Optical lens set

Abstract

The present invention provides an optical lens group, which includes first to sixth lenses in sequence along the optical axis from the first side to the second side. The optical lens group satisfies the conditional expressions of V1+V2+V6≦120.000 and EFL*Fno / D11t22≦11.500. In addition, other optical lens groups are also provided. By satisfying the above-mentioned concave and convex surface arrangement design of the lenses, the conditions of the refractive index and the design satisfying the above-mentioned conditional expressions, the optical lens group allows multiple wavelengths of light to pass through while maintaining good optical quality, short system length, technical feasibility, and good thermal stability.

Description

Technical Field

[0001] The invention relates to the field of optics, and in particular to an optical lens group. Background Art

[0002] The specifications of portable electronic devices are changing with each passing day, and their key components - optical lens groups are also becoming more diversified. With the virtual reality (VR) / augmented reality (AR) craze driving the accelerated development of head-mounted wearable devices and peripheral devices. Therefore, in addition to being used for video and recording, optical lens groups can also be designed to use the principle of optical reflection to project information or images on the lenses of head-mounted wearable devices, and then reflect the information or images into the user's eyes to achieve the effect of augmented reality.

[0003] However, since different colors of projected light sources have different wavelengths, and the optical lens group also needs to be suitable for different ambient temperatures, to prevent the information or images from being affected by the ambient temperature and becoming unclear. Moreover, the information or images projected by the optical lens group are not only suitable for dark places, but also for various environments such as indoors or outdoors. Therefore, how to design an optical lens with a small size, large aperture, high thermal stability, and simultaneous application in light sources of different wavelengths constitutes a major design challenge in the industry. Summary of the invention

[0004] The present invention provides an optical lens group, which can maintain good optical quality when multiple wavelengths of light pass through, has a short system length, a large aperture, and good thermal stability.

[0005] One embodiment of the present invention provides an optical lens group, which includes an aperture, a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens in sequence along the optical axis from the first side to the second side. The first side is the light-emitting side or the object side. The second side is the light-entering side or the image side. The first lens to the sixth lens each include a first side surface facing the first side and allowing the imaging light to pass through, and a second side surface facing the second side and allowing the imaging light to pass through. The first lens has a negative refractive power. An optical axis region of the second side surface of the fourth lens is a concave surface. The lenses of the optical lens group are composed of the above six lenses and satisfy the following conditional formulas: V1+V2+V6≦120.000 and EFL*Fno / D11t22≦11.500.

[0006] One embodiment of the present invention provides an optical lens group, which includes an aperture, a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens in sequence along the optical axis from the first side to the second side. The first side is the light exit side or the object side. The second side is the light entrance side or the image side. The first lens to the sixth lens each include a first side surface facing the first side and allowing the imaging light to pass through, and a second side surface facing the second side and allowing the imaging light to pass through. The first lens has a negative refractive power and the optical axis area of ​​the first side surface of the first lens is a convex surface. The second lens has a positive refractive power. An optical axis area of ​​the first side surface of the fourth lens is a convex surface. The lenses of the optical lens group are composed of the above six lenses and satisfy the following conditional formulas: V1+V2+V6≦120.000 and EFL*Fno / D11t22≦11.500.

[0007] One embodiment of the present invention provides an optical lens group, which includes an aperture, a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens in sequence along the optical axis from the first side to the second side. The first side is the light exit side or the object side. The second side is the light entrance side or the image side. The first lens to the sixth lens each include a first side surface facing the first side and allowing the imaging light to pass through, and a second side surface facing the second side and allowing the imaging light to pass through. The first lens has a negative refractive power. The second lens has a positive refractive power. The optical axis area of ​​the first side surface of the fourth lens is a convex surface. The circumferential area of ​​the second side surface of the sixth lens is a convex surface. The lenses of the optical lens group are composed of the above six lenses and satisfy the following conditional formulas: V1+V2+V6≦120.000 and EFL*Fno / D11t22≦11.500.

[0008] One embodiment of the present invention provides an optical lens group, which includes an aperture, a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens in order from the first side to the second side along the optical axis. The first side is the light exit side or the object side. The second side is the light entrance side or the image side. The first lens to the sixth lens each include a first side surface facing the first side and allowing the imaging light to pass through and a second side surface facing the second side and allowing the imaging light to pass through. The first lens has a negative refractive power and satisfies the conditions of V1+V2+V6≦120.000 and EFL*Fno / D11t22≦8.100, and is matched with any of the following combinations of surface shape and refractive power:

[0009] An optical axis region of the second side surface of the fifth lens is a concave surface; or

[0010] The second lens has positive refractive power and an optical axis region of the first side surface of the fifth lens is a convex surface.

[0011] One embodiment of the present invention provides an optical lens group, which includes an aperture, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens in order from the first side to the second side along the optical axis. The first side is a light-emitting side or an object side. The second side is a light-entering side or an image side. The first lens to the sixth lens each include a first side surface facing the first side and allowing light to pass through, and a second side surface facing the second side and allowing light to pass through. The optical axis area of ​​the second side surface of the second lens is a concave surface, and the optical axis area of ​​the second side surface of the fifth lens is a concave surface, and the following conditional formula is satisfied: T2 / T avg ≧1.500, and further with any one of the following conditions: the first lens has a negative refractive power, the third lens has a positive refractive power, the circumferential region of the first side surface of the fourth lens is concave, the optical axis region of the second side surface of the fourth lens is concave, the fifth lens has a positive refractive power, the optical axis region of the first side surface of the fifth lens is convex, the sixth lens has a negative refractive power, the optical axis region of the first side surface of the sixth lens is concave, the circumferential region of the first side surface of the sixth lens is concave, or the optical axis region of the second side surface of the sixth lens is convex.

[0012] One embodiment of the present invention provides an optical lens group, which includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens in order from the first side to the second side along the optical axis. The first side is a light exit side or an object side. The second side is a light entrance side or an image side. The first lens to the sixth lens each include a first side surface facing the first side and allowing imaging light to pass through and a second side surface facing the second side and allowing imaging light to pass through. The first lens has a negative refractive power, the optical axis area of ​​the first side surface of the first lens is a convex surface, the second lens has a positive refractive power, the optical axis area of ​​the second side surface of the second lens is a concave surface, the third lens has a positive refractive power, the optical axis area of ​​the second side surface of the fifth lens is a concave surface, and satisfies the following conditional formula: TTL*Fno / D22t62≦3.400, and is further matched with any one of the following conditions: the optical axis area of ​​the first side surface of the fourth lens is a convex surface, the optical axis area of ​​the second side surface of the fourth lens is a concave surface, the sixth lens has a negative refractive power, the optical axis area of ​​the first side surface of the sixth lens is a concave surface or the optical axis area of ​​the second side surface of the sixth lens is a convex surface.

[0013] In the optical lens assembly of the embodiment of the present invention, the absolute value of the focal length offset at a temperature of 0° C. to 70° C. is less than or equal to 0.030 mm.

[0014] The above optical lens assembly may also selectively satisfy any of the following conditions:

[0015] TTL*Fno / D22t62≦3.400,

[0016] T2 / T avg ≧1.500,

[0017] TTL / AAG≦3.500,

[0018] TL / (G23+G34+G45+G56)≦3.700,

[0019] ALT / (T1+T2)≦3.000,

[0020] D11t32 / (G34+G56)≦3.800,

[0021] TTL / EFL≦1.900,

[0022] TL*Fno / EFL≦3.000,

[0023] ALT36 / (G45+G56)≦2.500,

[0024] D11t32 / (G34+G45)≦5.100,

[0025] (ALT+BFL) / D31t51≦3.100,

[0026] (T max +T min ) / G34≦6.000,

[0027] ALT46 / T3≦3.100,

[0028] (T1+G12+T2) / G23≦6.800,

[0029] ALT / (T2+T3)≦2.600,

[0030] TTL / D31t51≦4.000,

[0031] (D11t22+BFL) / T max ≦2.800.

[0032] Wherein, V1 is the Abbe number of the first lens, V2 is the Abbe number of the second lens, V6 is the Abbe number of the sixth lens; 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; 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.

[0033] 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; G45 is the air gap between the fourth lens and the fifth lens on the optical axis; G56 is the air gap between the fifth lens and the sixth lens on the optical axis.

[0034] AAG is the sum of the five air gaps of the first to sixth lenses on the optical axis, that is, the sum of G12, G23, G34, G45 and G56; ALT is the sum of the six thicknesses of the first to sixth lenses on the optical axis, that is, the sum of T1, T2, T3, T4, T5 and T6; ALT36 is the sum of the four thicknesses of the third to sixth lenses on the optical axis, that is, the sum of T3, T4, T5 and T6; ALT46 is the sum of the three thicknesses of the fourth to sixth lenses on the optical axis, that is, the sum of T4, T5 and T6; TL is the thickness of the first lens The distance from the first surface of the first lens to the second surface of the sixth lens on the optical axis; TTL is the distance from the first surface of the first lens to the light-emitting surface on the optical axis; D11t22 is the distance from the first surface of the first lens to the second surface of the second lens on the optical axis; D11t32 is the distance from the first surface of the first lens to the second surface of the third lens on the optical axis; D22t62 is the distance from the second surface of the second lens to the second surface of the sixth lens on the optical axis; D31t51 is the distance from the first surface of the third lens to the first surface of the fifth lens on the optical axis; BFL is the distance from the second surface of the sixth lens to the light-emitting surface on the optical axis; T max T is the thickness of the thickest lens on the optical axis of the optical lens group; min T is the thickness of the thinnest lens on the optical axis of the optical lens group; avg is the average thickness of all lenses in the optical lens group on the optical axis; LCR (Light circle radius) is the radius of the light circle (marked as LCR, such as Figure 1 ω is the half field angle, which is the maximum half light output angle of the optical lens group according to the reversibility principle of light; Fno is the aperture value, which is the aperture value calculated based on the effective aperture of the optical lens group emitting parallel light according to the reversibility principle of light; EFL is the effective focal length of the optical lens group.

[0035] Based on the above, the beneficial effects of the optical lens assembly of the embodiment of the present invention are: by satisfying the above-mentioned concave and convex surface arrangement design of the lens, the refractive index conditions and the design that satisfies the above-mentioned conditional formula, the optical lens assembly allows multiple wavelengths of light to pass through while still maintaining good optical quality, short system length, technical feasibility, and good thermal stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A is a schematic diagram illustrating the application of the optical lens assembly of the present invention to a projection lens.

[0037] Figure 1 B is Figure 1 A is a front view of an embodiment of a multi-light source generating unit.

[0038] Figure 2 It is a schematic diagram illustrating the surface structure of a lens.

[0039] Figure 3 It is a schematic diagram illustrating the concave-convex structure of a lens surface and the focus of light.

[0040] Figure 4 is a schematic diagram illustrating the surface structure of a lens of Example 1.

[0041] Figure 5 is a schematic diagram illustrating the surface structure of a lens of Example 2.

[0042] Figure 6 is a schematic diagram illustrating the surface structure of a lens of Example 3.

[0043] Figure 7 FIG. 4 is a schematic diagram of an optical lens assembly according to a first embodiment of the present invention.

[0044] Figure 8 Graphs showing the longitudinal spherical aberration and various aberrations of the optical lens assembly of the first embodiment.

[0045] Fig. 9 It is a table diagram of detailed optical data of the optical lens assembly of the first embodiment of the present invention.

[0046] Fig.10 It is a table diagram of aspheric parameters of the optical lens assembly according to the first embodiment of the present invention.

[0047] Fig.11 FIG. 4 is a schematic diagram of an optical lens assembly according to a second embodiment of the present invention.

[0048] Fig.12 Graphs showing the longitudinal spherical aberration and various aberrations of the optical lens assembly of the second embodiment.

[0049] Fig.13 It is a table diagram of detailed optical data of the optical lens assembly of the second embodiment of the present invention.

[0050] Fig.14 It is a table diagram of aspheric parameters of the optical lens assembly according to the second embodiment of the present invention.

[0051] Fig.15 FIG. 4 is a schematic diagram of an optical lens assembly according to a third embodiment of the present invention.

[0052] Fig.16 Graphs showing the longitudinal spherical aberration and various aberrations of the optical lens assembly of the third embodiment.

[0053] Fig.17 It is a table diagram of detailed optical data of the optical lens assembly according to the third embodiment of the present invention.

[0054] Fig.18 It is a table diagram of aspheric parameters of the optical lens assembly according to the third embodiment of the present invention.

[0055] Fig.19 FIG. 4 is a schematic diagram of an optical lens assembly according to a fourth embodiment of the present invention.

[0056] Fig. 20 Graphs showing the longitudinal spherical aberration and various aberrations of the optical lens assembly of the fourth embodiment.

[0057] Fig.21 It is a table diagram of detailed optical data of the optical lens assembly according to the fourth embodiment of the present invention.

[0058] Fig. 22 It is a table diagram of aspheric parameters of the optical lens assembly according to the fourth embodiment of the present invention.

[0059] Fig.23 FIG. 5 is a schematic diagram of an optical lens assembly according to a fifth embodiment of the present invention.

[0060] Fig.24 Graphs showing the longitudinal spherical aberration and various aberrations of the optical lens assembly of the fifth embodiment.

[0061] Fig.25 It is a table diagram of detailed optical data of the optical lens assembly of the fifth embodiment of the present invention.

[0062] Fig.26 It is a table diagram of aspheric parameters of the optical lens assembly according to the fifth embodiment of the present invention.

[0063] Fig. 27 FIG. 4 is a schematic diagram of an optical lens assembly according to a sixth embodiment of the present invention.

[0064] Fig.28 Graphs showing the longitudinal spherical aberration and various aberrations of the optical lens assembly of the sixth embodiment.

[0065] Fig.29 It is a table diagram of detailed optical data of the optical lens assembly according to the sixth embodiment of the present invention.

[0066] Fig.30 It is a table diagram of aspheric parameters of the optical lens assembly according to the sixth embodiment of the present invention.

[0067] Fig.31 FIG. 4 is a schematic diagram of an optical lens assembly according to a seventh embodiment of the present invention.

[0068] Fig.32 Graphs showing the longitudinal spherical aberration and various aberrations of the optical lens assembly of the seventh embodiment.

[0069] Fig.33 It is a table diagram of detailed optical data of the optical lens assembly according to the seventh embodiment of the present invention.

[0070] Fig.34 It is a table diagram of aspheric parameters of the optical lens assembly according to the seventh embodiment of the present invention.

[0071] Fig.35 FIG. 4 is a schematic diagram of an optical lens assembly according to an eighth embodiment of the present invention.

[0072] Fig.36 Graphs showing the longitudinal spherical aberration and various aberrations of the optical lens assembly of the eighth embodiment.

[0073] Fig.37 It is a table diagram of detailed optical data of the optical lens assembly according to the eighth embodiment of the present invention.

[0074] Fig.38 It is a table diagram of aspheric parameters of the optical lens assembly according to the eighth embodiment of the present invention.

[0075] Fig.39 FIG. 4 is a schematic diagram of an optical lens assembly according to a ninth embodiment of the present invention.

[0076] Fig.40 Graphs showing the longitudinal spherical aberration and various aberrations of the optical lens assembly of the ninth embodiment.

[0077] Fig.41 It is a table diagram of detailed optical data of the optical lens assembly according to the ninth embodiment of the present invention.

[0078] Fig.42 It is a table diagram of aspheric parameters of the optical lens assembly according to the ninth embodiment of the present invention.

[0079] Fig.43 It is a numerical table diagram of important parameters and their relationship expressions of the optical lens assembly of the first to fifth embodiments of the present invention.

[0080] Fig.44 It is a numerical table diagram of important parameters and their relationship expressions of the optical lens assembly of the sixth to ninth embodiments of the present invention. DETAILED DESCRIPTION

[0081] Before describing the present invention in detail, the symbols in the accompanying drawings are first clearly indicated: 0: aperture; 1: first lens; 2: second lens; 3: third lens; 4: fourth lens; 5: fifth lens; 6: sixth lens; 10: optical lens group; 15, 25, 35, 45, 55, 65: first side surface; 16, 26, 36, 46, 56, 66: second side surface; 100a: reference surface; 100, 200, 300, 400, 500: lens; 130: assembly part; 151, 162, 251, 262, 351, 362, 451, 462, 551, 561, 562, 652, 661, Z1: optical axis area; 153, 164, 2 53, 263, 264, 353, 354, 363, 364, 454, 463, 554, 563, 654, 662, 663, Z2: circular area; 211, 212: parallel light rays; a, b, c: imaging light rays; A1: first side; A2: second side; CP: center point; CP1: first center point; CP2: second center point; EL: extension line; I: optical axis; Lm: edge light; Lc: main light; LCR: luminous circle radius; M, R: intersection point; OB: optical boundary; P, Pa~Pc: light source; PM: multi-light source generating unit; TP1: first transition point; TP2: second transition point; Z3: relay area; ω: maximum half light output angle.

[0082] Please refer to Figure 1 A, in one embodiment, the optical lens assembly 10 of the embodiment of the present invention is suitable for projection. The light direction of the projection lens 20 is that a plurality of imaging light rays are emitted by the multi-light source generating unit PM, and a plurality of imaging light rays a, b, c with different exit angles are generated by the optical lens assembly 10 of the embodiment of the present invention, and are used to project to the front environment, wherein the range of the exit angle is, for example, within the range of -ω degrees to ω degrees, wherein ω is the maximum half-light exit angle of the optical lens assembly 10; the imaging light rays a, b, c are not limited to any form of imaging light rays, and the direction of the imaging light rays is described in the form of dotted lines, and the number of the imaging light rays a, b, c is not limited to 3, and the number can be other numbers not equal to 3 and 1, and Figure 1 In A, imaging rays a, b, and c are drawn as representatives, wherein imaging rays a, b, and c respectively have a chief ray and a marginal ray (not shown in the figure), and the chief ray and marginal ray of imaging ray a are approximately parallel to each other; similarly, the chief ray and marginal ray of imaging ray b are also approximately parallel to each other, and the chief ray and marginal ray of imaging ray c are also approximately parallel to each other. In detail, Figure 1 The imaging rays a, b, and c of A are respectively Figure 1 The light sources Pa, Pb, and Pc at different positions in B emit Figure 1It can be seen from A that the imaging light emitted by the light source P at different positions will all be emitted from the optical lens set 10 in a parallel manner after passing through the optical lens set 10, but the emission direction will be different depending on the position. Figure 1 For example, light source A at position A passes through the optical lens group 10 and is emitted from the optical lens group 10 in a direction obliquely to the lower left and in parallel (as shown by imaging light a), light source Pb at another position passes through the optical lens group 10 and is emitted from the optical lens group 10 in a direction exactly to the left and in parallel (as shown by imaging light b), and light source Pc at another position passes through the optical lens group 10 and is emitted from the optical lens group 10 in a direction obliquely to the upper left and in parallel (as shown by imaging light c).

[0083] Please refer to Figure 1 B, in one embodiment, the multi-light source generating unit PM includes a plurality of light sources P arranged in an array. The light source P is, for example, a near-infrared light source or a green light source, but the present invention is not limited thereto. In addition, in other embodiments, the arrangement of these light sources P may also be a circular arrangement or other arrangements, and the present invention is not limited thereto. The types of light sources P are, for example, laser diodes, light emitting diodes (Light Emitting Diode, LED), milli-light emitting diodes (Mini LED) or micro-light emitting diodes (Micro LED), wherein the size range of the milli-light emitting diodes is, for example, within the range of 75μm to 300μm, and the size range of the micro-light emitting diodes is, for example, less than 75μm. The light emitting surfaces of these light sources P form a reference surface 100a. In one embodiment, the reference surface 100a is the light emitting surface of the multi-light source generating unit PM.

[0084] It should be noted that if the optical lens assembly 10 of the embodiment of the present invention is used for projection, the judgment criteria for the optical specifications of the embodiment of the present invention described below are based on the assumption that the direction of the light is reversely tracked (Reversely Tracking) as a parallel imaging light from the first side through the optical lens assembly 10 to the reference surface 100a located on the second side for focusing and imaging, wherein the reference surface 100a is the light-emitting surface of the multi-light source generating unit PM, the second side is the side facing the multi-light source generating unit PM (i.e., the light-entering side), and the first side is the opposite side (i.e., the light-emitting side). In addition, if the optical lens assembly 10 of the embodiment of the present invention is used for projection, the second side surface of each lens of the optical lens assembly 10 described below refers to the surface facing the multi-light source generating unit PM (i.e., the light-entering surface), and the first side surface of each lens of the optical lens assembly 10 described below is the opposite side (i.e., the light-emitting surface).

[0085] If the optical lens assembly 10 of the embodiment of the present invention is used for imaging, the judgment criteria of the optical specifications of the embodiment of the present invention described below are based on the assumption that the light direction is traced as a parallel imaging light from the first side through the optical lens assembly 10 to the reference surface 100a located on the second side for focusing and imaging, wherein the reference surface 100a is the imaging surface, the second side is the side facing the imaging surface (i.e., the image side), and the first side is the side facing the object to be photographed (i.e., the object side). In addition, if the optical lens assembly 10 of the embodiment of the present invention is used for imaging, the second side surface of each lens of the optical lens assembly 10 described below refers to the surface facing the imaging surface (i.e., the image side), and the first side surface of each lens of the optical lens assembly 10 described below refers to the surface facing the object to be photographed (i.e., the object side).

[0086] 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.

[0087] The optical system of this specification includes at least one lens, which receives the imaging light of the incident optical system that is parallel to the optical axis and within a half-viewing angle (HFOV) relative to the optical axis. The imaging light is imaged on a reference plane through the optical system. The "lens has a positive refractive power (or negative refractive power)" refers to the paraxial refractive power of the lens calculated by Gaussian optical theory is positive (or negative). The "first side (or second side) of the lens" is defined as a specific range where the imaging light passes through the lens surface. The imaging light includes at least two types of light: the chief ray Lc and the marginal ray Lm (such as Figure 2 The first side surface (or the second side surface) of the lens can be divided into different regions according to different positions, including an optical axis region, a circumferential region, or one or more relay regions in some embodiments. The description of these regions will be described in detail below.

[0088] Figure 2 is a radial cross-sectional view of the lens 100. Two reference points on the surface of the lens 100 are defined: a center point and a transition point. The center point of the lens surface is an intersection of the surface and the optical axis I. Figure 2As shown in the example, the first center point CP1 is located on the first side 110 of the lens 100, and the second center point CP2 is located on the second side 120 of the lens 100. A transition point is a point on the lens surface, and the tangent of the point is perpendicular to the optical axis I. The optical boundary OB of the lens surface is defined as the point where the 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, if a single lens surface has multiple transition points, the transition points are named in sequence from the first transition point in the radial outward direction. For example, the first transition point TP1 (closest to the optical axis I), the second transition point TP2 (closest to the optical axis I), and the second transition point TP2 (closest to the optical axis I). Figure 5 as shown) and the Nth conversion point (farthest from the optical axis I).

[0089] The range from the center point to the first transition point TP1 is defined as the optical axis area, wherein the optical axis area includes the center point. The area from the Nth transition point farthest from the optical axis I to the optical boundary OB is defined as the circumferential area. In some embodiments, a relay area between the optical axis area and the circumferential area may be further included, and the number of relay areas depends on the number of transition points.

[0090] When a light ray parallel to the optical axis I passes through an area, if the light ray is deflected toward the optical axis I and the intersection with the optical axis I is located at the second side A2 of the lens, then the area is a convex surface. When a light ray parallel to the optical axis I passes through an area, if the extension line of the light ray intersects with the optical axis I at the first side A1 of the lens, then the area is a concave surface.

[0091] In addition, see Figure 2 The lens 100 may further 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 to a corresponding element (not shown) of the optical system. The imaging light does not reach the assembly portion 130. The structure and shape of the assembly portion 130 are merely examples for illustrating the present invention and are not intended to limit the scope of the present invention. The assembly portion 130 of the lens discussed below may be partially or completely omitted in the drawings.

[0092] See also Figure 3 , define the area between the center point CP and the first transition point TP1 as the optical axis area Z1. Define the area between the first transition point TP1 and the optical boundary OB of the lens surface as the circumferential area Z2. Figure 3 As shown, after passing through the optical axis area Z1, the parallel light 211 intersects with the optical axis I at the second side A2 of the lens 200, that is, the focus of the parallel light 211 passing through the optical axis area Z1 is located at point R on the second side A2 of the lens 200. Since the light intersects with the optical axis I at the second side A2 of the lens 200, the optical axis area Z1 is a convex surface. On the contrary, the parallel light 212 diverges after passing through the circumferential area Z2. Figure 3As shown, the extended line EL of the parallel light 212 after passing through the circumferential area Z2 intersects with the optical axis I at the first side A1 of the lens 200, that is, the focus of the parallel light 212 passing through the circumferential area Z2 is located at point M on the first side A1 of the lens 200. Since the extended line EL of the light intersects with the optical axis I at the first side A1 of the lens 200, the circumferential area Z2 is a concave surface. Figure 3 In the lens 200 shown, the first transition point TP1 is the boundary between the optical axis area and the circumferential area, that is, the first transition point TP1 is the boundary point where the convex surface turns into the concave surface.

[0093] On the other hand, the surface convexity of the optical axis area can also be determined according to the judgment method of the general knowledgeable person in the field, that is, the convexity of the surface shape of the optical axis area of ​​the lens can be determined by the positive and negative signs of the curvature radius of the paraxial axis (abbreviated as R value). R value can be commonly used in optical design software, such as Zemax or CodeV. R value is also commonly found in the lens data sheet of optical design software. For the first side, when the R value is positive, the optical axis area of ​​the first side is determined to be convex; when the R value is negative, the optical axis area of ​​the first side is determined to be concave. On the contrary, for the second side, when the R value is positive, the optical axis area of ​​the second side is determined to be concave; when the R value is negative, the optical axis area of ​​the second side is determined to be convex. The result of this method is consistent with the result of the above-mentioned determination method by the intersection of the light / light extension line and the optical axis. The determination method of the intersection of the light / light extension line and the optical axis is to determine the surface convexity by the focus of a light parallel to the optical axis being located on the first side or the second side of the lens. The terms “a region is convex (or concave)”, “a region is convex (or concave)” or “a convex (or concave) region” described in this specification can be used interchangeably.

[0094] Figures 4 to 6 Examples are provided for determining the surface shape and area boundaries of lens areas in various situations, including the aforementioned optical axis area, circumferential area, and relay area.

[0095] Figure 4 is a radial cross-sectional view of the lens 300. Figure 4 , the second side surface 320 of the lens 300 has only one transition point TP1 within the optical boundary OB. The optical axis area Z1 and the circumferential area Z2 of the second side surface 320 of the lens 300 are as follows: Figure 4 The R value of the second side surface 320 is positive (ie, R>0), so the optical axis area Z1 is a concave surface.

[0096] Generally speaking, the shapes of the areas bounded by the conversion point are opposite to those of the adjacent areas. Therefore, the conversion point can be used to define the transition of the surface shape, that is, from concave to convex or from convex to concave. Figure 4In the figure, since the optical axis area Z1 is a concave surface, the surface shape changes at the transition point TP1, so the circumferential area Z2 is a convex surface.

[0097] Figure 5 is a radial cross-sectional view of the lens 400. Figure 5 , there is a first transition point TP1 and a second transition point TP2 on the first side surface 410 of the lens 400. The area between the optical axis I and the first transition point TP1 is defined as an optical axis region Z1 of the first side surface 410. The R value of the first side surface 410 is positive (ie, R>0), and therefore, the optical axis region Z1 is a convex surface.

[0098] The area between the second transition point TP2 and the optical boundary OB of the first side surface 410 of the lens 400 is defined as a circumferential area Z2, and the circumferential area Z2 of the first side surface 410 is also a convex surface. In addition, the area between the first transition point TP1 and the second transition point TP2 is defined as a relay area Z3, and the relay area Z3 of the first side surface 410 is a concave surface. Figure 5 The first side surface 410 includes, radially outward from the optical axis I, an optical axis region Z1 between the optical axis I and the first conversion point TP1, a relay region Z3 between the first conversion point TP1 and the second conversion point TP2, and a circumferential region Z2 between the second conversion point TP2 and the optical boundary OB of the first side surface 410 of the lens 400. Since the optical axis region Z1 is a convex surface, the surface shape changes from the first conversion point TP1 to a concave surface, so the relay region Z3 is a concave surface, and the surface shape changes from the second conversion point TP2 to a convex surface, so the circumferential region Z2 is a convex surface.

[0099] Figure 6 is a radial cross-sectional view of the lens 500. The first side surface 510 of the lens 500 has no transition point. For a lens surface without a transition point, such as the first side surface 510 of the lens 500, 0 to 50% of the distance from the optical axis I to the optical boundary OB of the lens surface is defined as the optical axis area, and 50 to 100% of the distance from the optical axis I to the optical boundary OB of the lens surface is defined as the circumferential area. Figure 6 The lens 500 shown in the figure defines the optical axis region Z1 of the first side surface 510 as 50% of the distance from the optical axis I to the optical boundary OB on the surface of the lens 500. The R value of the first side surface 510 is positive (i.e., R>0), and therefore, the optical axis region Z1 is a convex surface. Since the first side surface 510 of the lens 500 has no transition point, the circumferential region Z2 of the first side surface 510 is also a convex surface. The lens 500 may further have an assembly portion (not shown) extending radially outward from the circumferential region Z2.

[0100] Figure 7 is a schematic diagram of an optical lens assembly according to a first embodiment of the present invention, and Figure 8 A to Figure 8D is the longitudinal spherical aberration and various aberration diagrams of the optical lens set of the first embodiment. Please refer to Figure 7 The optical lens set 10 of the first embodiment of the present invention includes an aperture O, 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 in sequence along an optical axis I of the optical lens set 10 from the first side A1 to the second side A2. When the optical lens set 10 is used for projection, a plurality of imaging light rays are emitted from the reference surface 100a (i.e., the light emitting surface of the multi-light source generating unit PM) and enter the optical lens set 10. After the plurality of imaging light rays 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 O, a plurality of imaging light rays are generated on the first side A1 and emitted from the optical lens set 10. It is additionally explained that, in the present embodiment, the second side A2 is a side facing the multi-light source generating unit PM, and the first side A1 is the other side opposite thereto; the second side A2 is a light incident side, and the first side A1 is a light emitting side.

[0101] When the optical lens assembly 10 is used for imaging, after the light emitted by an object to be photographed enters the optical lens assembly 10, it will pass through the aperture 0, 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 in sequence, and then form an image on the reference plane 100a. It is additionally explained that in this embodiment, the second side A2 is the side facing the object to be photographed, and the first side A1 is the opposite side, that is, the side facing the reference plane 100a (or image plane); the second side A2 is the object side, and the first side A1 is the image side.

[0102] 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 each have a first side surface 15, 25, 35, 45, 55, 65 facing the first side A1 and allowing imaging light to pass therethrough, and a second side surface 16, 26, 36, 46, 56, 66 facing the second side A2 and allowing imaging light to pass therethrough.

[0103] In this embodiment, 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 are all plastic, but the invention is not limited thereto.

[0104] The first lens 1 has a negative refractive power. The optical axis region 151 of the first side surface 15 of the first lens 1 is a convex surface, and the circumferential region 153 thereof is a convex surface. The optical axis region 162 of the second side surface 16 of the first lens 1 is a concave surface, and the circumferential region 164 thereof is a concave surface. In this embodiment, both the first side surface 15 and the second side surface 16 of the first lens 1 are aspherical surfaces.

[0105] The second lens 2 has a positive refractive power. The optical axis region 251 of the first side surface 25 of the second lens 2 is a convex surface, and the circumferential region 253 thereof is a convex surface. The optical axis region 262 of the second side surface 26 of the second lens 2 is a concave surface, and the circumferential region 263 thereof is a convex surface. In this embodiment, both the first side surface 25 and the second side surface 26 of the second lens 2 are aspherical surfaces.

[0106] The third lens 3 has a positive refractive power. The optical axis region 351 of the first side surface 35 of the third lens 3 is a convex surface, and the circumferential region 354 thereof is a concave surface. The optical axis region 362 of the second side surface 36 of the third lens 3 is a concave surface, and the circumferential region 363 thereof is a convex surface. In this embodiment, both the first side surface 35 and the second side surface 36 of the third lens 3 are aspherical surfaces.

[0107] The fourth lens 4 has a positive refractive power. The optical axis region 451 of the first side surface 45 of the fourth lens 4 is a convex surface, and the circumferential region 454 thereof is a concave surface. The optical axis region 462 of the second side surface 46 of the fourth lens 4 is a concave surface, and the circumferential region 463 thereof is a convex surface. In this embodiment, both the first side surface 45 and the second side surface 46 of the fourth lens 4 are aspherical surfaces.

[0108] The fifth lens 5 has a positive refractive power. The optical axis region 551 of the first side surface 55 of the fifth lens 5 is a convex surface, and the circumferential region 554 thereof is a concave surface. The optical axis region 561 of the second side surface 56 of the fifth lens 5 is a convex surface, and the circumferential region 563 thereof is a convex surface. In this embodiment, both the first side surface 55 and the second side surface 56 of the fifth lens 5 are aspherical surfaces.

[0109] The sixth lens 6 has a positive refractive power. The optical axis region 652 of the first side surface 65 of the sixth lens 6 is a concave surface, and the circumferential region 654 thereof is a concave surface. The optical axis region 661 of the second side surface 66 of the sixth lens 6 is a convex surface, and the circumferential region 663 thereof is a convex surface. In this embodiment, both the first side surface 65 and the second side surface 66 of the sixth lens 6 are aspherical surfaces.

[0110] The optical lens assembly 10 of the first embodiment has good thermal stability. More specifically, the optical lens assembly 10 has a very small focal shift under different ambient temperatures. For example, under a 0°C environment, the focal shift of the optical lens assembly 10 is -0.011 mm; under a 20°C environment, the focal shift of the optical lens assembly 10 is 0.000 mm; and under a 70°C environment, the focal shift of the optical lens assembly 10 is 0.029 mm.

[0111] Other detailed optical data of the first embodiment are as follows Fig. 9As shown, the effective focal length (EFL) of the first embodiment is 2.428 mm, the half field of view (HFOV) is 36.495 degrees, the system length (ie, TTL) is 4.611 mm, the aperture value (f-number, Fno) is 1.518, and the LCR (or image height ImgH) is 2.308 mm. The system length refers to the distance from the first side surface 15 of the first lens 1 to the reference surface 100a on the optical axis I. The "aperture value" in this specification is the aperture value calculated based on the principle of reversibility of light, with aperture 0 regarded as the incident pupil.

[0112] In addition, in this embodiment, the first side surfaces 15, 25, 35, 45, 55, 65 and the second side surfaces 16, 26, 36, 46, 56, 66 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, a total of twelve surfaces, are aspherical surfaces, and these aspherical surfaces are defined according to the following formula (2):

[0113]

[0114] in:

[0115] Y: the distance between the point on the aspheric curve and the optical axis I;

[0116] Z: Depth of the aspherical surface (the vertical distance between the 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 aspherical surface on the optical axis I);

[0117] R: radius of curvature of the lens surface at the near optical axis I;

[0118] K: conic constant;

[0119] a i : i-th order aspheric coefficient.

[0120] The various aspheric coefficients of the above aspheric surfaces in formula (2) are as follows: Fig.10 As shown. Among them, Fig.10 The number 15 in the middle column indicates the aspheric coefficient of the first side surface 15 of the first lens 1 , and the same applies to other columns.

[0121] In addition, the relationship between the important parameters of the optical lens assembly 10 of the first embodiment is as follows: Fig.43 shown.

[0122] in,

[0123] 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; V1 is the Abbe number of the first lens 1, which can also be called the dispersion coefficient; V2 is the Abbe number of the second lens 2; V3 is the Abbe number of the third lens 3; V4 is the Abbe number of the fourth lens 4; V5 is the Abbe number of the fifth lens 5; V6 is the Abbe number of the sixth lens 6;

[0124] 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 the 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 the optical axis I; T6 is the thickness of the sixth lens 6 on the optical axis I;

[0125] G12 is 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 the optical axis I; G56 is the air gap between the fifth lens 5 and the sixth lens 6 on the optical axis I;

[0126] G6P is the air gap between the sixth lens 6 and the reference surface 100a on the optical axis I; D11t22 is the distance from the first side surface 15 of the first lens 1 to the second side surface 26 of the second lens 2 on the optical axis I; D11t32 is the distance L from the first side surface 15 of the first lens 1 to the second side surface 36 of the third lens 3 on the optical axis I; D22t62 is the distance from the second side surface 26 of the second lens 2 to the second side surface 66 of the sixth lens 6 on the optical axis I; D31t51 is the distance from the first side surface 35 of the third lens 3 to the first side surface 55 of the fifth lens 5 on the optical axis I;

[0127] AAG is the sum of the five air gaps of the first lens 1 to the sixth lens 6 on the optical axis I, that is, the sum of G12, G23, G34, G45 and G56; ALT is the sum of the six lens thicknesses of the first lens 1 to the sixth lens 6 on the optical axis I, that is, the sum of T1, T2, T3, T4, T5 and T6; ALT36 is the sum of the four thicknesses of the third lens 3 to the sixth lens 6 on the optical axis I, that is, the sum of T3, T4, T5 and T6; ALT46 is the sum of the thicknesses of the fourth lens 4 to the sixth lens 6 on the optical axis I, i.e., the sum of three thicknesses on T4, T5 and T6; EFL is the effective focal length of the optical lens group 10; BFL is the distance from the second side surface 66 of the sixth lens 6 to the reference surface 100a on the optical axis I, where the reference surface 100a is the light emitting surface or the imaging surface; TTL is the distance from the first side surface 15 of the first lens 1 to the reference surface 100a on the optical axis I, where the reference surface 100a is the light emitting surface or the imaging surface; TL is the distance from the first side surface 15 of the first lens 1 to the second side surface 66 of the sixth lens 6 on the optical axis I; T max is the thickness of the thickest lens of the optical lens group 10 on the optical axis I; T min is the thickness of the thinnest lens of the optical lens group 10 on the optical axis I; T avg is the average thickness of all lenses 1 to 6 of the optical lens group 10 on the optical axis I; HFOV is the half viewing angle of the optical lens group 10, which is the maximum half light output angle ω of the optical lens group 10 according to the principle of reversibility of light; LCR (Light circle radius) is the radius of the light circle (marked as LCR, such as Figure 1 ), is the radius of the minimum circumscribed circle of the light emitting surface (i.e., the reference surface 100a) of the multi-light source generating unit, or when the optical lens group 10 is used for imaging, its value may also be the image height (ImgH) of the optical lens group 10; Fno is the aperture value, which is the aperture value calculated based on the principle of reversibility of light for the effective aperture of the imaging light emitted by the optical lens group 10, and in the embodiment of the present invention, is the aperture value calculated by regarding the aperture 0 as the entrance pupil.

[0128] Fig.43 , Fig.44 In the column from TL to T min The values ​​in that column are in millimeters (mm).

[0129] Also refer to Figure 8 A to Figure 8 D, Figure 8 The diagram A of the first embodiment illustrates the longitudinal spherical aberration on the reference surface 100a when the wavelength is 520nm, 530nm and 540nm. Figure 8 B and Figure 8 The diagrams in FIG. C respectively illustrate the field curvature aberration in the sagittal direction and the field curvature aberration in the tangential direction on the reference plane 100a when the wavelength is 520nm, 530nm and 240nm, respectively. Figure 8 The diagram of D illustrates the distortion aberration of the first embodiment on the reference surface 100a when the wavelength is 520nm, 530nm and 540nm. Figure 8 In A, the curves formed by each wavelength are very close and close to the middle, indicating that the off-axis light rays of different heights of each wavelength are concentrated near the imaging point. It can be seen from the deflection amplitude of the curve of each wavelength that the imaging point deviation of the off-axis light rays of different heights is controlled within the range of ±0.25mm. Therefore, this embodiment does significantly improve the spherical aberration of the same wavelength. In addition, the distances between the three representative wavelengths are also very close to each other, representing that the imaging positions of the light rays of different wavelengths are already very concentrated, thereby significantly improving the chromatic aberration.

[0130] exist Figure 8 B and Figure 8 In the field curvature aberration diagram of C, the focal length variation of the three representative wavelengths in the entire field of view falls within the range of ±0.25 mm, which shows that the optical system of the first embodiment can effectively eliminate aberrations. Figure 8 The distortion diagram of D shows that the distortion amount of the first embodiment falls within the range of ±70%, indicating that the distortion of the first embodiment meets the optical quality requirements of the optical system. This shows that compared with the existing optical lens group, the first embodiment can still provide better optical quality under the condition that the system length has been shortened to about 4.611 mm.

[0131] Fig.11 is a schematic diagram of an optical lens assembly according to a second embodiment of the present invention, and Fig.12 A to Fig.12 D is the longitudinal spherical aberration and various aberration diagrams of the optical lens set of the second embodiment. Fig.11 , a second embodiment of the optical lens assembly 10 of the present invention is substantially similar to the first embodiment, except that the optical data, aspheric coefficients and parameters of the lenses 1, 2, 3, 4, 5, 6 are more or less different. In addition, in this embodiment, the material of the second lens 2 is glass. The sixth lens 6 has a negative refractive power. It should be noted that, in order to clearly show the drawing, Fig.11 Part of the numbers of the optical axis area and the circumferential area having a surface shape similar to that of the first embodiment are omitted.

[0132] The optical lens assembly 10 of the second embodiment has good thermal stability. In other words, the optical lens assembly 10 has a very small focal shift under different ambient temperatures. For example, under a 0°C environment, the focal shift of the optical lens assembly 10 is 0.006 mm; under a 20°C environment, the focal shift of the optical lens assembly 10 is 0.000 mm; under a 70°C environment, the focal shift of the optical lens assembly 10 is -0.015 mm.

[0133] The detailed optical data of the optical lens assembly 10 are as follows: Fig.13 As shown, the effective focal length of the second embodiment is 4.193 mm, the half viewing angle is 36.500 degrees, the system length is 5.123 mm, the aperture value is 2.459, and the LCR (or image height ImgH) is 2.507 mm.

[0134] like Fig.14 As shown, these are the various aspheric coefficients in formula (2) of the second embodiment.

[0135] In addition, the relationship between the important parameters of the optical lens assembly 10 of the second embodiment is as follows: Fig.43 shown.

[0136] Also refer to Fig.12 A to Fig.12 D, Fig.12 The diagram of A illustrates the longitudinal spherical aberration of the second embodiment on the reference surface 100a when the wavelength is 520nm, 530nm and 540nm. Fig.12 B and Fig.12 The diagrams of C respectively illustrate the field curvature aberration in the sagittal direction and the field curvature aberration in the tangential direction on the reference plane 100a when the wavelength is 520nm, 530nm and 540nm. Fig.12 The diagram of D illustrates the distortion aberration of the second embodiment on the reference surface 100a when the wavelength is 520nm, 530nm and 540nm. Fig.12 In A, the imaging point deviation of off-axis light at different heights falls within the range of ±0.009mm. Fig.12 B and Fig.12 In the field curvature aberration diagram of C, the focal length variation of the three representative wavelengths in the entire field of view falls within the range of ±16μm. Fig.12 The distortion diagram of D shows that the distortion of the second embodiment is maintained within the range of ±20%. This shows that the second embodiment can still provide better optical quality compared to the existing optical lens group under the condition that the system length has been shortened to about 5.123 mm.

[0137] It can be seen from the above description that the advantages of the second embodiment over the first embodiment are: the half viewing angle of the second embodiment is larger than that of the first embodiment. The longitudinal spherical aberration of the second embodiment is smaller than that of the first embodiment, and the field curvature aberration of the second embodiment is smaller than that of the first embodiment. The thermal stability of the second embodiment at 0 degrees is better than that of the first embodiment, and the thermal stability of the second embodiment at 70 degrees is better than that of the first embodiment.

[0138] Fig.15 is a schematic diagram of an optical lens assembly according to a third embodiment of the present invention, and Fig.16 A to Fig.16 D is the longitudinal spherical aberration and various aberration diagrams of the optical lens set of the third embodiment. Fig.15 , a third embodiment of the optical lens assembly 10 of the present invention is substantially similar to the first embodiment, except that the optical data, aspheric coefficients and parameters of the lenses 1, 2, 3, 4, 5, 6 are more or less different. In addition, in this embodiment, the sixth lens 6 has a negative refractive power. It should be noted that, in order to clearly show the diagram, Fig.15 Part of the numbers of the optical axis area and the circumferential area having a surface shape similar to that of the first embodiment are omitted.

[0139] The optical lens assembly 10 of the third embodiment has good thermal stability. In other words, the optical lens assembly 10 has a very small focal shift under different ambient temperatures. For example, under a 0°C environment, the focal shift of the optical lens assembly 10 is -0.0105 mm; under a 20°C environment, the focal shift of the optical lens assembly 10 is 0.000 mm; under a 70°C environment, the focal shift of the optical lens assembly 10 is 0.0275 mm.

[0140] The detailed optical data of the optical lens assembly 10 are as follows: Fig.17 As shown, the effective focal length of the third embodiment is 3.354 mm, the half viewing angle is 36.500 degrees, the system length is 4.263 mm, the aperture value is 1.677, and the LCR (or image height ImgH) is 2.113 mm.

[0141] like Fig.18 As shown, these are the various aspheric coefficients in formula (2) of the third embodiment.

[0142] In addition, the relationship between the important parameters of the optical lens assembly 10 of the third embodiment is as follows: Fig.43 shown.

[0143] Also refer to Fig.16 A to Fig.16 D, Fig.16The diagram of A of the third embodiment illustrates the longitudinal spherical aberration on the reference surface 100a when the wavelength is 520nm, 530nm and 540nm. Fig.16 B and Fig.16 The diagrams of C respectively illustrate the field curvature aberration in the sagittal direction and the field curvature aberration in the tangential direction on the reference plane 100a when the wavelength is 520nm, 530nm and 540nm. Fig.16 The diagram of D illustrates the distortion aberration of the third embodiment on the reference surface 100a when the wavelength is 520nm, 530nm and 540nm. Fig.16 In A, the imaging point deviation of off-axis light at different heights falls within the range of ±0.015mm. Fig.16 B and Fig.16 In the field curvature aberration diagram of C, the focal length variation of the three representative wavelengths in the entire field of view falls within the range of ±27μm. Fig.16 The distortion diagram of D shows that the distortion of the third embodiment is maintained within the range of ±15%. This shows that the third embodiment can still provide better optical quality compared to the existing optical lens group under the condition that the system length has been shortened to about 4.263 mm.

[0144] It can be seen from the above description that the advantages of the third embodiment over the first embodiment are: the system length of the third embodiment is shorter than the system length of the first embodiment. The half viewing angle of the third embodiment is larger than the half viewing angle of the first embodiment. The longitudinal spherical aberration of the third embodiment is smaller than that of the first embodiment, the field curvature aberration of the third embodiment is smaller than that of the first embodiment, and the thermal stability of the third embodiment at 0 degrees is better than that of the first embodiment.

[0145] Fig.19 is a schematic diagram of an optical lens assembly according to a fourth embodiment of the present invention, and Fig. 20 A to Fig. 20 D is the longitudinal spherical aberration and various aberration diagrams of the optical lens set of the fourth embodiment. Please refer to Fig.19 , a fourth embodiment of the optical lens group 10 of the present invention is substantially similar to the first embodiment, with only the optical data, aspheric coefficients and parameters of these lenses 1, 2, 3, 4, 5, 6 being more or less different. In addition, in this embodiment, the circumferential area 264 of the second side surface 26 of the second lens 2 is a concave surface, the circumferential area 353 of the first side surface 35 of the third lens 3 is a convex surface, and the circumferential area 364 of the second side surface 36 of the third lens 3 is a concave surface. The optical axis area 562 of the second side surface 56 of the fifth lens 5 is a concave surface. The sixth lens 6 has a negative refractive power. It should be noted here that in order to clearly display the drawings, Fig.19 Part of the numbers of the optical axis area and the circumferential area having a surface shape similar to that of the first embodiment are omitted.

[0146] The optical lens assembly 10 of the fourth embodiment has good thermal stability. In other words, the optical lens assembly 10 has a very small focal shift under different ambient temperatures. For example, under a 0°C environment, the focal shift of the optical lens assembly 10 is -0.011 mm; under a 20°C environment, the focal shift of the optical lens assembly 10 is 0.000 mm; under a 70°C environment, the focal shift of the optical lens assembly 10 is 0.029 mm.

[0147] The detailed optical data of the optical lens assembly 10 are as follows: Fig.21 As shown, the effective focal length of the fourth embodiment is 3.405 mm, the half viewing angle is 36.492 degrees, the system length is 4.088 mm, the aperture value is 1.703, and the LCR (or image height ImgH) is 2.140 mm.

[0148] like Fig. 22 As shown, these are the various aspheric coefficients in formula (2) of the fourth embodiment.

[0149] In addition, the relationship between the important parameters of the optical lens assembly 10 of the fourth embodiment is as follows: Fig.43 shown.

[0150] Also refer to Fig. 20 A to Fig. 20 D, Fig. 20 The diagram of A of the fourth embodiment illustrates the longitudinal spherical aberration on the reference surface 100a when the wavelength is 520nm, 530nm and 540nm. Fig. 20 B and Fig. 20 The diagrams of C respectively illustrate the field curvature aberration in the sagittal direction and the field curvature aberration in the tangential direction on the reference plane 100a of the fourth embodiment when the wavelength is 520nm, 530nm and 540nm. Fig. 20 The diagram of D illustrates the distortion aberration of the fourth embodiment on the reference surface 100a when the wavelength is 520nm, 530nm and 540nm. Fig. 20 In A, the imaging point deviation of off-axis light at different heights is controlled to fall within the range of ±0.023mm. Fig. 20 B and Fig. 20 In the field curvature aberration diagram of C, the focal length variation of the three representative wavelengths in the entire field of view falls within the range of ±34μm. Fig. 20 The distortion diagram of D shows that the distortion of the fourth embodiment is maintained within the range of ±15%. This shows that the fourth embodiment can still provide better optical quality compared to the existing optical lens group under the condition that the system length has been shortened to about 4.088 mm.

[0151] It can be seen from the above description that the advantages of the fourth embodiment over the first embodiment are: the system length of the fourth embodiment is shorter than the system length of the first embodiment. The longitudinal spherical aberration of the fourth embodiment is smaller than that of the first embodiment, and the field curvature aberration of the fourth embodiment is smaller than that of the first embodiment.

[0152] Fig.23 is a schematic diagram of an optical lens assembly according to a fifth embodiment of the present invention, and Fig.24 A to Fig.24 D is the longitudinal spherical aberration and various aberration diagrams of the optical lens set of the fifth embodiment. Fig.23 , a fifth embodiment of the optical lens assembly 10 of the present invention is substantially similar to the first embodiment, except that the optical data, aspheric coefficients and parameters of the lenses 1, 2, 3, 4, 5, and 6 are more or less different. In addition, in this embodiment, the optical axis region 562 of the second side surface 56 of the fifth lens 5 is a concave surface. The sixth lens 6 has a negative refractive power. It should be noted that, in order to clearly show the drawing, Fig.23 Part of the numbers of the optical axis area and the circumferential area having a surface shape similar to that of the first embodiment are omitted.

[0153] The optical lens assembly 10 of the fifth embodiment has good thermal stability. In other words, the optical lens assembly 10 has a very small focal shift under different ambient temperatures. For example, under a 0°C environment, the focal shift of the optical lens assembly 10 is -0.011 mm; under a 20°C environment, the focal shift of the optical lens assembly 10 is 0.000 mm; under a 70°C environment, the focal shift of the optical lens assembly 10 is 0.029 mm.

[0154] The detailed optical data of the optical lens assembly 10 are as follows: Fig.25 As shown, the effective focal length of the fifth embodiment is 3.507 mm, the half viewing angle is 36.500 degrees, the system length is 4.323 mm, the aperture value is 1.754, and the LCR (or image height ImgH) is 2.233 mm.

[0155] like Fig.26 As shown, these are the various aspheric coefficients in formula (2) of the fifth embodiment.

[0156] In addition, the relationship between the important parameters of the optical lens assembly 10 of the fifth embodiment is as follows: Fig.43 shown.

[0157] Also refer to Fig.24 A to Fig.24 D, Fig.24The diagram of A illustrates the longitudinal spherical aberration of the fifth embodiment on the reference surface 100a when the wavelength is 520nm, 530nm and 540nm. Fig.24 B and Fig.24 The diagrams of C respectively illustrate the field curvature aberration in the sagittal direction and the field curvature aberration in the tangential direction on the reference surface 100a when the wavelength is 520nm, 530nm and 540nm. Fig.24 The diagram of D illustrates the distortion aberration of the fifth embodiment on the reference surface 100a when the wavelength is 520nm, 530nm and 540nm. Fig.24 In A, the imaging point deviation of off-axis light at different heights falls within the range of ±0.016mm. Fig.24 B and Fig.24 In the field curvature aberration diagram of C, the focal length variation of the three representative wavelengths within the entire field of view falls within the range of ±30μm. Fig.24 The distortion diagram of D shows that the distortion of the fifth embodiment is maintained within the range of ±14%. This shows that the fifth embodiment can still provide better imaging quality compared to the existing optical lens group under the condition that the system length has been shortened to about 4.323 mm.

[0158] It can be seen from the above description that the advantages of the fifth embodiment over the first embodiment are: the system length of the fifth embodiment is shorter than the system length of the first embodiment. The half viewing angle of the fifth embodiment is larger than that of the first embodiment. The longitudinal spherical aberration of the fifth embodiment is smaller than that of the first embodiment, and the field curvature aberration of the fifth embodiment is smaller than that of the first embodiment.

[0159] Fig. 27 is a schematic diagram of an optical lens assembly according to a sixth embodiment of the present invention, and Fig.28 A to Fig.28 D is a diagram of the longitudinal spherical aberration and various aberrations of the optical lens assembly of the sixth embodiment. Fig. 27 , a sixth embodiment of the optical lens group 10 of the present invention is substantially similar to the first embodiment, with only the optical data, aspheric coefficients and parameters of these lenses 1, 2, 3, 4, 5, 6 being more or less different. In addition, in this embodiment, the circumferential region 264 of the second side surface 26 of the second lens 2 is a concave surface. The third lens 3 has a negative refractive power, the circumferential region 353 of the first side surface 35 of the third lens 3 is a convex surface, and the circumferential region 364 of the second side surface 36 of the third lens 3 is a concave surface. The optical axis region 562 of the second side surface 56 of the fifth lens 5 is a concave surface. The sixth lens 6 has a negative refractive power. It should be noted here that in order to clearly display the drawings, Fig. 27 Part of the numbers of the optical axis area and the circumferential area having a surface shape similar to that of the first embodiment are omitted.

[0160] The optical lens assembly 10 of the sixth embodiment has good thermal stability. In other words, the optical lens assembly 10 has a very small focal shift under different ambient temperatures. For example, under a 0°C environment, the focal shift of the optical lens assembly 10 is -0.01 mm; under a 20°C environment, the focal shift of the optical lens assembly 10 is 0.000 mm; under a 70°C environment, the focal shift of the optical lens assembly 10 is 0.025 mm.

[0161] The detailed optical data of the optical lens assembly 10 are as follows: Fig.29 As shown, the effective focal length of the sixth embodiment is 2.905 mm, the half viewing angle is 36.500 degrees, the system length is 3.430 mm, the aperture value is 1.453, and the LCR (or image height ImgH) is 1.843 mm.

[0162] like Fig.30 As shown, these are the various aspheric coefficients in formula (2) of the sixth embodiment.

[0163] In addition, the relationship between the important parameters of the optical lens assembly 10 of the sixth embodiment is as follows: Fig.44 shown.

[0164] Also refer to Fig.28 A to Fig.28 D, Fig.28 The diagram of A illustrates the longitudinal spherical aberration of the sixth embodiment on the reference surface 100a when the wavelength is 520nm, 530nm and 540nm. Fig.28 B and Fig.28 The diagrams of C respectively illustrate the field curvature aberration in the sagittal direction and the field curvature aberration in the tangential direction on the reference surface 100a of the sixth embodiment when the wavelength is 520nm, 530nm and 540nm. Fig.28 The diagram of D illustrates the distortion aberration of the sixth embodiment on the reference surface 100a when the wavelength is 520nm, 530nm and 540nm. Fig.28 In A, the imaging point deviation of off-axis light at different heights falls within the range of ±0.08mm. Fig.28 B and Fig.28 In the field curvature aberration diagram of C, the focal length variation of the three representative wavelengths in the entire field of view falls within the range of ±0.08mm. Fig.28 The distortion diagram of D shows that the distortion of the sixth embodiment is maintained within the range of ±11%. This shows that the sixth embodiment can still provide better optical quality compared to the existing optical lens group under the condition that the system length has been shortened to about 3.430 mm.

[0165] It can be known from the above description that the advantages of the sixth embodiment over the first embodiment are: the system length of the sixth embodiment is shorter than the system length of the first embodiment. The half viewing angle of the sixth embodiment is larger than that of the first embodiment. The aperture value of the sixth embodiment is smaller than that of the first embodiment. The longitudinal spherical aberration of the sixth embodiment is smaller than that of the first embodiment, the field curvature aberration of the sixth embodiment is smaller than that of the first embodiment, the thermal stability of the sixth embodiment at 0 degrees is better than that of the first embodiment, and the thermal stability of the sixth embodiment at 70 degrees is better than that of the first embodiment.

[0166] Fig.31 is a schematic diagram of an optical lens assembly according to a seventh embodiment of the present invention, and Fig.32 A to Fig.32 D is the longitudinal spherical aberration and various aberration diagrams of the optical lens set of the seventh embodiment. Fig.31 , a seventh embodiment of the optical lens group 10 of the present invention is substantially similar to the first embodiment, except that the optical data, aspheric coefficients and parameters of the lenses 1, 2, 3, 4, 5, and 6 are more or less different. In addition, in this embodiment, the material of the second lens 2 is glass. The circumferential region 264 of the second side surface 26 of the second lens 2 is a concave surface. The circumferential region 353 of the first side surface 35 of the third lens 3 is a convex surface. The fifth lens 5 has a negative refractive power, and the optical axis region 562 of the second side surface 56 of the fifth lens 5 is a concave surface. It should be noted here that in order to clearly display the drawings, Fig.31 Part of the numbers of the optical axis area and the circumferential area having a surface shape similar to that of the first embodiment are omitted.

[0167] The optical lens assembly 10 of the seventh embodiment has good thermal stability. In other words, the optical lens assembly 10 has a very small focal shift under different ambient temperatures. For example, under a 0°C environment, the focal shift of the optical lens assembly 10 is 0.0035 mm; under a 20°C environment, the focal shift of the optical lens assembly 10 is 0.000 mm; under a 70°C environment, the focal shift of the optical lens assembly 10 is -0.009 mm.

[0168] The detailed optical data of the optical lens assembly 10 are as follows: Fig.33 As shown, the effective focal length of the seventh embodiment is 2.854 mm, the half viewing angle is 36.479 degrees, the system length is 4.197 mm, the aperture value is 1.427, and the LCR (or image height ImgH) is 2.140 mm.

[0169] like Fig.34 As shown, these are the various aspheric coefficients in formula (2) of the seventh embodiment.

[0170] In addition, the relationship between the important parameters of the optical lens assembly 10 of the seventh embodiment is as follows: Fig.44 shown.

[0171] Also refer to Fig.32 A to Fig.32 D, Fig.32 The diagram of A of the seventh embodiment illustrates the longitudinal spherical aberration on the reference surface 100a when the wavelength is 520nm, 530nm and 540nm. Fig.32 B and Fig.32 The diagrams of C respectively illustrate the field curvature aberration in the sagittal direction and the field curvature aberration in the tangential direction on the reference surface 100a of the seventh embodiment when the wavelength is 520nm, 530nm and 540nm. Fig.32 The diagram of D illustrates the distortion aberration of the seventh embodiment on the reference surface 100a when the wavelength is 520nm, 530nm and 540nm. Fig.32 In A, the imaging point deviation of off-axis light at different heights falls within the range of ±0.012mm. Fig.32 B and Fig.32 In the field curvature aberration diagram of C, the focal length variation of the three representative wavelengths in the entire field of view falls within the range of ±22μm. Fig.32 The distortion diagram of D shows that the distortion of the seventh embodiment is maintained within the range of ±13%. This shows that the seventh embodiment can still provide better optical quality compared to the existing optical lens group under the condition that the system length has been shortened to about 4.197 mm.

[0172] It can be seen from the above description that the advantages of the seventh embodiment over the first embodiment are: the system length of the seventh embodiment is shorter than the system length of the first embodiment. The aperture value of the seventh embodiment is smaller than the aperture value of the first embodiment. The longitudinal spherical aberration of the seventh embodiment is smaller than the longitudinal spherical aberration of the first embodiment, and the field curvature aberration of the seventh embodiment is smaller than the field curvature aberration of the first embodiment. The thermal stability of the seventh embodiment at 0 degrees is better than that of the first embodiment, and the thermal stability of the seventh embodiment at 70 degrees is better than that of the first embodiment.

[0173] Fig.35 is a schematic diagram of an optical lens assembly according to an eighth embodiment of the present invention, and Fig.36 A to Fig.36 D is the longitudinal spherical aberration and various aberration diagrams of the optical lens set of the eighth embodiment. Fig.35, an eighth embodiment of the optical lens group 10 of the present invention is substantially similar to the first embodiment, except that the optical data, aspheric coefficients and parameters of the lenses 1, 2, 3, 4, 5, and 6 are more or less different. In addition, in this embodiment, the material of the second lens 2 is glass. The circumferential area 264 of the second side surface 26 of the second lens 2 is a concave surface. The optical axis area 562 of the second side surface 56 of the fifth lens 5 is a concave surface. The sixth lens 6 has a negative refractive power. It should be noted here that in order to clearly show the drawing, Fig.35 Part of the numbers of the optical axis area and the circumferential area having a surface shape similar to that of the first embodiment are omitted.

[0174] The optical lens assembly 10 of the eighth embodiment has good thermal stability. More specifically, the optical lens assembly 10 has a very small focal shift under different ambient temperatures. For example, under a 0°C environment, the focal shift of the optical lens assembly 10 is 0.0035 mm; under a 20°C environment, the focal shift of the optical lens assembly 10 is 0.000 mm; and under a 70°C environment, the focal shift of the optical lens assembly 10 is -0.009 mm.

[0175] The detailed optical data of the optical lens assembly 10 are as follows: Fig.33 As shown, the effective focal length of the eighth embodiment is 4.024 mm, the half viewing angle is 30.348 degrees, the system length is 4.468 mm, the aperture value is 2.012, and the LCR (or image height ImgH) is 1.926 mm.

[0176] like Fig.38 As shown, these are the various aspheric coefficients in formula (2) of the eighth embodiment.

[0177] In addition, the relationship between the important parameters of the optical lens assembly 10 of the eighth embodiment is as follows: Fig.44 shown.

[0178] Also refer to Fig.36 A to Fig.36 D, Fig.36 The diagram of A shows the longitudinal spherical aberration of the eighth embodiment on the reference surface 100a when the wavelength is 520nm, 530nm and 540nm. Fig.36 B and Fig.36 The diagrams of C respectively illustrate the field curvature aberration in the sagittal direction and the field curvature aberration in the tangential direction on the reference surface 100a of the eighth embodiment when the wavelength is 520nm, 530nm and 540nm. Fig.36 The diagram of D illustrates the distortion aberration of the eighth embodiment on the reference surface 100a when the wavelength is 520nm, 530nm and 540nm. Fig.36In A, the imaging point deviation of off-axis light at different heights falls within the range of ±0.045mm. Fig.36 In the field curvature aberration diagrams of B and C, the focal length variation of the three representative wavelengths within the entire field of view falls within the range of ±45μm. Fig.36 The distortion diagram of D shows that the distortion of the eighth embodiment is maintained within the range of ±17%. This shows that the eighth embodiment can still provide better imaging quality compared to the existing optical lens group under the condition that the system length has been shortened to about 4.468 mm.

[0179] It can be seen from the above description that the advantages of the eighth embodiment over the first embodiment are: the system length of the eighth embodiment is shorter than that of the first embodiment. The longitudinal spherical aberration of the eighth embodiment is smaller than that of the first embodiment, the field curvature aberration of the eighth embodiment is smaller than that of the first embodiment, the thermal stability of the eighth embodiment at 0 degrees is better than that of the first embodiment, and the thermal stability of the eighth embodiment at 70 degrees is better than that of the first embodiment.

[0180] Fig.39 is a schematic diagram of an optical lens assembly according to a ninth embodiment of the present invention, and Fig.40 A to Fig.40 D is the longitudinal spherical aberration and various aberration diagrams of the optical lens set of the ninth embodiment. Fig.35 , a ninth embodiment of the optical lens group 10 of the present invention is substantially similar to the first embodiment, with only the optical data, aspheric coefficients and parameters of these lenses 1, 2, 3, 4, 5, 6 being more or less different. In addition, in this embodiment, the material of the second lens 2 is glass. The circumferential region 264 of the second side surface 26 of the second lens 2 is a concave surface. The circumferential region 353 of the first side surface 35 of the third lens 3 is a convex surface. The fifth lens 5 has a negative refractive power. The optical axis region 552 of the first side surface 55 of the fifth lens 5 is a concave surface. The sixth lens 6 has a negative refractive power. The optical axis region 622 of the second side surface 62 of the sixth lens 6 is a concave surface. It should be noted here that in order to clearly display the drawings, Fig.39 Part of the numbers of the optical axis area and the circumferential area having a surface shape similar to that of the first embodiment are omitted.

[0181] The optical lens assembly 10 of the ninth embodiment has good thermal stability. In other words, the optical lens assembly 10 has a very small focal shift under different ambient temperatures. For example, under a 0°C environment, the focal shift of the optical lens assembly 10 is 0.005 mm; under a 20°C environment, the focal shift of the optical lens assembly 10 is 0.000 mm; under a 70°C environment, the focal shift of the optical lens assembly 10 is -0.012 mm.

[0182] The detailed optical data of the optical lens assembly 10 are as follows: Fig.41 As shown, the effective focal length of the ninth embodiment is 3.418 mm, the half viewing angle is 36.307 degrees, the system length is 4.281 mm, the aperture value is 1.709, and the LCR (or image height ImgH) is 2.140 mm.

[0183] like Fig.42 As shown, these are the various aspheric coefficients in formula (2) of the ninth embodiment.

[0184] In addition, the relationship between the important parameters of the optical lens assembly 10 of the ninth embodiment is as follows: Fig.44 shown.

[0185] Also refer to Fig.40 A to Fig.40 D, Fig.40 The diagram of A of the ninth embodiment illustrates the longitudinal spherical aberration on the reference surface 100a when the wavelength is 520nm, 530nm and 540nm. Fig.40 B and Fig.40 The diagrams of C respectively illustrate the field curvature aberration in the sagittal direction and the field curvature aberration in the tangential direction on the reference surface 100a of the ninth embodiment when the wavelength is 520nm, 530nm and 540nm. Fig.40 The diagram of D illustrates the distortion aberration of the ninth embodiment on the reference surface 100a when the wavelength is 520nm, 530nm and 540nm. Fig.40 In A, the imaging point deviation of off-axis light at different heights falls within the range of ±0.025mm. Fig.40 B and Fig.40 In the field curvature aberration diagram of C, the focal length variation of the three representative wavelengths within the entire field of view falls within the range of ±35μm. Fig.40 The distortion diagram of D shows that the distortion of the ninth embodiment is maintained within the range of ±10%. This shows that the ninth embodiment can still provide better optical quality compared to the existing optical lens set under the condition that the system length has been shortened to about 4.281 mm.

[0186] From the above description, it can be known that the advantages of the ninth embodiment compared with the first embodiment are: the longitudinal spherical aberration of the ninth embodiment is smaller than that of the first embodiment, the field curvature aberration of the ninth embodiment is smaller than that of the first embodiment, the thermal stability of the ninth embodiment at 0 degrees is better than that of the first embodiment, and the thermal stability of the ninth embodiment at 70 degrees is better than that of the first embodiment.

[0187] Also refer to Fig.43 and Fig.44, which is a table diagram of various optical parameters of the above nine embodiments. When the relationship between various optical parameters of the optical lens set 10 of the embodiment of the present invention meets at least one of the following conditional expressions, it can help designers design an optical lens set with good optical performance and technically feasible:

[0188] The optical lens assembly 10 of the embodiment of the present invention further satisfies the following conditional expressions, which helps to maintain the effective focal length and each optical parameter at an appropriate value, and avoids any parameter being too large and thus detrimental to the correction of the aberration of the entire optical lens assembly 10, or avoids any parameter being too small and thus affecting assembly or increasing the difficulty of manufacturing.

[0189] in,

[0190] The optical lens assembly 10 further satisfies the conditional expression of TTL / EFL≦1.900, wherein a preferred range is the conditional expression of 1.000≦TTL / EFL≦1.900.

[0191] The optical lens assembly 10 further satisfies the conditional expression of TL*Fno / EFL≦3.000, wherein a preferred range is 1.350≦TL*Fno / EFL≦3.000.

[0192] The optical lens assembly 10 of the embodiment of the present invention further satisfies the following conditional expressions, which helps to maintain the thickness and spacing of each lens at an appropriate value, and avoids any parameter being too large and thus detrimental to the overall thinning of the optical lens assembly, or any parameter being too small and thus affecting assembly or increasing the difficulty of manufacturing.

[0193] in,

[0194] The optical lens assembly 10 further satisfies the conditional expression of TTL*Fno / D22t62≦3.400, wherein the preferred range is 2.000≦TTL*Fno / D22t62≦3.400;

[0195] Optical lens group 10 further satisfies: 1.500≦T2 / T avg The optimal range is 1.500≦T2 / T avg ≦2.200 conditional expression;

[0196] The optical lens assembly 10 further satisfies the conditional expression of TTL / AAG≦3.500, wherein the preferred range is the conditional expression of 1.800≦TTL / AAG≦3.500;

[0197] The optical lens assembly 10 further satisfies the conditional expression of TL / (G23+G34+G45+G56)≦3.700, wherein the preferred range is 1.700≦TL / (G23+G34+G45+G56)≦3.700;

[0198] The optical lens assembly 10 further satisfies the conditional expression of ALT / (T1+T2)≦3.000, wherein the preferred range is the conditional expression of 1.900≦ALT / (T1+T2)≦3.000;

[0199] The optical lens assembly 10 further satisfies the conditional expression of D11t32 / (G34+G56)≦3.800, wherein the preferred range is 1.000≦D11t32 / (G34+G56)≦3.800;

[0200] The optical lens assembly 10 further satisfies the conditional expression of ALT36 / (G45+G56)≦2.500, wherein the preferred range is 0.900≦ALT36 / (G45+G56)≦2.500;

[0201] The optical lens assembly 10 further satisfies the conditional expression of D11t32 / (G34+G45)≦5.100, wherein the preferred range is 1.900≦D11t32 / (G34+G45)≦5.100;

[0202] The optical lens assembly 10 further satisfies the conditional expression of (ALT+BFL) / D31t51≦3.100, wherein the preferred range is 1.600≦(ALT+BFL) / D31t51≦3.100;

[0203] The optical lens assembly 10 further satisfies: (T max +T min ) / G34≦6.000, the optimal range is 1.600≦(T max +T min ) / G34≦6.000 conditional expression;

[0204] The optical lens assembly 10 further satisfies the conditional expression of ALT46 / T3≦3.100, wherein the preferred range is the conditional expression of 1.200≦ALT46 / T3≦3.100;

[0205] The optical lens assembly 10 further satisfies the conditional expression of (T1+G12+T2) / G23≦6.800, wherein the preferred range is 1.600≦(T1+G12+T2) / G23≦6.800;

[0206] The optical lens assembly 10 further satisfies the conditional expression of ALT / (T2+T3)≦2.600, wherein the preferred range is the conditional expression of 1.700≦ALT / (T2+T3)≦2.600;

[0207] The optical lens assembly 10 further satisfies the conditional expression of TTL / D31t51≦4.000, wherein the preferred range is the conditional expression of 2.500≦TTL / D31t51≦4.000;

[0208] The optical lens assembly 10 further satisfies: (D11t22+BFL) / T max ≦2.800, the best range is 1.300≦(D11t22+BFL) / T max ≦2.800 conditional expression.

[0209] In view of the unpredictability of optical system design, under the framework of the present invention, meeting the above conditions can better shorten the length of the system of the present invention, increase the available aperture, improve the optical quality, or improve the assembly yield, thereby improving the shortcomings of the prior art.

[0210] The exemplary limiting relationships listed above can also be arbitrarily and selectively combined in different quantities and applied to the implementation of the present invention, and are not limited thereto. When implementing the present invention, in addition to the aforementioned relationships, other detailed structures such as the arrangement of concave and convex surfaces of other lenses can also be designed for a single lens or for multiple lenses in a broad sense to enhance the control of system performance and / or resolution. It should be noted that these details need to be selectively combined and applied to other embodiments of the present invention without conflict.

[0211] The numerical ranges obtained by the combination ratio relationship of the optical parameters disclosed in each embodiment of the present invention, including the maximum and minimum values, can be implemented accordingly.

[0212] In summary, the optical lens assembly 10 of the embodiment of the present invention can achieve the following effects and advantages:

[0213] 1. The longitudinal spherical aberration, field curvature aberration, and distortion of each embodiment of the present invention all meet the use specifications. In addition, the off-axis light rays of the three representative wavelengths of 520nm, 530nm, and 540nm at different heights are all concentrated near the imaging point. From the deflection amplitude of each curve, it can be seen that the imaging point deviations of the off-axis light rays at different heights are all controlled and have good spherical aberration, aberration, and distortion suppression capabilities. Further referring to the imaging quality data, the distances between the three representative wavelengths of 520nm, 530nm, and 540nm are also quite close to each other, indicating that the present invention has good concentration of light rays of different wavelengths under various conditions and has excellent dispersion suppression capabilities. In summary, the present invention can produce excellent imaging quality through the design and mutual matching of the lenses.

[0214] 2. In the optical lens set 10 of the embodiment of the present invention, the aperture 0 is arranged in front of the first lens 1, the first lens 1 has a negative refractive power and satisfies the conditional formula of EFL*Fno / D11t22≦11.500, and is matched with the following surface shape and refractive power combinations a to c:

[0215] a. The optical axis region 462 of the second side surface 46 of the fourth lens 4 is a concave surface.

[0216] b. The optical axis region 151 of the first side surface 15 of the first lens 1 is a convex surface, the second lens 2 has a positive refractive power, and the optical axis region 451 of the first side surface 45 of the fourth lens 4 is a convex surface.

[0217] c. The second lens 2 has a positive refractive power, the optical axis region 451 of the first side surface 45 of the fourth lens 4 is a convex surface, and the circumferential region of the second side surface of the sixth lens is a convex surface.

[0218] Such a design is conducive to providing an optical lens assembly with small size, large aperture, high thermal stability and simultaneous application to light sources of different wavelength bands, wherein the preferred limit of the above conditional expression is EFL*Fno / D11t22≦8.100, and the best limit is 4.300≦EFL*Fno / D11t22≦8.100.

[0219] 3. In the optical lens set 10 of the embodiment of the present invention, the aperture 0 of the optical lens set 10 is arranged in front of the first lens 1, and the first lens 1 has a negative refractive power and satisfies the condition EFL*Fno / D11t22≦8.100, and is matched with the following surface shape and refractive power combination:

[0220] d. The optical axis region 562 of the second side surface 56 of the fifth lens 5 is a concave surface.

[0221] e. The second lens element 2 has a positive refractive power, and the optical axis region 551 of the first side surface 55 of the fifth lens element 5 is a convex surface.

[0222] Such a design is conducive to providing an optical lens assembly with a small size, a large aperture, high thermal stability and simultaneous application to light sources of different wavelength bands, wherein the above conditional expression is preferably limited to 4.300≦EFL*Fno / D11t22≦8.100.

[0223] Fourth, in the optical lens assembly 10 of the embodiment of the present invention, further satisfying the condition of V1+V2+V6≦120.000 is beneficial to correcting the chromatic aberration of the optical lens assembly 10, and the preferred limit is 90.000≦V1+V2+V6≦120.000.

[0224] 5. In the optical lens set 10 of the embodiment of the present invention, the aperture O is arranged in front of the first lens L1, the optical axis region 262 of the second side surface 26 of the second lens 2 is a concave surface, and the optical axis region 562 of the second side surface 56 of the fifth lens 5 is a concave surface, and the following conditional formula is satisfied: T2 / T avg ≧1.500, and further with any one of the following conditions: the first lens 1 has a negative refractive power, the third lens 3 has a positive refractive power, the circumferential area 452 of the first side surface 45 of the fourth lens 4 is a concave surface, the optical axis area 462 of the second side surface 46 of the fourth lens 4 is a concave surface, the fifth lens 5 has a positive refractive power, the optical axis area 551 of the first side surface 55 of the fifth lens 5 is a convex surface, the sixth lens 6 has a negative refractive power, the optical axis area 652 of the first side surface 65 of the sixth lens 6 is a concave surface, the circumferential area 654 of the first side surface 65 of the sixth lens 6 is a concave surface, or the optical axis area 661 of the second side surface 66 of the sixth lens 6 is a convex surface. Such a design is conducive to providing an optical lens assembly 10 with a small size, a large aperture, high thermal stability, and simultaneous application to light sources of different wavelength bands.

[0225] 6. In the optical lens assembly 10 of the embodiment of the present invention, the first lens 1 has a negative refractive power, the optical axis region 151 of the first side surface 15 of the first lens 1 is a convex surface, the second lens 2 has a positive refractive power, the optical axis region 262 of the second side surface 26 of the second lens 2 is a concave surface, the third lens 3 has a positive refractive power, the optical axis region 562 of the second side surface 56 of the fifth lens 5 is a concave surface, and the following conditional expression is satisfied: TTL*Fno / D22t62≦3.400, and any one of the following conditions is further matched: the optical axis region 451 of the first side surface 45 of the fourth lens 4 is a convex surface, the optical axis region 462 of the second side surface 46 of the fourth lens 4 is a concave surface, the sixth lens 6 has a negative refractive power, the optical axis region 652 of the first side surface 65 of the sixth lens 6 is a concave surface, or the optical axis region 661 of the second side surface 66 of the sixth lens 6 is a convex surface, which is conducive to providing an optical lens assembly 10 with a small size, a large aperture, high thermal stability, and simultaneous application to light sources of different wavelength bands.

[0226] 7. In the optical lens assembly 10 of the embodiment of the present invention, the absolute value of the focal length offset at a temperature of 0°C to 70°C is less than or equal to 0.030 mm, so it is suitable for different ambient temperatures and avoids the problem of unclear information or image recognition due to the influence of ambient temperature.

[0227] Although the present invention has been disclosed as above by way of embodiments, it is not intended to limit the present invention. Any person having ordinary knowledge in the technical field may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the scope of the attached patent application.

Claims

1. An optical lens assembly, comprising, from a first side to a second side along an optical axis, an aperture, a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, in sequence, wherein the first side is a light exit side or an object side, the second side is a light entrance side or an image side, and each of the first to sixth lenses comprises a first side surface facing the first side and allowing imaging light to pass through, and a second side surface facing the second side and allowing imaging light to pass through; The first lens has a negative refractive power, an optical axis region of the first side surface of the first lens is a convex surface, a circumferential region of the first side surface of the first lens is a convex surface, an optical axis region of the second side surface of the first lens is a concave surface, and a circumferential region of the second side surface of the first lens is a concave surface; The second lens has a positive refractive power, an optical axis region of the first side surface of the second lens is a convex surface, a circumferential region of the first side surface of the second lens is a convex surface, and an optical axis region of the second side surface of the second lens is a concave surface; An optical axis region of the first side surface of the third lens is a convex surface, and an optical axis region of the second side surface of the third lens is a concave surface; The fourth lens has a positive refractive power, an optical axis region of the second side surface of the fourth lens is a concave surface, an optical axis region of the first side surface of the fourth lens is a convex surface, a circumferential region of the first side surface of the fourth lens is a concave surface, and a circumferential region of the second side surface of the fourth lens is a convex surface; A circumferential area of ​​the first side surface of the fifth lens is a concave surface, and a circumferential area of ​​the second side surface of the fifth lens is a convex surface; An optical axis region of the first side surface of the sixth lens is a concave surface, a circumferential region of the first side surface of the sixth lens is a concave surface, and a circumferential region of the second side surface of the sixth lens is a convex surface; The lenses of the optical lens group are composed of the above six lenses and meet the following conditional formula: 90.000≦V1+V2+V6≦120.000; 4.300≦EFL*Fno / D 11t 22≦8.100; 1.200≦ALT46 / T3≦3.100; 1.000≦TTL / EFL≦1.900; 1.350≦TL*Fno / EFL≦3.000; 2.000≦TTL*Fno / D22t62≦3.400; 1.500≦T2 / Tavg≦2.200; 1.800≦TTL / AAG≦3.500; 1.700≦TL / (G23+G34+G45+G56)≦3.700; 1.900≦ALT / (T 1+T2)≦3.000; 1.000≦D 11t 32 / (G34+G56)≦3.800; 0.900≦ALT36 / (G45+G56)≦2.500; 1.900≦D 11t 32 / (G34+G45)≦5.100; 1.600≦(ALT+BFL) / D31 t 51≦3.100; 1.600≦(Tmax+Tmin) / G34≦6.000; 1.600≦(T 1+G12+T2) / G23≦6.800; 1.700≦ALT / (T2+T3)≦2.600; 2.500≦TTL / D31 t 51≦4.000; and 1.300≦(D 11t 22+BFL) / Tmax≦2.800; in, V1 is an Abbe number of the first lens, V2 is an Abbe number of the second lens, V6 is an Abbe number of the sixth lens, T1 is a thickness of the first lens on the optical axis, T2 is a thickness of the second lens on the optical axis, T3 is a thickness of the third lens on the optical axis, Tavg is an average thickness of all lenses of the optical lens group on the optical axis, Tmax is a thickness of the thickest lens of the optical lens group on the optical axis, Tmin is a thickness of the thinnest lens of the optical lens group on the optical axis, EFL is an effective focal length of the optical lens group, Fno is an aperture value of the optical lens group, BFL is a distance from the second side surface of the sixth lens to a reference surface on the optical axis, D11t22 is a distance from the first side surface of the first lens to the second side surface of the second lens on the optical axis, D22t62 is a distance from the second side surface of the second lens to the second side surface of the sixth lens on the optical axis, the reference surface is a light emitting surface or an imaging surface, D 11t32 is a distance from the first side surface of the first lens to the second side surface of the third lens on the optical axis, D31t51 is a distance from the first side surface of the third lens to the first side surface of the fifth lens on the optical axis, AAG is a sum of five air gaps from the first lens to the sixth lens on the optical axis, ALT is a sum of six thicknesses from the first lens to the sixth lens on the optical axis, TTL is a distance from the first side surface of the first lens to a reference surface on the optical axis, ALT36 is a sum of four thicknesses from the third lens to the sixth lens on the optical axis, and ALT46 is a sum of three thicknesses from the fourth lens to the sixth lens on the optical axis. and, TL is a distance from the first side surface of the first lens to the second side surface of the sixth lens on the optical axis, G23 is an air gap between the second lens and the third lens on the optical axis, G34 is an air gap between the third lens and the fourth lens on the optical axis, G45 is an air gap between the fourth lens and the fifth lens on the optical axis, G56 is an air gap between the fifth lens and the sixth lens on the optical axis, G12 is an air gap between the first lens and the second lens on the optical axis, and the reference surface is a light-emitting surface or an imaging surface.

Images