Imaging Optical Lens

Abstract

The present invention relates to the field of optical lenses, and provides an imaging optical lens. [Solution] The imaging optical lens is composed of, in order from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, and satisfies the following conditional expressions: 1.00≦R7 / R8≦3.00, 80.00≦FOV / Fno≦120.00, 10.00≦TTL / d3≦20.00, and −4.00≦f6 / f7≦−1.00, where R7 is the central radius of curvature of the object side surface of the fourth lens, R8 is the central radius of curvature of the image side surface of the fourth lens, FOV is the angle of view of the imaging optical lens, Fno is the aperture value of the imaging optical lens, TTL is the optical length of the imaging optical lens, d3 is the axial thickness of the second lens, f6 is the focal length of the sixth lens, and f7 is the focal length of the seventh lens. The imaging optical lens of the present invention has good optical performance such as a large aperture and a wide angle.

Description

[Technical field]

[0001] The present invention relates to the field of optical lenses, and more particularly to imaging optical lenses applied to mobile terminal devices such as smartphones and digital cameras, laser radar devices, and imaging devices such as monitors and PC lenses. [Background technology]

[0002] In recent years, the demand for miniaturization of imaging lenses has been increasing. For example, under the promotion of intelligent detection technology, 3D spatial detection technology based on laser radar has been actively developed. Laser radar lenses have the advantages of high detection accuracy, strong anti-interference ability, long coverage range, wide application range, etc., and are therefore applied in military and civilian fields. However, there are only two types of photosensitive elements in imaging lenses, namely, charge coupled devices (CCD) and complementary metal-oxide semiconductor sensors (CMOS sensors). With the progress of semiconductor manufacturing process technology, the pixel size of the photosensitive elements has been reduced, and miniaturized imaging lenses with good imaging quality have become the mainstream in the current market. In addition, with the development of technology and the increasing diversification needs of users, the pixel area of ​​the photosensitive elements is shrinking and the system's requirements for imaging quality are increasing, so that 5-element, 6-element, and 7-element lens configurations are gradually appearing in lens designs. Demand for large-diameter, wide-angle imaging optical lenses with excellent optical properties is becoming increasingly urgent. Summary of the Invention [Problem to be solved by the invention]

[0003] SUMMARY OF THE PRESENT EMBODIMENT In order to solve the above problems, an object of the present invention is to provide an imaging optical lens that can satisfy the demands for a large aperture and a wide angle. [Means for solving the problem]

[0004] To solve the above technical problems, an embodiment of the present invention provides an imaging optical lens. the imaging optical lens is composed of, in order from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens; When the central radius of curvature of the object side surface of the fourth lens is R7, the central radius of curvature of the image side surface of the fourth lens is R8, the angle of view of the imaging optical lens is FOV, the aperture value of the imaging optical lens is Fno, the optical length of the imaging optical lens is TTL, the axial thickness of the second lens is d3, the focal length of the sixth lens is f6, and the focal length of the seventh lens is f7, the following conditional formulas (1) to (4) are satisfied. 1.00≦R7 / R8≦3.00 (1) 80.00≦FOV / Fno≦120.00 (2) 10.00≦TTL / d3≦20.00 (3) -4.00≦f6 / f7≦-1.00 (4)

[0005] Preferably, when the axial thickness of the third lens is d5 and the axial thickness of the fourth lens is d7, the following conditional formula (5) is satisfied. 0.80≦d5 / d7≦4.00 (5)

[0006] Preferably, when the central radius of curvature of the object-side surface of the first lens is R1 and the central radius of curvature of the image-side surface of the first lens is R2, the following conditional formula (6) is satisfied. 1.20≦(R1+R2) / (R1−R2)≦3.00 (6)

[0007] Preferably, when the focal length of the fifth lens is f5 and the focal length of the imaging optical lens is f, the following conditional expression (7) is satisfied. 1.50≦f5 / f≦5.00 (7)

[0008] Preferably, the first lens has negative refractive power, an object side surface of the first lens is a convex surface in a paraxial direction, and an image side surface of the first lens is a concave surface in a paraxial direction, When the focal length of the first lens is f1, the focal length of the imaging optical lens is f, and the axial thickness of the first lens is d1, the following conditional expressions (8) and (9) are satisfied. -5.62≦f1 / f≦-1.07 (8) 0.01≦d1 / TTL≦0.15 (9)

[0009] Preferably, the second lens has negative refractive power, an object side surface of the second lens is a concave surface in a paraxial direction, and an image side surface of the second lens is a convex surface in a paraxial direction, When the focal length of the second lens is f2, the focal length of the imaging optical lens is f, the central radius of curvature of the object side surface of the second lens is R3, and the central radius of curvature of the image side surface of the second lens is R4, the following conditional expressions (10) and (11) are satisfied. -150.64≦f2 / f≦-2.60 (10) -26.46≦(R3+R4) / (R3-R4)≦-2.45 (11)

[0010] Preferably, the third lens has a positive refractive power, an object side surface of the third lens is a convex surface on a paraxial line, and an image side surface of the third lens is a convex surface on a paraxial line, When the focal length of the third lens is f3, the focal length of the imaging optical lens is f, the central radius of curvature of the object side surface of the third lens is R5, the central radius of curvature of the image side surface of the third lens is R6, and the axial thickness of the third lens is d5, the following conditional expressions (12) to (14) are satisfied. 0.80≦f3 / f≦3.50 (12) 0.33≦(R5+R6) / (R5−R6)≦1.14 (13) 0.04≦d5 / TTL≦0.28 (14)

[0011] Preferably, the object side surface of the fourth lens is a paraxially convex surface, and the image side surface of the fourth lens is a paraxially concave surface, When the focal length of the fourth lens is f4, the focal length of the imaging optical lens is f, and the axial thickness of the fourth lens is d7, the following conditional expressions (15) and (16) are satisfied. -19.73≦f4 / f≦212.93 (15) 0.02≦d7 / TTL≦0.25 (16)

[0012] Preferably, the fifth lens has positive refractive power, and an image side surface of the fifth lens is convex on a paraxial line, When 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 axial thickness of the fifth lens is d9, the following conditional expressions (17) and (18) are satisfied. 0.18≦(R9+R10) / (R9−R10)≦2.37 (17) 0.02≦d9 / TTL≦0.11 (18)

[0013] Preferably, the sixth lens has negative refractive power, and an image side surface of the sixth lens is concave in a paraxial direction; When the focal length of the photographing optical lens is f, 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, and the axial thickness of the sixth lens is d11, the following conditional expressions (19) to (21) are satisfied. -33.00≦f6 / f≦-3.68 (19) -0.53≦(R11+R12) / (R11−R12)≦8.71 (20) 0.05≦d11 / TTL≦0.22 (21)

[0014] Preferably, the seventh lens has positive refractive power, and an object side surface of the seventh lens is convex on a paraxial line, When the focal length of the photographing optical lens is f, the central radius of curvature of the object side surface of the seventh lens is R13, the central radius of curvature of the image side surface of the seventh lens is R14, and the axial thickness of the seventh lens is d13, the following conditional expressions (22) to (24) are satisfied. 1.66≦f7 / f≦8.62 (22) -16.02≦(R13+R14) / (R13-R14)≦-0.65 (23) 0.02≦d13 / TTL≦0.10 (24)

[0015] Preferably, the first lens and / or the second lens and / or the third lens and / or the fourth lens and / or the fifth lens and / or the sixth lens and / or the seventh lens are made of a glass material. Effect of the Invention

[0016] The beneficial effects of the present invention are as follows: The imaging optical lens according to the present invention has excellent optical properties, meets the requirements for a large aperture and a wide angle, and is particularly applicable to imaging lens units of mobile phones configured with imaging elements such as high-pixel CCD and CMOS, web imaging lenses, and laser radar lenses.

[0017] In order to more clearly explain the technical solutions of the embodiments of the present invention, the following briefly introduces drawings required for the embodiments. Obviously, the drawings described below are only some embodiments of the present invention, and those skilled in the art can further obtain other drawings based on these drawings without any creative work. [Brief description of the drawings]

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

[0019] In order to make the objectives, solutions and advantages of the present invention clearer, the following describes in detail each embodiment of the present invention with reference to the drawings. However, it is understood by those skilled in the art that many technical details are described in each embodiment of the present invention to better understand the present invention. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solution claimed by the present invention can be realized.

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

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

[0022] The first lens L1 is a spherical lens, the second lens L2 is an aspheric lens, the third lens L3 is an aspheric lens, the fourth lens L4 is a spherical lens, the fifth lens L5 is a spherical lens, the sixth lens L6 is a spherical lens, and the seventh lens L7 is an aspheric lens.

[0023] In this embodiment, if the central radius of curvature of the object side surface of the fourth lens L4 is defined as R7 and the central radius of curvature of the image side surface of the fourth lens L4 is defined as R8, the conditional formula 1.00≦R7 / R8≦3.00 is satisfied. This conditional formula defines the shape of the fourth lens L4 and can effectively balance the amount of field curvature of the system so that the offset amount of field curvature of the central field is less than 0.01 mm.

[0024] In this embodiment, if the angle of view of the imaging optical lens 10 is defined as FOV and the aperture value of the imaging optical lens 10 is defined as Fno, the conditional expression 80.00≦FOV / Fno≦120.00 is satisfied, and within the defined range, it is possible to effectively have both a large angle of view and a large aperture. Preferably, the conditional expressions Fno≦1.35 and FOV≧108.00 are satisfied.

[0025] In this embodiment, if the optical length of the imaging optical lens 10 is defined as TTL and the axial thickness of the second lens L2 is defined as d3, the conditional formula 10.00≦TTL / d3≦20.00 is satisfied. This conditional formula specifies the ratio between the optical length TTL of the imaging optical lens 10 and the axial thickness d3 of the second lens L2, and is advantageous for compressing the overall length of the optical system within the range of the conditional formula.

[0026] In this embodiment, if the focal length of the sixth lens L6 is defined as f6 and the focal length of the seventh lens L7 is defined as f7, the conditional formula -4.00≦f6 / f7≦-1.00 is satisfied. This conditional formula specifies the ratio between the focal length of the sixth lens L6 and the focal length of the seventh lens L7, and the values ​​of the focal lengths of both lenses become closer, which is favorable for a gradual transition of light rays and improves image quality.

[0027] When the angle of view of the imaging optical lens 10 of the present invention, the aperture value of the imaging optical lens 10, the optical length of the imaging optical lens 10, the thickness of the associated lenses, the focal length of the associated lenses, the central radii of curvature of the object-side surfaces and the central radii of curvature of the image-side surfaces of the associated lenses satisfy the above conditional expressions, the imaging optical lens 10 can achieve a large aperture and wide angle and have good optical performance.

[0028] In this embodiment, if the axial thickness of the third lens L3 is defined as d5 and the axial thickness of the fourth lens L4 is defined as d7, the conditional formula 0.80≦d5 / d7≦4.00 is satisfied. This conditional formula specifies the ratio between the thickness of the third lens L3 and the thickness of the fourth lens L4, and within the range of the conditional formula, it is advantageous for compressing the overall length of the optical system.

[0029] In this embodiment, if the central radius of curvature of the object side surface of first lens L1 is defined as R1 and the central radius of curvature of the image side surface of first lens L1 is defined as R2, the conditional formula 1.20≦(R1+R2) / (R1−R2)≦3.00 is satisfied. This conditional formula specifies the shape of first lens L1, and can reduce the degree of deflection of light passing through the lens, effectively correcting aberrations and making it possible to make chromatic aberration |LC|≦5.00 μm.

[0030] In this embodiment, if the focal length of the fifth lens L5 is defined as f5 and the focal length of the imaging optical lens 10 is defined as f, the conditional formula 1.50≦f5 / f≦5.00 is satisfied. This conditional formula specifies the ratio between the focal length f5 of the fifth lens L5 and the focal length f of the imaging optical lens 10, and by appropriately allocating the optical focal length of the system, the system has excellent imaging quality and low sensitivity.

[0031] In this embodiment, the object side surface of the first lens L1 is a paraxially convex surface, and the image side surface of the first lens L1 is a paraxially concave surface, and the first lens L1 has a negative refractive power. In other optional embodiments, the object side surface and the image side surface of the first lens L1 may be arranged in other concave-convex distribution conditions, and the first lens L1 may have a positive refractive power.

[0032] If the focal length of the first lens L1 is defined as f1, the conditional formula -5.62≦f1 / f≦-1.07 is satisfied. This conditional formula specifies the ratio between the focal length f1 of the first lens L1 and the focal length f of the imaging optical lens 10, and by appropriately distributing the refractive power, the lens has excellent imaging quality and low sensitivity. Preferably, the conditional formula -3.52≦f1 / f≦-1.34 is satisfied.

[0033] In this embodiment, if the axial thickness of the first lens L1 is defined as d1, the conditional formula 0.01≦d1 / TTL≦0.15 is satisfied. This conditional formula specifies the ratio between the axial thickness d1 of the first lens L1 and the optical length TTL of the imaging optical lens 10, and is advantageous for achieving a very thin structure. Preferably, the conditional formula 0.01≦d1 / TTL≦0.12 is satisfied.

[0034] In this embodiment, the object side surface of the second lens L2 is a paraxial concave surface, and the image side surface of the second lens L2 is a paraxial convex surface, and the second lens L2 has a negative refractive power. In other optional embodiments, the object side surface and the image side surface of the second lens L2 may be arranged in other concave-convex distribution conditions, and the second lens L2 may have a positive refractive power.

[0035] In this embodiment, if the focal length of the second lens L2 is defined as f2, the conditional formula -150.64≦f2 / f≦-2.60 is satisfied. This conditional formula specifies the ratio between the focal length f2 of the second lens L2 and the focal length f of the imaging optical lens 10, and the refractive power is appropriately distributed so that the lens has excellent imaging quality and low sensitivity. Preferably, the conditional formula -94.15≦f2 / f≦-3.25 is satisfied.

[0036] In this embodiment, if the radius of curvature of the center of the object side surface of the second lens L2 is defined as R3 and the radius of curvature of the center of the image side surface of the second lens L2 is defined as R4, the conditional formula -26.46≦(R3+R4) / (R3-R4)≦-2.45 is satisfied. This conditional formula specifies the shape of the second lens L2, and within the specified range, it is possible to reduce the degree of deflection of light passing through the lens, which is advantageous for correcting problems such as aberrations of off-axis angles of view. Preferably, the conditional formula -16.54≦(R3+R4) / (R3-R4)≦-3.06 is satisfied.

[0037] In this embodiment, the object side surface of the third lens L3 is a paraxially convex surface, and the image side surface of the third lens L3 is a paraxially convex surface, and the third lens L3 has a positive refractive power. In other optional embodiments, the object side surface and the image side surface of the third lens L3 may be arranged in other concave-convex distribution conditions, and the third lens L3 may have a negative refractive power.

[0038] In this embodiment, when the focal length of the third lens L3 is defined as f3, the conditional expression 0.80≦f3 / f≦3.50 is satisfied. This conditional expression specifies the ratio between the focal length f3 of the third lens L3 and the focal length f of the imaging optical lens 10, and the refractive power is appropriately distributed, so that the lens has excellent imaging quality and low sensitivity. Preferably, the conditional expression 1.28≦f3 / f≦2.80 is satisfied.

[0039] In this embodiment, 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 surface of the third lens L3 is defined as R6. The conditional formula 0.33≦(R5+R6) / (R5-R6)≦1.14 is satisfied. This conditional formula specifies the shape of the third lens L3, and within the specified range, it is possible to reduce the degree of deflection of light passing through the lens, which is advantageous for correcting problems such as aberrations of off-axis angles of view. Preferably, the conditional formula 0.52≦(R5+R6) / (R5-R6)≦0.91 is satisfied.

[0040] In this embodiment, the axial thickness d5 of the third lens L3 and the optical length TTL of the imaging optical lens 10 satisfy the conditional expression 0.04≦d5 / TTL≦0.28. This conditional expression defines the ratio between the axial thickness d5 of the third lens L3 and the optical length TTL of the imaging optical lens 10, and is advantageous for achieving a very thin structure. Preferably, the conditional expression 0.07≦d5 / TTL≦0.22 is satisfied.

[0041] In this embodiment, the object side surface of the fourth lens L4 is a paraxial convex surface, and the image side surface of the fourth lens L4 is a paraxial concave surface, and the fourth lens L4 has a negative refractive power. In other optional embodiments, the object side surface and the image side surface of the fourth lens L4 may be arranged in other concave-convex distribution conditions, and the fourth lens L4 may have a positive refractive power.

[0042] In this embodiment, the focal length f4 of the fourth lens L4 and the focal length f of the imaging optical lens 10 satisfy the conditional formula -19.73 ≦ f4 / f ≦ 212.93. This conditional formula specifies the ratio between the focal length f4 of the fourth lens L4 and the focal length f of the imaging optical lens 10, and the refractive power is appropriately distributed, so that the lens has excellent imaging quality and low sensitivity. Preferably, the conditional formula -12.33 ≦ f4 / f ≦ 170.35 is satisfied.

[0043] In this embodiment, the axial thickness d7 of the fourth lens L4 and the optical length TTL of the imaging optical lens 10 satisfy the conditional expression 0.02≦d7 / TTL≦0.25. This conditional expression defines the ratio between the axial thickness d7 of the fourth lens L4 and the optical length TTL of the imaging optical lens 10, and is advantageous for achieving a very thin structure. Preferably, the conditional expression 0.04≦d7 / TTL≦0.20 is satisfied.

[0044] In this embodiment, the object side surface of the fifth lens L5 is a paraxial concave surface, and the image side surface of the fifth lens L5 is a paraxial convex surface, and the fifth lens L5 has a positive refractive power. In other optional embodiments, the object side surface and the image side surface of the fifth lens L5 may be arranged in other concave-convex distribution conditions, and the fifth lens L5 may have a negative refractive power.

[0045] In this embodiment, 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 conditional formula 0.18≦(R9+R10) / (R9-R10)≦2.37 is satisfied. This conditional formula specifies the shape of the fifth lens L5, and within the specified range, it is possible to reduce the degree of deflection of light passing through the lens, which is advantageous for correcting problems such as aberrations of off-axis angles of view. Preferably, the conditional formula 0.29≦(R9+R10) / (R9-R10)≦1.89 is satisfied.

[0046] In this embodiment, when the axial thickness of the fifth lens L5 is defined as d9, the conditional formula 0.02≦d9 / TTL≦0.11 is satisfied. This conditional formula specifies the ratio of the axial thickness d9 of the fifth lens L5 to the optical length TTL of the imaging optical lens 10, and is advantageous for achieving a very thin structure. Preferably, the conditional formula 0.04≦d9 / TTL≦0.09 is satisfied.

[0047] In this embodiment, the sixth lens L6 has a paraxially convex object side surface and a paraxially concave image side surface, and the sixth lens L6 has a negative refractive power. In other alternative embodiments, the object side surface and the image side surface of the sixth lens L6 may be arranged in other concave-convex distribution conditions, and the sixth lens L6 may have a positive refractive power.

[0048] In this embodiment, the focal length f6 of the sixth lens L6 and the focal length of the imaging optical lens 10 satisfy the conditional expression -33.00≦f6 / f≦-3.68. This conditional expression specifies the ratio between the focal length f6 of the sixth lens L6 and the focal length f of the imaging optical lens 10, and the refractive power is appropriately distributed so that the lens has excellent imaging quality and low sensitivity. Preferably, the conditional expression -20.62≦f6 / f≦-4.60 is satisfied.

[0049] In this embodiment, if 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, the conditional formula -0.53≦(R11+R12) / (R11-R12)≦8.71 is satisfied. This conditional formula defines the shape of the sixth lens L6, and within the defined range, it is possible to reduce the degree of deflection of light passing through the lens, which is advantageous for correcting problems such as aberrations of off-axis angles of view. Preferably, the conditional formula -0.33≦(R11+R12) / (R11-R12)≦6.97 is satisfied.

[0050] In this embodiment, when the axial thickness of the sixth lens L6 is defined as d11, the conditional formula 0.05≦d11 / TTL≦0.22 is satisfied. This conditional formula specifies the ratio of the axial thickness d11 of the sixth lens L6 to the optical length TTL of the imaging optical lens 10, and is advantageous for achieving a very thin structure. Preferably, the conditional formula 0.08≦d11 / TTL≦0.18 is satisfied.

[0051] In this embodiment, the seventh lens L7 has a paraxially convex object side surface and a paraxially concave image side surface, and the seventh lens L7 has a positive refractive power. In other optional embodiments, the object side surface and the image side surface of the seventh lens L7 may be arranged in other concave-convex distribution conditions, and the seventh lens L7 may have a negative refractive power.

[0052] In this embodiment, the focal length f7 of the seventh lens L7 and the focal length of the imaging optical lens 10 satisfy the conditional expression 1.66≦f7 / f≦8.62. This conditional expression specifies the ratio between the focal length f7 of the seventh lens L7 and the focal length f of the imaging optical lens 10, and by appropriately distributing the refractive power, the lens has excellent imaging quality and low sensitivity. Preferably, the conditional expression 2.66≦f7 / f≦6.89 is satisfied.

[0053] In this embodiment, if the radius of curvature of the center of the object side surface of the seventh lens L7 is defined as R13 and the radius of curvature of the center of the image side surface of the seventh lens L7 is defined as R14, the conditional formula -16.02 ≦ (R13 + R14) / (R13 - R14) ≦ -0.65 is satisfied. This conditional formula defines the shape of the seventh lens L7, and within the defined range, it is possible to reduce the degree of deflection of light passing through the lens, which is advantageous for correcting problems such as aberration of the off-axis angle of view. Preferably, the conditional formula -10.01 ≦ (R13 + R14) / (R13 - R14) ≦ -0.81 is satisfied.

[0054] In this embodiment, when the axial thickness of the seventh lens L7 is defined as d13, the conditional formula 0.02≦d13 / TTL≦0.10 is satisfied. This conditional formula specifies the ratio between the axial thickness d13 of the seventh lens L7 and the optical length TTL of the imaging optical lens 10, and is advantageous for achieving a very thin structure. Preferably, the conditional formula 0.04≦d13 / TTL≦0.08 is satisfied.

[0055] The imaging optical lens 10 of the present invention will be described below using examples. The symbols used in each example indicate the following: The focal length, axial distance, central radius of curvature, axial thickness, and inflection point position are all in mm.

[0056] TTL: Optical length (the axial distance from the object side surface of the first lens L1 to the image plane Si), in mm.

[0057] In addition, inflection points and / or stationary points may be further set on the object side and / or image side of each lens to meet high-quality imaging needs, and specific embodiments are given below.

[0058] Table 1 shows the design data of the imaging optical lens 10 according to the first embodiment of the present invention.

[0059] [Table 1]

[0060] The meanings of the symbols are as follows: S1: Aperture R: Central radius of curvature at the center of the optical surface R1: The central radius of curvature of the object side of the first lens L1 R2: Radius of curvature of the center 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: Radius of curvature of the center 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: The 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: The 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: Radius of curvature of the center 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 curvature of the center of the image side of the sixth lens L6 R13: The central radius of curvature of the object side of the seventh lens L7 R14: Radius of curvature of the center of the image side of the seventh lens L7 R15: The central curvature radius of the object side of the optical filter GF R16: Radius of curvature of the center of the image side of the optical filter GF d: Axial thickness of lens, axial distance between lenses d0: The axial distance from the aperture 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: Axial distance from the image side surface of the sixth lens L6 to the object side surface 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: On-axis thickness of optical filter GF d16: The axial distance from the image side of the optical filter GF to the image plane Si nd: Refractive index of d line nd1: refractive index of the first lens L1 at the d line nd2: refractive index of the d line of the second lens L2 nd3: refractive index of the d line of the third lens L3 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 d line of the seventh lens L7 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

[0061] Table 2 shows aspheric data of the second lens L2, the third lens L3 and the seventh lens L7 in the imaging optical lens 10 according to the first embodiment of the present invention.

[0062] [Table 2]

[0063] Here, k is a conic coefficient, and A4, A6, A8, A10, A12, A14, A16, A18, A20, and A22 are aspheric coefficients.

[0064] y=(x 2 / R) / [1+{1―(k+1)(x 2 / R 2 )} 1 / 2 ]+A4x 4 +A6x 6 +A8x8 +A10x 10 +A12x 12 +A14x 14 +A16x 16 +A18x 18 +A20x 20 +A22x 22 (twenty five)

[0065] Here, x is the perpendicular distance between a point on the aspheric curve and the optical axis, and y is the aspheric depth (the perpendicular distance between a point on the aspheric surface that is x away from the optical axis and a tangent plane that is tangent to the vertex of the aspheric surface on the optical axis).

[0066] For convenience, the aspheric surface of each lens surface is expressed by the above formula (25). However, the present invention is not particularly limited to the aspheric polynomial of this formula (25).

[0067] Table 3 shows the design data of the inflection points of each lens in the imaging optical lens 10 according to the first embodiment of the present invention. Here, P1R1 and P1R2 indicate the object side surface and the image side surface of the first lens L1, P2R1 and P2R2 indicate the object side surface and the image side surface of the second lens L2, P3R1 and P3R2 indicate the object side surface and the image side surface of the third lens L3, P4R1 and P4R2 indicate the object side surface and the image side surface of the fourth lens L4, P5R1 and P5R2 indicate the object side surface and the image side surface of the fifth lens L5, P6R1 and P6R2 indicate the object side surface and the image side surface of the sixth lens L6, and P7R1 and P7R2 indicate the object side surface and the image side surface of the seventh lens L7. The corresponding data in 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 imaging optical lens 10.

[0068] [Table 3]

[0069] Fig. 2 is a schematic diagram showing the field curvature and distortion aberration after light with a wavelength of 940 nm passes through the imaging optical lens 10. The field curvature S in Fig. 2 is the field curvature in the sagittal direction, and T is the field curvature in the tangential direction. Figs. 3 and 4 are schematic diagrams showing the magnification chromatic aberration and axial chromatic aberration after light with wavelengths of 930 nm, 940 nm, and 950 nm, respectively, passes through the imaging optical lens 10.

[0070] As shown in Table 22, the first embodiment satisfies each of the conditional expressions.

[0071] In this embodiment, the entrance pupil diameter ENPD of the imaging optical lens 10 is 7.444 mm, the full field of view image height IH in the diagonal direction is 11.851 mm, and the diagonal angle of view FOV is 136.35°. The imaging optical lens 10 satisfies the design requirements for a large aperture and a wide angle, and its on-axis and off-axis chromatic aberrations are sufficiently corrected, resulting in excellent optical characteristics.

[0072] Second embodiment FIG. 5 is a schematic diagram showing the configuration of the imaging optical lens 20 in the second embodiment. The second embodiment is basically the same as the first embodiment, and the symbols have the same meanings as in the first embodiment. Therefore, the same parts will not be described repeatedly here, and only the differences will be described below.

[0073] In this embodiment, the fourth lens L4 has positive refractive power.

[0074] Table 4 shows design data of the imaging optical lens 20 according to the second embodiment of the present invention.

[0075] [Table 4]

[0076] Table 5 shows aspheric data of the second lens L2, the third lens L3 and the seventh lens L7 in the imaging optical lens 20 according to the second embodiment of the present invention.

[0077] [Table 5]

[0078] Table 6 shows the design data of the inflection points of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.

[0079] [Table 6]

[0080] Fig. 6 is a schematic diagram showing the field curvature and distortion aberration after light with a wavelength of 940 nm passes through the imaging optical lens 20. The field curvature S in Fig. 6 is the field curvature in the sagittal direction, and T is the field curvature in the tangential direction. Figs. 7 and 8 are schematic diagrams showing the magnification chromatic aberration and axial chromatic aberration after light with wavelengths of 930 nm, 940 nm, and 950 nm, respectively, passes through the imaging optical lens 20.

[0081] As shown in Table 22, the second embodiment satisfies each of the conditional expressions.

[0082] In this embodiment, the entrance pupil diameter ENPD of the imaging optical lens 20 is 6.829 mm, the full field of view image height IH in the diagonal direction is 11.851 mm, and the diagonal angle of view FOV is 142.36°. The imaging optical lens 20 satisfies the design requirements for a large aperture and a wide angle, and its on-axis and off-axis chromatic aberrations are sufficiently corrected, resulting in excellent optical characteristics.

[0083] Third embodiment FIG. 9 is a schematic diagram showing the configuration of the imaging optical lens 30 in the 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. Therefore, the same parts will not be described repeatedly here, and only the differences will be described below.

[0084] Table 7 shows design data for the imaging optical lens 30 according to the third embodiment of the present invention.

[0085] [Table 7]

[0086] Table 8 shows aspheric data of the second lens L2, the third lens L3 and the seventh lens L7 in the imaging optical lens 30 according to the third embodiment of the present invention.

[0087] [Table 8]

[0088] Table 9 shows design data for the inflection points of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.

[0089] [Table 9]

[0090] Table 10 shows the design data of the stationary points of each lens in the imaging optical lens 30 according to the third embodiment of the present invention. Here, P1R1 and P1R2 respectively indicate the object side surface and the image side surface of the first lens L1, P2R1 and P2R2 respectively indicate the object side surface and the image side surface of the second lens L2, P3R1 and P3R2 respectively indicate the object side surface and the image side surface of the third lens L3, P4R1 and P4R2 respectively indicate the object side surface and the image side surface of the fourth lens L4, P5R1 and P5R2 respectively indicate the object side surface and the image side surface of the fifth lens L5, P6R1 and P6R2 respectively indicate the object side surface and the image side surface of the sixth lens L6, and P7R1 and P7R2 respectively indicate the object side surface and the image side surface of the seventh lens L7. The corresponding data in the "stationary point position" column is the vertical distance from the stationary point set on the surface of each lens to the optical axis of the imaging optical lens 10. The unit of the stop point position is mm.

[0091] [Table 10]

[0092] Fig. 10 is a schematic diagram showing the field curvature and distortion aberration after light with a wavelength of 940 nm passes through the imaging optical lens 30. The field curvature S in Fig. 10 is the field curvature in the sagittal direction, and T is the field curvature in the tangential direction. Figs. 11 and 12 are schematic diagrams showing the magnification chromatic aberration and axial chromatic aberration after light with wavelengths of 930 nm, 940 nm, and 950 nm, respectively, passes through the imaging optical lens 30.

[0093] As shown in Table 22, the third embodiment satisfies each of the conditional expressions.

[0094] In this embodiment, the entrance pupil diameter ENPD of the imaging optical lens 30 is 8.59 mm, the full field of view image height IH in the diagonal direction is 11.851 mm, and the diagonal angle of view FOV is 112.15°. The imaging optical lens 30 satisfies the design requirements for a large aperture and a wide angle, and its on-axis and off-axis chromatic aberrations are sufficiently corrected, resulting in excellent optical characteristics.

[0095] (Fourth embodiment) FIG. 13 is a schematic diagram showing the configuration of the imaging optical lens 40 in the 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. Therefore, the same parts will not be described repeatedly here, and only the differences will be described below.

[0096] In this embodiment, the object side surface of the fifth lens L5 is a paraxial convex surface, and the image side surface of the seventh lens L7 is a paraxial convex surface.

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

[0098] [Table 11]

[0099] Table 12 shows aspheric surface data of the second lens L2, the third lens L3 and the seventh lens L7 in the imaging optical lens 40 according to the fourth embodiment of the present invention.

[0100] [Table 12]

[0101] Tables 13 and 14 show 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.

[0102] [Table 13]

[0103] [Table 14]

[0104] Fig. 14 is a schematic diagram showing the field curvature and distortion aberration after light with a wavelength of 940 nm passes through the imaging optical lens 40. The field curvature S in Fig. 14 is the field curvature in the sagittal direction, and T is the field curvature in the tangential direction. Figs. 15 and 16 are schematic diagrams showing the magnification chromatic aberration and axial chromatic aberration after light with wavelengths of 930 nm, 940 nm, and 950 nm, respectively, passes through the imaging optical lens 40.

[0105] As shown in Table 22, the fourth embodiment satisfies each of the conditional expressions.

[0106] In this embodiment, the entrance pupil diameter ENPD of the imaging optical lens 40 is 7.001 mm, the full field of view image height IH in the diagonal direction is 11.851 mm, and the diagonal angle of view FOV is 160.77°. The imaging optical lens 40 satisfies the design requirements for a large aperture and a wide angle, and its on-axis and off-axis chromatic aberrations are sufficiently corrected, resulting in excellent optical characteristics.

[0107] Fifth embodiment FIG. 17 is a schematic diagram showing the configuration of the imaging optical lens 50 in the fifth embodiment. The fifth embodiment is basically the same as the first embodiment, and the symbols have the same meanings as in the first embodiment. Therefore, the same parts will not be described repeatedly here, and only the differences will be described below.

[0108] In this embodiment, the object side surface of the fifth lens L5 is a paraxial convex surface, and the object side surface of the sixth lens L6 is a paraxial concave surface.

[0109] Table 15 shows design data for the imaging optical lens 50 according to the fifth embodiment of the present invention.

[0110] [Table 15]

[0111] Table 16 shows aspheric data of the second lens L2, the third lens L3 and the seventh lens L7 in the imaging optical lens 50 according to the fifth embodiment of the present invention.

[0112] [Table 16]

[0113] Tables 17 and 18 show design data for the inflection points and stationary points of each lens in the imaging optical lens 50 according to the fifth embodiment of the present invention.

[0114] [Table 17]

[0115] [Table 18]

[0116] Fig. 18 is a schematic diagram showing the field curvature and distortion aberration after light with a wavelength of 940 nm passes through the imaging optical lens 50. The field curvature S in Fig. 18 is the field curvature in the sagittal direction, and T is the field curvature in the tangential direction. Figs. 19 and 20 are schematic diagrams showing the lateral chromatic aberration and axial chromatic aberration after light with wavelengths of 930 nm, 940 nm, and 950 nm, respectively, passes through the imaging optical lens 50.

[0117] As shown in Table 22, the fifth embodiment satisfies each of the conditional expressions.

[0118] In this embodiment, the entrance pupil diameter ENPD of the imaging optical lens 50 is 10.385 mm, the full field of view image height IH in the diagonal direction is 11.851 mm, and the diagonal angle of view FOV is 108.37°. The imaging optical lens 50 satisfies the design requirements for a large aperture and a wide angle, and its on-axis and off-axis chromatic aberrations are sufficiently corrected, resulting in excellent optical characteristics.

[0119] (Comparative Example)

[0120] FIG. 21 is a schematic diagram showing the structure of an imaging optical lens 60 in a comparative example, and since the meanings of the symbols are the same as those in the first embodiment, the same parts will not be described repeatedly here.

[0121] Table 19 shows the design data of the imaging optical lens 60 according to the comparative example of the present invention.

[0122] [Table 19]

[0123] Table 20 shows the aspheric data of the second lens L2, the third lens L3 and the seventh lens L7 in the imaging optical lens 60 according to a comparative example of the present invention.

[0124] [Table 20]

[0125] Table 21 shows the design data of the inflection points of each lens in the imaging optical lens 60 according to the comparative example of the present invention.

[0126] [Table 21]

[0127] Fig. 22 is a schematic diagram showing the field curvature and distortion aberration after light with a wavelength of 940 nm passes through the imaging optical lens 60. The field curvature S in Fig. 22 is the field curvature in the sagittal direction, and T is the field curvature in the tangential direction. Figs. 23 and 24 are schematic diagrams showing the lateral chromatic aberration and axial chromatic aberration after light with wavelengths of 930 nm, 940 nm, and 950 nm, respectively, passes through the imaging optical lens 60.

[0128] In this comparative example, the entrance pupil diameter ENPD of the imaging optical lens 60 is 5.801 mm, the image height IH of the full field of view in the diagonal direction is 11.851 mm, and the field angle FOV in the diagonal direction is 163.78°.

[0129] Table 22 shows various numerical values ​​and values ​​corresponding to parameters defined by conditional expressions in the first to fifth embodiments and the comparative example. Clearly, the imaging optical lens 60 of the comparative example does not satisfy the conditional expression 80.00≦FOV / Fno≦120.00. The imaging optical lens 60 cannot effectively combine an angle of view with a large aperture, and the optical performance is not sufficiently excellent.

[0130] [Table 22]

[0131] Here, f12 is the composite focal length of the first lens L1 and the second lens L2.

[0132] The above is merely an embodiment of the present invention, and those skilled in the art may make modifications without departing from the spirit of the present invention, all of which are within the scope of protection of the present invention.

Claims

1. 1. An imaging optical lens, comprising: The optical system is configured with, 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, a fifth lens having positive refractive power, a sixth lens having negative refractive power, and a seventh lens having positive refractive power, an imaging optical lens satisfying the following conditional expressions (1) to (5): 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, an angle of view of the imaging optical lens is FOV, an aperture value of the imaging optical lens is Fno, an optical length of the imaging optical lens is TTL, an axial thickness of the second lens is d3, a focal length of the sixth lens is f6, a focal length of the seventh lens is f7, an axial thickness of the third lens is d5, and an axial thickness of the fourth lens is d7. 1.00≦R7 / R8≦3.00 (1) 80.00≦FOV / Fno≦120.00 (2) 10.00≦TTL / d3≦20.00 (3) -4.00≦f6 / f7≦-1.00 (4) 0.80≦d5 / d7≦4.00 (5)

2. An imaging optical lens, The optical system is configured with, 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, a fifth lens having positive refractive power, a sixth lens having negative refractive power, and a seventh lens having positive refractive power, an imaging optical lens satisfying the following conditional expressions (1) to (4) and (6): 1.00≦R7 / R8≦3.00 (1) 80.00≦FOV / Fno≦120.00 (2) 10.00≦TTL / d3≦20.00 (3) -4.00≦f6 / f7≦-1.00 (4) 1.20≦(R1+R2) / (R1-R2)≦3.00 (6)

3. An imaging optical lens, The optical system is configured with, 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, a fifth lens having positive refractive power, a sixth lens having negative refractive power, and a seventh lens having positive refractive power, an imaging optical lens satisfying the following conditional expressions (1) to (4) and (7), when 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, an angle of view of the imaging optical lens is FOV, an aperture value of the imaging optical lens is Fno, an optical length of the imaging optical lens is TTL, an axial thickness of the second lens is d3, a focal length of the sixth lens is f6, a focal length of the seventh lens is f7, a focal length of the fifth lens is f5, and a focal length of the imaging optical lens is f: 1.00≦R7 / R8≦3.00 (1) 80.00≦FOV / Fno≦120.00 (2) 10.00≦TTL / d3≦20.00 (3) -4.00≦f6 / f7≦-1.00 (4) 1.50≦f5 / f≦5.00 (7)

4. An object side surface of the first lens is a paraxially convex surface, and an image side surface of the first lens is a paraxially concave surface, The imaging optical lens according to any one of claims 1 to 3, characterized in that, when a focal length of the first lens is f1, a focal length of the imaging optical lens is f, and an axial thickness of the first lens is d1, the imaging optical lens satisfies the following conditional expressions (8) and (9): −5.62≦f1 / f≦−1.07 (8) 0.01≦d1 / TTL≦0.15 (9)

5. An object side surface of the second lens is a paraxially concave surface, and an image side surface of the second lens is a paraxially convex surface, 4. The imaging optical lens according to claim 1, wherein the imaging optical lens satisfies the following conditional expressions (10) and (11), where a focal length of the second lens is f2, a focal length of the imaging optical lens is f, a central radius of curvature of the object-side surface of the second lens is R3, and a central radius of curvature of the image-side surface of the second lens is R4. −150.64≦f2 / f≦−2.60 (10) -26.46≦(R3+R4) / (R3-R4)≦-2.45 (11)

6. An object side surface of the third lens is a paraxially convex surface, and an image side surface of the third lens is a paraxially convex surface, the imaging optical lens according to any one of claims 1 to 3, wherein the imaging optical lens satisfies the following conditional expressions (12) to (14), where f3 is a focal length of the third lens, f is a focal length of the imaging optical lens, R5 is a central radius of curvature of the object side surface of the third lens, R6 is a central radius of curvature of the image side surface of the third lens, and d5 is an axial thickness of the third lens. 0.80≦f3 / f≦3.50 (12) 0.33≦(R5+R6) / (R5-R6)≦1.14 (13) 0.04≦d5 / TTL≦0.28 (14)

7. an object side surface of the fourth lens is a paraxially convex surface, and an image side surface of the fourth lens is a paraxially concave surface, The focal length of the fourth lens is f4, the focal length of the imaging optical lens is f, and the fourth lens is 4. The imaging optical lens according to claim 1, wherein the following conditional expressions (15) and (16) are satisfied when an axial thickness of the lens is d7. −19.73≦f4 / f≦212.93 (15) 0.02≦d7 / TTL≦0.25 (16)

8. The image side surface of the fifth lens is a convex surface paraxially, the imaging optical lens according to any one of claims 1 to 3, wherein the following conditional expressions (17) and (18) are satisfied when 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 axial thickness of the fifth lens is d9. 0.18≦(R9+R10) / (R9-R10)≦2.37 (17) 0.02≦d9 / TTL≦0.11 (18)

9. The image side surface of the sixth lens is paraxially concave, the imaging optical lens according to any one of claims 1 to 3, wherein the imaging optical lens satisfies the following conditional expressions (19) to (21), where f is a focal length of the imaging optical lens, R11 is a central radius of curvature of the object side surface of the sixth lens, R12 is a central radius of curvature of the image side surface of the sixth lens, and d11 is an axial thickness of the sixth lens. −33.00≦f6 / f≦−3.68 (19) -0.53≦(R11+R12) / (R11-R12)≦8.71 (20) 0.05≦d11 / TTL≦0.22 (21)

10. The object side surface of the seventh lens is a paraxially convex surface, the imaging optical lens according to any one of claims 1 to 3, wherein the imaging optical lens satisfies the following conditional expressions (22) to (24), where f is a focal length of the imaging optical lens, R13 is a central radius of curvature of the object side surface of the seventh lens, R14 is a central radius of curvature of the image side surface of the seventh lens, and d13 is an axial thickness of the seventh lens. 1.66≦f7 / f≦8.62 (22) -16.02≦(R13+R14) / (R13-R14)≦-0.65 (23) 0.02≦d13 / TTL≦0.10 (24)

11. The imaging optical lens according to any one of claims 1 to 3, characterized in that the first lens and / or the second lens and / or the third lens and / or the fourth lens and / or the fifth lens and / or the sixth lens and / or the seventh lens are made of a glass material.

Images