Photography optical lens

Abstract

The present invention relates to the field of optical lenses, and discloses an imaging optical lens, which includes a total of seven lenses, which are, 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 positive refractive power, a fourth lens having negative refractive power, a fifth lens having refractive power, a sixth lens having positive refractive power, and a seventh lens having negative refractive power, and satisfy the following relations: 0.95≦f1 / f≦1.25, 60.00≦v1≦82.00, -4.00≦R13 / R14≦-1.00, 1.50≦d4 / d6≦5.00. The photographic optical lens provided by the present invention has excellent optical performance and at the same time meets the design requirements for a large aperture, an ultra-thin shape, and an ultra-wide angle.

Description

[Technical field]

[0001] The present invention relates to the field of optical lenses, and more particularly to an imaging optical lens suitable for imaging devices such as mobile terminals such as smartphones and digital cameras, monitors, and PC lenses. [Background technology]

[0002] In recent years, the rise of various smart devices has led to an increased demand for miniaturized imaging optical lenses. In addition, the pixel size of the photoconductor has been reduced, and the trend in recent electronic devices has been toward thin, lightweight, and portable devices with excellent functionality. As a result, miniaturized imaging optical lenses with good imaging quality are becoming the mainstream in the current market. In order to obtain good imaging quality, multi-plate lens structures are often adopted. With the development of technology and the increasing diversification of user needs, the pixel area of ​​the photoconductor is constantly shrinking, and the requirements for the imaging quality of the system are constantly improving, so that seven-plate lens structures have gradually appeared in lens design. There is a strong demand for wide-angle imaging lenses with excellent optical characteristics, small size, and sufficient correction of aberrations. Summary of the Invention [Problem to be solved by the invention]

[0003] The present invention has been made in view of the above problems, and has an object to provide an imaging optical lens that has good optical performance and satisfies design requirements such as a large aperture, an ultra-thin shape, and an ultra-wide angle. [Means for solving the problem]

[0004] To achieve the above objective, the technical solution of the present invention provides an imaging optical lens, which includes a total of seven lenses, which are, 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 positive refractive power, a fourth lens having negative refractive power, a fifth lens having refractive power, a sixth lens having positive refractive power, and a seventh lens having negative refractive power. wherein the focal length of the first lens is f1, the focal length of the imaging optical lens is f, the Abbe number of the first lens is v1, the central radius of curvature of the object side surface of the seventh lens is R13, the central radius of curvature of the image side surface of the seventh lens is R14, the axial distance between the second lens and the third lens is d4, the axial distance between the third lens and the fourth lens is d6, and the following relations are satisfied: 0.95≦f1 / f≦1.25, 60.00≦v1≦82.00, -4.00≦R13 / R14≦-1.00, 1.50≦d4 / d6≦5.00.

[0005] Preferably, the central radius of curvature of the object side surface of the fourth lens is R7, the central radius of curvature of the image side surface of the fourth lens is R8, and the relational expression of 2.00≦(R7+R8) / (R7-R8)≦20.00 is satisfied.

[0006] Preferably, the object side surface of the first lens is a convex surface near an axis, and the image side surface of the first lens is a concave surface near an axis, the central radius of curvature of the object side surface of the first lens is R1, the central radius of curvature of the image side surface of the first lens is R2, the axial thickness of the first lens is d1, and the total optical length of the imaging optical lens is TTL, and the following relations are satisfied: -4.14≦(R1+R2) / (R1-R2)≦-1.06, 0.06≦d1 / TTL≦0.21.

[0007] Preferably, the object side surface of the second lens is a convex surface near an axis, and the image side surface of the second lens is a concave surface near an axis, the focal length of the second lens is f2, the central radius of curvature of the object side surface of the second lens is R3, the central radius of curvature of the image side surface of the second lens is R4, the axial thickness of the second lens is d3, and the total optical length of the imaging optical lens is TTL, and the following relations are satisfied: -15.86≦f2 / f≦-3.01, 2.67≦(R3+R4) / (R3-R4)≦12.77, and 0.02≦d3 / TTL≦0.05.

[0008] Preferably, the image side surface of the third lens is convex near an axis, the focal length of the third lens is f3, the central radius of curvature of the object side surface of the third lens is R5, the central radius of curvature of the image side surface of the third lens is R6, the axial thickness of the third lens is d5, the total optical length of the imaging optical lens is TTL, and the following relational expressions are satisfied: 3.47≦f3 / f≦24.78, -0.25≦(R5+R6) / (R5-R6)≦1.61, 0.03≦d5 / TTL≦0.12.

[0009] Preferably, the object side surface of the fourth lens is convex near an axis, and the image side surface of the fourth lens is concave near an axis, the focal length of the fourth lens is f4, the axial thickness of the fourth lens is d7, and the total optical length of the imaging optical lens is TTL, and the following relations are satisfied: -62.59≦f4 / f≦-2.51, 0.02≦d7 / TTL≦0.06.

[0010] Preferably, the object side surface of the fifth lens is a convex surface near an axis, and the image side surface of the fifth lens is a concave surface near an axis, the focal length of the fifth lens is f5, the central radius of curvature of the object side surface of the fifth lens is R9, the central radius of curvature of the image side surface of the fifth lens is R10, the axial thickness of the fifth lens is d9, and the total optical length of the imaging optical lens is TTL, and the following relations are satisfied: -30.01≦f5 / f≦27.49, -7.90≦(R9+R10) / (R9-R10)≦6.02, and 0.04≦d9 / TTL≦0.13.

[0011] Preferably, the object side surface of the sixth lens is a convex surface near an axis, and the image side surface of the sixth lens is a concave surface near an axis, the focal length of the sixth lens is f6, the central radius of curvature of the object side surface of the sixth lens is R11, the central radius of curvature of the image side surface of the sixth lens is R12, the axial thickness of the sixth lens is d11, and the total optical length of the imaging optical lens is TTL, and the following relations are satisfied: 0.46≦f6 / f≦1.71, −3.58≦(R11+R12) / (R11-R12)≦−1.11, and 0.04≦d11 / TTL≦0.13.

[0012] Preferably, the object side surface of the seventh lens is concave near an axis, the image side surface of the seventh lens is concave near an axis, the focal length of the seventh lens is f7, the axial thickness of the seventh lens is d13, and the total optical length of the imaging optical lens is TTL, and the following relations are satisfied: -1.41≦f7 / f≦-0.43, 0.02≦d13 / TTL≦0.09.

[0013] Preferably, the first lens is made of a glass material. Effect of the Invention

[0014] The beneficial effects of the present invention are as follows: The imaging optical lens according to the present invention has excellent optical characteristics, and has characteristics of a large aperture, a wide angle, and an ultra-thin shape, and is particularly suitable for imaging lens units for mobile phones and imaging lenses for the web, which are made of imaging elements such as CCD and CMOS for high pixel counts. [Brief description of the drawings]

[0015] In order to more clearly describe the technical solutions in the embodiments of the present invention, the accompanying drawings that need to be used in the description of the embodiments are briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention, and those skilled in the art can also obtain other drawings based on these drawings without paying creative labor. [Figure 1]1 is a schematic diagram illustrating a configuration of an imaging optical lens according to a first embodiment of the present invention. [Diagram 2] 2 is a schematic diagram of the longitudinal chromatic aberration of the imaging optical lens shown in FIG. 1. [Diagram 3] 2 is a schematic diagram of lateral chromatic aberration of the imaging optical lens shown in FIG. 1. [Figure 4] 2 is a schematic diagram of the field curvature and distortion of the imaging optical lens shown in FIG. 1. [Diagram 5] FIG. 5 is a schematic diagram illustrating a configuration of an imaging optical lens according to a second embodiment of the present invention. [Figure 6] 6 is a schematic diagram of the longitudinal chromatic aberration of the imaging optical lens shown in FIG. 5. [Figure 7] 6 is a schematic diagram of lateral chromatic aberration of the imaging optical lens shown in FIG. 5. [Figure 8] 6 is a schematic diagram of the field curvature and distortion of the imaging optical lens shown in FIG. 5. [Figure 9] FIG. 11 is a schematic diagram illustrating a configuration of an imaging optical lens according to a third embodiment of the present invention. [Figure 10] 10 is a schematic diagram of the longitudinal chromatic aberration of the imaging optical lens shown in FIG. [Figure 11] 10 is a schematic diagram of lateral chromatic aberration of the imaging optical lens shown in FIG. 9. [Figure 12] 10 is a schematic diagram of the field curvature and distortion of the imaging optical lens shown in FIG. 9. [Figure 13] FIG. 11 is a schematic diagram illustrating a configuration of an imaging optical lens according to a fourth embodiment of the present invention. [Figure 14] FIG. 14 is a schematic diagram of the longitudinal chromatic aberration of the imaging optical lens shown in FIG. [Figure 15] 14 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in FIG. 13. [Figure 16] 14 is a schematic diagram of the field curvature and distortion of the imaging optical lens shown in FIG. 13. [Figure 17] FIG. 13 is a schematic diagram illustrating a configuration of an imaging optical lens according to a fifth embodiment of the present invention. [Figure 18] 18 is a schematic diagram of the longitudinal chromatic aberration of the imaging optical lens shown in FIG. 17. [Figure 19]18 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in FIG. 17. [Figure 20] 18 is a schematic diagram of the field curvature and distortion of the imaging optical lens shown in FIG. 17. [Figure 21] FIG. 13 is a schematic diagram of a configuration of an imaging optical lens according to a comparative embodiment. [Figure 22] 22 is a schematic diagram of the longitudinal chromatic aberration of the imaging optical lens shown in FIG. 21. [Diagram 23] 22 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in FIG. 21. [Figure 24] 22 is a schematic diagram of the field curvature and distortion of the imaging optical lens shown in FIG. 21. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] In order to make the objectives, technical solutions and advantages of the present invention clearer, the embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. Those skilled in the art can understand that in various embodiments of the present invention, many technical details are presented to allow readers to better understand the present invention. The technical solutions of the claims of the present invention can also be implemented without these technical details and various changes and modifications based on the following embodiments.

[0017] The technical solution of the present invention provides imaging optical lenses 10, 20, 30, 40, 50, referring to the drawings. The imaging optical lenses 10, 20, 30, 40, 50 of the present invention are shown in Figs. 1, 5, 9, 13, 17, and the imaging optical lenses 10, 20, 30, 40, 50 include seven lenses in total. The imaging optical lenses of the present invention specifically 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 of the present invention and an image plane Si.

[0018] 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. Each lens may be made of other materials.

[0019] The object side and image side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are all aspheric.

[0020] Here, the focal length of the imaging optical lens is defined as f, the focal length of the first lens L1 is defined as f1, and they satisfy the relational formula of 0.95≦f1 / f≦1.25, which specifies the range of the ratio of the focal length of the first lens L1 to the focal length of the imaging optical lens. Within this range, the optical focal length of the imaging optical lens can be reasonably set so that the imaging optical lens has better imaging quality and lower sensitivity.

[0021] The Abbe number of the first lens L1 is defined as v1, which satisfies the relational expression 60.00≦v1≦82.00. This relational expression specifies the Abbe number of the first lens L1. Within this range, the material attributes are effectively allocated, and the chromatic aberration is effectively corrected so that the chromatic aberration |LC|≦4.0 μm.

[0022] The central radius of curvature of the object side surface of the seventh lens L7 is defined as R13, and the central radius of curvature of the image side surface of the seventh lens L7 is defined as R14, which satisfies the relational expression of -4.00≦R13 / R14≦-1.00. This relational expression defines the shape of the seventh lens L7, and within the range of the relational expression, it is advantageous to correct the astigmatism and distortion of the imaging optical lens, so that the distortion |Distortion|≦2.5%, and reduce the possibility of dark angles occurring.

[0023] The axial distance between the second lens L2 and the third lens L3 is defined as d4, and the axial distance between the third lens L3 and the fourth lens L4 is defined as d6. They satisfy the relational formula of 1.50≦d4 / d6≦5.00, which specifies the range of the ratio between the air distance between the second and third lenses and the air distance between the third and fourth lenses. By rationally distributing the air distances between the lenses, it is advantageous to reduce the difficulty of assembly in the actual production process and improve the yield rate.

[0024] When the above several conditional expressions are satisfied, the imaging optical lenses 10, 20, 30, 40, 50 have good optical performance and can satisfy design requirements for a large aperture, a wide angle, and an ultra-thin shape. Due to the characteristics of the imaging optical lenses 10, 20, 30, 40, 50, the imaging optical lenses 10, 20, 30, 40, 50 are particularly suitable as imaging lens units for mobile phones and imaging lenses for the web, which are configured with imaging elements such as high-pixel CCDs and CMOSs.

[0025] Based on the above conditional expressions and the functions that can be realized, the characteristics of each lens can be further detailed as follows.

[0026] The central radius of curvature of the object side surface of the fourth lens L4 is defined as R7, and the central radius of curvature of the image side surface of the fourth lens L4 is defined as R8, satisfying the relational expression 2.00≦(R7+R8) / (R7-R8)≦20.00. This relational expression defines the shape of the fourth lens L4, and within the range of the relational expression, is advantageous for reducing the degree of refraction of light passing through the lens, and can effectively reduce aberration.

[0027] The first lens L1 has a positive refractive power and is convex on the object side near the axis and concave on the image side near the axis. The object side and image side surfaces of the first lens L1 may have other concave and convex distribution patterns.

[0028] The radius of curvature of the object side surface of the first lens L1 is defined as R1, and the radius of curvature of the image side surface of the first lens L1 is defined as R2, and the relationship satisfies -4.14≦(R1+R2) / (R1-R2)≦-1.06. The shape of the first lens L1 is reasonably controlled to allow the first lens L1 to effectively correct the system spherical aberration. Preferably, the relationship satisfies -2.59≦(R1+R2) / (R1-R2)≦-1.33.

[0029] The axial thickness of the first lens L1 is d1, and the total optical length of the imaging optical lens 10 is TTL, and the relationship 0.06≦d1 / TTL≦0.21 is satisfied, which is advantageous for achieving ultra-thinness within the range of the relationship. Preferably, the relationship 0.10≦d1 / TTL≦0.16 is satisfied.

[0030] The object side surface of the second lens L2 is convex near the axis, and the image side surface is concave near the axis, and the second lens L2 has negative refractive power. The object side surface and the image side surface of the second lens L2 may have other concave and convex distribution patterns.

[0031] The focal length of the second lens L2 is defined as f2, and satisfies the relation: -15.86≦f2 / f≦-3.01. It is advantageous to correct the aberration of the optical system by controlling the negative optical focal power of the second lens L2 within a reasonable range. Preferably, it satisfies -9.91≦f2 / f≦-3.77.

[0032] The radius of curvature of the center of the object side surface of the second lens L2 is defined as R3, and the radius of curvature of the center of the image side surface of the second lens L2 is defined as R4, and the relationship satisfies 2.67≦(R3+R4) / (R3-R4)≦12.77. The shape of the second lens L2 is reasonably controlled to allow the second lens L2 to effectively correct the system spherical difference. Preferably, the relationship satisfies 4.27≦(R3+R4) / (R3-R4)≦10.22.

[0033] The axial thickness of the second lens L2 is d3, which satisfies the relational expression 0.02≦d3 / TTL≦0.05, and is advantageous for realizing ultra-thinning within the range of the relational expression, and preferably satisfies 0.03≦d3 / TTL≦0.04.

[0034] The object side surface of the third lens L3 is a convex or concave surface near the axis, the image side surface is a convex surface near the axis, and the third lens L3 has a positive refractive power. The image side surface of the third lens L3 may have other concave and convex distribution patterns.

[0035] The focal length of the third lens L3 is defined as f3, and satisfies the relationship: 3.47≦f3 / f≦24.78. With the reasonable distribution of optical focusing power, the system has better imaging quality and lower sensitivity. Preferably, it satisfies 5.55≦f3 / f≦19.82.

[0036] 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, which satisfies the relational expression of -0.25≦(R5+R6) / (R5-R6)≦1.61, defines the shape of the third lens L3, and within the range, it is favorable to correct the problem of axial chromatic aberration with the development of ultra-thin and wide-angle lenses.Preferably, it satisfies -0.16≦(R5+R6) / (R5-R6)≦1.29.

[0037] The axial thickness of the third lens L3 is d5, and the total optical length of the imaging optical lens is TTL, which satisfies the relational expression of 0.03≦d5 / TTL≦0.12, and is advantageous for realizing an ultra-thin structure within the range of the relational expression. Preferably, it satisfies 0.05≦d5 / TTL≦0.09.

[0038] The object side surface of the fourth lens L4 is convex near the axis, the image side surface is concave near the axis, and the fourth lens L4 has negative refractive power. The object side surface and the image side surface of the fourth lens L4 may have other concave and convex distribution patterns.

[0039] The focal length of the fourth lens L4 is defined as f4, and satisfies the relationship: -62.59≦f4 / f≦-2.51. Through the reasonable distribution of optical focusing power, the system has better imaging quality and lower sensitivity. Preferably, it satisfies -39.12≦f4 / f≦-3.14.

[0040] The on-axis thickness of the fourth lens L4 is d7, which satisfies the relational expression of 0.02≦d7 / TTL≦0.06, and is advantageous for realizing an ultra-thin structure within the range of the relational expression. Preferably, it satisfies 0.03≦d7 / TTL≦0.05.

[0041] The object side surface of the fifth lens L5 is a convex surface near the axis, the image side surface is a concave surface near the axis, and the fifth lens L5 has a positive refractive power or a negative refractive power. The object side surface and the image side surface of the fifth lens L5 may have other concave and convex distribution patterns.

[0042] The focal length of the fifth lens L5 is f5, which satisfies the relationship: -30.01≦f5 / f≦27.49. The limitation on the fifth lens L5 can effectively smooth the ray angle of the imaging optical lens 10 and reduce the tolerance sensitivity. Preferably, it satisfies -18.76≦f5 / f≦21.99.

[0043] The central radius of curvature of the object side surface of the fifth lens L5 is R9, and the central radius of curvature of the image side surface of the fifth lens L5 is R10, which satisfies the relational expression of -7.90≦(R9+R10) / (R9-R10)≦6.02, which defines the shape of the fifth lens L5 and is advantageous for correcting the astigmatism and distortion of the imaging optical lens 10 within the conditional range, and preferably satisfies -4.94≦(R9+R10) / (R9-R10)≦4.81.

[0044] The axial thickness of the fifth lens L5 is d9, which satisfies the relational expression of 0.04≦d9 / TTL≦0.13, and is advantageous for realizing ultra-thinning within the range of the relational expression, and preferably satisfies 0.06≦d9 / TTL≦0.10.

[0045] The object side surface of the sixth lens L6 is a convex surface near the axis, and the image side surface is a concave surface near the axis, and the sixth lens L6 has a positive refractive power. The object side surface and the image side surface of the sixth lens L6 may have other concave and convex distribution patterns.

[0046] The focal length of the sixth lens L6 is defined as f6, which satisfies the relationship of 0.46≦f6 / f≦1.71, and through the reasonable distribution of optical focusing power, the system has better imaging quality and lower sensitivity, preferably satisfies 0.74≦f6 / f≦1.37.

[0047] The radius of curvature of the center of the object side surface of the sixth lens L6 is R11, the radius of curvature of the center of the image side surface of the sixth lens L6 is R12, and the relational expression of -3.58≦(R11+R12) / (R11-R12)≦-1.11 is satisfied. The shape of the sixth lens L6 is defined, and if it is within the range of the relational expression, it is advantageous to correct problems such as aberrations of the off-axis angle of view with the progress of ultra-thin and wide-angle lenses. Preferably, it satisfies -2.24≦(R11+R12) / (R11-R12)≦-1.38.

[0048] The axial thickness d11 of the sixth lens L6 satisfies the relational expression of 0.04≦d11 / TTL≦0.13, which is advantageous for realizing an ultra-thin structure within the range of the relational expression, and preferably satisfies 0.06≦d11 / TTL≦0.10.

[0049] The object side surface of the seventh lens L7 is concave near the axis, the image side surface is concave near the axis, and the seventh lens L7 has negative refractive power. The object side surface and the image side surface of the seventh lens L7 may have other concave and convex distribution patterns.

[0050] The focal length of the photographing optical lens is defined as f, and the focal length of the seventh lens L7 is defined as f7, and the relationship between the focal length and the focal length of the seventh lens L7 is -1.41≦f7 / f≦-0.43 is satisfied. Through the reasonable distribution of the optical focusing power, the system has better imaging quality and lower sensitivity. Preferably, the relationship between the focal length and the focal length of the seventh lens L7 is satisfied.

[0051] The seventh lens L7 has an axial thickness of d13, which satisfies the relational expression 0.02≦d13 / TTL≦0.09, and is advantageous for achieving an ultra-thin structure within the range of the conditional expression. Preferably, it satisfies 0.03≦d13 / TTL≦0.07.

[0052] The image height of the imaging optical lens is IH, and by satisfying the relational expression TTL / IH≦1.29, an ultra-thin structure can be achieved.

[0053] The field of view FOV of the imaging optical lens is 82.98° or more, thereby achieving a wide angle.

[0054] The aperture value FNO of the photographic optical lens is 1.618 or less, which realizes a large aperture and improves the imaging performance of the photographic optical lens.

[0055] The photographic optical lens of the present invention will be described as an example. The symbols used in each example are as follows. The focal length, axial distance, central radius of curvature, axial thickness, inflection point position, and stationary point position are all in mm. TTL: total optical length (the axial distance from the object side of the first lens L1 to the image plane Si), in mm. Aperture value FNO: The ratio of the effective focal length to the entrance pupil diameter of the photographic optical lens.

[0056] The technical solution of the present invention will be specifically described below using five embodiments, and one comparative embodiment in which the technical effect of the present invention does not appear when the above conditional formula is exceeded is provided for reference.

[0057] First embodiment Tables 1 and 2 show design data for the imaging optical lens 10 according to the first embodiment of the present invention. Among them, the fifth lens L5 has a positive refractive power, and the object side surface of the third lens L3 is a convex surface near the axis. JPEG0007642132000002.jpg135154

[0058] Here, the meanings of each symbol are as follows: S1: Aperture. R: The radius of curvature at the center of the optical surface. R1: The central radius of curvature of the object side surface of the first lens L1. R2: The central radius of curvature of the image side surface of the first lens L1. R3: The central radius of curvature of the object side surface of the second lens L2. R4: The central radius of curvature of the image side surface of the second lens L2. R5: The central radius of curvature of the object side surface of the third lens L3. R6: The central radius of curvature of the image side surface of the third lens L3. R7: The central radius of curvature of the object side surface of the fourth lens L4. R8: The central radius of curvature of the image side surface of the fourth lens L4. R9: The central radius of curvature of the object side surface of the fifth lens L5. R10: The central radius of curvature of the image side surface of the fifth lens L5. R11: The central radius of curvature of the object side surface of the sixth lens L6. R12: The central radius of curvature of the image side surface of the sixth lens L6. R13: The central radius of curvature of the object side surface of the seventh lens L7. R14: The central radius of curvature of the image side surface of the seventh lens L7. R15: The central radius of curvature of the object side surface of the optical filter GF. R16: The central radius of curvature of the image side surface of the optical filter GF. d: Axial thickness of the lens, axial distance between the lenses. d0: The axial distance from the aperture stop S1 to the object side surface of the first lens L1. d1: the 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: the 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: the 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: The 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: The axial thickness of the fifth lens L5. d10: The axial distance from the image side surface of the fifth lens L5 to the object side surface of the sixth lens L6. d11: The axial thickness of the sixth lens L6. d12: The axial distance from the image side surface of the sixth lens L6 to the object side surface of the seventh lens L7. d13: The axial thickness of the seventh lens L7. d14: The axial distance from the image side surface of the seventh lens L7 to the object side surface of the optical filter GF. d15: The on-axis thickness of the optical filter GF. d16: The axial distance from the image side surface 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: the refractive index of the first lens L1 at the d line. nd2: The refractive index of the second lens L2 at the d line. nd3: the refractive index of the third lens L3 at the d line. nd4: The refractive index of the fourth lens L4 at the d line. nd5: The refractive index of the fifth lens L5 at the d line. nd6: The refractive index of the sixth lens L6 at the d line. nd7: The refractive index of the seventh lens L7 at the d line. ndg: the refractive index of the d line of the optical filter GF. νd: Abbe number. v1: the Abbe number of the first lens L1. v2: the Abbe number of the second lens L2. v3: the Abbe number of the third lens L3. v4: The Abbe number of the fourth lens L4. v5: Abbe number of the fifth lens L5. v6: Abbe number of the sixth lens L6. v7: Abbe number of the seventh lens L7. vg: Abbe number of the optical filter GF.

[0059] Table 2 shows the aspheric data of each lens in the imaging optical lens 10 according to the first embodiment of the present invention. JPEG0007642132000003.jpg225154JPEG0007642132000004.jpg133154

[0060] For convenience, the aspheric surface of each lens surface is expressed by the following formula (1): However, the present invention is not limited to the aspheric polynomial format expressed by this formula (1). z=(cr 2 ) / {1+[1-(k+1)(c 2 r 2 )] 1 / 2}+A4r 4 +A6r 6 +A8r 8 +A10r 10 +A12r 12 +A14r 14 +A16r 16 +A18r 18 +A20r 20 +A22r 22 +A24r 24 +A26r 26 +A28r 28 +A30r 30 (1) Here, k is the 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 from the optical axis on the aspheric surface to point r and a cutting plane tangent to the vertex of the aspheric surface on the optical axis).

[0061] Figures 2 and 3 are schematic diagrams showing the axial chromatic aberration and lateral chromatic aberration of light passing through the imaging optical lens 10 of the first embodiment at wavelengths of 656 nm, 588 nm, 546 nm, 486 nm, and 436 nm, respectively. Figure 4 is a schematic diagram showing the field curvature and distortion of light passing through the imaging optical lens 10 of the first embodiment at a wavelength of 546 nm, where the field curvature S in Figure 4 is the field curvature in the sagittal direction, and T is the field curvature in the meridian direction.

[0062] In this embodiment, the imaging optical lens 10 has an entrance pupil diameter ENPD of 3.306 mm, a full-field image height IH of 5.125 mm, and a diagonal field of view angle FOV of 85.50°. The imaging optical lens 10 satisfies the design requirements for a large aperture, a wide angle, and an ultra-thin shape, has on-axis and off-axis chromatic aberrations sufficiently corrected, and has excellent optical characteristics.

[0063] Second embodiment The meanings of the symbols in the second embodiment are the same as those in the first embodiment. A second embodiment of the imaging optical lens 20 of the present invention is shown in Figure 5. The fifth lens L5 has negative refractive power, and the object side surface of the third lens L3 is concave near the axis.

[0064] Tables 3 and 4 show design data for the imaging optical lens 20 according to the second embodiment of the present invention. JPEG0007642132000005.jpg135154

[0065] Table 4 shows the aspheric data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention. JPEG0007642132000006.jpg225154JPEG0007642132000007.jpg133154

[0066] Fig. 6 and Fig. 7 are schematic diagrams showing the axial chromatic aberration and lateral chromatic aberration of light having wavelengths of 656 nm, 588 nm, 546 nm, 486 nm, and 436 nm that pass through the imaging optical lens 20 of the second embodiment. Fig. 8 is a schematic diagram showing the field curvature and distortion when light having a wavelength of 546 nm passes through the imaging optical lens 20 of the second embodiment. In Fig. 8, the field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridian direction.

[0067] In this embodiment, the imaging optical lens 20 has an entrance pupil diameter ENPD of 3.493 mm, a full-field image height IH of 5.125 mm, and a diagonal field of view angle FOV of 82.98°. The imaging optical lens 20 satisfies the design requirements for a large aperture, a wide angle, and an ultra-thin shape, has on-axis and off-axis chromatic aberrations sufficiently corrected, and has excellent optical characteristics.

[0068] Third embodiment The meanings of the symbols in the third embodiment are the same as those in the first embodiment. A third embodiment of an imaging optical lens 30 according to the present invention is shown in FIG. Tables 5 and 6 show design data for the imaging optical lens 30 according to the third embodiment of the present invention. JPEG0007642132000008.jpg135154

[0069] Table 6 shows the aspheric data of each lens in the imaging optical lens 30 according to the third embodiment of the present invention. JPEG0007642132000009.jpg225154JPEG0007642132000010.jpg133154

[0070] Fig. 10 and Fig. 11 are schematic diagrams showing the axial chromatic aberration and the lateral chromatic aberration of light having wavelengths of 656 nm, 588 nm, 546 nm, 486 nm, and 436 nm that have passed through the imaging optical lens 30 of the third embodiment. Fig. 12 is a schematic diagram showing the field curvature and distortion of light having wavelength of 546 nm that has passed through the imaging optical lens 30 of the third embodiment. In Fig. 12, the field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridian direction.

[0071] In this embodiment, the imaging optical lens 30 has an entrance pupil diameter ENPD of 3.322 mm, a full-field image height IH of 5.125 mm, and a diagonal field of view angle FOV of 85.57°. The imaging optical lens 30 satisfies the design requirements for a large aperture, a wide angle, and an ultra-thin shape, has on-axis and off-axis chromatic aberrations sufficiently corrected, and has excellent optical characteristics.

[0072] Fourth embodiment The meanings of the symbols in the fourth embodiment are the same as those in the first embodiment. An imaging optical lens 40 according to a fourth embodiment of the present invention is shown in FIG. Tables 7 and 8 show design data for the imaging optical lens 40 according to the fourth embodiment of the present invention. JPEG0007642132000011.jpg154160

[0073] Table 8 shows the aspheric data of each lens in the imaging optical lens 40 according to the fourth embodiment of the present invention. JPEG0007642132000012.jpg225154JPEG0007642132000013.jpg133154

[0074] Fig. 14 and Fig. 15 are schematic diagrams showing the axial chromatic aberration and the lateral chromatic aberration of light passing through the imaging optical lens 40 of the fourth embodiment at wavelengths of 656 nm, 588 nm, 546 nm, 486 nm, and 436 nm, respectively. Fig. 16 is a schematic diagram showing the field curvature and distortion of light passing through the imaging optical lens 40 of the fourth embodiment at a wavelength of 546 nm. The field curvature S in Fig. 16 is the field curvature in the sagittal direction, and T is the field curvature in the meridian direction.

[0075] In this embodiment, the imaging optical lens 40 has an entrance pupil diameter ENPD of 3.213 mm, a full-field image height IH of 5.125 mm, and a diagonal field of view angle FOV of 87.41°. The imaging optical lens 40 satisfies the design requirements for a large aperture, a wide angle, and an ultra-thin shape, has on-axis and off-axis chromatic aberrations sufficiently corrected, and has excellent optical characteristics.

[0076] Fifth embodiment The meanings of the symbols in the fifth embodiment are the same as those in the first embodiment. An imaging optical lens 50 according to a fifth embodiment is shown in FIG. Tables 9 and 10 show the design data of the imaging optical lens 50 of the fifth embodiment. JPEG0007642132000014.jpg154160

[0077] Table 10 shows the aspheric data of each lens in the imaging optical lens 50 according to the fifth embodiment of the present invention. JPEG0007642132000015.jpg225154JPEG0007642132000016.jpg133154

[0078] Fig. 18 and Fig. 19 are schematic diagrams showing the axial chromatic aberration and the lateral chromatic aberration of light passing through the imaging optical lens 50 of the fifth embodiment at wavelengths of 656 nm, 588 nm, 546 nm, 486 nm, and 436 nm, respectively. Fig. 20 is a schematic diagram showing the field curvature and distortion of light passing through the imaging optical lens 50 of the fifth embodiment at a wavelength of 546 nm. The field curvature S in Fig. 20 is the field curvature in the sagittal direction, and T is the field curvature in the meridian direction.

[0079] In this embodiment, the imaging optical lens 50 has an entrance pupil diameter ENPD of 3.305 mm, a full-field image height IH of 5.125 mm, and a diagonal field of view angle FOV of 85.58°. The imaging optical lens 50 satisfies the design requirements for a large aperture, a wide angle, and an ultra-thin shape, has on-axis and off-axis chromatic aberrations sufficiently corrected, and has excellent optical characteristics.

[0080] Table 13 below shows the values ​​in which various numerical values ​​in each of the first, second, third, fourth and fifth embodiments correspond to the parameters defined in the conditional expressions.

[0081] Comparative embodiment The symbols in the comparative embodiment have the same meanings as those in the first embodiment. FIG. 21 shows an imaging optical lens 60 of a comparative embodiment. Tables 11 and 12 show the design data of the imaging optical lens 60 of the comparative embodiment. JPEG0007642132000017.jpg154160

[0082] Table 12 shows the aspheric data of each lens in the imaging optical lens 60 of the comparative embodiment. JPEG0007642132000018.jpg225154JPEG0007642132000019.jpg133154

[0083] 22 and 23 are schematic diagrams showing the longitudinal chromatic aberration and the lateral chromatic aberration of light having wavelengths of 656 nm, 588 nm, 546 nm, 486 nm, and 436 nm after passing through the imaging optical lens 60 of the comparative embodiment, respectively. Fig. 24 is a schematic diagram showing the field curvature and the distortion of light having wavelength of 546 nm after passing through the imaging optical lens 60 of the comparative embodiment. The field curvature S in Fig. 24 is the field curvature in the sagittal direction, and T is the field curvature in the meridian direction.

[0084] Table 13 below shows the numerical values ​​corresponding to each of the conditional expressions in the comparative embodiment for each of the conditional expressions. It is clear that the imaging optical lens 60 of the comparative embodiment, which does not satisfy the above conditional expression 0.95≦f1 / f≦1.25, affects the imaging quality.

[0085] In the comparative embodiment, the imaging optical lens 60 has an entrance pupil diameter ENPD of 3.056 mm, a full-field image height IH of 5.125 mm, and a diagonal field of view angle FOV of 85.98°, and the imaging optical lens 60 does not satisfy design requirements such as good optical performance, large aperture, wide angle, and ultra-thinness. JPEG0007642132000020.jpg121154

[0086] As will be understood by those skilled in the art, the above embodiments are specific embodiments for realizing the present invention, and in practical applications, various changes in form and details may be made thereto without departing from the spirit and scope of the present invention.

Claims

1. 1. An imaging optical lens, comprising: the imaging optical lens is composed of seven lenses in total, 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 positive refractive power, a fourth lens having negative refractive power, a fifth lens having refractive power, a sixth lens having positive refractive power, and a seventh lens having negative refractive power; the first lens has a focal length f1, the imaging optical lens has a focal length f, the first lens has an Abbe number v1, the seventh lens has a central radius of curvature of an object side surface R13, the seventh lens has a central radius of curvature of an image side surface R14, the second lens and the third lens have an axial distance d4, the third lens and the fourth lens have an axial distance d6, the sixth lens has a central radius of curvature of an object side surface R11, and the sixth lens has a central radius of curvature of an image side surface R12, and the following relational expressions are satisfied: 0.95≦f1 / f≦1.25, 60.00≦v1≦82.00, −4.00≦R13 / R14≦−1.00, 1.50≦d4 / d6≦5.00 -3.58≦(R11+R12) / (R11-R12)≦-1.

11.

2. 2. The imaging optical lens according to claim 1, wherein 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, and the following relational expression is satisfied: 2.00≦(R7+R8) / (R7-R8)≦20.

00.

3. an object side surface of the first lens is convex near an axis, and an image side surface of the first lens is concave near an axis; 2. The imaging optical lens according to claim 1, wherein 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, a total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: -4.14≦(R1+R2) / (R1-R2)≦-1.06, 0.06≦d1 / TTL≦0.

21.

4. an object side surface of the second lens is convex near an axis, and an image side surface of the second lens is concave near an axis; 2. The imaging optical lens according to claim 1, wherein a focal length of the second lens is f2, a central radius of curvature of an object side surface of the second lens is R3, a central radius of curvature of an image side surface of the second lens is R4, an axial thickness of the second lens is d3, and a total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: −15.86≦f2 / f≦−3.01, 2.67≦(R3+R4) / (R3-R4)≦12.77, 0.02≦d3 / TTL≦0.

05.

5. the image side surface of the third lens is convex near an axis; 2. The imaging optical lens according to claim 1, wherein a focal length of the third lens is f3, 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, a total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: 3.47≦f3 / f≦24.78, -0.25≦(R5+R6) / (R5-R6)≦1.61, 0.03≦d5 / TTL≦0.

12.

6. an object side surface of the fourth lens is convex near an axis, and an image side surface of the fourth lens is concave near an axis; 2. The imaging optical lens according to claim 1, wherein a focal length of the fourth lens is f4, an axial thickness of the fourth lens is d7, and a total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: −62.59≦f4 / f≦−2.51, 0.02≦d7 / TTL≦0.

06.

7. an object side surface of the fifth lens is convex near an axis, and an image side surface of the fifth lens is concave near an axis; 2. The imaging optical lens according to claim 1, wherein 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, a total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: −30.01≦f5 / f≦27.49, -7.90≦(R9+R10) / (R9-R10)≦6.02, 0.04≦d9 / TTL≦0.

13.

8. an object side surface of the sixth lens is convex near the axis, and an image side surface of the sixth lens is concave near the axis; 2. The imaging optical lens according to claim 1, wherein a focal length of the sixth lens is f6, an axial thickness of the sixth lens is d11, and a total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: 0.46≦f6 / f≦1.71, 0.04≦d11 / TTL≦0.

13.

9. an object-side surface of the seventh lens is concave near an axis, and an image-side surface of the seventh lens is concave near an axis; 2. The imaging optical lens according to claim 1, wherein a focal length of the seventh lens is f7, an axial thickness of the seventh lens is d13, and a total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: −1.41≦f7 / f≦−0.43, 0.02≦d13 / TTL≦0.

09.

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

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