21 is the distance from the light exit surface of the first lens to the light exit surface of the second lens, and G34 is the air gap of the third lens and the fourth lens on the optical axis; and further satisfies the following conditional expression: 6.100≦TTL / (G45+T5)≦14.700, where TTL is the distance from the light exit surface of the first lens to the light emitting surface of the multi-light source generating unit on the optical axis, G45 is the air gap of the fourth lens and the fifth lens on the optical axis, and T5 is the thickness of the fifth lens on the optical axis.

3. An optical lens group, adapted to a projection lens, for generating a plurality of light beams from a plurality of lights emitted by a multi-light source generating unit, a direction of the multi-light source generating unit is an entrance light side, and an opposite side is an exit light side, characterized in that: The optical lens assembly includes only the first lens to the sixth lens, and satisfies the following conditional expressions: EDmax / EDmin≦2.100 and 4.100≦(D21t32+G56)*Fno / (D11t21+G34)≦8.000, where EDmax is the maximum value of effective diameters of the first lens to the sixth lens, EDmin is the minimum value of the effective diameters of the first lens to the sixth lens, D21t32 is the distance from the light exit surface of the second lens to the light entrance surface of the third lens, G56 is the air gap of the fifth lens and the sixth lens on the optical axis, Fno is the F-number, D11t21 is the distance from the light exit surface of the first lens to the light exit surface of the second lens, and G34 is the air gap of the third lens and the fourth lens on the optical axis; and further satisfies the following conditional expression: 6.100≦TTL / (G45+T5)≦14.700, where TTL is the distance from the light exit surface of the first lens to the light emitting surface of the multi-light source generating unit on the optical axis, G45 is the air gap of the fourth lens and the fifth lens on the optical axis, and T5 is the thickness of the fifth lens on the optical axis. The second lens has a positive refractive power, The fifth lens has a positive refractive power, A circumferential region of the light exit surface of the fifth lens is concave; An optical axis region of the light entrance surface of the sixth lens is concave, A circumferential region of the light exit surface of the sixth lens is concave, and The optical lens set further satisfies the following conditional expression: 12.500≦TTL / (G12+G34)≦29.400, where TTL is the distance on the optical axis from the light exit surface of the first lens to a light emitting surface of the multi-light source generating unit, and G12 is the air gap on the optical axis between the first lens and the second lens.

4. The optical lens according to claim 2 or 3, wherein: The optical lens set further satisfies the following conditional expression: 12.500≦TTL / (G12+G34)≦29.400, where TTL is the distance on the optical axis from the light exit surface of the first lens to a light emitting surface of the multi-light source generating unit, and G12 is the air gap on the optical axis between the first lens and the second lens.

5. The optical lens according to claim 2 or 3, wherein: The optical lens set further satisfies the following conditional expression: 9.200≦(EFL+T2+T3+T5+G56+T6) / (G34+G45)≦77.300, where EFL is the effective focal length of the optical lens set, T2 is the thickness on the optical axis of the second lens, T3 is the thickness on the optical axis of the third lens, T5 is the thickness on the optical axis of the fifth lens, T6 is the thickness on the optical axis of the sixth lens, and G45 is the air gap on the optical axis between the fourth lens and the fifth lens.

6. The optical lens according to claim 2 or 3, wherein: The optical lens set further satisfies the following conditional expression: 13.800≦ALT / G34≦77.100, where ALT is the sum of the six thicknesses on the optical axis of the first lens to the sixth lens.

7. The optical lens according to claim 2 or 3, wherein: The optical lens set further satisfies the following conditional expression: 6.500≦TL / (G34+G45)≦50.000, where TL is the distance on the optical axis from the light exit surface of the first lens to the light entrance surface of the sixth lens, and G45 is the air gap on the optical axis between the fourth lens and the fifth lens.

8. The optical lens according to claim 1 or 2 or 3, wherein: The optical lens set further satisfies the following conditional expression: 3.700≦(V2+V3) / V4≦5.200, where V2 is the Vd Abbe number of the second lens, V3 is the Vd Abbe number of the third lens, and V4 is the Vd Abbe number of the fourth lens.

9. The optical lens set of claim 1 or 2 or 3, wherein: The optical lens assembly further satisfies the following conditional expression: 2.900 ≦ (V2+V3+V5) / (V1+V4) ≦ 4.100, where V1 is the Vd Abbe number of the first lens, V2 is the Vd Abbe number of the second lens, V3 is the Vd Abbe number of the third lens, V4 is the Vd Abbe number of the fourth lens, and V5 is the Vd Abbe number of the fifth lens.

10. The optical lens set of claim 1 or 2 or 3, wherein: The optical lens assembly further satisfies the following conditional expression: 4.000 ≦ TTL / BFL ≦ 7.800, where TTL is the distance from the light exit surface of the first lens to a light emitting surface of the multi-light source generating unit on the optical axis, and BFL is the distance from the light entrance surface of the sixth lens to the light emitting surface on the optical axis.

11. The optical lens set of claim 1 or 2 or 3, wherein: The optical lens assembly further satisfies the following conditional expression: 1.600 ≦ (T2+T3+T4+T5) / BFL ≦ 3.500, where T2 is the thickness of the second lens on the optical axis, T3 is the thickness of the third lens on the optical axis, T4 is the thickness of the fourth lens on the optical axis, T5 is the thickness of the fifth lens on the optical axis, and BFL is the distance from the light entrance surface of the sixth lens to a light emitting surface of the multi-light source generating unit on the optical axis.

12. The optical lens according to claim 1 or 2 or 3, wherein: The optical lens assembly further satisfies the following conditional expression: 3.000 ≦ EFL / BFL ≦ 5.400, where EFL is the effective focal length of the optical lens assembly, and BFL is the distance from the light entrance surface of the sixth lens to a light emitting surface of the multi-light source generating unit on the optical axis.

13. The optical lens set of claim 1 or 2 or 3, wherein: The optical lens assembly further satisfies the following conditional expression: 2.400 ≦ (V2+V4) / V1 ≦ 3.700, where V1 is the Vd Abbe number of the first lens, V2 is the Vd Abbe number of the second lens, and V4 is the Vd Abbe number of the fourth lens.

14. The optical lens set of claim 1 or 2 or 3, wherein: The optical lens assembly further satisfies the following conditional expression: 43.900 degrees ≦ HFOV*TTL / EFL ≦ 53.900 degrees, where HFOV is the half field of view of the optical lens assembly, TTL is the distance from the light exit surface of the first lens to a light emitting surface of the multi-light source generating unit on the optical axis, and EFL is the effective focal length of the optical lens assembly.

15. The optical lens set of claim 1 or 2 or 3, wherein: The optical lens assembly further satisfies the following conditional expression: 5.100 ≦ ALT / T1 ≦ 8.500, where ALT is the sum of the six thicknesses of the first lens to the sixth lens on the optical axis, and T1 is the thickness of the first lens on the optical axis.

16. The optical lens set of claim 1 or 2 or 3, wherein: The optical lens assembly further satisfies the following conditional expression: 5.700 ≦ (T2+T3+G56) / G12 ≦ 19.200, where T2 is the thickness of the second lens on the optical axis, T3 is the thickness of the third lens on the optical axis, and G12 is the air gap of the first lens and the second lens on the optical axis.

17. The optical lens set of claim 1 or 2 or 3, wherein: The optical lens assembly further satisfies the following conditional expression: 2.300 ≦ (T2+T3+G56) / (T4+G45) ≦ 7.300, where T2 is the thickness of the second lens on the optical axis, T3 is the thickness of the third lens on the optical axis, T4 is the thickness of the fourth lens on the optical axis, and G45 is the air gap of the fourth lens and the fifth lens on the optical axis.

18. The optical lens set of claim 1 or 2 or 3, wherein: The optical lens further satisfies the following conditional expression: 3.600≦(T2+T3) / G12≦13.200, wherein T2 is the thickness of the second lens on the optical axis, T3 is the thickness of the third lens on the optical axis, and G12 is the air gap of the first lens and the second lens on the optical axis.

Images