Image capturing optical lens

Abstract

SOLUTION: The present invention relates to the field of optical lenses, in particular an image capturing optical lens comprising, in order from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens, and being configured to satisfy the following conditional expressions: 1.70≤n1≤2.20, 0.80≤f5 / f≤1.40, 0.70≤d3 / d5≤2.80.EFFECT: An image capturing optical lens provided herein has a wide angle of view and a large aperture stop with good optical performance.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to the field of optical lenses, and more particularly to an imaging optical lens that is applied to imaging devices such as mobile terminal devices such as smartphones and digital cameras, monitors, PC lenses, and vehicle-mounted camera lenses. [Background technology]

[0002] In recent years, the demand for small-sized photographic lenses has increased with the spread of smartphones. The light receiving element of a general photographic lens is only two types, a charge coupled device (CCD) and a complementary metal-oxide semiconductor sensor (CMOS sensor), and the pixel size of the light receiving element is reduced due to the progress of semiconductor manufacturing process technology. Furthermore, the current trend in electronic products is to develop better functionality and a lighter and thinner appearance, so small-sized photographic lenses with good image quality are the mainstream in the current market. In order to obtain better image quality, the conventional lenses installed in mobile phone cameras were mainly three or four lens structures. And with the development of technology and the diversification of user needs, the pixel area of ​​the light receiving element has been reduced, and the demand for system image quality has increased, so lenses with a seven-element structure are gradually appearing in lens design. Therefore, there is an urgent need to develop an ultra-thin wide-angle imaging optical lens with excellent optical characteristics. Summary of the Invention [Problem to be solved by the invention]

[0003] SUMMARY OF THE PRESENT DISCLOSURE In order to solve the above problems, an object of the present invention is to provide a photographic optical lens having good optical performance, a large aperture, and wide-angle optical performance. [Means for solving the problem]

[0004] In order to solve the above technical problems, the present invention provides a photographic optical lens including, in order from the object side to the image side, a first lens having negative refractive power, a second lens having positive refractive power, a third lens having positive refractive power, a fourth lens having negative refractive power, a fifth lens having positive refractive power, a sixth lens having negative refractive power, and a seventh lens having positive refractive power, wherein the following relational expression is satisfied, where n1 is the refractive index of the first lens, f5 is the focal length of the fifth lens, f is the focal length of the photographic optical lens, d3 is the axial thickness of the second lens, and d5 is the axial thickness of the third lens. 1.70 ≤ n1 ≤ 2.20; 0.80≦f5 / f≦1.40; 0.70≦d3 / d5≦2.80

[0005] Preferably, when the central radius of curvature of the object side surface of the fourth lens is R7 and the central radius of curvature of the image side surface of the fourth lens is R8, the following relational expression is satisfied. 2.00≦(R7+R8) / (R7-R8)≦4.00

[0006] Preferably, when an axial distance from the image side surface of the sixth lens to the object side surface of the seventh lens is d12 and an axial thickness of the sixth lens is d11, the following relational expression is satisfied. 1.30≦d12 / d11≦5.00

[0007] Preferably, when the focal length of the seventh lens is f7, the following relational expression is satisfied. 20.00≦f7 / f≦80.00

[0008] Preferably, the object side surface of the first lens is a convex surface paraxially, and its image side surface is a concave surface paraxially, and the following relational expression is satisfied when the focal length of the first lens is f1, the central radius of curvature of the object side surface of the first lens is R1, the central radius of curvature of the image side surface of the first lens is R2, the axial thickness of the first lens is d1, and the total optical length of the photographing optical lens is TTL. -3.11 ≤ f1 / f ≤ -0.85; 0.77≦(R1+R2) / (R1-R2)≦4.36; 0.02≦d1 / TTL≦0.20

[0009] Preferably, the photographing optical lens satisfies the following relational expression: -1.94 ≤ f1 / f ≤ -1.06; 1.23≦(R1+R2) / (R1-R2)≦3.49; 0.03≦d1 / TTL≦0.16

[0010] Preferably, the image side surface of the second lens is a convex surface paraxially, and when the focal length of the second lens is f2, the central radius of curvature of the object side surface of the second lens is R3, the central radius of curvature of the image side surface of the second lens is R4, and the total optical length of the photographing optical lens is TTL, the following relational expression is satisfied: 1.75≦f2 / f≦7.08; 0.35≦(R3+R4) / (R3-R4)≦1.85; 0.02≦d3 / TTL≦0.17

[0011] Preferably, the photographing optical lens satisfies the following relational expression: 2.80≦f2 / f≦5.66; 0.56≦(R3+R4) / (R3-R4)≦1.48; 0.03≦d3 / TTL≦0.14

[0012] Preferably, the object side surface of the third lens is a convex surface paraxially, and the following relational expression is satisfied when a focal length of the third lens is f3, a central radius of curvature of the object side surface of the third lens is R5, a central radius of curvature of the image side surface of the third lens is R6, and a total optical length of the photographing optical lens is TTL. 0.96≦f3 / f≦4.57; -2.07≦(R5+R6) / (R5-R6)≦-0.67; 0.02≦d5 / TTL≦0.08

[0013] Preferably, the photographing optical lens satisfies the following relational expression: 1.54≦f3 / f≦3.65; -1.29≦(R5+R6) / (R5-R6)≦-0.83; 0.03≦d5 / TTL≦0.06

[0014] Preferably, the object side surface of the fourth lens is a convex surface paraxially, and its image side surface is a concave surface paraxially, and the following relational expression is satisfied, where f4 is a focal length of the fourth lens, d7 is an axial thickness of the fourth lens, and TTL is a total optical length of the photographing optical lens. -9.49 ≤ f4 / f ≤ -1.67; 0.01≦d7 / TTL≦0.05

[0015] Preferably, the photographing optical lens satisfies the following relational expression: -5.93 ≤ f4 / f ≤ -2.09; 0.02≦d7 / TTL≦0.04

[0016] Preferably, the object side surface of the fifth lens is a convex surface paraxially, and its image side surface is a convex surface paraxially, and the following relational expressions are satisfied, where R9 is a central radius of curvature of the object side surface of the fifth lens, R10 is a central radius of curvature of the image side surface of the fifth lens, d9 is an axial thickness of the fifth lens, and TTL is an optical total length of the photographing optical lens. 0.04≦(R9+R10) / (R9-R10)≦0.40; 0.04≦d9 / TTL≦0.19

[0017] Preferably, the photographing optical lens satisfies the following relational expression: 0.06≦(R9+R10) / (R9-R10)≦0.32; 0.06≦d9 / TTL≦0.15

[0018] Preferably, the object side surface of the sixth lens is a paraxially convex surface, and the image side surface of the sixth lens is a paraxially concave surface, When the focal length of the sixth lens is f6, the central radius of curvature of the object side surface of the sixth lens is R11, the central radius of curvature of the image side surface of the sixth lens is R12, the axial thickness of the sixth lens is d11, and the total optical length of the photographing optical lens is TTL, the following relational expression is satisfied. -8.36 ≤ f6 / f ≤ -1.42; 1.29≦(R11+R12) / (R11-R12)≦8.65; 0.01≦d11 / TTL≦0.06

[0019] Preferably, the photographing optical lens satisfies the following relational expression: -5.22 ≤ f6 / f ≤ -1.78; 2.07≦(R11+R12) / (R11-R12)≦6.92; 0.02≦d11 / TTL≦0.05

[0020] Preferably, the object side surface of the seventh lens is a convex surface paraxially, and its image side surface is a concave surface paraxially, and the following relational expressions are satisfied when a central radius of curvature of the object side surface of the seventh lens is R13, a central radius of curvature of the image side surface of the seventh lens is R14, an axial thickness of the seventh lens is d13, and a total optical length of the photographing optical lens is TTL. 7.44≦(R13+R14) / (R13-R14)≦84.93; 0.04≦d13 / TTL≦0.21

[0021] Preferably, the photographing optical lens satisfies the following relational expression: 11.90≦(R13+R14) / (R13-R14)≦67.95; 0.06≦d13 / TTL≦0.17

[0022] Preferably, the total optical length TTL of the photographing optical lens is 9.03 mm or less.

[0023] Preferably, the total optical length TTL of the photographing optical lens is 8.62 mm or less.

[0024] Preferably, the aperture value FNO of the photographing optical lens is 2.27 or less.

[0025] Preferably, the aperture value FNO of the photographing optical lens is 2.22 or less.

[0026] Preferably, the field of view FOV of the photographing optical lens is 93° or less.

[0027] Preferably, the first lens is made of glass.

[0028] Preferably, the fifth lens is made of glass. Effect of the Invention

[0029] The advantageous effect of the present invention is that the photographic optical lens of the present invention has a large aperture with good optical performance and wide-angle optical performance, and is particularly applicable to mobile phone photographic lens assemblies, web photographic lenses, and vehicle-mounted camera lenses, which are made of photographic elements such as CCD and CMOS with a high number of pixels. [Brief description of the drawings]

[0030] [Figure 1] 1 is a conceptual diagram showing the structure of a photographic optical lens according to a first embodiment of the present invention. [Diagram 2] 2 is a conceptual diagram of on-axis aberration of the photographic optical lens shown in FIG. 1. [Diagram 3] 2 is a conceptual diagram of chromatic aberration of magnification of the photographic optical lens shown in FIG. 1. [Figure 4] 2 is a conceptual diagram of the field curvature and distortion of the photographic optical lens shown in FIG. 1. [Diagram 5] FIG. 4 is a conceptual diagram showing the structure of a photographic optical lens according to a second embodiment of the present invention. [Figure 6] 6 is a conceptual diagram of on-axis aberration of the photographing optical lens shown in FIG. 5. [Figure 7] 6 is a conceptual diagram of chromatic aberration of magnification of the photographing optical lens shown in FIG. 5. [Figure 8] 6 is a conceptual diagram of the field curvature and distortion of the photographing optical lens shown in FIG. 5. [Figure 9] FIG. 11 is a conceptual diagram showing the structure of a photographic optical lens according to a third embodiment of the present invention. [Figure 10] 10 is a conceptual diagram of on-axis aberration of the photographing optical lens shown in FIG. [Figure 11] 10 is a conceptual diagram of chromatic aberration of magnification of the photographing optical lens shown in FIG. [Figure 12] 10 is a conceptual diagram of the field curvature and distortion of the photographing optical lens shown in FIG. 9. [Figure 13] FIG. 11 is a conceptual diagram showing the structure of a photographic optical lens according to a fourth embodiment of the present invention. [Figure 14] 14 is a conceptual diagram of on-axis aberration of the photographing optical lens shown in FIG. 13. [Figure 15] 14 is a conceptual diagram of chromatic aberration of magnification of the photographing optical lens shown in FIG. 13. [Figure 16] 14 is a conceptual diagram of the field curvature and distortion of the photographing optical lens shown in FIG. 13. [Figure 17] FIG. 13 is a conceptual diagram showing the structure of a photographic optical lens according to a fifth embodiment of the present invention. [Figure 18] 18 is a conceptual diagram of on-axis aberration of the photographing optical lens shown in FIG. 17. [Figure 19] 18 is a conceptual diagram of chromatic aberration of magnification of the photographing optical lens shown in FIG. 17. [Figure 20] 18A and 18B are conceptual diagrams of the field curvature and distortion of the photographing optical lens shown in FIG. 17. [Figure 21] FIG. 13 is a conceptual diagram showing the structure of a photographic optical lens according to a sixth embodiment of the present invention. [Figure 22] 22 is a conceptual diagram of on-axis aberration of the photographing optical lens shown in FIG. 21. [Diagram 23] 22 is a conceptual diagram of chromatic aberration of magnification of the photographing optical lens shown in FIG. 21. [Figure 24] 22A and 22B are conceptual diagrams of field curvature and distortion of the photographing optical lens shown in FIG. 21. [Diagram 25] FIG. 2 is a conceptual diagram of the structure of a photographic optical lens of Comparative Example 1. [Figure 26] 26 is a conceptual diagram of on-axis aberration of the photographing optical lens shown in FIG. 25. [Figure 27] 26 is a conceptual diagram of chromatic aberration of magnification of the photographing optical lens shown in FIG. 25. [Figure 28] 26 is a conceptual diagram of the field curvature and distortion of the photographing optical lens shown in FIG. 25. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] 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 accompanying drawings. However, those skilled in the art can understand that in each embodiment of the present invention, many technical details are provided to enable the reader to better understand the present invention. However, the technical solutions claimed in this disclosure can be realized without these technical details and various changes and modifications based on the following embodiments.

[0032] (First Example) Referring to the accompanying drawings, the present invention provides a photographic optical lens 10. Fig. 1 shows a photographic optical lens 10 according to a first embodiment of the present invention, which includes seven lenses. Specifically, the photographic optical lens 10 includes, in order from the object side to the image side, a first lens L1, a second lens L2, an aperture S1, 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 an image surface Si.

[0033] In this embodiment, 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 glass, the sixth lens L6 is made of plastic, and the seventh lens L7 is made of plastic. This helps improve the system performance and system stability. In other embodiments, each lens may be made of other materials.

[0034] If the refractive index of the first lens L1 is n1, the relational expression 1.70≦n1≦2.20 is satisfied. The photographic optical lens 10 is preferably made of a high refractive index material, which contributes to a reduction in the front end aperture and an improvement in imaging quality.

[0035] If the focal length of the fifth lens L5 is f5 and the focal length of the photographing optical lens 10 is f, the relational expression of 0.80≦f5 / f≦1.40 is satisfied. By controlling the focal length value of the single lens and rationally allocating the focal lengths, it is possible to control the temperature drift and achieve good temperature performance.

[0036] If the axial thickness of the second lens L2 is d3 and the axial thickness of the third lens L3 is d5, the relational expression of 0.70≦d3 / d5≦2.80 is satisfied. Rational control of the lens thickness contributes to molding and assembly.

[0037] If the central radius of curvature of the object side surface of the fourth lens L4 is R7 and the central radius of curvature of the image side surface of the fourth lens L4 is R8, the relational expression of 2.00≦(R7+R8) / (R7-R8)≦4.00 is satisfied. By specifying the shape of the fourth lens, the balance of the field curvature of the system can be effectively adjusted, and the offset of the field curvature of the central field of view becomes 0.01 mm.

[0038] If the axial distance from the image side surface of the sixth lens L6 to the object side surface of the seventh lens L7 is d12 and the axial thickness of the sixth lens L6 is d11, the relational expression 1.30≦d12 / d11≦5.00 is satisfied. If the range of this conditional expression is satisfied, it is helpful to reduce the overall length of the optical system.

[0039] If the focal length of the seventh lens L7 is f7, then the relational expression 20.00≦f7 / f≦80.00 is satisfied. By specifying the ratio between the focal length of the last lens and the focal length of the system, if it is within the range of the conditional expression, the degree of deflection of the light passing through the lens can be reduced and the chromatic aberration can be effectively corrected, so that the chromatic aberration |LC|≦6.0 μm.

[0040] In this embodiment, the object side surface of the first lens L1 is a paraxially convex surface, and its image side surface is a paraxially concave surface, and the first lens L1 has a negative refractive power. In other alternative embodiments, the object side surface and the image side surface of the first lens L1 may have other concave and convex distribution shapes.

[0041] If the focal length of the entire photographic optical lens 10 is f and the focal length of the first lens L1 is f1, the relationship -3.11≦f1 / f≦-0.85 is satisfied, and the ratio of the focal length of the first lens L1 to the entire focal length is specified. If it is within this specified range, the first lens has an appropriate negative refractive power, which contributes to reducing system aberrations and contributing to the development of ultra-thin lenses and wide-angle lenses. Preferably, it satisfies -1.94≦f1 / f≦-1.06.

[0042] If the radius of curvature of the object side surface of the first lens L1 is R1 and the radius of curvature of the image side surface of the first lens L1 is R2, the relational expression of 0.77≦(R1+R2) / (R1-R2)≦4.36 is satisfied, and the shape of the first lens is reasonably controlled so that the first lens can effectively correct the spherical aberration of the system, and preferably, the relational expression of 1.23≦(R1+R2) / (R1-R2)≦3.49 is satisfied.

[0043] If the axial thickness of the first lens L1 is d1 and the total optical length of the photographing optical lens 10 is TTL, the relational expression 0.02≦d1 / TTL≦0.20 is satisfied, which contributes to the realization of an ultra-thin structure. Preferably, the relational expression 0.03≦d1 / TTL≦0.16 is satisfied.

[0044] In this embodiment, the object side surface of the second lens L2 is paraxially convex, and its image side surface is paraxially convex, and the second lens L2 has positive refractive power. In other alternative embodiments, the object side surface and the image side surface of the second lens L2 may have other concave and convex distribution shapes.

[0045] If the focal length of the entire photographic optical lens 10 is f and the focal length of the second lens L2 is f2, the ratio of the focal length of the second lens L2 to the entire focal length is specified by satisfying the relational expression of 1.75≦f2 / f≦7.08. If it is within this specified range, the second lens L2 has an appropriate positive refractive power and contributes to correcting the aberration of the optical system. Preferably, it satisfies 2.80≦f2 / f≦5.66.

[0046] If the radius of curvature of the center of the object side surface of the second lens L2 is R3 and the radius of curvature of the center of the image side surface of the second lens L2 is R4, the relationship of 0.35≦(R3+R4) / (R3-R4)≦1.85 is satisfied, and the shape of the second lens L2 is defined. If it is within this range, it contributes to correcting the problem of on-axis aberration as the lens becomes ultra-thin. Preferably, it satisfies 0.56≦(R3+R4) / (R3-R4)≦1.48.

[0047] If the axial thickness of the second lens L2 is d3 and the total optical length of the photographing optical lens 10 is TTL, the relational expression 0.02≦d3 / TTL≦0.17 is satisfied, and by defining the ratio between the axial thickness of the second lens L2 and the total optical length TTL of the photographing optical lens 10, it contributes to realizing an ultra-thin structure. Preferably, the relation 0.03≦d3 / TTL≦0.14 is satisfied.

[0048] In this embodiment, the object side surface of the third lens L3 is a paraxial convex surface, and its image side surface is a paraxial concave surface, and the third lens L3 has a positive refractive power. In other optional embodiments, the object side surface and the image side surface of the third lens L3 may have other concave and convex distribution shapes.

[0049] If the focal length of the entire photographing optical lens 10 is f and the focal length of the third lens L3 is f3, the ratio of the focal length of the third lens L3 to the entire focal length is specified by satisfying the relational expression of 0.96≦f3 / f≦4.57. Within this specified range, the third lens L3 has an appropriate positive refractive power, and the system has better imaging quality and relatively low sensitivity due to the reasonable distribution of diopters (refractive power, the reciprocal of focal length, Diopter). Preferably, it satisfies 1.54≦f3 / f≦3.65.

[0050] If the central radius of curvature of the object side surface of the third lens L3 is R5 and the central radius of curvature of the image side surface of the third lens L3 is R6, the relational expression of -2.07≦(R5+R6) / (R5-R6)≦-0.67 is satisfied, the shape of the third lens L3 can be effectively controlled, contributing to the molding of the third lens L3 and preventing molding defects and stress caused by an excessively large surface curvature of the third lens L3. Preferably, the relational expression of -1.29≦(R5+R6) / (R5-R6)≦-0.83 is satisfied.

[0051] If the axial thickness of the third lens L3 is d5 and the total optical length of the photographing optical lens 10 is TTL, the relational expression 0.02≦d5 / TTL≦0.08 is satisfied, which contributes to the realization of an ultra-thin structure. Preferably, the relational expression 0.03≦d5 / TTL≦0.06 is satisfied.

[0052] In this embodiment, the object side surface of the fourth lens L4 is a paraxial convex surface, and its image side surface is a paraxial concave surface, and the fourth lens L4 has a negative refractive power. In other alternative embodiments, the object side surface and the image side surface of the fourth lens L4 may have other concave and convex distribution shapes.

[0053] Assuming that the focal length of the entire photographing optical lens 10 is f and the focal length of the fourth lens L4 is f4, the ratio of the focal length of the fourth lens L4 to the entire focal length satisfies the relational expression of -9.49≦f4 / f≦-1.67. Within this range, the fourth lens L4 has an appropriate negative refractive power. With a reasonable distribution of diopters, the system has better imaging quality and relatively low sensitivity. Preferably, it satisfies -5.93≦f4 / f≦-2.09.

[0054] If the axial thickness of the fourth lens L4 is d7 and the total optical length of the photographing optical lens 10 is TTL, the relational expression of 0.01≦d7 / TTL≦0.05 is satisfied, and by defining the ratio between the axial thickness of the fourth lens L4 and the total optical length TTL of the photographing optical lens 10, it contributes to realizing an ultra-thin structure. Preferably, the relation of 0.02≦d7 / TTL≦0.04 is satisfied.

[0055] In this embodiment, the object side surface of the fifth lens L5 is a paraxial convex surface, and its image side surface is a paraxial convex surface, and the fifth lens L5 has a positive refractive power. In other optional embodiments, the object side surface and the image side surface of the fifth lens L5 may have other concave and convex distribution shapes.

[0056] If the radius of curvature of the object side surface of the fifth lens L5 is R9 and the radius of curvature of the image side surface of the fifth lens L5 is R10, the relational expression of 0.04≦(R9+R10) / (R9-R10)≦0.40 is satisfied, and this defines the shape of the fifth lens L5. If it is within this conditional range, it contributes to correcting problems such as off-axis angle of view aberrations as the lens becomes ultra-thin. Preferably, it satisfies 0.06≦(R9+R10) / (R9-R10)≦0.32.

[0057] If the axial thickness of the fifth lens L5 is d9 and the total optical length of the photographing optical lens 10 is TTL, the relational expression 0.04≦d9 / TTL≦0.19 is satisfied, which contributes to the realization of an ultra-thin structure. Preferably, the relation 0.06≦d9 / TTL≦0.15 is satisfied.

[0058] In this embodiment, the object side surface of the sixth lens L6 is a paraxially convex surface, and its image side surface is a paraxially concave surface, and the sixth lens L6 has a negative refractive power. In other alternative embodiments, the object side surface and the image side surface of the sixth lens L6 may have other concave and convex distribution shapes.

[0059] The focal length of the entire photographing optical lens 10 is f, and the focal length of the sixth lens L6 is f6, which satisfies the relational expression of -8.36≦f6 / f≦-1.42, and specifies the ratio of the focal length of the sixth lens L6 to the entire focal length. Within this range, the sixth lens L6 has an appropriate negative refractive power, and the system has better imaging quality and lower sensitivity due to the reasonable allocation of diopters. Preferably, it satisfies -5.22≦f6 / f≦-1.78.

[0060] If the radius of curvature of the center of the object side surface of the sixth lens L6 is R11 and the radius of curvature of the center of the image side surface of the sixth lens L6 is R12, the relational expression of 1.29≦(R11+R12) / (R11-R12)≦8.65 is satisfied, and this defines the shape of the sixth lens L6. If it is within this conditional range, it contributes to correcting problems such as off-axis angle of view aberrations as the lens becomes ultra-thin. Preferably, it satisfies 2.07≦(R11+R12) / (R11-R12)≦6.92.

[0061] If the axial thickness of the sixth lens L6 is d11 and the total optical length of the photographing optical lens is TTL, the relational expression of 0.01≦d11 / TTL≦0.06 is satisfied, which defines the ratio between the axial thickness of the sixth lens L6 and the total optical length TTL of the photographing optical lens 10 and contributes to realizing an ultra-thin structure. Preferably, the relational expression of 0.02≦d11 / TTL≦0.05 is satisfied.

[0062] In this embodiment, the object side surface of the seventh lens L7 is a paraxial convex surface, and its image side surface is a paraxial concave surface, and the seventh lens L7 has a positive refractive power. In other alternative embodiments, the object side surface and the image side surface of the seventh lens L7 may have other concave and convex distribution shapes.

[0063] If the radius of curvature of the center of the object side surface of the seventh lens L7 is R13 and the radius of curvature of the center of the image side surface of the seventh lens L7 is R14, the relational expression of 7.44≦(R13+R14) / (R13-R14)≦84.93 is satisfied, and this defines the shape of the seventh lens L7. If it is within this conditional range, it contributes to correcting problems such as off-axis angle of view aberrations as the lens becomes ultra-thin. Preferably, it satisfies 11.90≦(R13+R14) / (R13-R14)≦67.95.

[0064] If the axial thickness of the seventh lens L7 is d13 and the total optical length of the photographing optical lens 10 is TTL, the relational expression 0.04≦d13 / TTL≦0.21 is satisfied, which contributes to the realization of an ultra-thin structure. Preferably, the relational expression 0.06≦d13 / TTL≦0.17 is satisfied.

[0065] In this embodiment, the aperture value FNO of the photographic optical lens 10 is 2.27 or less, which is a large aperture and provides excellent imaging performance. Preferably, the aperture value FNO is 2.22 or less.

[0066] In this embodiment, the viewing angle FOV of the photographing optical lens 10 is 93° or more, thereby realizing a wide angle.

[0067] When the focal length of the photographic optical lens 10 of the present invention, the focal length of each lens, the axial distance from the image side surface to the object side surface of the associated lens, and the axial thickness satisfy the above-mentioned relational expressions, the photographic optical lens 10 has a large aperture with good optical performance and is a wide-angle optical photographic lens.

[0068] The photographic optical lens 10 of the present invention will be described below using examples. The symbols used in each example are as follows. The focal length, axial distance, radius of curvature, axial thickness, inflection point position, and stationary point position are all in mm.

[0069] TTL: Optical length (axial distance from the object side of the first lens L1 to the image plane), in mm; Aperture value FNO: The ratio of the effective focal length of a photographic lens to the diameter of the entrance pupil

[0070] Preferably, the object side surface and / or the image side surface of the lens may further be provided with an inflection point and / or a constant point, so as to meet the high quality imaging requirements.

[0071] Tables 1 and 2 show design data for the photographic optical lens 10 according to the first embodiment of the present invention. [Table 1] The meaning of each symbol is as follows. S1: aperture; R: radius of curvature of the optical surface, in the case of a lens, the central radius of curvature; R1: radius of curvature of the object side surface of the first lens L1; R2: radius of curvature of the image side surface of the first lens L1; R3: radius of curvature of the object side surface of the second lens L2; R4: radius of curvature of the image side surface of the second lens L2; R5: radius of curvature of the object side surface of the third lens L3; R6: radius of curvature of the image side surface of the third lens L3; R7: radius of curvature of the object side surface of the fourth lens L4; R8: radius of curvature of the image side surface of the fourth lens L4; R9: radius of curvature of the object side surface of the fifth lens L5; R10: radius of curvature of the image side surface of the fifth lens L5; R11: radius of curvature of the object side surface of the sixth lens L6; R12: radius of curvature of the image side surface of the sixth lens L6; R13: radius of curvature of the object side surface of the seventh lens L7; R14: radius of curvature of the image side surface of the seventh lens L7; R15: Radius of curvature of the object side surface of the optical filter GF; R16: Radius of curvature of the image side of the optical filter GF; d: axial thickness of the lens and axial distance between the lenses; d0: the axial distance from the aperture stop S1 to the object side of the first lens L1; d1: axial thickness of the first lens L1; d2: the axial distance from the image side 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: 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 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: the on-axis thickness of the optical filter GF; d16: Axial distance from the image side of the optical filter GF to the image plane; nd: refractive index of d line (d line is green light with a wavelength of 550 nm); nd1: refractive index of the first lens L1 at the d line; nd2: refractive index of the second lens L2 at the d line; nd3: refractive index of the third lens L3 at the d line; nd4: refractive index of the d line of the fourth lens L4; nd5: refractive index of the d line of the fifth lens L5; nd6: refractive index of the d line of the sixth lens L6; nd7: refractive index of the seventh lens L7 at the d line; ndg: refractive index of the d line of the optical filter GF; vd: Abbe number; v1: Abbe number of the first lens L1; v2: Abbe number of the second lens L2; v3: Abbe number of the third lens L3; v4: Abbe number of the fourth lens L4; v5: Abbe number of the fifth lens L5; v6: Abbe number of the sixth lens L6; v7: Abbe number of the seventh lens L6; vg: Abbe number of the optical filter GF.

[0072] Table 2 shows the aspheric data of each lens in the photographic optical lens 10 according to the first embodiment of the present invention.

[0073] [Table 2]

[0074] For convenience, the aspheric surface of each lens surface is expressed by the following formula (1): However, the present invention is not limited to the form of the aspheric polynomial expressed by formula (1). z=(cr 2 ) / {1+[1-(k+1)(c 2 r 2 )] 1 / 2}+A4r 4 +A6r 6 +A8r 8 +A10r 10 +A12r 12 +A14r 14 +A16r 16 +A18r 18 +A20r 20 +A20r 22 (1)

[0075] where k is the conic coefficient, A4, A6, A8, A10, A12, A14, A16, A18, A20, and A22 are aspheric coefficients, c is the curvature of 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 depth of the aspheric surface (the perpendicular distance between a point on the aspheric surface that is a distance r from the optical axis and the surface that is tangent to the vertex of the aspheric surface on the optical axis).

[0076] Tables 3 and 4 show the design data of the inflection points and stationary points of each lens in the photographic optical lens 10 of the first embodiment of the present invention. P1R1 and P1R2 respectively represent the object side surface and image side surface of the first lens L1, P2R1 and P2R2 respectively represent the object side surface and image side surface of the second lens L2, P3R1 and P3R2 respectively represent the object side surface and image side surface of the third lens L3, P4R1 and P4R2 respectively represent the object side surface and image side surface of the fourth lens L4, P5R1 and P5R2 respectively represent the object side surface and image side surface of the fifth lens L5, P6R1 and P6R2 respectively represent the object side surface and image side surface of the sixth lens L6, and P7R1 and P7R2 respectively represent the object side surface and image side surface of the seventh lens L7. The data corresponding to the column "inflection point position" is the vertical distance from the inflection point provided on the surface of each lens to the photographic optical lens 10 optical axis. The data corresponding to the “fixed point position” column is the vertical distance from a fixed point provided on the surface of each lens to the optical axis of the photographing optical lens 10 .

[0077] [Table 3]

[0078] [Table 4]

[0079] Fig. 2 and Fig. 3 are conceptual diagrams of the axial aberration and lateral chromatic aberration of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm, respectively, after passing through the photographing optical lens 10 of the first embodiment. Fig. 4 is a conceptual diagram of the field curvature and distortion of light with a wavelength of 555 nm after passing through the photographing optical lens 10 of 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 meridian direction.

[0080] Table 29 described later shows the numerical values ​​of each of Examples 1, 2, 3, 4, 5, and 6 and the values ​​corresponding to the parameters defined in the conditional expressions.

[0081] As shown in Table 29, the first embodiment satisfies each of the conditional expressions.

[0082] In this embodiment, the entrance pupil diameter ENPD of the photographic optical lens 10 is 1.073 mm, the full field of view image height IH is 3.711 mm, and the diagonal field of view angle FOV is 133.58°. The photographic optical lens 10 has good optical performance, and furthermore, has a large aperture, is ultra-thin, has a wide angle, yet is compact, has small aberration, small chromatic aberration, and has a high resolution of up to 5M. In addition, the back focus is long, which makes it easy to assemble and low-cost.

[0083] (Second Example) The second embodiment is basically the same as the first embodiment, and the symbols have the same meanings as in the first embodiment. Only the differences will be explained below.

[0084] Tables 5 and 6 show design data for the photographic optical lens 20 according to the second embodiment of the present invention.

[0085] [Table 5]

[0086] Table 6 shows the aspheric data of each lens in the photographic optical lens 20 according to the second embodiment of the present invention.

[0087] [Table 6]

[0088] Tables 7 and 8 show design data for the inflection points and steady points of each lens in the photographic optical lens 20 according to the second embodiment of the present invention.

[0089] [Table 7]

[0090] [Table 8]

[0091] Fig. 6 and Fig. 7 are conceptual diagrams of axial aberration and lateral chromatic aberration after light of wavelengths 650 nm, 610 nm, 555 nm, 510 nm and 470 nm passes through the photographing optical lens 20 of the second embodiment, respectively. Fig. 8 is a conceptual diagram of field curvature and distortion after light of wavelength 555 nm passes through the photographing optical lens 20 of the second embodiment, where the field curvature S in Fig. 8 is the field curvature in the sagittal direction and T is the field curvature in the meridian direction.

[0092] As shown in Table 29, the second embodiment satisfies each of the conditional expressions.

[0093] In this embodiment, the entrance pupil diameter ENPD of the photographic optical lens 20 is 1.377 mm, the full field of view image height IH is 3.711 mm, and the diagonal field of view angle FOV is 93.42°. The photographic optical lens 20 has good optical performance, and furthermore, has a large aperture, is ultra-thin, has a wide angle, yet is compact, has small aberration, small chromatic aberration, and has a high resolution of up to 5M. In addition, the back focus is long, which makes it easy to assemble and low-cost.

[0094] (Third Example) The third embodiment is basically the same as the first embodiment, and the symbols have the same meanings as in the first embodiment. Only the differences will be explained below.

[0095] In this embodiment, the object side surface of the second lens L2 is paraxially concave.

[0096] Tables 9 and 10 show design data for the photographic optical lens 30 according to the third embodiment of the present invention.

[0097] [Table 9]

[0098] Table 10 shows the aspheric data of each lens in the photographic optical lens 30 according to the third embodiment of the present invention. [Table 10]

[0099] Tables 11 and 12 show design data for the inflection points and steady points of each lens in the photographic optical lens 30 according to the third embodiment of the present invention.

[0100] [Table 11]

[0101] [Table 12]

[0102] Fig. 10 and Fig. 11 are conceptual diagrams of the axial aberration and lateral chromatic aberration of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm, respectively, after passing through the photographing optical lens 30 of the third embodiment. Fig. 12 is a conceptual diagram of the field curvature and distortion of light with wavelength of 555 nm after passing through the photographing optical lens 30 of the third embodiment, where the field curvature S in Fig. 12 is the field curvature in the sagittal direction, and T is the field curvature in the meridian direction.

[0103] As shown in Table 29, the third embodiment satisfies each of the conditional expressions.

[0104] In this embodiment, the entrance pupil diameter ENPD of the photographic optical lens 30 is 1.242 mm, the full field of view image height IH is 3.711 mm, and the diagonal field of view angle FOV is 98.48°. The photographic optical lens 30 has good optical performance, a large aperture, is ultra-thin, has a wide angle, yet is compact, has small aberration, small chromatic aberration, and has a high resolution of up to 5M. In addition, the back focus is long, making it easy to assemble and low cost.

[0105] (Fourth Example) The fourth embodiment is basically the same as the first embodiment, and the symbols have the same meanings as those in the first embodiment. Only the differences will be explained below.

[0106] In this embodiment, the object side surface of the second lens L2 is paraxially concave.

[0107] Tables 13 and 14 show design data for the photographic optical lens 40 according to the fourth embodiment of the present invention.

[0108] [Table 13]

[0109] Table 14 shows the aspheric data of each lens in the photographic optical lens 40 according to the fourth embodiment of the present invention.

[0110] [Table 14]

[0111] Tables 15 and 16 show design data for the inflection points and steady points of each lens in the photographic optical lens 40 according to the fourth embodiment of the present invention.

[0112] [Table 15]

[0113] [Table 16]

[0114] Fig. 14 and Fig. 15 are conceptual diagrams of the axial aberration and lateral chromatic aberration of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm, respectively, after passing through the photographing optical lens 40 of the fourth embodiment. Fig. 16 is a conceptual diagram of the field curvature and distortion of light with wavelength of 555 nm after passing through the photographing optical lens 40 of the fourth embodiment, where the field curvature S in Fig. 16 is the field curvature in the sagittal direction, and T is the field curvature in the meridian direction.

[0115] As shown in Table 29, the fourth embodiment satisfies each of the conditional expressions.

[0116] In this embodiment, the entrance pupil diameter ENPD of the photographing optical lens 40 is 0.968 mm, the full field of view image height IH is 3.711 mm, and the diagonal field of view angle FOV is 113.44°. The photographing optical lens 40 has good optical performance, and furthermore, has a large aperture, is ultra-thin, has a wide angle, yet is compact, has small aberration, small chromatic aberration, and has a high resolution of up to 5M. In addition, the back focus is long, which makes it easy to assemble and low-cost.

[0117] (Fifth Example) The fifth embodiment is basically the same as the first embodiment, and the symbols have the same meanings as those in the first embodiment. Only the differences will be explained below.

[0118] Tables 17 and 18 show design data for the photographic optical lens 50 according to the fifth embodiment of the present invention.

[0119] [Table 17]

[0120] Table 18 shows the aspheric data of each lens in the photographic optical lens 50 according to the fifth embodiment of the present invention.

[0121] [Table 18]

[0122] Tables 19 and 20 show design data for the inflection points and steady points of each lens in the photographic optical lens 50 according to the fifth embodiment of the present invention.

[0123] [Table 19]

[0124] [Table 20]

[0125] Fig. 18 and Fig. 19 are conceptual diagrams of axial aberration and lateral chromatic aberration, respectively, after light of wavelengths 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm passes through the photographic optical lens 50 of the fifth embodiment. Fig. 20 is a conceptual diagram of field curvature and distortion after light of wavelength 555 nm passes through the photographic optical lens 50 of the fifth embodiment, where the field curvature S in Fig. 20 is the field curvature in the sagittal direction, and T is the field curvature in the meridian direction.

[0126] As shown in Table 29, the fifth embodiment satisfies each of the conditional expressions.

[0127] In this embodiment, the entrance pupil diameter ENPD of the photographic optical lens 50 is 0.862 mm, the full field of view image height IH is 3.711 mm, and the diagonal field of view angle FOV is 138.02°. The photographic optical lens 50 has good optical performance, and furthermore, has a large aperture, is ultra-thin, has a wide angle, yet is compact, has small aberration, small chromatic aberration, and has a high resolution of up to 5M. In addition, the back focus is long, which makes it easy to assemble and low-cost.

[0128] (Sixth Example) The sixth embodiment is basically the same as the first embodiment, and the symbols have the same meanings as in the first embodiment. Only the differences will be explained below.

[0129] In this embodiment, the image side surface of the third lens L3 is a paraxial convex surface.

[0130] Tables 21 and 22 show design data for the photographic optical lens 60 according to the sixth embodiment of the present invention.

[0131] [Table 21]

[0132] Table 22 shows the aspheric data of each lens in the photographic optical lens 60 according to the sixth embodiment of the present invention. [Table 22]

[0133] Tables 23 and 24 show design data for the inflection points and steady points of each lens in the photographic optical lens 60 according to the sixth embodiment of the present invention.

[0134] [Table 23]

[0135] [Table 24]

[0136] Fig. 22 and Fig. 23 are conceptual diagrams of axial aberration and lateral chromatic aberration of light having wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm, respectively, after passing through the photographing optical lens 60 of the sixth embodiment. Fig. 24 is a conceptual diagram of field curvature and distortion of light having a wavelength of 555 nm after passing through the photographing optical lens 60 of the sixth embodiment, where the field curvature S in Fig. 24 is the field curvature in the sagittal direction, and T is the field curvature in the meridian direction.

[0137] As shown in Table 29, the sixth embodiment satisfies each of the conditional expressions.

[0138] In this embodiment, the entrance pupil diameter ENPD of the photographing optical lens 60 is 1.025 mm, the full field of view image height IH is 3.711 mm, and the diagonal field of view angle FOV is 122.50°. The photographing optical lens 60 has good optical performance, a large aperture, is ultra-thin, has a wide angle, yet is compact, has small aberration, small chromatic aberration, and has a high resolution of up to 5M. In addition, the back focus is long, making it easy to assemble and low cost.

[0139] Comparative Example 1 Comparative Example 1 is basically the same as Example 1, and the symbols have the same meanings as Example 1. Only the differences will be described below.

[0140] In Comparative Example 1, the image side surface of the third lens L3 is a paraxial convex surface.

[0141] Tables 25 and 26 show the design data of the photographing optical lens 70 of Comparative Example 1.

[0142] [Table 25]

[0143] Table 26 shows the aspheric data of each lens in the photographic optical lens 70 of Comparative Example 1.

[0144] [Table 26]

[0145] Tables 27 and 28 show the design data of the inflection points and steady points of each lens in the photographic optical lens 70 of Comparative Example 1.

[0146] [Table 27]

[0147] [Table 28]

[0148] Fig. 26 and Fig. 27 are conceptual diagrams of axial aberration and lateral chromatic aberration after light of wavelengths 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm passes through the photographing optical lens 70 of Comparative Example 1. Fig. 28 is a conceptual diagram of field curvature and distortion after light of wavelength 555 nm passes through the photographing optical lens 70 of Comparative Example 1, where the field curvature S in Fig. 28 is the field curvature in the sagittal direction, and T is the field curvature in the meridian direction.

[0149] Table 29 shows the numerical values ​​of the corresponding relational expressions in accordance with the above relational expressions in Comparative Example 1. It should be noted that the photographing optical lens 70 of Comparative Example 1 does not satisfy the above relational expression 1.70≦n1≦2.20.

[0150] In Comparative Example 1, the entrance pupil diameter ENPD of the photographing optical lens 70 is 1.078 mm, the full-field image height IH is 3.711 mm, and the diagonal field of view angle FOV is 87.73°. Since the aberration of the photographing optical lens 50 is not sufficiently corrected, it is disadvantageous to a reduction in the aperture at the front end, and the optical performance is not excellent enough.

[0151] [Table 29] FOV refers to the diagonal viewing angle of the photographing optical lens.

[0152] Although the embodiments of the present invention have been described in detail above, those skilled in the art can make modifications without departing from the spirit of the present invention, and all such modifications are within the scope of the present invention.

Claims

1. A photographic optical lens, the photographing optical lens includes, in order from the object side to the image side, a first lens having negative refractive power, a second lens having positive refractive power, a third lens having positive refractive power, a fourth lens having negative refractive power, a fifth lens having positive refractive power, a sixth lens having negative refractive power, and a seventh lens having positive refractive power; a refractive index of the first lens, a focal length of the fifth lens, a focal length of the photographic optical lens, f, an axial thickness of the second lens, and an axial thickness of the third lens, the following relational expression is satisfied: 1.70≦n1≦2.20; 0.80≦f5 / f≦1.40; 0.70≦d3 / d5≦2.80

2. 2. The photographic optical lens according to claim 1, wherein the following relation is satisfied, where R7 is a central radius of curvature of the object side surface of the fourth lens, and R8 is a central radius of curvature of the image side surface of the fourth lens: 2.00≦(R7+R8) / (R7-R8)≦4.

00.

3. 2. The photographic optical lens according to claim 1, wherein the following relational expression is satisfied, where d12 is an axial distance from an image side surface of the sixth lens to an object side surface of the seventh lens, and d11 is an axial thickness of the sixth lens. 1.30≦d12 / d11≦5.00

4. 2. The photographic optical lens according to claim 1, wherein the following relation is satisfied, where f7 is a focal length of the seventh lens: 20.00≦f7 / f≦80.00

5. the object side surface of the first lens is a paraxially convex surface, and the image side surface of the first lens is a paraxially concave surface; 2. The photographic optical lens according to claim 1, wherein the following relational expression is satisfied, where f1 is a focal length of the first lens, R1 is a central radius of curvature of an object side surface of the first lens, R2 is a central radius of curvature of an image side surface of the first lens, d1 is an axial thickness of the first lens, and TTL is a total optical length of the photographic optical lens. −3.11≦f1 / f≦−0.85; 0.77≦(R1+R2) / (R1-R2)≦4.36; 0.02≦d1 / TTL≦0.20

6. the image side surface of the second lens is a paraxial convex surface; 2. The photographic optical lens according to claim 1, wherein the following relational expression is satisfied, where f2 is a focal length of the second lens, R3 is a central radius of curvature of the object side surface of the second lens, R4 is a central radius of curvature of the image side surface of the second lens, and TTL is a total optical length of the photographic optical lens. 1.75≦f2 / f≦7.08; 0.35≦(R3+R4) / (R3-R4)≦1.85; 0.02≦d3 / TTL≦0.17

7. the object side surface of the third lens is a paraxially convex surface; 2. The photographic optical lens according to claim 1, wherein the following relational expression is satisfied, where f3 is a focal length of the third lens, R5 is a central radius of curvature of an object side surface of the third lens, R6 is a central radius of curvature of an image side surface of the third lens, and TTL is a total optical length of the photographic optical lens. 0.96≦f3 / f≦4.57; -2.07≦(R5+R6) / (R5-R6)≦-0.67; 0.02≦d5 / TTL≦0.08

8. the object side surface of the fourth lens is a paraxially convex surface, and the image side surface of the fourth lens is a paraxially concave surface; 2. The photographic optical lens according to claim 1, wherein the following relational expression is satisfied, where f4 is a focal length of the fourth lens, d7 is an axial thickness of the fourth lens, and TTL is a total optical length of the photographic optical lens. −9.49≦f4 / f≦−1.67; 0.01≦d7 / TTL≦0.05

9. the object side surface of the fifth lens is a paraxially convex surface, and the image side surface of the fifth lens is a paraxially convex surface, 2. The photographic optical lens according to claim 1, wherein the following relational expression is satisfied, where R9 is a central radius of curvature of an object-side surface of the fifth lens, R10 is a central radius of curvature of an image-side surface of the fifth lens, d9 is an axial thickness of the fifth lens, and TTL is a total optical length of the photographic optical lens. 0.04≦(R9+R10) / (R9-R10)≦0.40; 0.04≦d9 / TTL≦0.19

10. the object side surface of the sixth lens is a paraxially convex surface, and the image side surface of the sixth lens is a paraxially concave surface; 2. The photographic optical lens according to claim 1, wherein the following relational expression is satisfied, where f6 is a focal length of the sixth lens, R11 is a central radius of curvature of an object-side surface of the sixth lens, R12 is a central radius of curvature of an image-side surface of the sixth lens, d11 is an axial thickness of the sixth lens, and TTL is a total optical length of the photographic optical lens. −8.36≦f6 / f≦−1.42; 1.29≦(R11+R12) / (R11-R12)≦8.65; 0.01≦d11 / TTL≦0.06

11. the object side surface of the seventh lens is a paraxially convex surface, and its image side surface is a paraxially concave surface; 2. The photographic optical lens according to claim 1, wherein the following relational expression is satisfied, where R13 is a central radius of curvature of an object-side surface of the seventh lens, R14 is a central radius of curvature of an image-side surface of the seventh lens, d13 is an axial thickness of the seventh lens, and TTL is a total optical length of the photographic optical lens. 7.44≦(R13+R14) / (R13-R14)≦84.93; 0.04≦d13 / TTL≦0.21

12. 2. The photographic optical lens according to claim 1, wherein the aperture value FNO of the photographic optical lens is 2.27 or less.

13. 2. The photographic optical lens according to claim 1, wherein the field of view FOV of the photographic optical lens is 93[deg.] or more.

14. 2. The photographic optical lens according to claim 1, wherein the first lens is made of glass.

15. 2. The photographic optical lens according to claim 1, wherein the fifth lens is made of glass.

Images