Optical lens assembly

Abstract

An optical lens assembly is adapted to a projection lens. The optical lens assembly is used to generate multiple light beams from multiple lights emitted by a multiple light source generating unit. A direction toward the multiple light source generating unit is a light input side, and an opposite side is a light output side. The optical lens assembly includes a first to a sixth lens elements in sequence along an optical axis from the light output side to the light input side, and each of the first to the sixth lens elements includes a light output surface facing the light output side and a light input surface facing the light input side. The first lens element has negative refractive power, the fourth lens element has negative refractive power, a periphery region of​the light output surface of the fifth lens element is a concave surface, and a periphery region of ​​the light input surface of the sixth lens element is a convex surface. A lens elements of the optical lens assembly only have the above six lens elements, and the projection lens and the optical lens assembly respectively satisfy a conditional expression as follows: EDmax / EDmin≦2.100；V1+V2+V3≦140.

Description

Technical Field

[0001] This invention relates to an electronic device, and more particularly to an optical lens assembly. Prior Technology

[0002] The specifications of portable electronic devices are constantly evolving, and key components such as optical lens assemblies are also becoming more diversified. The popularization of virtual reality (VR) and augmented reality (AR) is also driving the accelerated development of near-eye displays and peripheral devices. Therefore, in addition to being used for photography and video recording, optical lens assemblies can also be designed to utilize the principle of optical reflection to project image light or sensing light onto the lenses of a near-eye display or onto the eye, and then, through reflection, project the image or sensing light into the user's eyes or sensors to achieve augmented reality or eye-tracking effects.

[0003] However, in order to achieve the best ratio of light gathering and projection imaging in the projection lens, the optical lens group also needs to be continuously improved in design to enhance the optical imaging quality. How to achieve the above conditions has become a major challenge for relevant manufacturers. Summary of the Invention

[0004] This invention provides an optical lens assembly suitable for use in projection lenses, thereby improving projection performance.

[0005] An embodiment of the present invention provides an optical lens assembly suitable for use in a projection lens. The optical lens assembly is used to generate multiple light beams from multiple light sources emitted by a multi-source generating unit. The direction towards the multi-source generating unit is the incident light side, and the opposite side is the emitting light side. The optical lens assembly includes, sequentially along the optical axis from the emitting 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, and each of the first to sixth lenses includes an emitting surface facing the emitting light side and an incident light surface facing the incident light side. The first lens has a negative refractive index, the fourth lens has a negative refractive index, the circumferential region of the emitting light surface of the fifth lens is concave, and the circumferential region of the incident light surface of the sixth lens is convex. The optical lens group has only the six lenses mentioned above, and the projection lens and the optical lens group satisfy the following conditions respectively: EDmax / EDmin≦2.100; V1+V2+V3≦140, where EDmax is the maximum effective diameter among the six lenses, EDmin is the minimum effective diameter among the six lenses, V1 is the Vd Abbe number of the first lens, V2 is the Vd Abbe number of the second lens, and V3 is the Vd Abbe number of the third lens.

[0006] An embodiment of the present invention provides an optical lens assembly suitable for use in a projection lens. The optical lens assembly is used to generate multiple light beams from multiple light sources emitted by a multi-source generating unit. The direction towards the multi-source generating unit is the incident light side, and the opposite side is the emitting light side. The optical lens assembly includes, sequentially along the optical axis from the emitting 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, and each of the first to sixth lenses includes an emitting surface facing the emitting light side and an incident light surface facing the incident light side. The first lens has a negative refractive index, and the optical axis region of the emitting surface of the first lens is convex. The fourth lens has a negative refractive index. The circumferential region of the emitting surface of the fifth lens is concave, and the optical axis region of the incident surface of the sixth lens is concave. The optical lens group has only the six lenses mentioned above, and the projection lens and the optical lens group satisfy the following conditions respectively: EDmax / EDmin≦2.100; V1+ V3≦100, where EDmax is the maximum effective diameter among the six lenses, EDmin is the minimum effective diameter among the six lenses, V1 is the Vd Abbe number of the first lens, and V3 is the Vd Abbe number of the third lens.

[0007] An embodiment of the present invention provides an optical lens assembly suitable for use in a projection lens. The optical lens assembly is used to generate multiple light beams from multiple light sources emitted by a multi-source generating unit. The direction towards the multi-source generating unit is the incident light side, and the opposite side is the emitting light side. The optical lens assembly includes, sequentially along the optical axis from the emitting 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, and each of the first to sixth lenses includes an emitting surface facing the emitting light side and an incident light surface facing the incident light side. The first lens has a negative refractive index, and the optical axis region of the emitting surface of the first lens is convex. The circumferential region of the emitting surface of the second lens is convex, the fourth lens has a negative refractive index, and the optical axis region of the incident surface of the sixth lens is concave, and the circumferential region of the incident surface is convex. The optical lens group has only the six lenses mentioned above, and the projection lens and the optical lens group satisfy the following conditions respectively: EDmax / EDmin≦2.100; V1+ V3≦100, where EDmax is the maximum effective diameter among the six lenses, EDmin is the minimum effective diameter among the six lenses, V1 is the Vd Abbe number of the first lens, and V3 is the Vd Abbe number of the third lens.

[0008] Based on the above, the beneficial effects of the optical lens group in the embodiments of the present invention are as follows: by satisfying the conditional expression: EDmax / EDmin≦2.100 and the other conditions described above, as well as the arrangement design of the concave and convex surfaces of the lens and the condition of the refractive index, the optical lens group can effectively converge the main beam and edge beam emitted from the image light source from the incident light side, so that the beam can be projected onto the emitting light side at a high proportion, thereby improving the image effect of the projection lens. In addition, it can also correct the aberration of the central field of view of the imaging plane. Therefore, when the optical lens group is applied to the projection lens, it is beneficial to provide better chromatic aberration and better projection image 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 for detailed explanation. Simple Explanation of the Diagram

[0010] Figure 1A is a schematic diagram illustrating the application of the optical lens group of the present invention to a projection lens. Figure 1B is a front view of an embodiment of the multi-source generating unit in Figure 1A. Figure 2 is a schematic diagram illustrating the surface structure of a lens. Figure 3 is a schematic diagram illustrating the concave and convex structure of a lens and the focal point of light rays. Figure 4 is a schematic diagram illustrating the surface structure of a lens in Example 1. Figure 5 is a schematic diagram illustrating the surface structure of a lens in Example 2. Figure 6 is a schematic diagram illustrating the surface structure of a lens in Example 3. Figure 7 is a schematic diagram of the optical lens group of the first embodiment of the present invention. Figures 8A to 8D are diagrams of longitudinal spherical aberration and various aberrations of the optical lens group in the first embodiment. Figure 9 shows detailed optical data of the optical lens group of the first embodiment of the present invention. Figure 10 shows the aspherical parameters of the optical lens group of the first embodiment of the present invention. Figure 11 is a schematic diagram of the optical lens group of the second embodiment of the present invention. Figures 12A to 12D are diagrams of longitudinal spherical aberration and various aberrations of the optical lens group in the second embodiment. Figure 13 shows detailed optical data of the optical lens group of the second embodiment of the present invention. Figure 14 shows the aspherical parameters of the optical lens group of the second embodiment of the present invention. Figure 15 is a schematic diagram of the optical lens group of the third embodiment of the present invention. Figures 16A to 16D are diagrams of longitudinal spherical aberration and various aberrations of the optical lens group in the third embodiment. Figure 17 shows detailed optical data for the optical lens assembly of the third embodiment of the present invention. Figure 18 shows the aspherical parameters of the optical lens group of the third embodiment of the present invention. Figure 19 is a schematic diagram of the optical lens group of the fourth embodiment of the present invention. Figures 20A to 20D are diagrams of longitudinal spherical aberration and various aberrations of the optical lens group in the fourth embodiment. Figure 21 shows detailed optical data of the optical lens group of the fourth embodiment of the present invention. Figure 22 shows the aspherical parameters of the optical lens group according to the fourth embodiment of the present invention. Figure 23 is a schematic diagram of the optical lens group of the fifth embodiment of the present invention. Figures 24A to 24D are diagrams of longitudinal spherical aberration and various aberrations of the optical lens group in the fifth embodiment. Figure 25 shows detailed optical data for the optical lens group of the fifth embodiment of the present invention. Figure 26 shows the aspherical parameters of the optical lens group of the fifth embodiment of the present invention. Figure 27 is a schematic diagram of the optical lens group of the sixth embodiment of the present invention. Figures 28A to 28D are diagrams of longitudinal spherical aberration and various aberrations of the optical lens group in the sixth embodiment. Figure 29 shows detailed optical data for the optical lens assembly of the sixth embodiment of the present invention. Figure 30 shows the aspherical parameters of the optical lens group according to the sixth embodiment of the present invention. Figure 31 is a schematic diagram of the optical lens group of the seventh embodiment of the present invention. Figures 32A to 32D are diagrams of longitudinal spherical aberration and various aberrations of the optical lens group in the seventh embodiment. Figure 33 shows detailed optical data for the optical lens assembly of the seventh embodiment of the present invention. Figure 34 shows the aspherical parameters of the optical lens group of the seventh embodiment of the present invention. Figure 35 is a schematic diagram of the optical lens group of the eighth embodiment of the present invention. Figures 36A to 36D are diagrams of longitudinal spherical aberration and various aberrations of the optical lens group in the eighth embodiment. Figure 37 shows detailed optical data for the optical lens group of the eighth embodiment of the present invention. Figure 38 shows the aspherical parameters of the optical lens group of the eighth embodiment of the present invention. Figure 39 is a schematic diagram of the optical lens assembly of the ninth embodiment of the present invention. Figures 40A to 40D are diagrams of longitudinal spherical aberration and various aberrations of the optical lens group in the ninth embodiment. Figure 41 shows detailed optical data of the optical lens group of the ninth embodiment of the present invention. Figure 42 shows the aspherical parameters of the optical lens group of the ninth embodiment of the present invention. Figure 43 shows the numerical values ​​of the important parameters and their relationships of the optical lens groups in the first to third embodiments of the present invention. Figure 44 shows the numerical values ​​of the important parameters and their relationships of the optical lens group in the fourth to sixth embodiments of the present invention. Figure 45 shows the numerical values ​​of the important parameters and their relationships of the optical lens group in the seventh to ninth embodiments of the present invention. Implementation

[0011] Referring to Figure 1A, the light direction of the projection lens 20 is either display light or sensing light, emitted by the multi-source light generation unit 15. Multiple beams a, b, and c are generated via the optical lens group 10 of this embodiment of the invention. These beams can be used to detect the environment in front of the projection lens 20 or as image beams to generate an image. That is, beams a, b, and c are not limited to any particular form; their direction of travel is described here as dashed lines. The number of beams a, b, and c is not limited to three; it can be any number other than three or one. Figure 1A uses beams a, b, and c as examples. Referring to Figure 1B, in one embodiment, the multi-source light generation unit 15 includes multiple light sources 15a arranged in an array. In other embodiments, these light sources 15a can be arranged in a ring or other arrangements; this invention is not limited to these arrangements. The light sources 15a can be display light sources for projecting display light or infrared laser light sources for emitting sensing light. The emitting surfaces of these light sources 15a together form the emitting surface 100a of the multi-light source generating unit 15.

[0012] 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 light ray that passes through the optical lens group 10 from the light-emitting side to the light-emitting surface 100a of the multi-source generating unit 15 for focusing and imaging.

[0013] 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.

[0014] The optical lens assembly 10 of this specification includes at least one lens that receives light rays incident on the optical system from parallel to the optical axis to within a half-angle (HFOV) relative to the optical axis. The phrase "a lens has a positive (or 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 a specific range through which light rays pass on the lens surface. Light rays include at least two types: the chief ray (Lc) and the arginal ray (Lm), as shown in Figure 2. (The light-emitting or light-receiving surface of the lens may be divided into different regions depending on its location, including the optical axis region, the circumferential region, or one or more relay regions in some embodiments, which will be described in detail below.)

[0015] Figure 2 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 an intersection of the surface with the optical axis I. As illustrated in Figure 2, 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 not have transition points or may have 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 Figure 4), and the Nth transition point (farthest from the optical axis I).

[0016] When the lens surface has at least one transition point, the area from the center point to the first transition point TP1 is defined as the optical axis region, which includes the center point. The area 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.

[0017] 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.

[0018] In addition, referring to Figure 2, lens 100 may also include an assembly portion 130 extending radially outward from optical boundary OB. Assembly portion 130 is generally used for assembling lens 100 to a corresponding element (not shown) in an optical system. Light does not reach assembly portion 130. The structure and shape of assembly portion 130 are merely illustrative examples of the invention and are not intended to limit the scope of the invention. Assembly portion 130 of the lens discussed below may be partially or entirely omitted in the figures.

[0019] Referring to Figure 3, the region between the center point CP and the first transition point TP1 is defined as the optical axis region Z1. The region between the first transition point TP1 and the optical boundary OB of the lens surface is defined as the circumferential region Z2. As shown in Figure 3, after passing through the optical axis region Z1, the parallel ray 211 intersects the optical axis I on the light-incident side A2 of the lens 200. That is, the focal point of the parallel ray 211 passing through the optical axis region Z1 is located at the intersection point R on the light-incident side A2 of the lens 200. Since the ray intersects the optical axis I on the light-incident side A2 of the lens 200, the optical axis region Z1 is convex. Conversely, the parallel ray 212 diverges after passing through the circumferential region Z2. As shown in Figure 3, the extension line EL of the parallel ray 212 after passing through the circumferential region Z2 intersects the optical axis I on the light-outcident side A1 of the lens 200. That is, the focal point of the parallel ray 212 passing through the circumferential region Z2 is located at the intersection point M on the light-outcident side A1 of the lens 200. Since the extension line EL of the light ray intersects the optical axis I at the light-emitting side A1 of the lens 200, the circumferential region Z2 is concave. In the lens 200 shown in Figure 3, 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.

[0020] 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. This method yields results consistent with the aforementioned method using 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 to determine the convexity / concavity. 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.

[0021] Figures 4 to 6 provide examples of determining the surface shape and region boundaries of the lens region in various situations, including the aforementioned optical axis region, circumferential region, and relay region.

[0022] Figure 4 is a radial sectional view of lens 300. Referring to 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 the circumferential region Z2 of the incident surface 320 of lens 300 are shown in Figure 4. The R value of this incident surface 320 is positive (i.e., R>0), therefore, the optical axis region Z1 is concave.

[0023] Generally, the surface shape of each region bounded by the transition point will be opposite to that of the adjacent region. Therefore, the transition point can be used to define the change in surface shape, that is, from the transition point, the surface changes from concave to convex or from convex to concave. In Figure 4, since the optical axis region Z1 is concave, the surface shape changes at the transition point TP1, so the circumferential region Z2 is convex.

[0024] Figure 5 is a radial cross-sectional view of lens 400. Referring to 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.

[0025] 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 convex. In addition, 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 concave. Referring again to 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 between the first conversion point TP1 and the second conversion point TP2, and the circular 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 from the first conversion point TP1 to concave, the relay region Z3 is concave. Furthermore, its surface shape changes back to convex from the second conversion point TP2, so the circular region Z2 is convex.

[0026] Figure 6 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 optical axis region is defined as 0% to 50% of the distance from the optical axis I to the optical boundary OB of the lens surface, and the circumferential region is defined as 50% to 100% of the distance from the optical axis I to the optical boundary OB of the lens surface. Referring to lens 500 shown in Figure 6, the optical axis region Z1 of the light-emitting surface 510 is defined as 50% of the distance from the optical axis I to the optical boundary OB of the lens 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 lens 500 has no transition point, the circumferential region Z2 of the light-emitting surface 510 is also convex. Lens 500 may further have an assembly portion (not shown) extending radially outward from the circumferential region Z2.

[0027] Figure 7 is a schematic diagram of the optical lens group according to the first embodiment of the present invention, and Figures 8A to 8D are diagrams of longitudinal spherical aberration and various aberrations of the optical lens group according to the first embodiment. Referring first to Figure 7, in the optical lens group 10 of the first embodiment of the present invention, along an optical axis I of the optical lens group 10 from the light-emitting side to the light-incident side, it sequentially includes an aperture ST, 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 beams L1, L2, L3, L4, and L5 emitted from the light-emitting surface 100a of the multi-source generating unit 15 enter the optical lens group 10, and sequentially pass 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 ST, multiple light beams are generated and emitted from the optical lens group 10. It is worth mentioning 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. Furthermore, 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.

[0028] On the other hand, beams L1 and L2 are beams emitted from near the centroid (i.e., the shape center) of the luminous surface 100a, and can be defined as the central beams of the luminous surface 100a. Beams L3, L4, and L5 are beams emitted from the edges of the luminous surface 100a, and can therefore be defined as the edge beams of the luminous surface 100a.

[0029] 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 have a light-emitting surface 11, a light-emitting surface 21, a light-emitting surface 31, a light-emitting surface 41, a light-emitting surface 51, and a light-emitting surface 61 facing the light-emitting side A1 and allowing light beams L1 to L5 to pass through; and each has a light-incident surface 12, a light-incident surface 22, a light-incident surface 32, a light-incident surface 42, a light-incident surface 52, and a light-incident surface 62 facing the light-incident side A2 and allowing light beams L1 to L5 to pass through.

[0030] The first lens 1 is the sixth lens with refractive power, measured from the light-incident side A2 to the light-outcident side A1. The first lens 1 has a negative refractive power. The optical axis region 115 and the circumferential region 116 of the light-outcident surface 11 of the first lens 1 are both convex, and the optical axis region 125 and the circumferential region 126 of the light-incident surface 12 of the first lens 1 are both concave.

[0031] The second lens 2 is the fifth lens with refractive power, counting from the light-incident side A2 to the light-outcident side A1. The second lens 2 has positive refractive power. The optical axis region 215 and the circumferential region 216 of the light-outcident surface 21 of the second lens 2 are both convex, and the optical axis region 225 and the circumferential region 226 of the light-incident surface 22 of the second lens 2 are both concave.

[0032] The third lens 3 is the fourth lens with refractive power, measured from the incident light side A2 to the emitting light side A1. The third lens 3 has positive refractive power. The optical axis region 315 of the emitting light surface 31 of the third lens 3 is convex, and the circumferential region 316 of the emitting light surface 31 is concave. The optical axis region 325 and the circumferential region 326 of the incident light surface 32 of the third lens 3 are both convex.

[0033] The fourth lens 4 is the third lens with refractive power, measured from the incident light side A2 to the emitting light side A1. The fourth lens 4 has a negative refractive power. The optical axis region 415 and the circumferential region 416 of the emitting light surface 41 of the fourth lens 4 are both concave. The optical axis region 425 of the incident light surface 42 of the fourth lens 4 is concave, and the circumferential region 426 of the incident light surface 42 is convex.

[0034] The fifth lens 5 is the second lens with refractive index, measured from the incident light side A2 to the emitting light side A1. The fifth lens 5 has positive refractive index. The optical axis region 515 of the emitting light surface 51 of the fifth lens 5 is convex, and the circumferential region 516 of the emitting light surface 51 is concave. The optical axis region 525 of the incident light surface 52 of the fifth lens 5 is concave, and the circumferential region 526 of the incident light surface 52 is convex.

[0035] The sixth lens 6 is the first lens with refractive power, measured from the incident light side A2 to the emitting light side A1. The sixth lens 6 has a negative refractive power. The optical axis region 615 of the emitting surface 61 of the sixth lens 6 is convex, and the circumferential region 616 of the emitting surface 31 is concave. The optical axis region 625 of the incident surface 62 of the sixth lens 6 is concave, and the circumferential region 626 is convex.

[0036] On the other hand, in this embodiment and the embodiments described below, when the optical lens group 10 is applied to a projection lens, it can also satisfy the following condition: EDmax / EDmin ≦ 2.100. Here, EDmax is the maximum effective diameter among the first lens 1 to the sixth lens 6. For example, in Figure 7, in the direction perpendicular to the optical axis I of the optical lens group 10, the lens with the maximum effective diameter (i.e., the diameter of the surface shape in the lens that allows the light beam to pass through) is the diameter of the light-incident surface 62 of the sixth lens 6. Therefore, half of the maximum effective diameter, i.e., 0.5 * EDmax, is schematically drawn in Figure 7. Similarly, EDmin is the minimum effective diameter among the first lens 1 to the sixth lens 6. For example, in Figure 7, in the direction perpendicular to the optical axis I of the optical lens group 10, the lens with the minimum effective diameter is the diameter of the light-outceasing surface 11 of the first lens 1. Therefore, half of the minimum effective diameter, i.e., 0.5 * EDmin, is schematically drawn in Figure 7. Therefore, when the optical lens group 10 is applied to a projection lens, EDmax and EDmin can also represent the maximum and minimum effective diameters of the projection lens, respectively.

[0037] Other detailed optical data for the first embodiment are shown in Figure 9. The effective focal length (EFL) of the overall system of the optical lens group 10 in the first embodiment is 3.125 mm, the half field of view (HFOV) is 37.200°, the f-number (Fno) is 1.510, and the system length (TTL) is 4.617 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 "f-number" in this specification is calculated based on the principle of light reversibility, treating the aperture ST as the entrance pupil. The image height (ImgH) is 2.005.

[0038] Furthermore, 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 12 surfaces, are all aspherical surfaces. 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 aspherical surfaces. These aspherical surfaces are defined according to the following formula: -----------(1) in: Y: The distance between a point on the aspherical curve and the optical axis I; Z: Depth of the aspherical surface (the perpendicular distance between a point on the aspherical surface at a distance Y from the optical axis I and a tangent plane at the vertex on the optical axis I of the aspherical surface); R: Radius of curvature of the lens surface near the optical axis I; K: Conic constant; ai: the i-th order aspherical coefficient;

[0039] 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 in Figure 10. In Figure 10, column number 11 indicates that it is the aspherical coefficient of the light-emitting surface 11 of the first lens 1, and the other columns are deduced in the same way.

[0040] Furthermore, the relationship between the important parameters in the optical imaging lens 10 of the first embodiment is shown in Figure 43. in, T1 is the thickness of the first lens 1 on the optical axis I; T2 is the thickness of the second lens 2 on the optical axis I; T3 is the thickness of the third lens 3 on optical axis I; T4 is the thickness of the fourth lens 4 on the optical axis I; T5 is the thickness of the fifth lens 5 on optical axis I; T6 is the thickness of the sixth lens 6 on optical axis I; G12 The air gap between the first lens 1 and the second lens 2 on the optical axis I; G23 is the air gap between the second lens 2 and the third lens 3 on the optical axis I; G34 is the air gap between the third lens 3 and the fourth lens 4 on the optical axis I; G45 is the air gap between the fourth lens 4 and the fifth lens 5 on optical axis I; G56 is the air gap between the fifth lens 5 and the sixth lens 6 on optical axis I; AAG is the sum of the five air gaps on optical axis I for lenses 1 through 6, namely G12, G23, G34, G45, and G56; 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; 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; TTL is the distance along the optical axis I from the light-emitting surface 11 of the first lens 1 to the light-emitting surface 100a, which can also be understood as the system length; BFL is the distance on the optical axis I from the incident surface 62 to the emitting surface 100a of the sixth lens 6. LCR (Light circle radius) is the radius of the light-emitting circle (denoted as LCR, as shown in Figure 1B), which is the radius of the smallest circumscribed circle of the light-emitting surface 100a of the multi-light source generating unit 15, and also the image height of the optical lens group; HFOV is the half field of view (denoted as ω, as shown in Figure 1A), which is the maximum half exit angle of the optical lens group 10; Fno is the aperture value, which is calculated based on the principle of light reversibility to determine the effective aperture of the light beam emitted by the optical lens group 10. In the embodiment of this invention, the aperture ST is considered as the aperture value calculated from the entrance pupil. EFL is the effective focal length of optical lens group 10. Furthermore, redefine: 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; f1 is the focal length of the first lens 1; f2 is the focal length of the second lens 2; f3 is the focal length of the third lens 3; f4 is the focal length of the fourth lens 4; f5 is the focal length of the fifth lens 5; f6 is the focal length of the sixth lens 6; n1 is the nd refractive index of the first lens 1; n2 is the nd refractive index of the second lens 2; n3 is the nd refractive index of the third lens 3; n4 is the nd refractive index of the fourth lens 4; n5 is the nd refractive index of the fifth lens 5; n6 is the nd refractive index of the sixth lens 6; V1 is the Abbe number of the first lens 1, Vd; V2 is the Abbe number of the second lens 2, Vd; V3 is the Abbe number of the third lens 3, Vd; V4 is the Abbe number of the fourth lens 4 (Vd). V5 is the Abbe number of the fifth lens 5; and V6 is the Abbe number of the sixth lens 6, Vd.

[0041] It is worth noting that the lens material parameters disclosed in the optical parameter table of this specification are in the international glass code format using the nd refractive index and Vd Abbe number, so that those skilled in the art can understand the specific material implementation. Here, nd is the refractive index of the material at the d-helium yellow line of 587.56 nanometers (nm), and Vd is calculated using the refractive index of the material at the d, F, and C wavelengths of the Fraunhofer spectrum. The focal length values ​​disclosed in the optical parameter table of the embodiments are calculated based on the refractive index of the wavelength band in which the optical system is implemented. Since the primary wavelength of the embodiments of this invention is 525 nm, the focal length values ​​of this invention are calculated based on the refractive index of the material at 525 nm.

[0042] Referring in conjunction with Figures 8A to 8D, Figure 8A illustrates the Longitudinal Spherical Aberration of the First Embodiment, while Figures 8B and 8C illustrate the Field Curvature aberration in the Sagittal direction and the Field Curvature aberration in the Tangential direction of the First Embodiment on the projection plane when the wavelengths are 507 nm, 525 nm, and 543 nm, respectively. Figure 8D illustrates the Distortion Aberration of the First Embodiment on the projection plane when the wavelengths are 507 nm, 525 nm, and 543 nm.

[0043] As shown in Figure 8A, the longitudinal spherical aberration of this first embodiment is very close to each other and moves towards the center, indicating that off-axis rays of different heights for each wavelength are concentrated near the imaging point. The skewing of the curves for each wavelength shows that the imaging point deviation of off-axis rays of different heights is controlled within ±0.02 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 rays of different wavelengths are quite concentrated, thus significantly improving chromatic aberration.

[0044] In the two field curvature aberration diagrams in Figures 8B and 8C, the focal length variation of the three representative wavelengths across the entire field of view falls within ±0.04 mm, indicating that the optical lens group 10 of this first embodiment can effectively eliminate aberrations. The distortion aberration diagram in Figure 8D shows that the distortion aberration of this first embodiment is maintained within ±16%, indicating that the distortion aberration of this first embodiment meets the projection quality requirements of the optical lens group 10. Therefore, this first embodiment, compared to existing optical lens groups, can still provide good imaging quality even with a system length shortened to approximately 4.617 mm. Thus, this first embodiment can shorten the projection lens length and provide good projection image quality while maintaining good optical performance.

[0045] Figure 11 is a schematic diagram of the optical lens group according to the second embodiment of the present invention, while Figures 12A to 12D are diagrams of longitudinal spherical aberration and various aberrations of the optical lens group of the second embodiment. Referring first to 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 the first lens 1, second lens 2, third lens 3, fourth lens 4, fifth lens 5, and sixth lens 6 are more or less different. Furthermore, in this embodiment, the circumferential region 126 of the light-incident surface 12 of the first lens 1 is convex; the circumferential region 316 of the light-excising surface 31 of the third lens 3 is convex; and the circumferential region 426 of the light-incident surface 42 of the fourth lens 4 is concave. It should be noted that, for clearer visual representation, the labels of some optical axis regions and circumferential regions with surface shapes similar to those of the first embodiment are omitted in Figure 11.

[0046] The detailed optical data of the optical imaging lens 10 of the second embodiment is shown in Figure 13. The effective focal length of the optical imaging lens 10 of the second embodiment is 3.793 mm, the half field of view (HFOV) is 37.200°, the aperture value (Fno) is 1.832, the system length (TTL) is 4.723 mm, and the image height (ImgH) is 2.966 mm.

[0047] As shown in 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 represented in formula (1).

[0048] Furthermore, the relationship between the important parameters in the optical imaging lens 10 of the second embodiment is shown in Figure 43.

[0049] As shown in Figure 12A, the longitudinal spherical aberration of this second embodiment controls the imaging point deviation of off-axis rays at different heights within ±0.03 mm. In the field curvature aberration diagrams of Figures 12B and 12C, the focal length variation of the three representative wavelengths across the entire field of view falls within ±0.2 mm. The distortion aberration diagram in Figure 12D shows that the distortion aberration of this second embodiment is maintained within ±5%.

[0050] As can be seen from the above description, the distortion of the second embodiment is better than that of the first embodiment. Furthermore, the second embodiment also has a larger image height.

[0051] Figure 15 is a schematic diagram of the optical lens group according to the third embodiment of the present invention, while Figures 16A to 16D are diagrams of the longitudinal spherical aberration and various aberrations of the optical lens group of the third embodiment. Referring first to 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 the first lens 1, second lens 2, third lens 3, fourth lens 4, fifth lens 5, and sixth lens 6 are more or less different. Furthermore, in this embodiment, the circumferential region 426 of the incident surface 42 of the fourth lens 4 is concave. It should be noted that, for clearer visualization, the labels of the optical axis region and circumferential region, which have similar surface shapes to those in the first embodiment, are omitted in Figure 15.

[0052] The detailed optical data of the optical imaging lens 10 of the third embodiment is shown in Figure 17. The effective focal length of the optical imaging lens 10 of the third embodiment is 3.197 mm, the half field of view (HFOV) is 37.200°, the aperture value (Fno) is 1.544, the system length (TTL) is 4.327 mm, and the image height (ImgH) is 2.174 mm.

[0053] As shown in 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 represented in formula (1).

[0054] Furthermore, the relationship between the important parameters in the optical imaging lens 10 of the third embodiment is shown in Figure 43.

[0055] As shown in Figure 16A, the longitudinal spherical aberration of this third embodiment controls the imaging point deviation of off-axis rays at different heights within ±0.016 mm. In the field curvature aberration diagrams of Figures 16B and 16C, the focal length variation of the three representative wavelengths across the entire field of view falls within ±0.07 mm. The distortion aberration diagram in Figure 16D shows that the distortion aberration of this third embodiment is maintained within ±12%.

[0056] As can be seen from the above description, the system length of the third embodiment is shorter than that of the first embodiment, the longitudinal spherical aberration and distortion of the third embodiment are better than those of the first embodiment, and the third embodiment also has a larger image height.

[0057] Figure 19 is a schematic diagram of the optical lens group according to the fourth embodiment of the present invention, while Figures 20A to 20D are diagrams of the longitudinal spherical aberration and various aberrations of the optical lens group of the fourth embodiment. Referring first to Figure 19, a fourth 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 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 are more or less different. In addition, in this embodiment, the circumferential region 426 of the incident surface 42 of the fourth lens 4 is concave. It should be noted that, in order to clearly show the figures, the labels of the optical axis region and the circumferential region that are similar in shape to those of the first embodiment are omitted in Figure 19.

[0058] The detailed optical data of the optical imaging lens 10 of the fourth embodiment is shown in Figure 21. The effective focal length of the optical imaging lens 10 of the fourth embodiment is 3.203 mm, the half field of view (HFOV) is 37.200°, the aperture value (Fno) is 1.547, the system length (TTL) is 4.316 mm, and the image height (ImgH) is 2.210 mm.

[0059] As shown in 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 represented in formula (1).

[0060] Furthermore, the relationship between the important parameters in the optical imaging lens 10 of the fourth embodiment is shown in Figure 44.

[0061] As shown in Figure 20A, the longitudinal spherical aberration of this fourth embodiment controls the imaging point deviation of off-axis rays at different heights within ±0.016 mm. In the field curvature aberration diagrams in Figures 20B and 20C, the focal length variation of the three representative wavelengths across the entire field of view falls within ±0.06 mm. The distortion aberration diagram in Figure 20D shows that the distortion aberration of this fourth embodiment is maintained within ±10%.

[0062] As can be seen from the above description, the system length of the fourth embodiment is shorter than that of the first embodiment, and the longitudinal spherical aberration and distortion of the fourth embodiment are better than those of the first embodiment. Furthermore, the fourth embodiment also has a larger image height.

[0063] Figure 23 is a schematic diagram of the optical lens group according to the fifth embodiment of the present invention, while Figures 24A to 24D are diagrams of longitudinal spherical aberration and various aberrations of the optical lens group of the fifth embodiment. Referring first to Figure 23, a fifth 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 the first lens 1, second lens 2, third lens 3, fourth lens 4, fifth lens 5, and sixth lens 6 are more or less different. Furthermore, in this embodiment, the circumferential region 226 of the light-incident surface 22 of the second lens 2 is convex. The circumferential region 316 of the light-excising surface 31 of the third lens 3 is convex. The circumferential region 426 of the light-incident surface 42 of the fourth lens 4 is concave. It should be noted that, for clearer visual representation, the labels of some optical axis regions and circumferential regions with surface shapes similar to those in the first embodiment are omitted in Figure 23.

[0064] The detailed optical data of the optical imaging lens 10 of the fifth embodiment is shown in Figure 25. The effective focal length of the optical imaging lens 10 of the fifth embodiment is 3.198 mm, the half field of view (HFOV) is 37.200°, the aperture value (Fno) is 1.545, the system length (TTL) is 4.504 mm, and the image height (ImgH) is 2.128 mm.

[0065] As shown in 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 represented in formula (1).

[0066] Furthermore, the relationship between the important parameters in the optical imaging lens 10 of the fifth embodiment is shown in Figure 44.

[0067] As shown in Figure 24A, the longitudinal spherical aberration of this fifth embodiment controls the imaging point deviation of off-axis rays at different heights within ±0.008 mm. In the field curvature aberration diagrams of Figures 24B and 24C, the focal length variation of the three representative wavelengths across the entire field of view falls within ±0.04 mm. The distortion aberration diagram in Figure 24D shows that the distortion aberration of this fifth embodiment is maintained within ±16%.

[0068] As can be seen from the above description, the system length of the fifth embodiment is shorter than that of the first embodiment, and the longitudinal spherical aberration and distortion of the fifth embodiment are both superior to those of the first embodiment. Furthermore, the fifth embodiment also has a larger image height.

[0069] Figure 27 is a schematic diagram of the optical lens group according to the sixth embodiment of the present invention, and Figures 28A to 28D are diagrams of longitudinal spherical aberration and various aberrations of the optical lens group of the sixth embodiment. Referring first to Figure 27, a sixth 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 the first lens 1, second lens 2, third lens 3, fourth lens 4, fifth lens 5, and sixth lens 6 are more or less different. In addition, in this embodiment, the circumferential region 226 of the light-incident surface 22 of the second lens 2 is convex. The circumferential region 316 of the light-excising surface 31 of the third lens 3 is convex. The circumferential region 426 of the light-incident surface 42 of the fourth lens 4 is concave. It should be noted that, in order to clearly show the figures, the labels of the optical axis region and the circumferential region that are similar in shape to those of the first embodiment are omitted in Figure 27.

[0070] The detailed optical data of the optical imaging lens 10 of the sixth embodiment is shown in Figure 29. The effective focal length of the optical imaging lens 10 of the sixth embodiment is 3.300 mm, the half field of view (HFOV) is 37.200°, the aperture value (Fno) is 1.594, the system length (TTL) is 4.501 mm, and the image height (ImgH) is 2.279 mm.

[0071] As shown in 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 the sixth embodiment are represented in formula (1).

[0072] Furthermore, the relationship between the important parameters in the optical imaging lens 10 of the sixth embodiment is shown in Figure 44.

[0073] As shown in Figure 28A, the longitudinal spherical aberration of this sixth embodiment controls the imaging point deviation of off-axis rays at different heights within ±0.01 mm. In the field curvature aberration diagrams of Figures 28B and 28C, the focal length variation of the three representative wavelengths across the entire field of view falls within ±0.06 mm. The distortion aberration diagram in Figure 28D shows that the distortion aberration of this sixth embodiment is maintained within ±10%.

[0074] As can be seen from the above description, the system length of the sixth embodiment is shorter than that of the first embodiment, and the longitudinal spherical aberration and distortion of the sixth embodiment are both superior to those of the first embodiment. Furthermore, the sixth embodiment also has a larger image height.

[0075] Figure 31 is a schematic diagram of the optical lens group according to the seventh embodiment of the present invention, and Figures 32A to 32D are longitudinal spherical aberration and various aberration diagrams of the optical lens group of the seventh embodiment. Referring first to Figure 31, a seventh embodiment of the optical lens group 10 of the present invention is generally similar to the first embodiment, but the differences between the two are as follows: the optical data, aspherical coefficients, and parameters between 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 are more or less different. In addition, in this embodiment, the circumferential region 116 of the light-emitting surface 11 of the first lens 1 is concave. The optical axis region 225 and the circumferential region 226 of the light-incident surface 22 of the second lens 2 are both convex. The third lens 3 has a negative refractive index, and the optical axis region 315 of the light-emitting surface 31 of the third lens 3 is concave, and the optical axis region 325 of the light-incident surface 32 of the third lens 3 is concave. The optical axis region 415 of the light-emitting surface 41 of the fourth lens 4 is convex, and the circumferential region 426 of the light-incident surface 42 of the fourth lens 4 is concave. It should be noted that, for clarity, the labels for the optical axis region and circumferential region, which have similar surface shapes to those in the first embodiment, are omitted in Figure 31.

[0076] The detailed optical data of the optical imaging lens 10 of the seventh embodiment is shown in Figure 33. The effective focal length of the optical imaging lens 10 of the seventh embodiment is 3.131 mm, the half field of view (HFOV) is 37.200°, the aperture value (Fno) is 1.513, the system length (TTL) is 4.518 mm, and the image height (ImgH) is 2.119 mm.

[0077] As shown in 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 represented in formula (1).

[0078] Furthermore, the relationship between the important parameters in the optical imaging lens 10 of the seventh embodiment is shown in Figure 45.

[0079] As shown in Figure 32A, the longitudinal spherical aberration of this seventh embodiment controls the imaging point deviation of off-axis rays at different heights within ±0.014 mm. In the field curvature aberration diagrams of Figures 32B and 32C, the focal length variation of the three representative wavelengths across the entire field of view falls within ±0.10 mm. The distortion aberration diagram in Figure 32D shows that the distortion aberration of this seventh embodiment is maintained within ±12%.

[0080] As can be seen from the above description, the system length of the seventh embodiment is shorter than that of the first embodiment, and the longitudinal spherical aberration and distortion of the seventh embodiment are both superior to those of the first embodiment. Furthermore, the seventh embodiment also has a larger image height.

[0081] Figure 35 is a schematic diagram of the optical lens group of the eighth embodiment of the present invention, and Figures 36A to 36D are longitudinal spherical aberration and various aberration diagrams of the optical lens group of the eighth embodiment. Referring first to Figure 35, the eighth embodiment of the optical lens group 10 of the present invention is generally similar to the first embodiment, but the differences between the two are as follows: the optical data, aspherical coefficients, and parameters between 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 are more or less different. In addition, in this embodiment, the circumferential region 116 of the light-emitting surface 11 of the first lens 1 is concave, and the circumferential region 126 of the light-incident surface 12 is convex. The circumferential region 316 of the light-emitting surface 31 of the third lens 3 is convex. The circumferential region 416 of the light-emitting surface 41 of the fourth lens 4 is convex, and the optical axis region 425 of the light-incident surface 42 of the fourth lens 4 is convex, and the circumferential region 426 of the light-incident surface 42 is concave. The incident surface 52 of the fifth lens 5 has a concave circumferential region 526. It should be noted that, for clarity, the labels for the optical axis and circumferential regions with similar surface shapes to those in the first embodiment are omitted in Figure 35.

[0082] The detailed optical data of the optical imaging lens 10 of the eighth embodiment is shown in Figure 37. The effective focal length of the optical imaging lens 10 of the eighth embodiment is 3.426 mm, the half field of view (HFOV) is 37.200°, the aperture value (Fno) is 1.655, the system length (TTL) is 4.467 mm, and the image height (ImgH) is 2.720 mm.

[0083] As shown in 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 represented in formula (1).

[0084] Furthermore, the relationship between the important parameters in the optical imaging lens 10 of the eighth embodiment is shown in Figure 45.

[0085] As shown in Figure 36A, the longitudinal spherical aberration of this eighth embodiment controls the imaging point deviation of off-axis rays at different heights within ±0.02 mm. In the field curvature aberration diagrams of Figures 36B and 36C, the focal length variation of the three representative wavelengths across the entire field of view falls within ±0.10 mm. The distortion aberration diagram in Figure 36D shows that the distortion aberration of this eighth embodiment is maintained within ±7%.

[0086] As can be seen from the above description, the system length of the eighth embodiment is shorter than that of the first embodiment, and the distortion of the eighth embodiment is better than that of the first embodiment. Furthermore, the eighth embodiment also has a larger image height.

[0087] Figure 39 is a schematic diagram of the optical lens group according to the ninth embodiment of the present invention, and Figures 40A to 40D are diagrams of longitudinal spherical aberration and various aberrations of the optical lens group of the ninth embodiment. Referring first to Figure 39, a ninth 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 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 are more or less different. In addition, in this embodiment, the circumferential region 226 of the light-incident surface 22 of the second lens 2 is convex. The circumferential region 316 of the light-outceasing surface 31 of the third lens 3 is convex, and the circumferential region 326 of the light-incident surface 32 of the third lens 3 is concave. The circumferential region 416 of the light-outceasing surface 41 of the fourth lens 4 is convex, and the optical axis region 425 of the light-incident surface 42 of the fourth lens 4 is convex, and the circumferential region 426 of the light-incident surface 42 is concave. The sixth lens 6 has a positive refractive index. It should be noted that, in order to clearly show the drawing, the labels of the optical axis region and the circumferential region that are similar in shape to the first embodiment are omitted in Figure 39.

[0088] The detailed optical data of the optical imaging lens 10 of the ninth embodiment is shown in Figure 41. The effective focal length of the optical imaging lens 10 of the ninth embodiment is 3.011 mm, the half field of view (HFOV) is 37.200°, the aperture value (Fno) is 1.454, the system length (TTL) is 4.333 mm, and the image height (ImgH) is 2.283 mm.

[0089] As shown in 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 represented in formula (1).

[0090] Furthermore, the relationship between the important parameters in the optical imaging lens 10 of the ninth embodiment is shown in Figure 45.

[0091] As shown in Figure 40A, the longitudinal spherical aberration of this ninth embodiment controls the imaging point deviation of off-axis rays at different heights within ±0.012 mm. In the field curvature aberration diagrams of Figures 40B and 40C, the focal length variation of the three representative wavelengths across the entire field of view falls within ±0.12 mm. The distortion aberration diagram in Figure 40D shows that the distortion aberration of this ninth embodiment is maintained within ±5%.

[0092] As can be seen from the above description, the system length of the ninth embodiment is shorter than that of the first embodiment, and the distortion of the ninth embodiment is better than that of the first embodiment. Furthermore, the ninth embodiment also has a larger image height.

[0093] In summary, when the optical lens group 10 satisfies EDmax / EDmin ≦ 2.100, it helps to effectively converge the main light and edge light emitted from the multi-source light generation unit 15 from the light-incident side A2, enabling them to be projected onto the light-exit side A1 at a high proportion, thus improving the projection effect. When each embodiment meets the following conditions: the first lens 1 has a negative refractive index, the fourth lens 4 has a negative refractive index, the circumferential region 516 of the light-exit surface 51 of the fifth lens 5 is concave, and the circumferential region 626 of the light-incident surface 62 of the sixth lens 6 is convex, it can converge light rays at different angles and correct the aberration of the central field of view of the projected image surface. Furthermore, when the surface shape of the circumferential region of a specific lens is matched, and the condition V1+V2+V3 ≦ 140 is satisfied, it is beneficial to provide an optical lens group 10 with better projection quality and better chromatic aberration. In some embodiments, the preferred limitation can be 97 ≦ V1+V2+V3 ≦ 131.

[0094] In some embodiments, when the second lens 2 has a positive refractive index and the fifth lens 5 has a positive refractive index, the assembly yield and imaging quality can be further improved.

[0095] In some embodiments, when the optical lens group 10 satisfies EDmax / EDmin ≤ 2.100, and further satisfies that the first lens 1 has a negative refractive index, and the optical axis region 115 of the light-emitting surface 11 of the first lens 1 is convex, the fourth lens 4 has a negative refractive index, the circumferential region 516 of the light-emitting surface 51 of the fifth lens 5 is concave, and the optical axis region 625 of the light-incident surface 62 of the sixth lens 6 is concave, light rays from different angles can be converged, correcting the aberration in the central field of view of the projected image. Furthermore, when the surface shape of the circumferential region of a specific lens is matched, and the condition V1+V3 ≤ 100 is satisfied, it is beneficial to provide an optical lens group 10 with better projection quality and better chromatic aberration. In some embodiments, a preferred limitation is 56 ≤ V1+V3 ≤ 94. Furthermore, when the second lens 2 and the fifth lens 5 further satisfy the condition that they have positive refractive indices, assembly yield and imaging quality can be improved.

[0096] In some embodiments, when the optical lens group 10 satisfies EDmax / EDmin ≤ 2.100, and further satisfies that the first lens 1 has a negative refractive index, and the optical axis region 115 of the light-emitting surface 11 of the first lens 1 is convex, the circumferential region 216 of the light-emitting surface 21 of the second lens 2 is convex, the fourth lens 4 has a negative refractive index, and the optical axis region 625 of the light-incident surface 62 of the sixth lens 6 is concave and the circumferential region 626 is convex, light rays at different angles can be converged, correcting the aberration in the central field of view of the projected image. Furthermore, when the surface shape of the circumferential region of a specific lens is matched, and the condition V1+V3 ≤ 100 is satisfied, it is beneficial to provide an optical lens group 10 with better projection quality and better chromatic aberration. In some embodiments, a preferred limitation is 56 ≤ V1+V3 ≤ 94. Furthermore, when the second lens 2 and the fifth lens 5 further satisfy the condition that they have positive refractive indices, assembly yield and imaging quality can be improved.

[0097] In some embodiments, when the materials of the first lens 1 to the sixth lens 6 conform to the following configuration relationship, it is beneficial to the transmission and refraction of imaging light, while effectively improving chromatic aberration, so that the projection lens matched with the optical lens group 10 has excellent optical quality. For example: V1+V2+V4≦150; V1+V4≦123. A preferred limitation is: 79≦V1+V2+V4≦150; 38≦V1+V4≦112.

[0098] The optical lens group 10 of the present invention can further satisfy 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 the assembly or increasing the difficulty of manufacturing. For example: TTL / EFL≦1.600;3.800≦TTL / BFL;2.900≦EFL / BFL;4.700≦(ImgH+T2+G23+T3+T5+G56+T6) / BFL;4.700≦(EFL+T2+G23+T3+T5+G56+T6 ) / (G34+T4+G45+T5);2.800≦ImgH*Fno / (G34+T4+G45+T5);3.900≦ImgH*Fno / BFL;6.800≦EFL*Fno / (T1+G12);2.900≦(ImgH+G56) / BFL. The preferred limits are: 1.200≦TTL / EFL≦1.500; 4.300≦TTL / BFL≦7.800; 3.300≦EFL / BFL≦5.400; 5.200≦(ImgH+T2+G23+T3+T5+G56+T6) / BFL≦8.600; 5.200≦(EFL+T2+G23+T3+T5+G56+T6) / (G34+T4+G45+T5) ≦9.800;3.100≦ImgH*Fno / (G34+T4+G45+T5)≦7.500;4.300≦ImgH*Fno / BFL≦ 6.000;7.500≦EFL*Fno / (T1+G12)≦19.400;3.200≦(ImgH+G56) / BFL≦5.200.

[0099] In some embodiments, when the optical lens group 10 of the present invention can further satisfy the following conditions, it helps to maintain the thickness and spacing of each lens at an appropriate value, avoiding any parameter being too large and thus detrimental to the overall thinning of the optical lens group 10, or avoiding any parameter being too small and thus affecting assembly or increasing manufacturing difficulty. For example: 6.100 ≦ TTL / (T1+G12+G34); 3.600 ≦ TTL / (G34+T4+G45+T5); 1.800 ≦ (T2+G23+T3+G56) / (T4+G45+T5); 2.300 ≦ (T2+G23+T3) / (T1+G12);2.300≦(T2+G23+T3+T5+G56+T6) / BFL;6.300≦(T2+G23+T3+G56)*Fno / (T1+G12+G34);5 .000≦TL / (G12+G34+G45);3.300≦ALT / (T1+T4);6.500≦ALT / (G12+G34);4.800≦(T2+T3+G56) / (G12+G34);1.800≦ (T2+T3+T4+T5+T6) / BFL. The preferred limits are: 6.8 ≦ TTL / (T1+G12+G34) ≦ 12.400; 4.100 ≦ TTL / (G34+T4+G45+T5) ≦ 7.400; 2.100 ≦ (T2+G23+T3+G56) / (T4+G45+T5) ≦ 4.000;2.500≦(T2+G23+T3) / (T1+G12)≦4.800;2.600≦(T2+G23+T3+T5+G56+T6) / B FL≦4.700;7.000≦(T2+G23+T3+G56)*Fno / (T1+G12+G34)≦16.000;5.500≦TL / (G12 +G34+G45)≦21.500;3.700≦ALT / (T1+T4)≦4.700;7.300≦ALT / (G12+G34)≦27.600; 5.300≦(T2+T3+G56) / (G12+G34)≦23.000; 2.000≦(T2+T3+T4+T5+T6) / BFL≦3.800.

[0100] 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.

[0101] In view of the unpredictability of optical system design, under the framework of the present invention, meeting the above-mentioned conditions can better shorten the system length, increase the usable aperture, improve the optical quality, or improve the assembly yield, thereby improving the shortcomings of the prior art.

[0102] 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.

[0103] 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.

[0104] 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 comparison relationships between the optical parameters, and the conditional ranges covered by the multiple embodiments are as follows:

[0105] 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.

[0106] The relationship between optical parameters, for example: A is greater than B or A is less than B.

[0107] The conditional range covered by the 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 the multiple embodiments of the present invention, and γ2 is the minimum value in the multiple embodiments of the present invention.

[0108] 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.

[0109] 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.

[0110] 1: First lens 2: Second lens 3: Third lens 4: Fourth Lens 5: Fifth Lens 6: Sixth Lens 10: Optical lens group 11, 21, 31, 41, 51, 61, 110, 410, 510: Light-emitting surface 12, 22, 32, 42, 52, 62, 120, 320: Surface facing the light 15: Multi-source generation unit 20: Projection lens 15a: Light source 100, 200, 300, 400, 500: Lenses 100a: Light-emitting surface 115, 125, 215, 225, 315, 325, 415, 425, 515, 525, 615, 625, Z1: Optical axis region 116, 126, 216, 226, 316, 326, 416, 426, 516, 526, 616, 626, Z2: Circular region 130: Assembly Department 211, 212: Parallel rays a, b, c, L1, L2, L3, L4, L5: Beams A1: Light-emitting side A2: Incident light side C1: First curve C2: Second Curve CP: Center point CP1: First center point CP2: Second center point EDmax: The maximum effective diameter among the first to sixth lenses. EDmin: The minimum effective diameter among the first to sixth lenses. EL: Extension line FS: Freeform Surface I: optical axis LCR: Radius of the luminous circle Lm: Edge ray Lc: Main Ray M, R: Intersection points RS: Reference plane RP: Reference Point OB: Optical boundary ST: Aperture TP1: First conversion point TP2: Second conversion point Z3: Relay Area ω: Half field of view

Claims

1. An optical lens assembly suitable for use in a projection lens, wherein the optical lens assembly is used to generate multiple light beams from multiple light emitted by a multi-source generating unit, wherein the direction toward the multi-source generating unit is an incident light side, and the opposite side is an exit light side, the optical lens assembly sequentially comprising 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 exit light side to the incident light side, and each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens includes an exit light surface facing the exit light side and an incident light surface facing the incident light side, wherein... The projection lens satisfies the following condition: EDmax / EDmin ≦ 2.100; the first lens has a negative refractive index; the optical axis region of the light-emitting surface of the first lens is convex; the fourth lens has a negative refractive index; the circumferential region of the light-emitting surface of the fifth lens is concave; the circumferential region of the light-incident surface of the sixth lens is convex; the optical lens group has only the above six lenses and satisfies the following condition: V1+V2+V3 ≦ 140, 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, V1 is the Vd Abbe number of the first lens, V2 is the Vd Abbe number of the second lens, and V3 is the Vd Abbe number of the third lens.

2. An optical lens assembly, suitable for use in a projection lens, wherein the optical lens assembly is used to generate multiple light beams from multiple light emitted by a multi-source generating unit, wherein the direction toward the multi-source generating unit is an incident light side, and the opposite side is an exit light side, the optical lens assembly sequentially comprising 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 exit light side to the incident light side, and each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens includes an exit light surface facing the exit light side and an incident light surface facing the incident light side, wherein... The projection lens satisfies the following condition: EDmax / EDmin≦2.100; the first lens has a negative refractive index; the optical axis region of the light-emitting surface of the first lens is convex; the fourth lens has a negative refractive index; the circumferential region of the light-emitting surface of the fifth lens is concave; the optical axis region of the light-incident surface of the sixth lens is concave; the optical lens group consists of only the above six lenses and satisfies the following condition: V1+V3≦100, 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, V1 is the Vd Abbe number of the first lens, and V3 is the Vd Abbe number of the third lens.

3. An optical lens assembly suitable for use in a projection lens, wherein the optical lens assembly is used to generate multiple light beams from multiple light sources emitted by a multi-source generating unit, wherein the direction toward the multi-source generating unit is an incident light side, and the opposite side is an exit light side, the optical lens assembly sequentially comprising 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 exit light side to the incident light side, and each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens includes an exit light surface facing the exit light side and an incident light surface facing the incident light side, wherein... The projection lens satisfies the following condition: EDmax / EDmin ≦ 2.100; the first lens has a negative refractive index; the optical axis region of the light-emitting surface of the first lens is convex; the circumferential region of the light-emitting surface of the second lens is convex; the fourth lens has a negative refractive index; the circumferential region of the light-emitting surface of the fifth lens is concave; the optical axis region of the light-incident surface of the sixth lens is concave; the circumferential region of the light-incident surface of the sixth lens is convex; the optical lens group consists of only the above six lenses and satisfies the following condition: V1+V3 ≦ 100, 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, V1 is the Vd Abbe number of the first lens, and V3 is the Vd Abbe number of the third lens.

4. The optical lens assembly as claimed in any one of claims 1 to 3, wherein the optical lens assembly further satisfies the following formula: TTL / EFL ≤ 1.600, where TTL is the distance on the optical axis from the light-emitting surface of the first lens to the light-emitting surface of the multi-source generating unit, and EFL is the effective focal length of the optical lens assembly.

5. An optical lens assembly as claimed in any one of claims 1 to 3, wherein the optical lens assembly further satisfies the following formula: 4.700≦(EFL+T2+G23+T3+T5+G56+T6) / (G34+T4+G45+T5), where EFL is the effective focal length of the optical lens assembly, 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, T6 is the thickness of the sixth lens on the optical axis, G23 is the air gap between the second lens and the third lens on the optical axis, G34 is the air gap between the third lens and the fourth lens on the optical axis, G45 is the air gap between the fourth lens and the fifth lens on the optical axis, and G56 is the air gap between the fifth lens and the sixth lens on the optical axis.

6. The optical lens assembly as claimed in any one of claims 1 to 3, wherein the optical lens assembly further satisfies the following formula: 3.600≦TTL / (G34+T4+G45+T5), where TTL is the distance on the optical axis from the light-emitting surface of the first lens to the light-emitting surface of the multi-source generating unit, G34 is the air gap on the optical axis between the third lens and the fourth lens, G45 is the air gap on the optical axis between the fourth lens and the fifth lens, T4 is the thickness on the optical axis of the fourth lens, and T5 is the thickness on the optical axis of the fifth lens.

7. The optical lens assembly as claimed in any one of claims 1 to 3, wherein the optical lens assembly further satisfies the following formula: 3.900≦ImgH*Fno / BFL, where ImgH is the maximum image height of the optical lens assembly, Fno is the aperture value of the optical lens assembly, and BFL is the distance on the optical axis from the incident surface of the sixth lens to the emitting surface of the multi-source generating unit.

8. The optical lens assembly as claimed in any one of claims 1 to 3, wherein the optical lens assembly further satisfies the following formula: 1.800≦(T2+G23+T3+G56) / (T4+G45+T5), 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, G23 is the air gap between the second lens and the third lens on the optical axis, G45 is the air gap between the fourth lens and the fifth lens on the optical axis, and G56 is the air gap between the fifth lens and the sixth lens on the optical axis.

9. An optical lens assembly as claimed in any one of claims 1 to 3, wherein the optical lens assembly further satisfies the following formula: 2.300≦(T2+G23+T3) / (T1+G12), where T1 is the thickness of the first lens on the optical axis, T2 is the thickness of the second lens on the optical axis, T3 is the thickness of the third lens on the optical axis, G12 is the air gap between the first lens and the second lens on the optical axis, and G23 is the air gap between the second lens and the third lens on the optical axis.

10. The optical lens assembly of any one of claims 1 to 3, wherein the optical lens assembly further satisfies the following formula: 2.900 ≤ EFL / BFL, where EFL is the effective focal length of the optical lens assembly and BFL is the distance on the optical axis from the incident surface of the sixth lens to the emitting surface of the multi-source generating unit.

11. The optical lens assembly as claimed in any one of claims 1 to 3, wherein the optical lens assembly further satisfies the following formula: 2.300 ≦ (T2 + G23 + T3 + T5 + G56 + T6) / BFL, 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, T5 is the thickness of the fifth lens on the optical axis, T6 is the thickness of the sixth lens on the optical axis, G23 is the air gap between the second lens and the third lens on the optical axis, G56 is the air gap between the fifth lens and the sixth lens on the optical axis, and BFL is the distance on the optical axis from the light-incident surface of the sixth lens to the light-emitting surface of the multi-source generating unit.

12. The optical lens assembly as claimed in any one of claims 1 to 3, wherein the optical lens assembly further satisfies the following formula: 4.700≦(ImgH+T2+G23+T3+T5+G56+T6) / BFL, where ImgH is the maximum image height of the optical lens assembly, T2 is the thickness of the second lens on the optical axis, T3 is the thickness of the third lens on the optical axis, T5 is the thickness of the fifth lens on the optical axis, T6 is the thickness of the sixth lens on the optical axis, G23 is the air gap between the second lens and the third lens on the optical axis, G56 is the air gap between the fifth lens and the sixth lens on the optical axis, and BFL is the distance on the optical axis from the incident surface of the sixth lens to the emitting surface of the multi-source generating unit.

13. The optical lens assembly as claimed in any one of claims 1 to 3, wherein the optical lens assembly further satisfies the following formula: 6.100≦TTL / (T1+G12+G34), where TTL is the distance on the optical axis from the light-emitting surface of the first lens to the light-emitting surface of the multi-source generating unit, T1 is the thickness of the first lens on the optical axis, G12 is the air gap on the optical axis between the first lens and the second lens, and G34 is the air gap on the optical axis between the third lens and the fourth lens.

14. The optical lens group as claimed in any one of claims 1 to 3, wherein the optical lens group further satisfies the following formula: 2.800≦ImgH*Fno / (G34+T4+G45+T5), where ImgH is the maximum image height of the optical lens group, Fno is the aperture value of the optical lens group, G34 is the air gap between the third lens and the fourth lens on the optical axis, G45 is the air gap between the fourth lens and the fifth lens on the optical axis, T4 is the thickness of the fourth lens on the optical axis, and T5 is the thickness of the fifth lens on the optical axis.

15. The optical lens assembly as claimed in any one of claims 1 to 3, wherein the optical lens assembly further satisfies the following formula: 3.800 ≤ TTL / BFL, where TTL is the distance on the optical axis from the light-emitting surface of the first lens to the light-emitting surface of the multi-source generating unit, and BFL is the distance on the optical axis from the light-incident surface of the sixth lens to a light-emitting surface of the multi-source generating unit.

16. The optical lens group as claimed in any one of claims 1 to 3, wherein the optical lens group further satisfies the following formula: 6.800≦EFL*Fno / (T1+G12), where EFL is the effective focal length of the optical lens group, Fno is the aperture value of the optical lens group, T1 is the thickness of the first lens on the optical axis, and G12 is the air gap between the first lens and the second lens on the optical axis.

17. The optical lens assembly as claimed in any one of claims 1 to 3, wherein the optical lens assembly further satisfies the following formula: 2.900≦(ImgH+G56) / BFL, where ImgH is the maximum image height of the optical lens assembly, G56 is the air gap between the fifth lens and the sixth lens on the optical axis, and BFL is the distance on the optical axis from the incident surface of the sixth lens to a light-emitting surface of the multi-source generating unit.

18. An optical lens group as claimed in any one of claims 1 to 3, wherein the optical lens group further satisfies the following formula: 6.300≦(T2+G23+T3+G56)*Fno / (T1+G12+G34), where T1 is the thickness of the first lens on the optical axis, T2 is the thickness of the second lens on the optical axis, T3 is the thickness of the third lens on the optical axis, G12 is the air gap between the first lens and the second lens on the optical axis, G23 is the air gap between the second lens and the third lens on the optical axis, G34 is the air gap between the third lens and the fourth lens on the optical axis, G56 is the air gap between the fifth lens and the sixth lens on the optical axis, and Fno is the aperture value of the optical lens group.

19. The optical lens assembly of any one of claims 1 to 3, wherein the optical lens assembly further satisfies the following formula: 5.000≦TL / (G12+G34+G45), where TL is the distance on the optical axis from the light-emitting surface of the first lens to the light-incident surface of the sixth lens, G12 is the air gap on the optical axis between the first lens and the second lens, G34 is the air gap on the optical axis between the third lens and the fourth lens, and G45 is the air gap on the optical axis between the fourth lens and the fifth lens.

20. The optical lens assembly of any one of claims 1 to 3, wherein the optical lens assembly further satisfies the following formula: 3.300 ≦ ALT / (T1+T4), where ALT is the sum of the thicknesses of the six lenses on the optical axis, T1 is the thickness of the first lens on the optical axis, and T4 is the thickness of the fourth lens on the optical axis.