Imaging optical lens

Abstract

To provide an imaging optical lens capable of satisfying the requirements of an ultra-wide angle while obtaining a large aperture with good imaging performance.SOLUTION: The present application relates to the field of optical lenses and discloses an imaging optical lens, including, in order from an objective side surface to an image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The following relationship expressions are satisfied: 0.95≤f4 / f≤1.40;0.30≤d11 / d12≤1.00;3.00≤R1 / R2≤1.20≤(R9+R10) / (R9-R10)≤3.20. The imaging optical lens has excellent optical performance while satisfying the design requirements of a large aperture and an ultra-wide angle.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to the field of optical lenses, and more particularly to an imaging optical lens that can be applied to imaging devices such as mobile terminal devices such as smartphones, digital cameras, and sports cameras, as well as monitors and PC lenses. [Background technology]

[0002] In recent years, with the rise of smart devices, the demand for miniaturized imaging lenses has increased. The photosensitive element of a general imaging lens is limited to a charge coupled device (CCD) or a complementary metal-oxide semiconductor sensor (CMOS sensor). In addition to the miniaturization of the pixel size of the photosensitive element, the functionality and appearance of the current smart devices are in line with the trend of development, and miniaturized imaging lenses with good imaging quality have become the mainstream in the current market. Traditionally, the lenses installed in mobile phone cameras were mainly three or four-lens structures to obtain better imaging quality. In addition, with the development of technology and the diversification of user needs, the pixel area of ​​the photosensitive element has been shrinking, and the requirements for the imaging quality of the system have also continued to improve, so five-, six-, and seven-lens structures have gradually appeared in lens design. There is a strong need for a wide-angle imaging lens with excellent optical characteristics, ultra-thinness, and sufficient correction of chromatic aberration. Summary of the Invention

[0003] In view of the above problems, an object of the present invention is to provide an imaging optical lens that can satisfy the demand for a super wide angle while providing a large aperture with good imaging performance.

[0004] In order to solve the above technical problems, one embodiment of the present invention provides an imaging optical 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, a sixth lens having positive refractive power, and a seventh lens having negative refractive power, The imaging optical lens has a focal length f, the fourth lens has a focal length f4, the sixth lens has an axial thickness d11, the axial distance from the image side of the sixth lens to the object side surface of the seventh lens is d12, the first lens has a radius of curvature R1, the first lens has a radius of curvature R2, the fifth lens has a radius of curvature R9, and the fifth lens has a radius of curvature R10, which satisfy the following relational expressions: 0.95≦f4 / f≦1.40 0.30≦d11 / d12≦1.00 3.00≦R1 / R2≦12.00 1.20≦(R9+R10) / (R9-R10)≦3.20

[0005] Preferably, the axial thickness of the fourth lens is d7, the axial distance from the image side of the fourth lens to the object side surface of the fifth lens is d8, and the following relational expression is satisfied. 8.00≦d7 / d8≦25.20

[0006] Preferably, the sixth lens has a focal length of f6 and satisfies the following relation: 3.00≦f6 / f≦8.00

[0007] Preferably, the object side surface of the first lens is a convex surface at a paraxial position, the image side surface of the first lens is a concave surface at the paraxial position, the focal length of the first lens is f1, the axial thickness of the first lens is d1, and the total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: -7.70≦f1 / f≦-1.95 0.03≦d1 / TTL≦0.75

[0008] Preferably, the object side surface of the second lens is concave at a paraxial position, the image side surface of the second lens is concave at the paraxial position, the focal length of the second lens is f2, the radius of curvature of the object side surface of the second lens is R3, the 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 length of the imaging optical lens is TTL, and the following relational expression is satisfied. -5.83≦f2 / f≦-1.23 0.31≦(R3+R4) / (R3-R4)≦0.99 0.05≦d3 / TTL≦0.31

[0009] Preferably, the object side surface of the third lens is a convex surface at a paraxial position, the focal length of the third lens is f3, the radius of curvature of the object side surface of the third lens is R5, the radius of curvature of the image side surface of the third lens is R6, the axial thickness of the third lens is d5, and the total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: 0.72≦f3 / f≦2.89 -2.29≦(R5+R6) / (R5-R6)≦-0.61 0.05≦d5 / TTL≦0.22

[0010] Preferably, the object side surface of the fourth lens is a convex surface at a paraxial position, the image side surface of the fourth lens is a convex surface at a paraxial position, a radius of curvature of the object side surface of the fourth lens is R7, a radius of curvature of the image side surface of the fourth lens is R8, an axial thickness of the fourth lens is d7, and a total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: 0.08≦(R7+R8) / (R7-R8)≦0.34 0.02≦d7 / TTL≦0.11

[0011] Preferably, the object side surface of the fifth lens is a convex surface at a paraxial position, the image side surface of the fifth lens is a concave surface at a paraxial position, the focal length of the fifth lens is f5, the axial thickness of the fifth lens is d9, and the total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: -7.29≦f5 / f≦-1.06 0.01≦d9 / TTL≦0.04

[0012] Preferably, the image side of the sixth lens is a convex surface at a paraxial position, the radius of curvature of the object side surface of the sixth lens is R11, the radius of curvature of the image side surface of the sixth lens is R12, and the total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: -0.34≦(R11+R12) / (R11-R12)≦4.55 0.01≦d11 / TTL≦0.08

[0013] Preferably, the object side surface of the seventh lens is a convex surface at a paraxial position, the image side surface of the seventh lens is a concave surface at the paraxial position, the focal length of the seventh lens is f7, the radius of curvature of the object side surface of the seventh lens is R13, the radius of curvature of the image side surface of the seventh lens is R14, the axial thickness of the seventh lens is d13, and the total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied. -7.64≦f7 / f≦-1.18 0.91≦(R13+R14) / (R13-R14)≦5.68 0.01≦d13 / TTL≦0.06

[0014] Preferably, the imaging optical lens has a viewing angle, FOV, which satisfies the following relationship: FOV≧130.00°

[0015] Preferably, the aperture value of the imaging optical lens is FNO and satisfies the following relation: FNO≦2.6

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

[0017] Preferably, the fourth lens is made of a glass material. The beneficial effect of the present invention is that the imaging optical lens according to the present invention has good optical performance and can satisfy the design requirements for a large aperture and an ultra-wide angle, and is particularly suitable for mobile phone imaging lens components and web camera lenses that are composed of imaging elements such as CCD and CMOS for high pixel counts. [Brief description of the drawings]

[0018] [Figure 1] 1 is a schematic diagram illustrating the configuration of an imaging optical lens according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a schematic diagram of axial aberration of the imaging optical lens shown in FIG. [Diagram 3] 2 is a schematic diagram of magnification aberration of the imaging optical lens shown in FIG. 1. [Figure 4] 2 is a schematic diagram of the field curvature and distortion of the imaging optical lens shown in FIG. 1. [Diagram 5] FIG. 4 is a schematic diagram illustrating the configuration of an imaging optical lens according to a second embodiment of the present invention. [Figure 6] FIG. 6 is a schematic diagram of axial aberration of the imaging optical lens shown in FIG. 5. [Figure 7] 6 is a schematic diagram of magnification aberration of the imaging optical lens shown in FIG. 5. [Figure 8] 6 is a schematic diagram of the field curvature and distortion of the imaging optical lens shown in FIG. 5. [Figure 9] FIG. 11 is a schematic diagram illustrating the configuration of an imaging optical lens according to a third embodiment of the present invention. [Figure 10] FIG. 10 is a schematic diagram of axial aberration of the imaging optical lens shown in FIG. [Figure 11] 10 is a schematic diagram of magnification aberration of the imaging optical lens shown in FIG. 9. [Figure 12] 10 is a schematic diagram of the field curvature and distortion of the imaging optical lens shown in FIG. 9. [Figure 13] FIG. 11 is a schematic diagram illustrating the configuration of an imaging optical lens according to a fourth embodiment of the present invention. [Figure 14] FIG. 14 is a schematic diagram of axial aberration of the imaging optical lens shown in FIG. [Figure 15]FIG. 14 is a schematic diagram of magnification aberration of the imaging optical lens shown in FIG. [Figure 16] 14 is a schematic diagram of the field curvature and distortion of the imaging optical lens shown in FIG. 13. [Figure 17] FIG. 13 is a schematic diagram illustrating the configuration of an imaging optical lens according to a fifth embodiment of the present invention. [Figure 18] FIG. 18 is a schematic diagram of axial aberration of the imaging optical lens shown in FIG. [Figure 19] 18 is a schematic diagram of magnification aberration of the imaging optical lens shown in FIG. 17. [Figure 20] 18 is a schematic diagram of the field curvature and distortion of the imaging optical lens shown in FIG. 17. [Figure 21] FIG. 13 is a schematic diagram illustrating the configuration of an imaging optical lens according to a comparative embodiment of the present invention. [Figure 22] FIG. 22 is a schematic diagram of axial aberration of the imaging optical lens shown in FIG. 21. [Figure 23] FIG. 22 is a schematic diagram of magnification aberration of the imaging optical lens shown in FIG. 21. [Figure 24] 22 is a schematic diagram of the field curvature and distortion of the imaging optical lens shown in FIG. 21. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] 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.

[0020] (First embodiment) With reference to the accompanying drawings, the present invention provides an imaging optical lens 10. Fig. 1 shows an imaging optical lens 10 according to a first embodiment of the present invention, and the imaging optical lens 10 includes seven lenses. Specifically, the imaging optical 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, a seventh lens L7, and an image plane Si. In addition, an optical element such as an optical filter GF may be provided between the seventh lens L7 and the image plane Si.

[0021] In this embodiment, the first lens L1 and the fourth lens L4 are all made of a glass material, and the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are all made of a plastic material.

[0022] The focal length of the entire imaging optical lens is defined as f, and the focal length of the fourth lens L4 is defined as f4, and the following relationship is satisfied: 0.95≦f4 / f≦1.40. By defining the ratio of the focal length of the fourth lens L4 to the focal length of the entire system, the amount of field curvature of the system can be effectively balanced, and the field curvature offset of the central field can be less than 0.02 mm.

[0023] If the axial thickness of the sixth lens L6 is defined as d11 and the axial distance from the image side of the sixth lens L6 to the object side surface of the seventh lens L7 is defined as d12, the following relational expression is satisfied: 0.30≦d11 / d12≦1.00. By specifying the ratio between the center thickness of the sixth lens L6 and the air space from the sixth lens L6 to the seventh lens L7 (i.e., the axial thickness of the sixth lens L6 and the axial distance from the image side of the sixth lens L6 to the object side surface of the seventh lens L7), it is possible to reduce the difficulty of assembling the lenses in the actual production process within the range of the conditional expression.

[0024] If the radius of curvature of the object side surface of the first lens L1 is defined as R1 and the radius of curvature of the image side of the first lens L1 is defined as R2, the following relational expression is satisfied: 3.00≦R1 / R2≦12.00. By defining the shape of the first lens L1, it is possible to buffer the change in the angle of incidence of light rays from a large viewing angle, and to smoothly propagate the light rays through the optical imaging lens group, which is also advantageous for lens processing and lens assembly.

[0025] If the radius of curvature of the object side surface of the fifth lens L5 is defined as R9 and the radius of curvature of the image side surface of the fifth lens L5 is defined as R10, the following relational expression is satisfied: 1.20≦(R9+R10) / (R9-R10)≦3.20. By defining the shape of the fifth lens L5, the degree of deflection of light passing through the lens can be mitigated within the range of the conditional expression, and chromatic aberration can be efficiently corrected so that chromatic aberration |LC≦5.2 μm.

[0026] In this embodiment, the axial thickness of the fourth lens L4 is d7, and the axial distance from the image side of the fourth lens L4 to the object side of the fifth lens L5 is d8, which satisfies the following relational expression: 8.00≦d7 / d8≦25.20. By specifying the ratio between the center thickness of the fourth lens L4 and the air space from the fourth lens L4 to the fifth lens L5, the total length of the optical system can be compressed within the range of the conditional expression.

[0027] In this embodiment, the focal length of the imaging optical lens is f, and the focal length of the sixth lens L6 is f6, which satisfies the following relation: 3.00≦f6 / f≦8.00. By defining the ratio between the focal length of the sixth lens L6 and the focal length of the entire system, the optical focal length of the optical system is reasonably allocated, thereby achieving both better imaging quality and low sensitivity.

[0028] In this embodiment, the focal length of the imaging optical lens is defined as f, and the focal length of the first lens L1 is defined as f1, and the following relational expression is satisfied: -7.70≦f1 / f≦-1.95. The negative refractive power of the first lens L1 is specified, and if it exceeds the upper limit specified value, 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 at the same time, it does not contribute to the development of wide-angle lenses. Conversely, if it exceeds the lower limit specified value, the negative refractive power of the first lens L1 becomes too weak, making it difficult to develop ultra-thin lenses. Preferably, -4.82≦f1 / f≦-2.44.

[0029] In this embodiment, the object side surface of the first lens L1 is a convex surface at the paraxial position, and the image side surface is a concave surface at the paraxial position, and the first lens L1 has negative refractive power.

[0030] The axial thickness of the first lens L1 is defined as d1, and the total optical length of the imaging optical lens is defined as TTL, and the following relational expression is satisfied: 0.03≦d1 / TTL≦0.75. This contributes to realizing an ultra-thin structure. Also, preferably, 0.04≦d1 / TTL≦0.60.

[0031] In this embodiment, the focal length of the imaging optical lens is defined as f, and the focal length of the second lens L2 is defined as f2, and the following relational expression is satisfied: -5.83≦f2 / f≦-1.23. This makes it possible to obtain a well-balanced field curvature to efficiently improve image quality. Also, it is preferable that -3.64≦f2 / f≦-1.54.

[0032] The radius of curvature of the object side surface of the second lens L2 is defined as R3, and the radius of curvature of the image side surface of the second lens L2 is defined as R4, and the following relational expression is satisfied: 0.31≦(R3+R4) / (R3-R4)≦0.99. By defining the shape of the second lens L2, it is advantageous to correct the problem of axial chromatic aberration as the lens is developed into an ultra-thin wide-angle lens within the range. Also, preferably, 0.50≦(R3+R4) / (R3-R4)≦0.79.

[0033] In this embodiment, the object side surface of the second lens L2 is concave at the paraxial position, the image side surface is concave at the paraxial position, and the second lens L2 has negative refractive power.

[0034] The axial thickness of the second lens L2 is defined as d3, and the total optical length of the imaging optical lens is defined as TTL, and the following relational expression is satisfied: 0.05≦d3 / TTL≦0.31. This is advantageous for realizing an ultra-thin structure. In addition, it is preferable that 0.09≦d3 / TTL≦0.25.

[0035] In this embodiment, the focal length of the imaging optical lens is defined as f, and the focal length of the third lens L3 is defined as f3, and the following relational expression is satisfied: 0.72≦f3 / f≦2.89. By rationally allocating the optical focal lengths, better imaging quality and low sensitivity are both achieved. Also, preferably, 1.15≦f3 / f≦2.31.

[0036] The radius of curvature of the object side surface of the third lens L3 is defined as R5, and the radius of curvature of the image side of the third lens L3 is defined as R6, and the following relational expression is satisfied: -2.29≦(R5+R6) / (R5-R6)≦-0.61. By defining the shape of the third lens L3, it is advantageous to correct problems such as off-axis aberrations in the development of ultra-thin wide-angle lenses. In addition, it is preferable that -1.43≦(R5+R6) / (R5-R6)≦-0.77.

[0037] In this embodiment, the object side surface of the third lens L3 is convex at the paraxial position, and the image side surface is convex at the paraxial position, and the third lens L3 has a positive refractive power. Also, in any other embodiment, the image side of the third lens L3 may be set as other concave-convex distribution cases.

[0038] The axial thickness of the third lens L3 is defined as d5, and the total optical length of the imaging optical lens is defined as TTL, and the following relational expression is satisfied: 0.05≦d5 / TTL≦0.22. This facilitates the realization of an ultra-thin structure. Also, preferably, 0.08≦d5 / TTL≦0.18.

[0039] In this embodiment, the radius of curvature of the object side surface of the fourth lens L4 is defined as R7, and the radius of curvature of the image side surface of the fourth lens L4 is defined as R8, and the following relational expression is satisfied: 0.08≦(R7+R8) / (R7-R8)≦0.34. By defining the shape of the fourth lens L4, it is advantageous to correct problems such as aberrations of off-axis angles of view as ultra-thin and wide-angle lenses progress within the conditional range. Also, preferably, 0.13≦(R7+R8) / (R7-R8)≦0.27.

[0040] 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.

[0041] The axial thickness of the fourth lens L4 is defined as d7, and the total optical length of the imaging optical lens is defined as TTL, and the following relational expression is satisfied: 0.02≦d7 / TTL≦0.11. This is advantageous for realizing an ultra-thin structure. Also, preferably, 0.03≦d7 / TTL≦0.09.

[0042] In this embodiment, the focal length of the imaging optical lens is defined as f, and the focal length of the fifth lens L5 is defined as f5, and the following relational expression is satisfied: -7.29≦f5 / f≦-1.06. The negative refractive power of the fifth lens L5 is specified, and if it exceeds the upper limit specified value, it is advantageous for development toward ultra-thinness, but the negative refractive power of the fifth lens L5 becomes too strong, making it difficult to correct problems such as aberrations, and is disadvantageous for development toward the wide-angle side. Conversely, if it exceeds the lower limit specified value, the negative refractive power of the fifth lens L5 becomes too weak, making it difficult to develop toward the ultra-thin side. Preferably, -4.55≦f5 / f≦-1.32.

[0043] In this embodiment, the object side surface of the fifth lens L5 is a convex surface at the paraxial position, and the image side surface is a concave surface at the paraxial position, and the fifth lens L5 has negative refractive power.

[0044] The axial thickness of the fifth lens L5 is defined as d9, and the total optical length of the imaging optical lens is defined as TTL, and the following relational expression is satisfied: 0.01≦d9 / TTL≦0.04. This is advantageous for realizing an ultra-thin structure. In addition, it is preferable that 0.01≦d9 / TTL≦0.03.

[0045] In this embodiment, the radius of curvature of the object side surface of the sixth lens L6 is defined as R11, and the radius of curvature of the image side surface of the sixth lens L6 is defined as R12, and the following relational expression is satisfied: -0.34≦(R11+R12) / (R11-R12)≦4.55. By defining the shape of the sixth lens L6, it is advantageous to correct problems such as off-axis angle of view aberrations as ultra-thin and wide-angle lenses advance within the range. Also, preferably, -0.21≦(R11+R12) / (R11-R12)≦3.64.

[0046] In this embodiment, the object side surface of the sixth lens L6 is convex at the paraxial position, and the image side surface is convex at the paraxial position, and the sixth lens L6 has positive refractive power. In any other embodiment, the object side surface of the sixth lens L6 may be set as other concave-convex distribution cases.

[0047] The axial thickness of the sixth lens L6 is defined as d11, and the total optical length of the imaging optical lens is defined as TTL, and the following relational expression is satisfied: 0.01≦d11 / TTL≦0.08. This is advantageous for realizing an ultra-thin structure. In addition, it is preferable that 0.01≦d11 / TTL≦0.06.

[0048] In this embodiment, the focal length of the imaging optical lens is defined as f, and the focal length of the seventh lens L7 is defined as f7, and the following relational expression is satisfied: -7.64≦f7 / f≦-1.18. The negative refractive power of the seventh lens L7 is specified, and if it exceeds the upper limit specified value, it is advantageous for development toward ultra-thinness, but the negative refractive power of the seventh lens L7 becomes too strong, making it difficult to correct problems such as aberrations and not contributing to development toward the wide-angle side, and conversely, if it exceeds the lower limit specified value, the negative refractive power of the seventh lens L7 becomes too weak, making it difficult to develop toward the ultra-thin side. Preferably, 4.77≦f7 / f≦-1.48.

[0049] The radius of curvature of the object side surface of the seventh lens L7 is defined as R13, and the radius of curvature of the image side surface of the seventh lens L7 is defined as R14, and the following relational expression is satisfied: 0.91≦(R13+R14) / (R13-R14)≦5.68. By defining the shape of the sixth lens L6, within the condition range, it is advantageous to correct problems such as aberrations of off-axis angle of view as ultra-thin and wide-angle lenses progress. Also, preferably, 1.46≦(R13+R14) / (R13-R14)≦4.54.

[0050] In this embodiment, the object side surface of the seventh lens L7 is a convex surface at the paraxial position, and the image side surface is a concave surface at the paraxial position, and the seventh lens L7 has negative refractive power.

[0051] The seventh lens L7 has an axial thickness of d13, and the total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: 0.01≦d13 / TTL≦0.06. This is advantageous for realizing an ultra-thin structure. Also, preferably, 0.02≦d13 / TTL≦0.05.

[0052] The imaging optical 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, radius of curvature, axial thickness, inflection point position, and stationary point position are all in mm.

[0053] TTL: Total optical length (the axial distance from the object side of the first lens L1 to the image side), in mm;

[0054] Preferably, the front and / or rear 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.

[0055] Tables 1 and 2 show design data for the imaging optical lens 10 according to the first embodiment of the present invention.

[0056] JPEG2024177036000002.jpg118154

[0057] Here, the meanings of the symbols are as follows: S1: aperture; R: radius of curvature of the optical surface, in the case of a lens, the central radius of curvature; R1: radius of curvature of the object side surface of the first lens L1; R2: radius of curvature on the image side of the first lens L1; R3: radius of curvature of the object side surface of the second lens L2; R4: Radius of curvature on the image side of the second lens L2; R5: radius of curvature of the object side surface of the third lens L3; R6: Radius of curvature on the image side of the third lens L3; R7: radius of curvature of the object side surface of the fourth lens L4; R8: Radius of curvature of the image side of the fourth lens L4; R9: radius of curvature of the object side surface of the fifth lens L5; R10: Radius of curvature of the image side of the fifth lens L5; R11: radius of curvature of the object side surface of the sixth lens L6; R12: Radius of curvature of the image side of the sixth lens L6; R13: radius of curvature of the object side surface of the seventh lens L7; R14: Radius of curvature on the image side of the seventh lens L7; R15: Radius of curvature of the object side surface of the optical filter GF; R16: Radius of curvature of the optical filter GF on the image side; 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 of the first lens L1 to the object side of the second lens L2; d3: axial thickness of the second lens L2; d4: the axial distance from the image side 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 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 of the fourth lens L4 to the object side of the fifth lens L5; d9: Axial thickness of the fifth lens L5; d10: the axial distance from the image side of the fifth lens L5 to the object side of the sixth lens L6; d11: Axial thickness of the sixth lens L6; d12: the axial distance from the image side of the sixth lens L6 to the object side of the seventh lens L7; d13: Axial thickness of the seventh lens L7; d14: the axial distance from the image side of the seventh lens L7 to the object side of the optical filter GF; d15: the axial thickness of the optical filter GF; d16: Axial distance from the image side of the optical filter GF to the image plane; 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; nd7: refractive index of the seventh lens L7 at the d line; ndg: refractive index of the d line of the optical filter GF; 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; v7: Abbe number of the seventh lens L7; vg: Abbe number of the optical filter GF.

[0058] Table 2 shows the aspheric data of each lens of the imaging optical lens 10 according to the first embodiment of the present invention.

[0059] JPEG2024177036000003.jpg206164

[0060] 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).

[0061] [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)

[0062] 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).

[0063] Tables 3 and 4 are tables showing design data of the inflection point and stationary point of each lens in the imaging optical lens 10 according to the first embodiment of the present invention. Here, P1R1 and P1R2 respectively represent the object side surface and image side surface of the first lens L1, P2R1 and P2R2 respectively represent the object side surface and image side surface of the second lens L2, P3R1 and P3R2 respectively represent the object side surface and image side surface of the third lens L3, P4R1 and P4R2 respectively represent the object side surface and image side surface of the fourth lens L4, P5R1 and P5R2 respectively represent the object side surface and image side surface of the fifth lens L5, P6R1 and P6R2 respectively represent the object side surface and image side surface of the sixth lens L6, and P7R1 and P7R2 respectively represent the object side surface and image side surface of the seventh lens L7. The data corresponding to the "inflection point position" column is the vertical distance from the inflection point set on each lens surface to the optical axis of the imaging optical lens 10. The data corresponding to the "stationary point position" column is the vertical distance from the stationary point set on each lens surface to the optical axis of the imaging optical lens 10.

[0064] JPEG2024177036000004.jpg99147

[0065] JPEG2024177036000005.jpg99104

[0066] Fig. 2 and Fig. 3 are schematic diagrams showing axial aberration and lateral chromatic aberration after light of wavelengths 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm passes through the imaging optical lens 10 of the first embodiment. Fig. 4 is a schematic diagram showing field curvature and distortion after light of wavelength 555.0 nm passes through the imaging optical 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 meridian direction.

[0067] Table 25, which will be shown later, shows various numerical values ​​and values ​​corresponding to parameters defined by conditional expressions in each of Examples 1, 2, 3, 4, 5, and the comparative example.

[0068] As shown in Table 25, the first embodiment satisfies each of the conditional expressions.

[0069] In this embodiment, the imaging optical lens 10 has an entrance pupil diameter EMPD of 1.538 mm, a total field-of-view image height IH of 6.060 mm, a diagonal field-of-view angle FOV of 155.65°, and an aperture value FNO of 2.60. The imaging optical lens 10 satisfies design requirements for a large aperture and ultra-wide angle, and has excellent optical characteristics with appropriately corrected on-axis and off-axis chromatic aberrations.

[0070] Second embodiment The second embodiment is basically the same as the first embodiment, and the reference symbols have the same meanings as in the first embodiment, so only the differences will be listed below.

[0071] Tables 5 and 6 show design data for the imaging optical lens 20 according to the second embodiment of the present invention.

[0072] JPEG2024177036000006.jpg156154

[0073] Table 6 shows the aspheric data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.

[0074] JPEG2024177036000007.jpg206156

[0075] Tables 7 and 8 show design data for the inflection points and stationary points of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.

[0076] JPEG2024177036000008.jpg145109

[0077] JPEG2024177036000009.jpg99110

[0078] Fig. 6 and Fig. 7 are schematic diagrams showing axial aberration and lateral chromatic aberration after light of wavelengths 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm has passed through the imaging optical lens 20 of the second embodiment. Fig. 8 is a schematic diagram showing field curvature and distortion after light of wavelength 555.0 nm has passed through the imaging optical 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 meridian direction.

[0079] As shown in Table 25, the second embodiment satisfies each of the conditional expressions.

[0080] In this embodiment, the imaging optical lens 20 has an entrance pupil diameter EMPD of 1.360 mm, a total field-of-view image height IH of 6.060 mm, a diagonal field-of-view angle FOV of 178.00°, and an aperture value FNO of 2.60. The imaging optical lens 20 satisfies design requirements for a large aperture and ultra-wide angle, and has excellent optical characteristics with appropriately corrected on-axis and off-axis chromatic aberrations.

[0081] Third embodiment The third embodiment is basically the same as the first embodiment, and the symbols have the same meanings as in the first embodiment, so only the differences will be listed below. However, the image side of the third lens L3 is concave at the paraxial position, and the object side surface of the sixth lens L6 is concave at the paraxial position.

[0082] Tables 9 and 10 show design data for the imaging optical lens 30 according to the third embodiment of the present invention.

[0083] JPEG2024177036000010.jpg118151

[0084] Table 10 shows the aspheric data of each lens of the imaging optical lens 30 according to the third embodiment of the present invention.

[0085] JPEG2024177036000011.jpg205154

[0086] Tables 11 and 12 are tables showing design data for the inflection points and stationary points of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.

[0087] JPEG2024177036000012.jpg99117

[0088] JPEG2024177036000013.jpg101119

[0089] Fig. 10 and Fig. 11 are schematic diagrams showing axial aberration and lateral chromatic aberration after light of wavelengths 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm has passed through the imaging optical lens 30 of the third embodiment. Fig. 12 is a schematic diagram showing field curvature and distortion after light of wavelength 555.0 nm has passed through the imaging optical 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 meridian direction.

[0090] As shown in Table 25, the third embodiment satisfies each of the conditional expressions.

[0091] In this embodiment, the imaging optical lens 30 has an entrance pupil diameter EMPD of 1.831 mm, a total field-of-view image height IH of 6.060 mm, a diagonal field-of-view angle FOV of the imaging optical lens 30 of 150.55°, and an aperture value FNO of 2.60. The imaging optical lens 30 satisfies design requirements for a large aperture and ultra-wide angle, and has excellent optical characteristics with appropriately corrected on-axis and off-axis chromatic aberrations.

[0092] (Fourth embodiment) The fourth embodiment is basically the same as the first embodiment, and the symbols have the same meanings as in the first embodiment, so only the differences will be listed below. However, the object side surface of the sixth lens L6 is concave at the paraxial position.

[0093] Tables 13 and 14 show design data for the imaging optical lens 40 according to the fourth embodiment of the present invention.

[0094] JPEG2024177036000014.jpg118151

[0095] Table 14 shows the aspheric data of each lens of the imaging optical lens 40 according to the fourth embodiment of the present invention.

[0096] JPEG2024177036000015.jpg206147

[0097] Tables 15 and 16 are tables showing design data for the inflection points and stationary points of each lens in the imaging optical lens 40 according to the fourth embodiment of the present invention.

[0098] JPEG2024177036000016.jpg99121

[0099] JPEG2024177036000017.jpg99120

[0100] Fig. 14 and Fig. 15 are schematic diagrams showing axial aberration and lateral chromatic aberration after light having wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm has passed through the imaging optical lens 40 of the fourth embodiment. Fig. 16 is a schematic diagram showing field curvature and distortion after light having a wavelength of 555.0 nm has passed through the imaging optical 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 meridian direction.

[0101] As shown in Table 25, the fourth embodiment satisfies each of the conditional expressions.

[0102] In this embodiment, the imaging optical lens 40 has an entrance pupil diameter EMPD of 1.539 mm, a total field-of-view image height IH of 6.060 mm, a diagonal field-of-view angle FOV of the imaging optical lens 40 of 133.00°, and an aperture value FNO of 2.60. The imaging optical lens 40 satisfies design requirements for a large aperture and ultra-wide angle, and has excellent optical characteristics with appropriately corrected on-axis and off-axis chromatic aberrations.

[0103] Fifth embodiment The fifth embodiment is basically the same as the first embodiment, and the reference symbols have the same meanings as in the first embodiment, so only the differences will be listed below.

[0104] Tables 17 and 18 show design data for the imaging optical lens 50 according to the fifth embodiment of the present invention.

[0105] JPEG2024177036000018.jpg118148

[0106] JPEG2024177036000019.jpg206147

[0107] Tables 19 and 20 show design data for the inflection points and stationary points of each lens of the imaging optical lens 50 according to the fifth embodiment of the present invention.

[0108] JPEG2024177036000020.jpg99131

[0109] JPEG2024177036000021.jpg9997

[0110] Fig. 18 and Fig. 19 are schematic diagrams showing axial aberration and lateral chromatic aberration after light of wavelengths 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm has passed through the imaging optical lens 50 of the fifth embodiment. Fig. 20 is a schematic diagram showing field curvature and distortion after light of wavelength 555.0 nm has passed through the imaging optical 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 meridian direction.

[0111] As shown in Table 25, the fifth embodiment satisfies each of the conditional expressions.

[0112] In this embodiment, the imaging optical lens 50 has an entrance pupil diameter EMPD of 1.273 mm, a total field-of-view image height IH of 6.060 mm, a diagonal field-of-view angle FOV of 144.47°, and an aperture value FNO of 2.60. The imaging optical lens 50 satisfies design requirements for a large aperture and ultra-wide angle, and has excellent optical characteristics with appropriately corrected on-axis and off-axis chromatic aberrations.

[0113] Comparative Example The comparative example is basically the same as the first embodiment, and the symbols have the same meanings as in the first embodiment, so only the differences will be listed below.

[0114] Tables 21 and 22 show the design data of the imaging optical lens 60 according to this comparative example.

[0115] JPEG2024177036000022.jpg118148

[0116] JPEG2024177036000023.jpg206147

[0117] Tables 23 and 24 are tables showing the design data of the inflection point and stationary point of each lens in the imaging optical lens 60 according to a comparative example of the present invention.

[0118] JPEG2024177036000024.jpg99121

[0119] JPEG2024177036000025.jpg99122

[0120] Fig. 22 and Fig. 23 are schematic diagrams showing axial aberration and lateral chromatic aberration after light having wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm passes through the imaging optical lens 60 of the comparative example. Fig. 24 is a schematic diagram showing field curvature and distortion after light having wavelength of 555.0 nm passes through the imaging optical lens 60 of the comparative example. In Fig. 24, field curvature S is the field curvature in the axial direction, and T is the field curvature in the meridian direction.

[0121] Table 25 below shows the numerical values ​​corresponding to each condition in the comparative example according to the above condition. It is clear that the imaging optical lens 60 of the comparative example does not satisfy the above condition 0.95≦f4 / f≦1.40.

[0122] In this embodiment, the imaging optical lens 60 has an entrance pupil diameter EMPD of 1.270 mm, a total field-of-view image height IH of 6.060 mm, a diagonal field-of-view angle FOV of 173.20°, and an aperture value FNO of 2.60. The imaging optical lens 60 does not have excellent optical characteristics because each aberration is not sufficiently corrected.

[0123] JPEG2024177036000026.jpg194159

[0124] 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 imaging optical lens, comprising: the imaging optical lens 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, a sixth lens having positive refractive power, and a seventh lens having negative refractive power; the imaging optical lens has a focal length f, the focal length of the fourth lens is f4, the axial thickness of the sixth lens is d11, the axial distance from the image side of the sixth lens to the object side surface of the seventh lens is d12, the radius of curvature of the object side surface of the first lens is R1, the radius of curvature of the image side surface of the first lens is R2, the radius of curvature of the object side surface of the fifth lens is R9, and the radius of curvature of the image side surface of the fifth lens is R10, and the following relational expressions are satisfied: 0.95≦f4 / f≦1.40 0.30≦d11 / d12≦1.00 3.00≦R1 / R2≦12.00 1.20≦(R9+R10) / (R9-R10)≦3.20

2. 2. The imaging optical lens according to claim 1, wherein an axial thickness of the fourth lens is d7, an axial distance from an image side of the fourth lens to an object side of the fifth lens is d8, and the following relational expression is satisfied: 8.00≦d7 / d8≦25.20

3. 2. The imaging optical lens according to claim 1, wherein the sixth lens has a focal length of f6 and satisfies the following relation: 3.00≦f6 / f≦8.00

4. 2. The imaging optical lens according to claim 1, wherein an object side surface of the first lens is a convex surface at a paraxial position, an image side surface of the first lens is a concave surface at a paraxial position, a focal length of the first lens is f1, an axial thickness of the first lens is d1, and a total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: −7.70≦f1 / f≦−1.95 0.03≦d1 / TTL≦0.75

5. 2. The imaging optical lens according to claim 1, wherein the object side surface of the second lens is concave at a paraxial position, the image side surface of the second lens is concave at the paraxial position, a focal length of the second lens is f2, a radius of curvature of the object side surface of the second lens is R3, a radius of curvature of the image side surface of the second lens is R4, an axial thickness of the second lens is d3, and a total length of the imaging optical lens is TTL, and the following relational expression is satisfied: −5.83≦f2 / f≦−1.23 0.31≦(R3+R4) / (R3-R4)≦0.99 0.05≦d3 / TTL≦0.31

6. 2. The imaging optical lens according to claim 1, wherein an object side surface of the third lens is a convex surface at a paraxial position, a focal length of the third lens is f3, a radius of curvature of the object side surface of the third lens is R5, a radius of curvature of the image side surface of the third lens is R6, an axial thickness of the third lens is d5, and a total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: 0.72≦f3 / f≦2.89 -2.29≦(R5+R6) / (R5-R6)≦-0.61 0.05≦d5 / TTL≦0.22

7. 2. The imaging optical lens according to claim 1, wherein the object side surface of the fourth lens is a convex surface at a paraxial position, the image side surface of the fourth lens is a convex surface at the paraxial position, a radius of curvature of the object side surface of the fourth lens is R7, a radius of curvature of the image side surface of the fourth lens is R8, an axial thickness of the fourth lens is d7, and a total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: 0.08≦(R7+R8) / (R7-R8)≦0.34 0.02≦d7 / TTL≦0.11

8. 2. The imaging optical lens according to claim 1, wherein an object side surface of the fifth lens is a convex surface at a paraxial position, an image side surface of the fifth lens is a concave surface at a paraxial position, a focal length of the fifth lens is f5, an axial thickness of the fifth lens is d9, and a total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: −7.29≦f5 / f≦−1.06 0.01≦d9 / TTL≦0.04

9. 2. The imaging optical lens according to claim 1, wherein an image side of the sixth lens is a convex surface at a paraxial position, a radius of curvature of an object side surface of the sixth lens is R11, a radius of curvature of the image side of the sixth lens is R12, a total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: -0.34≦(R11+R12) / (R11-R12)≦4.55 0.01≦d11 / TTL≦0.08

10. 2. The imaging optical lens according to claim 1, wherein the object side surface of the seventh lens is a convex surface at a paraxial position, the image side surface of the seventh lens is a concave surface at the paraxial position, the focal length of the seventh lens is f7, the radius of curvature of the object side surface of the seventh lens is R13, the radius of curvature of the image side surface of the seventh lens is R14, the axial thickness of the seventh lens is d13, and the total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: −7.64≦f7 / f≦−1.18 0.91≦(R13+R14) / (R13-R14)≦5.68 0.01≦d13 / TTL≦0.06

11. 2. The imaging optical lens according to claim 1, wherein the viewing angle of the imaging optical lens is FOV, and satisfies the following relation: FOV≧130.00°

12. 2. The imaging optical lens according to claim 1, wherein the aperture value of the imaging optical lens is FNO, and satisfies the following relational expression: FNO≦2.6

13. The imaging optical lens according to claim 1 , wherein the first lens is made of a glass material.

14. The imaging optical lens according to claim 1 , wherein the fourth lens is made of a glass material.

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