Optical lens

Abstract

The present application relates to the field of optical lens, disclose an optical lens, the optical lens from the object side to the image side in order to contain: first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, ninth lens, tenth lens, eleventh lens and twelfth lens, and satisfy the following relationship: -0.80<=f12 / f10_11<=‑0.50;0.80<=f7 / f<=1.80;‑83.00<=f56 / (d9+d11)<=‑4.00;0.40<=NA*f / WD<=0.60.The optical lens of the present application has good optical performance, and has the characteristics of lower distortion, larger magnification and longer working distance.

Description

[Technical Field]

[0001] This invention relates to the field of optical lenses, and in particular to an optical lens suitable for industrial microscopes. [Background Technology]

[0002] Microscope objectives can perform specific imaging functions using a certain field of view, focal length, and relative aperture. However, due to the limitations of optical imaging principles, these optical parameters are mutually restrictive. Microscope objectives need to possess the characteristic of high resolution due to a large numerical aperture, but the higher the magnification and the larger the numerical aperture of a microscope objective, the more significant the impact of thickness and refractive index changes on the microscope's imaging quality. It is usually difficult to simultaneously achieve high imaging quality and high magnification. Furthermore, with the development of technology and the increasing diversity of user needs, the requirements for system imaging quality are constantly increasing, and twelve-element lens structures are gradually appearing in lens design. There is an urgent need for optical lenses with good optical performance, low distortion, high magnification, and long working distance. [Summary of the Invention]

[0003] To address the aforementioned problems, the present invention aims to provide an optical lens that can simultaneously meet the requirements of low distortion, high magnification, and long working distance with excellent optical performance.

[0004] To solve the above-mentioned technical problems, embodiments of the present invention provide an optical lens, which comprises, from the object side to the image side, the following lenses in sequence: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, and a twelfth lens.

[0005] The optical lens has a focal length of f, the combined focal length of the fifth and sixth lenses is f56, the on-axis thickness of the fifth lens is d9, the on-axis thickness of the sixth lens is d11, the focal length of the seventh lens is f7, the combined focal length of the tenth and eleventh lenses is f10-11, the focal length of the twelfth lens is f12, the working distance of the optical lens is WD, and the numerical aperture of the optical lens is NA, satisfying the following relationship:

[0006] -0.80≤f12 / f10_11≤-0.50;

[0007] 0.80≤f7 / f≤1.80;

[0008] -83.00≤f56 / (d9+d11)≤-4.00;

[0009] 0.40≤NA*f / WD≤0.60.

[0010] Preferably, the axial thickness d7 of the fourth lens and the axial distance d8 from the image side of the fourth lens to the object side of the fifth lens satisfy the following relationship:

[0011] 1.00≤d7 / d8≤22.50.

[0012] Preferably, the first lens has positive refractive power, and the object-side surface of the first lens is convex at the paraxial position;

[0013] The focal length of the first lens is f1, the central radius of curvature of the object side of the first lens is R1, the central radius of curvature of the image side of the first lens is R2, the axial thickness of the first lens is d1, and the total optical length of the optical lens is TTL, satisfying the following relationship:

[0014] 0.98 ≤ f1 / f ≤ 1.58;

[0015] -1.26≤(R1+R2) / (R1-R2)≤-0.83;

[0016] 0.02≤d1 / TTL≤0.09.

[0017] Preferably, the second lens has negative refractive power, the object side of the second lens is concave at the paraxial position, and the image side of the second lens is concave at the paraxial position.

[0018] The focal length of the second lens is f2, the central radius of curvature of the object-side surface of the second lens is R3, the central radius of curvature of the image-side surface of the second lens is R4, the axial thickness of the second lens is d3, and the total optical length of the optical lens is TTL, satisfying the following relationship:

[0019] -1.10≤f² / f≤-0.80;

[0020] 0.78≤(R3+R4) / (R3-R4)≤0.96;

[0021] 0.00≤d3 / TTL≤0.03.

[0022] Preferably, the third lens has negative refractive power, the object side of the third lens is concave at the paraxial position, and the image side of the third lens is concave at the paraxial position.

[0023] The third lens has a focal length of f3, a central radius of curvature of R5 on the object side, a central radius of curvature of R6 on the image side, an axial thickness of d5, and a total optical length of TTL, satisfying the following relationship:

[0024] -0.75≤f3 / f≤-0.56;

[0025] -0.85≤(R5+R6) / (R5-R6)≤-0.30;

[0026] 0.00≤d5 / TTL≤0.03.

[0027] Preferably, the fourth lens has positive refractive power, the object side of the fourth lens is convex at the paraxial position, and the image side of the fourth lens is convex at the paraxial position.

[0028] The fourth lens has a focal length of f4, a central radius of curvature of R7 on the object side, a central radius of curvature of R8 on the image side, an axial thickness of d7, and a total optical length of TTL, satisfying the following relationship:

[0029] 0.62≤f4 / f≤0.95;

[0030] 0.16≤(R7+R8) / (R7-R8)≤1.00;

[0031] 0.04≤d7 / TTL≤0.10.

[0032] Preferably, the fifth lens has negative refractive power, the object-side surface of the fifth lens is concave at the paraxial position, and the image-side surface of the fifth lens is concave at the paraxial position.

[0033] The fifth lens has a focal length of f5, a central radius of curvature of the object side of the fifth lens of R9, a central radius of curvature of the image side of the fifth lens of R10, and a total optical length of TTL, satisfying the following relationship:

[0034] -1.20≤f5 / f≤-0.55;

[0035] -0.41≤(R9+R10) / (R9-R10)≤-0.24;

[0036] 0.00≤d9 / TTL≤0.03.

[0037] Preferably, the sixth lens has positive refractive power, the object-side surface of the sixth lens is convex at the paraxial position, and the image-side surface of the sixth lens is convex at the paraxial position.

[0038] The sixth lens has a focal length of f6, a central radius of curvature of the object-side surface of the sixth lens of R11, a central radius of curvature of the image-side surface of the sixth lens of R12, and a total optical length of TTL, satisfying the following relationship:

[0039] 1.11≤f6 / f≤1.45;

[0040] -0.10≤(R11+R12) / (R11-R12)≤0.25;

[0041] 0.05≤d11 / TTL≤0.10.

[0042] Preferably, the seventh lens has positive refractive power, the object-side surface of the seventh lens is convex at the paraxial position, and the image-side surface of the seventh lens is convex at the paraxial position.

[0043] The seventh lens has a central radius of curvature of R13 on the object side and R14 on the image side. The seventh lens has an axial thickness of d13, and the total optical length of the optical lens is TTL, satisfying the following relationship:

[0044] -0.60≤(R13+R14) / (R13-R14)≤0.15;

[0045] 0.04≤d13 / TTL≤0.07.

[0046] Preferably, the eighth lens has negative refractive power, and the image-side surface of the eighth lens is concave at the paraxial position;

[0047] The eighth lens has a focal length of f8, a central radius of curvature of R15 on the object side, a central radius of curvature of R16 on the image side, an axial thickness of d15, and a total optical length of TTL, satisfying the following relationship:

[0048] -3.10≤f8 / f≤-0.69;

[0049] 0.14≤(R15+R16) / (R15-R16)≤3.00;

[0050] 0.00≤d15 / TTL≤0.04.

[0051] Preferably, the ninth lens has positive refractive power, the object side of the ninth lens is convex at the paraxial position, and the image side of the ninth lens is convex at the paraxial position.

[0052] The ninth lens has a focal length of f9, a central radius of curvature of R17 on the object side, a central radius of curvature of R18 on the image side, an axial thickness of d17, and a total optical length of TTL, satisfying the following relationship:

[0053] 0.84≤f9 / f≤1.79;

[0054] -0.90≤(R17+R18) / (R17-R18)≤-0.14;

[0055] 0.08≤d17 / TTL≤0.14.

[0056] Preferably, the tenth lens has positive refractive power, the object side of the tenth lens is convex at the paraxial position, and the image side of the tenth lens is convex at the paraxial position.

[0057] The tenth lens has a focal length of f10, a central radius of curvature of the object side of the tenth lens of R19, a central radius of curvature of the image side of the tenth lens of R20, an axial thickness of d19, and a total optical length of TTL, satisfying the following relationship:

[0058] 0.90≤f10 / f≤1.15;

[0059] -0.45≤(R19+R20) / (R19-R20)≤0.00;

[0060] 0.06≤d19 / TTL≤0.15.

[0061] Preferably, the eleventh lens has negative refractive power, the object side of the eleventh lens is concave at the paraxial position, and the image side of the eleventh lens is concave at the paraxial position.

[0062] The eleventh lens has a focal length of f11, a central radius of curvature of R21 on the object side, a central radius of curvature of R22 on the image side, an axial thickness of d21, and a total optical length of TTL, satisfying the following relationship:

[0063] -0.69≤f11 / f≤-0.50;

[0064] 0.35≤(R21+R22) / (R21-R22)≤0.60;

[0065] 0.00≤d21 / TTL≤0.03.

[0066] Preferably, the twelfth lens has positive refractive power, and the object-side surface of the twelfth lens is convex at the paraxial position;

[0067] The twelfth lens has a focal length of f12, a central radius of curvature of R23 on the object side, a central radius of curvature of R24 on the image side, an axial thickness of d23, and a total optical length of TTL, satisfying the following relationship:

[0068] 0.93 ≤ f12 / f ≤ 1.33;

[0069] -1.35≤(R23+R24) / (R23-R24)≤-0.65;

[0070] 0.04≤d23 / TTL≤0.15.

[0071] Preferably, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens, and the twelfth lens are all made of glass.

[0072] The beneficial effects of the present invention are as follows: the optical lens according to the present invention has good optical performance and features low distortion, high magnification and long working distance. [Attached Image Description]

[0073] Figure 1 This is a schematic diagram of the structure of the optical lens according to the first embodiment of the present invention;

[0074] Figure 2 yes Figure 1 A schematic diagram of axial aberrations of the optical lens shown.

[0075] Figure 3 yes Figure 1 A schematic diagram of chromatic aberration at magnification for the optical lens shown.

[0076] Figure 4 yes Figure 1 A schematic diagram of the field curvature and distortion of the optical lens shown;

[0077] Figure 5 This is a schematic diagram of the structure of the optical lens according to the second embodiment of the present invention;

[0078] Figure 6 yes Figure 5 A schematic diagram of axial aberrations of the optical lens shown.

[0079] Figure 7 yes Figure 5 A schematic diagram of chromatic aberration at magnification for the optical lens shown.

[0080] Figure 8 yes Figure 5 A schematic diagram of the field curvature and distortion of the optical lens shown;

[0081] Figure 9 This is a schematic diagram of the structure of the optical lens according to the third embodiment of the present invention;

[0082] Figure 10 yes Figure 9 A schematic diagram of axial aberrations of the optical lens shown.

[0083] Figure 11 yes Figure 9 A schematic diagram of chromatic aberration at magnification for the optical lens shown.

[0084] Figure 12 yes Figure 9 A schematic diagram of the field curvature and distortion of the optical lens shown;

[0085] Figure 13 This is a schematic diagram of the structure of the optical lens according to the fourth embodiment of the present invention;

[0086] Figure 14 yes Figure 13 A schematic diagram of axial aberrations of the optical lens shown.

[0087] Figure 15 yes Figure 13 A schematic diagram of chromatic aberration at magnification for the optical lens shown.

[0088] Figure 16 yes Figure 13 A schematic diagram of the field curvature and distortion of the optical lens shown;

[0089] Figure 17 This is a schematic diagram of the structure of the optical lens according to the fifth embodiment of the present invention;

[0090] Figure 18 yes Figure 17 A schematic diagram of axial aberrations of the optical lens shown.

[0091] Figure 19 yes Figure 17 A schematic diagram of chromatic aberration at magnification for the optical lens shown.

[0092] Figure 20 yes Figure 17 A schematic diagram of the field curvature and distortion of the optical lens shown;

[0093] Figure 21 This is a schematic diagram of the structure of the optical lens according to the sixth embodiment of the present invention;

[0094] Figure 22 yes Figure 21 A schematic diagram of axial aberrations of the optical lens shown.

[0095] Figure 23 yes Figure 21 A schematic diagram of chromatic aberration at magnification for the optical lens shown.

[0096] Figure 24 yes Figure 21 The diagram shows the field curvature and distortion of the optical lens.

Detailed Implementation Methods

[0097] To make the objectives, technical solutions, and advantages of this invention clearer, the various embodiments of this invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this invention to facilitate a better understanding of the invention. However, the technical solutions claimed in this invention can be implemented even without these technical details and with various variations and modifications based on the following embodiments.

[0098] (First Implementation)

[0099] Referring to the accompanying drawings, the present invention provides an optical lens 10. Figure 1 The image shows an optical lens 10 according to a first embodiment of the present invention. The optical lens 10 includes twelve lenses. Specifically, the optical lens 10, from the object side to the image side, includes, in sequence: a first lens L1, a second lens L2, an aperture S1, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, a tenth lens L10, an eleventh lens L11, and a twelfth lens L12. An optical filter or other optical element may be disposed between the twelfth lens L12 and the image plane S1.

[0100] The combined focal length of the tenth lens L10 and the eleventh lens L11 is defined as f10_11, and the focal length of the twelfth lens L12 is defined as f12. -0.80≤f12 / f10_11≤-0.50 specifies the range of the ratio of the focal length of the object-side lens group and the lens closest to the object, which can ensure that the light rays at the image-side end have sufficient converging ability.

[0101] The focal length of the seventh lens L7 is defined as f7, and the focal length of the optical lens 10 is defined as f. 0.80≤f7 / f≤1.80 specifies the ratio of the seventh lens L7 to the total focal length f of the system. While correcting aberrations to ensure imaging quality, the total length of the optical lens 10 can be effectively controlled.

[0102] The combined focal length of the fifth lens L5 and the sixth lens L6 is defined as f56, the on-axis thickness of the fifth lens L5 is defined as d9, and the on-axis thickness of the sixth lens L6 is defined as d11. The range of -83.00≤f56 / (d9+d11)≤-4.00 specifies the combined focal length of the fifth lens L5 and the sixth lens L6, and the range of the ratio of the sum of the on-axis thicknesses d9 and d11 of the fifth lens L5 and the sixth lens L6. This ensures sufficient refractive power while maintaining a reasonable lens thickness, which is beneficial for correcting distortion and making the distortion |Distortion|≤1%.

[0103] The working distance of the optical lens (i.e., the axial distance from the object plane to the object side of the first lens L1) is defined as WD, and the numerical aperture of the optical lens 10 is defined as NA. 0.40≤NA*f / WD≤0.60 specifies the conditions that the numerical aperture and resolution of the optical lens 10 must satisfy. Within the range of the relation, the optical lens 10 has a relatively larger numerical aperture and stronger resolution.

[0104] When the distance from the object side of the first lens L1 of the optical lens 10 of the present invention to the observed object, the total optical length, the numerical aperture, the focal length, the correlated focal length, and the on-axis thickness satisfy the above-mentioned relationship, the optical lens 10 can have good optical performance and have the characteristics of low distortion, large magnification and long working distance, wherein the magnification can reach 5 times.

[0105] The on-axis thickness d7 of the fourth lens L4 is defined, and the on-axis distance from the image side of the fourth lens L4 to the object side of the fifth lens L5 is defined as d8, satisfying the following relationship: 1.00≤d7 / d8≤22.50. This specifies the ratio of the thickness d7 of the fourth lens L5 to the air gap between the fourth lens L4 and the fifth lens L5. Within the range of the condition, this is helpful for lens assembly.

[0106] In this embodiment, the first lens L1 is made of glass, the second lens L2 is made of glass, the third lens L3 is made of glass, the fourth lens L4 is made of glass, the fifth lens L5 is made of glass, the sixth lens L6 is made of glass, the seventh lens L7 is made of glass, the eighth lens L8 is made of glass, the ninth lens L9 is made of glass, the tenth lens L10 is made of glass, the eleventh lens L11 is made of glass, and the twelfth lens L12 is made of glass.

[0107] In this embodiment, the object-side surface of the first lens L1 is convex near the axis, and the image-side surface is concave near the axis, giving the first lens L1 positive refractive power. In other optional embodiments, the object-side and image-side surfaces of the first lens L1 can also be configured with other concave and convex distributions, and the first lens L1 can also have negative refractive power.

[0108] The focal length of the first lens L1 is f1, and it satisfies the following relationship: 0.98≤f1 / f≤1.58. Through the reasonable allocation of optical power, the system has better imaging quality and lower sensitivity.

[0109] The center radius of curvature of the object side of the first lens L1 is defined as R1, and the center radius of curvature of the image side of the first lens L1 is defined as R2, and the following relationship is satisfied: -1.26≤(R1+R2) / (R1-R2)≤-0.83. By reasonably controlling the shape of the first lens L1, the first lens can effectively correct the spherical aberration of the system.

[0110] The on-axis thickness of the first lens L1 is d1, and the total optical length of the optical lens 10 is TTL, and the following relationship is satisfied: 0.02≤d1 / TTL≤0.09, which helps in lens assembly and effectively controls lens thickness and total lens length.

[0111] In this embodiment, the object-side surface of the second lens L2 is concave near the axis, and the image-side surface is also concave near the axis, thus the second lens L2 has negative refractive power. In other optional embodiments, the object-side and image-side surfaces of the second lens L2 can also be configured with other concave and convex distributions, and the second lens L2 can also have positive refractive power.

[0112] The focal length of the second lens L2 is f2, and it satisfies the following relationship: -1.10≤f2 / f≤-0.80. Through the reasonable allocation of optical power, the system has better imaging quality and lower sensitivity.

[0113] The center radius of curvature of the object side of the second lens L2 is R3, and the center radius of curvature of the image side of the second lens L2 is R4, and they satisfy the following relationship: 0.78≤(R3+R4) / (R3-R4)≤0.96, which defines the shape of the second lens L2. Within the range specified by the condition, the degree of refraction of light passing through the lens can be mitigated, and aberrations can be effectively reduced.

[0114] The on-axis thickness of the second lens L2 is d3, and the total optical length of the optical lens 10 is TTL, satisfying the following relationship: 0.00≤d3 / TTL≤0.03, which helps in lens assembly and effectively controls lens thickness and total lens length.

[0115] In this embodiment, the object-side surface of the third lens L3 is concave near the axis, and the image-side surface is also concave near the axis, thus the third lens L3 has negative refractive power. In other optional embodiments, the object-side and image-side surfaces of the third lens L3 can also be configured with other concave and convex distributions, and the third lens L3 can also have positive refractive power.

[0116] The focal length of the third lens L3 is f3, and it satisfies the following relationship: -0.75≤f3 / f≤-0.56. Through the reasonable allocation of optical power, the system has better imaging quality and lower sensitivity.

[0117] The central radius of curvature of the object side of the third lens L3 is R5, and the central radius of curvature of the image side of the third lens L3 is R6, and the following relationship is satisfied: -0.85≤(R5+R6) / (R5-R6)≤-0.30, which defines the shape of the third lens L3. Within the range specified by the condition, the degree of refraction of light passing through the lens can be mitigated, and aberrations can be effectively reduced.

[0118] The on-axis thickness of the third lens L3 is d5, and the total optical length of the optical lens 10 is TTL, satisfying the following relationship: 0.00≤d5 / TTL≤0.03, which helps in lens assembly and effectively controls lens thickness and total lens length.

[0119] In this embodiment, the object-side surface of the fourth lens L4 is convex near the axis, and the image-side surface is also convex near the axis, thus the fourth lens L4 has positive refractive power. In other optional embodiments, the object-side surface and image-side surface of the fourth lens L4 can also be configured with other concave and convex distributions, and the fourth lens L4 can also have negative refractive power.

[0120] The focal length of the fourth lens L4 is f4, and it satisfies the following relationship: 0.62≤f4 / f≤0.95. This specifies the ratio of the focal length f4 of the fourth lens L4 to the focal length f of the system, which helps to improve the performance of the optical system within the range of the condition.

[0121] The central radius of curvature of the object side of the fourth lens L4 is R7, and the central radius of curvature of the image side of the fourth lens L4 is R8, and the following relationship is satisfied: 0.16≤(R7+R8) / (R7-R8)≤1.00, which defines the shape of the fourth lens L4. Within the range specified by the condition, the degree of refraction of light passing through the lens can be mitigated, and aberrations can be effectively reduced.

[0122] The on-axis thickness of the fourth lens L4 is d7, and the total optical length of the optical lens is TTL, and the following relationship is satisfied: 0.04≤d7 / TTL≤0.10, which helps with lens assembly and effectively controls lens thickness and total lens length.

[0123] In this embodiment, the object-side surface of the fifth lens L5 is concave near the axis, and the image-side surface is also concave near the axis, thus the fifth lens L5 has positive refractive power. In other optional embodiments, the object-side and image-side surfaces of the fifth lens L5 can also be configured with other concave and convex distributions, and the fifth lens L5 can also have negative refractive power.

[0124] The focal length of the fifth lens L5 is f5, and it satisfies the following relationship: -1.20≤f5 / f≤-0.55. This specifies the ratio of the focal length f5 of the fifth lens L5 to the focal length f of the system, which helps to improve the performance of the optical system within the range of the condition.

[0125] The central radius of curvature of the object side of the fifth lens L5 is R9, and the central radius of curvature of the image side of the fifth lens L5 is R10, and they satisfy the following relationship: -0.41≤(R9+R10) / (R9-R10)≤-0.24. This specifies the shape of the fifth lens L5. Within the range specified by the condition, it can mitigate the degree of refraction of light passing through the lens and effectively reduce aberrations.

[0126] The on-axis thickness of the fifth lens L5 is d9, and it satisfies the following relationship: 0.00≤d9 / TTL≤0.03, which helps with lens assembly and effectively controls lens thickness and overall lens length.

[0127] In this embodiment, the object-side surface of the sixth lens L6 is convex near the axis, and the image-side surface is also convex near the axis, thus the sixth lens L6 has positive refractive power. In other optional embodiments, the object-side surface and image-side surface of the sixth lens L6 can also be configured with other concave and convex distributions, and the sixth lens L6 can also have negative refractive power.

[0128] The focal length of the sixth lens L6 is f6, and it satisfies the following relationship: 1.11≤f6 / f≤1.45. This specifies the ratio of the focal length f6 of the sixth lens L6 to the focal length f of the system, which helps to improve the performance of the optical system within the range of the condition.

[0129] The central radius of curvature of the object side of the sixth lens L6 is R11, and the central radius of curvature of the image side of the sixth lens L6 is R12, and they satisfy the following relationship: -0.10≤(R11+R12) / (R11-R12)≤0.25, which defines the shape of the sixth lens L6. Within the range specified by the condition, the degree of refraction of light passing through the lens can be mitigated, and aberrations can be effectively reduced.

[0130] The on-axis thickness of the sixth lens L6 is d11, and it satisfies the following relationship: 0.05≤d11 / TTL≤0.10, which helps with lens assembly and effectively controls lens thickness and overall lens length.

[0131] In this embodiment, the object-side surface of the seventh lens L7 is convex near the axis, and the image-side surface is also convex near the axis, thus the seventh lens L7 has positive refractive power. In other optional embodiments, the object-side surface and image-side surface of the seventh lens L7 can also be configured with other concave and convex distributions, and the seventh lens L7 can also have negative refractive power.

[0132] The central radius of curvature of the object-side surface of the seventh lens L7 is R13, and the central radius of curvature of the image-side surface of the seventh lens is R14, satisfying the following relationship: -0.60≤(R13+R14) / (R13-R14)≤0.15. This specifies the shape of the seventh lens L7. Within the range specified by the condition, it can mitigate the degree of refraction of light passing through the lens, effectively reducing aberrations.

[0133] The on-axis thickness of the seventh lens L7 is d13, and it satisfies the following relationship: 0.04≤d13 / TTL≤0.07, which helps with lens assembly and effectively controls lens thickness and overall lens length.

[0134] In this embodiment, the object-side surface of the eighth lens L8 is convex near the axis, and the image-side surface is concave near the axis, thus the eighth lens L8 has negative refractive power. In other optional embodiments, the object-side and image-side surfaces of the eighth lens L8 can also be configured with other concave and convex distributions, and the eighth lens L8 can also have positive refractive power.

[0135] The focal length of the eighth lens L8 is f8, and it satisfies the following relationship: -3.10≤f8 / f≤-0.69, which specifies the ratio of the focal length f8 of the eighth lens L8 to the focal length f of the system. Within the range of the condition, this helps to improve the performance of the optical system.

[0136] The central radius of curvature of the object-side surface of the eighth lens L8 is R15, and the central radius of curvature of the image-side surface of the seventh lens is R16, satisfying the following relationship: 0.14≤(R15+R16) / (R15-R16)≤3.00. This specifies the shape of the eighth lens L8. Within the range specified by the condition, it can mitigate the degree of light refraction through the lens, effectively reducing aberrations.

[0137] The on-axis thickness of the eighth lens L8 is d15, and it satisfies the following relationship: 0.00≤d15 / TTL≤0.04, which helps with lens assembly and effectively controls lens thickness and overall lens length.

[0138] In this embodiment, the object-side surface of the ninth lens L9 is convex near the axis, and the image-side surface is also convex near the axis, thus the ninth lens L9 has positive refractive power. In other optional embodiments, the object-side surface and image-side surface of the ninth lens L9 can also be configured with other concave and convex distributions, and the ninth lens L9 can also have negative refractive power.

[0139] The focal length of the ninth lens L9 is f9, and it satisfies the following relationship: 0.84≤f9 / f≤1.79. This specifies the ratio of the focal length f9 of the ninth lens L9 to the focal length f of the system, which helps to improve the performance of the optical system within the range of the condition.

[0140] The central radius of curvature of the object side of the ninth lens L9 is R17, and the central radius of curvature of the image side of the ninth lens L9 is R18, and they satisfy the following relationship: -0.90≤(R17+R18) / (R17-R18)≤-0.14. This specifies the shape of the ninth lens L9. Within the range specified by the condition, it can mitigate the degree of light deflection after passing through the lens and effectively reduce aberrations.

[0141] The on-axis thickness of the ninth lens is d17, and it satisfies the following relationship: 0.08≤d17 / TTL≤0.14, which helps with lens assembly and effectively controls lens thickness and overall lens length.

[0142] In this embodiment, the object-side surface of the tenth lens L10 is convex near the axis, and the image-side surface is also convex near the axis, thus the tenth lens L10 has positive refractive power. In other optional embodiments, the object-side surface and image-side surface of the tenth lens L10 can also be configured with other concave and convex distributions, and the tenth lens L10 can also have negative refractive power.

[0143] The focal length of the tenth lens L10 is f10, and it satisfies the following relationship: 0.90≤f10 / f≤1.15; the ratio of the focal length f10 of the tenth lens L10 to the focal length f of the system is specified, which helps to improve the performance of the optical system within the range of the condition.

[0144] The central radius of curvature of the object side of the tenth lens L10 is R19, and the central radius of curvature of the image side of the tenth lens L10 is R20. They satisfy the following relationship -0.45≤(R19+R20) / (R19-R20)≤0.00, which specifies the shape of the tenth lens L10. Within the range specified by the condition, the degree of refraction of light passing through the lens can be mitigated, effectively reducing aberrations.

[0145] The on-axis thickness of the tenth lens L10 is d19, and it satisfies the following relationship: 0.06≤d19 / TTL≤0.15, which helps with lens assembly and effectively controls lens thickness and overall lens length.

[0146] In this embodiment, the object-side surface of the eleventh lens L11 is concave near the axis, and the image-side surface is also concave near the axis, thus the eleventh lens L11 has negative refractive power. In other optional embodiments, the object-side surface and image-side surface of the eleventh lens L11 can also be configured with other concave and convex distributions, and the eleventh lens L11 can also have positive refractive power.

[0147] The focal length of the eleventh lens is f11, and it satisfies the following relationship: -0.69≤f11 / f≤-0.50, which specifies the ratio of the focal length f11 of the eleventh lens L11 to the focal length f of the system. Within the range of the condition, this helps to improve the performance of the optical system.

[0148] The central radius of curvature of the object side of the eleventh lens L11 is R21, and the central radius of curvature of the image side of the eleventh lens is R22. 0.35≤(R21+R22) / (R21-R22)≤0.60. Within the range specified by the condition formula, the degree of refraction of light passing through the lens can be mitigated, effectively reducing aberrations.

[0149] The axial thickness of the eleventh lens L11 is d21, and it satisfies the following relationship: 0.00≤d21 / TTL≤0.03, which helps with lens assembly and effectively controls lens thickness and overall lens length.

[0150] In this embodiment, the object-side surface of the twelfth lens L12 is convex near the axis, and the image-side surface is concave near the axis, thus the twelfth lens L12 has positive refractive power. In other optional embodiments, the object-side and image-side surfaces of the twelfth lens L12 can also be configured with other concave and convex distributions, and the twelfth lens L12 can also have negative refractive power.

[0151] The focal length of the twelfth lens L12 is f12, and it satisfies the following relationship: 0.93≤f12 / f≤1.33. This specifies the ratio of the focal length f12 of the twelfth lens L12 to the focal length f of the system, which helps to improve the performance of the optical system within the range of the condition.

[0152] The central radius of curvature of the object side of the twelfth lens L12 is R23, and the central radius of curvature of the image side of the twelfth lens L12 is R24, and they satisfy the following relationship: -1.35≤(R23+R24) / (R23-R24)≤-0.65. This specifies the shape of the twelfth lens L12. Within the range specified by the condition, it can mitigate the degree of refraction of light passing through the lens and effectively reduce aberrations.

[0153] The axial thickness of the twelfth lens L12 is d23, and it satisfies the following relationship: 0.04≤d23 / TTL≤0.15, which helps with lens assembly and effectively controls lens thickness and overall lens length.

[0154] In this embodiment, an aperture S1 is provided between the second lens L2 and the third lens L3. The axial distance from the image side of the second lens L2 to the aperture S1 is 6.490 mm, and the axial distance from the aperture S1 to the object side of the third lens L3 is 5.110 mm.

[0155] The optical lens 10 of the present invention will be described below with examples. The symbols used in each example are shown below. The units for focal length, on-axis distance, center radius of curvature, and on-axis thickness are mm.

[0156] TTL: Optical Length (axial distance from the object surface of the first lens L1 to the imaging surface), in mm;

[0157] Preferably, the object-side and / or image-side surfaces of the lens may also be provided with inflection points and / or stagnation points to meet the requirements of high-quality imaging. Specific possible implementation schemes are described below.

[0158] Table 1 shows the design data of the optical lens 10 according to the first embodiment of the present invention.

[0159] Table 1

[0160]

[0161] Wherein, INF represents infinity, and the meanings of each symbol are as follows.

[0162] OBJ: Object surface;

[0163] R: Radius of curvature at the center of the optical surface;

[0164] R1: The central radius of curvature of the object-side surface of the first lens L1;

[0165] R2: The central radius of curvature of the image-side surface of the first lens L1;

[0166] R3: The central radius of curvature of the object-side surface of the second lens L2;

[0167] R4: The central radius of curvature of the image-side surface of the second lens L2;

[0168] R5: The central radius of curvature of the object-side surface of the third lens L3;

[0169] R6: The central radius of curvature of the image-side surface of the third lens L3;

[0170] R7: The central radius of curvature of the object side surface of the fourth lens L4;

[0171] R8: The central radius of curvature of the image-side surface of the fourth lens L4;

[0172] R9: The central radius of curvature of the object-side surface of the fifth lens L5;

[0173] R10: The central radius of curvature of the image-side surface of the fifth lens L5;

[0174] R11: The central radius of curvature of the object-side surface of the sixth lens L6;

[0175] R12: The central radius of curvature of the image-side surface of the sixth lens L6;

[0176] R13: The central radius of curvature of the object-side surface of the seventh lens L7;

[0177] R14: The central radius of curvature of the image-side surface of the seventh lens L7;

[0178] R15: The central radius of curvature of the object side surface of the eighth lens L8;

[0179] R16: The central radius of curvature of the image-side surface of the eighth lens L8;

[0180] R17: The central radius of curvature of the object side surface of the ninth lens L9;

[0181] R18: The central radius of curvature of the image-side surface of the ninth lens L9;

[0182] R19: The central radius of curvature of the object-side surface of the tenth lens L10.

[0183] R20: The central radius of curvature of the image-side surface of the tenth lens L10;

[0184] R21: The central radius of curvature of the object-side surface of the eleventh lens L11;

[0185] R22: The central radius of curvature of the image-side surface of the eleventh lens L11;

[0186] R23: The central radius of curvature of the object-side surface of the twelfth lens L12;

[0187] R24: The central radius of curvature of the image-side surface of the twelfth lens L12;

[0188] d: The axial thickness of the lens and the axial distance between lenses;

[0189] d1: On-axis thickness of the first lens L1;

[0190] d2: The on-axis distance from the image-side surface of the first lens L1 to the object-side surface of the second lens L2;

[0191] d3: On-axis thickness of the second lens L2;

[0192] d4: The axial distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3;

[0193] d5: On-axis thickness of the third lens L3;

[0194] d6: The on-axis distance from the image-side surface of the third lens L3 to the object-side surface of the fourth lens L4;

[0195] d7: On-axis thickness of the fourth lens L4;

[0196] d8: The on-axis distance from the image-side surface of the fourth lens L4 to the object-side surface of the fifth lens L5;

[0197] d9: On-axis thickness of the fifth lens L5;

[0198] d10: The axial distance from the image-side surface of the fifth lens L5 to the object-side surface of the sixth lens L6;

[0199] d11: On-axis thickness of the sixth lens L6;

[0200] d12: The axial distance from the image-side surface of the sixth lens L6 to the object-side surface of the seventh lens L7;

[0201] d13: On-axis thickness of the seventh lens L7;

[0202] d14: The on-axis distance from the image-side surface of the seventh lens L7 to the object-side surface of the eighth lens L8;

[0203] d15: On-axis thickness of the eighth lens L8;

[0204] d16: The on-axis distance from the image-side surface of the eighth lens L8 to the object-side surface of the ninth lens L9;

[0205] d17: On-axis thickness of the ninth lens L9;

[0206] d18: The on-axis distance from the image-side surface of the ninth lens L9 to the object-side surface of the tenth lens L10;

[0207] d19: On-axis thickness of the tenth lens L10;

[0208] d20: The on-axis distance from the image-side surface of the tenth lens L10 to the object-side surface of the eleventh lens L11;

[0209] d21: On-axis thickness of the eleventh lens L11;

[0210] d22: The axial distance from the image-side surface of the eleventh lens L11 to the object-side surface of the twelfth lens L12;

[0211] d23: On-axis thickness of the twelfth lens L12;

[0212] d24: The axial distance from the image-side surface of the twelfth lens L12 to the object-side surface of the optical filter;

[0213] nd: Refractive index of the d-line;

[0214] nd1: The refractive index of the d-line of the first lens L1;

[0215] nd2: The refractive index of the d-line of the second lens L2;

[0216] nd3: The refractive index of the d-line of the third lens L3;

[0217] nd4: The refractive index of the d-line of the fourth lens L4;

[0218] nd5: The refractive index of the d-line of the fifth lens L5;

[0219] nd6: The refractive index of the d-line of the sixth lens L6;

[0220] nd7: The refractive index of the d-line of the seventh lens L7;

[0221] nd8: The refractive index of the d-line of the eighth lens L8;

[0222] nd9: The refractive index of the d-line of the ninth lens L9;

[0223] nd10: The refractive index of the d-line of the tenth lens L10;

[0224] nd11: The refractive index of the d-line of the eleventh lens L11;

[0225] nd12: The refractive index of the d-line of the twelfth lens L12;

[0226] vd: Abbe number;

[0227] v1: Abbe number of the first lens L1;

[0228] v2: Abbe number of the second lens L2;

[0229] v3: Abbe number of the third lens L3;

[0230] v4: Abbe number of the fourth lens L4;

[0231] v5: Abbe number of the fifth lens L5;

[0232] v6: Abbe number of the sixth lens L6;

[0233] v7: Abbe number of the seventh lens L7;

[0234] v8: Abbe number of the eighth lens L8;

[0235] v9: Abbe number of the ninth lens L9;

[0236] v10: Abbe number of the tenth lens L10;

[0237] v11: Abbe number of the eleventh lens L11;

[0238] v12: The Abbe number of the twelfth lens L12.

[0239] Figure 2 , Figure 3 A schematic diagrams of axial aberration and magnification chromatic aberration are shown respectively after light with wavelengths of 632nm, 546nm and 486nm passes through the optical lens 10 of the first embodiment. Figure 4 This shows a schematic diagram of field curvature and distortion after light with a wavelength of 546nm passes through the optical lens 10 of the first embodiment. Figure 4 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0240] Table 7, which appears later, shows the values ​​corresponding to the various numerical values ​​and the parameters specified in the conditional expressions for each of Examples 1, 2, 3, 4, 5, and 6.

[0241] As shown in Table 7, the first embodiment satisfies all the conditional expressions.

[0242] In this embodiment, the optical lens has an entrance pupil diameter of 24.765 mm, a numerical aperture of 0.35, and a full field-of-view image height of 4.0 mm, exhibiting good optical performance, as well as characteristics of low distortion, high magnification, and long working distance.

[0243] (Second Implementation)

[0244] The second implementation method is basically the same as the first implementation method, and the symbols have the same meanings as the first implementation method. Only the differences are listed below.

[0245] In this embodiment, an aperture S1 is provided between the second lens L2 and the third lens L3. The axial distance from the image side of the second lens L2 to the aperture S1 is 3.710 mm, and the axial distance from the aperture S1 to the object side of the third lens L3 is 3.740 mm.

[0246] In this embodiment, the image-side surface of the first lens L1 is convex at the paraxial position, and the object-side surface of the eighth lens L8 is concave at the paraxial position.

[0247] Table 2 shows the design data of the optical lens 20 according to the second embodiment of the present invention.

[0248] Table 2

[0249]

[0250]

[0251] Figure 6 , Figure 7 Axial aberration and magnification chromatic aberration are shown respectively after light with wavelengths of 632nm, 546nm and 486nm passes through the optical lens 20 of the second embodiment. Figure 8 This shows a schematic diagram of field curvature and distortion after light with a wavelength of 546nm passes through the optical lens 20 of the second embodiment. Figure 8 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0252] Table 7, which appears later, shows the values ​​corresponding to the various numerical values ​​and the parameters specified in the conditional expressions for each of Examples 1, 2, 3, 4, 5, and 6.

[0253] As shown in Table 7, the second embodiment satisfies all the conditional expressions.

[0254] In this embodiment, the optical lens has an entrance pupil diameter of 25.250 mm, a numerical aperture of 0.35, and a full field-of-view image height of 4.0 mm, exhibiting good optical performance, as well as characteristics of low distortion, high magnification, and long working distance.

[0255] (Third Implementation)

[0256] The third implementation method is basically the same as the first implementation method, and the symbols have the same meanings as the first implementation method. Only the differences are listed below.

[0257] In this embodiment, an aperture S1 is provided between the second lens L2 and the third lens L3. The axial distance from the image side of the second lens L2 to the aperture S1 is 2.961 mm, and the axial distance from the aperture S1 to the object side of the third lens L3 is 2.749 mm.

[0258] In this embodiment, the image-side surface of the first lens L1 is convex at the paraxial position, the object-side surface of the eighth lens L8 is concave at the paraxial position, and the image-side surface of the twelfth lens L12 is convex at the paraxial position.

[0259] Table 3 shows the design data of the optical lens 30 according to the third embodiment of the present invention.

[0260] Table 3

[0261]

[0262]

[0263] Figure 10 , Figure 11 A schematic diagrams of axial aberration and magnification chromatic aberration are shown respectively after light with wavelengths of 632nm, 546nm and 486nm passes through the optical lens 30 of the third embodiment. Figure 12 This illustrates the field curvature and distortion of light with a wavelength of 546 nm after passing through the optical lens 30 of the third embodiment. Figure 12 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0264] Table 7, which appears later, shows the values ​​corresponding to the various numerical values ​​and the parameters specified in the conditional expressions for each of Examples 1, 2, 3, 4, 5, and 6.

[0265] As shown in Table 7, the third embodiment satisfies all the conditional expressions.

[0266] In this embodiment, the optical lens has an entrance pupil diameter of 22.500 mm, a numerical aperture of 0.31, and a full field-of-view image height of 4.0 mm, exhibiting good optical performance, as well as characteristics of low distortion, high magnification, and long working distance.

[0267] (Fourth Implementation)

[0268] The fourth implementation method is basically the same as the first implementation method, and the symbols have the same meanings as the first implementation method. Only the differences are listed below.

[0269] In this embodiment, an aperture S1 is provided between the second lens L2 and the third lens L3. The axial distance from the image side of the second lens L2 to the aperture S1 is 3.762 mm, and the axial distance from the aperture S1 to the object side of the third lens L3 is 3.386 mm.

[0270] In this embodiment, the image-side surface of the first lens L1 is convex at the paraxial position, and the object-side surface of the eighth lens L8 is concave at the paraxial position.

[0271] Table 4 shows the design data of the optical lens 40 according to the fourth embodiment of the present invention.

[0272] Table 4

[0273]

[0274] Figure 14 , Figure 15 Axial aberration and magnification chromatic aberration are shown respectively after light with wavelengths of 632nm, 546nm and 486nm passes through the optical lens 40 of the fourth embodiment. Figure 16 This illustrates the field curvature and distortion of light with a wavelength of 546 nm after passing through the optical lens 40 of the fourth embodiment. Figure 16 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0275] Table 7, which appears later, shows the values ​​corresponding to the various numerical values ​​and the parameters specified in the conditional expressions for each of Examples 1, 2, 3, 4, 5, and 6.

[0276] As shown in Table 7, the fourth embodiment satisfies all the conditional expressions.

[0277] In this embodiment, the optical lens has an entrance pupil diameter of 25.250 mm, a numerical aperture of 0.35, and a full field-of-view image height of 4.0 mm, exhibiting good optical performance, as well as characteristics of low distortion, high magnification, and long working distance.

[0278] (Fifth Implementation)

[0279] The fifth embodiment is basically the same as the first embodiment, and the symbols have the same meanings as the first embodiment. Only the differences are listed below.

[0280] In this embodiment, an aperture S1 is provided between the second lens L2 and the third lens L3. The on-axis distance from the image side of the second lens L2 to the aperture S1 is 3.167 mm, and the on-axis distance from the aperture S1 to the object side of the third lens L3 is 3.244 mm.

[0281] In this embodiment, the image-side surface of the first lens L1 is convex at the paraxial position, the object-side surface of the eighth lens L8 is concave at the paraxial position, and the image-side surface of the twelfth lens L12 is convex at the paraxial position.

[0282] Table 5 shows the design data of the optical lens 50 according to the fifth embodiment of the present invention.

[0283] Table 5

[0284]

[0285]

[0286] Figure 18 , Figure 19 A schematic diagrams of axial aberration and magnification chromatic aberration are shown respectively after light with wavelengths of 632nm, 546nm and 486nm passes through the optical lens 50 of the fifth embodiment. Figure 20 This illustrates the field curvature and distortion of light with a wavelength of 546 nm after passing through the optical lens 50 of the fifth embodiment. Figure 20 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0287] Table 7, which appears later, shows the values ​​corresponding to the various numerical values ​​and the parameters specified in the conditional expressions for each of Examples 1, 2, 3, 4, 5, and 6.

[0288] As shown in Table 7, the fifth embodiment satisfies all the conditional expressions.

[0289] In this embodiment, the optical lens has an entrance pupil diameter of 24.000 mm, a numerical aperture of 0.33, and a full field-of-view image height of 4.0 mm, exhibiting good optical performance, as well as characteristics of low distortion, high magnification, and long working distance.

[0290] (Sixth Implementation Method)

[0291] The sixth embodiment is basically the same as the first embodiment, and the symbols have the same meanings as the first embodiment. Only the differences are listed below.

[0292] In this embodiment, an aperture S1 is provided between the second lens L2 and the third lens L3. The axial distance from the image side of the second lens L2 to the aperture S1 is 6.944 mm, and the axial distance from the aperture S1 to the object side of the third lens L3 is 2.811 mm.

[0293] In this embodiment, the image-side surface of the first lens L1 is convex at the paraxial position, and the object-side surface of the eighth lens L8 is concave at the paraxial position.

[0294] Table 6 shows the design data of the optical lens 60 according to the sixth embodiment of the present invention.

[0295] Table 6

[0296]

[0297]

[0298] Figure 22 , Figure 23 Axial aberration and magnification chromatic aberration are shown respectively after light with wavelengths of 632nm, 546nm and 486nm passes through the optical lens 30 of the sixth embodiment. Figure 24 This illustrates the field curvature and distortion of light with a wavelength of 546 nm after passing through the optical lens 50 of the sixth embodiment. Figure 24 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0299] Table 7, which appears later, shows the values ​​corresponding to the various numerical values ​​and the parameters specified in the conditional expressions for each of Examples 1, 2, 3, 4, 5, and 6.

[0300] As shown in Table 7, the sixth embodiment satisfies all the conditional expressions.

[0301] In this embodiment, the optical lens has an entrance pupil diameter of 23.000 mm, a numerical aperture of 0.32, and a full field-of-view image height of 4.0 mm, exhibiting good optical performance, as well as characteristics of low distortion, high magnification, and long working distance.

[0302] Table 7

[0303]

[0304]

[0305] The above description is merely an embodiment of the present invention. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of the present invention, but these improvements all fall within the protection scope of the present invention.

Claims

1. An optical lens, characterized in that, The optical lens has 12 lenses, which are arranged in the following order from the object side to the image side: first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, ninth lens, tenth lens, eleventh lens and twelfth lens. The first lens has positive refractive power, and its object-side surface is convex paraxially. The second lens has negative refractive power, and both its object-side and image-side surfaces are concave paraxially. The third lens has negative refractive power, and both its object-side and image-side surfaces are concave paraxially. The fourth lens has positive refractive power, and both its object-side and image-side surfaces are convex paraxially. The fifth lens has negative refractive power, and both its object-side and image-side surfaces are concave paraxially. The sixth lens has positive refractive power, and both its object-side and image-side surfaces are convex paraxially. The seventh lens has positive refractive power, and both its object-side and image-side surfaces are convex at the paraxial position. The eighth lens has negative refractive power, and both its image-side and image-side surfaces are concave at the paraxial position. The ninth lens has positive refractive power, and both its object-side and image-side surfaces are convex at the paraxial position. The tenth lens has positive refractive power, and both its object-side and image-side surfaces are convex at the paraxial position. The eleventh lens has negative refractive power, and both its object-side and image-side surfaces are concave at the paraxial position. The twelfth lens has positive refractive power, and both its object-side and image-side surfaces are convex at the paraxial position. The optical lens has a focal length of f, the combined focal length of the fifth and sixth lenses is f56, the on-axis thickness of the fifth lens is d9, the on-axis thickness of the sixth lens is d11, the focal length of the seventh lens is f7, the combined focal length of the tenth and eleventh lenses is f10-11, the focal length of the twelfth lens is f12, the working distance of the optical lens is WD, and the numerical aperture of the optical lens is NA, satisfying the following relationship: -0.80≤f12 / f10_11≤-0.50; 0.80≤f7 / f≤1.80; -83.00≤f56 / (d9+d11)≤-4.00; 0.40≤NA f / WD≤0.60。 2. The optical lens according to claim 1, characterized in that, The fourth lens has an axial thickness d7, and the axial distance from the image side of the fourth lens to the object side of the fifth lens is d8, satisfying the following relationship: 1.00≤d7 / d8≤22.

50.

3. The optical lens according to claim 1, characterized in that, The focal length of the first lens is f1, the central radius of curvature of the object side of the first lens is R1, the central radius of curvature of the image side of the first lens is R2, the axial thickness of the first lens is d1, and the total optical length of the optical lens is TTL, satisfying the following relationship: 0.98 ≤ f1 / f ≤ 1.58; -1.26≤(R1+R2) / (R1-R2)≤-0.83; 0.02≤d1 / TTL≤0.

09.

4. The optical lens according to claim 1, characterized in that, The focal length of the second lens is f2, the central radius of curvature of the object-side surface of the second lens is R3, the central radius of curvature of the image-side surface of the second lens is R4, the axial thickness of the second lens is d3, and the total optical length of the optical lens is TTL, satisfying the following relationship: -1.10≤f² / f≤-0.80; 0.78≤(R3+R4) / (R3-R4)≤0.96; 0.00≤d3 / TTL≤0.

03.

5. The optical lens according to claim 1, characterized in that, The third lens has a focal length of f3, a central radius of curvature of R5 on the object side, a central radius of curvature of R6 on the image side, an axial thickness of d5, and a total optical length of TTL, satisfying the following relationship: -0.75≤f3 / f≤-0.56; -0.85≤(R5+R6) / (R5-R6)≤-0.30; 0.00≤d5 / TTL≤0.

03.

6. The optical lens according to claim 1, characterized in that, The fourth lens has a focal length of f4, a central radius of curvature of R7 on the object side, a central radius of curvature of R8 on the image side, an axial thickness of d7, and a total optical length of TTL, satisfying the following relationship: 0.62≤f4 / f≤0.95; 0.16≤(R7+R8) / (R7-R8)≤1.00; 0.04≤d7 / TTL≤0.

10.

7. The optical lens according to claim 1, characterized in that, The fifth lens has a focal length of f5, a central radius of curvature of the object side of the fifth lens of R9, a central radius of curvature of the image side of the fifth lens of R10, and a total optical length of TTL, satisfying the following relationship: -1.20≤f5 / f≤-0.55; -0.41≤(R9+R10) / (R9-R10)≤-0.24; 0.00≤d9 / TTL≤0.

03.

8. The optical lens according to claim 1, characterized in that, The sixth lens has a focal length of f6, a central radius of curvature of the object-side surface of the sixth lens of R11, a central radius of curvature of the image-side surface of the sixth lens of R12, and a total optical length of TTL, satisfying the following relationship: 1.11≤f6 / f≤1.45; -0.10≤(R11+R12) / (R11-R12)≤0.25; 0.05≤d11 / TTL≤0.

10.

9. The optical lens according to claim 1, characterized in that, The seventh lens has a central radius of curvature of R13 on the object side and R14 on the image side. The seventh lens has an axial thickness of d13, and the total optical length of the optical lens is TTL, satisfying the following relationship: -0.60≤(R13+R14) / (R13-R14)≤0.15; 0.04≤d13 / TTL≤0.

07.

10. The optical lens according to claim 1, characterized in that, The eighth lens has a focal length of f8, a central radius of curvature of R15 on the object side, a central radius of curvature of R16 on the image side, an axial thickness of d15, and a total optical length of TTL, satisfying the following relationship: -3.10≤f8 / f≤-0.69; 0.14≤(R15+R16) / (R15-R16)≤3.00; 0.00≤d15 / TTL≤0.

04.

11. The optical lens according to claim 1, characterized in that, The ninth lens has a focal length of f9, a central radius of curvature of R17 on the object side, a central radius of curvature of R18 on the image side, an axial thickness of d17, and a total optical length of TTL, satisfying the following relationship: 0.84≤f9 / f≤1.79; -0.90≤(R17+R18) / (R17-R18)≤-0.14; 0.08≤d17 / TTL≤0.

14.

12. The optical lens according to claim 1, characterized in that, The tenth lens has a focal length of f10, a central radius of curvature of the object side of the tenth lens of R19, a central radius of curvature of the image side of the tenth lens of R20, an axial thickness of d19, and a total optical length of TTL, satisfying the following relationship: 0.90≤f10 / f≤1.15; -0.45≤(R19+R20) / (R19-R20)≤0.00; 0.06≤d19 / TTL≤0.

15.

13. The optical lens according to claim 1, characterized in that, The eleventh lens has a focal length of f11, a central radius of curvature of R21 on the object side, a central radius of curvature of R22 on the image side, an axial thickness of d21, and a total optical length of TTL, satisfying the following relationship: -0.69≤f11 / f≤-0.50; 0.35≤(R21+R22) / (R21-R22)≤0.60; 0.00≤d21 / TTL≤0.

03.

14. The optical lens according to claim 1, characterized in that, The twelfth lens has a focal length of f12, a central radius of curvature of R23 on the object side, a central radius of curvature of R24 on the image side, an axial thickness of d23, and a total optical length of TTL, satisfying the following relationship: 0.93 ≤ f12 / f ≤ 1.33; -1.35≤(R23+R24) / (R23-R24)≤-0.65; 0.04≤d23 / TTL≤0.

15.

15. The optical lens according to claim 1, characterized in that, The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens, and the twelfth lens are all made of glass.

Images