Imaging Optical Lens

Abstract

The present invention relates to the field of optical lenses, and provides an imaging optical lens. The imaging optical lens is configured by 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, and the seven lenses satisfy a conditional formula 0.90≦d1 1.5 / d13 1.5 ≦1.70, 1.00≦(d3 1.5 +d5 1.5 +d7 1.5 ) / (d9 1.5 +d11 1.5 )≦1.80, 1.10≦d13 1.5 / d13≦2.00 is satisfied.

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 vehicle-mounted lenses. [Background technology]

[0002] In recent years, with the rise of various smart devices, the demand for miniaturized imaging optical lenses is increasing, and the pixel size of the photosensitive element is reduced, and the current electronic products tend to develop with good functions and a light, thin, and portable appearance, so that miniaturized imaging optical lenses with good imaging quality are the mainstream in the current market. In order to obtain good imaging quality, a multi-lens structure is often adopted. In addition, with the development of technology and the increasing diversification needs of users, the pixel area of ​​the photosensitive element is shrinking, and the system requirements for imaging quality are increasing, so that a seven-lens structure is gradually appearing in the lens design. There is a demand for an imaging lens with good processability and ultra-thinness. 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 good processability and satisfies the design requirements for ultra-thinness. [Means for solving the problem]

[0004] In order 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, and 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, and the second lens has an object side surface that is convex on the paraxial line. the third lens has an object side surface which is concave at the paraxial line and an image side surface which is concave at the paraxial line, the fourth lens has an object side surface which is convex at the paraxial line and an image side surface which is convex at the paraxial line, the fifth lens has an object side surface which is convex at the paraxial line and an image side surface which is concave at the paraxial line, the sixth lens has an object side surface which is convex at the paraxial line and an image side surface which is convex at the paraxial line, and the seventh lens has an object side surface which is convex at the paraxial line and an image side surface which is concave at the paraxial line, The axial distance from the image side surface of the seventh lens to the image surface is BF, the optical length of the imaging optical lens is TTL, the focal length of the sixth lens is f6, the focal length of the seventh lens is f7, the central radius of curvature of the object side surface of the sixth lens at the paraxial direction is R11, the central radius of curvature of the object side surface of the seventh lens at the paraxial direction is R13, the axial thickness of the first lens is d1, the axial distance between the first lens and the second lens is d2, the axial thickness of the second lens is d3, the axial thickness of the seventh lens is d13, and the thickness of the first lens along a direction parallel to the optical axis at a radius of 1.5 mm is d1 1.5 The thickness of the second lens in a direction parallel to the optical axis at a radius of 1.5 mm is d3 1.5 The thickness of the third lens in a direction parallel to the optical axis at a radius of 1.5 mm is d5. 1.5 The thickness of the fourth lens at a radius of 1.5 mm in a direction parallel to the optical axis is d7. 1.5 The thickness of the fifth lens at a radius of 1.5 mm in a direction parallel to the optical axis is d9 1.5 The thickness of the sixth lens at a radius of 1.5 mm in a direction parallel to the optical axis is d111.5 The thickness of the seventh lens at a radius of 1.5 mm in a direction parallel to the optical axis is d13 1.5 When this is set, the following conditional expressions (1) to (6) are satisfied. 0.16≦BF / TTL≦0.25 (1) 2.10≦f6 / R11-f7 / R13≦2.90 (2) 3.50≦(d1+d3) / d2≦9.00 (3) 0.90≦d1 1.5 / d13 1.5 ≦1.70 (4) 1.00≦(d3 1.5 +d5 1.5 +d7 1.5 ) / (d9 1.5 +d11 1.5 )≦1.80 (5) 1.10≦d13 1.5 / d13≦2.00 (6)

[0005] It is preferable that the following condition (7) be satisfied: 1.00≦d1 1.5 / d13 1.5 ≦1.50 (7)

[0006] It is preferable that the following condition (8) be satisfied: 1.20≦(d3 1.5 +d5 1.5 +d7 1.5 ) / (d9 1.5 +d11 1.5 )≦1.55 (8)

[0007] It is preferable that the following condition (9) be satisfied: 1.25≦d13 1.5 / d13≦1.80 (9)

[0008] Preferably, when the focal length of the third lens is f3, the focal length of the fourth lens is f4, the axial thickness of the third lens is d5, and the axial thickness of the fourth lens is d7, the following conditional formula (10) is satisfied. -120.00≦f3 / d5+f4 / d7≦-50.00 (10)

[0009] Preferably, when the central radius of curvature of the paraxial center of the object side surface of the fifth lens is R9 and the central radius of curvature of the paraxial center of the image side surface of the fifth lens is R10, the following conditional expression (11) is satisfied. 3.10≦(R9+R10) / (R9-R10)≦8.50 (11)

[0010] It is preferable that the following condition (12) be satisfied: -105.00≦f3 / d5+f4 / d7≦-60.00 (12)

[0011] It is preferable that the following condition (13) be satisfied: 3.80≦(R9+R10) / (R9-R10)≦7.00 (13)

[0012] Preferably, the first lens is made of a glass material.

[0013] The present invention further provides an imaging optical lens, the imaging optical lens being configured by a total of seven lenses, the seven lenses being, 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 having an object side surface which is convex in the paraxial direction and an image side surface which is concave in the paraxial direction, the second lens having an object side surface which is the third lens has an object side surface which is concave at the paraxial line and an image side surface which is concave at the paraxial line, the fourth lens has an object side surface which is convex at the paraxial line and an image side surface which is convex at the paraxial line, the fifth lens has an object side surface which is convex at the paraxial line and an image side surface which is concave at the paraxial line, the sixth lens has an object side surface which is convex at the paraxial line and an image side surface which is convex at the paraxial line, and the seventh lens has an object side surface which is convex at the paraxial line and an image side surface which is concave at the paraxial line, The focal length of the imaging optical lens is f, the composite focal length of the first lens and the second lens is f12, the axial thickness of the first lens is d1, the axial thickness of the second lens is d3, The axial thickness of the seventh lens is d13, and the thickness of the first lens at a radius of 1.5 mm along the direction parallel to the optical axis is d1 1.5 The thickness of the second lens in a direction parallel to the optical axis at a radius of 1.5 mm is d3 1.5 The thickness of the third lens in a direction parallel to the optical axis at a radius of 1.5 mm is d5. 1.5 The thickness of the fourth lens at a radius of 1.5 mm in a direction parallel to the optical axis is d7. 1.5 The thickness of the fifth lens at a radius of 1.5 mm in a direction parallel to the optical axis is d9 1.5 The thickness of the sixth lens at a radius of 1.5 mm in a direction parallel to the optical axis is d11 1.5 The thickness of the seventh lens at a radius of 1.5 mm in a direction parallel to the optical axis is d13 1.5 When a sum of on-axis thicknesses of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens is Σd and an optical length of the imaging optical lens is TTL, the following conditional expressions (4) to (6) and (14) to (16) are satisfied. 0.90≦d1 1.5 / d13 1.5 ≦1.70 (4) 1.00≦(d3 1.5 +d5 1.5 +d7 1.5 ) / (d9 1.5 +d11 1.5 )≦1.80 (5) 1.10≦d13 1.5 / d13≦2.00 (6) 0.30≦Σd / TTL≦0.65 (14) 1.20≦(d1+d3+d13) / d1≦2.30 (15) 0.90≦f12 / f≦1.60 (16)

[0014] It is preferable that the following condition (17) be satisfied: 0.38≦Σd / TTL≦0.58 (17)

[0015] It is preferable that the following condition (18) be satisfied: 1.50≦(d1+d3+d13) / d1≦2.00 (18)

[0016] It is preferable that the following condition (19) be satisfied: 1.10≦f12 / f≦1.40 (19)

[0017] It is preferable that the following condition (7) be satisfied: 1.00≦d1 1.5 / d13 1.5 ≦1.50 (7)

[0018] It is preferable that the following condition (8) be satisfied: 1.20≦(d3 1.5 +d5 1.5 +d7 1.5 ) / (d9 1.5 +d11 1.5 )≦1.55 (8)

[0019] It is preferable that the following condition (9) be satisfied: 1.25≦d13 1.5 / d13≦1.80 (9)

[0020] Preferably, when a central radius of curvature of the paraxial surface of the object side of the first lens is R1 and a central radius of curvature of the paraxial surface of the image side of the first lens is R2, the following conditional formula (20) is satisfied: -2.50≦(R1+R2) / (R1-R2)≦-1.60 (20)

[0021] Preferably, when the axial thickness of the fourth lens is d7, the axial distance between the fourth lens and the fifth lens is d8, and the axial thickness of the fifth lens is d9, the following conditional formula (21) is satisfied. 1.10≦(d7+d9) / d8≦2.10 (21)

[0022] It is preferable that the following condition (22) be satisfied: -2.20≦(R1+R2) / (R1-R2)≦-1.90 (22)

[0023] It is preferable that the following condition (23) be satisfied: 1.40≦(d7+d9) / d8≦1.75 (23)

[0024] Preferably, the first lens is made of a glass material. Effect of the Invention

[0025] The beneficial effects of the present invention are as follows: The imaging optical lens according to the present invention has excellent optical properties, good processability and extremely thinning properties, and is particularly applicable to imaging lens units of mobile phones, web imaging lenses and vehicle-mounted lenses, which are composed of imaging elements such as CCD and CMOS for high pixel counts.

[0026] In order to more clearly explain the technical solutions of the embodiments of the present invention, the following briefly introduces drawings required for the embodiments. Obviously, the drawings described below are only some embodiments of the present invention, and those skilled in the art can further obtain other drawings based on these drawings without any creative work. [Brief description of the drawings]

[0027] [Figure 1] 1 is a schematic diagram showing a configuration of an imaging optical lens according to a first embodiment of the present invention. [Diagram 2] 2 is a schematic diagram showing axial chromatic aberration of the imaging optical lens shown in FIG. [Diagram 3] 2 is a schematic diagram showing chromatic aberration of magnification of the imaging optical lens shown in FIG. [Figure 4] 2 is a schematic diagram showing the field curvature and distortion of the imaging optical lens shown in FIG. [Diagram 5] FIG. 4 is a schematic diagram showing the configuration of an imaging optical lens according to a second embodiment of the present invention. [Figure 6] 6 is a schematic diagram showing the longitudinal chromatic aberration of the imaging optical lens shown in FIG. 5. [Figure 7] 6 is a schematic diagram showing chromatic aberration of magnification of the imaging optical lens shown in FIG. 5. [Figure 8] 6 is a schematic diagram showing the field curvature and distortion of the imaging optical lens shown in FIG. 5. [Figure 9] FIG. 11 is a schematic diagram showing the configuration of an imaging optical lens according to a third embodiment of the present invention. [Figure 10] 10 is a schematic diagram showing the longitudinal chromatic aberration of the imaging optical lens shown in FIG. [Figure 11] 10 is a schematic diagram showing chromatic aberration of magnification of the imaging optical lens shown in FIG. [Figure 12] 10A and 10B are schematic diagrams showing the field curvature and distortion of the imaging optical lens shown in FIG. [Figure 13] FIG. 11 is a schematic diagram showing the configuration of an imaging optical lens according to a fourth embodiment of the present invention. [Figure 14] 14 is a schematic diagram showing the longitudinal chromatic aberration of the imaging optical lens shown in FIG. 13. [Figure 15] 14 is a schematic diagram showing chromatic aberration of magnification of the imaging optical lens shown in FIG. 13. [Figure 16] 14 is a schematic diagram showing the field curvature and distortion of the imaging optical lens shown in FIG. 13. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] In order to make the objectives, technical solutions and advantages of the present invention clearer, the following describes in detail each embodiment of the present invention with reference to the drawings. It is understood by those skilled in the art that many technical details are described in each embodiment of the present invention to better understand the present invention. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solution to be protected by the present invention can be realized.

[0029] As shown in Figs. 1 to 16, the technical solution of the present invention provides imaging optical lenses 10, 20, 30, and 40. Figs. 1, 5, 9, and 13 show the imaging optical lenses 10, 20, 30, and 40 according to the present invention, and the imaging optical lenses 10, 20, 30, and 40 include a total of seven lenses. 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 surface Si.

[0030] 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 lenses and plastic lenses serves to reduce chromatic aberration and improve the performance of the optical imaging lens. Each lens may be made of other materials.

[0031] The first lens has positive refractive power, and its object side surface is convex on the paraxial axis and its image side surface is concave on the paraxial axis; the second lens has negative refractive power, and its object side surface is convex on the paraxial axis and its image side surface is concave on the paraxial axis; the third lens has negative refractive power, and its object side surface is concave on the paraxial axis and its image side surface is concave on the paraxial axis; the fourth lens has positive refractive power, and its object side surface is convex on the paraxial axis and its image side surface is convex on the paraxial axis; the fifth lens has negative refractive power, and its object side surface is convex on the paraxial axis and its image side surface is concave on the paraxial axis; the sixth lens has positive refractive power, and its object side surface is convex on the paraxial axis and its image side surface is convex on the paraxial axis; and the seventh lens has negative refractive power, and its object side surface is convex on the paraxial axis and its image side surface is concave on the paraxial axis. The object side and image side surfaces of each lens may be arranged in other concave-convex distribution patterns.

[0032] The object side and image side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are all aspheric.

[0033] If the axial distance from the image side surface of the seventh lens to the image plane is defined as BF, and the optical length of the imaging optical lens is defined as TTL, then the conditional formula 0.16≦BF / TTL≦0.25 is satisfied, and by rationally arranging the back focus ratio of the optical system, the overall length of the optical system can be shortened to achieve a compact design. This is advantageous for rationally controlling the angle of incidence of the chief ray from the outermost field of view to the image plane, and avoids a decrease in relative illuminance caused by an excessively large angle of incidence of the chief ray in the outermost field of view, thereby being advantageous for improving the imaging quality of the optical system.

[0034] Defining the focal length of the sixth lens as f6, the focal length of the seventh lens as f7, the central radius of curvature at the paraxial surface of the object side of the sixth lens as R11, and the central radius of curvature at the paraxial surface of the object side of the seventh lens as R13, conditional formula 2.10≦f6 / R11-f7 / R13≦2.90 is satisfied. Rational control of the relationship between the focal lengths of the sixth and seventh lenses and the radii of curvature at the paraxial surface of the object side of the sixth and seventh lenses is advantageous for rational design of the angles of incidence of light rays on the object side surfaces of the sixth and seventh lenses, and is advantageous for achieving extremely thin lenses.

[0035] If we define the axial thickness of the first lens as d1, the axial distance between the first lens and the second lens as d2, and the axial thickness of the second lens as d3, then the conditional expression 3.50≦(d1+d3) / d2≦9.00 is satisfied. Within this range, it is easy to achieve good optical characteristics, wide angle, and extremely thin.

[0036] The thickness of the first lens at a radius of 1.5 mm along the direction parallel to the optical axis is d1. 1.5 The thickness of the seventh lens at a radius of 1.5 mm in the direction parallel to the optical axis is d13. 1.5 If we define it as 0.90≦d1, the condition 1.5 / d13 1.5By rationally controlling the ratio of the thicknesses of the first lens and the seventh lens in the direction parallel to the optical axis at a radius of 1.5 mm, it is advantageous to improve the workability of the lens and to realize an extremely thin lens. 1.5 / d13 1.5 Satisfy ≦1.50.

[0037] The thickness of the second lens parallel to the optical axis at a radius of 1.5 mm is d3 1.5 The thickness of the third lens at a radius of 1.5 mm along the direction parallel to the optical axis is d5. 1.5 , 4th The thickness of the lens parallel to the optical axis at a radius of 1.5 mm is d7 1.5 The thickness of the fifth lens at a radius of 1.5 mm in the direction parallel to the optical axis is d9. 1.5 The thickness of the sixth lens at a radius of 1.5 mm along the direction parallel to the optical axis is d11 1.5 If we define it as 1.00≦(d3 1.5 +d5 1.5 +d7 1.5 ) / (d9 1.5 +d11 1.5 )≦1.80. Rationally controlling the relationship between the thicknesses of the second lens to the sixth lens in the direction parallel to the optical axis at a radius of 1.5 mm is advantageous for correcting aberrations and shortening the optical length. Preferably, the condition 1.20≦(d3 1.5 +d5 1.5 +d7 1.5 ) / (d9 1.5 +d11 1.5 )≦1.55 is satisfied.

[0038] The axial thickness of the seventh lens is d13, and the thickness of the seventh lens along the direction parallel to the optical axis at a radius of 1.5 mm is d13. 1.5 If we define it as 1.10≦d13, the condition 1.5 / d13≦2.00 is satisfied. By rationally controlling the ratio of the thickness of the seventh lens in a direction parallel to the optical axis at a radius of 1.5 mm to the center thickness, it is advantageous to improve the workability of the lens and to improve the manufacturing yield. Preferably, the conditional formula 1.25≦d13 1.5 / d13≦1.80 is satisfied.

[0039] If the focal length of the third lens is defined as f3, the focal length of the fourth lens as f4, the axial thickness of the third lens as d5, and the axial thickness of the fourth lens as d7, the conditional formula -120.00 ≦ f3 / d5 + f4 / d7 ≦ -50.00 is satisfied. By rationally controlling the ratio of the axial thickness and the focal length of the third and fourth lenses, it is advantageous to realize a wide angle and to improve the processing yield of the third and fourth lenses. Preferably, the conditional formula -105.00 ≦ f3 / d5 + f4 / d7 ≦ -60.00 is satisfied.

[0040] If the central radius of curvature of the object side surface of the fifth lens at the paraxial center is defined as R9, and the central radius of curvature of the image side surface of the fifth lens at the paraxial center is defined as R10, the conditional formula 3.10≦(R9+R10) / (R9-R10)≦8.50 is satisfied. Within this range, the surface shape of the fifth lens can be adjusted to control the traveling direction of light rays, which contributes to achieving a balance between the field of view, the volume, and the size of the imaging surface. Preferably, the conditional formula 3.80≦(R9+R10) / (R9-R10)≦7.00 is satisfied.

[0041] If the sum of the axial thicknesses of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens is defined as Σd, and the optical length of the imaging optical lens is defined as TTL, then the conditional formula 0.30≦Σd / TTL≦0.65 is satisfied. By rationally controlling the ratio between the sum of the axial thicknesses of each lens and the optical length, an extremely thin structure is achieved. Preferably, the conditional formula 0.38≦Σd / TTL≦0.58 is satisfied.

[0042] 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 conditional formula 1.20≦(d1+d3+d13) / d1≦2.30 is satisfied. Rational control of the center thicknesses of the first lens, the second lens, and the seventh lens is advantageous in shortening the optical length. Preferably, the conditional formula 1.50≦(d1+d3+d13) / d1≦2.00 is satisfied.

[0043] If the focal length of the imaging optical lens is defined as f and the combined focal length of the first lens and the second lens as f12, the conditional expression 0.90≦f12 / f≦1.60 is satisfied. By rationally arranging the focal lengths of the first lens L1 and the second lens L2, chromatic aberration is eliminated, spherical aberration is reduced, astigmatism is corrected, and resolution is improved. Preferably, the conditional expression 1.10≦f12 / f≦1.40 is satisfied.

[0044] If the central radius of curvature of the object side surface of the first lens on the paraxial line is defined as R1, and the central radius of curvature of the image side surface of the first lens on the paraxial line is defined as R2, then the conditional formula -2.50≦(R1+R2) / ( R1-R2)≦-1.60 is satisfied. By rationally controlling the shape of the first lens, the surface shape and refractive power of the first lens can be adjusted, which contributes to receiving light rays at a larger angle of view. Preferably, the conditional expression -2.20≦(R1+R2) / (R1-R2)≦-1.90 is satisfied.

[0045] If the axial thickness of the fourth lens is defined as d7, the axial distance between the fourth lens and the fifth lens as d8, and the axial thickness of the fifth lens as d9, the conditional formula 1.10≦(d7+d9) / d8≦2.10 is satisfied. By rationally controlling the thickness and distance between the fourth lens and the fifth lens, it is advantageous to reduce the assembly sensitivity of the fourth lens and the fifth lens and improve the assembly yield. Preferably, the conditional formula 1.40≦(d7+d9) / d8≦1.75 is satisfied.

[0046] Compared with the prior art, the imaging optical lens according to the present invention satisfies the conditions 0.16≦BF / TTL≦0.25, 2.10≦f6 / R11-f7 / R13≦2.90, 3.50≦(d1+d3) / d2≦9.00, 0.90≦d1 1.5 / d13 1.5 ≦1.70, 1.00≦(d3 1.5 +d5 1.5 +d7 1.5 ) / (d9 1.5 +d11 1.5 )≦1.80, 1.10≦d13 1.5 By arranging the lenses so as to satisfy / d13≦2.00, the overall length of the optical system is shortened and a decrease in relative illuminance due to an excessively large angle of incidence of the chief ray at the outermost field of view is avoided, which is advantageous for improving the imaging quality of the optical system. In addition, by rationally designing the angle of incidence of the light rays on the object side surface of the sixth lens and the seventh lens, it is advantageous for realizing an extremely thin structure. It has good optical properties and satisfies wide angle and extremely thin. In addition, by rationally controlling the thickness of each lens along the direction parallel to the optical axis at a radius of 1.5 mm, it is advantageous for improving the processability of the lens, improving the manufacturing yield, and realizing an extremely thin structure.

[0047] Compared with the prior art, the imaging optical lens according to the present invention satisfies the condition 0.90≦d1 1.5 / d13 1.5 ≦1.70, 1.00≦(d3 1.5 +d5 1.5 +d7 1.5 ) / (d9 1.5 +d11 1.5 )≦1.80, 1.10≦d13 1.5 By arranging the lenses so as to satisfy / d13≦2.00, 0.30≦Σd / TTL≦0.65, 1.20≦(d1+d3+d13) / d1≦2.30, and 0.90≦f12 / f≦1.60, it is possible to satisfy the requirement of ultra-thinness, eliminate chromatic aberration, reduce spherical aberration, correct astigmatism, and improve resolution. In addition, by rationally controlling the thickness of each lens in the direction parallel to the optical axis at a radius of 1.5 mm, it is advantageous to improve the workability of the lens, improve the manufacturing yield, and realize ultra-thinness.

[0048] 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.

[0049] TTL: The optical length of the imaging optical lens (the axial distance from the object side of the first lens L1 to the image plane Si) in mm.

[0050] FNO: The ratio of the effective focal length of an imaging optical lens to the entrance pupil diameter.

[0051] Next, the technical solution of the present invention will be described in detail in four embodiments. If the above conditional formulas are not satisfied, the technical effects of the present invention cannot be achieved.

[0052] (First embodiment) Tables 1 and 2 show design data for the imaging optical lens 10 according to the first embodiment of the present invention.

[0053] [Table 1]

[0054] Here, the meaning of each symbol is as follows: S1: Aperture R: Radius of curvature at the center of the optical surface R1: The central radius of curvature of the object side surface of the first lens L1 on the paraxial line R2: The 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 paraxial surface of the second lens L2 on the object side R4: The central radius of curvature of the image side surface of the second lens L2 on the paraxial line R5: The central radius of curvature of the paraxial surface of the third lens L3 on the object side R6: The central radius of curvature of the image side surface of the third lens L3 on the paraxial line R7: The central radius of curvature of the paraxial surface of the fourth lens L4 on the object side 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 paraxial surface of the fifth lens L5 on the object side R10: The central radius of curvature of the image side surface of the fifth lens L5 on the paraxial line R11: The central radius of curvature of the paraxial surface of the sixth lens L6 on the object side 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 paraxial surface of the seventh lens L7 on the object side R14: The paraxial central radius of curvature of the image side of the seventh lens L7 R15: The central curvature radius of the object side of the optical filter GF R16: Radius of curvature of the center of the image side of the optical filter GF d: Axial thickness of lens, axial distance between lenses d0: The axial distance from the aperture stop S1 to the object side of the first lens L1 d1: Axial thickness of the first lens L1 d2: The axial distance from the image side surface of the first lens L1 to the object side surface of the second lens L2 d3: Axial thickness of the second lens L2 d4: The axial distance from the image side surface of the second lens L2 to the object side surface of the third lens L3 d5: Axial thickness of the third lens L3 d6: The axial distance from the image side surface of the third lens L3 to the object side surface of the fourth lens L4 d7: Axial thickness of the fourth lens L4 d8: The axial distance from the image side surface of the fourth lens L4 to the object side surface of the fifth lens L5 d9: Axial thickness of the fifth lens L5 d10: the axial distance from the image side surface of the fifth lens L5 to the object side surface of the sixth lens L6 d11: Axial thickness of the sixth lens L6 d12: Axial distance from the image side surface of the sixth lens L6 to the object side surface of the seventh lens L7 d13: Axial thickness of the seventh lens L7 d14: The axial distance from the image side of the seventh lens L7 to the object side of the optical filter GF d15: On-axis thickness of optical filter GF d16: The axial distance from the image side of the optical filter GF to the image plane Si nd: Refractive index of d line (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 L3 v4: Abbe number of the fourth lens L4 ν5: Abbe number of the fifth lens L5 v6: Abbe number of the sixth lens L6 v7: Abbe number of the seventh lens L7 vg: Abbe number of the optical filter GF

[0055] Table 2 shows the aspheric data of each lens in the imaging optical lens 10 of the first embodiment according to the present invention.

[0056] [Table 2]

[0057] For convenience, the aspheric surface of each lens surface is expressed by the following formula (24): However, the present invention is not particularly limited to the form of the aspheric polynomial of this formula (24).

[0058] z=(cr 2 ) / {1+[1-(k+1)(c 2 r 2 )] 1 / 2}+A4r 4 +A6r6 +A8r 8 +A10r 10 +A12r 12 +A14r 14 +A16r 16 +A18r 18 +A20r 20 +A22r 22 +A24r 24 +A26r 26 +A28r 28 +A30r 30 (twenty four)

[0059] 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 radius of 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 tangent plane that is tangent to the vertex of the aspheric surface on the optical axis).

[0060] Fig. 2 and Fig. 3 are schematic diagrams showing the axial chromatic aberration and lateral chromatic aberration of light having 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 field curvature and distortion aberration of light having a wavelength of 546 nm after passing through the imaging optical lens 10 according to the first embodiment. 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.

[0061] In this embodiment, the entrance pupil diameter ENPD of the imaging optical lens 10 is 4.901 mm, the image height IH of the full field of view (1.0 field of view) is 8.000 mm, the image height IH of the MIC field of view is 8.290 mm, the field of view FOV in the diagonal direction of the full field of view (1.0 field of view) is 84.13°, and the field of view FOV in the diagonal direction of the MIC field of view is 86.10°. The imaging optical lens 10 satisfies the design requirements of good processability and extremely thin design, its on-axis and off-axis chromatic aberrations are sufficiently corrected, and it has excellent optical characteristics.

[0062] 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.

[0063] Second embodiment The meanings of the symbols in the second embodiment are the same as those in the first embodiment.

[0064] FIG. 5 shows an imaging optical lens 20 according to a second embodiment of the present invention.

[0065] Tables 3 and 4 show design data for the imaging optical lens 20 according to the second embodiment of the present invention.

[0066] [Table 3]

[0067] Table 4 shows the aspheric data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.

[0068] [Table 4]

[0069] Fig. 6 and Fig. 7 are schematic diagrams showing the axial chromatic aberration and the chromatic aberration of magnification after light having wavelengths of 656 nm, 588 nm, 546 nm, 486 nm, and 436 nm has passed through the imaging optical lens 20 according to the second embodiment. Fig. 8 is a schematic diagram showing the field curvature and the distortion aberration after light having wavelength of 546 nm has passed through the imaging optical lens 20 according to the second embodiment. The field curvature S in Fig. 8 is the field curvature in the sagittal direction, and T is the field curvature in the tangential direction.

[0070] In this embodiment, the entrance pupil diameter ENPD of the imaging optical lens 20 is 4.868 mm, the image height IH of the full field of view (1.0 field of view) is 8.000 mm, the image height IH of the MIC field of view is 8.290 mm, the field of view FOV in the diagonal direction of the full field of view (1.0 field of view) is 84.97°, and the field of view FOV in the diagonal direction of the MIC field of view is 87.18°. The imaging optical lens 20 satisfies the design requirements of good processability and extremely thin design, its on-axis and off-axis chromatic aberrations are sufficiently corrected, and it has excellent optical characteristics.

[0071] Third embodiment The meanings of the symbols in the third embodiment are the same as those in the first embodiment.

[0072] FIG. 9 shows an imaging optical lens 30 according to a third embodiment of the present invention.

[0073] Tables 5 and 6 show design data for the imaging optical lens 30 according to the third embodiment of the present invention.

[0074] [Table 5]

[0075] Table 6 shows the aspheric data of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.

[0076] [Table 6]

[0077] Fig. 10 and Fig. 11 are schematic diagrams showing the axial chromatic aberration and the chromatic aberration of magnification after light of wavelengths 656 nm, 588 nm, 546 nm, 486 nm, and 436 nm has passed through the imaging optical lens 30 according to the third embodiment. Fig. 12 is a schematic diagram showing the field curvature and the distortion aberration after light of wavelength 546 nm has passed through the imaging optical lens 30 according to the third embodiment. The field curvature S in Fig. 12 is the field curvature in the sagittal direction, and T is the field curvature in the tangential direction.

[0078] In this embodiment, the entrance pupil diameter ENPD of the imaging optical lens 30 is 4.882 mm, the image height IH of the full field of view (1.0 field of view) is 8.000 mm, the image height IH of the MIC field of view is 8.290 mm, the field of view FOV in the diagonal direction of the full field of view (1.0 field of view) is 84.20°, and the field of view FOV in the diagonal direction of the MIC field of view is 86.07°. The imaging optical lens 30 satisfies the design requirements of good processability and extremely thin design, its on-axis and off-axis chromatic aberrations are sufficiently corrected, and it has excellent optical characteristics.

[0079] (Fourth embodiment) The meanings of the symbols in the fourth embodiment are the same as those in the first embodiment.

[0080] FIG. 13 shows an imaging optical lens 40 according to a fourth embodiment of the present invention.

[0081] Tables 7 and 8 show design data for the imaging optical lens 40 according to the fourth embodiment of the present invention.

[0082] [Table 7]

[0083] Table 8 shows the aspheric data of each lens in the imaging optical lens 40 according to the fourth embodiment of the present invention.

[0084] [Table 8]

[0085] Fig. 14 and Fig. 15 are schematic diagrams showing the axial chromatic aberration and the chromatic aberration of magnification after light having wavelengths of 656 nm, 588 nm, 546 nm, 486 nm, and 436 nm has passed through the imaging optical lens 40 according to the fourth embodiment. Fig. 16 is a schematic diagram showing the field curvature and distortion aberration after light having wavelength of 546 nm has passed 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.

[0086] In this embodiment, the entrance pupil diameter ENPD of the imaging optical lens 40 is 4.923 mm, the image height IH of the full field of view (1.0 field of view) is 8.000 mm, the image height IH of the MIC field of view is 8.200 mm, the field of view FOV in the diagonal direction of the full field of view (1.0 field of view) is 83.52°, and the field of view FOV in the diagonal direction of the MIC field of view is 84.97°. The imaging optical lens 40 satisfies the design requirements of good processability and extremely thin design, its on-axis and off-axis chromatic aberrations are sufficiently corrected, and it has excellent optical characteristics.

[0087] Table 9 below shows various numerical values ​​in each of the first, second, third and fourth embodiments and values ​​corresponding to the parameters defined in the conditional expressions.

[0088] [Table 9]

[0089] 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 application, various changes in form and details are possible without departing from the spirit and scope of the present invention.

Claims

1. 1. An imaging optical lens, comprising: The imaging optical lens is configured by seven lenses in total, 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, and the second lens has an object side surface that is convex on the paraxial line. , the image side surface is concave in the paraxial direction, the third lens has an object side surface concave in the paraxial direction and an image side surface concave in the paraxial direction, the fourth lens has an object side surface convex in the paraxial direction and an image side surface convex in the paraxial direction, the fifth lens has an object side surface convex in the paraxial direction and an image side surface concave in the paraxial direction, the sixth lens has an object side surface convex in the paraxial direction and an image side surface convex in the paraxial direction, and the seventh lens has an object side surface convex in the paraxial direction and an image side surface concave in the paraxial direction, The axial distance from the image side surface of the seventh lens to the image surface is BF, the optical length of the imaging optical lens is TTL, the focal length of the sixth lens is f6, the focal length of the seventh lens is f7, the central radius of curvature of the object side surface of the sixth lens at the paraxial direction is R11, the central radius of curvature of the object side surface of the seventh lens at the paraxial direction is R13, the axial thickness of the first lens is d1, the axial distance between the first lens and the second lens is d2, the axial thickness of the second lens is d3, the axial thickness of the seventh lens is d13, and the thickness of the first lens along a direction parallel to the optical axis at a radius of 1.5 mm is d1. １．５ The thickness of the second lens in a direction parallel to the optical axis at a radius of 1.5 mm is d3. １．５ The thickness of the third lens in a direction parallel to the optical axis at a radius of 1.5 mm is d5. １．５ The thickness of the fourth lens at a radius of 1.5 mm in a direction parallel to the optical axis is d7. １．５ The thickness of the fifth lens at a radius of 1.5 mm in a direction parallel to the optical axis is d9. １．５ The thickness of the sixth lens at a radius of 1.5 mm in a direction parallel to the optical axis is d11. １．５ The thickness of the seventh lens at a radius of 1.5 mm in a direction parallel to the optical axis is d13. １．５ and wherein the imaging optical lens satisfies the following conditional expressions (1) to (6): 0.16≦BF / TTL≦0.25 (1) 2.10≦f6 / R11-f7 / R13≦2.90 (2) 3.50≦(d1+d3) / d2≦9.00 (3) 0.90≦1 １．５ / d13 １．５ ≦1.70 (4) .0≦(3 １．５ )__ １．５ •) １．５ )(()) １．５ )) １．５ ≦). 1.10≦d13 １．５ / d13≦2.00 (6)

2. 2. The imaging optical lens according to claim 1, wherein the following conditional expression (7) is satisfied: 1.000≦d1 １．５ / d13 １．５ ≦1.50 (7)

3. 2. The imaging optical lens according to claim 1, wherein the following conditional expression (8) is satisfied: .. . . . . １．５ )__ １．５ •) １．５ )(()) １．５ )) １．５ ≦).

4. 2. The imaging optical lens according to claim 1, wherein the following conditional expression (9) is satisfied: 1.25≦d13 １．５ / d13≦1.80 (9)

5. 2. The imaging optical lens according to claim 1, wherein the following conditional expression (10) is satisfied when a focal length of the third lens is f3, a focal length of the fourth lens is f4, an axial thickness of the third lens is d5, and an axial thickness of the fourth lens is d7: -120.00≦f3 / d5+f4 / d7≦-50.00 (10)

6. 2. The imaging optical lens according to claim 1, wherein the following conditional expression (11) is satisfied when a central radius of curvature of a paraxial surface of the object side surface of the fifth lens is R9 and a central radius of curvature of a paraxial surface of the image side surface of the fifth lens is R10: 3.10≦(R9+R10) / (R9-R10)≦8.50 (11)

7. 6. The imaging optical lens according to claim 5, wherein the following conditional expression (12) is satisfied: -105.00≦f3 / d5+f4 / d7≦-60.00 (12)

8. 7. The imaging optical lens according to claim 6, wherein the following conditional expression (13) is satisfied: 3.80≦(R9+R10) / (R9-R10)≦7.00 (13)

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

10. 1. An imaging optical lens, comprising: The imaging optical lens is configured by seven lenses in total, 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, and the second lens has an object side surface that is convex on the paraxial line. , the image side surface is concave in the paraxial direction, the third lens has an object side surface concave in the paraxial direction and an image side surface concave in the paraxial direction, the fourth lens has an object side surface convex in the paraxial direction and an image side surface convex in the paraxial direction, the fifth lens has an object side surface convex in the paraxial direction and an image side surface concave in the paraxial direction, the sixth lens has an object side surface convex in the paraxial direction and an image side surface convex in the paraxial direction, and the seventh lens has an object side surface convex in the paraxial direction and an image side surface concave in the paraxial direction, The focal length of the imaging optical lens is f, the composite focal length of the first lens and the second lens is f12, the axial thickness of the first lens is d1, the axial thickness of the second lens is d3, the axial thickness of the seventh lens is d13, and the thickness of the first lens along a direction parallel to the optical axis at a radius of 1.5 mm is d1. １．５ The thickness of the second lens in a direction parallel to the optical axis at a radius of 1.5 mm is d3. １．５ The thickness of the third lens in a direction parallel to the optical axis at a radius of 1.5 mm is d5. １．５ The thickness of the fourth lens at a radius of 1.5 mm in a direction parallel to the optical axis is d7. １．５ The thickness of the fifth lens at a radius of 1.5 mm in a direction parallel to the optical axis is d9. １．５ The thickness of the sixth lens at a radius of 1.5 mm in a direction parallel to the optical axis is d11. １．５ The thickness of the seventh lens at a radius of 1.5 mm in a direction parallel to the optical axis is d13. １．５ the sum of on-axis thicknesses of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens is denoted by Σd, and the optical length of the imaging optical lens is denoted by TTL, the imaging optical lens satisfying the following conditional expressions (4) to (6) and (14) to (16): 0.90≦1 １．５ / d13 １．５ ≦1.70 (4) .0≦(3 １．５ )__ １．５ •) １．５ )(()) １．５ )) １．５ ≦). 1.10≦d13 １．５ / d13≦2.00 (6) 0.30≦Σd / TTL≦0.65 (14) 1.20≦(d1+d3+d13) / d1≦2.30 (15) 0.90≦f12 / f≦1.60 (16)

11. 11. The imaging optical lens according to claim 10, wherein the following conditional expression (17) is satisfied: 0.38≦Σd / TTL≦0.58 (17)

12. 11. The imaging optical lens according to claim 10, wherein the following conditional expression (18) is satisfied: 1.50≦(d1+d3+d13) / d1≦2.00 (18)

13. 11. The imaging optical lens according to claim 10, wherein the following conditional expression (19) is satisfied: 1.10≦f12 / f≦1.40 (19)

14. 11. The imaging optical lens according to claim 10, wherein the following conditional expression (7) is satisfied: 1.000≦d1 １．５ / d13 １．５ ≦1.50 (7)

15. 11. The imaging optical lens according to claim 10, wherein the following conditional expression (8) is satisfied: .. . . . . １．５ )__ １．５ •) １．５ )(()) １．５ )) １．５ ≦).

16. 11. The imaging optical lens according to claim 10, wherein the following conditional expression (9) is satisfied: 1.25≦d13 １．５ / d13≦1.80 (9)

17. 11. The imaging optical lens according to claim 10, wherein the following conditional expression (20) is satisfied, when a central radius of curvature of a paraxial surface of the object side of the first lens is R1 and a central radius of curvature of a paraxial surface of the image side of the first lens is R2: -2.50≦(R1+R2) / (R1-R2)≦-1.60 (20)

18. 11. The imaging optical lens according to claim 10, wherein the following conditional expression (21) is satisfied when an axial thickness of the fourth lens is d7, an axial distance between the fourth lens and the fifth lens is d8, and an axial thickness of the fifth lens is d9: 1.10≦(d7+d9) / d8≦2.10 (21)

19. 18. The imaging optical lens according to claim 17, wherein the following conditional expression (22) is satisfied: -2.20≦(R1+R2) / (R1-R2)≦-1.90 (22)

20. 19. The imaging optical lens according to claim 18, wherein the following conditional expression (23) is satisfied: 1.40≦(d7+d9) / d8≦1.75 (23)

21. The imaging optical lens according to claim 10, wherein the first lens is made of a glass material.

Images