CN111077646B

CN111077646B - Image pickup optical lens

Info

Publication number: CN111077646B
Application number: CN201911336287.4A
Authority: CN
Inventors: 杨永强
Original assignee: Chengrui Optics Changzhou Co Ltd
Current assignee: Chengrui Optics Changzhou Co Ltd
Priority date: 2019-12-23
Filing date: 2019-12-23
Publication date: 2021-07-30
Anticipated expiration: 2039-12-23
Also published as: CN111077646A

Abstract

The invention provides a photographic optical lens, which sequentially comprises a first lens with positive refractive power, a second lens with negative refractive power, a third lens with negative refractive power, a fourth lens with positive refractive power and a fifth lens with negative refractive power from an object side to an image side, and the following relational expressions are satisfied: f1/f is more than or equal to 0.35 and less than or equal to 0.60; 3.50-15.00 (R7+ R8)/(R7-R8); r3/d3 is more than or equal to 15.00; d4/d5 is more than or equal to 3.00 and less than or equal to 10.00; 1.85-5.00 of (R5+ R6)/(R5-R6). The shooting optical lens has good optical performance and also meets the design requirements of large aperture, long focal length and ultra-thin thickness.

Description

Image pickup optical lens

[ technical field ] A method for producing a semiconductor device

The present invention relates to the field of optical lenses, and more particularly, to an imaging optical lens suitable for portable terminal devices such as smart phones and digital cameras, and imaging apparatuses such as monitors and PC lenses.

[ background of the invention ]

In recent years, with the rise of smart phones, the demand of miniaturized camera lenses is increasing, and the photosensitive devices of general camera lenses are not limited to two types, namely, a Charge Coupled Device (CCD) or a Complementary Metal-Oxide Semiconductor (CMOS) Device, and due to the refinement of Semiconductor manufacturing technology, the pixel size of the photosensitive devices is reduced, and in addition, the current electronic products are developed in a form of being excellent in function, light, thin, short and small, so that the miniaturized camera lenses with good imaging quality are the mainstream in the current market.

In order to obtain better imaging quality, the lens mounted on the mobile phone camera conventionally adopts a three-piece or four-piece lens structure. Moreover, with the development of technology and the increase of diversified demands of users, under the condition that the pixel area of the photosensitive device is continuously reduced and the requirement of the system on the imaging quality is continuously improved, five-piece, six-piece and seven-piece lens structures gradually appear in the design of the lens. An ultra-thin long-focus imaging optical lens having excellent optical characteristics is urgently required.

[ summary of the invention ]

The invention aims to provide an imaging optical lens which can meet the requirements of ultra-thinning and long focal length while obtaining high imaging performance.

The technical scheme of the invention is as follows: an imaging optical lens includes, in order from an object side to an image side: a first lens element with positive refractive power, a second lens element with negative refractive power, a third lens element with negative refractive power, a fourth lens element with positive refractive power, and a fifth lens element with negative refractive power;

wherein a focal length of the entire imaging optical lens is f, a focal length of the first lens is f1, a radius of curvature of an object-side surface of the second lens is R3, a radius of curvature of an object-side surface of the third lens is R5, a radius of curvature of an image-side surface of the third lens is R6, a radius of curvature of an object-side surface of the fourth lens is R7, a radius of curvature of an image-side surface of the fourth lens is R8, an on-axis thickness of the second lens is d3, an on-axis distance from the image-side surface of the second lens to the object-side surface of the third lens is d4, an on-axis thickness of the third lens is d5, and the following relations are satisfied: f1/f is more than or equal to 0.35 and less than or equal to 0.60; 3.50-15.00 (R7+ R8)/(R7-R8); r3/d3 is more than or equal to 15.00; d4/d5 is more than or equal to 3.00 and less than or equal to 10.00; 1.85-5.00 of (R5+ R6)/(R5-R6).

Preferably, the focal length of the second lens is f2, and the following relation is satisfied: f2/f is more than or equal to-0.90 and less than or equal to-0.60.

Preferably, a curvature radius of an object-side surface of the first lens is R1, a curvature radius of an image-side surface of the first lens is R2, an on-axis thickness of the first lens is d1, an optical total length of the imaging optical lens is TTL, and the following relational expression is satisfied: -4.16 ≤ (R1+ R2)/(R1-R2) ≤ 0.45; d1/TTL is more than or equal to 0.08 and less than or equal to 0.32.

Preferably, the curvature radius of the image-side surface of the second lens element is R4, the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied: not less than 1.00 (R3+ R4)/(R3-R4) not more than 4.81; d3/TTL is more than or equal to 0.02 and less than or equal to 0.09.

Preferably, the focal length of the third lens element is f3, the total optical length of the image pickup optical lens is TTL, and the following relationship is satisfied: f3/f is not less than 5.07 and not more than-0.40; d5/TTL is more than or equal to 0.02 and less than or equal to 0.06.

Preferably, the focal length of the fourth lens is f4, the on-axis thickness of the fourth lens is d7, the total optical length of the image pickup optical lens is TTL, and the following relation is satisfied: f4/f is more than or equal to 0.66 and less than or equal to 33.03; d7/TTL is more than or equal to 0.05 and less than or equal to 0.17.

Preferably, the focal length of the fifth lens element is f5, the curvature radius of the object-side surface of the fifth lens element is R9, the curvature radius of the image-side surface of the fifth lens element is R10, the on-axis thickness of the fifth lens element is d9, the total optical length of the imaging optical lens system is TTL, and the following relationships are satisfied: f5/f is not less than 7.89 and not more than-0.82; 11.24-1.11 of (R9+ R10)/(R9-R10); d9/TTL is more than or equal to 0.02 and less than or equal to 0.11.

Preferably, the total optical length of the image pickup optical lens is TTL, and satisfies the following relation: f/TTL is more than or equal to 1.16.

Preferably, the F-number of the imaging optical lens is Fno, and the following relationship is satisfied: fno is less than or equal to 2.52.

Preferably, the combined focal length of the first lens and the second lens is f12, and the following relation is satisfied: f12/f is more than or equal to 0.29 and less than or equal to 1.28.

The invention has the beneficial effects that:

the shooting optical lens provided by the invention has good optical performance and meets the design requirements of large aperture, long focal length and ultra-thinning.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:

fig. 1 is a schematic configuration diagram of an imaging optical lens of a first embodiment;

fig. 2 is a schematic view of axial aberrations of the image-taking optical lens shown in fig. 1;

fig. 3 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in fig. 1;

FIG. 4 is a schematic view of curvature of field and distortion of the imaging optical lens shown in FIG. 1;

fig. 5 is a schematic configuration diagram of an imaging optical lens of the second embodiment;

fig. 6 is a schematic view of axial aberrations of the image pickup optical lens shown in fig. 5;

fig. 7 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in fig. 5;

FIG. 8 is a schematic view of curvature of field and distortion of the imaging optical lens shown in FIG. 5;

fig. 9 is a schematic configuration diagram of an imaging optical lens of the third embodiment;

fig. 10 is a schematic view of axial aberrations of the image pickup optical lens shown in fig. 9;

fig. 11 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in fig. 9;

fig. 12 is a schematic view of curvature of field and distortion of the imaging optical lens shown in fig. 9;

fig. 13 is a schematic configuration diagram of an imaging optical lens of the fourth embodiment;

fig. 14 is a schematic view of axial aberrations of the image pickup optical lens shown in fig. 13;

fig. 15 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in fig. 13;

fig. 16 is a schematic view of curvature of field and distortion of the imaging optical lens shown in fig. 13.

[ detailed description ] embodiments

The invention is further described with reference to the following figures and embodiments.

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present invention in its various embodiments. However, the technical solution claimed in the present invention can be implemented without these technical details and various changes and modifications based on the following embodiments.

(first embodiment)

Referring to fig. 1 to 4, the present invention provides an image pickup optical lens 10 according to a first embodiment. In fig. 1, the left side is an object side, the right side is an image side, and the imaging optical lens assembly 10 mainly includes five lenses, namely, an aperture stop S1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5 in order from the object side to the image side. A glass flat GF is disposed between the fifth lens L5 and the image plane Si, and the glass flat GF may be a glass cover plate or an optical filter.

In this embodiment, the first lens element L1 has positive refractive power; the second lens element L2 has negative refractive power; the third lens element L3 has negative refractive power; the fourth lens element L4 has positive refractive power; the fifth lens element L5 has negative refractive power.

Here, the focal length of the entire imaging optical lens is f, the focal length of the first lens is f1, the radius of curvature of the object-side surface of the second lens is R3, 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 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 on-axis thickness of the second lens is d3, the on-axis distance from the image-side surface of the second lens to the object-side surface of the third lens is d4, and the on-axis thickness of the third lens is d5, and the following relational expressions are satisfied:

0.35≤f1/f≤0.60 (1)

3.50≤(R7+R8)/(R7-R8)≤15.00 (2)

15.00≤R3/d3 (3)

3.00≤d4/d5≤10.00 (4)

1.85≤(R5+R6)/(R5-R6)≤5.00 (5)

the conditional expression (1) specifies the ratio of the focal length of the first lens to the total focal length of the system, which can effectively balance the spherical aberration and the field curvature of the system. Preferably, 0.36. ltoreq. f 1/f. ltoreq.0.60 is satisfied.

The conditional expression (2) specifies the shape of the fourth lens, and in this range, it is advantageous to correct the aberration of the off-axis view angle as the ultra-thin and wide-angle lens progresses. Preferably, 3.55 ≦ (R7+ R8)/(R7-R8) ≦ 14.96 is satisfied.

Conditional expression (3) specifies the ratio of the radius of curvature of the object-side surface of the second lens to the thickness of the second lens, and contributes to the improvement of the optical system performance within the range of the conditional expression. Preferably, 15.05. ltoreq.R 3/d3 is satisfied.

The conditional expression (4) specifies the ratio of the air space of the second third lens to the thickness of the third lens, and contributes to the reduction of the total length of the optical system within the range of the conditional expression, thereby achieving the effect of making the optical system ultra thin. Preferably, 3.11. ltoreq. d4/d 5. ltoreq.9.7 is satisfied.

The conditional expression (5) specifies the shape of the third lens, and within the range specified by the conditional expression, the deflection degree of the light passing through the lens can be alleviated, and the aberration can be effectively reduced. Preferably, 1.86 ≦ (R5+ R6)/(R5-R6) ≦ 4.95 is satisfied.

Defining the focal length of the second lens L2 as f2 and the focal length of the entire imaging optical lens as f, the following relations are satisfied: f2/f is less than or equal to-0.60, and the ratio of the focal length of the second lens to the total focal length of the system is defined, and the system has better imaging quality and lower sensitivity through reasonable distribution of the focal lengths. Preferably, it satisfies-0.90. ltoreq. f 2/f. ltoreq-0.62.

The curvature radius of the object side surface of the first lens L1 is defined as R1, the curvature radius of the image side surface of the first lens L1 is defined as R2, and the following relational expressions are satisfied: -4.16 ≦ (R1+ R2)/(R1-R2) ≦ -0.45, and the shape of the first lens is appropriately controlled so that the first lens can effectively correct the system spherical aberration, preferably, satisfying-2.60 ≦ (R1+ R2)/(R1-R2) ≦ -0.56.

The on-axis thickness of the first lens L1 is d1, the total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: d1/TTL is more than or equal to 0.08 and less than or equal to 0.32, and ultra-thinning is facilitated in the conditional expression range. Preferably, 0.13. ltoreq. d 1/TTL. ltoreq.0.26 is satisfied.

The curvature radius of the object side surface of the second lens L2 is defined as R3, the curvature radius of the image side surface of the second lens L2 is defined as R4, and the following relations are satisfied: the shape of the second lens L2 is defined to be not less than 1.00 (R3+ R4)/(R3-R4) and not more than 4.81, and the problem of chromatic aberration on the axis can be corrected favorably as the lens is made to be in an ultra-thin wide angle range within the range. Preferably, 1.60 ≦ (R3+ R4)/(R3-R4) ≦ 3.85.

The on-axis thickness of the second lens L2 is d3, the total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: d3/TTL is more than or equal to 0.02 and less than or equal to 0.09, and ultra-thinning is favorably realized within the range of conditional expressions. Preferably, 0.03. ltoreq. d 3/TTL. ltoreq.0.08 is satisfied.

Defining the focal length of the third lens L3 as f3 and the focal length of the entire imaging optical lens 10 as f, the following relational expression is satisfied: -5.07 ≦ f3/f ≦ -0.40, allowing better imaging quality and lower sensitivity of the system through reasonable distribution of optical power. Preferably, it satisfies-3.17. ltoreq. f 3/f. ltoreq-0.50.

The on-axis thickness of the third lens L3 is d5, the total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: d5/TTL is more than or equal to 0.02 and less than or equal to 0.06, and ultra-thinning is facilitated in the conditional expression range. Preferably, 0.03. ltoreq. d 5/TTL. ltoreq.0.05 is satisfied.

Defining the focal length of the fourth lens L4 as f4 and the focal length of the entire imaging optical lens 10 as f, the following relational expression is satisfied: 0.66 ≦ f4/f ≦ 33.03, and the system has better imaging quality and lower sensitivity through reasonable distribution of the focal power. Preferably, 1.06. ltoreq. f 4/f. ltoreq.26.42 is satisfied.

The on-axis thickness of the fourth lens L4 is d7, the total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: d7/TTL is more than or equal to 0.05 and less than or equal to 0.17, and ultra-thinning is facilitated in the condition formula range. Preferably, 0.07. ltoreq. d 7/TTL. ltoreq.0.13 is satisfied.

Defining the focal length of the fifth lens element as f5 and the focal length of the entire imaging optical lens system 10 as f, the following relationships are satisfied: 7.89 is less than or equal to f5/f is less than or equal to-0.82, and the definition of the fifth lens L5 can effectively make the light angle of the camera lens smooth and reduce the tolerance sensitivity. Preferably, it satisfies-4.93. ltoreq. f 5/f. ltoreq-1.03.

The curvature radius of the object-side surface of the fifth lens L5 is R9, and the curvature radius of the image-side surface of the fifth lens L5 is R10, and the following relationships are satisfied: 11.24 ≦ (R9+ R10)/(R9-R10) ≦ -1.11, specifying the shape of the fifth lens L5, facilitating lens processing within the condition range. Preferably, it satisfies-7.02 ≦ (R9+ R10)/(R9-R10). ltoreq.1.38.

The on-axis thickness of the fifth lens L5 is d9, the total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: d9/TTL is more than or equal to 0.02 and less than or equal to 0.11, and ultra-thinning is favorably realized within the range of conditional expressions. Preferably, 0.04. ltoreq. d 9/TTL. ltoreq.0.09 is satisfied.

In the present embodiment, the focal length of the entire imaging optical lens 10 is f, the total optical length of the imaging optical lens 10 is TTL, and the following conditional expressions are satisfied: f/TTL is more than or equal to 1.16, so that ultra-thinning is realized.

In this embodiment, the total optical length TTL of the image pickup optical lens 10 is less than or equal to 7.02 mm, which is beneficial to achieving ultra-thinning. Preferably, the total optical length TTL is less than or equal to 6.71 millimeters.

In the present embodiment, the number of apertures Fno of the imaging optical lens 10 is 2.52 or less. The large aperture is large, and the imaging performance is good. Preferably, Fno is less than or equal to 2.47.

In the present embodiment, the focal length of the imaging optical lens 10 is f, and the combined focal length of the first lens L1 and the second lens L2 is f12, and the following relationship is satisfied: f12/f is not less than 0.29 and not more than 1.28, and within the range of the conditional expression, the aberration and distortion of the image pickup optical lens 10 can be eliminated, and the back focal length of the image pickup optical lens 10 can be suppressed, so as to keep the miniaturization of the image lens system. Preferably, 0.47. ltoreq. f 12/f. ltoreq.1.03 is satisfied.

In addition, in the imaging optical lens 10 provided in the present embodiment, the surface of each lens can be an aspheric surface, which is easy to be made into a shape other than a spherical surface, so as to obtain more control variables for reducing the aberration and further reducing the number of lenses used, thereby effectively reducing the total length of the imaging optical lens 10. In the present embodiment, both the object-side surface and the image-side surface of each lens are aspheric.

It is to be noted that since the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 have the structure and the parameter relationship as described above, the image-taking optical lens 10 can reasonably distribute the power, the interval, and the shape of each lens, and thus correct various kinds of aberrations.

In addition, at least one of the object-side surface and the image-side surface of each lens may further have an inflection point and/or a stagnation point, so as to meet the requirement of high-quality imaging.

The following shows design data of the image pickup optical lens 10 shown in fig. 1.

Table 1 shows the object-side and image-side radii of curvature R, the on-axis thicknesses of the respective lenses, the distance d between the adjacent lenses, the refractive index nd, and the abbe number ν d of the first lens L1 to the fifth lens L5 constituting the imaging optical lens 10 according to the first embodiment of the present invention. In the present embodiment, R and d are both expressed in units of millimeters (mm).

[ TABLE 1 ]

The meanings of the symbols in the above table are as follows.

S1: an aperture;

r: the radius of curvature of the optical surface and the radius of curvature of the lens as the center;

r1: the radius of curvature of the object-side surface of the first lens L1;

r2: the radius of curvature of the image-side surface of the first lens L1;

r3: the radius of curvature of the object-side surface of the second lens L2;

r4: the radius of curvature of the image-side surface of the second lens L2;

r5: the radius of curvature of the object-side surface of the third lens L3;

r6: the radius of curvature of the image-side surface of the third lens L3;

r7: the radius of curvature of the object-side surface of the fourth lens L4;

r8: the radius of curvature of the image-side surface of the fourth lens L4;

r9: a radius of curvature of the object side surface of the fifth lens L5;

r10: a radius of curvature of the image-side surface of the fifth lens L5;

r11: radius of curvature of the object side of the optical filter GF;

r12: the radius of curvature of the image-side surface of the optical filter GF;

d: an on-axis thickness of the lenses and an on-axis distance between the lenses;

d 0: the on-axis distance of the stop S1 to the object-side surface of the first lens L1;

d 1: the on-axis thickness of the first lens L1;

d 2: the on-axis distance from the image-side surface of the first lens L1 to the object-side surface of the second lens L2;

d 3: the on-axis thickness of the second lens L2;

d 4: the on-axis distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3;

d 5: the on-axis thickness of the third lens L3;

d 6: the on-axis distance from the image-side surface of the third lens L3 to the object-side surface of the fourth lens L4;

d 7: the on-axis thickness of the fourth lens L4;

d 8: an on-axis distance from an image-side surface of the fourth lens L4 to an object-side surface of the fifth lens L5;

d 9: the on-axis thickness of the fifth lens L5;

d 10: the on-axis distance from the image-side surface of the fifth lens L5 to the object-side surface of the optical filter GF; d 11: on-axis thickness of the optical filter GF;

d 12: the on-axis distance from the image side surface of the optical filter GF to the image surface;

nd: the refractive index of the d-line;

nd 1: the refractive index of the d-line of the first lens L1;

nd 2: the refractive index of the d-line of the second lens L2;

nd 3: the refractive index of the d-line of the third lens L3;

nd 4: the refractive index of the d-line of the fourth lens L4;

nd 5: the refractive index of the d-line of the fifth lens L5;

ndg: the refractive index of the d-line of the optical filter GF;

vd: an Abbe number;

v 1: abbe number of the first lens L1;

v 2: abbe number of the second lens L2;

v 3: abbe number of the third lens L3;

v 4: abbe number of the fourth lens L4;

v 5: abbe number of the fifth lens L5;

vg: abbe number of the optical filter GF.

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

[ TABLE 2 ]

In table 2, k is a conic coefficient, and a4, a6, A8, a10, a12, a14, a16, a18, a20 are aspherical coefficients.

IH: image height

y＝(x²/R)/[1+{1-(k+1)(x²/R²)}^1/2]+A4x⁴+A6x⁶+A8x⁸+A10x¹⁰+A12x¹²+A14x¹⁴+A16x¹⁶+A18x¹⁸+A20x²⁰ (1)

For convenience, the aspherical surface of each lens surface uses the aspherical surface shown in the above formula (1). However, the present invention is not limited to the aspherical polynomial form expressed by this formula (1).

Tables 3 and 4 show the inflection point and the stagnation point design data of each lens in the imaging optical lens 10 of the present embodiment. P1R1 and P1R2 represent the object-side surface and the image-side surface of the first lens L1, P2R1 and P2R2 represent the object-side surface and the image-side surface of the second lens L2, P3R1 and P3R2 represent the object-side surface and the image-side surface of the third lens L3, P4R1 and P4R2 represent the object-side surface and the image-side surface of the fourth lens L4, and P5R1 and P5R2 represent the object-side surface and the image-side surface of the fifth lens L5, respectively. The "inflection point position" field correspondence data is a vertical distance from an inflection point set on each lens surface to the optical axis of the image pickup optical lens 10. The "stagnation point position" field corresponding data is the vertical distance from the stagnation point set on each lens surface to the optical axis of the imaging optical lens 10.

[ TABLE 3 ]

	Number of points of inflection	Position of reverse curvature 1	Position of reverse curvature 2	Position of reverse curvature 3	Position of reverse curve 4
						P1R1	1	1.495
P1R2	1	0.825
						P2R1	1	0.305
P2R2	0
						P3R1	2	0.325	0.545
P3R2	0
						P4R1	4	0.885	1.295	1.445	1.575
P4R2	2	1.275	1.685
						P5R1	2	1.275	1.695
P5R2	4	0.525	0.925	1.455	1.725

[ TABLE 4 ]

	Number of stagnation points	Location of stagnation 1	Location of stagnation 2
				P1R1	0
P1R2	1	1.265
				P2R1	1	0.595
P2R2	0
				P3R1	0
P3R2	0
				P4R1	2	1.555	1.585
P4R2	0
				P5R1	2	1.655	1.725
P5R2	0

Table 17 below also lists values corresponding to various parameters in the first embodiment and parameters already defined in the conditional expressions.

Fig. 2 and 3 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm passing through the imaging optical lens 10, respectively. Fig. 4 is a schematic view showing curvature of field and distortion of light having a wavelength of 555nm after passing through the imaging optical lens 10. The field curvature S in fig. 4 is a field curvature in the sagittal direction, and T is a field curvature in the meridional direction.

In the present embodiment, the imaging optical lens 10 has an entrance pupil diameter of 3.032mm, a full field image height of 2.04mm, a diagonal field angle of 30.00 °, a large aperture, a long focal length, and a high profile, and has excellent optical characteristics.

(second embodiment)

Fig. 5 is a schematic structural diagram of the imaging optical lens 20 in the second embodiment, which is basically the same as the first embodiment, and the meanings of symbols in the following list are also the same as those in the first embodiment, so that the same parts are not described herein again, and only different points are listed below.

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

[ TABLE 5 ]

Table 6 shows aspherical surface data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.

[ TABLE 6 ]

Tables 7 and 8 show the inflected point and stagnation point design data of each lens in the imaging optical lens 20.

[ TABLE 7 ]

	Number of points of inflection	Position of reverse curvature 1	Position of reverse curvature 2
				P1R1	1	1.445
P1R2	2	0.625	1.015
				P2R1	0
P2R2	0
				P3R1	1	0.195
P3R2	2	0.385	0.975
				P4R1	1	1.325
P4R2	1	1.525
				P5R1	1	1.265
P5R2	2	1.655	1.855

[ TABLE 8 ]

	Number of stagnation points	Location of stagnation 1	Location of stagnation 2
				P1R1	0
P1R2	0
				P2R1	0
P2R2	0
				P3R1	1	0.335
P3R2	2	0.765	1.105
				P4R1	0
P4R2	0
				P5R1	0
P5R2	0

Table 17 below also lists values corresponding to various parameters in the second embodiment and parameters already defined in the conditional expressions.

Fig. 6 and 7 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm passing through the imaging optical lens 20, respectively. Fig. 8 is a schematic view showing curvature of field and distortion of light having a wavelength of 555nm after passing through the imaging optical lens 20. The field curvature S in fig. 8 is a field curvature in the sagittal direction, and T is a field curvature in the tangential direction.

In the present embodiment, the imaging optical lens 20 has an entrance pupil diameter of 3.043mm, a full field image height of 2.04mm, a diagonal field angle of 30.00 °, a large aperture, a long focal length, and a high profile, and has excellent optical characteristics.

(third embodiment)

Fig. 9 is a schematic structural diagram of an imaging optical lens 30 according to a third embodiment, which is basically the same as the first embodiment, and the meanings of symbols in the following list are also the same as those in the first embodiment, so that the same parts are not described again, and only different points are listed below.

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

[ TABLE 9 ]

Table 10 shows aspherical surface data of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.

[ TABLE 10 ]

Tables 11 and 12 show the inflected point and stagnation point design data of each lens in the imaging optical lens 30.

[ TABLE 11 ]

	Number of points of inflection	Position of reverse curvature 1	Position of reverse curvature 2
				P1R1	1	1.505
P1R2	0
				P2R1	2	0.505	0.755
P2R2	0
				P3R1	1	0.335
P3R2	1	1.035
				P4R1	1	1.585
P4R2	1	1.745
				P5R1	2	1.135	1.915
P5R2	0

[ TABLE 12 ]

	Number of stagnation points	Location of stagnation 1
			P1R1	0
P1R2	0
			P2R1	0
P2R2	0
			P3R1	1	0.575
P3R2	0
			P4R1	0
P4R2	0
			P5R1	0
P5R2	0

Table 17 below also lists values corresponding to various parameters in the third embodiment and the parameters specified in the conditional expressions.

Fig. 10 and 11 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm passing through the imaging optical lens 30, respectively. Fig. 12 is a schematic view showing curvature of field and distortion of light having a wavelength of 555nm after passing through the imaging optical lens 30. The field curvature S in fig. 12 is a field curvature in the sagittal direction, and T is a field curvature in the tangential direction.

In the present embodiment, the imaging optical lens 30 has an entrance pupil diameter of 3.172mm, a full field image height of 2.04mm, a diagonal field angle of 29.16 °, a large aperture, a long focal length, and a high profile, and has excellent optical characteristics.

(fourth embodiment)

Fig. 13 is a schematic structural diagram of an imaging optical lens 40 according to a fourth embodiment, which is basically the same as the first embodiment, and the meanings of symbols in the following list are also the same as those in the first embodiment, so that the same parts are not described again, and only different points are listed below.

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

[ TABLE 13 ]

Table 14 shows aspherical surface data of each lens in the imaging optical lens 40 according to the fourth embodiment of the present invention.

[ TABLE 14 ]

Tables 15 and 16 show the inflected point and stagnation point design data of each lens in the imaging optical lens 40.

[ TABLE 15 ]

	Number of points of inflection	Position of reverse curvature 1	Position of reverse curvature 2
				P1R1	1	1.405
P1R2	0
				P2R1	2	0.395	0.785
P2R2	0
				P3R1	1	0.215
P3R2	2	0.485	0.785
				P4R1	1	1.385
P4R2	1	1.565
				P5R1	2	1.325	1.975
P5R2	1	1.955

[ TABLE 16 ]

Table 17 below also lists values corresponding to various parameters in the fourth embodiment and the parameters specified in the conditional expressions.

Fig. 14 and 15 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm passing through the imaging optical lens 40, respectively. Fig. 16 is a schematic view showing curvature of field and distortion of light having a wavelength of 555nm after passing through the imaging optical lens 40. The field curvature S in fig. 16 is a field curvature in the sagittal direction, and T is a field curvature in the tangential direction.

In the present embodiment, the imaging optical lens 40 has an entrance pupil diameter of 3.059mm, a full field image height of 2.04mm, a diagonal field angle of 30.00 °, a large aperture, a long focal length, and a high profile, and has excellent optical characteristics.

Table 17 below lists the numerical values of the conditional expressions in the first embodiment, the second embodiment, the third embodiment, and the fourth embodiment, and the values of other relevant parameters, according to the conditional expressions.

[ TABLE 17 ]

Where Fno is the F-number of the diaphragm of the imaging optical lens.

While the foregoing is directed to embodiments of the present invention, it will be understood by those skilled in the art that various changes may be made without departing from the spirit and scope of the invention.

Claims

1. An imaging optical lens, comprising five lenses, in order from an object side to an image side: a first lens element with positive refractive power, a second lens element with negative refractive power, a third lens element with negative refractive power, a fourth lens element with positive refractive power, and a fifth lens element with negative refractive power;

wherein a focal length of the entire imaging optical lens is f, a focal length of the first lens is f1, a radius of curvature of an object-side surface of the second lens is R3, a radius of curvature of an object-side surface of the third lens is R5, a radius of curvature of an image-side surface of the third lens is R6, a radius of curvature of an object-side surface of the fourth lens is R7, a radius of curvature of an image-side surface of the fourth lens is R8, an on-axis thickness of the second lens is d3, an on-axis distance from the image-side surface of the second lens to the object-side surface of the third lens is d4, an on-axis thickness of the third lens is d5, and the following relations are satisfied:

0.35≤f1/f≤0.60；

3.50≤(R7+R8)/(R7-R8)≤15.00；

15.00≤R3/d3；

3.00≤d4/d5≤10.00；

1.85≤(R5+R6)/(R5-R6)≤5.00。

2. the imaging optical lens according to claim 1, wherein the second lens has a focal length f2 and satisfies the following relationship:

-0.90≤f2/f≤-0.60。

3. the imaging optical lens of claim 1, wherein 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 on-axis thickness of the first lens is d1, and an optical total length of the imaging optical lens is TTL and satisfies the following relationship:

-4.16≤(R1+R2)/(R1-R2)≤-0.45；

0.08≤d1/TTL≤0.32。

4. a photographic optical lens according to claim 1, wherein the radius of curvature of the image-side surface of the second lens element is R4, the total optical length of the photographic optical lens is TTL, and the following relationship is satisfied:

1.00≤(R3+R4)/(R3-R4)≤4.81；

0.02≤d3/TTL≤0.09。

5. a camera optical lens according to claim 1, wherein the focal length of the third lens element is f3, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied:

-5.07≤f3/f≤-0.40；

0.02≤d5/TTL≤0.06。

6. the image-capturing optical lens unit according to claim 1, wherein the focal length of the fourth lens element is f4, the on-axis thickness of the fourth lens element is d7, the total optical length of the image-capturing optical lens unit is TTL, and the following relationship is satisfied:

0.66≤f4/f≤33.03；

0.05≤d7/TTL≤0.17。

7. the imaging optical lens of claim 1, wherein the focal length of the fifth lens element is f5, the radius of curvature of the object-side surface of the fifth lens element is R9, the radius of curvature of the image-side surface of the fifth lens element is R10, the on-axis thickness of the fifth lens element is d9, the total optical length of the imaging optical lens element is TTL, and the following relationship is satisfied:

-7.89≤f5/f≤-0.82；

-11.24≤(R9+R10)/(R9-R10)≤-1.11；

0.02≤d9/TTL≤0.11。

8. a camera optical lens according to claim 1, wherein the total optical length of the camera optical lens is TTL and satisfies the following relation: f/TTL is more than or equal to 1.16.

9. An image-capturing optical lens according to claim 1, characterized in that the F-number of the aperture of the image-capturing optical lens is Fno and satisfies the following relation: fno is less than or equal to 2.52.

10. The imaging optical lens according to claim 1, wherein a combined focal length of the first lens and the second lens is f12, and the following relationship is satisfied: f12/f is more than or equal to 0.29 and less than or equal to 1.28.