Imaging optical lens

Abstract

To provide an imaging optical lens in the technical field of optical lenses.SOLUTION: The imaging optical lens includes, from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The focal length of the imaging optical lens is defined as f; the focal length of the first lens is defined as f1; the on-axis thickness of the second lens is defined as d3; the on-axis distance from the image-side surface of the second lens to the object-side surface of the third lens is defined as d4; the curvature radius of the object-side surface of the second lens is defined as R3; the curvature radius of the image-side surface of the second lens is defined as R4; the curvature radius of the object-side surface of the fourth lens is defined as R7; and the curvature radius of the image-side surface of the fourth lens is defined as R8, and then the following relational expressions are satisfied: 1.10≤f1 / f≤1.60, 1.50≤d3 / d4≤3.50, -8.00≤R7 / R8≤-4.00, and 1.00≤(R3+R4) / (R3-R4)≤1.80. The imaging optical lens has good optical performance such as a large aperture, a wide angle and ultra-thinness.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] With the development of imaging technology, imaging optical lenses are widely applied to various electronic products, such as smartphones, digital cameras, etc. In order to facilitate portability, there is an increasing demand for electronic products to be made thinner, so that miniaturized imaging optical lenses with good imaging quality have become the mainstream of the current market.

[0003] In order to obtain good imaging quality, the conventional lenses installed in mobile phone cameras often use a three- or four-lens structure. In addition, with the development of technology and the increasing diversification needs of users, the pixel area of ​​the photosensitive element is shrinking and the system requirements for imaging quality are increasing, and five-lens structures are gradually appearing in lens design. Although the ordinary five-lens has good optical performance, its refractive power, the distance between the lenses and the lens shape still have some irrationality, so that even if the lens structure has good optical performance, it cannot meet the design requirements of large diameter, wide angle and ultra-thin.

[0004] Therefore, it is necessary to provide an imaging optical lens that has good optical performance and meets the design requirements of a large aperture, a wide angle, and an extremely thin design. Summary of the Invention [Problem to be solved by the invention]

[0005] In view of the above problems, an object of the present invention is to provide an imaging optical lens that has good optical performance and simultaneously satisfies design requirements for a large aperture, an extremely thin lens, and a wide angle lens. [Means for solving the problem]

[0006] In order to solve the above technical problem, an embodiment of the present invention provides an imaging optical lens, which is composed of, in order from the object side to the image side, a first lens having positive refractive power, a second lens having negative refractive power, a third lens having refractive power, a fourth lens having positive refractive power, and a fifth lens having negative refractive power, When a focal length of the imaging optical lens is f, a focal length of the first lens is f1, an axial thickness of the second lens is d3, an axial distance from the image side surface of the second lens to the object side surface of the third lens is d4, a radius of curvature of the object side surface of the second lens is R3, a radius of curvature of the image side surface of the second lens is R4, a radius of curvature of the object side surface of the fourth lens is R7, and a radius of curvature of the image side surface of the fourth lens is R8, the following conditional formulas (1) to (4) are satisfied. 1.10≦f1 / f≦1.60 (1) 1.50≦d3 / d4≦3.50 (2) -8.00≦R7 / R8≦-4.00 (3) 1.00≦(R3+R4) / (R3−R4)≦1.80 (4)

[0007] It is preferable that, when the focal length of the second lens is f2, the following conditional expression (5) is satisfied: -4.50≦f2 / f≦-1.40 (5)

[0008] Preferably, when the optical length of the imaging optical lens is TTL and the axial thickness of the fifth lens is d9, the following conditional expression (6) is satisfied. 6.00≦TTL / d9≦20.00 (6)

[0009] Preferably, the object side surface of the first lens is a paraxially convex surface, and the image side surface of the first lens is a paraxially concave surface, When the radius of curvature of the object side surface of the first lens is R1, the radius of curvature of the image side surface of the first lens is R2, the optical length of the imaging optical lens is TTL, and the axial thickness of the first lens is d1, the following conditional expressions (7) and (8) are satisfied. -2.42≦(R1+R2) / (R1-R2)≦-1.97 (7) 0.06≦d1 / TTL≦0.11 (8)

[0010] Preferably, the object side surface of the second lens is a convex surface in a paraxial direction, and the image side surface of the second lens is a concave surface in a paraxial direction, When the optical length of the imaging optical lens is TTL and the axial thickness of the second lens is d3, the following conditional expression (9) is satisfied. 0.03≦d3 / TTL≦0.06 (9)

[0011] Preferably, the object side surface of the third lens is a paraxially convex surface, and the image side surface of the third lens is a paraxially concave surface, When the focal length of the third lens is f3, the radius of curvature of the object side surface of the third lens is R5, the radius of curvature of the image side surface of the third lens is R6, the optical length of the imaging optical lens is TTL, and the axial thickness of the third lens is d5, the following conditional expressions (10) to (12) are satisfied. -109.81≦f3 / f≦77.62 (10) -29.33≦(R5+R6) / (R5−R6)≦25.94 (11) 0.10≦d5 / TTL≦0.13 (12)

[0012] Preferably, an object side surface of the fourth lens is a convex surface in a paraxial direction, and an image side surface of the fourth lens is a convex surface in a paraxial direction, When the focal length of the fourth lens is f4, the radius of curvature of the object side surface of the fourth lens is R7, the radius of curvature of the image side surface of the fourth lens is R8, the optical length of the imaging optical lens is TTL, and the axial thickness of the fourth lens is d7, the following conditional formulas (13) to (15) are satisfied. 0.52≦f4 / f≦0.63 (13) 0.60≦(R7+R8) / (R7−R8)≦0.71 (14) 0.15≦d7 / TTL≦0.21 (15)

[0013] Preferably, the object side surface of the fifth lens is a convex surface in a paraxial direction, and the image side surface of the fifth lens is a concave surface in a paraxial direction, When the focal length of the fifth lens is f5, the radius of curvature of the object side surface of the fifth lens is R9, and the radius of curvature of the image side surface of the fifth lens is R10, the following conditional expressions (16) and (17) are satisfied. -0.66≦f5 / f≦-0.55 (16) 1.56≦(R9+R10) / (R9−R10)≦1.79 (17)

[0014] Preferably, when the angle of view of the imaging optical lens is taken as FOV, the following conditional expression (18) is satisfied: FOV≧75.00° (18)

[0015] Preferably, the radius of the object side surface of said first lens is 0.85 mm or less. Effect of the Invention

[0016] The beneficial effects of the present invention are as follows: The imaging optical lens provided by the present invention has good optical performance and at the same time meets the design requirements for wide-angle and ultra-thin, and is particularly applicable to imaging lens units of mobile phones and WEB imaging lenses configured with imaging elements such as CCD and CMOS for high pixel counts.

[0017] In order to more clearly explain the technical solutions of the embodiments of the present invention, the following briefly introduces drawings required for the embodiments. Obviously, the drawings described below are only some embodiments of the present invention, and those skilled in the art can further obtain other drawings based on these drawings without any creative work. [Brief description of the drawings]

[0018] [Figure 1] 1 is a schematic diagram showing a configuration of an imaging optical lens according to a first embodiment of the present invention. [Diagram 2] 2 is a schematic diagram showing the field curvature and distortion of the imaging optical lens shown in FIG. [Diagram 3]2 is a schematic diagram showing chromatic aberration of magnification of the imaging optical lens shown in FIG. [Figure 4] 2 is a schematic diagram showing axial chromatic aberration of the imaging optical lens shown in FIG. [Diagram 5] FIG. 4 is a schematic diagram showing the configuration of an imaging optical lens according to a second embodiment of the present invention. [Figure 6] 6 is a schematic diagram showing the field curvature and distortion of the imaging optical lens shown in FIG. 5. [Figure 7] 6 is a schematic diagram showing chromatic aberration of magnification of the imaging optical lens shown in FIG. 5. [Figure 8] 6 is a schematic diagram showing the longitudinal chromatic aberration of the imaging optical lens shown in FIG. 5. [Figure 9] FIG. 11 is a schematic diagram showing the configuration of an imaging optical lens according to a third embodiment of the present invention. [Figure 10] 10A and 10B are schematic diagrams showing the field curvature and distortion of the imaging optical lens shown in FIG. [Figure 11] 10 is a schematic diagram showing chromatic aberration of magnification of the imaging optical lens shown in FIG. [Figure 12] 10 is a schematic diagram showing the longitudinal chromatic aberration of the imaging optical lens shown in FIG. [Figure 13] FIG. 11 is a schematic diagram showing the configuration of an imaging optical lens according to a fourth embodiment of the present invention. [Figure 14] 14 is a schematic diagram showing the field curvature and distortion of the imaging optical lens shown in FIG. 13. [Figure 15] 14 is a schematic diagram showing chromatic aberration of magnification of the imaging optical lens shown in FIG. 13. [Figure 16] 14 is a schematic diagram showing the longitudinal chromatic aberration of the imaging optical lens shown in FIG. 13. [Figure 17] FIG. 2 is a schematic diagram showing a configuration of an imaging optical lens according to a comparative example of the present invention. [Figure 18] 18A to 18C are schematic diagrams showing the field curvature and distortion of the imaging optical lens shown in FIG. 17. [Figure 19] 18 is a schematic diagram showing chromatic aberration of magnification of the imaging optical lens shown in FIG. 17. [Figure 20] 18 is a schematic diagram showing the longitudinal chromatic aberration of the imaging optical lens shown in FIG. 17. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] In order to make the object, solution and advantages of the present invention clearer, the following describes each embodiment of the present invention in detail with reference to the drawings. It can be understood by those skilled in the art that many technical details are described in each embodiment of the present invention to better understand the present invention. However, although many technical details are given in each embodiment of the present invention to make the present invention well understood, it should be understood by those skilled in the art that the present invention can be realized without the existence of those technical details and various changes and modifications based on the following embodiments.

[0020] (First embodiment) As shown in Fig. 1, a first embodiment of the present invention provides an imaging optical lens 10. The imaging optical lens 10 is composed of a total of five lenses. Specifically, the imaging optical lens 10 includes, in order from the image side to the object side, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5.

[0021] In this embodiment, the first lens L1 is made of a plastic material, the second lens L2 is made of a plastic material, the third lens L3 is made of a plastic material, the fourth lens L4 is made of a plastic material, and the fifth lens L5 is made of a plastic material. In other optional embodiments, each lens may be made of other materials. By rationally arranging the lens materials, the lenses have good optical performance.

[0022] In this embodiment, the focal length of the imaging optical lens 10 is defined as f, the focal length of the first lens L1 as f1, and the conditional expression 1.10≦f1 / f≦1.60 is satisfied, thereby defining the ratio between the focal length f of the first lens L1 and the imaging optical lens 10, and making it possible to effectively balance the spherical aberration and the amount of field curvature of the system within the range defined by the conditional expression.

[0023] In this embodiment, the axial thickness of the second lens L2 is defined as d3, the axial distance from the image side surface of the second lens L2 to the object side surface of the third lens L3 is defined as d4, and the ratio of the axial thickness of the second lens L2 to the air gap between the second lens and the third lens L3 is defined by satisfying 1.50≦d3 / d4≦3.50, which contributes to shortening the overall length of the optical system within the range defined by the conditional formula, and can achieve the effect of extremely thinning. Preferably, the ratio satisfies 1.85≦d3 / d4≦2.63.

[0024] In this embodiment, the radius of curvature of the object side surface of the second lens L2 is defined as R3, and the radius of curvature of the image side surface of the second lens L2 is defined as R4, and the conditional expression 1.00≦(R3+R4) / (R3-R4)≦1.80 is satisfied, thereby defining the shape of the second lens L2 and reducing the degree of deflection of light passing through the lens within the range defined by the conditional expression, thereby effectively correcting aberrations. Preferably, the conditional expression 1.02≦(R3+R4) / (R3-R4)≦1.40 is satisfied.

[0025] In this embodiment, the radius of curvature of the object side surface of the fourth lens L4 is defined as R7, the radius of curvature of the image side surface of the fourth lens L4 is defined as R8, and the shape of the fourth lens L4 is defined by satisfying the conditional formula -8.00≦R7 / R8≦-4.00, which contributes to correcting the astigmatism and distortion of the imaging optical lens 10 within the range defined by the conditional formula, and the distortion aberration |Distortion|≦2.5%, reducing the possibility of vignetting. Preferably, -5.71≦R7 / R8≦-3.99 is satisfied.

[0026] In this embodiment, the focal length of the second lens L2 is defined as f2, and the conditional expression -4.50≦f2 / f≦-1.40 is satisfied, thereby defining the ratio between the focal length of the second lens L2 and the focal length f of the imaging optical lens 10, and effectively balancing the spherical aberration and the amount of field curvature of the system within the range of the conditional expression. Preferably, the conditional expression satisfies -2.45≦f2 / f≦-1.48.

[0027] In this embodiment, the total optical length of the imaging optical lens 10 is defined as TTL, the on-axis thickness of the fifth lens L5 is defined as d9, and the conditional expression 6.00≦TTL / d9≦20.00 is satisfied, thereby defining the ratio between the optical length of the imaging optical lens 10 and the on-axis thickness of the fifth lens L5, and contributing to the system appropriately allocating the thickness of each lens and further appropriately allocating the refractive power. Preferably, the conditional expression 10.61≦TTL / d9≦11.83 is satisfied.

[0028] In this embodiment, the first lens L1 has a positive refractive power, the object side surface of the first lens L1 is a paraxial convex surface, and the image side surface of the first lens L1 is a paraxial concave surface. In other optional embodiments, the object side surface and the image side surface of the first lens L1 may be arranged in other concave-convex distribution situations, and the first lens L1 may have a negative refractive power.

[0029] In this embodiment, the radius of curvature of the object side surface of first lens L1 is defined as R1, and the radius of curvature of the image side surface of first lens L1 is defined as R2. By satisfying the conditional expression -2.42≦(R1+R2) / (R1-R2)≦-1.97, the shape of first lens L1 is defined, and within the range defined by the conditional expression, the degree of deflection of light passing through the lens can be reduced, making it possible to effectively correct aberrations.

[0030] In this embodiment, the axial thickness of the first lens is defined as d1, and the conditional expression 0.06≦d1 / TTL≦0.11 is satisfied, thereby specifying the ratio between the optical length of the imaging optical lens 10 and the axial thickness of the first lens L1, which contributes to the system appropriately allocating the thickness of each lens and further appropriately allocating the refractive power.

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

[0032] In this embodiment, the axial thickness of the second lens L2 is defined as d3, and the conditional expression 0.03≦d3 / TTL≦0.06 is satisfied, thereby specifying the ratio between the optical length of the imaging optical lens 10 and the axial thickness of the second lens L2, which contributes to the system appropriately allocating the thickness of each lens and further appropriately allocating the refractive power.

[0033] In this embodiment, the third lens L3 has a negative refractive power, and the object side surface of the third lens L3 is a paraxial convex surface, and the image side surface of the third lens L3 is a paraxial concave surface. In other optional embodiments, the object side surface and the image side surface of the third lens L3 may be arranged in other concave-convex distribution conditions, and the third lens L3 may have a positive refractive power.

[0034] In this embodiment, the focal length of the third lens L3 is defined as f3, and the conditional expression −109.81≦f3 / f≦77.62 is satisfied, thereby specifying the ratio between the focal length of the third lens L3 and the focal length f of the imaging optical lens 10, and it is possible to effectively balance the spherical aberration and the amount of field curvature of the system within the range of the conditional expression.

[0035] In this embodiment, the radius of curvature of the object side surface of the third lens L3 is defined as R5, and the radius of curvature of the image side surface of the third lens L3 is defined as R6. By satisfying the conditional expression -29.33≦(R5+R6) / (R5-R6)≦25.94, the shape of the third lens L3 is defined, and within the range defined by the conditional expression, the degree of deflection of light passing through the lens can be reduced, making it possible to effectively correct aberrations.

[0036] In this embodiment, the axial thickness of the third lens L3 is defined as d5, and the conditional expression 0.10≦d5 / TTL≦0.13 is satisfied, thereby specifying the ratio between the optical length of the imaging optical lens 10 and the axial thickness of the third lens L3, which contributes to the system appropriately allocating the thickness of each lens and further appropriately allocating the refractive power.

[0037] In this embodiment, the fourth lens L4 has a positive refractive power, the object side surface of the fourth lens L4 is a paraxial convex surface, and the image side surface of the fourth lens L4 is a paraxial convex surface. In other optional embodiments, the object side surface and the image side surface of the fourth lens L4 may be arranged in other concave-convex distribution conditions, and the fourth lens L4 may have a negative refractive power.

[0038] In this embodiment, the focal length of the fourth lens L4 is defined as f4, and the conditional expression 0.52≦f4 / f≦0.63 is satisfied, thereby specifying the ratio between the focal length of the fourth lens L4 and the focal length f of the imaging optical lens 10, and it is possible to effectively balance the spherical aberration and the amount of field curvature of the system within the range of the conditional expression.

[0039] In this embodiment, the radius of curvature of the object side of the fourth lens L4 is defined as R7, and the radius of curvature of the image side surface of the fourth lens L4 is defined as R8. Furthermore, by satisfying the conditional expression 0.60≦(R7+R8) / (R7−R8)≦0.71, the shape of the fourth lens L4 is specified, and within the range of the conditional expression, it is possible to reduce the degree of deflection of light passing through the lens, and aberrations can be effectively corrected.

[0040] In this embodiment, the axial thickness of the fourth lens L4 is defined as d7, and the conditional expression 0.15≦d7 / TTL≦0.21 is satisfied, thereby specifying the ratio between the optical length of the imaging optical lens 10 and the axial thickness of the fourth lens L4, which contributes to the system appropriately allocating the thickness of each lens and further appropriately allocating the refractive power.

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

[0042] In this embodiment, the focal length of the fifth lens L5 is defined as f5, and the conditional expression -0.66≦f5 / f≦-0.55 is satisfied, thereby specifying the ratio between the focal length of the fifth lens L5 and the focal length f of the imaging optical lens 10, and it is possible to effectively balance the spherical aberration and the amount of field curvature of the system within the range of the conditional expression.

[0043] In this embodiment, the radius of curvature of the object side surface of the fifth lens L5 is defined as R9, and the radius of curvature of the image side surface of the fifth lens L5 is defined as R10. By satisfying the conditional expression 1.56≦(R9+R10) / (R9-R10)≦1.79, the shape of the fifth lens L5 is defined, and within the range defined by the conditional expression, the degree of deflection of light passing through the lens can be reduced, making it possible to effectively correct aberrations.

[0044] In this embodiment, the angle of view of the imaging optical lens 10 is defined as FOV, and if the condition FOV≧75.00° is satisfied, the wider angle of view brings about a better user experience.

[0045] In this embodiment, the aperture value of the imaging optical lens 10 is defined as FNO, and if the conditional expression FNO≦2.27 is satisfied, a large aperture is realized and good imaging performance is achieved for the imaging optical lens 10. Preferably, FNO≦2.20 is satisfied.

[0046] In this embodiment, the radius of the object side surface of the first lens L1 is defined as SD, and SD≦0.85 mm, which is favorable for realizing a small header and can achieve the effect of ultra-thinning.

[0047] In this embodiment, the composite focal length of the first lens L1 and the second lens L2 is defined as f12, and satisfies the conditional formula 2.37≦f12 / f≦3.31. Within the range of the conditional formula, it is possible to eliminate aberration and distortion of the imaging optical lens 10, suppress the back focus of the imaging optical lens 10, and maintain the compactness of the imaging lens system.

[0048] When the above relationship is satisfied, the imaging optical lens 10 has good optical performance and at the same time meets the design requirements for a wide angle and an extremely thin shape, and is particularly applicable to imaging lens units of mobile phones and web imaging lenses that are configured with imaging elements such as high-pixel CCDs and CMOSs.

[0049] The imaging optical lens 10 according to the present invention will be described below using examples. The symbols used in each example are as follows. The units for the focal length, axial distance, radius of curvature, axial thickness, inflection point position, and stationary point position are mm.

[0050] TTL is the optical length (the axial distance from the object side surface of the first lens L1 to the image plane Si) and is measured in mm.

[0051] The aperture value FNO refers to the ratio of the effective focal length of the imaging optical lens 10 to the entrance pupil diameter.

[0052] In addition, at least one of the object side and image side of each lens may be provided with an inflection point and / or a stationary point to meet high quality imaging demands.

[0053] Tables 1 and 2 show the design data of the imaging optical lens 10 shown in FIG.

[0054] [Table 1]

[0055] The meaning of each symbol in the above table is as follows: S1: Aperture R: Radius of curvature at the center of the optical surface R1: Radius of curvature of the object side surface of the first lens L1 R2: Radius of curvature of the image side surface of the first lens L1 R3: Radius of curvature of the object side surface of the second lens L2 R4: Radius of curvature of the image side of the second lens L2 R5: Radius of curvature of the object side surface of the third lens L3 R6: Radius of curvature of the image side of the third lens L3 R7: Radius of curvature of the object side of the fourth lens L4 R8: Radius of curvature of the image side of the fourth lens L4 R9: Radius of curvature of the object side of the fifth lens L5 R10: Radius of curvature of the image side of the fifth lens L5 R11: Radius of curvature of the object side of the optical filter GF R12: Radius of curvature of the image side of the optical filter GF d: Axial thickness of lens, axial distance between lenses d0: The axial distance from the aperture S1 to the object side of the first lens L1 d1: Axial thickness of the first lens L1 d2: The axial distance from the image side surface of the first lens L1 to the object side surface of the second lens L2 d3: Axial thickness of the second lens L2 d4: The axial distance from the image side surface of the second lens L2 to the object side surface of the third lens L3 d5: Axial thickness of the third lens L3 d6: The axial distance from the image side surface of the third lens L3 to the object side surface of the fourth lens L4 d7: Axial thickness of the fourth lens L4 d8: The axial distance from the image side surface of the fourth lens L4 to the object side surface of the fifth lens L5 d9: Axial thickness of the fifth lens L5 d10: the axial distance from the image side surface of the fifth lens L5 to the object side surface of the optical filter GF d11: On-axis thickness of optical filter GF d12: The axial distance from the image side of the optical filter GF to the image plane Si nd: Refractive index of d line nd1: refractive index of the first lens L1 at the d line nd2: refractive index of the d line of the second lens L2 nd3: refractive index of the d line of the third lens L3 nd4: Refractive index of the d line of the fourth lens L4 nd5: refractive index of the d line of the fifth lens L5 ndg: Refractive index of the d line of the optical filter GF vd: Abbe number v1: Abbe number of the first lens L1 v2: Abbe number of the second lens L2 v3: Abbe number of the third lens L3 v4: Abbe number of the fourth lens L4 v5: Abbe number of the fifth lens L5 vg: Abbe number of the optical filter GF.

[0056] Table 2 shows the aspheric data of each lens in the imaging optical lens 10 of the first embodiment according to the present invention.

[0057] [Table 2]

[0058] Here, k is the conic coefficient, and A4, A6, A8, A10, A12, A14, A16, A18, and A20 are aspheric coefficients.

[0059] y=(x 2 / R) / [1+{1―(k+1)(x 2 R 2 )} 1 / 2 ]+A4x 4 +A6x 6 +A8x 8 +A10x 10 +A12x 12 +A14x 14 +A16x 16 +A18x 18 +A20x 20 (19) Here, x is the perpendicular distance between a point on the aspheric curve and the optical axis, and y is the aspheric depth (the perpendicular distance between a point on the aspheric surface that is a distance x away from the optical axis and a tangent plane that is tangent to the vertex of the aspheric surface on the optical axis).

[0060] For convenience, the aspheric surface of each lens surface is expressed by the above formula (19). However, the present invention is not particularly limited to the aspheric polynomial of this formula (19).

[0061] Tables 3 and 4 show the design data of the inflection points and stationary points of each lens in the imaging optical lens 10 according to this embodiment. Here, P1R1 and P1R2 respectively represent the object side surface and the image side surface of the first lens L1, P2R1 and P2R2 respectively represent the object side surface and the image side surface of the second lens L2, P3R1 and P3R2 respectively represent the object side surface and the image side surface of the third lens L3, P4R1 and P4R2 respectively represent the object side surface and the image side surface of the fourth lens L4, and P5R1 and P5R2 respectively represent the object side surface and the image side surface of the fifth lens L5. The corresponding data in the "inflection point position" column is the vertical distance from the inflection point set on the surface of each lens to the optical axis of the imaging optical lens 10. The corresponding data in the "stationary point position" column is the vertical distance from the stationary point set on the surface of each lens to the optical axis of the imaging optical lens 10.

[0062] [Table 3]

[0063] [Table 4]

[0064] Fig. 2 is a schematic diagram showing the field curvature and distortion aberration after light with a wavelength of 546 nm passes through the imaging optical lens 10. The field curvature S in Fig. 2 is the field curvature in the sagittal direction, and T is the field curvature in the tangential direction. Figs. 3 and 4 are schematic diagrams showing the magnification chromatic aberration and axial chromatic aberration after light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm, and 435 nm, respectively, passes through the imaging optical lens 10.

[0065] As shown in Table 21, the first embodiment satisfies each of the conditional expressions.

[0066] In this embodiment, the entrance pupil diameter ENPD of the imaging optical lens 10 is 1.263 mm, the full field of view image height IH is 2.626 mm, and the diagonal angle of view FOV is 85.00°. The imaging optical lens 10 satisfies the design requirements for a large aperture, wide angle, and extreme thinness, and its on-axis and off-axis chromatic aberrations are sufficiently corrected, resulting in excellent optical characteristics.

[0067] Second embodiment FIG. 5 is a schematic diagram showing the configuration of the imaging optical lens 20 in the second embodiment. The second embodiment is basically the same as the first embodiment, and the meanings of the symbols are also the same as in the first embodiment, so the same parts will not be described repeatedly here.

[0068] In the second embodiment, the third lens L3 has a positive refractive power.

[0069] Tables 5 and 6 show the design data of the imaging optical lens 20 shown in FIG.

[0070] [Table 5]

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

[0072] [Table 6]

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

[0074] [Table 7]

[0075] [Table 8]

[0076] Fig. 6 is a schematic diagram showing the field curvature and distortion aberration after light with a wavelength of 546 nm passes through the imaging optical lens 20. The field curvature S in Fig. 6 is the field curvature in the sagittal direction, and T is the field curvature in the tangential direction. Figs. 7 and 8 are schematic diagrams showing the magnification chromatic aberration and axial chromatic aberration after light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm, and 435 nm, respectively, pass through the imaging optical lens 20.

[0077] As shown in Table 21, the second embodiment satisfies each of the conditional expressions.

[0078] In this embodiment, the entrance pupil diameter ENPD of the imaging optical lens 20 is 1.490 mm, the full field of view image height IH is 2.626 mm, and the diagonal angle of view FOV is 75.66°. The imaging optical lens 20 satisfies the design requirements of a large aperture, a wide angle, and an extremely thin shape, and its on-axis and off-axis chromatic aberrations are sufficiently corrected, resulting in excellent optical characteristics.

[0079] Third embodiment FIG. 9 is a schematic diagram showing the configuration of the imaging optical lens 30 in the third embodiment. The third embodiment is basically the same as the first embodiment, and the meanings of the symbols are also the same as in the first embodiment, so the same parts will not be described repeatedly here.

[0080] In the third embodiment, the third lens L3 has a positive refractive power.

[0081] Tables 9 and 10 show the design data of the imaging optical lens 30 shown in FIG.

[0082] [Table 9]

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

[0084] [Table 10]

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

[0086] [Table 11]

[0087] [Table 12]

[0088] Fig. 10 is a schematic diagram showing the field curvature and distortion aberration after light with a wavelength of 546 nm passes through the imaging optical lens 30. The field curvature S in Fig. 10 is the field curvature in the sagittal direction, and T is the field curvature in the tangential direction. Figs. 11 and 12 are schematic diagrams showing the lateral chromatic aberration and axial chromatic aberration after light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm, and 435 nm, respectively, passes through the imaging optical lens 30.

[0089] As shown in Table 21, the third embodiment satisfies each of the conditional expressions.

[0090] In this embodiment, the entrance pupil diameter ENPD of the imaging optical lens 30 is 1.208 mm, the full field of view image height IH is 2.626 mm, and the diagonal angle of view FOV is 87.63°. The imaging optical lens 30 satisfies the design requirements for a large aperture, wide angle, and extreme thinness, and its on-axis and off-axis chromatic aberrations are sufficiently corrected, resulting in excellent optical characteristics.

[0091] (Fourth embodiment) FIG. 13 is a schematic diagram showing the configuration of the imaging optical lens 40 in the fourth embodiment. The fourth embodiment is basically the same as the first embodiment, and the meanings of the symbols are also the same as in the first embodiment, so the same parts will not be described repeatedly here.

[0092] In the fourth embodiment, the third lens L3 has a positive refractive power.

[0093] Tables 13 and 14 show the design data of the imaging optical lens 40 shown in FIG.

[0094] [Table 13]

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

[0096] [Table 14]

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

[0098] [Table 15]

[0099] [Table 16]

[0100] Fig. 14 is a schematic diagram showing the field curvature and distortion aberration after light with a wavelength of 546 nm passes through the imaging optical lens 40. The field curvature S in Fig. 14 is the field curvature in the sagittal direction, and T is the field curvature in the tangential direction. Figs. 15 and 16 are schematic diagrams showing the lateral chromatic aberration and axial chromatic aberration after light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm, and 435 nm, respectively, passes through the imaging optical lens 40.

[0101] As shown in Table 21, the fourth embodiment satisfies each of the conditional expressions.

[0102] In this embodiment, the entrance pupil diameter ENPD of the imaging optical lens 40 is 1.170 mm, the full field of view image height IH is 2.626 mm, and the diagonal angle of view FOV is 89.49°. The imaging optical lens 40 satisfies the design requirements of a large aperture, a wide angle, and an extremely thin shape, and its on-axis and off-axis chromatic aberrations are sufficiently corrected, resulting in excellent optical characteristics.

[0103] (Comparative Example) FIG. 17 is a schematic diagram showing the structure of an imaging optical lens 50 in a comparative example, and since the meanings of the symbols are the same as those in the first embodiment, the same parts will not be described repeatedly here.

[0104] In the comparative example, the third lens L3 has a positive refractive power.

[0105] Tables 17 and 18 show the design data of the imaging optical lens 50 shown in FIG.

[0106] [Table 17]

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

[0108] [Table 18]

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

[0110] [Table 19]

[0111] [Table 20]

[0112] Fig. 18 is a schematic diagram showing the field curvature and distortion aberration after light with a wavelength of 546 nm passes through the imaging optical lens 50. The field curvature S in Fig. 18 is the field curvature in the sagittal direction, and T is the field curvature in the tangential direction. Figs. 19 and 20 are schematic diagrams showing the lateral chromatic aberration and axial chromatic aberration after light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm, and 435 nm, respectively, passes through the imaging optical lens 50.

[0113] In this comparative example, the entrance pupil diameter ENPD of the imaging optical lens 50 is 1.592 mm, the image height IH in the full field of view is 2.626 mm, and the angle of view FOV in the diagonal direction is 67.86°.

[0114] Table 21 shows various numerical values ​​and values ​​corresponding to parameters defined by conditional expressions in the first to fourth embodiments and the comparative example. Clearly, the imaging optical lens 50 of the comparative example does not satisfy the above conditional expression 1.10≦f1 / f≦1.60. The imaging optical lens 50 cannot effectively combine a large aperture, an extremely thin design, and a wide angle, and does not have sufficiently excellent optical performance.

[0115] [Table 21]

[0116] As will be understood by those skilled in the art, the above-described embodiments are specific embodiments for realizing the present invention, and in actual application, various changes in form and details are possible without departing from the spirit and scope of the present invention.

Claims

1. 1. An imaging optical lens, comprising: The optical system is configured with, 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 refractive power, a fourth lens having positive refractive power, and a fifth lens having negative refractive power, an imaging optical lens satisfying the following conditional expressions (1) to (4): f is a focal length of the imaging optical lens, f1 is a focal length of the first lens, d3 is an axial thickness of the second lens, d4 is an axial distance from the image side surface of the second lens to the object side surface of the third lens, R3 is a radius of curvature of the object side surface of the second lens, R4 is a radius of curvature of the image side surface of the second lens, R7 is a radius of curvature of the object side surface of the fourth lens, and R8 is a radius of curvature of the image side surface of the fourth lens. 1.10≦f1 / f≦1.60 (1) 1.50≦d3 / d4≦3.50 (2) -8.00≦R7 / R8≦-4.00 (3) 1.00≦(R3+R4) / (R3-R4)≦1.80 (4)

2. 2. The imaging optical lens according to claim 1, wherein the following conditional expression (5) is satisfied when the focal length of the second lens is f2: -4.50≦f2 / f≦-1.50 (5)

3. 2. The imaging optical lens according to claim 1, wherein the following conditional expression (6) is satisfied, where TTL is an optical length of the imaging optical lens and d9 is an axial thickness of the fifth lens: 6.00≦TTL / d9≦20.00 (6)

4. an object side surface of the first lens is a paraxially convex surface, and an image side surface of the first lens is a paraxially concave surface, 2. The imaging optical lens according to claim 1, wherein the following conditional expressions (7) and (8) are satisfied when a radius of curvature of an object-side surface of the first lens is R1, a radius of curvature of an image-side surface of the first lens is R2, an optical length of the imaging optical lens is TTL, and an axial thickness of the first lens is d1. -2.42≦(R1+R2) / (R1-R2)≦-1.97 (7) 0.06≦d1 / TTL≦0.11 (8)

5. an object side surface of the second lens is a paraxially convex surface, and an image side surface of the second lens is a paraxially concave surface, 2. The imaging optical lens according to claim 1, wherein the following conditional expression (9) is satisfied, where TTL is an optical length of the imaging optical lens and d3 is an axial thickness of the second lens: 0.03≦d3 / TTL≦0.06 (9)

6. an object side surface of the third lens is a paraxially convex surface, and an image side surface of the third lens is a paraxially concave surface, 2. The imaging optical lens according to claim 1, wherein the imaging optical lens satisfies the following conditional expressions (10) to (12): −109.81≦f3 / f≦77.62 (10) -29.33≦(R5+R6) / (R5-R6)≦25.94 (11) 0.10≦d5 / TTL≦0.13 (12)

7. an object side surface of the fourth lens is a paraxially convex surface, and an image side surface of the fourth lens is a paraxially convex surface, 2. The imaging optical lens according to claim 1, wherein the imaging optical lens satisfies the following conditional expressions (13) to (15): 0.52≦f4 / f≦0.63 (13) 0.60≦(R7+R8) / (R7-R8)≦0.71 (14) 0.15≦d7 / TTL≦0.21 (15)

8. an object side surface of the fifth lens is a paraxially convex surface, and an image side surface of the fifth lens is a paraxially concave surface, 2. The imaging optical lens according to claim 1, wherein the following conditional expressions (16) and (17) are satisfied when a focal length of the fifth lens is f5, a radius of curvature of a surface of the fifth lens facing an object side is R9, and a radius of curvature of a surface of the fifth lens facing an image side is R10. −0.66≦f5 / f≦−0.55 (16) 1.56≦(R9+R10) / (R9-R10)≦1.79 (17)

9. 2. The imaging optical lens according to claim 1, wherein the imaging optical lens satisfies the following conditional expression (18), where FOV is an angle of view of the imaging optical lens: FOV≧75.00° (18)

10. 2. The imaging optical lens according to claim 1, wherein the radius of the object side surface of the first lens is 0.85 mm or less.

Images