Image capturing optical lens and lens assembly

Abstract

To provide an image capturing optical lens and a lens assembly.SOLUTION: An image capturing optical lens disclosed herein comprises seven lenses in total, 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 given conditional expressions regarding distortion of the image capturing optical lens in a field of view at each magnification, a focal length, optical constant, radius of curvature of each lens, an entrance pupil diameter of the image capturing optical lens, an angle of view at 1.0x field of view of the image capturing optical lens, etc.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to the field of optical lenses, and more particularly to imaging optical lenses and lens assemblies that are 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 development of various smart devices, the demand for miniaturized imaging optical lenses has been increasing. In addition to the shrinking pixel size of photosensitive elements, current electronic products are trending toward high functionality and lightweight, thin, and portable designs. Therefore, miniaturized imaging optical lenses with good imaging quality have become mainstream in the current market. To achieve good imaging quality, multi-lens structures are 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 growing demand for wide-angle imaging lenses and lens assemblies with excellent optical properties, easy processability, and sufficient aberration correction. Summary of the Invention [Problem to be solved by the invention]

[0003] In view of the above problems, the present invention aims to provide an imaging optical lens that has good optical performance, small aberration, high image quality, easy processing, and convenient design requirements for adjusting image distortion later. [Means for solving the problem]

[0004] In order to achieve the above object, a technical 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 convex 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 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 concave 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, DIST is the distortion of the imaging optical lens at a 1.0x field of view. 1.0H Distortion at 0.8x field of view 0.8H Distortion at 0.6x field of view 0.6H Distortion at 0.5x field of view 0.5H Distortion at 0.3x field of view 0.3H a composite focal length of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens is f2345, a composite focal length of the sixth lens and the seventh lens is f67, a central radius of curvature of the object side surface of the seventh lens at the paraxial line is R13, a central radius of curvature of the image side surface of the seventh lens at the paraxial line is R14, an Abbe number of the first lens is v1, a central radius of curvature of the object side surface of the third lens at the paraxial line is R5, a central radius of curvature of the image side surface of the third lens at the paraxial line is R6, a focal length of the imaging optical lens is f, an entrance pupil diameter of the imaging optical lens is ENPD, an angle of view of the imaging optical lens at a 1.0x field of view is FOV, and the following relational expressions (1) to (7) are satisfied. 0.40≦(DIST 0.8H -DIST0.5H ) / (DIST 0.5H -DIST 0.3H )≦1.60 (1) -0.13≦(DIST 1.0H -DIST 0.8H ) / (DIST 0.8H -DIST 0.6H )≦2.50 (2) 0.25≦f12345 / f67≦2.40 (3) 1.60≦R13 / R14≦3.80 (4) 80.00≦v1≦82.00 (5) 4.00≦(R5+R6) / f≦9.00 (6) 0.05≦ENPD / FOV≦0.07 (7)

[0005] Preferably, the following relational expression (8) is satisfied. 0.40≦(DIST 0.8H -DIST 0.5H ) / (DIST 0.5H -DIST 0.3H )≦1.40 (8)

[0006] Preferably, the following relational expression (9) is satisfied. -0.12≦(DIST 1.0H -DIST 0.8H ) / (DIST 0.8H -DIST 0.6H )≦2.10 (9)

[0007] Preferably, the following relational expression (10) is satisfied. 0.25≦f12345 / f67≦2.10 (10)

[0008] Preferably, the following relational expression (11) is satisfied. 2.00≦R13 / R14≦3.20 (11)

[0009] Preferably, the following relational expression (12) is satisfied. 5.00≦(R5+R6) / f≦7.80 (12)

[0010] Preferably, the maximum optical radius of the object side surface of the third lens is SD31, the arrow height at the maximum optical radius of the object side surface of the third lens is SAG31, the maximum optical radius of the object side surface of the first lens is SD11, the arrow height at the maximum optical radius of the object side surface of the first lens is SAG11, the central radius of curvature at the paraxial surface of the object side surface of the first lens is R1, and the central radius of curvature at the paraxial surface of the object side surface of the third lens is R5, and the following relational expression (13) is satisfied: -6.60≦(SAG31 / SD31*R5) / (SAG11 / SD11*R1)≦-1.40(13)

[0011] Preferably, the following relational expression (14) is satisfied. -5.80≦(SAG31 / SD31*R5) / (SAG11 / SD11*R1)≦-1.70 (14)

[0012] Preferably, the axial thickness of the first lens is d1, the axial thickness of the second lens is d3, and the axial thickness of the seventh lens is d13, and the following relational expression (15) is satisfied. 1.45≦(d1+d3+d13) / d1≦2.25 (15)

[0013] Preferably, the following relational expression (16) is satisfied. 1.63≦(d1+d3+d13) / d1≦2.02 (16)

[0014] Preferably, the first lens is made of glass.

[0015] The technical 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 convex 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 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 concave 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, DIST is the distortion of the imaging optical lens at a 1.0x field of view. 1.0H Distortion at 0.8x field of view 0.8H Distortion at 0.6x field of view 0.6H Distortion at 0.5x field of view 0.5H Distortion at 0.3x field of view 0.3H a composite focal length of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens is f12345, a composite focal length of the sixth lens and the seventh lens is f67, 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 second lens in the paraxial direction is R3, a central radius of curvature of the image side surface of the second lens in the paraxial direction is R4, a central radius of curvature of the object side surface of the sixth lens in the paraxial direction is R11, and a central radius of curvature of the image side surface of the sixth lens in the paraxial direction is R12, and the following relational expressions (1) to (3) and relational expressions (17) to (19) are satisfied. 0.40≦(DIST 0.8H -DIST 0.5H ) / (DIST 0.5H -DIST 0.3H )≦1.60 (1) -0.13≦(DIST 1.0H -DIST 0.8H ) / (DIST 0.8H -DIST 0.6H )≦2.50 (2) 0.25≦f12345 / f67≦2.40 (3) -2.50≦(R1+R2) / (R1-R2)≦-1.50 (17) 7.00≦(R3+R4) / (R3-R4)≦10.00 (18) 0.30≦R11 / R12≦0.40 (19)

[0016] Preferably, the following relational expression (8) is satisfied. 0.40≦(DIST 0.8H -DIST 0.5H ) / (DIST 0.5H -DIST 0.3H )≦1.40 (8)

[0017] Preferably, the following relational expression (9) is satisfied. -0.12≦(DIST 1.0H -DIST 0.8H ) / (DIST 0.8H -DIST 0.6H )≦2.10 (9)

[0018] Preferably, the following relational expression (10) is satisfied. 0.25≦f12345 / f67≦2.10 (10)

[0019] Preferably, the following relational expression (20) is satisfied. -2.10≦(R1+R2) / (R1-R2)≦-1.90 (20)

[0020] Preferably, the following relational expression (21) is satisfied. 7.80≦(R3+R4) / (R3-R4)≦9.20 (21)

[0021] Preferably, the sum of the lengths on the optical axis of the air gaps between any two adjacent lenses among the first lens to the seventh lens is Σd, the total optical length of the imaging optical lens is TTL, and the following relational expression (22) is satisfied: 0.25≦Σd / TTL≦0.37 (22)

[0022] Preferably, the following relational expression (23) is satisfied. 0.28≦Σd / TTL≦0.33 (23)

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

[0024] The technical solution of the present invention further provides a lens assembly including the above-mentioned imaging optical lens, specifically, the lens assembly includes a first lens barrel accommodating the first lens and a second lens barrel accommodating the second to seventh lenses.

[0025] Preferably, the first lens barrel includes a first top surface close to the object side, the second lens barrel includes a second top surface close to the object side, the object side surface of the first lens protrudes from the first top surface towards the object side portion, the distance along the optical axis between the first top surface and the center of the object side surface of the first lens is B1, the distance along the optical axis between the second top surface and the center of the object side surface of the first lens is B2, the central radius of curvature of the object side surface of the first lens in the paraxial direction is R1, and the focal length of the first lens is f1, and the following relational expression (24) is satisfied: 0.80≦(B1 / B2)*(f1 / R1)≦1.50 (24) [Effects of the Invention]

[0026] The beneficial effects of the present invention are as follows: The imaging optical lens of the present invention has excellent optical properties, low aberration, high image quality, good processability, and convenient adjustment of image distortion in the later stages. It is particularly applicable to imaging lens assemblies for mobile phones, web imaging lenses, and vehicle-mounted lenses, which are configured with imaging elements such as high-pixel CCDs and CMOSs. [Brief explanation of the drawings]

[0027] [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] 2 is a schematic diagram showing on-axis 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 field curvature and distortion of the imaging optical lens shown in FIG. 1. [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] 6 is a schematic diagram showing on-axis aberration of the imaging optical lens shown in FIG. 5. [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 field curvature 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] 10 is a schematic diagram showing on-axis 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] 10 is a schematic diagram showing the field curvature 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] 14 is a schematic diagram showing on-axis aberration of the imaging optical lens shown in FIG. 13. [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 field curvature and distortion of the imaging optical lens shown in FIG. 13. [Figure 17] 1 is a schematic diagram showing a configuration of a lens assembly according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0028] 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 above 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. In order to make the objectives, technical 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 drawings. However, it will be 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, the technical solutions to be protected by the present invention can be realized without these technical details and various changes and modifications based on the following embodiments.

[0029] 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 lenses include, in order from the object side to the image side, a diaphragm S1, 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.

[0030] 17, the technical solution of the present invention further provides a lens assembly 100 including a lens barrel 110 and any one of the above-mentioned imaging optical lenses housed in the lens barrel 110. The lens barrel 110 includes a first lens barrel 101 and a second lens barrel 102. The first lens barrel 101 and the second lens barrel 102 may be integrally molded or separately molded. Specifically, the first lens barrel 101 houses the first lens L1, and the second lens barrel 102 houses the second lens L2 to the seventh lens L7. The first lens barrel 101 includes a first top surface 1011 close to the object side, the second lens barrel 102 includes a second top surface 1021 close to the object side, the object side surface of the first lens L1 protrudes from the first top surface 1011 towards the object side portion, and when a distance along the optical axis X between the first top surface 1011 and a center L1X of the object side surface of the first lens L1 is B1, a distance along the optical axis X between the second top surface 1021 and the center L1X of the object side surface of the first lens L1 is B2, a central radius of curvature in the paraxial direction of the object side surface of the first lens L1 is R1, and a focal length of the first lens L1 is f1, the relationship 0.80≦(B1 / B2)*(f1 / R1)≦1.50 is satisfied.

[0031] 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 serves to reduce chromatic aberration and improve the performance of the optical imaging lens. Each lens may also be made of other materials.

[0032] 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.

[0033] The first lens L1 has a paraxially convex object side surface and a paraxially concave image side surface, and has positive refractive power. The object side and image side surfaces of the first lens L1 may be arranged in other concave / convex distributions.

[0034] The second lens L2 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 second lens L2 may be arranged in other concave / convex distributions.

[0035] The third lens L3 has a paraxially convex object side surface and a paraxially convex image side surface, and the third lens L3 has negative refractive power. The object side and image side surfaces of the third lens L3 may be arranged in other concave / convex distributions.

[0036] 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.

[0037] The fifth lens L5 has a paraxially convex or 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 fifth lens L5 may be arranged in other concave / convex distributions.

[0038] The sixth lens L6 has a paraxially convex object side surface and a paraxially concave 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.

[0039] 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.

[0040] DIST is the distortion of the imaging optical lens at a 0.8x field of view. 0.8H Distortion at 0.5x field of view 0.5H Distortion at 0.3x field of view 0.3H If we define it as 0.40≦(DIST 0.8H-DIST 0.5H ) / (DIST 0.5H -DIST 0.3H )≦1.60. Within the range of this relationship, it is advantageous to optimize the distortion curve, and in later image processing, it is easy to match with the distortion correction formula, improve the distortion correction effect, and reduce image distortion, where Distortion=(Actual Image Height-Ideal Image Height) / Ideal Image Height*100%. Preferably, 0.40≦(DIST 0.8H -DIST 0.5H ) / (DIST 0.5H -DIST 0.3H )≦1.40.

[0041] DIST is the distortion of the imaging optical lens at a 1.0x field of view. 1.0H Distortion at 0.8x field of view 0.8H Distortion at 0.6x field of view 0.6H If we define it as -0.13≦(DIST 1.0H -DIST 0.8H ) / (DIST 0.8H -DIST 0.6H )≦2.50. Within the range of this relationship, it is advantageous to optimize the distortion curve, and in the later image processing, it is easy to match with the distortion correction formula, improve the distortion correction effect, and reduce the image distortion. Preferably, -0.12≦(DIST 1.0H -DIST 0.8H ) / (DIST 0.8H -DIST 0.6H )≦2.10.

[0042] If the composite focal length of the first, second, third, fourth, and fifth lenses is defined as f12345, and the composite focal length of the sixth and seventh lenses is defined as f67, then the following relationship is satisfied: 0.25≦f12345 / f67≦2.40. By appropriately setting the proportional relationship between the composite focal lengths of the sixth and seventh lenses and the composite focal lengths of the first, second, third, fourth, and fifth lenses within the range of this relationship, it is possible to rationally distribute the refractive power of each lens in space and reduce aberrations in the optical system. Preferably, 0.25≦f12345 / f67≦2.10.

[0043] If the paraxial central radius of curvature of the object-side surface of the seventh lens is defined as R13 and the paraxial central radius of curvature of the image-side surface of the seventh lens is defined as R14, the relationship 1.60≦R13 / R14≦3.80 is satisfied. By controlling the ratio of the paraxial central radius of curvature of the object-side surface of the seventh lens to the paraxial central radius of curvature of the image-side surface of the seventh lens within this range, the workability of the seventh lens can be ensured, system aberrations can be reduced, and image quality can be improved. Preferably, the ratio 2.00≦R13 / R14≦3.20.

[0044] If the Abbe number of the first lens is defined as v1, the relationship 80.00≦v1≦82.00 is satisfied. By controlling the Abbe number of the first lens within this range, the goal of controlling chromatic aberration in the entire system can be achieved. By using such a low refractive index, high Abbe number material in the design, the characteristics of the material can be utilized to achieve better performance of the imaging lens, thereby better meeting market demands.

[0045] If the central radius of curvature of the object-side surface of the third lens at the paraxial direction is defined as R5, the central radius of curvature of the image-side surface of the third lens at the paraxial direction is defined as R6, and the focal length of the imaging optical lens is defined as f, the following relationship is satisfied: 4.00≦(R5+R6) / f≦9.00. By appropriately setting the ratio between the sum of the central radii of curvature of the object-side and image-side surfaces of the third lens and the effective focal length of the imaging optical lens, the optical imaging lens can have sufficiently small chromatic aberration of magnification, ensuring that the optical imaging lens is less likely to produce phenomena such as purple fringing and yellow borders during photography. Preferably, the relationship is 5.00≦(R5+R6) / f≦7.80.

[0046] If the entrance pupil diameter of the imaging optical lens is defined as ENPD and the angle of view of the imaging optical lens at a 1.0x field of view is defined as FOV, the relationship 0.05≦ENPD / FOV≦0.07 is satisfied. By limiting the ratio of ENPD to FOV within a reasonable range, a small FNO lens can be realized, and the demand for a wide angle can be met while increasing the amount of incident light.

[0047] If SD31 is the maximum optical radius of the object-side surface of the third lens, SAG31 is the arrow height at the maximum optical radius of the object-side surface of the third lens, SD11 is the maximum optical radius of the object-side surface of the first lens, SAG11 is the arrow height at the maximum optical radius of the object-side surface of the first lens, R1 is the central radius of curvature of the object-side surface of the first lens in the paraxial direction, and R5 is the central radius of curvature of the object-side surface of the third lens in the paraxial direction, the following relationship is satisfied: -6.60≦(SAG31 / SD31*R5) / (SAG11 / SD11*R1)≦-1.40. Within the range of this relationship, both the object-side surfaces of the first lens and the third lens have gentle surface shapes, which reduces the assembly sensitivity of the imaging optical lens. Preferably, -5.80≦(SAG31 / SD31*R5) / (SAG11 / SD11*R1)≦-1.70. Here, the maximum optical radius refers to the maximum radius that the MIC field ray reaches on the lens surface, and the arrow height refers to the distance along the optical axis from a point on the surface to the surface center point on the optical axis, with the right side of the center point being positive and the left side of the center point being negative.

[0048] If the axial thickness of the first lens is defined as d1, the axial thickness of the second lens as d3, and the axial thickness of the seventh lens as d13, the following relational expression is satisfied: 1.45≦(d1+d3+d13) / d1≦2.25. Rational control of the axial thicknesses of the first lens, second lens, and seventh lens is advantageous for achieving ultra-thin lenses. Preferably, the relation is 1.63≦(d1+d3+d13) / d1≦2.02.

[0049] If the central radius of curvature of the object-side surface of the first lens in the paraxial direction is defined as R1 and the central radius of curvature of the image-side surface of the first lens in the paraxial direction is defined as R2, the relationship satisfies -2.50≦(R1+R2) / (R1-R2)≦-1.50. By rationally controlling the shape of the first lens, the surface precision and refractive power of the first lens can be adjusted, contributing to receiving light rays with a larger angle of view. Preferably, the relationship satisfies -2.10≦(R1+R2) / (R1-R2)≦-1.90.

[0050] If the central radius of curvature of the object-side surface of the second lens at the paraxial direction is defined as R3 and the central radius of curvature of the image-side surface of the second lens at the paraxial direction is defined as R4, the relationship 7.00≦(R3+R4) / (R3-R4)≦10.00 is satisfied. This ensures the processability of the shape of the second lens and enables the mobile imaging module to effectively control aberrations generated by the second lens. Preferably, 7.80≦(R3+R4) / (R3-R4)≦9.20.

[0051] When the sum of the air gaps on the optical axis between any two adjacent lenses among the first lens to the seventh lens is Σd and the total optical length of the imaging optical lens is TTL, the following relational expression is satisfied: 0.25≦Σd / TTL≦0.37. By rationally controlling the ratio of the sum of the air gaps on the optical axis between each two adjacent lenses to the total optical length within the range of this relational expression, an extremely thin lens can be achieved. Preferably, the ratio is 0.28≦Σd / TTL≦0.33.

[0052] Compared with the prior art, the imaging optical lens of the present invention has a 0.8H -DIST 0.5H ) / (DIST 0.5H -DIST 0.3H )≦1.60, -0.13≦(DIST 1.0H -DIST 0.8H ) / (DIST 0.8H -DIST 0.6H)≦2.50, 0.25≦f12345 / f67≦2.40, 1.60≦R13 / R14≦3.80, 80.00≦v1≦82.00, 4.00≦(R5+R6) / f≦9.00, 0.05≦ENPD / FOV≦0.07. This optimizes the distortion curve, making it easier to match the distortion correction formula in post-processing, improving the distortion correction effect and reducing image distortion. This is beneficial for the rational spatial distribution of the refractive power of each lens, reducing the aberrations of the optical system, ensuring the ease of processing the seventh lens, reducing the aberrations of the system, and improving image quality. It also controls the overall chromatic aberration of the system and utilizes the properties of materials to achieve better performance of the imaging lens. This ensures that the optical imaging lens has sufficiently small chromatic aberration of magnification, and ensures that the optical imaging lens is less likely to produce phenomena such as purple fringing and yellow borders during shooting. It is possible to realize a small FNO lens, increase the amount of incident light, and meet the demand for a wider angle.

[0053] Furthermore, compared to the prior art, the present invention has a 0.8H -DIST 0.5H ) / (DIST 0.5H -DIST 0.3H )≦1.60, -0.13≦(DIST 1.0H -DIST 0.8H ) / (DIST 0.8H -DIST 0.6H)≦2.50, 0.25≦f12345 / f67≦2.40, -2.50≦(R1+R2) / (R1-R2)≦-1.50, 7.00≦(R3+R4) / (R3-R4)≦10.00, 0.30≦R11 / R12≦0.40. This optimizes the distortion curve, making it easier to match the distortion correction formula in post-processing. This is beneficial for improving the distortion correction effect and reducing image distortion. It is also beneficial for rationally distributing the refractive power of each lens in space, reducing the aberrations of the optical system, ensuring the ease of processing the seventh lens, reducing the aberrations of the system, and improving image quality. It is also beneficial for receiving light with a larger angle of view. The processability of the shape of the second lens can be ensured, and the moving imaging module can effectively control the aberration generated by the second lens. The surface precision of the sixth lens can correct off-axis aberrations in combination with the fifth lens, while simultaneously preventing stray light from occurring at the image side edge, thereby improving the illumination intensity and imaging quality of the imaging plane.

[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 is the total optical length (the axial distance from the object side of the first lens L1 to the image plane Si) and is expressed in mm.

[0056] The aperture value FNO is the ratio of the effective focal length of the 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 meanings of the symbols are 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 v5: 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 of the first embodiment according to the present invention.

[0062] [Table 2]

[0063] For convenience, the aspherical surface of each lens surface is expressed by the following formula (1): However, the present invention is not particularly limited to the aspherical polynomial of formula (1).

[0064]

number

[0065] Here, 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 a distance r from the optical axis and a tangent plane that is tangent to the vertex of the aspheric surface on the optical axis).

[0066] 2 and 3 are schematic diagrams showing the axial aberration and chromatic aberration of magnification of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm, respectively, after passing through the imaging optical lens 10 according to the first embodiment. Fig. 4 is a schematic diagram showing the field curvature and distortion of light with wavelength of 555 nm after passing through the imaging optical lens 10 according to the first embodiment, where the field curvature S in Fig. 4 is the field curvature in the sagittal direction and T is the field curvature in the tangential direction.

[0067] In this embodiment, the entrance pupil diameter ENPD of the imaging optical lens 10 is 5.136 mm, the image height IH of the full field of view (1.0x field of view) is 8.000 mm, the diagonal field of view FOV of the full field of view (1.0x field of view) is 85.58°, the image height IH of the MIC field of view is 8.250 mm, and the diagonal field of view FOV of the MIC field of view is 87.71°. The imaging optical lens 10 has few aberrations, satisfies the design requirements of high image quality, easy processing, and convenient adjustment of late-stage image distortion, and its on-axis and off-axis chromatic aberrations are sufficiently corrected, and it has excellent optical properties.

[0068] As can be understood, the image height at a 1.0x 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 beyond the image height at a 1.0x field of view to prevent assembly misalignment, the diagonal FOV at a 1.0x field of view refers to the field angle corresponding to the sensor's effective pixel area, and the diagonal FOV of the MIC field of view refers to the field angle 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 aberration and chromatic aberration of magnification of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm, respectively, after passing through the imaging optical lens 20 according to the second embodiment. Fig. 8 is a schematic diagram showing the field curvature and distortion of light with a wavelength of 555 nm after passing through the imaging optical lens 20 according to the second embodiment. In Fig. 8, the field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the tangential direction.

[0076] In this embodiment, the entrance pupil diameter ENPD of the imaging optical lens 20 is 5.077 mm, the image height IH of the full field of view (1.0x field of view) is 8.000 mm, the diagonal field of view FOV of the full field of view (1.0x field of view) is 83.00°, the image height IH of the MIC field of view is 8.290 mm, and the diagonal field of view FOV of the MIC field of view is 84.97°. The imaging optical lens 20 has small aberrations, meets the design requirements of high image quality, ease of processing, and convenient adjustment of late-stage image distortion, and its on-axis and off-axis chromatic aberrations are sufficiently corrected, and has excellent optical properties.

[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 aberration and chromatic aberration of magnification of light with wavelengths of 655 nm, 610 nm, 555 nm, 510 nm, 470 nm, and 435 nm, respectively, after passing through the imaging optical lens 30 according to the third embodiment. Fig. 12 is a schematic diagram showing the field curvature and distortion of light with a wavelength of 555 nm after passing through the imaging optical lens 30 according to the third embodiment. In Fig. 12, the field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the tangential direction.

[0084] In this embodiment, the entrance pupil diameter ENPD of the imaging optical lens 30 is 5.140 mm, the image height IH of the full field of view (1.0x field of view) is 8.000 mm, the diagonal field of view FOV of the full field of view (1.0x field of view) is 85.10°, the image height IH of the MIC field of view is 8.290 mm, and the diagonal field of view FOV of the MIC field of view is 87.14°. The imaging optical lens 30 has small aberrations, meets the design requirements of high image quality, ease of processing, and convenient adjustment of late-stage image distortion, and its on-axis and off-axis chromatic aberrations are sufficiently corrected, and has excellent optical properties.

[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 aberration and chromatic aberration of magnification of light with wavelengths of 655 nm, 610 nm, 555 nm, 510 nm, 470 nm, and 435 nm, respectively, after passing through the imaging optical lens 40 according to the fourth embodiment. Fig. 16 is a schematic diagram showing the field curvature and distortion of light with a wavelength of 555 nm after passing through the imaging optical lens 40 according to the fourth embodiment. The field curvature S in Fig. 16 is the field curvature in the sagittal direction, and T is the field curvature in the tangential direction.

[0092] In this embodiment, the entrance pupil diameter ENPD of the imaging optical lens 40 is 5.069 mm, the image height IH of the full field of view (1.0x field of view) is 8.000 mm, the diagonal field of view FOV of the full field of view (1.0x field of view) is 85.79°, the image height IH of the MIC field of view is 8.290 mm, and the diagonal field of view FOV of the MIC field of view is 87.91°. The imaging optical lens 40 has small aberrations, meets the design requirements of high image quality, ease of processing, and convenient adjustment of late-stage image distortion, and its on-axis and off-axis chromatic aberrations are sufficiently corrected, and has excellent optical properties.

[0093] [Table 9]

[0094] 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.

Claims

1. An imaging optical lens, comprising: the imaging optical lens is configured by a total of seven lenses, and 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 convex on the paraxial line and an image side surface that is concave on the paraxial line, the second lens has an object side surface that is convex on the paraxial line and an image side surface that is concave on the paraxial line, the third lens has an object side surface that is convex on the paraxial line and an image side surface that is concave on the paraxial line, the fourth lens has an object side surface that is convex on the paraxial line and an image side surface that is convex on the paraxial line, the fifth lens has an image side surface that is concave on the paraxial line, the sixth lens has an object side surface that is convex on the paraxial line and an image side surface that is concave on the paraxial line, and the seventh lens has an object side surface that is convex on the paraxial line and an image side surface that is concave on the paraxial line, The distortion of the imaging optical lens at a 1.0x field of view is defined as DIST １．０Ｈ , the distortion of the imaging optical lens at a 0.8x field of view is DIST ０．８Ｈ , the distortion of the imaging optical lens at a 0.6x field of view is DIST ０．６Ｈ , the distortion of the imaging optical lens at a 0.5x field of view is DIST ０．５Ｈ , the distortion of the imaging optical lens at a 0.3x field of view is DIST ０．３Ｈ an image-side surface of the seventh lens is R14; an Abbe number of the first lens is v1; an image-side surface of the third lens is R5; an image-side surface of the third lens is R6; an image-side surface of the third lens is R7; an image-side surface of the third lens is R8; an image-side surface of the imaging optical lens is R9; an image-side surface of the imaging optical lens is R10; an image-side surface of the imaging optical lens is R11; an image-side surface of the imaging optical lens is R12; an image-side surface of the imaging optical lens is R13; an image-side surface of the imaging optical lens is R14; an image-side surface of the imaging optical lens is R15; an image-side surface of the imaging optical lens is R16; an image-side surface of the imaging optical lens is R17; an image-side surface of the imaging optical lens is R18; an image-side surface of the imaging optical lens is R19; an image-side surface of the imaging optical lens is R20; an image-side surface of the imaging optical lens is R21; an image-side surface of the imaging optical lens is R22; an image-side surface of the imaging optical lens is R23; an image-side surface of the imaging optical lens is R24; an image-side surface of the imaging optical lens is R25; an image-side surface of the imaging optical lens is R26; an image-side surface of the imaging optical lens is R27; 0.40≦(DIST ０．８Ｈ -DIST ０．５Ｈ ) / (DIST ０．５Ｈ -DIST ０．３Ｈ )≦1.60 (1) -0.13≦(DIST １．０Ｈ -DIST ０．８Ｈ ) / (DIST ０．８Ｈ -DIST ０．６Ｈ )≦2.50 (2) 0.25≦f12345 / f67≦2.40 (3) 1.60≦R13 / R14≦3.80 (4) 80.00≦v1≦82.00 (5) 4.00≦(R5+R6) / f≦9.00 (6) 0.05≦ENPD / FOV≦0.07 (7)

2. 2. The imaging optical lens according to claim 1, wherein the following relational expression (8) is satisfied: 0.40≦(DIST ０．８Ｈ -DIST ０．５Ｈ ) / (DIST ０．５Ｈ -DIST ０．３Ｈ )≦1.40 (8)

3. 2. The imaging optical lens according to claim 1, wherein the following relational expression (9) is satisfied: -0.12≦(DIST １．０Ｈ -DIST ０．８Ｈ ) / (DIST ０．８Ｈ -DIST ０．６Ｈ )≦2.10 (9)

4. 2. The imaging optical lens according to claim 1, wherein the following relational expression (10) is satisfied: 0.25≦f12345 / f67≦2.10 (10)

5. 2. The imaging optical lens according to claim 1, wherein the following relational expression (11) is satisfied: 2.00≦R13 / R14≦3.20 (11)

6. 2. The imaging optical lens according to claim 1, wherein the following relational expression (12) is satisfied: 5.00≦(R5+R6) / f≦7.80 (12)

7. 2. The imaging optical lens according to claim 1, wherein a maximum optical radius of the object-side surface of the third lens is SD31, a arrow height at the maximum optical radius of the object-side surface of the third lens is SAG31, a maximum optical radius of the object-side surface of the first lens is SD11, a arrow height at the maximum optical radius of the object-side surface of the first lens is SAG11, a central radius of curvature at the paraxial surface of the object-side surface of the first lens is R1, and a central radius of curvature at the paraxial surface of the object-side surface of the third lens is R5, and the following relational expression (13) is satisfied: -6.60≦(SAG31 / SD31*R5) / (SAG11 / SD11*R1)≦-1.40(13)

8. 8. The imaging optical lens according to claim 7, wherein the following relational expression (14) is satisfied: -5.80≦(SAG31 / SD31*R5) / (SAG11 / SD11*R1)≦-1.70 (14)

9. 2. The imaging optical lens according to claim 1, wherein an axial thickness of the first lens is d1, an axial thickness of the second lens is d3, and an axial thickness of the seventh lens is d13, and the following relational expression (15) is satisfied: 1.45≦(d1+d3+d13) / d1≦2.25 (15)

10. The imaging optical lens according to claim 9, wherein the following relational expression (16) is satisfied: 1.63≦(d1+d3+d13) / d1≦2.02 (16)

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

12. An imaging optical lens, comprising: the imaging optical lens is configured by a total of seven lenses, and 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 convex on the paraxial line and an image side surface that is concave on the paraxial line, the second lens has an object side surface that is convex on the paraxial line and an image side surface that is concave on the paraxial line, the third lens has an object side surface that is convex on the paraxial line and an image side surface that is concave on the paraxial line, the fourth lens has an object side surface that is convex on the paraxial line and an image side surface that is convex on the paraxial line, the fifth lens has an image side surface that is concave on the paraxial line, the sixth lens has an object side surface that is convex on the paraxial line and an image side surface that is concave on the paraxial line, and the seventh lens has an object side surface that is convex on the paraxial line and an image side surface that is concave on the paraxial line, The distortion of the imaging optical lens at a 1.0x field of view is defined as DIST １．０Ｈ , the distortion of the imaging optical lens at a 0.8x field of view is DIST ０．８Ｈ , the distortion of the imaging optical lens at a 0.6x field of view is DIST ０．６Ｈ , the distortion of the imaging optical lens at a 0.5x field of view is DIST ０．５Ｈ , the distortion of the imaging optical lens at a 0.3x field of view is DIST ０．３Ｈ a composite focal length of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens is f12345, a composite focal length of the sixth lens and the seventh lens is f67, 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 second lens in the paraxial direction is R3, a central radius of curvature of the image-side surface of the second lens in the paraxial direction is R4, a central radius of curvature of the object-side surface of the sixth lens in the paraxial direction is R11, and a central radius of curvature of the image-side surface of the sixth lens in the paraxial direction is R12, and the following relational expressions (1) to (3) and (17) to (19) are satisfied. 0.40≦(DIST ０．８Ｈ -DIST ０．５Ｈ ) / (DIST ０．５Ｈ -DIST ０．３Ｈ )≦1.60 (1) -0.13≦(DIST １．０Ｈ -DIST ０．８Ｈ ) / (DIST ０．８Ｈ -DIST ０．６Ｈ )≦2.50 (2) 0.25≦f12345 / f67≦2.40 (3) -2.50≦(R1+R2) / (R1-R2)≦-1.50 (17) 7.00≦(R3+R4) / (R3-R4)≦10.00 (18) 0.30≦R11 / R12≦0.40 (19)

13. 13. The imaging optical lens according to claim 12, wherein the following relational expression (8) is satisfied: 0.40≦(DIST ０．８Ｈ -DIST ０．５Ｈ ) / (DIST ０．５Ｈ -DIST ０．３Ｈ )≦1.40 (8)

14. 13. The imaging optical lens according to claim 12, wherein the following relational expression (9) is satisfied: -0.12≦(DIST １．０Ｈ -DIST ０．８Ｈ ) / (DIST ０．８Ｈ -DIST ０．６Ｈ )≦2.10 (9)

15. 13. The imaging optical lens according to claim 12, wherein the following relational expression (10) is satisfied: 0.25≦f12345 / f67≦2.10 (10)

16. 13. The imaging optical lens according to claim 12, wherein the following relational expression (20) is satisfied: -2.10≦(R1+R2) / (R1-R2)≦-1.90 (20)

17. 13. The imaging optical lens according to claim 12, wherein the following relational expression (21) is satisfied: 7.80≦(R3+R4) / (R3-R4)≦9.20 (21)

18. 13. The imaging optical lens according to claim 12, wherein a sum of lengths on the optical axis of air gaps between any two adjacent lenses among the first lens to the seventh lens is Σd, a total optical length of the imaging optical lens is TTL, and the following relational expression (22) is satisfied: 0.25≦Σd / TTL≦0.37 (22)

19. 19. The imaging optical lens according to claim 18, wherein the following relational expression (23) is satisfied: 0.28≦Σd / TTL≦0.33 (23)

20. The imaging optical lens according to claim 12, wherein the first lens is made of glass.

21. 1. A lens assembly comprising: The lens assembly comprises an imaging optical lens according to any one of claims 1 to 20; The lens assembly includes a first lens barrel that houses the first lens, and a second lens barrel that houses the second to seventh lenses.

22. 22. The lens assembly according to claim 21, wherein the first lens barrel includes a first top surface close to the object side, the second lens barrel includes a second top surface close to the object side, the object-side surface of the first lens protrudes from the first top surface toward the object-side portion, a distance along the optical axis between the first top surface and the center of the object-side surface of the first lens is B1, a distance along the optical axis between the second top surface and the center of the object-side surface of the first lens is B2, a central radius of curvature in a paraxial direction of the object-side surface of the first lens is R1, a focal length of the first lens is f1, and the following relationship (24) is satisfied: 0.80≦(B1 / B2)*(f1 / R1)≦1.50 (24)

Images