Image capturing optical lens

Abstract

To provide an optical lens, in particular an image capturing optical lens.SOLUTION: An image capturing optical lens of the present invention comprises seven lenses consisting of a first lens having positive refractive power, a second lens having negative refractive power, a third lens having negative 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, arranged in order from the object side to the image side, and satisfies the following conditional expressions: 0.20≤H0.6r9 / IH≤0.30, 16.00≤f1 / H0.6r1×tan(semi-FOV)≤30.00, -6.00≤(H0.6r14 / d13)×(f7 / f)≤-3.00.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 is applied to mobile terminal devices such as smartphones and digital cameras, and imaging devices such as monitors, PC lenses, and in-vehicle lenses. [Background technology]

[0002] In recent years, with the rise of various smart devices, the demand for miniaturized imaging optical lenses has been increasing. In addition to the pixel size of photosensitive elements being reduced, current electronic products are trending toward high functionality and lightweight, portable designs. Therefore, miniaturized imaging optical lenses with good imaging quality have become the mainstream in the current market. To achieve good imaging quality, a lens structure with many lenses is often adopted. Furthermore, with technological development and the increasing diversification of user needs, the pixel area of ​​photosensitive elements is shrinking, and the system requirements for imaging quality are increasing. Therefore, seven-lens structures are gradually appearing in lens designs. There is a demand for wide-angle imaging optical lenses that have excellent imaging performance, low sensitivity, good processability, compact size, and sufficient aberration correction. Summary of the Invention [Problem to be solved by the invention]

[0003] In view of the above problems, an object of the present invention is to provide an imaging optical lens that has excellent imaging performance and also satisfies design requirements such as a wide angle, low sensitivity, good workability, compactness, and sufficient correction of aberrations. [Means for solving the problem]

[0004] To achieve the above object, the solution of the present invention provides an imaging optical lens, which is composed of a total of seven lenses, which are, in order from the object side to the image side, a first lens having positive refractive power, a second lens having negative refractive power, a third lens having negative 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 first lens has an object-side surface that is convex at the paraxial line and an image-side surface that is concave at the paraxial line, the second lens has an object-side surface that is convex at the paraxial line and an image-side surface that is concave at the paraxial line, the third lens has an object-side surface that is concave at the paraxial line and an image-side surface that is concave at the paraxial line, the fourth lens has an object-side surface that is convex at the paraxial line and an image-side surface that is convex at the paraxial line, the fifth lens has an object-side surface that is convex at the paraxial line and an image-side surface that is concave at the paraxial line, the sixth lens has an object-side surface that is convex at the paraxial line and an image-side surface that is convex at the paraxial line, and the seventh lens has an object-side surface that is convex at the paraxial line and an image-side surface that is concave at the paraxial line, The focal length of the imaging optical lens is f, the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the focal length of the fifth lens is f5, the focal length of the seventh lens is f7, the central radius of curvature of the object side surface of the second lens in the paraxial direction is R3, the central radius of curvature of the image side surface of the second lens in the paraxial direction is R4, the central radius of curvature of the object side surface of the fifth lens in the paraxial direction is R9, the central radius of curvature of the image side surface of the fifth lens in the paraxial direction is R10, the on-axis thickness of the fifth lens is d9, When the axial thickness of the seventh lens is d13, the radial height of the intersection between the chief ray of a 0.6x field of view of the imaging optical lens and the object side surface of the first lens is H0.6r1, the radial height of the intersection between the chief ray of a 0.6x field of view of the imaging optical lens and the object side surface of the fifth lens is H0.6r9, the radial height of the intersection between the chief ray of a 0.6x field of view of the imaging optical lens and the image side surface of the seventh lens is H0.6r14, the image height of a 1.0 field of view of the imaging optical lens is IH, and half the angle of view of a 1.0 field of view of the imaging optical lens is semi-FOV, the following conditional expressions (1) to (7) are satisfied. 5.00≦(f4-f5) / f1≦12.00 (1) 2.10≦(R3+R4) / f≦3.50 (2) 20.00≦(R9+R10) / d9≦40.00 (3) -9.00≦(f2-f3) / f≦-3.00 (4) 0.20≦H0.6r9 / IH≦0.30 (5) 16.00≦f1 / H0.6r1×tan(semi-FOV)≦30.00 (6) -6.00≦(H0.6r14 / d13)×(f7 / f)≦-3.00 (7)

[0005] Preferably, the following conditional expression (8) is satisfied: 2.10≦(R3+R4) / f≦2.90 (8)

[0006] Preferably, the following conditional expression (9) is satisfied. -7.70≦(f2-f3) / f≦-3.00 (9)

[0007] Preferably, the following conditional expression (10) is satisfied. 19.00≦f1 / H0.6r1×tan(semi-FOV)≦25.50 (10)

[0008] Preferably, the following conditional expression (11) is satisfied. -5.30≦(H0.6r14 / d13)×(f7 / f)≦-3.70 (11)

[0009] Preferably, when the focal length of the sixth lens is f6, the following conditional expression (12) is satisfied: -1.80≦f6 / f7≦-0.90 (12)

[0010] Preferably, the following conditional expression (13) is satisfied: -1.55≦f6 / f7≦-1.10 (13)

[0011] Preferably, the first lens is made of a glass material.

[0012] The solution of the present invention further provides an imaging optical lens, which is composed of a total of seven lenses, which are, in order from the object side to the image side, a first lens having positive refractive power, a second lens having negative refractive power, a third lens having negative 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 first lens has an object-side surface that is convex at the paraxial line and an image-side surface that is concave at the paraxial line, the second lens has an object-side surface that is convex at the paraxial line and an image-side surface that is concave at the paraxial line, the third lens has an object-side surface that is concave at the paraxial line and an image-side surface that is concave at the paraxial line, the fourth lens has an object-side surface that is convex at the paraxial line and an image-side surface that is convex at the paraxial line, the fifth lens has an object-side surface that is convex at the paraxial line and an image-side surface that is concave at the paraxial line, the sixth lens has an object-side surface that is convex at the paraxial line and an image-side surface that is convex at the paraxial line, and the seventh lens has an object-side surface that is convex at the paraxial line and an image-side surface that is concave at the paraxial line, a focal length of the imaging optical lens is f, a focal length of the first lens is f1, a focal length of the fifth lens is f5, a focal length of the seventh lens is f7, a central radius of curvature of the object-side surface of the first lens in the paraxial direction is R1, a central radius of curvature of the image-side surface of the first lens in the paraxial direction is R2, a central radius of curvature of the object-side surface of the third lens in the paraxial direction is R5, a central radius of curvature of the image-side surface of the third lens in the paraxial direction is R6, an axial distance from the image-side surface of the second lens to the object-side surface of the third lens is d4, an axial thickness of the third lens is d5, and an axial distance from the image-side surface of the third lens to the object-side surface of the fourth lens. is d6, the axial thickness of the seventh lens is d13, the radial height of the intersection of the chief ray of a 0.6x field of view of the imaging optical lens and the object side surface of the first lens is H0.6r1, the radial height of the intersection of the chief ray of a 0.6x field of view of the imaging optical lens and the object side surface of the fifth lens is H0.6r9, the radial height of the intersection of the chief ray of a 0.6x field of view of the imaging optical lens and the image side surface of the seventh lens is H0.6r14, the image height of a 1.0 field of view of the imaging optical lens is IH, and half the angle of view of a 1.0 field of view of the imaging optical lens is semi-FOV, the following conditional expressions (5) to (7) and (14) to (17) are satisfied. 0.20≦H0.6r9 / IH≦0.30 (5) 16.00≦f1 / H0.6r1×tan(semi-FOV)≦30.00 (6) -6.00≦(H0.6r14 / d13)×(f7 / f)≦-3.00 (7) 0.21≦R1 / R2≦0.42 (14) 0.30≦d5 / (d4+d6)≦0.55 (15) -3.45≦R5 / R6≦-0.20 (16) 11.60≦f5 / f≦-3.00 (17)

[0013] Preferably, the following conditional expression (18) is satisfied: 0.25≦R1 / R2≦0.35 (18)

[0014] Preferably, the following conditional expression (19) is satisfied: 0.35≦d5 / (d4+d6)≦0.45 (19)

[0015] Preferably, the following conditional expression (20) is satisfied: -2.85≦R5 / R6≦-0.20 (20)

[0016] Preferably, the following conditional expression (21) is satisfied: -10.00≦f5 / f≦-3.50 (21)

[0017] Preferably, the following conditional expression (10) is satisfied. 19.00≦f1 / H0.6r1×tan(semi-FOV)≦25.50 (10)

[0018] Preferably, the following conditional expression (11) is satisfied. -5.30≦(H0.6r14 / d13)×(f7 / f)≦-3.70 (11)

[0019] Preferably, the following conditional expression (22) is satisfied: 1.00≦f1 / f≦1.40 (22)

[0020] Preferably, the following conditional expression (23) is satisfied: 1.05≦f1 / f≦1.25 (23)

[0021] Preferably, when the axial thickness of the first lens is d1 and the optical length of the imaging optical lens is TTL, the following conditional expression (24) is satisfied: 0.09≦d1 / TTL≦0.16 (24)

[0022] Preferably, the following conditional expression (25) is satisfied: 0.10≦d1 / TTL≦0.14 (25)

[0023] Preferably, the first lens is made of a glass material. [Effects of the Invention]

[0024] The beneficial effects of the present invention are as follows: The imaging optical lens of the present invention has excellent imaging performance, and satisfies design requirements such as a wide angle, low sensitivity, good processability, compact size, and sufficient correction of aberrations, and is particularly applicable to imaging lens units for mobile phones, web imaging lenses, and vehicle-mounted lenses that are configured with imaging elements such as high-pixel CCDs and CMOSs.

[0025] In order to more clearly explain the technical solutions of the embodiments of the present invention, the following briefly introduces the 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 explanation of the drawings]

[0026] [Figure 1] 1 is a schematic diagram showing the configuration of an imaging optical lens according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a schematic diagram of axial chromatic aberration of the imaging optical lens shown in FIG. [Figure 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 the curvature of field and distortion of the imaging optical lens shown in FIG. [Figure 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] FIG. 6 is a schematic diagram showing the longitudinal chromatic aberration of the imaging optical lens shown in FIG. [Figure 7] FIG. 6 is a schematic diagram showing chromatic aberration of magnification of the imaging optical lens shown in FIG. [Figure 8] 6 is a schematic diagram showing the curvature of field and distortion of the imaging optical lens shown in FIG. 5. [Figure 9] FIG. 10 is a schematic diagram showing the configuration of an imaging optical lens according to a third embodiment of the present invention. [Figure 10] FIG. 10 is a schematic diagram showing the longitudinal chromatic aberration of the imaging optical lens shown in FIG. [Figure 11] FIG. 10 is a schematic diagram showing chromatic aberration of magnification of the imaging optical lens shown in FIG. [Figure 12] 10A and 10B are schematic diagrams showing the curvature of field and distortion of the imaging optical lens shown in FIG. [Figure 13] FIG. 10 is a schematic diagram showing the configuration of an imaging optical lens according to a fourth embodiment of the present invention. [Figure 14] FIG. 14 is a schematic diagram showing the longitudinal chromatic aberration of the imaging optical lens shown in FIG. [Figure 15] FIG. 14 is a schematic diagram showing chromatic aberration of magnification of the imaging optical lens shown in FIG. [Figure 16] 14 is a schematic diagram showing the curvature of field and distortion of the imaging optical lens shown in FIG. 13. DETAILED DESCRIPTION OF THE INVENTION

[0027] In order to make the objectives, solutions, and advantages of the present invention clearer, the following detailed description of each embodiment of the present invention will be given with reference to the accompanying drawings. It will be understood by those skilled in the art that many technical details are provided in each embodiment of the present invention to better understand the present invention. However, the technical solution to be protected by the present invention can be realized without these technical details and various changes and modifications based on the following embodiments.

[0028] As shown in Figures 1 to 16, the technical solution of the present invention provides imaging optical lenses 10, 20, 30, and 40. Figures 1, 5, 9, and 13 show imaging optical lenses 10, 20, 30, and 40 according to the present invention, each of which includes seven lenses in total. Specifically, the imaging optical lens includes, in order from the object side to the image side, a first lens L1, a second lens L2, a third lens L3, 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 the image plane Si.

[0029] The first lens L1 is made of glass, the second lens L2 is made of plastic, the third lens L3 is made of plastic, the fourth lens L4 is made of plastic, the fifth lens L5 is made of plastic, the sixth lens L6 is made of plastic, and the seventh lens L7 is made of plastic. The combination of glass and plastic lenses reduces chromatic aberration and improves the performance of the imaging optical lens. Each lens may be made of other materials.

[0030] The object-side and image-side surfaces of the first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6 and seventh lens L7 are all aspheric.

[0031] The object side surface of the first lens L1 is a paraxially convex surface, and the image side surface is a paraxially concave surface, and the first lens L1 has positive refractive power. The object side surface and the image side surface of the first lens L1 may be arranged in other concave / convex distribution conditions.

[0032] The object side surface of the second lens L2 is a paraxially convex surface, and the image side surface is a paraxially concave surface, and the first lens L2 has negative refractive power. The object side surface and the image side surface of the first lens L2 may be arranged in other concave / convex distributions.

[0033] The third lens L3 has a paraxially concave object side surface and a paraxially concave image side surface, and has negative refractive power. The object side and image side surfaces of the third lens L3 may be arranged in other concave / convex distributions.

[0034] The fourth lens L4 has a paraxially convex object side surface and a paraxially convex image side surface, and has positive refractive power. The object side and image side surfaces of the fourth lens L4 may be arranged in other concave / convex distributions.

[0035] The fifth lens L5 has a paraxially convex object side surface and a paraxially concave image side surface, and has negative refractive power. The object side and image side surfaces of the fifth lens L5 may be arranged in other concave / convex distributions.

[0036] The sixth lens L6 has a paraxially convex object side surface and a paraxially convex image side surface, and has positive refractive power. The object side and image side surfaces of the sixth lens L6 may be arranged in other concave / convex distributions.

[0037] The seventh lens L7 has a paraxially convex object side surface and a paraxially concave image side surface, and has negative refractive power. The object side and image side surfaces of the seventh lens L7 may be arranged in other concave / convex distributions.

[0038] If the focal length of the first lens is defined as f1, the focal length of the fourth lens as f4, and the focal length of the fifth lens as f5, then the conditional expression 5.00≦(f4−f5) / f1≦12.00 is satisfied. Within the range of this conditional expression, it is advantageous to rationally allocate the power of the imaging optical lens, so that the imaging optical lens has good imaging quality and effectively reduces the sensitivity of the imaging optical lens.

[0039] If the paraxial central radius of curvature of the object-side surface of the second lens is defined as R3, the paraxial central radius of curvature of the image-side surface of the second lens is defined as R4, and the focal length of the imaging optical lens is defined as f, the conditional expression 2.10≦(R3+R4) / f≦3.50 is satisfied. By rationally controlling the ratio between the sum of the radii of curvature of the object-side and image-side surfaces of the second lens and the total effective focal length of the system within the range of this conditional expression, the third-order coma aberration of the system can be controlled within a reasonable range, which is advantageous for balancing the amount of coma generated in the leading lens of the optical imaging system, and the system will have good imaging quality. Preferably, the conditional expression 2.10≦(R3+R4) / f≦2.90 is satisfied.

[0040] If the central radius of curvature of the object-side surface of the fifth lens at the paraxial direction is defined as R9, the central radius of curvature of the image-side surface of the fifth lens at the paraxial direction is defined as R10, and the on-axis thickness of the fifth lens is defined as d9, then the conditional expression 20.00≦(R9+R10) / d9≦40.00 is satisfied. By rationally designing the shape of the fifth lens within the range of this conditional expression, the refraction angle of light rays at the fifth lens can be optimized, which is advantageous for achieving a wider angle of view.

[0041] If the focal length of the imaging optical lens is defined as f, the focal length of the second lens as f2, and the focal length of the third lens as f3, the conditional expression -9.00≦(f2-f3) / f≦-3.00 is satisfied. Within the range of this conditional expression, it is advantageous for reducing the sensitivity to decentering and thickness of the second lens and for improving lens processing performance. Preferably, the conditional expression -7.70≦(f2-f3) / f≦-3.00 is satisfied.

[0042] If the radial height of the intersection of the chief ray in a 0.6x field of view of the imaging optical lens and the object-side surface of the fifth lens is defined as H0.6r9, and the image height of the imaging optical lens in a 1.0 field of view is defined as IH, then the conditional expression 0.20≦H0.6r9 / IH≦0.30 is satisfied. By rationally controlling the ratio of the radial height of the intersection of the chief ray in a 0.6x field of view and the object-side surface of the fifth lens (i.e., the vertical distance to the optical axis) to the image height within the range of this conditional expression, light rays have rational refraction angles from the fourth lens to the fifth lens, which is advantageous for realizing a wide-angle imaging optical lens.

[0043] If the focal length of the first lens is defined as f1, the radial height of the intersection of the chief ray of the 0.6x field of view of the imaging optical lens with the object-side surface of the first lens as H0.6r1, and half the angle of view of the 1.0 field of view of the imaging optical lens as semi-FOV, the conditional expression 16.00≦f1 / H0.6r1×tan(semi-FOV)≦30.00 is satisfied. By rationally controlling the relationship between the radial height of the intersection of the chief ray of the 0.6x field of view with the object-side surface of the first lens (i.e., the vertical distance to the optical axis) of the intersection of the chief ray of the 0.6x field of view with the focal length of the first lens and the half angle of view within the range of this conditional expression, the object-side surface of the first lens has an appropriate curvature, which is advantageous for achieving a wide angle of view. Preferably, the conditional expression 19.00≦f1 / H0.6r1×tan(semi-FOV)≦25.50 is satisfied.

[0044] If we define the focal length of the imaging optical lens as f, the focal length of the seventh lens as f7, the axial thickness of the seventh lens as d13, and the radial height of the intersection of the chief ray of the 0.6x field of view of the imaging optical lens with the image-side surface of the seventh lens as H0.6r14, then the conditional expression -6.00≦(H0.6r14 / d13)×(f7 / f)≦-3.00 is satisfied. Rational control within the range of this conditional expression of the relationship between the radial height of the intersection of the chief ray of the 0.6x field of view with the image-side surface of the seventh lens, the axial thickness of the seventh lens, the focal length, and the overall focal length is advantageous in further increasing the angle of view of the last lens and improving image quality. Preferably, the conditional expression -5.30≦(H0.6r14 / d13)×(f7 / f)≦-3.70 is satisfied.

[0045] If the focal length of the sixth lens is defined as f6 and the focal length of the seventh lens is defined as f7, the conditional expression -1.80≦f6 / f7≦-0.90 is satisfied. Within the range of this conditional expression, the refractive powers of the sixth lens and the seventh lens can be adjusted, contributing to volume compression and aberration correction. Preferably, the conditional expression -1.55≦f6 / f7≦-1.10 is satisfied.

[0046] If the paraxial central radius of curvature of the object-side surface of the first lens is defined as R1 and the paraxial central radius of curvature of the image-side surface of the first lens is defined as R2, the conditional expression 0.21≦R1 / R2≦0.42 is satisfied. By controlling the ratio of the paraxial radii of curvature of the object-side surface and the image-side surface of the first lens within the range of this conditional expression, the surface shape of the first lens can be adjusted, which contributes to adjusting the traveling direction of light rays and forming a wide-angle arrangement. Preferably, the conditional expression 0.25≦R1 / R2≦0.35 is satisfied.

[0047] If the axial distance from the image-side surface of the second lens to the object-side surface of the third lens is defined as d4, the axial thickness of the third lens as d5, and the axial distance from the image-side surface of the third lens to the object-side surface of the fourth lens as d6, the conditional expression 0.30≦d5 / (d4+d6)≦0.55 is satisfied. Controlling the ratio of the axial thickness of the third lens to the sum of the air gaps before and after it within the range of this conditional expression is advantageous for adjusting the optical path length of light rays in the third lens, and enables the angle of view to be increased without affecting image quality. Preferably, the conditional expression 0.35≦d5 / (d4+d6)≦0.45 is satisfied.

[0048] If the central radius of curvature of the object-side surface of the third lens at the paraxial direction is defined as R5 and the central radius of curvature of the image-side surface of the third lens at the paraxial direction is defined as R6, the conditional expression -3.45≦R5 / R6≦-0.20 is satisfied. Within the range of this conditional expression, the surface shape and refractive power of the third lens can be adjusted, contributing to aberration correction and compressed volume. Preferably, the conditional expression -2.85≦R5 / R6≦-0.20 is satisfied.

[0049] If the focal length of the imaging optical lens is defined as f and the focal length of the fifth lens is defined as f5, the conditional expression -11.60≦f5 / f≦-3.00 is satisfied. By effectively and rationally allocating power within the range of this conditional expression, the design requirements for a wide-angle system are met. Preferably, the conditional expression -10.00≦f5 / f≦-3.50 is satisfied.

[0050] If the focal length of the imaging optical lens is defined as f and the focal length of the first lens as f1, the conditional expression 1.00≦f1 / f≦1.40 is satisfied. By effectively and rationally allocating power within the range of this conditional expression, the design requirements for a wide-angle system are met. Preferably, the conditional expression 1.05≦f1 / f≦1.25 is satisfied.

[0051] If the axial thickness of the first lens is defined as d1 and the optical length of the imaging optical lens is defined as TTL, the conditional expression 0.09≦d1 / TTL≦0.16 is satisfied. This conditional expression is advantageous for achieving an extremely thin lens. Preferably, the conditional expression 0.10≦d1 / TTL≦0.14 is satisfied.

[0052] Compared with the prior art, the imaging optical lens according to the present invention is arranged to satisfy the conditional expressions 5.00≦(f4−f5) / f≦12.00, 2.10≦(R3+R4) / f≦3.50, 20.00≦(R9+R10) / d9≦40.00, −9.00≦(f2−f3) / f≦−3.00, 0.20≦H0.6r9 / IH≦0.30, 16.00≦f1 / H0.6r1×tan(semi-FOV)≦30.00, −6.00≦(H0.6r14 / d13)×(f7 / f)≦−3.00, so that the imaging optical lens has good imaging quality and effectively reduces the sensitivity of the imaging optical lens. It is advantageous to reduce the angle of view, furthermore to balance the amount of coma aberration that occurs in the front lens of the optical imaging system, which is advantageous to provide good imaging quality to the system, which is advantageous to realize a wide angle, which is advantageous to reduce the sensitivity to lens decentering and thickness, which is advantageous to improve the processing performance of the lens, which has a reasonable refraction angle for light rays from the fourth lens to the fifth lens, which is advantageous to realize a wide angle for the imaging optical lens, which has an appropriate curvature on the object side of the first lens, which is advantageous to realize a wide angle for the lens, and which is advantageous to further increase the angle of view of the last lens and improve image quality.

[0053] Furthermore, compared to the prior art, the present invention satisfies the following conditional expressions: 0.20≦H0.6r9 / IH≦0.30, 16.00≦f1 / H0.6r1×tan(semi-FOV)≦30.00, −6.00≦(H0.6r14 / d13)×(f7 / f)≦−3.00, 0.21≦R1 / R2≦0.42, 0.30≦d5 / (d4+d6)≦0.55, −3.45≦R5 / R6≦−0.20, −11.60≦f5 / f≦−3.00, so that light rays have a reasonable refraction angle from the fourth lens to the fifth lens, and the photographic image is easy to capture. It is advantageous to realize a wide angle of the imaging optical lens, the object side surface of the first lens has an appropriate curvature, which is advantageous to realize a wide angle, it is advantageous to further increase the angle of view of the last lens to improve image quality, it is advantageous to rationally adjust the traveling direction of light rays to form a wide angle arrangement, and it is advantageous to adjust the optical path length of light rays in the third lens, and while not affecting image quality, it increases the angle of view, contributes to aberration correction and compressed volume, and distributes power effectively and rationally, thereby satisfying the design requirements of a wide angle system.

[0054] The imaging optical lens of the present invention will be described below using examples. The symbols used in each example are as follows: The focal length, axial distance, central radius of curvature, and axial thickness are all in mm.

[0055] TTL: Optical length (the axial distance from the object side of the first lens L1 to the image plane Si), expressed in mm.

[0056] FNO: The ratio of the effective focal length of an imaging optical lens to the entrance pupil diameter.

[0057] The technical solution of the present invention will be specifically described below in four embodiments.

[0058] (First embodiment) Tables 1 and 2 show design data for the imaging optical lens 10 according to the first embodiment of the present invention.

[0059] [Table 1]

[0060] Here, the meaning of each symbol is as follows: S1: Aperture R: Radius of curvature at the center of the optical surface R1: central radius of curvature of the object side surface of the first lens L1 on the paraxial line R2: central radius of curvature of the image side surface of the first lens L1 on the paraxial line R3: The central radius of curvature of the object-side surface of the second lens L2 on the paraxial line R4: The central radius of curvature of the image side of the second lens L2 on the paraxial line R5: The central radius of curvature of the object-side surface of the third lens L3 on the paraxial line R6: The central radius of curvature of the image side of the third lens L3 on the paraxial line R7: The central radius of curvature of the object-side surface of the fourth lens L4 on the paraxial line R8: The central radius of curvature of the image side of the fourth lens L4 on the paraxial line R9: The central radius of curvature of the object-side surface of the fifth lens L5 on the paraxial line R10: The central radius of curvature of the image side of the fifth lens L5 on the paraxial line R11: The central radius of curvature of the object side surface of the sixth lens L6 on the paraxial line R12: The central radius of curvature of the image side of the sixth lens L6 on the paraxial line R13: The central radius of curvature of the object side surface of the seventh lens L7 on the paraxial line R14: The central radius of curvature of the seventh lens L7 on the image side at the paraxial R15: The central radius of curvature of the object-side surface of the optical filter GF on the paraxial line R16: Central radius of curvature of the image side of the optical filter GF on the paraxial line d: Axial thickness of lens, axial distance between lenses d0: On-axis distance from aperture S1 to the object side of the first lens L1 d1: Axial thickness of the first lens L1 d2: On-axis 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 element 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 element L3 d6: On-axis 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 element 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 element 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 element L6 d12: the axial distance from the image side surface of the sixth lens L6 to the object side surface of the seventh lens L7 d13: Axial thickness of the seventh lens element L7 d14: The axial distance from the image side surface of the seventh lens L7 to the object side surface of the optical filter GF d15: On-axis thickness of optical filter GF d16: On-axis distance from the image side of the optical filter GF to the image plane Si nd: Refractive index of the 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 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 element L3 v4: Abbe number of the fourth lens element L4 ν5: Abbe number of the fifth lens element L5 v6: Abbe number of the sixth lens element L6 v7: Abbe number of the seventh lens element L7 vg: Abbe number of the optical filter GF

[0061] Table 2 shows the aspheric surface data of each lens in the imaging optical lens 10 according to the first embodiment of the present invention.

[0062] [Table 2]

[0063] For convenience, the aspherical surface of each lens surface is expressed by the following formula (26): However, the present invention is not particularly limited to the form of the aspherical polynomial of formula (26).

[0064] 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 +A22r 22 +A24r 24 +A26r 26 +A28r 28 +A30r 30 (26)

[0065] where k is a conic coefficient, A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 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 a point on the aspheric surface that is at a distance r from the optical axis and a cross section of the aspheric surface that is tangent to the vertex on the optical axis).

[0066] 2 and 3 are schematic diagrams showing the axial chromatic aberration and chromatic aberration of magnification of light with wavelengths of 656 nm, 588 nm, 546 nm, 486 nm, and 436 nm, respectively, after passing through the imaging optical lens 10 according to the first embodiment. Fig. 4 is a schematic diagram showing the curvature of field and distortion aberration of light with wavelength of 546 nm after passing through the imaging optical lens 10 according to the first embodiment, where the curvature of field S in Fig. 4 is the curvature of field in the sagittal direction and T is the curvature of field in the tangential direction.

[0067] In this embodiment, the entrance pupil diameter ENPD of the imaging optical lens 10 is 4.868 mm, the image height IH of the full field of view (1.0 field of view) is 8.000 mm, the angle of view FOV in the diagonal direction of the full field of view (1.0 field of view) is 84.97°, the image height IH of the MIC field of view is 8.290 mm, and the angle of view FOV in the diagonal direction of the MIC field of view is 87.18°. The imaging optical lens 10 satisfies design requirements such as a wide angle, low sensitivity, good processability, compactness, and sufficient correction of aberrations, and has excellent imaging performance.

[0068] As can be understood, the image height of the 1.0 field of view refers to half the diagonal length of the sensor's effective pixel area, the image height of the MIC field of view refers to the field of view height that extends outward from the image height of the 1.0 field of view to prevent assembly variations, the FOV in the diagonal direction of the 1.0 field of view refers to the angle of view corresponding to the sensor's effective pixel area, and the FOV in the diagonal direction of the MIC field of view refers to the angle of view corresponding to the image height of the MIC field of view.

[0069] (Second embodiment) The meanings of the symbols in the second embodiment are the same as those in the first embodiment.

[0070] FIG. 5 shows an imaging optical lens 20 according to a second embodiment of the present invention.

[0071] Tables 3 and 4 show design data for the imaging optical lens 20 according to the second embodiment of the present invention.

[0072] [Table 3]

[0073] Table 4 shows the aspheric data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.

[0074] [Table 4]

[0075] 6 and 7 are schematic diagrams showing the axial chromatic aberration and chromatic aberration of magnification of light with wavelengths of 656 nm, 588 nm, 546 nm, 486 nm, and 436 nm, respectively, after passing through the imaging optical lens 20 according to the second embodiment. Fig. 8 is a schematic diagram showing the curvature of field and distortion of light with wavelength of 546 nm after passing through the imaging optical lens 20 according to the second embodiment. In Fig. 8, the curvature of field S is the curvature of field in the sagittal direction, and T is the curvature of field in the tangential direction.

[0076] In this embodiment, the entrance pupil diameter ENPD of the imaging optical lens 20 is 4.811 mm, the image height IH of the full field of view (1.0 field of view) is 8.000 mm, the angle of view FOV in the diagonal direction of the full field of view (1.0 field of view) is 84.55°, the image height IH of the MIC field of view is 8.150 mm, and the angle of view FOV in the diagonal direction of the MIC field of view is 85.83°, and the imaging optical lens 20 satisfies the design requirements of a wide angle, low sensitivity, good processability, compactness, and sufficient correction of aberrations, and has excellent imaging performance.

[0077] (Third embodiment) The meanings of the symbols in the third embodiment are the same as those in the first embodiment.

[0078] FIG. 9 shows an imaging optical lens 30 according to a third embodiment of the present invention.

[0079] Tables 5 and 6 show design data for the imaging optical lens 30 according to the third embodiment of the present invention.

[0080] [Table 5]

[0081] Table 6 shows the aspheric surface data of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.

[0082] [Table 6]

[0083] 10 and 11 are schematic diagrams showing the axial chromatic aberration and chromatic aberration of magnification of light with wavelengths of 656 nm, 588 nm, 546 nm, 486 nm, and 436 nm, respectively, after passing through the imaging optical lens 30 according to the third embodiment. Fig. 12 is a schematic diagram showing the curvature of field and distortion of light with wavelength of 546 nm after passing through the imaging optical lens 30 according to the third embodiment. In Fig. 12, the curvature of field S is the curvature of field in the sagittal direction, and T is the curvature of field in the tangential direction.

[0084] In this embodiment, the entrance pupil diameter ENPD of the imaging optical lens 30 is 4.844 mm, the image height IH of the full field of view (1.0 field of view) is 8.000 mm, the angle of view FOV in the diagonal direction of the full field of view (1.0 field of view) is 84.23°, the image height IH of the MIC field of view is 8.150 mm, and the angle of view FOV in the diagonal direction of the MIC field of view is 85.45°, and the imaging optical lens 30 satisfies the design requirements of a wide angle, low sensitivity, good processability, compactness, and sufficient correction of aberrations, and has excellent imaging performance.

[0085] (Fourth embodiment) The meanings of the symbols in the fourth embodiment are the same as those in the first embodiment.

[0086] FIG. 13 shows an imaging optical lens 40 according to a fourth embodiment of the present invention.

[0087] Tables 7 and 8 show design data for the imaging optical lens 40 according to the fourth embodiment of the present invention.

[0088] [Table 7]

[0089] Table 8 shows the aspheric surface data of each lens in the imaging optical lens 40 according to the fourth embodiment of the present invention.

[0090] [Table 8]

[0091] 14 and 15 are schematic diagrams showing the axial chromatic aberration and chromatic aberration of magnification of light having wavelengths of 656 nm, 588 nm, 546 nm, 486 nm, and 436 nm, respectively, after passing through the imaging optical lens 40 according to the fourth embodiment. Fig. 16 is a schematic diagram showing the curvature of field and distortion of light having a wavelength of 546 nm after passing through the imaging optical lens 40 according to the fourth embodiment. In Fig. 16, the curvature of field S is the curvature of field in the sagittal direction, and T is the curvature of field in the tangential direction.

[0092] In this embodiment, the entrance pupil diameter ENPD of the imaging optical lens 40 is 4.826 mm, the image height IH of the full field of view (1.0 field of view) is 8.000 mm, the angle of view FOV in the diagonal direction of the full field of view (1.0 field of view) is 84.58°, the image height IH of the MIC field of view is 8.150 mm, and the angle of view FOV in the diagonal direction of the MIC field of view is 85.93°, and the imaging optical lens 40 satisfies the design requirements of a wide angle, low sensitivity, good processability, compactness, and sufficient correction of aberrations, and has excellent imaging performance.

[0093] Table 9 shows various numerical values ​​and values ​​corresponding to parameters defined by conditional expressions in each of the first, second, third and fourth embodiments.

[0094] [Table 9]

[0095] As will be understood by those skilled in the art, the above-described embodiments are specific embodiments for realizing the present invention, and in actual applications, various changes in form and details are possible without departing from the spirit and scope of the present invention. [Explanation of symbols]

[0096] 10 Imaging optical lens 20 Imaging optical lens 30 Imaging optical lens 40 Imaging optical lens ENPD entrance pupil diameter FNO aperture value FOV angle GF Optical Filter IH image height L1 First lens L2 First lens L2 Second lens L3 Third lens L4 4th lens L5 Fifth lens L6 6th lens L7 7th lens S Field curvature Si image plane

Claims

1. An imaging optical lens, comprising: The imaging optical lens is composed of a total of seven lenses, The seven lenses are, in order from the object side to the image side, a first lens having positive refractive power, a second lens having negative refractive power, a third lens having negative 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 first lens has an object side surface that is a paraxial convex surface and an image side surface that is a paraxial concave surface, the second lens has an object side surface that is a paraxially convex surface and an image side surface that is a paraxially concave surface, the third lens has an object side surface that is a paraxially concave surface and an image side surface that is a paraxially concave surface, the fourth lens has an object side surface that is convex on a paraxial line and an image side surface that is convex on a paraxial line, the fifth lens has an object side surface that is a paraxial convex surface and an image side surface that is a paraxial concave surface, the sixth lens has an object side surface that is a paraxial convex surface and an image side surface that is a paraxial convex surface, the seventh lens has an object side surface that is a paraxial convex surface and an image side surface that is a paraxial concave surface, The focal length of the imaging optical lens is f, the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the focal length of the fifth lens is f5, the focal length of the seventh lens is f7, the central radius of curvature of the object side surface of the second lens in the paraxial direction is R3, the central radius of curvature of the image side surface of the second lens in the paraxial direction is R4, the central radius of curvature of the object side surface of the fifth lens in the paraxial direction is R9, the central radius of curvature of the image side surface of the fifth lens in the paraxial direction is R10, When the axial thickness is d9, the axial thickness of the seventh lens is d13, the radial height of the intersection between the chief ray of a 0.6x field of view of the imaging optical lens and the object side surface of the first lens is H0.6r1, the radial height of the intersection between the chief ray of a 0.6x field of view of the imaging optical lens and the object side surface of the fifth lens is H0.6r9, the radial height of the intersection between the chief ray of a 0.6x field of view of the imaging optical lens and the image side surface of the seventh lens is H0.6r14, the image height of a 1.0 field of view of the imaging optical lens is IH, and half of the angle of view of a 1.0 field of view of the imaging optical lens is semi-FOV, The following conditional expressions (1) to (7) are satisfied: An imaging optical lens characterized by: 5.00≦(f4-f5) / f1≦12.00 (1) 2.10≦(R3+R4) / f≦3.50 (2) 20.00≦(R9+R10) / d9≦40.00 (3) -9.00≦(f2-f3) / f≦-3.00 (4) 0.20≦H0.6r9 / IH≦0.30 (5) 16.00≦f1 / H0.6r1×tan (semi-FOV)≦30.00 (6) -6.00≦(H0.6r14 / d13)×(f7 / f)≦-3.00 (7)

2. The following condition (8) is satisfied:

2. The imaging optical lens according to claim 1. 2.10≦(R3+R4) / f≦2.90 (8)

3. The following condition (9) is satisfied:

2. The imaging optical lens according to claim 1. -7.70≦(f2-f3) / f≦-3.00 (9)

4. The following condition (10) is satisfied:

2. The imaging optical lens according to claim 1. 19.00≦f1 / H0.6r1×tan (semi-FOV)≦25.50 (10)

5. The following conditional expression (11) is satisfied:

2. The imaging optical lens according to claim 1. -5.30≦(H0.6r14 / d13)×(f7 / f)≦-3.70 (11)

6. When the focal length of the sixth lens is f6, The following conditional expression (12) is satisfied:

2. The imaging optical lens according to claim 1. −1.80≦f6 / f7≦−0.90 (12)

7. The following conditional expression (13) is satisfied:

7. The imaging optical lens according to claim 6. −1.55≦f6 / f7≦−1.10 (13)

8. The first lens is made of glass.

2. The imaging optical lens according to claim 1.

9. An imaging optical lens, comprising: The imaging optical lens is composed of a total of seven lenses, The seven lenses are, in order from the object side to the image side, a first lens having positive refractive power, a second lens having negative refractive power, a third lens having negative 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 first lens has an object side surface that is a paraxial convex surface and an image side surface that is a paraxial concave surface, the second lens has an object side surface that is a paraxially convex surface and an image side surface that is a paraxially concave surface, the third lens has an object side surface that is a paraxially concave surface and an image side surface that is a paraxially concave surface, the fourth lens has an object side surface that is convex on a paraxial line and an image side surface that is convex on a paraxial line, the fifth lens has an object side surface that is a paraxial convex surface and an image side surface that is a paraxial concave surface, the sixth lens has an object side surface that is a paraxial convex surface and an image side surface that is a paraxial convex surface, the seventh lens has an object side surface that is a paraxial convex surface and an image side surface that is a paraxial concave surface, The focal length of the imaging optical lens is f, the focal length of the first lens is f1, the focal length of the fifth lens is f5, the focal length of the seventh lens is f7, the central radius of curvature of the object side surface of the first lens in the paraxial direction is R1, the central radius of curvature of the image side surface of the first lens in the paraxial direction is R2, the central radius of curvature of the object side surface of the third lens in the paraxial direction is R5, the central radius of curvature of the image side surface of the third lens in the paraxial direction is R6, the axial distance from the image side surface of the second lens to the object side surface of the third lens is d4, the axial thickness of the third lens is d5, the axial distance from the image side surface of the third lens to the object side surface of the third lens is d6, When the axial distance to the object side surface of the lens is d6, the axial thickness of the seventh lens is d13, the radial height of the intersection point between the chief ray of a 0.6x field of view of the imaging optical lens and the object side surface of the first lens is H0.6r1, the radial height of the intersection point between the chief ray of a 0.6x field of view of the imaging optical lens and the object side surface of the fifth lens is H0.6r9, the radial height of the intersection point between the chief ray of a 0.6x field of view of the imaging optical lens and the image side surface of the seventh lens is H0.6r14, the image height of a 1.0 field of view of the imaging optical lens is IH, and half of the angle of view of a 1.0 field of view of the imaging optical lens is semi-FOV, The following conditional expressions (5) to (7) and (14) to (17) are satisfied: An imaging optical lens characterized by: 0.20≦H0.6r9 / IH≦0.30 (5) 16.00≦f1 / H0.6r1×tan (semi-FOV)≦30.00 (6) -6.00≦(H0.6r14 / d13)×(f7 / f)≦-3.00 (7) 0.21≦R1 / R2≦0.42 (14) 0.30≦d5 / (d4+d6)≦0.55 (15) −3.45≦R5 / R6≦−0.20 (16) −11.60≦f5 / f≦−3.00 (17)

10. The following conditional expression (18) is satisfied:

10. The imaging optical lens according to claim 9. 0.25≦R1 / R2≦0.35 (18)

11. The following condition (19) is satisfied:

10. The imaging optical lens according to claim 9. 0.35≦d5 / (d4+d6)≦0.45 (19)

12. The following conditional expression (20) is satisfied:

10. The imaging optical lens according to claim 9. −2.85≦R5 / R6≦−0.20 (20)

13. The following conditional expression (21) is satisfied:

10. The imaging optical lens according to claim 9. −10.00≦f5 / f≦−3.50 (21)

14. The following condition (10) is satisfied:

10. The imaging optical lens according to claim 9. 19.00≦f1 / H0.6r1×tan (semi-FOV)≦25.50 (10)

15. The following conditional expression (11) is satisfied:

10. The imaging optical lens according to claim 9. -5.30≦(H0.6r14 / d13)×(f7 / f)≦-3.70 (11)

16. The following conditional expression (22) is satisfied:

10. The imaging optical lens according to claim 9. 1.00≦f1 / f≦1.40 (22)

17. The following conditional expression (23) is satisfied:

17. The imaging optical lens according to claim 16. 1.05≦f1 / f≦1.25 (23)

18. When the axial thickness of the first lens is d1 and the optical length of the imaging optical lens is TTL, the following conditional expression (24) is satisfied:

10. The imaging optical lens according to claim 9. 0.09≦d1 / TTL≦0.16 (24)

19. The following conditional expression (25) is satisfied:

19. The imaging optical lens of claim 18. 0.10≦d1 / TTL≦0.14 (25)

20. The first lens is made of glass.

10. The imaging optical lens according to claim 9.

Images