Image capturing optical lens

Abstract

To provide an image capturing optical lens related to an optical lens field.SOLUTION: An image capturing lens consists of a first lens having negative refractive power, a second lens having negative refractive power, a third lens having positive refractive power, a fourth lens having negative refractive power, and a fifth lens having positive refractive power arranged in order from the object side to the image side, the first lens being made of a glass material, and satisfies the following relational expressions: 1.70≤n1≤2.10, 3.20≤(R3+R4) / (R3-R4)≤4.70, 3.00≤f3 / f≤5.00, when a refractive index of the first lens is defined as n1, a central curvature radius of an object-side surface of the second lens is defined as R3, a central curvature radius of an image-side surface of the second lens is defined as R4, a focal distance of the third lens is defined as f3, and a focal distance of the image capturing optical lens is defined as f.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] In recent years, with the rise of various smart devices, the demand for miniaturized imaging optical lenses is increasing. In addition to the reduction in pixel size of the photosensitive element, current electronic products tend to develop with high functionality and lightweight, thin and portable appearance, so that miniaturized imaging optical lenses with good imaging quality have become 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, when the pixel area of ​​the photosensitive element is shrinking and the system requirements for imaging quality are increasing, a five-lens structure is gradually appearing in the lens design. The demand for wide-angle imaging lenses with excellent optical properties, small volume and sufficient correction of aberration is becoming urgent. 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 optical performance and satisfies design requirements for a large aperture, an extremely thin lens, and an ultra-wide angle lens. [Means for solving the problem]

[0004] In order to solve the above technical problems, an embodiment of the present invention provides an imaging optical lens, which is composed of, in order from the object side to the image side, a first lens having negative refractive power, a second lens having negative refractive power, a third lens having positive refractive power, a fourth lens having negative refractive power, and a fifth lens having positive refractive power, wherein the first lens is made of a glass material, and satisfies the following relational expressions (1) to (3), where n1 is a refractive index of the first 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, f3 is a focal length of the third lens, and f is a focal length of the imaging optical lens. 1.70≦n1≦2.10 (1) 3.20≦(R3+R4) / (R3-R4)≦4.70 (2) 3.00≦f3 / f≦5.00 (3)

[0005] Preferably, when the axial thickness of the fourth lens is d7, the axial thickness of the fifth lens is d9, and the axial distance from the image side surface of the third lens to the object side surface of the fourth lens is d6, the following relational expression (4) is satisfied. 1.00≦(d7+d9) / d6≦2.50 (4)

[0006] Preferably, when the composite focal length of the fourth lens and the fifth lens is f45, the following relational expression (5) is satisfied. 2.10≦f45 / f≦4.00 (5)

[0007] Preferably, when the optical length of the imaging optical lens is TTL, the following relational expression (6) is satisfied. 8.00≦TTL / f≦12.00 (6)

[0008] Preferably, the object side surface of the first lens is a convex surface paraxially, the image side surface of the first lens is a concave surface paraxially, and 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 optical length of the imaging optical lens is TTL, the following relational expressions (7) to (9) are satisfied. -7.82≦f1 / f≦-2.30 (7) 0.81≦(R1+R2) / (R1-R2)≦2.63 (8) 0.00≦d1 / TTL≦0.15 (9)

[0009] Preferably, the object side surface of the second lens is a convex surface paraxially, the image side surface of the second lens is a concave surface paraxially, and when the focal length of the second lens is f2, the axial thickness of the second lens is d3, and the optical length of the imaging optical lens is TTL, the following relational expressions (10) to (11) are satisfied. -20.66≦f2 / f≦-2.89 (10) 0.02≦d3 / TTL≦0.13 (11)

[0010] Preferably, the object side surface of the third lens is a concave surface paraxially, the image side surface of the third lens is a convex surface paraxially, and when 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, an axial thickness of the third lens is d5, and an optical length of the imaging optical lens is TTL, the following relational expressions (12) to (13) are satisfied. 0.83≦(R5+R6) / (R5-R6)≦2.98 (12) 0.04≦d5 / TTL≦0.18 (13)

[0011] Preferably, the object side surface of the fourth lens is a convex surface paraxially, the image side surface of the fourth lens is a concave surface paraxially, and when a focal length of the fourth lens is f4, a central radius of curvature of the object side surface of the fourth lens is R7, a central radius of curvature of the image side surface of the fourth lens is R8, an axial thickness of the fourth lens is d7, and an optical length of the imaging optical lens is TTL, the following relational expressions (14) to (16) are satisfied. -9.83≦f4 / f≦-1.83 (14) 1.00≦(R7+R8) / (R7-R8)≦3.74 (15) 0.02≦d7 / TTL≦0.10 (16)

[0012] Preferably, the object side surface of the fifth lens is a convex surface paraxially, the image side surface of the fifth lens is a convex surface paraxially, and when a focal length of the fifth lens is f5, a central radius of curvature of the object side surface of the fifth lens is R9, a central radius of curvature of the image side surface of the fifth lens is R10, an axial thickness of the fifth lens is d9, and an optical length of the imaging optical lens is TTL, the following relational expressions (17) to (19) are satisfied. 0.66≦f5 / f≦3.20 (17) -0.40≦(R9+R10) / (R9-R10)≦-0.02 (18) 0.06≦d9 / TTL≦0.22 (19)

[0013] Preferably, when the angle of view in the diagonal direction of the imaging optical lens is taken as FOV, the following relational expression (20) is satisfied. FOV≧194° (20) Effect of the Invention

[0014] The imaging optical lens according to the present invention has excellent optical properties, as well as the properties of a large aperture, an extremely thin structure, and an ultra-wide angle, and is particularly applicable to imaging lens assemblies for mobile phones that are composed of imaging elements such as high-pixel CCDs and CMOSs, web imaging lenses, and imaging lenses for drones.

[0015] In order to more clearly describe the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. It is obvious that the drawings described below are only some embodiments of the present invention. Those skilled in the art can further obtain other drawings based on these drawings without any creative work, and the specific contents are as follows: [Brief description of the drawings]

[0016] [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. [Figure 17] FIG. 13 is a schematic diagram showing the configuration of an imaging optical lens according to a fifth embodiment of the present invention. [Figure 18] 18 is a schematic diagram showing the longitudinal chromatic aberration of the imaging optical lens shown in FIG. 17. [Figure 19] 18 is a schematic diagram showing chromatic aberration of magnification of the imaging optical lens shown in FIG. 17. [Figure 20] 18A to 18C are schematic diagrams showing the field curvature and distortion of the imaging optical lens shown in FIG. 17. [Figure 21] FIG. 13 is a schematic diagram showing the configuration of an imaging optical lens according to a sixth embodiment of the present invention. [Figure 22] 22 is a schematic diagram showing the longitudinal chromatic aberration of the imaging optical lens shown in FIG. 21. [Diagram 23] 22 is a schematic diagram showing chromatic aberration of magnification of the imaging optical lens shown in FIG. 21. [Figure 24] 22A to 22C are schematic diagrams showing the field curvature and distortion of the imaging optical lens shown in FIG. 21. [Diagram 25] FIG. 13 is a schematic diagram showing a configuration of an imaging optical lens according to a comparative embodiment. [Figure 26] FIG. 26 is a schematic diagram showing the longitudinal chromatic aberration of the imaging optical lens shown in FIG. [Figure 27] 26 is a schematic diagram showing chromatic aberration of magnification of the imaging optical lens shown in FIG. 25. [Figure 28] 26 is a schematic diagram showing the field curvature and distortion of the imaging optical lens shown in FIG. 25. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] In order to make the objectives, solutions and advantages of the present invention clearer, the following describes in detail the embodiments of the present invention with reference to the drawings. It can be understood by those skilled in the art that many technical details are described in the embodiments of the present invention to better understand the present invention. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solution claimed by the present invention can be realized.

[0018] (First embodiment) As shown in the drawings, the present invention provides an imaging optical lens 10. Fig. 1 shows an imaging optical lens 10 according to a first embodiment of the present invention, which includes a total of five lenses. Specifically, the imaging optical lens 10 is composed of, in order from the object side to the image side, a first lens L1, a second lens L2, a third lens L3, a diaphragm S1, a fourth lens L4, and a fifth lens L5. An optical element such as an optical filter GF may be provided between the fifth lens L5 and an image plane Si.

[0019] In this embodiment, the first lens L1 is made of glass material, the second lens L2 is made of plastic material, the third lens L3 is made of plastic material, the fourth lens L4 is made of plastic material, and the fifth lens L5 is made of plastic material, and by appropriately selecting the glass lenses, the optical performance of the imaging optical lens can be improved, and the system can operate stably at extremely cold and hot operating temperatures, and ensure excellent imaging quality. In other optional embodiments, each lens may be made of other materials.

[0020] The object side and image side surfaces of the first lens L1 are both spherical, and the remaining lenses are all aspheric lenses. By designing the surfaces of some of the lenses to be spherical, manufacturing difficulty can be reduced.

[0021] When the refractive index of the first lens L1 is n1, the relational expression 1.70≦n1≦2.10 is satisfied, which specifies the range of the refractive index n1 of the first lens L1 and, within the range of the conditional expression, contributes to a reduction in the tip aperture of the imaging optical lens and an improvement in imaging quality.

[0022] When the central radius of curvature of the object side surface of the second lens L2 is R3 and the central radius of curvature of the image side surface of the second lens L2 is R4, the relational expression 3.20≦(R3+R4) / (R3-R4)≦4.70 is satisfied, which specifies the shape of the second lens L2 and, within the range of the conditional expression, is advantageous for mitigating wide-angle light rays and reducing chromatic aberration, thereby setting the chromatic aberration to |LC|≦9 μm.

[0023] When the focal length of the third lens L4 is f3 and the focal length of the imaging optical lens 10 is f, the relational formula 3.00≦f3 / f≦5.00 is satisfied, the ratio between the focal length f3 of the third lens L3 and the focal length f of the imaging optical lens 10 is specified, and the power of the system is reasonably distributed, so that the system has excellent imaging quality and low sensitivity.

[0024] When the axial thickness of the fourth lens L4 is d7, the axial thickness of the fifth lens L5 is d9, and the axial distance from the image side surface of the third lens L3 to the object side surface of the fourth lens L4 is d6, the relational expression 1.00≦(d7+d9) / d6≦2.50 is satisfied, the ratio of the axial thickness d7 of the fourth lens L4 and the axial thickness d9 of the fifth lens L5 to the axial distance d6 of the third lens L3 and the fourth lens L4 is specified, and the difficulty of assembly in the actual production process can be effectively reduced within the range of the conditional expression.

[0025] When the composite focal length of the fourth lens L4 and the fifth lens L5 is f45 and the focal length of the imaging optical lens 10 is f, the relational expression 2.10≦f45 / f≦4.00 is satisfied, the ratio of the composite focal length f45 of the two cemented lenses made up of the fourth lens L4 and the fifth lens L5 to the focal length f of the imaging optical lens 10 is specified, and within the range of the conditional expression, the amount of field curvature of the system can be effectively balanced and the shift amount of the field curvature of the central field can be made smaller than 0.01 mm.

[0026] When the optical length of the imaging optical lens 10 is TTL and the focal length of the imaging optical lens 10 is f, the relational expression 8.00≦TTL / f≦12.00 is satisfied, which specifies the ratio between the optical length TTL and the focal length f of the imaging optical lens 10 and is advantageous for miniaturization within the range of the conditional expression.

[0027] In this embodiment, the object side surface of the first lens L1 is a paraxial convex surface, and the image side surface of the first lens L1 is a paraxial concave surface, and the first lens L1 has a negative refractive power. In other optional embodiments, the object side surface and the image side surface of the first lens L1 may be arranged in other concave and convex distribution patterns.

[0028] When the focal length of the first lens L1 is f1, the relational expression -7.82≦f1 / f≦-2.30 is satisfied, which defines the ratio between the focal length f1 of the first lens L1 and the focal length f of the imaging optical lens 10, and contributes to realizing an ultra-wide angle within this range. Preferably, the relational expression -4.89≦f1 / f≦-2.87 is satisfied.

[0029] When the radius of curvature of the center of the object side surface of the first lens L1 is R1 and the radius of curvature of the center of the image side surface of the first lens L2 is R2, the relational expression 0.81≦(R1+R2) / (R1-R2)≦2.63 is satisfied, the shape of the first lens L1 is defined, and within this range, it contributes to realizing an ultra-wide angle. Preferably, the relational expression 1.30≦(R1+R2) / (R1-R2)≦2.11 is satisfied.

[0030] When the axial thickness of the first lens L1 is d1 and the optical length of the imaging optical lens 10 is TTL, the relational expression 0.00≦d1 / TTL≦0.15 is satisfied, which is advantageous for realizing compactness within the range of the conditional expression. Preferably, the relational expression 0.00≦d1 / TTL≦0.12 is satisfied.

[0031] In this embodiment, the object side surface of the second lens L2 is a paraxial convex surface, and the image side surface of the second lens L2 is a paraxial concave surface, and the second lens L2 has a negative refractive power. In other optional embodiments, the object side surface and the image side surface of the second lens L2 may be arranged in other concave and convex distribution patterns.

[0032] In this embodiment, when the focal length of the imaging optical lens 10 is f and the focal length of the second lens L2 is f2, the relational expression -20.66≦f2 / f≦-2.89 is satisfied, the ratio of the focal length f2 of the second lens L2 to the focal length of the imaging optical lens 10 is specified, and within this range, the amount of field curvature of the system can be effectively balanced. Preferably, the relational expression -12.91≦f2 / f≦-3.61 is satisfied.

[0033] When the axial thickness of the second lens L2 is d3 and the optical length of the imaging optical lens 10 is TTL, the relational expression 0.02≦d3 / TTL≦0.13 is satisfied, which is advantageous for realizing compactness within the range of the conditional expression. Preferably, the relation 0.03≦d3 / TTL≦0.10 is satisfied.

[0034] In this embodiment, the object side surface of the third lens L3 is a paraxial concave surface, and the image side surface of the third lens L3 is a paraxial convex surface, and the third lens L3 has a positive refractive power. In other optional embodiments, the object side surface and the image side surface of the third lens L3 may be arranged in other concave and convex distribution patterns.

[0035] When the radius of curvature of the center of the object side surface of the third lens L3 is R5 and the radius of curvature of the center of the image side surface of the third lens L3 is R6, the relational expression 0.83≦(R5+R6) / (R5-R6)≦2.98 is satisfied, the shape of the third lens L3 is specified, and within this range, the degree of deflection of light rays can be reduced and chromatic aberration can be effectively corrected. Preferably, the relational expression 1.34≦(R5+R6) / (R5-R6)≦2.38 is satisfied.

[0036] When the axial thickness of the third lens L3 is d5 and the optical length of the imaging optical lens 10 is TTL, the relational expression 0.04≦d5 / TTL≦0.18 is satisfied, which is advantageous for realizing compactness within the range of the conditional expression. Preferably, the relational expression 0.06≦d5 / TTL≦0.15 is satisfied.

[0037] In this embodiment, the fourth lens L4 has a paraxially convex object side surface and a paraxially concave image side 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 be arranged in other concave and convex distribution patterns.

[0038] When the focal length of the imaging optical lens 10 is f and the focal length of the fourth lens L4 is f4, the relationship -9.83≦f4 / f≦-1.83 is satisfied, and the system has excellent imaging quality and low sensitivity due to the reasonable distribution of power, and preferably -6.14≦f4 / f≦-2.29 is satisfied.

[0039] When the radius of curvature of the center of the object side surface of the fourth lens L4 is R7 and the radius of curvature of the center of the image side surface of the fourth lens L4 is R8, the relational expression 1.00≦(R7+R8) / (R7-R8)≦3.74 is satisfied, which defines the shape of the fourth lens L4, and within this range, as the lens becomes ultra-thin and wide-angle, it is advantageous for correcting aberrations of off-axis angles of view, etc. Preferably, the relational expression 1.60≦(R7+R8) / (R7-R8)≦2.99 is satisfied.

[0040] When the axial thickness of the fourth lens L4 is d7 and the optical length of the imaging optical lens 10 is TTL, the relational expression 0.02≦d7 / TTL≦0.10 is satisfied, which is advantageous for realizing compactness within the range of the conditional expression. Preferably, the relational expression 0.03≦d7 / TTL≦0.08 is satisfied.

[0041] In this embodiment, the object side surface of the fifth lens L5 is a paraxial convex surface, and the image side surface of the fifth lens L5 is a paraxial convex surface, and the fifth lens L5 has a positive refractive power. In other optional embodiments, the object side surface and the image side surface of the fifth lens L5 may be arranged in other concave and convex distribution patterns.

[0042] When the focal length of the imaging optical lens 10 is f and the focal length of the fifth lens L5 is f5, the relational expression 0.66≦f5 / f≦3.20 is satisfied, and by limiting the fifth lens L5, the light ray angle of the imaging optical lens 10 can be effectively made gentle and the tolerance sensitivity can be reduced. Preferably, the relational expression 1.05≦f5 / f≦2.56 is satisfied.

[0043] When the radius of curvature of the center of the object side surface of the fifth lens L5 is R9 and the radius of curvature of the center of the image side surface of the fifth lens L5 is R10, the relational expression -0.40≦(R9+R10) / (R9-R10)≦-0.02 is satisfied, which defines the shape of the fifth lens, and within this range, as the lens becomes ultra-thin and wide-angle, it is advantageous for correcting aberrations of off-axis angles of view, etc. Preferably, the relational expression -0.25≦(R9+R10) / (R9-R10)≦-0.03 is satisfied.

[0044] When the axial thickness of the fifth lens L5 is d9 and the optical length of the imaging optical lens 10 is TTL, the relational expression 0.06≦d9 / TTL≦0.22 is satisfied, which is advantageous for realizing compactness within the range of the conditional expression. Preferably, the relational expression 0.09≦d9 / TTL≦0.17 is satisfied.

[0045] In this embodiment, when the angle of view in the diagonal direction of the imaging optical lens 10 is taken as FOV, the relational expression FOV≧194° is satisfied, which is advantageous in realizing a wide angle.

[0046] In this embodiment, when the image height of the imaging optical lens 10 is IH and the optical length of the imaging optical lens 10 is TTL, the relation TTL / IH≦6.08 is satisfied, which is advantageous for realizing compactness. Preferably, the relation TTL / IH≦5.91 is satisfied.

[0047] In this embodiment, the aperture value FNO of the imaging optical lens 10 is 1.80 or less, which allows for a large aperture and excellent imaging performance of the imaging optical lens.

[0048] The imaging optical lens 10 has good optical performance and can meet the design requirements of large aperture, ultra-thinness, and ultra-wide angle. Based on the characteristics of the imaging optical lens 10, the imaging optical lens 10 is particularly applicable to imaging lens assemblies of mobile phones configured with imaging elements such as CCD and CMOS for high pixels, WEB imaging lenses, and imaging lenses for drones.

[0049] The imaging optical lens 10 of the present invention will be described below using examples. The symbols used in each example indicate the following: The focal length, axial distance, central radius of curvature, axial thickness, inflection point position, and stationary point position are all in mm.

[0050] TTL: Optical length (the axial distance from the object side of the first lens L1 to the image plane Si) in mm. Aperture No. FNO: The ratio between the effective focal length of an imaging optical lens and the entrance pupil diameter.

[0051] Preferably, in order to meet the demand for high quality imaging, an inflection point and / or a stationary point may be further set on the object side and / or image side of the lens, and a specific embodiment is given below.

[0052] 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] The meanings of the symbols in the table are 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 of the first lens L1 R2: Radius of curvature of the center of the image side of the first lens L1 R3: The central radius of curvature of the object side of the second lens L2 R4: Radius of curvature of the center of the image side of the second lens L2 R5: The central radius of curvature of the object side of the third lens L3 R6: The central radius of curvature of the image side of the third lens L3 R7: The central radius of curvature of the object side of the fourth lens L4 R8: The central radius of curvature of the image side of the fourth lens L4 R9: The central radius of curvature of the object side of the fifth lens L5 R10: Radius of central curvature of the image side of the fifth lens L5 R11: The central curvature radius of the object side of the optical filter GF R12: Radius of curvature of the center of the image side of the optical filter GF d: Axial thickness of lens, axial distance between lenses d0: The axial distance from the aperture S1 to the object side of the third lens L3 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 optical filter GF d11: On-axis thickness of optical filter GF d12: 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 d line of the first lens L1 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 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 vg: Abbe number of the optical filter GF

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

[0056] [Table 2]

[0057] For convenience, the aspheric surface of each lens surface is expressed by the following formula (21): However, the present invention is not particularly limited to the aspheric polynomial of formula (21).

[0058] 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 (twenty one)

[0059] where k is a conic coefficient, A4, A6, A8, A10, A12, A14, A16, A18, and A20 are aspheric coefficients, c is the curvature at the center of the optical surface, r is the perpendicular distance between a point on the aspheric curve and the optical axis, and z is the aspheric depth (the perpendicular distance between a point on the aspheric surface that is at a distance r from the optical axis and a tangent plane that is tangent to the vertex of the aspheric surface on the optical axis).

[0060] Tables 3 and 4 show design data of the inflection points and stationary points of each lens in the imaging optical lens 10 according to the first embodiment of the present invention. Here, P1R1 and P1R2 indicate the object side surface and the image side surface of the first lens L1, P2R1 and P2R2 indicate the object side surface and the image side surface of the second lens L2, P3R1 and P3R2 indicate the object side surface and the image side surface of the third lens L3, P4R1 and P4R2 indicate the object side surface and the image side surface of the fourth lens L4, and P5R1 and P5R2 indicate the object side surface and the image side surface of the fifth lens L5. The corresponding data in the "inflection point position" column is the vertical distance from the inflection point on the surface of each lens to the optical axis of the imaging optical lens 10. The corresponding data in the "stationary point position" column is the vertical distance from the stationary point on the surface of each lens to the optical axis of the imaging optical lens 10.

[0061] [Table 3]

[0062] [Table 4]

[0063] Fig. 2 and Fig. 3 are schematic diagrams showing the axial chromatic aberration and lateral chromatic aberration of light having wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm 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 555 nm after passing through the imaging optical lens 10 according to the first embodiment, where the field curvature S in Fig. 4 is the field curvature in the sagittal direction and T is the field curvature in the tangential direction.

[0064] Table 29 described later shows various numerical values ​​in each embodiment and values ​​corresponding to parameters defined by conditional expressions.

[0065] As shown in Table 29, the first embodiment satisfies each of the conditional expressions.

[0066] In this embodiment, the imaging optical lens 10 has an entrance pupil diameter ENPD of 0.463 mm, a full field of view image height IH of 1.382 mm, and a diagonal angle of view FOV of 194.00°. The imaging optical lens 10 satisfies the design requirements for a large aperture, ultra-thin design, and ultra-wide angle, and has excellent optical characteristics.

[0067] Second embodiment The second embodiment is basically the same as the first embodiment, and the symbols have the same meanings as in the first embodiment, so only the differences will be described below.

[0068] FIG. 5 shows an imaging optical lens 20 according to a second embodiment of the present invention.

[0069] Tables 5 and 6 show design data for the imaging optical lens 20 according to the second embodiment of the present invention.

[0070] [Table 5]

[0071] Table 6 shows the aspheric data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.

[0072] [Table 6]

[0073] Tables 7 and 8 show design data for the inflection points and stationary points of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.

[0074] [Table 7]

[0075] [Table 8]

[0076] Fig. 6 and Fig. 7 are schematic diagrams showing the axial chromatic aberration and lateral chromatic aberration of light having wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm after passing through the imaging optical lens 20 according to the second embodiment. Fig. 8 is a schematic diagram showing the field curvature and distortion aberration of light having a wavelength of 555 nm after passing 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.

[0077] As shown in Table 29, the second embodiment satisfies each of the conditional expressions.

[0078] In this embodiment, the entrance pupil diameter ENPD of the imaging optical lens 20 is 0.548 mm, the full field of view image height IH is 1.382 mm, and the diagonal field of view FOV is 194.00°. The imaging optical lens 20 satisfies the design requirements for a large aperture, ultra-thin size, and ultra-wide angle, and has excellent optical characteristics.

[0079] Third embodiment The third embodiment is basically the same as the first embodiment, and the symbols have the same meanings as in the first embodiment, so only the differences will be described below.

[0080] FIG. 9 shows an imaging optical lens 30 according to a third embodiment of the present invention.

[0081] Tables 9 and 10 show design data for the imaging optical lens 30 according to the third embodiment of the present invention.

[0082] [Table 9]

[0083] Table 10 shows the aspheric data of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.

[0084] [Table 10]

[0085] Tables 11 and 12 show design data for the inflection points and stationary points of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.

[0086] [Table 11]

[0087] [Table 12]

[0088] Fig. 10 and Fig. 11 are schematic diagrams showing the axial chromatic aberration and the chromatic aberration of magnification after light of wavelengths 470 nm, 510 nm, 555 nm, 610 nm, and 650 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 555 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.

[0089] In the following Table 29, numerical values ​​corresponding to each conditional expression in this embodiment are listed in accordance with the above conditional expressions. Obviously, the imaging optical lens 30 of this embodiment satisfies the above conditional expressions.

[0090] In this embodiment, the imaging optical lens 30 has an entrance pupil diameter ENPD of 0.356 mm, a full field of view image height IH of 1.382 mm, and a diagonal angle of view FOV of 194.00°. The imaging optical lens 30 satisfies the design requirements for a large aperture, ultra-thin design, and ultra-wide angle, and has excellent optical characteristics.

[0091] (Fourth embodiment) The fourth embodiment is basically the same as the first embodiment, and the symbols have the same meanings as in the first embodiment, so only the differences will be described below.

[0092] FIG. 13 shows an imaging optical lens 40 according to a fourth embodiment of the present invention.

[0093] Tables 13 and 14 show design data for the imaging optical lens 40 according to the fourth embodiment of the present invention.

[0094] [Table 13]

[0095] Table 14 shows the aspheric data of each lens in the imaging optical lens 40 according to the fourth embodiment of the present invention.

[0096] [Table 14]

[0097] Tables 15 and 16 show design data for the inflection points and stationary points of each lens in the imaging optical lens 40 according to the fourth embodiment of the present invention.

[0098] [Table 15]

[0099] [Table 16]

[0100] Fig. 14 and Fig. 15 are schematic diagrams showing the axial chromatic aberration and the chromatic aberration of magnification after light having wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, and 650 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 555 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.

[0101] In the following Table 29, numerical values ​​corresponding to each conditional expression in this embodiment are listed in accordance with the above conditional expressions. Obviously, the imaging optical lens 40 of this embodiment satisfies the above conditional expressions.

[0102] In this embodiment, the imaging optical lens 40 has an entrance pupil diameter ENPD of 0.542 mm, a full field of view image height IH of 1.613 mm, and a diagonal angle of view FOV of 194.00°. The imaging optical lens 40 satisfies the design requirements for a large diameter, an extremely thin structure, and an ultra-wide angle, and has excellent optical characteristics.

[0103] Fifth embodiment The fifth embodiment is basically the same as the first embodiment, and the symbols have the same meanings as in the first embodiment, so only the differences will be described below.

[0104] FIG. 17 shows an imaging optical lens 50 according to a fifth embodiment of the present invention.

[0105] Tables 17 and 18 show design data for the imaging optical lens 50 according to the fifth embodiment of the present invention.

[0106] [Table 17]

[0107] Table 18 shows the aspheric data of each lens in the imaging optical lens 50 according to the fifth embodiment of the present invention.

[0108] [Table 18]

[0109] Tables 19 and 20 show design data for the inflection points and stationary points of each lens in the imaging optical lens 50 according to the fifth embodiment of the present invention.

[0110] [Table 19]

[0111] [Table 20]

[0112] Fig. 18 and Fig. 19 are schematic diagrams showing the axial chromatic aberration and the chromatic aberration of magnification after light having wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm has passed through the imaging optical lens 50 according to the fifth embodiment. Fig. 20 is a schematic diagram showing the field curvature and the distortion aberration after light having wavelength of 555 nm has passed through the imaging optical lens 50 according to the fifth embodiment. The field curvature S in Fig. 20 is the field curvature in the sagittal direction, and T is the field curvature in the tangential direction.

[0113] In the following Table 29, numerical values ​​corresponding to each conditional expression in this embodiment are listed in accordance with the above conditional expressions. Obviously, the imaging optical lens 50 of this embodiment satisfies the above conditional expressions.

[0114] In this embodiment, the imaging optical lens 50 has an entrance pupil diameter ENPD of 0.369 mm, a full field of view image height IH of 1.460 mm, and a diagonal angle of view FOV of 194.00°. The imaging optical lens 50 satisfies the design requirements for a large aperture, ultra-thin design, and ultra-wide angle, and has excellent optical characteristics.

[0115] Sixth embodiment The sixth embodiment is basically the same as the first embodiment, and the symbols have the same meanings as in the first embodiment, so only the differences will be described below.

[0116] FIG. 21 shows an imaging optical lens 60 according to a fourth embodiment of the present invention.

[0117] Tables 21 and 22 show design data for the imaging optical lens 60 according to the sixth embodiment of the present invention.

[0118] [Table 21]

[0119] Table 22 shows the aspheric data of each lens in the imaging optical lens 60 according to the sixth embodiment of the present invention.

[0120] [Table 22]

[0121] Tables 23 and 24 show design data for the inflection points and stationary points of each lens in the imaging optical lens 60 according to the sixth embodiment of the present invention.

[0122] [Table 23]

[0123] [Table 24]

[0124] Fig. 22 and Fig. 23 are schematic diagrams showing the axial chromatic aberration and the chromatic aberration of magnification after light having wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm has passed through the imaging optical lens 60 according to the sixth embodiment. Fig. 24 is a schematic diagram showing the field curvature and distortion aberration after light having wavelength of 555 nm has passed through the imaging optical lens 60 according to the sixth embodiment. The field curvature S in Fig. 24 is the field curvature in the sagittal direction, and T is the field curvature in the tangential direction.

[0125] In the following Table 29, numerical values ​​corresponding to each conditional expression in this embodiment are listed in accordance with the above conditional expressions. Obviously, the imaging optical lens 60 of this embodiment satisfies the above conditional expressions.

[0126] In this embodiment, the imaging optical lens 60 has an entrance pupil diameter ENPD of 0.546 mm, a full field of view image height IH of 1.472 mm, and a diagonal angle of view FOV of 194.00°. The imaging optical lens 60 satisfies the design requirements for a large aperture, ultra-thin design, and ultra-wide angle, and has excellent optical characteristics.

[0127] (Comparative embodiment) The meanings of the symbols in the comparative embodiment are the same as those in the first embodiment, so only the differences are shown below.

[0128] FIG. 25 shows an imaging optical lens 70 according to a comparative embodiment.

[0129] Tables 25 and 26 show design data for the imaging optical lens 70 according to the comparative embodiment.

[0130] [Table 25]

[0131] Table 26 shows the aspheric data of each lens in the imaging optical lens 70 according to the comparative embodiment.

[0132] [Table 26]

[0133] Tables 27 and 28 show the design data of the inflection points and stationary points of each lens in the imaging optical lens 70 according to the comparative embodiment.

[0134] [Table 27]

[0135] [Table 28]

[0136] Fig. 26 and Fig. 27 are schematic diagrams showing the axial chromatic aberration and the chromatic aberration of magnification after light of wavelengths 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm has passed through the imaging optical lens 70 according to the comparative embodiment. Fig. 28 is a schematic diagram showing the field curvature and the distortion aberration after light of wavelength 555 nm has passed through the imaging optical lens 70 according to the comparative embodiment. The field curvature S in Fig. 28 is the field curvature in the sagittal direction, and T is the field curvature in the tangential direction.

[0137] In Table 29 below, numerical values ​​corresponding to each condition in the comparative embodiment are given according to the above condition. In the imaging optical lens 70 according to the comparative embodiment, (R3+R4) / (R3-R4)=3.00, and the relation 3.20≦(R3+R4) / (R3-R4)≦4.70 is not satisfied.

[0138] In the comparative embodiment, the entrance pupil diameter ENPD of the imaging optical lens 70 is 0.414 mm, the full field of view image height IH is 1.480 mm, and the diagonal field of view FOV is 194.00°, and the on-axis and off-axis chromatic aberrations of the imaging optical lens 70 are not sufficiently corrected.

[0139] [Table 29]

[0140] 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, in order from the object side to the image side, of a first lens having negative refractive power, a second lens having negative refractive power, a third lens having positive refractive power, a fourth lens having negative refractive power, and a fifth lens having positive refractive power, the first lens being made of a glass material; an imaging optical lens, characterized in that the following relational expressions (1) to (3) are satisfied, when a refractive index of the first lens is n1, a central radius of curvature of the object side surface of the second lens is R3, a central radius of curvature of the image side surface of the second lens is R4, a focal length of the third lens is f3, and a focal length of the imaging optical lens is f: 1.70≦n1≦2.10 (1) 3.20≦(R3+R4) / (R3-R4)≦4.70 (2) 3.00≦f3 / f≦5.00 (3)

2. 2. The imaging optical lens according to claim 1, wherein when an axial thickness of the fourth lens is d7, an axial thickness of the fifth lens is d9, and an axial distance from an image side surface of the third lens to an object side surface of the fourth lens is d6, the following relational expression (4) is satisfied: 1.00≦(d7+d9) / d6≦2.50 (4)

3. 2. The imaging optical lens according to claim 1, wherein when a composite focal length of the fourth lens and the fifth lens is f45, the following relational expression (5) is satisfied: 2.10≦f45 / f≦4.00 (5)

4. 2. The imaging optical lens according to claim 1, wherein the following relational expression (6) is satisfied, where TTL is an optical length of the imaging optical lens: 8.00≦TTL / f≦12.00 (6)

5. an object side surface of the first lens is a paraxially convex surface, and an image side surface of the first lens is a paraxially concave surface, the imaging optical lens according to claim 1, wherein the following relational expressions (7) to (9) are satisfied when a focal length of the first lens is f1, a central radius of curvature of an object side surface of the first lens is R1, a central radius of curvature of an image side surface of the first lens is R2, an axial thickness of the first lens is d1, and an optical length of the imaging optical lens is TTL: −7.82≦f1 / f≦−2.30 (7) 0.81≦(R1+R2) / (R1-R2)≦2.63 (8) 0.00≦d1 / TTL≦0.15 (9)

6. an object side surface of the second lens is a paraxially convex surface, and an image side surface of the second lens is a paraxially concave surface; 2. The imaging optical lens according to claim 1, wherein the following relational expressions (10) to (11) are satisfied, where f2 is a focal length of the second lens, d3 is an axial thickness of the second lens, and TTL is an optical length of the imaging optical lens. −20.66≦f2 / f≦−2.89 (10) 0.02≦d3 / TTL≦0.13 (11)

7. an object side surface of the third lens is a paraxially concave surface, and an image side surface of the third lens is a paraxially convex surface, the imaging optical lens according to claim 1, wherein the following relational expressions (12) to (13) are satisfied when a central radius of curvature of an object side surface of the third lens is R5, a central radius of curvature of an image side surface of the third lens is R6, an axial thickness of the third lens is d5, and an optical length of the imaging optical lens is TTL. 0.83≦(R5+R6) / (R5-R6)≦2.98 (12) 0.04≦d5 / TTL≦0.18 (13)

8. an object side surface of the fourth lens is a paraxially convex surface, and an image side surface of the fourth lens is a paraxially concave surface, the imaging optical lens according to claim 1, wherein the following relational expressions (14) to (16) are satisfied when a focal length of the fourth lens is f4, a central radius of curvature of an object side surface of the fourth lens is R7, a central radius of curvature of an image side surface of the fourth lens is R8, an axial thickness of the fourth lens is d7, and an optical length of the imaging optical lens is TTL. −9.83≦f4 / f≦−1.83 (14) 1.00≦(R7+R8) / (R7-R8)≦3.74 (15) 0.02≦d7 / TTL≦0.10 (16)

9. an object side surface of the fifth lens is a paraxially convex surface, and an image side surface of the fifth lens is a paraxially convex surface, the imaging optical lens according to claim 1, wherein the following relational expressions (17) to (19) are satisfied when a focal length of the fifth lens is f5, a central radius of curvature of an object side surface of the fifth lens is R9, a central radius of curvature of an image side surface of the fifth lens is R10, an axial thickness of the fifth lens is d9, and an optical length of the imaging optical lens is TTL. 0.66≦f5 / f≦3.20 (17) -0.40≦(R9+R10) / (R9-R10)≦-0.02 (18) 0.06≦d9 / TTL≦0.22 (19)

10. 2. The imaging optical lens according to claim 1, wherein the following relational expression (20) is satisfied when a diagonal angle of view of the imaging optical lens is taken as FOV: FOV≧194° (20)

Images