Image capturing optical lens

Abstract

To provide an optical lens, in particular an image capturing optical lens.SOLUTION: An image capturing optical lens disclosed herein comprises seven lenses consisting of 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 negative refractive power, a sixth lens having positive refractive power, and a seventh lens having negative refractive power, and satisfies the following conditional expressions: 60.00≤v1≤82.00, 2.50≤R9 / R10≤30.00, 0.35≤d7 / d8≤1.00, and 3.00≤R12 / R11≤10.00, where ν1 represents an Abbe number of the first lens, R9 represents a central curvature radius of an object-side surface of the fifth lens, R10 represents a central curvature radius of an image-side surface of the fifth lens, d7 represents an optical axial thickness of the fourth lens, d8 represents an optical axial distance between the fourth lens and the fifth lens, R11 represents a central curvature radius of an object-side surface of the sixth lens, and R12 represents a central curvature radius of an image-side surface of the sixth lens.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 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 increasing demand for miniaturized imaging optical lenses. Furthermore, due to the shrinking pixel size of photoreceptors and the trend toward high-performance, thin, lightweight, and portable electronic devices, miniaturized imaging optical lenses with excellent imaging quality are becoming mainstream in the current market. To achieve good imaging quality, multi-plate lens structures are often adopted. With technological advances and increasingly diverse user needs, photoreceptor pixel areas are constantly shrinking, and system imaging quality requirements are constantly increasing. Consequently, seven-plate lens structures have gradually emerged in lens designs. There is a strong demand for wide-angle imaging lenses with excellent optical characteristics, compact size, and sufficient aberration correction. Summary of the Invention [Problem to be solved by the invention]

[0003] The present invention has been made in view of the above-mentioned 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 design, and an ultra-wide angle. [Means for solving the problem]

[0004] To achieve the above object, 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 negative refractive power, a sixth lens having positive refractive power, and a seventh lens having negative refractive power. wherein the Abbe number of the first lens is v1, 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 fourth lens is d7, the axial distance between the fourth lens and the fifth lens is d8, the central radius of curvature of the object-side surface of the sixth lens is R11, and the central radius of curvature of the image-side surface of the sixth lens is R12, and the following relations are satisfied: 60.00≦v1≦82.00, 2.50≦R9 / R10≦30.00, 0.35≦d7 / d8≦1.00, 3.00≦R12 / R11≦10.00.

[0005] Preferably, the focal length of the second lens is f2, and the focal length of the seventh lens is f7, and the relationship 8.00≦f2 / f7≦25.00 is satisfied.

[0006] Preferably, the object-side surface of the first lens is convex near an axis, and the image-side surface of the first lens is concave near the axis, the focal length of the first lens is f1, the focal length of the imaging optical lens is f, 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 relational expressions are satisfied: 0.56≦f1 / f≦1.82, −4.74≦(R1+R2) / (R1−R2)≦−1.38, and 0.06≦d1 / TTL≦0.20.

[0007] Preferably, the object-side surface of the second lens is convex near an axis, and the image-side surface of the second lens is concave near an axis, the focal length of the second lens is f2, the focal length of the imaging optical lens is f, 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 relational expressions are satisfied: -32.19≦f2 / f≦-3.84, 3.83≦(R3+R4) / (R3-R4)≦29.79, and 0.02≦d3 / TTL≦0.06.

[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 focal length of the imaging optical lens is f, 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: 3.37≦f3 / f≦18.36, 0.06≦(R5+R6) / (R5−R6)≦3.15, and 0.03≦d5 / TTL≦0.10.

[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 the axis, the focal length of the fourth lens is f4, the focal length of the imaging optical lens is f, 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, the axial thickness of the fourth lens is d7, and the total optical length of the imaging optical lens is TTL, and the following relational expressions are satisfied: -11.13≦f4 / f≦−2.75, 1.45≦(R7+R8) / (R7−R8)≦5.52, and 0.01≦d7 / TTL≦0.09.

[0010] Preferably, the object side surface of the fifth lens is convex near the axis, and the image side surface of the fifth lens is concave near the axis, the focal length of the fifth lens is f5, the focal length of the imaging optical lens is f, the axial thickness of the fifth lens is d9, and the total optical length of the imaging optical lens is TTL, and the relational expressions of -9.27≦f5 / f≦-1.05 and 0.04≦d9 / TTL≦0.14 are satisfied.

[0011] Preferably, the object side surface of the sixth lens is convex near the axis, and the image side surface of the sixth lens is concave near the axis, the focal length of the sixth lens is f6, the focal length of the imaging optical lens is f, the axial thickness of the sixth lens is d11, and the total optical length of the imaging optical lens is TTL, and the relational expressions of 0.33≦f6 / f≦1.34 and 0.04≦d11 / TTL≦0.13 are satisfied.

[0012] Preferably, the object-side surface of the seventh lens is concave near an axis, and the image-side surface of the seventh lens is concave near an axis, the focal length of the seventh lens is f, the focal length of the imaging optical lens is f, 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 thickness of the seventh lens is d13, and the total optical length of the imaging optical lens is TTL, and the following relational expressions are satisfied: -1.60≦f7 / f≦-0.44, -0.12≦(R13+R14) / (R13-R14)≦0.07, and 0.02≦d13 / TTL≦0.13.

[0013] Preferably, the first lens is made of glass. [Effects of the Invention]

[0014] The beneficial effects of the present invention are as follows: The imaging optical lens of the present invention has excellent optical properties, including 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 web applications that use imaging elements such as high-pixel CCDs and CMOSs. [Brief explanation 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. It is clear that the accompanying drawings described below are only some embodiments of the present invention, and other drawings of the present invention can be obtained by those skilled in the art without original work. [Figure 1] 1 is a schematic diagram illustrating the configuration of an imaging optical lens according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a schematic diagram of the longitudinal chromatic aberration of the imaging optical lens shown in FIG. [Figure 3] FIG. 2 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in FIG. [Figure 4] 2 is a schematic diagram of the field curvature and distortion of the imaging optical lens shown in FIG. 1. [Figure 5] FIG. 4 is a schematic diagram illustrating the configuration of an imaging optical lens according to a second embodiment of the present invention. [Figure 6] FIG. 6 is a schematic diagram of the longitudinal chromatic aberration of the imaging optical lens shown in FIG. 5. [Figure 7] FIG. 6 is a schematic diagram of chromatic aberration of magnification 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. 10 is a schematic diagram illustrating the configuration of an imaging optical lens according to a third embodiment of the present invention. [Figure 10] FIG. 10 is a schematic diagram of the longitudinal chromatic aberration of the imaging optical lens shown in FIG. [Figure 11] FIG. 10 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in FIG. [Figure 12] 10A and 10B are schematic diagrams of field curvature and distortion of the imaging optical lens shown in FIG. 9. [Figure 13] FIG. 10 is a schematic diagram illustrating the 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 axial chromatic aberration of the imaging optical lens shown in FIG. [Figure 15]FIG. 14 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in FIG. [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. 10 is a schematic diagram illustrating the configuration of an imaging optical lens according to a fifth embodiment of the present invention. [Figure 18] FIG. 18 is a schematic diagram of the longitudinal chromatic aberration of the imaging optical lens shown in FIG. [Figure 19] FIG. 18 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in FIG. [Figure 20] 18A and 18B are schematic diagrams of field curvature and distortion of the imaging optical lens shown in FIG. 17. [Figure 21] FIG. 10 is a schematic diagram of the configuration of an imaging optical lens according to a comparative embodiment. [Figure 22] FIG. 22 is a schematic diagram of the longitudinal chromatic aberration of the imaging optical lens shown in FIG. 21. [Figure 23] FIG. 22 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in FIG. 21. [Figure 24] 22A and 22B are schematic diagrams of field curvature and distortion of the imaging optical lens shown in FIG. 21. DETAILED DESCRIPTION OF THE INVENTION

[0016] In order to clarify the objectives, technical solutions and advantages of the present invention, the following embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, those skilled in the art will understand that in various embodiments of the present invention, many technical details are presented to enable readers to better understand the present invention. However, even without such technical details and various changes and modifications based on the following embodiments, the technical solutions claimed for protection of the present invention can also be realized.

[0017] Referring to the accompanying drawings, the technical solution of the present invention provides imaging optical lenses 10, 20, 30, 40, and 50. Figures 1, 5, 9, 13, and 17 show the imaging optical lenses 10, 20, 30, 40, and 50 of the present invention, which each include 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 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, although each lens may be made of other materials.

[0019] 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.

[0020] The Abbe number of the first lens L1 is defined as v1, which satisfies the relationship 60.00≦v1≦82.00 to define the Abbe number of the first lens L1. Within this range, the material properties are effectively allocated to effectively correct the chromatic aberration, and the chromatic aberration |LC|≦3.5 μm.

[0021] The central radius of curvature of the object-side surface of fifth lens L5 is defined as R9, and the central radius of curvature of the image-side surface of fifth lens L5 is defined as R10. The shape of the fifth lens is specified to satisfy the relationship 2.50≦R9 / R10≦30.00. Within this range, it is advantageous to correct astigmatism and distortion of the imaging optical lens, and the distortion |Distortion|≦3% is set, thereby reducing the possibility of dark angles occurring.

[0022] The axial thickness of the fourth lens is defined as d7, and the axial distance between the fourth lens and the fifth lens is defined as d8. These lenses satisfy the relationship 0.35≦d7 / d8≦1.00, which defines the range of the ratio between the center thickness of the fourth lens and the air gap between the fourth and fifth lenses, and helps to reduce the overall length of the optical system within the range of the conditional formula.

[0023] The sixth lens has a central radius of curvature R11 on its object side surface and a central radius of curvature R12 on its image side surface, satisfying the relational expression 3.00≦R12 / R11≦10.00. This defines the shape of the sixth lens, and within the range of this condition, is advantageous in reducing the degree of refraction of light rays passing through the lens and effectively reducing aberrations.

[0024] When the above several conditional expressions are satisfied, the imaging optical lenses 10, 20, 30, 40, and 50 have good optical performance and can satisfy design requirements for a large aperture, a wide angle, and an ultra-thin shape. These characteristics of the imaging optical lenses 10, 20, 30, 40, and 50 make them particularly suitable as imaging lens units for mobile phones and imaging lenses for web applications that 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 focal length of the second lens L2 is defined as f2, and the focal length of the seventh lens L7 is defined as f7, and the relationship 8.00≦f2 / f7≦25.00 is satisfied. The range of the ratio of the focal lengths of the second lens and the seventh lens is defined, and the optical focal lengths of the system are reasonably set, so that the system has better imaging quality and lower sensitivity.

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

[0028] The focal length of the imaging optical lens is defined as f, and the focal length of the first lens L1 is defined as f1. The relationship 0.56≦f1 / f≦1.82 is satisfied to define the range of the ratio between the focal length of the first lens L1 and the focal length of the imaging optical lens 10. Within this range, the amount of field curvature of the system can be effectively balanced. Preferably, the relationship 0.89≦f1 / f≦1.46 is satisfied.

[0029] 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 radius of curvature of the image-side surface of the first lens L1 satisfies the relationship -4.74≦(R1+R2) / (R1-R2)≦-1.38. The shape of the first lens L1 is reasonably controlled so that the first lens L1 can effectively correct the system spherical aberration. Preferably, the relationship satisfies -2.96≦(R1+R2) / (R1-R2)≦-1.73.

[0030] The axial thickness of the first lens L1 is d1, and the total optical length of the imaging optical lens 10 is TTL, which satisfies the relational expression 0.06≦d1 / TTL≦0.20, which is advantageous for achieving ultra-thinness within the range of the conditional expression, and preferably satisfies 0.10≦d1 / TTL≦0.16.

[0031] 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 and image side surfaces of the second lens L2 may have other concave / convex distribution patterns.

[0032] The focal length of the imaging optical lens is defined as f, and the focal length of the second lens L2 is defined as f2, and the relationship satisfies -32.19≦f2 / f≦-3.84. Controlling the negative optical focal power of the second lens L2 within a reasonable range is advantageous for correcting aberrations in the optical system. Preferably, the relationship satisfies -20.12≦f2 / f≦-4.80.

[0033] 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 they satisfy the relationship 3.83≦(R3+R4) / (R3-R4)≦29.79. The shape of the second lens L2 is reasonably controlled to allow the second lens L2 to effectively correct the system spherical aberration. Preferably, the relationship 6.12≦(R3+R4) / (R3-R4)≦23.83 is satisfied.

[0034] The axial thickness of the second lens L2 is d3, and the total optical length of the imaging optical lens is TTL, which satisfies the relational expression 0.02≦d3 / TTL≦0.06, which is advantageous for achieving an ultra-thin structure within the range of the conditional expression, and preferably satisfies 0.03≦d3 / TTL≦0.05.

[0035] The object side surface of the third lens L3 is convex or concave near the axis, the image side surface is convex near the axis, and the third lens L3 has positive refractive power. The object side and image side surfaces of the third lens L3 may have other concave / convex distribution patterns.

[0036] The focal length of the photographing optical lens is defined as f, and the focal length of the third lens L3 is defined as f3, and the relationship must satisfy 3.37≦f3 / f≦18.36. By rationally allocating the optical focusing power, the system can achieve better imaging quality and lower sensitivity. Preferably, the relationship must satisfy 5.39≦f3 / f≦14.69.

[0037] 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 relationship 0.06≦(R5+R6) / (R5-R6)≦3.15, defining the shape of the third lens L3. When within this range, it is advantageous for correcting axial chromatic aberration as lenses become thinner and wider in angle of view. Preferably, the relationship 0.10≦(R5+R6) / (R5-R6)≦2.52 is satisfied.

[0038] The axial thickness of the third lens L3 is d5, and the total optical length of the imaging optical lens is TTL, satisfying the relational expression 0.03≦d5 / TTL≦0.10. Within the range of this conditional expression, this is advantageous for achieving an ultra-thin design. Preferably, the relation 0.04≦d5 / TTL≦0.08 is satisfied.

[0039] 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 and image side surfaces of the fourth lens L4 may have other concave / convex distribution patterns.

[0040] The focal length of the photographic lens is defined as f, and the focal length of the fourth lens L4 is defined as f4. The relationship is -11.13≦f4 / f≦-2.75. By rationally allocating the optical focusing power, the system achieves better imaging quality and lower sensitivity. Preferably, the relationship is -6.95≦f4 / f≦-3.44.

[0041] The central radius of curvature of the object-side surface of fourth lens L4 is R7, and the central radius of curvature of the image-side surface of fourth lens L4 is R8, which satisfy the relationship 1.45≦(R7+R8) / (R7-R8)≦5.52, which defines the shape of fourth lens L4. If this range is met, it is advantageous for correcting axial chromatic aberration problems as lenses become thinner and wider in angle of view. Preferably, the relationship 2.33≦(R7+R8) / (R7-R8)≦4.41 is satisfied.

[0042] The axial thickness of the fourth lens L4 is d7, and the total optical length of the imaging optical lens 10 is TTL, satisfying the relational expression 0.01≦d7 / TTL≦0.09. Within the range of this conditional expression, this is advantageous for achieving an ultra-thin design. Preferably, the relation 0.02≦d7 / TTL≦0.07 is satisfied.

[0043] The object side surface of the fifth lens L5 is convex near the axis, the image side surface is concave near the axis, and the fifth lens L5 has negative refractive power. The object side and image side surfaces of the fifth lens L5 may have other concave / convex distribution patterns.

[0044] The focal length of the imaging optical lens 10 is f, and the focal length of the fifth lens L5 is f5, which satisfies the relationship -9.27≦f5 / f≦-1.05. The restriction on the fifth lens L5 effectively smooths the ray angle of the imaging optical lens 10 and reduces tolerance sensitivity. Preferably, the relationship satisfies -5.79≦f5 / f≦-1.32.

[0045] The axial thickness of the fifth lens L5 is d9, and the total optical length of the imaging optical lens 10 is TTL, satisfying the relational expression 0.04≦d9 / TTL≦0.14. Within the range of this conditional expression, this is advantageous for achieving an ultra-thin design. Preferably, the relation 0.06≦d9 / TTL≦0.11 is satisfied.

[0046] The object side surface of the sixth lens L6 is convex near the axis, the image side surface is concave near the axis, and the sixth lens L6 has positive refractive power. The object side and image side surfaces of the sixth lens L6 may have other concave / convex distribution patterns.

[0047] The focal length of the photographing optical lens is defined as f, and the focal length of the sixth lens L6 is defined as f6. The relationship 0.33≦f6 / f≦1.34 is satisfied, and the system has better imaging quality and lower sensitivity due to the rational distribution of optical focusing power. Preferably, the relationship 0.53≦f6 / f≦1.07 is satisfied.

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

[0049] The seventh lens L7 has a concave object-side surface near the axis, a concave image-side surface near the axis, and a negative refractive power. The seventh lens L7 may have other concave / convex distributions on the object-side and image-side surfaces.

[0050] The focal length of the photographic optical lens is defined as f, and the focal length of the seventh lens L7 is defined as f7. The relationship between f7 / f and f7 is -1.60≦f7 / f≦-0.44. The rational distribution of optical focusing power ensures the system has better imaging quality and lower sensitivity. Preferably, the relationship between f7 / f and f is -1.00≦f7 / f≦-0.55.

[0051] The central radius of curvature of the object-side surface of seventh lens L7 is R13, the central radius of curvature of the image-side surface of seventh lens L7 is R14, and the relationship -0.12≦(R13+R14) / (R13-R14)≦0.07 is satisfied, defining the shape of seventh lens L7. If this relationship is within this range, it is advantageous for correcting aberrations in the off-axial angle of view as ultra-thin lenses and wide-angle lenses become more common. Preferably, the relationship -0.08≦(R13+R14) / (R13-R14)≦0.06 is satisfied.

[0052] The seventh lens L7 has an axial thickness of d13, and the total optical length of the imaging optical lens 10 is TTL, satisfying the relational expression 0.02≦d13 / TTL≦0.13. This conditional expression is advantageous for achieving an ultra-thin design. Preferably, the condition 0.03≦d13 / TTL≦0.10 is satisfied.

[0053] The image height of the imaging optical lens is IH, and the total optical length of the imaging optical lens 10 is TTL, satisfying the relation TTL / IH≦1.31, which is advantageous for achieving an ultra-thin design. Preferably, it satisfies TTL / IH≦1.25.

[0054] The imaging optical lens has a field of view FOV of 84.14° or more, which provides a wide angle, and preferably has a field of view FOV of 85.86° or more.

[0055] The aperture value FNO of the photographic optical lens is 1.64 or less, which realizes a large aperture and provides good imaging performance of the photographic optical lens. Preferably, the aperture value FNO of the photographic optical lens is 1.60 or less.

[0056] The photographic optical lens of the present invention will be used as an example for explanation. The symbols used in each example are as follows: 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 (axial distance from the object side of the first lens L1 to the image plane Si), unit is mm. Aperture value FNO: The ratio of the effective focal length to the entrance pupil diameter of the photographic optical lens.

[0057] Next, five embodiments are used to specifically explain the technical solution of the present invention, and a comparative embodiment is provided for reference, which shows that the technical effect of the present invention cannot be obtained when the range of the above conditional formula is exceeded.

[0058] First embodiment Tables 1 and 2 show design data for the imaging optical lens 10 according to the first embodiment of the present invention. JPEG2025121355000002.jpg145165

[0059] Here, the meaning of each symbol is as follows: S1: Aperture. R: Radius of curvature at the center of the optical surface. R1: The radius of curvature of the center of the object side surface of the first lens L1. R2: The radius of curvature of the center of the image side surface of the first lens L1. R3: The radius of curvature of the center of the object side surface of the second lens L2. R4: The radius of curvature of the center of the image side surface of the second lens L2. R5: The radius of curvature of the center 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 radius of curvature of the center 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 radius of curvature of the center of the image side surface of the fifth lens L5. R11: The radius of curvature of the center of the object side surface of the sixth lens L6. R12: The radius of curvature of the center of the image side of the sixth lens L6. R13: The radius of curvature of the center of the object side of the seventh lens L7. R14: The radius of curvature of the center of the image side of the seventh lens L7. R15: The radius of curvature of the center of the object side 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 axial 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: Abbe number of the first lens L1. v2: Abbe number of the second lens L2. v3: Abbe number of the third lens L3. v4: Abbe number of the fourth lens L4. v5: Abbe number of the fifth lens L5. v6: Abbe number of the sixth lens L6. v7: Abbe number of the seventh lens L7. vg: Abbe number of the optical filter GF.

[0060] Table 2 shows the aspheric surface data of each lens in the imaging optical lens 10 according to the first embodiment of the present invention. JPEG2025121355000003.jpg237162JPEG2025121355000004.jpg141162

[0061] For convenience, the aspherical surface of each lens surface is expressed by the following formula (1): However, the present invention is not limited to the aspherical 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 between a point on the aspheric surface r from the optical axis and a cutting plane tangent to the vertex of the aspheric surface on the optical axis).

[0062] 2 and 3 are schematic diagrams showing the axial chromatic aberration and lateral chromatic aberration of light at wavelengths of 656 nm, 610 nm, 555 nm, 510 nm, and 470 nm that have passed through the imaging optical lens 10 of the first embodiment. Fig. 4 is a schematic diagram showing the field curvature and distortion of light at a wavelength of 555 nm that has passed through the imaging optical lens 10 of the first embodiment, where the field curvature S in Fig. 4 is the field curvature in the sagittal direction and T is the field curvature in the meridional direction.

[0063] In this embodiment, the imaging optical lens 10 has an entrance pupil diameter ENPD of 4.001 mm, a full-field image height IH of 6.129 mm, and a diagonal field of view FOV of 86.45°. The imaging optical lens 10 satisfies the design requirements for a large aperture, a wide angle, and an ultra-thin design, and has excellent optical characteristics with sufficient correction of on-axis and off-axis chromatic aberrations.

[0064] Second embodiment The meanings of the symbols in the second embodiment are the same as those in the first embodiment. FIG. 5 shows an imaging optical lens 20 according to a second embodiment of the present invention. Tables 3 and 4 show design data for the imaging optical lens 20 according to the second embodiment of the present invention. JPEG2025121355000005.jpg145165

[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. JPEG2025121355000006.jpg237162JPEG2025121355000007.jpg141162

[0066] 6 and 7 are schematic diagrams showing the axial chromatic aberration and lateral chromatic aberration of light at wavelengths of 656 nm, 610 nm, 555 nm, 510 nm, and 470 nm that have passed through the imaging optical lens 20 of the second embodiment. Fig. 8 is a schematic diagram showing the field curvature and distortion of light at a wavelength of 555 nm that has passed 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 meridional direction.

[0067] In this embodiment, the imaging optical lens 20 has an entrance pupil diameter ENPD of 3.909 mm, a full field of view image height IH of 6.129 mm, and a diagonal field of view angle FOV of 87.78°. The imaging optical lens 20 satisfies the design requirements for a large aperture, a wide angle, and an ultra-thin design, and has sufficient correction for on-axis and off-axis chromatic aberrations and excellent optical characteristics.

[0068] Third embodiment The symbols in the third embodiment have the same meanings as those in the first embodiment. FIG. 9 shows an imaging optical lens 30 according to a third embodiment of the present invention. Tables 5 and 6 show design data for the imaging optical lens 30 according to the third embodiment of the present invention. JPEG2025121355000008.jpg145165

[0069] 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. JPEG2025121355000009.jpg237162JPEG2025121355000010.jpg141162

[0070] 10 and 11 are schematic diagrams showing the axial chromatic aberration and lateral chromatic aberration of light at wavelengths of 656 nm, 610 nm, 555 nm, 510 nm, and 470 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 at a wavelength of 555 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 meridional direction.

[0071] In this embodiment, the imaging optical lens 30 has an entrance pupil diameter ENPD of 4.031 mm, a full field of view image height IH of 6.129 mm, and a diagonal field of view angle FOV of 85.86°. The imaging optical lens 30 satisfies the design requirements for a large aperture, a wide angle, and an ultra-thin design, and has sufficient correction for on-axis and off-axis chromatic aberrations and excellent optical characteristics.

[0072] Fourth embodiment The meanings of the symbols in the fourth embodiment are the same as those in the first embodiment. FIG. 13 shows an imaging optical lens 40 according to a fourth embodiment of the present invention. Tables 7 and 8 show design data for the imaging optical lens 40 according to the fourth embodiment of the present invention. JPEG2025121355000011.jpg145165

[0073] 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. JPEG2025121355000012.jpg237162JPEG2025121355000013.jpg141162

[0074] 14 and 15 are schematic diagrams showing the axial chromatic aberration and lateral chromatic aberration of light at wavelengths of 656 nm, 610 nm, 555 nm, 510 nm, and 470 nm that have passed through the imaging optical lens 40 of the fourth embodiment. Fig. 16 is a schematic diagram showing the field curvature and distortion of light at a wavelength of 555 nm that has passed through the imaging optical lens 40 of the fourth embodiment. In Fig. 16, the field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0075] In this embodiment, the imaging optical lens 40 has an entrance pupil diameter ENPD of 3.916 mm, a full field of view image height IH of 6.129 mm, and a diagonal field of view angle FOV of 87.62°. The imaging optical lens 40 satisfies the design requirements for a large aperture, a wide angle, and an ultra-thin design, and has sufficient correction for on-axis and off-axis chromatic aberrations and excellent optical characteristics.

[0076] Fifth embodiment The meanings of the symbols in the fifth embodiment are the same as those in the first embodiment. FIG. 17 shows an imaging optical lens 50 according to a fifth embodiment of the present invention. Tables 9 and 10 show design data for the imaging optical lens 50 according to the fifth embodiment of the present invention. JPEG2025121355000014.jpg145165

[0077] Table 10 shows the aspheric surface data of each lens in the imaging optical lens 50 according to the fifth embodiment of the present invention. JPEG2025121355000015.jpg237162JPEG2025121355000016.jpg141162

[0078] 18 and 19 are schematic diagrams showing the axial chromatic aberration and lateral chromatic aberration of light having wavelengths of 656 nm, 610 nm, 555 nm, 510 nm, and 470 nm that pass through the imaging optical lens 50 of the fifth embodiment. Fig. 20 is a schematic diagram showing the field curvature and distortion when light having a wavelength of 555 nm passes through the imaging optical lens 50 of the fifth embodiment. In Fig. 20, the field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0079] In this embodiment, the imaging optical lens 50 has an entrance pupil diameter ENPD of 3.971 mm, a full field of view image height IH of 6.129 mm, and a diagonal field of view angle FOV of 87.31°. The imaging optical lens 50 satisfies the design requirements for a large aperture, a wide angle, and an ultra-thin design, and has sufficient correction for on-axis and off-axis chromatic aberrations and excellent optical characteristics.

[0080] Table 13 below shows the values in each of the first, second, third, fourth and fifth embodiments corresponding 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. JPEG2025121355000017.jpg145165

[0082] Table 12 shows the aspheric data of each lens in the imaging optical lens 60 of the comparative embodiment. JPEG2025121355000018.jpg230162JPEG2025121355000019.jpg148162

[0083] 22 and 23 show schematic diagrams of the axial chromatic aberration and lateral chromatic aberration of light with wavelengths of 656 nm, 610 nm, 555 nm, 510 nm, and 470 nm after passing through the imaging optical lens 60 of the comparative embodiment. Fig. 24 shows schematic diagrams of the field curvature and distortion of light with wavelength of 555 nm after passing through the imaging optical lens 60 of the comparative embodiment. In Fig. 24, the field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0084] Table 13 shows the numerical values corresponding to each condition in the comparative embodiment according to the above condition. Clearly, the imaging optical lens 60 of the comparative embodiment does not satisfy the above condition 60.00≦v1≦82.00, and the color difference is large.

[0085] In the comparative embodiment, the imaging optical lens 60 has an entrance pupil diameter ENPD of 3.931 mm, a full-field image height IH of 6.129 mm, and a diagonal field of view FOV of 86.40°, and the imaging optical lens 60 does not satisfy design requirements such as good optical performance, a large aperture, a wide angle, and an ultra-thin design. JPEG2025121355000020.jpg141160

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

Claims

1. 1. An imaging optical lens, comprising: the imaging optical lens includes 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 positive refractive power, a fourth lens having negative refractive power, a fifth lens having negative refractive power, a sixth lens having positive refractive power, and a seventh lens having negative refractive power; wherein the Abbe number of the first lens is v1, 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 fourth lens is d7, the axial distance between the fourth lens and the fifth lens is d8, the central radius of curvature of the object-side surface of the sixth lens is R11, and the central radius of curvature of the image-side surface of the sixth lens is R12, and the imaging optical lens satisfies the following relational expressions: 60.00≦v1≦82.00, 2.50≦R9 / R10≦30.00, 0.35≦d7 / d8≦1.00, 3.00≦R12 / R11≦10.

00.

2. 2. The imaging optical lens according to claim 1, wherein the focal length of the second lens is f2, the focal length of the seventh lens is f7, and the following relation is satisfied: 8.00≦f2 / f7≦25.

00.

3. an object-side surface of the first lens is a convex surface near an axis, and an image-side surface of the first lens is a concave surface near the axis; 2. The imaging optical lens according to claim 1, wherein a focal length of the first lens is f1, a focal length of the imaging optical lens is f, a central radius of curvature of an object-side surface of the first lens is R1, a central radius of curvature of an image-side surface of the first lens is R2, an axial thickness of the first lens is d1, and a total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: 0.56≦f1 / f≦1.82, -4.74≦(R1+R2) / (R1-R2)≦-1.38, 0.06≦d1 / TTL≦0.

20.

4. an object-side surface of the second lens is a convex surface near an axis, and an image-side surface of the second lens is a concave surface near the axis; 2. The imaging optical lens according to claim 1, wherein a focal length of the second lens is f2, a focal length of the imaging optical lens is f, 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: −32.19≦f2 / f≦−3.84, 3.83≦(R3+R4) / (R3-R4)≦29.79, 0.02≦d3 / TTL≦0.

06.

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 focal length of the imaging optical lens is f, a central radius of curvature of an object-side surface of the third lens is R5, a central radius of curvature of an image-side surface of the third lens is R6, an axial thickness of the third lens is d5, and a total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: 3.37≦f3 / f≦18.36, 0.06≦(R5+R6) / (R5-R6)≦3.15, 0.03≦d5 / TTL≦0.

10.

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 the axis; 2. The imaging optical lens according to claim 1, wherein a focal length of the fourth lens is f4, a focal length of the imaging optical lens is f, a central radius of curvature of an object-side surface of the fourth lens is R7, a central radius of curvature of an image-side surface of the fourth lens is R8, an axial thickness of the fourth lens is d7, and a total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: −11.13≦f4 / f≦−2.75, 1.45≦(R7+R8) / (R7-R8)≦5.52, 0.01≦d7 / TTL≦0.

09.

7. an object-side surface of the fifth lens is a convex surface near an axis, and an image-side surface of the fifth lens is a concave surface near the axis; 2. The imaging optical lens according to claim 1, wherein a focal length of the fifth lens is f5, a focal length of the imaging optical lens is f, an axial thickness of the fifth lens is d9, and a total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: −9.27≦f5 / f≦−1.05, 0.04≦d9 / TTL≦0.

14.

8. an object-side surface of the sixth lens is convex near an 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, a focal length of the imaging optical lens is f, 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: 0.33≦f6 / f≦1.34, 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, a focal length of the imaging optical lens is f, a central radius of curvature of an object-side surface of the seventh lens is R13, a central radius of curvature of an image-side surface of the seventh lens is R14, an axial thickness of the seventh lens is d13, and a total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: −1.60≦f7 / f≦−0.44, -0.12≦(R13+R14) / (R13-R14)≦0.07, 0.02≦d13 / TTL≦0.

13.

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

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