Optical imaging lens

Abstract

To provide an optical imaging lens which has excellent optical performance while satisfying the design requirements of a large aperture and an ultra-wide angle.SOLUTION: The optical imaging lens includes, in order from an objective side surface to an image side: a first lens L1 having negative refractive power; a second lens L2 having negative refractive power; a third lens L3 having positive refractive power; a fourth lens L4 having positive refractive power; a fifth lens L5 having negative refractive power; and a sixth lens L6 having positive refractive power. The following relationship expressions are satisfied: 1.70≤n1≤2.20; -2.30≤f2 / f≤-1.60; -1.80≤R11 / R12≤-0.50; 0.10≤f3 / f4≤0.50; 8.00≤d5 / d6≤30.00.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to the field of optical lenses, and in particular to an optical imaging lens applied to imaging devices such as portable smart devices such as smartphones and digital cameras, monitors, PC lenses, and vehicle-mounted camera lenses. [Background technology]

[0002] In recent years, with the rise of smart devices, there has been an increasing demand for miniaturized imaging lenses. The photosensitive elements of general imaging lenses are limited to charge coupled devices (CCD) or complementary metal-oxide semiconductor sensors (CMOS sensors). In addition to the miniaturization of the pixel size of the photosensitive elements, the current trend in smart devices is to develop features such as slimmer appearances, and so miniaturized imaging lenses with good imaging quality are currently mainstream in the market.

[0003] In the past, the lenses installed in mobile phone cameras were mainly three, four or five lens structures in order to obtain better imaging quality. However, with the development of technology and the diversification of user needs, the pixel area of ​​the photosensitive element has been reduced, and the requirements for the imaging quality of the system have been continuously improved, so that six-lens structures have gradually appeared in lens design. Although the general six-lens structure has good optical performance, its optical focal length, lens spacing and lens shape settings are still unreasonable to a certain extent. As a result, the lens structure cannot meet the design requirements of large aperture and ultra-wide angle while having good optical performance. Summary of the Invention

[0004] In view of the above problems, an object of the present invention is to provide an optical imaging lens that has good optical performance and satisfies the design requirements for a large aperture and an ultra-wide angle.

[0005] In order to solve the above technical problems, one embodiment of the present invention provides an optical imaging lens, which includes, in order from the object side to the image side, a first lens having negative refractive power, a second lens having negative refractive power, a third lens having positive refractive power, a fourth lens having positive refractive power, a fifth lens having negative refractive power, and a sixth lens having positive refractive power; The refractive index of the first lens is n1, the focal length of the optical imaging lens is f, the focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the central radius of curvature of the object side surface of the sixth lens is R11, the central radius of curvature of the image side surface of the sixth lens is R12, the axial thickness of the third lens is d5, and the axial distance from the image side surface of the third lens to the object side surface of the fourth lens is d6, which satisfy the following relational expressions: 1.70≦n1≦2.20 -2.30≦f2 / f≦-1.60 -1.80≦R11 / R12≦-0.50 0.10≦f3 / f4≦0.50 8.00≦d5 / d6≦30.00

[0006] Preferably, a composite focal length of the fourth lens and the fifth lens is f45, an axial thickness of the fourth lens is d7, an axial distance from the image side surface of the fourth lens to the object side surface of the fifth lens is d8, and an axial thickness of the fifth lens is d9, and the following relational expression is satisfied: -20.00≦f45 / (d7+d8+d9)≦-4.00

[0007] Preferably, the third lens has a refractive index n3 and satisfies the following relation: 1.70≦n3≦2.20

[0008] Preferably, an object side surface of the first lens is a convex surface at a paraxial position, and an image side surface of the first lens is a concave surface at a paraxial position, The total optical length of the optical imaging lens is TTL, the focal length of the first lens is f1, the central radius of curvature of the object side surface of the first lens is R1, the central radius of curvature of the image side surface of the first lens is R2, and the axial thickness of the first lens is d1, and the following relational expression is satisfied: -11.38≦f1 / f≦-2.62 0.83≦(R1+R2) / (R1-R2)≦2.81 0.03≦d1 / TTL≦0.29

[0009] Preferably, the object side surface of the second lens is concave at a paraxial position, and the image side surface of the second lens is concave at a paraxial position, a central radius of curvature of the object side surface of the second lens is R3, a central radius of curvature of the image side surface of the second lens is R4, and an axial thickness of the second lens is d3, which satisfy the following relational expression: 0.04≦(R3+R4) / (R3-R4)≦0.92 0.02≦d3 / TTL≦0.08

[0010] Preferably, the total optical length of the optical imaging lens is TTL, the object side surface of the third lens is a convex surface at a paraxial position, and the image side surface of the third lens is a convex surface at a paraxial position; The third lens has a central radius of curvature of an object side surface thereof that is R5, and a central radius of curvature of an image side surface thereof that is R6, which satisfy the following relational expression: 1.11≦f3 / f≦6.09 -0.69≦(R5+R6) / (R5-R6)≦-0.17 0.09≦d5 / TTL≦0.37

[0011] Preferably, an object side surface of the fourth lens is a convex surface at a paraxial position, and an image side surface of the fourth lens is a convex surface at a paraxial position, a central radius of curvature of an object side surface of the fourth lens is R7, a central radius of curvature of an image side surface of the fourth lens is R8, and an axial thickness of the fourth lens is d7, which satisfy the following relational expressions: 2.71≦f4 / f≦32.42 -0.40≦(R7+R8) / (R7-R8)≦0.58 0.02≦d7 / TTL≦0.13

[0012] Preferably, an object side surface of the fifth lens is concave at a paraxial position, and an image side surface of the fifth lens is concave at a paraxial position, The total optical length of the optical imaging lens is TTL, the focal length of the fifth lens is f5, the central radius of curvature of the object side surface of the fifth lens is R9, the central radius of curvature of the image side surface of the fifth lens is R10, and the on-axial thickness of the fifth lens is d9, which satisfy the following relational expressions: -9.35≦f5 / f≦-1.54 -0.74≦(R9+R10) / (R9-R10)≦0.31 0.01≦d9 / TTL≦0.06

[0013] Preferably, an object side surface of the sixth lens is a convex surface at a paraxial position, and an image side surface of the sixth lens is a convex surface at a paraxial position, The total optical length of the optical imaging lens is TTL, the focal length of the sixth lens is f6, and the axial thickness of the sixth lens is d11, which satisfies the following relation: 0.99≦f6 / f≦3.98 0.04≦d11 / TTL≦0.21

[0014] Preferably, an aperture value of said optical imaging lens is Fno, and a viewing angle of said optical imaging lens is FOV, which satisfies the following relation: Fno=Fno / FOV. Fno≦2.00 FOV≧196.00°

[0015] Preferably, the first lens is made of a glass material.

[0016] Preferably, the third lens is made of a glass material.

[0017] The beneficial effects of the present invention are that the optical imaging lens according to the present invention can have good optical performance and large aperture / ultra-wide angle characteristics by limiting the refractive index of the first lens, the ratio between the focal length of the second lens and the focal length of the optical imaging lens, the central radius of curvature of the object-side surface of the sixth lens and the central radius of curvature of the image-side surface of the sixth lens, the ratio between the focal length of the third lens and the focal length of the fourth lens, and the ratio between the axial thickness of the third lens and the axial distance from the image-side surface of the third lens to the object-side surface of the fourth lens, and is particularly suitable for mobile phone imaging lens parts, web camera lenses, and car-mounted camera lenses constituted by imaging elements such as high-pixel CCD and CMOS. [Brief description of the drawings]

[0018] In order to more clearly describe the technical solutions in the embodiments of the present invention, the following briefly describes the drawings that need to be used in the description of the embodiments. It should be noted that the drawings in the following description are only some embodiments of the present invention. Those skilled in the art can obtain other drawings based on these drawings without creative work.

[0019] [Figure 1] 1 is a schematic diagram illustrating the configuration of an optical imaging lens according to Embodiment 1. [Diagram 2] FIG. 2 is a schematic diagram of axial aberration of the optical imaging lens shown in FIG. 1; [Diagram 3] FIG. 2 is a schematic diagram of magnification aberration of the optical imaging lens shown in FIG. [Figure 4] FIG. 2 is a schematic diagram of the field curvature and distortion of the optical imaging lens shown in FIG. 1. [Diagram 5] FIG. 11 is a schematic diagram showing the configuration of an optical imaging lens according to a second embodiment. [Figure 6] FIG. 6 is a schematic diagram of axial aberration of the optical imaging lens shown in FIG. 5. [Figure 7] FIG. 6 is a schematic diagram of magnification aberration of the optical imaging lens shown in FIG. 5. [Figure 8] FIG. 6 is a schematic diagram of the field curvature and distortion of the optical imaging lens shown in FIG. 5. [Figure 9]FIG. 11 is a schematic diagram showing the configuration of an optical imaging lens according to a third embodiment. [Figure 10] FIG. 10 is a schematic diagram of axial aberration of the optical imaging lens shown in FIG. [Figure 11] FIG. 10 is a schematic diagram of magnification aberration of the optical imaging lens shown in FIG. [Figure 12] FIG. 10 is a schematic diagram of the field curvature and distortion of the optical imaging lens shown in FIG. [Figure 13] FIG. 11 is a schematic diagram showing the configuration of an optical imaging lens according to Embodiment 4. [Figure 14] FIG. 14 is a schematic diagram of axial aberration of the optical imaging lens shown in FIG. [Figure 15] FIG. 14 is a schematic diagram of magnification aberration of the optical imaging lens shown in FIG. [Figure 16] FIG. 14 is a schematic diagram of the field curvature and distortion of the optical imaging lens shown in FIG. 13. [Figure 17] FIG. 11 is a schematic diagram showing the configuration of an optical imaging lens according to Embodiment 5. [Figure 18] FIG. 18 is a schematic diagram of axial aberration of the optical imaging lens shown in FIG. 17. [Figure 19] FIG. 18 is a schematic diagram of magnification aberration of the optical imaging lens shown in FIG. [Figure 20] FIG. 18 is a schematic diagram of the field curvature and distortion of the optical imaging lens shown in FIG. 17. [Figure 21] FIG. 13 is a schematic diagram illustrating the configuration of an optical imaging lens according to a comparative embodiment. [Figure 22] FIG. 22 is a schematic diagram of axial aberration of the optical imaging lens shown in FIG. 21. [Diagram 23] FIG. 22 is a schematic diagram of magnification aberration of the optical imaging lens shown in FIG. 21. [Figure 24] FIG. 22 is a schematic diagram of the field curvature and distortion of the optical imaging lens shown in FIG. 21. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] In order to make the objectives, technical means and advantages of the present invention clearer, various embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that those skilled in the art can understand that many technical details are proposed in various embodiments of the present invention to allow readers to better understand the present invention. However, even without these technical details and various modifications and changes based on the following embodiments, the technical solution claimed to be protected by the present invention can be realized.

[0021] (First embodiment) With reference to the accompanying drawings, the present invention provides an optical imaging lens 10. Fig. 1 shows an optical imaging lens 10 according to a first embodiment of the present invention, which includes six lenses. Specifically, the optical imaging lens 10 includes, in order from the object side to the image side, a first lens L1, a second lens L2, a third lens L3, an aperture S1, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an image plane Si. In addition, optical elements such as a first optical filter GF1 and a second optical filter GF2 may be provided between the sixth lens L6 and the image plane Si.

[0022] In this embodiment, the first lens L1 is made of a glass material, the second lens L2 is made of a plastic material, the third lens L3 is made of a glass material, the fourth lens L4 is made of a plastic material, the fifth lens L5 is made of a plastic material, and the sixth lens L6 is made of a plastic material.

[0023] In this embodiment, the refractive index of the first lens L1 is defined as n1, and the following relational expression is satisfied. Using a high refractive index material for the first lens L1 is advantageous for reducing the front end aperture of the optical imaging lens 10 and improving the imaging quality. 1.70≦n1≦2.20

[0024] In addition, the focal length of the optical imaging lens 10 is defined as f, the focal length of the second lens L2 is defined as f2, and the second lens L2 has negative refractive power and satisfies the following relation: By defining the ratio of the focal lengths of the second lens L2 and the optical imaging lens 10, the optical focal lengths of the system can be reasonably allocated, thereby achieving both better imaging quality and low sensitivity. -2.30≦f2 / f≦-1.60

[0025] The radius of curvature of the center of the object side surface of the sixth lens L6 is defined as R11, and the radius of curvature of the center of the image side surface of the sixth lens L6 is defined as R12, and the following relational expression is satisfied. By defining the shape of the sixth lens, the refraction degree of light passing through the lens within the range of this relational expression can be alleviated, and chromatic aberration can be efficiently corrected to |LC|≦5.m. -1.80≦R11 / R12≦-0.50

[0026] The focal length of the third lens L3 is defined as f3, and the focal length of the fourth lens L4 is defined as f4, and the following relation is satisfied: By defining the ratio of the focal lengths of the third lens and the fourth lens, and reasonably allocating the focal lengths of the system, the amount of field curvature of the system can be effectively balanced, so that the field curvature offset of the central field is less than 0.03 mm. 0.10≦f3 / f4≦0.50

[0027] The axial thickness of the third lens L3 is defined as d5, and the axial distance from the image side surface of the third lens L3 to the object side surface of the fourth lens L4 is defined as d6, and the following relational expression is satisfied. By specifying the ratio between the axial thickness of the third lens and the axial distance from the image side surface of the third lens to the object side surface of the fourth lens, the total length of the optical system can be shortened within the range of this relation. 8.00≦d5 / d6≦30.00

[0028] When the refractive index of the first lens L1 of the optical imaging lens 10 according to this embodiment, the ratio between the focal length of the second lens L2 and the focal length of the optical imaging lens 10, the ratio between the central radius of curvature of the object side surface of the sixth lens L6 and the central radius of curvature of the image side surface of the sixth lens L6, the ratio between the focal length of the third lens L3 and the focal length of the fourth lens L4, and the ratio between the axial thickness of the third lens L3 and the axial distance from the image side surface of the third lens L3 to the object side surface of the fourth lens L4 all satisfy the above relational expressions, the optical imaging lens 10 can have good optical performance and large aperture / ultra-wide angle characteristics and is particularly suitable for mobile phone imaging lens parts, webcam lenses, and car-mounted camera lenses constituted by imaging elements such as high-pixel CCDs and CMOSs.

[0029] In this embodiment, more preferably, when the composite focal length of the fourth lens L4 and the fifth lens L5 is f45, the axial thickness of the fourth lens L4 is d7, the axial distance from the image side surface of the fourth lens L4 to the object side surface of the fifth lens L5 is d8, and the axial thickness of the fifth lens is d9, the following relational expression is satisfied: -20.00≦f45 / (d7+d8+d9)≦-4.00. If the relational expression is within the range, it is considered effective to effectively shorten the total optical length while maintaining a negative refractive power sufficient for the combined lens to correct off-axis aberrations at the image side end.

[0030] In this embodiment, more preferably, the refractive index of the third lens L3 is n3, and the following relational expression is satisfied. By specifying that the third lens L3 is made of a high refractive index material, it is possible to contribute to a smooth transition of light and improve image quality. 1.70≦n3≦2.20

[0031] In this embodiment, the object side surface of the first lens L1 is a convex surface at the paraxial position, the image side surface of the first lens L1 is a concave surface at the paraxial position, and the first lens L1 has negative refractive power.

[0032] The focal length of the first lens L1 is defined as f1, and the following relational expression is satisfied: -11.38≦f1 / f≦-2.62. The negative refractive power of the first lens L1 is specified. If the upper limit is exceeded, it contributes to the development of ultra-thin lenses, but the negative refractive power of the first lens L1 is too strong, making it difficult to compensate for aberrations and the like, and does not contribute to the development of wide-angle lenses. Conversely, if the lower limit is exceeded, the negative refractive power of the first lens L1 becomes too weak, making it difficult to develop ultra-thin lenses. Preferably, -7.11≦f1 / f≦-3.27.

[0033] The central radius of curvature R1 of the object side surface of the first lens L1 and the central radius of curvature R2 of the image side surface of the first lens L1 satisfy the following relation: 0.83≦(R1+R2) / (R1-R2)≦2.81. By rationally controlling the shape of the first lens L1, the spherical aberration of the system caused by the first lens L1 can be efficiently corrected. Preferably, 1.32≦(R1+R2) / (R1-R2)≦2.25.

[0034] The optical imaging lens 10 has an optical total length of TTL, and an axial thickness of the first lens L1 of d1, which satisfies the following relationship: 0.03≦d1 / TTL≦0.29. Such control can contribute to realizing an ultra-thin structure. Preferably, 0.05≦d1 / TTL≦0.23.

[0035] In this embodiment, the object side surface of the second lens L2 is concave at the paraxial position, and the image side surface is concave at the paraxial position.

[0036] The radius of curvature R3 of the center of the object side surface of the second lens L2 and the radius of curvature R4 of the center of the image side surface of the second lens L2 satisfy the following relation: 0.04≦(R3+R4) / (R3-R4)≦0.92. By defining the shape of the second lens L2, if it is within this relation, it is advantageous to correct the problem of axial chromatic aberration as it develops toward the ultra-thin wide-angle side. Preferably, 0.07≦(R3+R4) / (R3-R4)≦0.74.

[0037] The axial thickness of the second lens L2 is d3, which satisfies the following relation: 0.02≦d3 / TTL≦0.08. This control is advantageous for achieving an ultra-thin structure. Preferably, 0.03≦d3 / TTL≦0.06.

[0038] In this embodiment, the object side surface of the third lens L3 is a convex surface at the paraxial position, the image side surface is a convex surface at the paraxial position, and the third lens L3 has positive refractive power.

[0039] The focal length of the third lens L3 satisfies the following relation: 1.11≦f3 / f≦6.09. By appropriately allocating the optical focal length, it is possible to achieve both better imaging quality and low sensitivity. Preferably, 1.78≦f3 / f≦4.87.

[0040] If the radius of curvature of the center of the object side surface of the third lens L3 is R5 and the radius of curvature of the center of the image side surface of the third lens L3 is R6, the following relational expression is satisfied: -0.69≦(R5+R6) / (R5-R6)≦-0.17. By defining the shape of the third lens L3, it is advantageous to the molding of the third lens L3, and molding defects and stress due to the surface curvature of the third lens L3 being too large can be avoided. Also, it is preferable that -0.43≦(R5+R6) / (R5-R6)≦-0.21.

[0041] The axial thickness of the third lens L3 satisfies the following relation: 0.09≦d5 / TTL≦0.37. Such control is advantageous for achieving an ultra-thin structure. Also, preferably, 0.14≦d5 / TTL≦0.30.

[0042] In this embodiment, the object side surface of the fourth lens L4 is a convex surface at the paraxial position, the image side surface is a convex surface at the paraxial position, and the fourth lens L4 has positive refractive power.

[0043] The focal length of the fourth lens L4 satisfies the following relationship: 2.71≦f4 / f≦32.42. A proper distribution of the optical focal lengths can achieve a system with better imaging quality and lower sensitivity. Preferably, 4.34≦f4 / f≦25.93.

[0044] When the radius of curvature of the center of the object side surface of the fourth lens L4 is R7 and the radius of curvature of the center of the image side surface of the fourth lens L4 is R8, the following relational expression is satisfied: -0.40≦(R7+R8) / (R7-R8)≦0.58. By defining the shape of the fourth lens L4, when it is within the range of this relational expression, it is effective to correct problems such as off-axis aberrations in the field of view that accompany the development of ultra-thin and wide-angle lenses. Preferably, -0.25≦(R7+R8) / (R7-R8)≦0.47.

[0045] The axial thickness of the fourth lens L4 satisfies the following relation: 0.02≦d7 / TTL≦0.13. This control is advantageous for achieving an ultra-thin structure. Also, preferably, 0.03≦d7 / TTL≦0.10.

[0046] In this embodiment, the object side surface of the fifth lens L5 is concave at the paraxial position, the image side surface is concave at the paraxial position, and the fifth lens L5 has negative refractive power.

[0047] The focal length of the fifth lens L5 is defined as f5, and the following relation is satisfied: -9.35≦f5 / f≦-1.54. By limiting the fifth lens L5, the optical angle of the imaging lens can be effectively flattened and the tolerance sensitivity can be reduced. Also, preferably, -5.85≦f5 / f≦-1.92.

[0048] The radius of curvature of the center of the object side surface of the fifth lens L5 is R9, and the radius of curvature of the center of the image side surface of the fifth lens L5 is R10, and the following relational expression is satisfied: -0.74≦(R9+R10) / (R9-R10)≦0.31. By defining the shape of the fifth lens L5, when it is within the range of this relational expression, it is effective to correct problems such as off-axis aberrations of the field angle with the development of ultra-thin and wide-angle lenses. Also, preferably, -0.46≦(R9+R10) / (R9-R10)≦0.25.

[0049] The axial thickness of the fifth lens L5 satisfies the following relation: 0.01≦d9 / TTL≦0.06. Such control is advantageous for achieving an ultra-thin structure. Preferably, 0.01≦d9 / TTL≦0.04.

[0050] In this embodiment, the object side surface of the sixth lens L6 is a convex surface at the paraxial position, the image side surface is a convex surface at the paraxial position, and the sixth lens L6 has positive refractive power.

[0051] The focal length of the sixth lens L6 is defined as f6, and the following relation is satisfied: 0.99≦f6 / f≦3.98. A proper distribution of the optical focal length can realize a system with better imaging quality and lower sensitivity. Also, preferably, 1.58≦f6 / f≦3.19.

[0052] The axial thickness of the sixth lens L6 is d11, which satisfies the following relationship: 0.04≦d11 / TTL≦0.21. This control is advantageous for achieving an ultra-thin structure. Also, preferably, 0.07≦d11 / TTL≦0.16.

[0053] In this embodiment, the total optical length TTL of the optical imaging lens 10 is 23.24 mm or less, which is advantageous for realizing an ultra-thin structure. Also, preferably, TTL is 22.18 mm or less.

[0054] According to such a design, the total optical length TTL of the optical imaging lens 10 can be made as short as possible, and the feature of miniaturization can be maintained.

[0055] Furthermore, the aperture value (aperture F number) of the optical imaging lens is Fno, that is, the ratio of the effective focal length to the entrance pupil diameter, and the following relational expression is satisfied: Fno≦2.00. This contributes to realizing a large aperture and improves imaging performance. Furthermore, the field of view of the optical imaging lens is FOV, and the following relational expression is satisfied: FOV≧196.00°. This is advantageous for realizing a wide angle. That is, when the above relational expression is satisfied, the optical imaging lens 10 can achieve the design requirements of a large aperture and an ultra-wide angle while having good optical imaging performance. The optical imaging lens 10 is particularly suitable for mobile phone imaging lens parts, web camera lenses, and vehicle-mounted camera lenses, which are composed of imaging elements such as CCDs and CMOSs ​​for high pixels.

[0056] The optical imaging lens 10 of the present invention will be described below with reference to examples. The symbols used in each example are as follows. The focal length, axial distance, central radius of curvature, axial thickness, inflection point position, and stationary point position are all in mm.

[0057] TTL: Total optical length (the axial distance from the object side of the first lens L1 to the image plane Si), in mm;

[0058] Aperture value Fno: It is the ratio between the effective focal length of the optical imaging lens and the entrance pupil diameter.

[0059] Preferably, the object side and / or image side surface of the lens may be provided with an inflection point and / or a stationary point to meet high quality imaging requirements, and specific embodiments will be described below.

[0060] Tables 1 and 2 are tables showing design data of the optical imaging lens 10 according to the first embodiment of the present invention.

[0061] JPEG2024177035000002.jpg113152

[0062] Here, the meanings of the symbols are as follows: S1: aperture; R: central radius of curvature at the center of the optical surface; R1: central radius of curvature of the object side of the first lens L1; R2: central radius of curvature of the image side of the first lens L1; R3: the central radius of curvature of the object side of the second lens L2; R4: central radius of curvature of the image side of the second lens L2; R5: the central radius of curvature of the object side of the third lens L3; R6: central radius of curvature of the image side of the third lens L3; R7: the central radius of curvature of the object side of the fourth lens L4; R8: central radius of curvature of the image side of the fourth lens L4; R9: the central radius of curvature of the object side of the fifth lens L5; R10: central radius of curvature of the image side of the fifth lens L5; R11: the central radius of curvature of the object side of the sixth lens L6; R12: Radius of central curvature of the image side of the sixth lens L6; R13: the central curvature radius of the object side of the first optical filter GF1; R14: the central radius of curvature of the image side of the first optical filter GF1; R15: the central curvature radius of the object side of the second optical filter GF2; R16: the central radius of curvature of the image side of the second optical filter GF2; d: Axial thickness of the lens and axial distance between the lenses; d0: the axial distance from the aperture stop S1 to the object side of the first lens L1; d1: axial thickness of the first lens L1; d2: the axial distance from the image side surface of the first lens L1 to the object side surface of the second lens L2; d3: axial thickness of the second lens L2; d4: the axial distance from the image side surface of the second lens L2 to the object side surface of the third lens L3; d5: Axial thickness of the third lens L3; d6: the axial distance from the image side surface of the third lens L3 to the object side surface of the fourth lens L4; d7: Axial thickness of the fourth lens L4; d8: the axial distance from the image side surface of the fourth lens L4 to the object side surface of the fifth lens L5; d9: Axial thickness of the fifth lens L5; d10: the axial distance from the image side surface of the fifth lens L5 to the object side surface of the sixth lens L6; d11: Axial thickness of the sixth lens L6; d12: the axial distance from the image side surface of the sixth lens L6 to the object side surface of the seventh lens L7; d13: the axial thickness of the first optical filter GF1; d14: the axial distance from the image side surface of the first optical filter GF1 to the object side surface of the optical filter GF; d15: the on-axis thickness of the second optical filter GF2; d16: the axial distance from the image side surface of the second optical filter GF2 to the object side surface of the optical filter GF; nd: refractive index of d line (d line is green light with a wavelength of 550 nm); nd1: refractive index of the first lens L1 at the d line; nd2: refractive index of the second lens L2 at the d line; nd3: refractive index of the third lens L3 at the d line; nd4: refractive index of the d line of the fourth lens L4; nd5: refractive index of the d line of the fifth lens L5; nd6: refractive index of the d line of the sixth lens L6; ndg1: refractive index of the d line of the first optical filter GF1; ndg2: refractive index of the d line of the second optical filter GF2; vd: Abbe number; v1: Abbe number of the first lens L1; v2: Abbe number of the second lens L2; v3: Abbe number of the third lens L3; v4: Abbe number of the fourth lens L4; v5: Abbe number of the fifth lens L5; v6: Abbe number of the sixth lens L6; vg1: Abbe number of the first optical filter GF1; vg2: Abbe number of the second optical filter GF2.

[0063] Table 2 shows the aspheric data of each lens of the optical imaging lens 10 according to the first embodiment of the present invention.

[0064] JPEG2024177035000003.jpg188165

[0065] For convenience, the aspheric surface of each lens surface is expressed by the following formula (1). However, the present invention is not limited to the polynomial form of the aspheric surface expressed by this formula (1).

[0066] [Formula 1] z=(cr 2 ) / {1+[1-(k+1)(c 2 r 2 )] 1 / 2}+A4r 4 +A6r 6 +A8r 8 +A10r 10 +A12r 12 +A14r 14 +A16r 16 +A18r 18 +A20r 20 (1)

[0067] Here, k is the conic coefficient, A4, A6, A8, A10, A12, A14, A16, A18, and A20 are aspheric coefficients, c is the curvature at the center of the optical surface, r is the perpendicular distance between a point on the aspheric curve and the optical axis, and z is the aspheric depth (the perpendicular distance between the point on the aspheric surface where the optical axis is r and the facet that touches the vertex on the aspheric optical axis).

[0068] Table 3 shows design data of the inflection point of each lens in the optical imaging lens 10 according to the first embodiment of the present invention. Here, P1R1 and P1R2 represent the object side surface and the image side surface of the first lens L1, P2R1 and P2R2 represent the object side surface and the image side surface of the second lens L2, P3R1 and P3R2 represent the object side surface and the image side surface of the third lens L3, P4R1 and P4R2 represent the object side surface and the image side surface of the fourth lens L4, P5R1 and P5R2 represent the object side surface and the image side surface of the fifth lens L5, and P6R1 and P6R2 represent the object side surface and the image side surface of the sixth lens L6. The data corresponding to the "inflection point position" column is the vertical distance from the inflection point set on the surface of each lens to the optical axis of the optical imaging lens 10.

[0069] JPEG2024177035000004.jpg83125

[0070] 2 and 3 are schematic diagrams showing axial aberration and lateral chromatic aberration after light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm passes through the optical imaging lens 10 of the first embodiment. Fig. 4 is a schematic diagram showing field curvature and distortion after light with wavelength of 550 nm passes through the optical imaging lens 10 of the first embodiment. In Fig. 4, field curvature S is the field curvature in the axial direction, and T is the field curvature in the meridional direction.

[0071] Table 19, which will be shown later, shows various numerical values ​​in each of the first, second, third, fourth, fifth, and comparative examples, and values ​​corresponding to the parameters defined in the conditional expressions (relational expressions).

[0072] As shown in Table 19, the first embodiment satisfies each of the conditional expressions.

[0073] In this embodiment, the entrance pupil diameter EMPD of the optical imaging lens 10 is 0.734 mm, the full-field image height IH of the optical imaging lens 10 is 2.883 mm, the diagonal field of view angle FOV of the optical imaging lens 10 is 196.00°, and the aperture value Fno of the optical imaging lens 10 is 2.00, so that the optical imaging lens 10 meets the design requirements of large aperture and ultra-wide angle, the on-axis and off-axis chromatic aberrations are properly corrected, and it has excellent optical properties.

[0074] Second embodiment The second embodiment is basically the same as the first embodiment, and the symbols have the same meanings as those in the first embodiment. Please refer to Fig. 5 for the structure of the optical imaging lens 20 of the second embodiment. Only the differences are listed below.

[0075] Tables 4 and 5 are tables showing design data of the optical imaging lens 20 according to the second embodiment of the present invention.

[0076] JPEG2024177035000005.jpg113149

[0077] Table 5 shows the aspheric data of each lens in the optical imaging lens 20 according to the second embodiment of the present invention.

[0078] JPEG2024177035000006.jpg188165

[0079] Table 6 shows the design data of the inflection point of each lens in the optical imaging lens 20 according to the second embodiment of the present invention.

[0080] JPEG2024177035000007.jpg83123

[0081] 6 and 7 are schematic diagrams showing axial aberration and lateral chromatic aberration after light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm passes through the optical imaging lens 20 of the second embodiment. Fig. 8 is a schematic diagram showing field curvature and distortion after light with wavelength of 550 nm passes through the optical imaging lens 20 of the second embodiment. In Fig. 8, field curvature S is the field curvature in the axial direction, and T is the field curvature in the meridional direction.

[0082] As shown in Table 19, the second embodiment satisfies each of the conditional expressions.

[0083] In this embodiment, the entrance pupil diameter EMPD of the optical imaging lens 20 is 0.649 mm, the full-field image height IH of the optical imaging lens 20 is 2.299 mm, the diagonal field of view angle FOV of the optical imaging lens 20 is 196.00°, and the aperture value Fno of the optical imaging lens 20 is 2.00, so that the optical imaging lens 20 meets the design requirements of large aperture and ultra-wide angle, the on-axis and off-axis chromatic aberrations are properly corrected, and it has excellent optical properties.

[0084] (Third embodiment) The third embodiment is basically the same as the first embodiment, and the symbols have the same meanings as those in the first embodiment. Please refer to Fig. 9 for the structural form of the optical imaging lens 30 of the third embodiment. Only the differences are listed below.

[0085] Tables 7 and 8 are tables showing design data of the optical imaging lens 30 according to the third embodiment of the present invention.

[0086] JPEG2024177035000008.jpg113145

[0087] Table 8 shows the aspheric data of each lens in the optical imaging lens 30 according to the third embodiment of the present invention.

[0088] JPEG2024177035000009.jpg188165

[0089] Table 9 shows the design data of the inflection point of each lens in the optical imaging lens 30 according to the third embodiment of the present invention.

[0090] JPEG2024177035000010.jpg83145

[0091] Fig. 10 and Fig. 11 are schematic diagrams showing axial aberration and lateral chromatic aberration after light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm passes through the optical imaging lens 30 of the third embodiment. Fig. 12 is a schematic diagram showing field curvature and distortion after light with wavelength of 550 nm passes through the optical imaging lens 30 of the third embodiment. In Fig. 12, field curvature S is the field curvature in the axial direction, and T is the field curvature in the meridional direction.

[0092] Below, in Table 19, the numerical values ​​corresponding to each conditional expression in this embodiment are shown according to the above conditional expressions. It is clear that the optical imaging lens 30 according to this embodiment satisfies the above conditional expressions.

[0093] In this embodiment, the entrance pupil diameter EMPD of the optical imaging lens 30 is 0.688 mm, the full-field image height IH of the optical imaging lens 30 is 2.188 mm, the diagonal field of view angle FOV of the optical imaging lens 30 is 196.00°, and the aperture value Fno of the optical imaging lens 30 is 2.00, so that the optical imaging lens 30 meets the design requirements of large aperture and ultra-wide angle, the on-axis and off-axis chromatic aberrations are properly corrected, and it has excellent optical properties.

[0094] (Fourth embodiment) The fourth embodiment is basically the same as the first embodiment, and the symbols have the same meanings as those in the first embodiment. Please refer to Fig. 13 for the structural form of the optical imaging lens 40 of the fourth embodiment. Only the differences are listed below.

[0095] Tables 10 and 11 are tables showing design data of the optical imaging lens 40 according to the fourth embodiment of the present invention.

[0096] JPEG2024177035000011.jpg112148

[0097] Table 11 shows the aspheric data of each lens in the optical imaging lens 40 according to the fourth embodiment of the present invention.

[0098] JPEG2024177035000012.jpg193165

[0099] Table 12 shows the design data of the inflection point of each lens in the optical imaging lens 40 according to the fourth embodiment of the present invention.

[0100] JPEG2024177035000013.jpg83136

[0101] Fig. 14 and Fig. 15 are schematic diagrams showing axial aberration and lateral chromatic aberration after light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm passes through the optical imaging lens 40 of the fourth embodiment. Fig. 16 is a schematic diagram showing field curvature and distortion after light with wavelength of 550 nm passes through the optical imaging lens 40 of the fourth embodiment. In Fig. 16, field curvature S is the field curvature in the axial direction, and T is the field curvature in the meridional direction.

[0102] Below, in Table 19, the numerical values ​​corresponding to each conditional expression in this embodiment are shown according to the above conditional expressions. It is clear that the optical imaging lens 40 according to this embodiment satisfies the above conditional expressions.

[0103] In this embodiment, the entrance pupil diameter EMPD of the optical imaging lens 40 is 0.616 mm, the full-field image height IH of the optical imaging lens 40 is 2.428 mm, the diagonal field of view angle FOV of the optical imaging lens 40 is 196.00°, and the aperture value Fno of the optical imaging lens 40 is 2.00, so that the optical imaging lens 40 meets the design requirements of large aperture and ultra-wide angle, and has good optical properties with its on-axis and off-axis chromatic aberrations corrected appropriately.

[0104] Fifth embodiment

[0105] The fifth embodiment is basically the same as the first embodiment, and the symbols have the same meanings as those in the first embodiment. Please refer to Fig. 17 for the structural form of the optical imaging lens 50 of the fifth embodiment. Only the differences are listed below.

[0106] Tables 13 and 14 are tables showing design data of the optical imaging lens 50 according to the fifth embodiment of the present invention.

[0107] JPEG2024177035000014.jpg113148

[0108] Table 14 shows the aspheric data of each lens in the optical imaging lens 50 according to the fifth embodiment of the present invention.

[0109] JPEG2024177035000015.jpg188165

[0110] Table 15 shows the design data of the inflection point of each lens in the optical imaging lens 50 according to the fifth embodiment of the present invention.

[0111] JPEG2024177035000016.jpg83136

[0112] Fig. 18 and Fig. 19 are schematic diagrams showing axial aberration and lateral chromatic aberration after light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm passes through the optical imaging lens 50 of the fifth embodiment. Fig. 20 is a schematic diagram showing field curvature and distortion after light with wavelength of 550 nm passes through the optical imaging lens 50 of the fifth embodiment. In Fig. 20, field curvature S is the field curvature in the axial direction, and T is the field curvature in the meridional direction.

[0113] Below, in Table 19, the numerical values ​​corresponding to each conditional expression in this embodiment are shown according to the above conditional expressions. It is clear that the optical imaging lens 50 according to this embodiment satisfies the above conditional expressions.

[0114] In this embodiment, the entrance pupil diameter EMPD of the optical imaging lens 50 is 0.867 mm, the full-field image height IH of the optical imaging lens 50 is 2.771 mm, the diagonal field of view angle FOV of the optical imaging lens 50 is 196.00°, and the aperture value Fno of the optical imaging lens 50 is 2.00, so that the optical imaging lens 50 meets the design requirements of large aperture and ultra-wide angle, the on-axis and off-axis chromatic aberrations are properly corrected, and it has excellent optical properties.

[0115] (Comparative embodiment) FIG. 21 is a diagram showing an optical imaging lens 60 according to a comparative embodiment.

[0116] Tables 16 and 17 are tables showing design data of the optical imaging lens 60 according to a comparative embodiment of the present invention.

[0117] JPEG2024177035000017.jpg112150

[0118] JPEG2024177035000018.jpg197165

[0119] Table 18 shows the design data of the inflection point of each lens in the optical imaging lens 60 according to the comparative embodiment of the present invention.

[0120] JPEG2024177035000019.jpg82136

[0121] 22 and 23 are schematic diagrams showing axial aberration and lateral chromatic aberration after light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm passes through the optical imaging lens 60 of the comparative embodiment. Fig. 24 is a schematic diagram showing field curvature and distortion after light with wavelength of 550 nm passes through the optical imaging lens 60 of the comparative embodiment. In Fig. 24, field curvature S is the field curvature in the axial direction, and T is the field curvature in the meridional direction.

[0122] Below, in Table 19, the numerical values ​​corresponding to each conditional expression in this comparative embodiment are shown according to the above conditional expressions. It is clear that the optical imaging lens 60 according to the comparative embodiment does not satisfy the above conditional expression 1.70≦n1≦2.20.

[0123] In this embodiment, the entrance pupil diameter EMPD of the optical imaging lens 60 is 0.724 mm, the full-field image height IH of the optical imaging lens 60 is 2.863 mm, the diagonal field of view angle FOV of the optical imaging lens 60 is 196.00°, and the aperture value Fno of the optical imaging lens 60 is 2.00. The optical imaging lens 60 does not have excellent optical properties because each aberration is not sufficiently corrected.

[0124] JPEG2024177035000020.jpg130154

[0125] The above-described embodiments are specific embodiments for realizing the present invention, and it will be understood by those skilled in the art that various changes in form and details can be made in practical application without departing from the spirit and scope of the present invention.

Claims

1. 1. An optical imaging lens, comprising: The optical system includes, in order from the object side to the image side, a first lens having negative refractive power, a second lens having negative refractive power, a third lens having positive refractive power, a fourth lens having positive refractive power, a fifth lens having negative refractive power, and a sixth lens having positive refractive power, the optical imaging lens having a refractive index of n1, a focal length of the optical imaging lens being f, a focal length of the second lens being f2, a focal length of the third lens being f3, a focal length of the fourth lens being f4, a central radius of curvature of the object-side surface of the sixth lens being R11, a central radius of curvature of the image-side surface of the sixth lens being R12, an axial thickness of the third lens being d5, and an axial distance from the image-side surface of the third lens to the object-side surface of the fourth lens being d6, which satisfy the following relational expressions: 1.70≦n1≦2.20 −2.30≦f2 / f≦−1.60 −1.80≦R11 / R12≦−0.50 0.10≦f3 / f4≦0.50 8.00≦d5 / d6≦30.00

2. 2. The optical imaging lens of claim 1, wherein a composite focal length of the fourth lens and the fifth lens is f45, an axial thickness of the fourth lens is d7, an axial distance from an image side surface of the fourth lens to an object side surface of the fifth lens is d8, and an axial thickness of the fifth lens is d9, satisfying the following relational expressions: -20.00≦f45 / (d7+d8+d9)≦-4.00

3. 2. The optical imaging lens as claimed in claim 1, wherein the refractive index of the third lens is n3, and satisfies the following relationship: 1.70≦n3≦2.20

4. an object side surface of the first lens is a convex surface at a paraxial position, and an image side surface of the first lens is a concave surface at a paraxial position; 2. The optical imaging lens of claim 1, wherein a total optical length of the optical imaging lens is TTL, a focal length of the first lens is f1, a central radius of curvature of an object-side surface of the first lens is R1, a central radius of curvature of an image-side surface of the first lens is R2, and an on-axial thickness of the first lens is d1, and the following relational expressions are satisfied: −11.38≦f1 / f≦−2.62 0.83≦(R1+R2) / (R1-R2)≦2.81 0.03≦d1 / TTL≦0.29

5. an object side surface of the second lens is concave at a paraxial position, and an image side surface of the second lens is concave at a paraxial position; 2. The optical imaging lens of claim 1, wherein a total optical length of the optical imaging lens is TTL, a central radius of curvature of an object-side surface of the second lens is R3, a central radius of curvature of an image-side surface of the second lens is R4, and an on-axial thickness of the second lens is d3, and the following relational expression is satisfied: 0.04≦(R3+R4) / (R3-R4)≦0.92 0.02≦d3 / TTL≦0.08

6. an object side surface of the third lens is a convex surface at a paraxial position, and an image side surface of the third lens is a convex surface at a paraxial position; 2. The optical imaging lens of claim 1, wherein a total optical length of the optical imaging lens is TTL, a central radius of curvature of an object-side surface of the third lens is R5, and a central radius of curvature of an image-side surface of the third lens is R6, satisfying the following relation: 1.11≦f3 / f≦6.09 -0.69≦(R5+R6) / (R5-R6)≦-0.17 0.09≦d5 / TTL≦0.37

7. an object side surface of the fourth lens is a convex surface at a paraxial position, and an image side surface of the fourth lens is a convex surface at a paraxial position; 2. The optical imaging lens of claim 1, wherein a total optical length of the optical imaging lens is TTL, a central radius of curvature of an object-side surface of the fourth lens is R7, a central radius of curvature of an image-side surface of the fourth lens is R8, and an on-axial thickness of the fourth lens is d7, satisfying the following relation: 2.71≦f4 / f≦32.42 -0.40≦(R7+R8) / (R7-R8)≦0.58 0.02≦d7 / TTL≦0.13

8. an object side surface of the fifth lens is concave at a paraxial position, and an image side surface of the fifth lens is concave at a paraxial position; 2. The optical imaging lens of claim 1, wherein a total optical length of the optical imaging lens is TTL, a focal length of the fifth lens is f5, a central radius of curvature of an object-side surface of the fifth lens is R9, a central radius of curvature of an image-side surface of the fifth lens is R10, and an on-axial thickness of the fifth lens is d9, and the following relational expressions are satisfied: −9.35≦f5 / f≦−1.54 -0.74≦(R9+R10) / (R9-R10)≦0.31 0.01≦d9 / TTL≦0.06

9. an object side surface of the sixth lens is a convex surface at a paraxial position, and an image side surface of the sixth lens is a convex surface at a paraxial position; 2. The optical imaging lens of claim 1, wherein a total optical length of the optical imaging lens is TTL, a focal length of the sixth lens is f6, and an on-axis thickness of the sixth lens is d11, satisfying the following relation: 0.99≦f6 / f≦3.98 0.04≦d11 / TTL≦0.21

10. 2. The optical imaging lens as claimed in claim 1, wherein an aperture value of the optical imaging lens is Fno, and a viewing angle of the optical imaging lens is FOV, satisfying the following relation: Fno≦2.00 FOV≧196.00°

11. The optical imaging lens as claimed in claim 1 , wherein the first lens is made of a glass material.

12. The optical imaging lens as claimed in claim 1 , wherein the third lens is made of a glass material.

Images