Image capturing optical lens

Abstract

To provide an optical lens, in particular an image capturing optical lens.SOLUTION: An image capturing optical lens provided herein comprises, in order from the object side to the image side, a first lens having positive refractive power, a second lens having negative refractive power, a third lens having negative refractive power, a fourth lens having positive refractive power, a fifth lens having negative refractive power, a sixth lens having positive refractive power, and a seventh lens having negative refractive power, and satisfies the following conditional expressions: -0.300≤Sin(A1.0out14)*R14 / f7≤0.003, 1.05≤(f1+f2+f3+f4) / (f5+f6+f7)≤2.30, -1.40≤Sin(A0.8out8)*R8 / f4≤0.10.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

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

[0003] In view of the above problems, an object of the present invention is to provide an imaging optical lens that has good optical performance, in which aberrations are sufficiently corrected, and that satisfies design requirements such as a large aperture, a wide angle, an extremely thin design, diversification of structural designs, and a high degree of sensor matching. [Means for solving the problem]

[0004] To achieve the above object, the solution of the present invention provides an imaging optical lens, which is composed of a total of seven lenses, which are, in order from the object side to the image side, a first lens having positive refractive power, a second lens having negative refractive power, a third lens having negative refractive power, a fourth lens having positive refractive power, a fifth lens having negative refractive power, a sixth lens having positive refractive power, and a seventh lens having negative refractive power; the first lens has an object-side surface that is convex at the paraxial line and an image-side surface that is concave at the paraxial line, the second lens has an object-side surface that is convex at the paraxial line and an image-side surface that is concave at the paraxial line, the third lens has an object-side surface that is concave at the paraxial line and an image-side surface that is concave at the paraxial line, the fourth lens has an object-side surface that is convex at the paraxial line and an image-side surface that is convex at the paraxial line, the fifth lens has an object-side surface that is convex at the paraxial line and an image-side surface that is concave at the paraxial line, the sixth lens has an object-side surface that is convex at the paraxial line and an image-side surface that is convex at the paraxial line, and the seventh lens has an object-side surface that is convex at the paraxial line and an image-side surface that is concave at the paraxial line, The focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the focal length of the fifth lens is f5, the focal length of the sixth lens is f6, the focal length of the seventh lens is f7, the central radius of curvature of the image side surface of the fourth lens in the paraxial direction is R8, the central radius of curvature of the object side surface of the fifth lens in the paraxial direction is R9, the central radius of curvature of the image side surface of the fifth lens in the paraxial direction is R10, the central radius of curvature of the image side surface of the fifth lens in the paraxial direction is R14, the entrance pupil diameter of the imaging optical lens is ENPD, When the angle of view of a 1.0 field of view of the optical lens is FOV, the axial distance from the image side surface of the first lens to the object side surface of the second lens is d2, the axial distance from the image side surface of the second lens to the object side surface of the third lens is d4, the included angle between the chief ray of a 1.0 field of view of the imaging optical lens and the optical axis when the chief ray emerges from the image side surface of the seventh lens is Sin(A1.0out14), and the included angle between the chief ray of a 0.8x field of view of the imaging optical lens and the optical axis when the chief ray emerges from the image side surface of the fourth lens is Sin(A0.8out8), the following conditional expressions (1) to (7) are satisfied: -1.40≦f3 / f4≦-0.60 (1) 1.20≦R9 / R10≦1.90 (2) 5.10≦ENPD / Tan(FOV / 2)≦5.70 (3) 0.30≦d2 / d4≦0.60 (4) -0.300≦Sin(A1.0out14)*R14 / f7≦0.003 (5) 1.05≦(f1+f2+f3+f4) / (f5+f6+f7)≦2.30 (6) -1.40≦Sin(A0.8out8)*R8 / f4≦0.10 (7)

[0005] Preferably, the following conditional expression (8) is satisfied. 0.30≦d2 / d4≦0.50 (8)

[0006] Preferably, the following conditional expression (9) is satisfied. -0.230≦Sin(A1.0out14)*R14 / f7≦0.003 (9)

[0007] Preferably, the following conditional expression (10) is satisfied. 1.25≦(f1+f2+f3+f4) / (f5+f6+f7)≦2.00 (10)

[0008] Preferably, the following conditional expression (11) is satisfied. -1.20≦Sin(A0.8out8)*R8 / f4≦0.10 (11)

[0009] Preferably, when the axial thickness of the sixth lens is d11, the following conditional expression (12) is satisfied. 9.00≦f6 / d11≦16.00 (12)

[0010] Preferably, the following conditional expression (13) is satisfied. 11.00≦f6 / d11≦14.00 (13)

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

[0012] The solution of the present invention further provides an imaging optical lens, which is composed of a total of seven lenses, which are, in order from the object side to the image side, a first lens having positive refractive power, a second lens having negative refractive power, a third lens having negative refractive power, a fourth lens having positive refractive power, a fifth lens having negative refractive power, a sixth lens having positive refractive power, and a seventh lens having negative refractive power; the first lens has an object-side surface that is convex at the paraxial line and an image-side surface that is concave at the paraxial line, the second lens has an object-side surface that is convex at the paraxial line and an image-side surface that is concave at the paraxial line, the third lens has an object-side surface that is concave at the paraxial line and an image-side surface that is concave at the paraxial line, the fourth lens has an object-side surface that is convex at the paraxial line and an image-side surface that is convex at the paraxial line, the fifth lens has an object-side surface that is convex at the paraxial line and an image-side surface that is concave at the paraxial line, the sixth lens has an object-side surface that is convex at the paraxial line and an image-side surface that is convex at the paraxial line, and the seventh lens has an object-side surface that is convex at the paraxial line and an image-side surface that is concave at the paraxial line, The focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the focal length of the fifth lens is f5, the focal length of the sixth lens is f6, the focal length of the seventh lens is f7, the central radius of curvature of the object side surface of the first lens in the paraxial direction is R1, the central radius of curvature of the image side surface of the second lens in the paraxial direction is R4, the central radius of curvature of the object side surface of the third lens in the paraxial direction is R5, the central radius of curvature of the image side surface of the fourth lens in the paraxial direction is R8, Let R14 be the central radius of curvature at the paraxial center of the image side surface of the imaging optical lens, Sin(A1.0out14) be the included angle between the chief ray of a 1.0 visual field of the imaging optical lens and the optical axis when the chief ray emerges from the image side surface of the seventh lens, Sin(A0.8out8) be the included angle between the chief ray of a 0.8x visual field of the imaging optical lens and the optical axis when the chief ray emerges from the image side surface of the fourth lens, and CRAmax be the maximum angle of incidence of all chief rays of the imaging optical lens on the image surface. Then, the following conditional expressions (5) to (7) and (14) to (16) are satisfied. -0.300≦Sin(A1.0out14)*R14 / f7≦0.003 (5) 1.05≦(f1+f2+f3+f4) / (f5+f6+f7)≦2.30 (6) -1.40≦Sin(A0.8out8)*R8 / f4≦0.10 (7) 1.60≦f1 / R1+f4 / R8≦3.00 (14) -14.00≦f2 / R4+f3 / R5≦-5.50 (15) 35.00°≦CRAmax≦40.00° (16)

[0013] Preferably, the following conditional expression (17) is satisfied. 1.95≦f1 / R1+f4 / R8≦2.55 (17)

[0014] Preferably, the following conditional expression (18) is satisfied. -12.00≦f2 / R4+f3 / R5≦-7.00 (18)

[0015] Preferably, the following conditional expression (9) is satisfied. -0.230≦Sin(A1.0out14)*R14 / f7≦0.003 (9)

[0016] Preferably, the following conditional expression (10) is satisfied. 1.25≦(f1+f2+f3+f4) / (f5+f6+f7)≦2.00 (10)

[0017] Preferably, the following conditional expression (11) is satisfied. -1.20≦Sin(A0.8out8)*R8 / f4≦0.10 (11)

[0018] Preferably, when the axial thickness of the seventh lens is d13, the following conditional expression (19) is satisfied: -15.00≦f7 / d13≦-8.50 (19)

[0019] Preferably, the following conditional expression (20) is satisfied. -12.00≦f7 / d13≦-10.00 (20)

[0020] Preferably, the following conditional expression (21) is satisfied. -4.80≦f7 / R14≦-1.60 (21)

[0021] Preferably, the following conditional expression (22) is satisfied. -4.00≦f7 / R14≦-2.00 (22)

[0022] Preferably, the first lens is made of a glass material. [Effects of the Invention]

[0023] The beneficial effects of the present invention are as follows: The imaging optical lens according to the present invention has excellent optical properties, and is characterized by sufficient correction of aberrations, a large aperture, a wide angle, an extremely thin design, a diverse structural design, and a high degree of sensor matching, and is particularly applicable to imaging lens units for mobile phones, web imaging lenses, and vehicle-mounted lenses, which are configured with imaging elements such as high-pixel CCDs and CMOSs.

[0024] In order to more clearly explain the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for the embodiments. Obviously, the drawings described below are only some embodiments of the present invention, and those skilled in the art can further obtain other drawings based on these drawings without any creative work. [Brief explanation of the drawings]

[0025] [Figure 1] 1 is a schematic diagram showing the configuration of an imaging optical lens according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a schematic diagram showing axial chromatic aberration of the imaging optical lens shown in FIG. [Figure 3] 2 is a schematic diagram showing chromatic aberration of magnification of the imaging optical lens shown in FIG. [Figure 4] 2 is a schematic diagram showing the curvature of field and distortion of the imaging optical lens shown in FIG. [Figure 5] FIG. 4 is a schematic diagram showing the configuration of an imaging optical lens according to a second embodiment of the present invention. [Figure 6] FIG. 6 is a schematic diagram showing the longitudinal chromatic aberration of the imaging optical lens shown in FIG. [Figure 7] FIG. 6 is a schematic diagram showing chromatic aberration of magnification of the imaging optical lens shown in FIG. [Figure 8] 6 is a schematic diagram showing the curvature of field and distortion of the imaging optical lens shown in FIG. 5. [Figure 9]FIG. 10 is a schematic diagram showing the configuration of an imaging optical lens according to a third embodiment of the present invention. [Figure 10] FIG. 10 is a schematic diagram showing the longitudinal chromatic aberration of the imaging optical lens shown in FIG. [Figure 11] 10 is a schematic diagram showing chromatic aberration of magnification of the imaging optical lens shown in FIG. [Figure 12] 10A and 10B are schematic diagrams showing the curvature of field and distortion of the imaging optical lens shown in FIG. [Figure 13] FIG. 10 is a schematic diagram showing the configuration of an imaging optical lens according to a fourth embodiment of the present invention. [Figure 14] FIG. 14 is a schematic diagram showing the longitudinal chromatic aberration of the imaging optical lens shown in FIG. [Figure 15] FIG. 14 is a schematic diagram showing chromatic aberration of magnification of the imaging optical lens shown in FIG. [Figure 16] 14 is a schematic diagram showing the curvature of field and distortion of the imaging optical lens shown in FIG. 13. DETAILED DESCRIPTION OF THE INVENTION

[0026] In order to make the objectives, solutions, and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings. It will be understood by those skilled in the art that many technical details are provided in the embodiments of the present invention to better understand the present invention. However, the technical solution to be protected by the present invention can be realized without these technical details and various changes and modifications based on the following embodiments.

[0027] As shown in Figures 1 to 16, the technical solution of the present invention provides imaging optical lenses 10, 20, 30, and 40. Figures 1, 5, 9, and 13 show imaging optical lenses 10, 20, 30, and 40 according to the present invention, each of which includes seven lenses. Specifically, the imaging optical lenses include, in order from the object side to the image side, a diaphragm S1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. An optical element such as an optical filter GF may be provided between the seventh lens L7 and the image plane Si.

[0028] The first lens L1 is made of glass, the second lens L2 is made of plastic, the third lens L3 is made of plastic, the fourth lens L4 is made of plastic, the fifth lens L5 is made of plastic, the sixth lens L6 is made of plastic, and the seventh lens L7 is made of plastic. The combination of glass and plastic lenses serves to reduce chromatic aberration and improve the performance of the optical imaging lens. Each lens may also be made of other materials.

[0029] The object-side and image-side surfaces of the first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6 and seventh lens L7 are all aspheric.

[0030] The first lens L1 has a paraxially convex object side surface and a paraxially concave image side surface, and has positive refractive power. The object side and image side surfaces of the first lens L1 may be arranged in other concave / convex distributions.

[0031] The second lens L2 has a paraxially convex object side surface and a paraxially concave image side surface, and has negative refractive power. The object side and image side surfaces of the second lens L2 may be arranged in other concave / convex distributions.

[0032] The third lens L3 has a paraxially concave object side surface and a paraxially concave image side surface, and the third lens L3 has negative refractive power. The object side and image side surfaces of the third lens L3 may be arranged in other concave / convex distributions.

[0033] The fourth lens L4 has a paraxially convex object side surface and a paraxially convex image side surface, and has positive refractive power. The object side and image side surfaces of the fourth lens L4 may be arranged in other concave / convex distributions.

[0034] The fifth lens L5 has a paraxially convex object side surface and a paraxially concave image side surface, and has negative refractive power. The object side and image side surfaces of the fifth lens L5 may be arranged in other concave / convex distributions.

[0035] The sixth lens L6 has a paraxially convex object side surface and a paraxially convex image side surface, and has positive refractive power. The object side and image side surfaces of the sixth lens L6 may be arranged in other concave / convex distributions.

[0036] The seventh lens L7 has a paraxially convex object side surface and a paraxially concave image side surface, and has negative refractive power. The object side and image side surfaces of the seventh lens L7 may be arranged in other concave / convex distributions.

[0037] If the focal length of the third lens L3 is defined as f3 and the focal length of the fourth lens L4 is defined as f4, the conditional expression -1.40≦f3 / f4≦−0.60 is satisfied. By rationally allocating the ratio of the focal lengths of the third lens and the fourth lens within the range of this conditional expression, it is possible to prevent light rays from being deflected too much when passing through the system, reduce the difficulty of aberration correction, and better correct the lens's field curvature and distortion aberration, ensuring that the lens's field curvature and distortion aberration are controlled to a small level, thereby achieving high-pixel imaging for the system.

[0038] If the central radius of curvature of the object-side surface of the fifth lens L5 at the paraxial direction is defined as R9 and the central radius of curvature of the image-side surface of the fifth lens L5 at the paraxial direction is defined as R10, then the conditional formula 1.20≦R9 / R10≦1.90 is satisfied. Within the range of the conditional formula, the fifth lens can have a small refractive power, and by combining with the fourth lens, the chromatic aberration of the system can be better corrected and the overall imaging quality can be improved.

[0039] If the entrance pupil diameter of the imaging optical lens is defined as ENPD and the angle of view of the imaging optical lens at 1.0 field of view is defined as FOV, then the conditional formula 5.10≦ENPD / Tan(FOV / 2)≦5.70 is satisfied. By defining the entrance pupil diameter and angle of view within a reasonable range, a compact FNO lens can be realized, the amount of incident light can be increased, and the demand for a wider angle can be met.

[0040] If the axial distance from the image-side surface of the first lens L1 to the object-side surface of the second lens L2 is defined as d2, and the axial distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3 is defined as d4, then the conditional expression 0.30≦d2 / d4≦0.60 is satisfied. By rationally setting the air spacing between the first, second, and third lenses, the peripheral structure of the lenses, particularly the thickness of the peripheral portions of the lenses, can be rationally designed, allowing for more diverse designs for the connection structure between the lenses. Preferably, the conditional expression 0.30≦d2 / d4≦0.50 is satisfied.

[0041] When a chief ray of a 1.0 field of view of the imaging optical lens emerges from the image side surface of the seventh lens L7, the included angle between the chief ray and the optical axis is defined as Sin(A1.0out14), the focal length of the seventh lens L7 is defined as f7, and the central radius of curvature of the paraxial image side surface of the seventh lens L7 is defined as R14, then the conditional expression -0.300≦Sin(A1.0out14)*R14 / f7≦0.003 is satisfied. Controlling the relationship between the included angle between the chief ray of a 1.0 field of view of the imaging optical lens and the optical axis when the chief ray emerges from the image side surface of the seventh lens, the central radius of curvature of the image side surface of the seventh lens, and the focal length of the seventh lens is advantageous in increasing the image height to match a large image height sensor, and in better matching the chief ray angle of an imaging sensor in the 1.0 field of view to obtain a higher quality image. Preferably, the conditional expression −0.230≦Sin(A1.0out14)*R14 / f7≦0.003 is satisfied.

[0042] If the focal length of the first lens L1 is defined as f1, the focal length of the second lens L2 as f2, the focal length of the third lens L3 as f3, the focal length of the fourth lens L4 as f4, the focal length of the fifth lens L5 as f5, the focal length of the sixth lens L6 as f6, and the focal length of the seventh lens L7 as f7, then the conditional formula 1.05≦(f1+f2+f3+f4) / (f5+f6+f7)≦2.30 is satisfied. Rational control of the power of each lens is beneficial for achieving a wide-angle, ultra-thin lens, while the last three lenses can better correct aberrations. Preferably, the conditional formula 1.25≦(f1+f2+f3+f4) / (f5+f6+f7)≦2.00 is satisfied.

[0043] When a chief ray of a 0.8x field of view of the imaging optical lens emerges from the image side surface of the fourth lens L4, the included angle between the chief ray and the optical axis is defined as Sin(A0.8out8), the central radius of curvature of the paraxial image side surface of the fourth lens L4 is defined as R8, and the focal length of the fourth lens L4 is defined as f4, and the conditional formula -1.40≦Sin(A0.8out8)*R8 / f4≦0.10 is satisfied. Controlling the relationship between the included angle between the chief ray of a 0.8x field of view of the imaging optical lens and the optical axis when the chief ray emerges from the image side surface of the fourth lens, the central radius of curvature of the image side surface of the fourth lens, and the focal length of the fourth lens, is advantageous in that the chief ray angle of the imaging sensor can be better matched at the 0.8x field of view and acquiring higher quality images, and it is also advantageous in that the imaging optical lens can better adjust the focal position of the light, improving the light focusing ability of the imaging optical lens and effectively balancing the axial aberration of the imaging optical lens. Preferably, the conditional expression -1.20≦Sin(A0.8out8)*R8 / f4≦0.10 is satisfied.

[0044] If the axial thickness of the sixth lens L6 is defined as d11, the condition 9.00≦f6 / d11≦16.00 is satisfied. The ratio of the focal length to the axial thickness of the sixth lens L6 can be rationally controlled, which is advantageous for correcting aberrations and improving the ease of fabricating the sixth lens. Preferably, the condition 11.00≦f6 / d11≦14.00 is satisfied.

[0045] If the paraxial central radius of curvature of the object-side surface of the first lens L1 is defined as R1, the conditional expression 1.60≦f1 / R1+f4 / R8≦3.00 is satisfied. Within the range of this conditional expression, this is advantageous for reducing the assembly sensitivity of the front four lenses, improving assembly yield, and reducing aberrations. Preferably, the conditional expression 1.95≦f1 / R1+f4 / R8≦2.55 is satisfied.

[0046] If the central radius of curvature of the image-side surface of the second lens L2 at the paraxial direction is defined as R4 and the central radius of curvature of the object-side surface of the third lens L3 at the paraxial direction is defined as R5, then the conditional formula -14.00≦f2 / R4+f3 / R5≦-5.50 is satisfied. Within the range of this conditional formula, the imaging optical lens can better adjust the focal position of light rays, improve the imaging optical lens's light-gathering ability, and effectively balance the axial aberration of the imaging optical lens. Preferably, the conditional formula -12.00≦f2 / R4+f3 / R5≦-7.00 is satisfied.

[0047] If the maximum angle of incidence of all chief rays of the imaging optical lens on the image plane Si is defined as CRAmax, the conditional expression 35.00°≦CRAmax≦40.00° is satisfied. By controlling the maximum angle of incidence of the chief rays within the range of the conditional expression, the imaging sensor can be matched to obtain higher image quality.

[0048] If the axial thickness of the seventh lens L7 is defined as d13, the conditional expression -15.00≦f7 / d13≦-8.50 is satisfied. Within the range of the conditional expression, it is advantageous to adjust the shape of the seventh lens, improve processability, and increase production yield. Preferably, the conditional expression -12.00≦f7 / d13≦-10.00 is satisfied.

[0049] If the focal length of the seventh lens L7 is defined as f7 and the central radius of curvature of the paraxial image-side surface of the seventh lens L7 is defined as R14, the seventh lens L7 satisfies the conditional formula -4.80≦f7 / R14≦-1.60. Within the range of the conditional formula, it is advantageous to adjust the shape and refractive power of the seventh lens to correct aberrations. Preferably, the conditional formula -4.00≦f7 / R14≦-2.00 is satisfied.

[0050] Compared with the prior art, the imaging optical lens according to the present invention satisfies the following conditions: -1.40≦f3 / f4≦-0.60, 1.20≦R9 / R10≦1.90, 5.10≦ENPD / Tan(FOV / 2)≦5.70, 0.30≦d2 / d4≦0.60, -0.300≦Sin(A1.0out14)*R14 / f7≦0.003, 1.05≦(f1+f2+f3+f4) / (f5+f6+f7)≦2.30, -1.40≦Sin(A0.8out8)*R8 / f4≦0.003 By arranging the lenses to meet the .10 standard, the degree of optical deflection is controlled, reducing the difficulty of aberration correction and ensuring that the lens's field curvature and distortion are kept to a low level, achieving high-resolution imaging. The fifth lens has a small refractive power, and when combined with the fourth lens, it can better correct chromatic aberration, improving overall imaging quality. This allows for a small FNO and a large aperture, increasing the amount of incident light while meeting the demand for a wider angle of view. The rational design of the lens peripheral structure, especially the thickness of the lens periphery, allows for more diversified design of the inter-lens connection structure. It also increases the image height to match large image height sensors, and better matches the chief ray angle of the imaging sensor between the 1.0 and 0.8x fields of view, favoring better image capture. By rationally controlling the power of each lens, it is beneficial to achieve the effects of widening the angle and making the lens extremely thin. The last three lenses can better correct aberrations, which is beneficial to the imaging optical lens to better adjust the focal position of light rays, improve the light-gathering ability of the imaging optical lens, and effectively balance the axial aberration of the imaging optical lens.

[0051] Furthermore, compared to the prior art, the present invention further satisfies the following conditional expressions: −0.300≦Sin(A1.0out14)*R14 / f7≦0.003, 1.05≦(f1+f2+f3+f4) / (f5+f6+f7)≦2.30, −1.40≦Sin(A0.8out8)*R8 / f4≦0.10, 1.60≦f1 / R1+f4 / R8≦3.00, −14.00≦f2 / R4+f3 / R5≦−5.50, and 35.00°≦CRAmax≦40.00°. This is advantageous for increasing the image height to match a large image height sensor, and also for better matching of the chief ray angle of the imaging sensor between the 1.0 and 0.8x fields of view, enabling the acquisition of better images. Rational control of the power of each lens is beneficial to achieving the effects of widening the angle and making the lens extremely thin, and the rear three lenses can better correct aberrations, better adjust the focal position of the light beam of the imaging optical lens, improve the light-gathering ability of the imaging optical lens, and effectively balance the axial aberration of the imaging optical lens. In addition, it is beneficial to reduce the assembly sensitivity of the front four lenses and improve the assembly yield.

[0052] The imaging optical lens of the present invention will be described below using examples. The symbols used in each example are as follows: The focal length, axial distance, central radius of curvature, and axial thickness are all in mm.

[0053] TTL: Optical length (the axial distance from the object side of the first lens L1 to the image plane Si), expressed in mm. FNO: The ratio of the effective focal length of an imaging optical lens to the entrance pupil diameter.

[0054] The technical solution of the present invention will be specifically described below in four embodiments.

[0055] (First embodiment) Tables 1 and 2 show design data for the imaging optical lens 10 according to the first embodiment of the present invention.

[0056] [Table 1]

[0057] Here, the meaning of each symbol is as follows: S1: Aperture R: Radius of curvature at the center of the optical surface R1: central radius of curvature of the object side surface of the first lens L1 on the paraxial line R2: central radius of curvature of the image side surface of the first lens L1 on the paraxial line R3: The central radius of curvature of the object-side surface of the second lens L2 on the paraxial line R4: The central radius of curvature of the image side of the second lens L2 on the paraxial line R5: The central radius of curvature of the object-side surface of the third lens L3 on the paraxial line R6: The central radius of curvature of the image side of the third lens L3 on the paraxial line R7: The central radius of curvature of the object-side surface of the fourth lens L4 on the paraxial line R8: The central radius of curvature of the image side of the fourth lens L4 on the paraxial line R9: The central radius of curvature of the object-side surface of the fifth lens L5 on the paraxial line R10: The central radius of curvature of the image side of the fifth lens L5 on the paraxial line R11: The central radius of curvature of the object side surface of the sixth lens L6 on the paraxial line R12: The central radius of curvature of the image side of the sixth lens L6 on the paraxial line R13: The central radius of curvature of the object side surface of the seventh lens L7 on the paraxial line R14: The central radius of curvature of the seventh lens L7 on the image side at the paraxial R15: The central radius of curvature of the object-side surface of the optical filter GF on the paraxial line R16: Central radius of curvature of the image side of the optical filter GF on the paraxial line d: Axial thickness of lens, axial distance between lenses d0: On-axis distance from aperture S1 to the object side of the first lens L1 d1: Axial thickness of the first lens L1 d2: On-axis distance from the image side surface of the first lens L1 to the object side surface of the second lens L2 d3: Axial thickness of the second lens element L2 d4: The axial distance from the image side surface of the second lens L2 to the object side surface of the third lens L3 d5: Axial thickness of the third lens element L3 d6: On-axis distance from the image side surface of the third lens L3 to the object side surface of the fourth lens L4 d7: Axial thickness of the fourth lens element L4 d8: The axial distance from the image side surface of the fourth lens L4 to the object side surface of the fifth lens L5 d9: Axial thickness of the fifth lens element L5 d10: the axial distance from the image side surface of the fifth lens L5 to the object side surface of the sixth lens L6 d11: Axial thickness of the sixth lens element L6 d12: the axial distance from the image side surface of the sixth lens L6 to the object side surface of the seventh lens L7 d13: Axial thickness of the seventh lens element L7 d14: The axial distance from the image side surface of the seventh lens L7 to the object side surface of the optical filter GF d15: On-axis thickness of optical filter GF d16: On-axis distance from the image side of the optical filter GF to the image plane Si nd: Refractive index of the d line (d line is green light with a wavelength of 550 nm) nd1: refractive index of the first lens L1 at the d line nd2: refractive index of the d line of the second lens L2 nd3: refractive index of the d line of the third lens L3 nd4: Refractive index of the d line of the fourth lens L4 nd5: refractive index of the d line of the fifth lens L5 nd6: Refractive index of the d line of the sixth lens L6 nd7: Refractive index of the d line of the seventh lens L7 ndg: refractive index of the d line of the optical filter GF vd: Abbe number v1: Abbe number of the first lens L1 v2: Abbe number of the second lens L2 v3: Abbe number of the third lens element L3 v4: Abbe number of the fourth lens element L4 v5: Abbe number of the fifth lens element L5 v6: Abbe number of the sixth lens element L6 v7: Abbe number of the seventh lens element L7 vg: Abbe number of the optical filter GF

[0058] Table 2 shows the aspheric surface data of each lens in the imaging optical lens 10 of the first embodiment according to the present invention.

[0059] [Table 2]

[0060] For convenience, the aspherical surface of each lens surface is expressed by the following formula (23): However, the present invention is not particularly limited to the form of the aspherical polynomial of formula (23).

[0061] z=(cr 2 ) / {1+[1-(k+1)(c 2 r 2 )] 1 / 2}+A4r 4 +A6r 6 +A8r 8 +A10r 10 +A12r 12 +A14r 14 +A16r 16 +A18r 18 +A20r 20 +A22r 22 +A24r 24 +A26r 26 +A28r 28 +A30r 30 (twenty three)

[0062] where k is a conic coefficient, A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 are aspheric coefficients, c is the curvature at the center of the optical surface, r is the perpendicular distance between a point on the aspheric curve and the optical axis, and z is the aspheric depth (the perpendicular distance between a point on the aspheric surface that is at a distance r from the optical axis and a tangent plane that is tangent to the vertex of the aspheric surface on the optical axis).

[0063] 2 and 3 are schematic diagrams showing the axial chromatic aberration and chromatic aberration of magnification of light with wavelengths of 656 nm, 588 nm, 546 nm, 486 nm, and 436 nm, respectively, after passing through the imaging optical lens 10 according to the first embodiment. Fig. 4 is a schematic diagram showing the curvature of field and distortion of light with wavelength of 546 nm after passing through the imaging optical lens 10 according to the first embodiment, where the curvature of field S in Fig. 4 is the curvature of field in the sagittal direction and T is the curvature of field in the tangential direction.

[0064] In this embodiment, the entrance pupil diameter ENPD of the imaging optical lens 10 is 4.806 mm, the image height IH of the full field of view (1.0 field of view) is 8.000 mm, the angle of view FOV in the diagonal direction of the full field of view (1.0 field of view) is 85.59°, the image height IH of the MIC field of view is 8.230 mm, and the angle of view FOV in the diagonal direction of the MIC field of view is 87.37°. The imaging optical lens 10 satisfies design requirements such as a large aperture, a wide angle, an extremely thin design, diversified structural design, and a high degree of sensor matching, and its on-axis and off-axis chromatic aberrations are sufficiently corrected, and it has excellent optical characteristics.

[0065] As can be understood, the image height of the 1.0 field of view refers to half the diagonal length of the sensor's effective pixel area, the image height of the MIC field of view refers to the field of view height that extends outward from the image height of the 1.0 field of view to prevent assembly variations, the FOV in the diagonal direction of the 1.0 field of view refers to the angle of view corresponding to the sensor's effective pixel area, and the FOV in the diagonal direction of the MIC field of view refers to the angle of view corresponding to the image height of the MIC field of view.

[0066] (Second embodiment) The meanings of the symbols in the second embodiment are the same as those in the first embodiment.

[0067] FIG. 5 shows an imaging optical lens 20 according to a second embodiment of the present invention.

[0068] Tables 3 and 4 show design data for the imaging optical lens 20 according to the second embodiment of the present invention.

[0069] [Table 3]

[0070] Table 4 shows the aspheric data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.

[0071] [Table 4]

[0072] 6 and 7 are schematic diagrams showing the axial chromatic aberration and chromatic aberration of magnification of light with wavelengths of 656 nm, 588 nm, 546 nm, 486 nm, and 436 nm, respectively, after passing through the imaging optical lens 20 according to the second embodiment. Fig. 8 is a schematic diagram showing the curvature of field and distortion of light with wavelength of 546 nm after passing through the imaging optical lens 20 according to the second embodiment. In Fig. 8, the curvature of field S is the curvature of field in the sagittal direction, and T is the curvature of field in the tangential direction.

[0073] In this embodiment, the entrance pupil diameter ENPD of the imaging optical lens 20 is 4.926 mm, the image height IH of the full field of view (1.0 field of view) is 8.000 mm, the diagonal field of view FOV of the full field of view (1.0 field of view) is 84.77°, the image height IH of the MIC field of view is 8.230 mm, and the diagonal field of view FOV of the MIC field of view is 86.60°. The imaging optical lens 20 satisfies design requirements such as a large aperture, a wide angle of view, an extremely thin design, diversified structural design, and a high degree of sensor matching, and its on-axis and off-axis chromatic aberrations are sufficiently corrected, and it has excellent optical characteristics.

[0074] (Third embodiment) The meanings of the symbols in the third embodiment are the same as those in the first embodiment.

[0075] FIG. 9 shows an imaging optical lens 30 according to a third embodiment of the present invention.

[0076] Tables 5 and 6 show design data for the imaging optical lens 30 according to the third embodiment of the present invention.

[0077] [Table 5]

[0078] Table 6 shows the aspheric surface data of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.

[0079] [Table 6]

[0080] 10 and 11 are schematic diagrams showing the axial chromatic aberration and chromatic aberration of magnification of light with wavelengths of 656 nm, 588 nm, 546 nm, 486 nm, and 436 nm, respectively, after passing through the imaging optical lens 30 according to the third embodiment. Fig. 12 is a schematic diagram showing the curvature of field and distortion of light with wavelength of 546 nm after passing through the imaging optical lens 30 according to the third embodiment. In Fig. 12, the curvature of field S is the curvature of field in the sagittal direction, and T is the curvature of field in the tangential direction.

[0081] In this embodiment, the entrance pupil diameter ENPD of the imaging optical lens 30 is 4.868 mm, the image height IH of the full field of view (1.0 field of view) is 8.000 mm, the diagonal field of view FOV of the full field of view (1.0 field of view) is 84.97°, the image height IH of the MIC field of view is 8.290 mm, and the diagonal field of view FOV of the MIC field of view is 87.18°. The imaging optical lens 30 satisfies design requirements such as a large aperture, a wide angle of view, an extremely thin design, diversified structural design, and a high degree of sensor matching, and its on-axis and off-axis chromatic aberrations are sufficiently corrected, and it has excellent optical characteristics.

[0082] (Fourth embodiment) The meanings of the symbols in the fourth embodiment are the same as those in the first embodiment.

[0083] FIG. 13 shows an imaging optical lens 40 according to a fourth embodiment of the present invention.

[0084] Tables 7 and 8 show design data for the imaging optical lens 40 according to the fourth embodiment of the present invention.

[0085] [Table 7]

[0086] Table 8 shows the aspheric surface data of each lens in the imaging optical lens 40 according to the fourth embodiment of the present invention.

[0087] [Table 8]

[0088] 14 and 15 are schematic diagrams showing the axial chromatic aberration and chromatic aberration of magnification of light having wavelengths of 656 nm, 588 nm, 546 nm, 486 nm, and 436 nm, respectively, after passing through the imaging optical lens 40 according to the fourth embodiment. Fig. 16 is a schematic diagram showing the curvature of field and distortion of light having a wavelength of 546 nm after passing through the imaging optical lens 40 according to the fourth embodiment. In Fig. 16, the curvature of field S is the curvature of field in the sagittal direction, and T is the curvature of field in the tangential direction.

[0089] In this embodiment, the entrance pupil diameter ENPD of the imaging optical lens 40 is 4.918 mm, the image height IH of the full field of view (1.0 field of view) is 8.000 mm, the angle of view FOV in the diagonal direction of the full field of view (1.0 field of view) is 84.00°, the image height IH of the MIC field of view is 8.230 mm, and the angle of view FOV in the diagonal direction of the MIC field of view is 85.71°, and the imaging optical lens 40 satisfies the design requirements of a large aperture, a wide angle, an extremely thin design, diversified structural design, and a high degree of sensor matching, and its on-axis and off-axis chromatic aberrations are sufficiently corrected, and it has excellent optical characteristics.

[0090] [Table 9]

[0091] As will be understood by those skilled in the art, the above-described embodiments are specific embodiments for realizing the present invention, and in actual applications, various changes in form and details are possible without departing from the spirit and scope of the present invention.

Claims

1. An imaging optical lens, the imaging optical lens being configured by a total of seven lenses, the seven lenses being, in order from the object side to the image side, a first lens having positive refractive power, a second lens having negative refractive power, a third lens having negative refractive power, a fourth lens having positive refractive power, a fifth lens having negative refractive power, a sixth lens having positive refractive power, and a seventh lens having negative refractive power, the first lens has an object side surface that is convex on the paraxial line and an image side surface that is concave on the paraxial line, the second lens has an object side surface that is convex on the paraxial line and an image side surface that is concave on the paraxial line, the third lens has an object side surface that is concave on the paraxial line and an image side surface that is concave on the paraxial line, the fourth lens has an object side surface that is convex on the paraxial line and an image side surface that is convex on the paraxial line, the fifth lens has an object side surface that is convex on the paraxial line and an image side surface that is concave on the paraxial line, the sixth lens has an object side surface that is convex on the paraxial line and an image side surface that is convex on the paraxial line, and the seventh lens has an object side surface that is convex on the paraxial line and an image side surface that is concave on the paraxial line, The focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the focal length of the fifth lens is f5, the focal length of the sixth lens is f6, the focal length of the seventh lens is f7, the central radius of curvature of the image side surface of the fourth lens in the paraxial direction is R8, the central radius of curvature of the object side surface of the fifth lens in the paraxial direction is R9, the central radius of curvature of the image side surface of the fifth lens in the paraxial direction is R10, the central radius of curvature of the image side surface of the fifth lens in the paraxial direction is R14, the entrance pupil diameter of the imaging optical lens is ENPD, the 1st lens diameter of the imaging optical lens is R11, the 2nd lens diameter of the imaging optical lens is R12, the 3rd lens diameter of the imaging optical lens is R13, the 4th lens diameter of the imaging optical lens is R14, the 5th lens diameter of the imaging optical lens is R15, the 6th lens diameter of the imaging optical lens is R16, the 7th lens diameter of the imaging optical lens is R17, the 8th lens diameter of the imaging optical lens is R18, the 9th lens diameter of the imaging optical lens is R19, the 10th lens diameter of the imaging optical lens is R20, the 11th lens diameter of the imaging optical lens is R21, the 12th lens diameter of the imaging optical lens is R22, the 13th lens diameter of the imaging optical lens is R23, the 14th lens diameter of the imaging optical lens is R24, the 15th lens diameter of the imaging optical lens is R25, the 16th lens diameter of the imaging optical lens is R26, the 17th lens diameter of the imaging optical lens is R27, the 18th lens diameter of the imaging optical lens is R28, the 19th lens diameter of the imaging optical lens is R29, the 2 an angle of view of 0.0 field of view is FOV, an axial distance from the image side surface of the first lens to the object side surface of the second lens is d2, an axial distance from the image side surface of the second lens to the object side surface of the third lens is d4, an included angle between a chief ray of a 1.0 field of view of the imaging optical lens and the optical axis when the chief ray emerges from the image side surface of the seventh lens is Sin(A1.0out14), and an included angle between a chief ray of a 0.8x field of view of the imaging optical lens and the optical axis when the chief ray emerges from the image side surface of the fourth lens is Sin(A0.8out8). −1.40≦f3 / f4≦−0.60 (1) 1.20≦R9 / R10≦1.90 (2) 5.10≦ENPD / Tan (FOV / 2)≦5.70 (3) 0.30≦d2 / d4≦0.60 (4) -0.300≦Sin(A1.0out14)*R14 / f7≦0.003 (5) 1.05≦(f1+f2+f3+f4) / (f5+f6+f7)≦2.30 (6) -1.40≦Sin(A0.8out8)*R8 / f4≦0.10 (7)

2. 2. The imaging optical lens according to claim 1, wherein the following conditional expression (8) is satisfied: 0.30≦d2 / d4≦0.50 (8)

3. 2. The imaging optical lens according to claim 1, wherein the following conditional expression (9) is satisfied: -0.230≦Sin(A1.0out14)*R14 / f7≦0.003 (9)

4. 2. The imaging optical lens according to claim 1, wherein the following conditional expression (10) is satisfied: 1.25≦(f1+f2+f3+f4) / (f5+f6+f7)≦2.00 (10)

5. 2. The imaging optical lens according to claim 1, wherein the following conditional expression (11) is satisfied: -1.20≦Sin(A0.8out8)*R8 / f4≦0.10 (11)

6. 2. The imaging optical lens according to claim 1, wherein the following conditional expression (12) is satisfied when the axial thickness of the sixth lens is d11: 9.00≦f6 / d11≦16.00 (12)

7. 7. The imaging optical lens according to claim 6, wherein the following conditional expression (13) is satisfied: 11.00≦f6 / d11≦14.00 (13)

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

9. An imaging optical lens, the imaging optical lens being configured by a total of seven lenses, the seven lenses being, in order from the object side to the image side, a first lens having positive refractive power, a second lens having negative refractive power, a third lens having negative refractive power, a fourth lens having positive refractive power, a fifth lens having negative refractive power, a sixth lens having positive refractive power, and a seventh lens having negative refractive power, the first lens has an object side surface that is convex on the paraxial line and an image side surface that is concave on the paraxial line, the second lens has an object side surface that is convex on the paraxial line and an image side surface that is concave on the paraxial line, the third lens has an object side surface that is concave on the paraxial line and an image side surface that is concave on the paraxial line, the fourth lens has an object side surface that is convex on the paraxial line and an image side surface that is convex on the paraxial line, the fifth lens has an object side surface that is convex on the paraxial line and an image side surface that is concave on the paraxial line, the sixth lens has an object side surface that is convex on the paraxial line and an image side surface that is convex on the paraxial line, and the seventh lens has an object side surface that is convex on the paraxial line and an image side surface that is concave on the paraxial line, The focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the focal length of the fifth lens is f5, the focal length of the sixth lens is f6, the focal length of the seventh lens is f7, the central radius of curvature of the object side surface of the first lens in the paraxial direction is R1, the central radius of curvature of the image side surface of the second lens in the paraxial direction is R4, the central radius of curvature of the object side surface of the third lens in the paraxial direction is R5, the central radius of curvature of the image side surface of the fourth lens in the paraxial direction is R8, the central radius of curvature of the image side surface of the seventh lens in the paraxial direction is R9, an imaging optical lens that satisfies the following conditional expressions (5) to (7) and (14) to (16), where R14 is the central radius of curvature on the axis, Sin(A1.0out14) is the angle between a chief ray of a 1.0 field of view of the imaging optical lens and the optical axis when the chief ray emerges from the image-side surface of the seventh lens, Sin(A0.8out8) is the angle between a chief ray of a 0.8x field of view of the imaging optical lens and the optical axis when the chief ray emerges from the image-side surface of the fourth lens, and CRAmax is the maximum angle of incidence of all chief rays of the imaging optical lens on the image plane. -0.300≦Sin(A1.0out14)*R14 / f7≦0.003 (5) 1.05≦(f1+f2+f3+f4) / (f5+f6+f7)≦2.30 (6) -1.40≦Sin(A0.8out8)*R8 / f4≦0.10 (7) 1.60≦f1 / R1+f4 / R8≦3.00 (14) -14.00≦f2 / R4+f3 / R5≦-5.50 (15) 35.00°≦CRAmax≦40.00° (16)

10. 10. The imaging optical lens according to claim 9, wherein the following conditional expression (17) is satisfied: 1.95≦f1 / R1+f4 / R8≦2.55 (17)

11. 10. The imaging optical lens according to claim 9, wherein the following conditional expression (18) is satisfied: -12.00≦f2 / R4+f3 / R5≦-7.00 (18)

12. 10. The imaging optical lens according to claim 9, wherein the following conditional expression (9) is satisfied: -0.230≦Sin(A1.0out14)*R14 / f7≦0.003 (9)

13. 10. The imaging optical lens according to claim 9, wherein the following conditional expression (10) is satisfied: 1.25≦(f1+f2+f3+f4) / (f5+f6+f7)≦2.00 (10)

14. 10. The imaging optical lens according to claim 9, wherein the following conditional expression (11) is satisfied: -1.20≦Sin(A0.8out8)*R8 / f4≦0.10 (11)

15. 10. The imaging optical lens according to claim 9, wherein the following conditional expression (19) is satisfied when the on-axis thickness of the seventh lens is d13: −15.00≦f7 / d13≦−8.50 (19)

16. 16. The imaging optical lens according to claim 15, wherein the following conditional expression (20) is satisfied: −12.00≦f7 / d13≦−10.00 (20)

17. 10. The imaging optical lens according to claim 9, wherein the following conditional expression (21) is satisfied: −4.80≦f7 / R14≦−1.60 (21)

18. 18. The imaging optical lens according to claim 17, wherein the following conditional expression (22) is satisfied: −4.00≦f7 / R14≦−2.00 (22)

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

Images