CN110865448B

CN110865448B - Image pickup optical lens

Info

Publication number: CN110865448B
Application number: CN201911154146.0A
Authority: CN
Inventors: 王康; 马力
Original assignee: Chengrui Optics Changzhou Co Ltd
Current assignee: Chengrui Optics Changzhou Co Ltd
Priority date: 2019-11-22
Filing date: 2019-11-22
Publication date: 2021-07-02
Anticipated expiration: 2039-11-22
Also published as: WO2021097927A1; CN110865448A

Abstract

The invention provides a photographic optical lens, which sequentially comprises a first lens with negative refractive power, a second lens with positive 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 not less than 6.00 and not more than-3.00; (f2+ f4)/f is more than or equal to 1.80 and less than or equal to 2.50; d2/d1 is more than or equal to 1.00 and less than or equal to 2.00; 5.00-15.00 (R5+ R6)/(R5-R6); the photographic optical lens has good optical performance and also meets the design requirements of large aperture, wide angle and ultra-thinness.

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 ]

With the development of imaging technology, imaging optical lenses are widely used in various electronic products, such as smart phones and digital cameras. In order to be portable, people are increasingly pursuing the lightness and thinness of electronic products, and therefore, the small-sized image pickup optical lens with good imaging quality is the mainstream of the current market.

The camera optical lens on the traditional electronic product mostly adopts a four-piece type, five-piece type, six-piece type or even seven-piece type lens structure, however, along with the increase of diversified demands of users, because the focal power distribution and the lens shape setting of the existing lens structure are insufficient, the wide angle and the ultra-thinness of the camera optical lens are still insufficient.

Therefore, it is necessary to provide an imaging optical lens having excellent optical performance and satisfying design requirements for a wide angle and a slim profile.

[ summary of the invention ]

The invention aims to provide an imaging optical lens, aiming at solving the problems of insufficient wide angle and ultrathin of the traditional imaging optical lens.

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 negative refractive power, a second lens element with positive 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; the focal length of the entire imaging optical lens is f, the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the fourth lens is f4, the curvature radius of the object-side surface of the third lens is R5, the curvature radius of the image-side surface of the third lens is R6, the on-axis thickness of the first lens is d1, and the on-axis distance from the image-side surface of the first lens to the object-side surface of the second lens is d2, and the following relations are satisfied: f1/f is not less than 6.00 and not more than-3.00; (f2+ f4)/f is more than or equal to 1.80 and less than or equal to 2.50; d2/d1 is more than or equal to 1.00 and less than or equal to 2.00; 5.00-15.00 (R5+ R6)/(R5-R6).

Preferably, the curvature radius of the object-side surface of the fifth lens is R9, the curvature radius of the image-side surface of the fifth lens is R10, and the following relation is satisfied: 1.50 is less than or equal to (R9+ R10)/(R9-R10) is less than or equal to 4.00.

Preferably, 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 following relation is satisfied: d3/d4 is more than or equal to 2.00 and less than or equal to 5.00.

Preferably, a radius of curvature of the object-side surface of the first lens element is R1, a radius of curvature of the image-side surface of the first lens element is R2, and an optical total length of the image pickup optical lens is TTL, and satisfies the following relational expression: -7.00 ≤ (R1+ R2)/(R1-R2) 2.81; d1/TTL is more than or equal to 0.03 and less than or equal to 0.19.

Preferably, the curvature radius of the object-side surface of the second lens element is R3, the curvature radius of the image-side surface of the second lens element is R4, the on-axis thickness of the second lens element is d3, and the total optical length of the imaging optical lens system is TTL and satisfies the following relationship: f2/f is more than or equal to 0.55 and less than or equal to 2.08; (R3+ R4)/(R3-R4) is not more than 0.05 and not more than 0.99; d3/TTL is more than or equal to 0.06 and less than or equal to 0.24.

Preferably, the focal length of the third lens is f3, the on-axis thickness of the third lens is d5, the total optical length of the imaging optical lens is TTL, and the following relation is satisfied: f3/f is not less than 37.17 and not more than-3.15; d5/TTL is more than or equal to 0.02 and less than or equal to 0.08.

Preferably, a curvature radius of an object-side surface of the fourth lens element is R7, a curvature radius of an image-side surface of the fourth lens element is R8, an on-axis thickness of the fourth lens element is d7, an optical total length of the imaging optical lens system is TTL, and the following relationships are satisfied: f4/f is more than or equal to 0.35 and less than or equal to 1.73; (R7+ R8)/(R7-R8) is not more than 0.68 and not more than 3.59; d7/TTL is more than or equal to 0.05 and less than or equal to 0.32.

Preferably, the focal length of the fifth lens is f5, the on-axis thickness of the fifth lens is d9, the total optical length of the imaging optical lens is TTL, and the following relation is satisfied: f5/f is not less than-2.83 and not more than-0.47; d9/TTL is more than or equal to 0.03 and less than or equal to 0.15.

Preferably, the total optical length of the image pickup optical lens is TTL, the image height of the image pickup optical lens is IH, and the following relationship is satisfied: TTL/IH is less than or equal to 1.9.

Preferably, the field angle of the image pickup optical lens is FOV, the focal number of the image pickup optical lens is Fno, and the following relation is satisfied: the FOV is more than or equal to 100 degrees; fno is less than or equal to 2.40.

The invention has the beneficial effects that:

the camera optical lens provided by the invention has good optical performance and meets the design requirements of large aperture, wide angle and ultra-thinness.

[ description of the drawings ]

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;

fig. 17 is a schematic configuration diagram of an imaging optical lens of the fifth embodiment;

fig. 18 is a schematic view of axial aberrations of the image pickup optical lens shown in fig. 17;

fig. 19 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in fig. 17;

fig. 20 is a schematic view of curvature of field and distortion of the imaging optical lens shown in fig. 17.

[ 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, a first lens L1, a stop S1, 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 negative refractive power; the second lens element L2 has positive 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, it is defined that the focal length of the entire imaging optical lens 10 is f, the focal length of the first lens L1 is f1, the focal length of the second lens L2 is f2, the focal length of the fourth lens L4 is f4, the radius of curvature of the object-side surface of the third lens L3 is R5, the radius of curvature of the image-side surface of the third lens L3 is R6, the on-axis thickness of the first lens L1 is d1, and the on-axis distance from the image-side surface of the first lens L1 to the object-side surface of the second lens L2 is d2, and the following relational expressions are satisfied:

-6.00≤f1/f≤-3.00 (1)

1.80≤(f2+f4)/f≤2.50 (2)

1.00≤d2/d1≤2.00 (3)

5.00≤(R5+R6)/(R5-R6)≤15.00 (4)

the conditional expression (1) specifies the ratio of the focal length f2 of the first lens L1 to the total focal length f of the system, and contributes to the improvement of the optical system performance within the range of the conditional expression. Preferably, it satisfies-6.00. ltoreq. f 1/f. ltoreq-3.46.

When the conditional expression (2) satisfies the condition, the focal lengths of the third lens L3 and the fifth lens L5 can be properly matched to correct the aberration of the optical system, thereby improving the imaging quality. Preferably, 1.83 ≦ (f2+ f4)/f ≦ 2.50 is satisfied.

The conditional expression (3) specifies the ratio of the on-axis distance d2 from the image-side surface of the first lens L1 to the object-side surface of the second lens L2 to the on-axis thickness d1 of the first lens L1, and contributes to the processing of the lens and the assembly of the lens barrel within the range of the conditional expression. Preferably, 1.28. ltoreq. d2/d 1. ltoreq.1.90.

Conditional expression (4) specifies the shape of the third lens L3, and can alleviate the degree of deflection of the light passing through the lens, thereby effectively reducing the aberration. 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: 1.50 ≦ (R9+ R10)/(R9-R10) ≦ 4.00, defines the shape of the fifth lens L5, and facilitates lens processing within a range of conditions. Preferably, 1.50 ≦ (R9+ R10)/(R9-R10). ltoreq.3.54 is satisfied.

The on-axis thickness of the second lens L2 is d3, and the on-axis distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3 is d4, which satisfies the following relationship: 2.00. ltoreq. d3/d 4. ltoreq.5.00, the ratio of the on-axis distance d4 from the image-side surface of the second lens L2 to the object-side surface of the third lens L3 to the on-axis thickness d3 of the second lens L2 is defined, which is advantageous in terms of the overall length of the compression system. Preferably, 2.36. ltoreq. d3/d 4. ltoreq.4.82 is satisfied.

In the present embodiment, the curvature radius of the object-side surface of the first lens L1 is R1, and the curvature radius of the image-side surface of the first lens L1 is R2, and the following relationships are satisfied: 7.00 ≦ (R1+ R2)/(R1-R2) ≦ 2.81, and the shape of the first lens L1 is controlled appropriately so that the first lens L1 can correct the system spherical aberration effectively. Preferably, it satisfies-4.37. ltoreq. (R1+ R2)/(R1-R2). ltoreq.2.24.

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 0.03 and less than or equal to 0.19, and ultra-thinning is facilitated. Preferably, 0.05. ltoreq. d 1/TTL. ltoreq.0.15 is satisfied.

The focal length of the second lens L2 is f2, and the following relation is satisfied: f2/f is more than or equal to 0.55 and less than or equal to 2.08, and the positive focal power of the second lens L2 is controlled in a reasonable range, so that the aberration of the optical system can be corrected. Preferably, 0.88. ltoreq. f 2/f. ltoreq.1.66 is satisfied.

The curvature radius of the object side surface of the second lens L2 is R3, the curvature radius of the image side surface of the second lens L2 is R4, and the following relations are satisfied: the second lens L2 is defined in a shape of (R3+ R4)/(R3-R4) of 0.05 to 0.99, and the problem of chromatic aberration on the axis can be corrected favorably as the lens is brought to an ultra-thin wide angle within the range. Preferably, 0.08. ltoreq. (R3+ R4)/(R3-R4.) or less than 0.80 is satisfied.

The on-axis thickness of the second lens L2 is d3, and satisfies the following relation: d3/TTL is more than or equal to 0.06 and less than or equal to 0.24, and ultra-thinning is facilitated. Preferably, 0.10. ltoreq. d 3/TTL. ltoreq.0.19 is satisfied.

The focal length of the third lens L3 is f3, and the following relationship is satisfied: 37.17 f3/f 3.15, which makes the system have better imaging quality and lower sensitivity through reasonable distribution of the optical power. Preferably, it satisfies-23.23. ltoreq. f 3/f. ltoreq-3.93.

The on-axis thickness of the third lens L3 is d5, and satisfies the following relation: d5/TTL is more than or equal to 0.02 and less than or equal to 0.08, and ultra-thinning is facilitated. Preferably, 0.03. ltoreq. d 3/TTL. ltoreq.0.07 is satisfied.

The focal length of the fourth lens L4 is f4, and the following relationship is satisfied: f4/f is more than or equal to 0.35 and less than or equal to 1.73, and the system has better imaging quality and lower sensitivity through reasonable distribution of the focal power. Preferably, 0.56. ltoreq. f 4/f. ltoreq.1.39 is satisfied.

The curvature radius of the object side surface of the fourth lens L4 is R7, the curvature radius of the image side surface of the fourth lens L4 is R8, and the following relations are satisfied: the shape of the fourth lens L4 is defined to be not less than 0.68 (R7+ R8)/(R7-R8) and not more than 3.59, and when the shape is within the range, the aberration of the off-axis picture angle is favorably corrected along with the development of the ultrathin wide angle. Preferably, 1.09 ≦ (R7+ R8)/(R7-R8) ≦ 2.88 is satisfied.

The on-axis thickness of the fourth lens L4 is d7, and satisfies the following relation: d7/TTL is more than or equal to 0.05 and less than or equal to 0.32, and ultra-thinning is facilitated. Preferably, 0.09. ltoreq. d 7/TTL. ltoreq.0.26 is satisfied.

The focal length f5 of the fifth lens L5 satisfies the following relation: f5/f is less than or equal to-0.47, 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-1.77. ltoreq. f 5/f. ltoreq-0.59.

The fifth lens L5 has an on-axis thickness d9, and satisfies the following relationship: d9/TTL is more than or equal to 0.03 and less than or equal to 0.15, and ultra-thinning is facilitated. Preferably, 0.05. ltoreq. d 9/TTL. ltoreq.0.12 is satisfied.

In this embodiment, the total optical length TTL of the image pickup optical lens 10 is less than or equal to 6.11 mm, which is beneficial to achieving ultra-thinning. Preferably, the total optical length TTL is less than or equal to 5.84 millimeters.

In the present embodiment, the number Fno of focal numbers of the imaging optical lens 10 is less than or equal to 2.40. The large aperture is large, and the imaging performance is good. Preferably, the F-number is less than or equal to 2.38. 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 the present embodiment: the ratio of the total optical length TTL to the image height IH of the image pickup optical lens is smaller than or equal to 1.90, so that ultra-thinning can be realized.

In the present embodiment: the field angle FOV of the camera optical lens is more than or equal to 100 degrees, so that the wide angle is realized.

In this way, the imaging optical lens 10 can satisfy design requirements for a large aperture and an ultra-thin structure while having good optical imaging performance.

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, diaphragm;

r is the curvature radius of the optical surface and the central curvature radius when the lens is used;

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

r2 radius of curvature of image side surface of first lens L1;

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

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

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

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

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

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

r9 radius of curvature of object-side surface of fifth lens L5;

r10 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 radius of curvature of image side of optical filter GF;

d is the on-axis thickness of the lenses and the 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;

d1: the on-axis thickness of the first lens L1;

d2: the on-axis distance from the image-side surface of the first lens L1 to the object-side surface of the second lens L2;

d3: the on-axis thickness of the second lens L2;

d4: the on-axis distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3;

d5: 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 is the refractive index of the d line;

nd1 refractive index of d-line of the first lens L1;

nd2 refractive index of d-line of the second lens L2;

nd3 refractive index of d-line of the third lens L3;

nd4 refractive index of d-line of the fourth lens L4;

nd5 refractive index of d-line of the fifth lens L5;

ndg, refractive index of d-line of optical filter GF;

vd is 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
				P1R1	1	0.585
P1R2	1	0.335
				P2R1	1	0.475
P2R2	0
				P3R1	1	0.315
P3R2	1	0.475
				P4R1	2	0.535	1.245
P4R2	1	0.875
				P5R1	2	0.405	1.625
P5R2	1	0.505

[ TABLE 4 ]

	Number of stagnation points	Location of stagnation 1
			P1R1	1	1.185
P1R2	1	0.605
			P2R1	0
P2R2	0
			P3R1	1	0.535
P3R2	1	1.085
			P4R1	1	1.175
P4R2	1	1.365
			P5R1	1	0.775
P5R2	1	1.385

Table 21 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, 640nm, 555nm, 510nm, 470nm, and 430nm 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 0.820mm, a full field image height of 2.950mm, a diagonal field angle of 116.20 °, a large aperture, a wide angle, and a thin 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	0.605
P1R2	1	0.355
				P2R1	1	0.455
P2R2	0
				P3R1	1	0.255
P3R2	1	0.455
				P4R1	2	0.755	1.195
P4R2	1	0.855
				P5R1	1	0.445
P5R2	1	0.505

[ TABLE 8 ]

	Number of stagnation points	Location of stagnation 1
			P1R1	1	1.225
P1R2	1	0.625
			P2R1	0
P2R2	0
			P3R1	1	0.445
P3R2	1	1.015
			P4R1	0
P4R2	1	1.295
			P5R1	1	0.755
P5R2	1	1.365

Table 21 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, 640nm, 555nm, 510nm, 470nm, and 430nm 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 0.849mm, a full field image height of 2.950mm, a diagonal field angle of 114.00 °, a large aperture, a wide angle, 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	Position of reverse curvature 3
					P1R1	2	0.425	1.655	0
P1R2	1	0.205	0	0
					P2R1	1	0.605	0	0
P2R2	0	0	0	0
					P3R1	1	0.365	0	0
P3R2	1	0.545	0	0
					P4R1	3	0.415	1.255	1.355
P4R2	1	1.015	0	0
					P5R1	2	0.405	1.605	0
P5R2	2	0.495	2.375	0

[ TABLE 12 ]

	Number of stagnation points	Location of stagnation 1
			P1R1	1	0.795
P1R2	1	0.345
			P2R1	0
P2R2	0
			P3R1	1	0.625
P3R2	1	1.155
			P4R1	1	0.795
P4R2	1	1.565
			P5R1	1	0.795
P5R2	1	1.415

Table 21 below also lists values corresponding to various parameters in the third embodiment and parameters already defined 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, 640nm, 555nm, 510nm, 470nm, and 430nm 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 10 has an entrance pupil diameter of 1.020mm, a full field height of 2.950mm, a diagonal field angle of 116.20 °, a large aperture, a wide angle, 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	Position of reverse curvature 3
					P1R1	1	0.845
P1R2	1	0.635
					P2R1	1	0.325
P2R2	0
					P3R1	1	0.225
P3R2	3	0.395	0.735	0.835
					P4R1	2	0.465	0.795
P4R2	1	0.775
					P5R1	2	0.275	1.145
P5R2	1	0.385

[ TABLE 16 ]

	Number of stagnation points	Location of stagnation 1	Location of stagnation 2
				P1R1	0
P1R2	1	0.695
				P2R1	1	0.445
P2R2	0
				P3R1	1	0.385
P3R2	0
				P4R1	2	0.735	0.835
P4R2	1	1.045
				P5R1	1	0.505
P5R2	1	0.965

Table 21 below also lists values corresponding to various parameters in the fourth embodiment and parameters already defined 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, 470nm, and 435nm, respectively, passing through the imaging optical lens 40. 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 10 has an entrance pupil diameter of 0.787mm, a full field image height of 2.285mm, a diagonal field angle of 101.80 °, a wide angle, and a thin profile, and has excellent optical characteristics.

(fifth embodiment)

Fig. 17 is a schematic structural diagram of an imaging optical lens 50 according to a fifth 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 17 and 18 show design data of the imaging optical lens 50 according to the fifth embodiment of the present invention.

[ TABLE 17 ]

Table 18 shows aspherical surface data of each lens in the imaging optical lens 50 according to the fifth embodiment of the present invention.

[ TABLE 18 ]

Tables 19 and 20 show the inflected point and stagnation point design data of each lens in the imaging optical lens 50.

[ TABLE 19 ]

	Number of points of inflection	Position of reverse curvature 1	Position of reverse curvature 2
				P1R1	1	0.835
P1R2	0
				P2R1	1	0.275
P2R2	0
				P3R1	1	0.205
P3R2	1	0.425
				P4R1	2	0.595	0.855
P4R2	1	0.795
				P5R1	2	0.275	1.255
P5R2	2	0.405	1.815

[ TABLE 20 ]

	Number of stagnation points	Location of stagnation 1
			P1R1	0
P1R2	0
			P2R1	1	0.395
P2R2	0
			P3R1	1	0.375
P3R2	1	0.835
			P4R1	0
P4R2	1	1.055
			P5R1	1	0.535
P5R2	1	1.085

Table 21 below also lists values corresponding to various parameters in the fifth embodiment and parameters already defined in the conditional expressions.

Fig. 18 and 19 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm, and 435nm, respectively, passing through the imaging optical lens 50. Fig. 20 is a schematic view showing curvature of field and distortion of light having a wavelength of 555nm after passing through the imaging optical lens 50. The field curvature S in fig. 20 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 has an entrance pupil diameter of 0.737mm, a full field image height of 2.285mm, a diagonal field angle of 105.00 °, a large aperture, a wide angle, and a thin profile, and has excellent optical characteristics.

The following table 21 lists values corresponding to the conditional expressions in the first embodiment, the second embodiment, the third embodiment, the fourth embodiment, and the fifth embodiment, and values of other relevant parameters, based on the conditional expressions.

[ TABLE 21 ]

Parameter and condition formula	Example 1	Example 2	Example 3	Example 4	Example 5
						f1/f	-6.000	-5.954	-4.655	-3.925	-3.919
(f2+f4)/f	2.500	1.800	2.166	2.044	2.207
						d2/d1	1.639	1.552	1.807	1.784	1.700
(R5+R6)/(R5-R6)	14.976	5.000	10.008	8.220	5.062
						f	1.960	2.029	2.084	1.889	1.770
f1	-11.760	-12.081	-9.700	-7.414	-6.937
						f2	2.633	2.223	2.886	2.399	2.008
f3	-36.431	-11.418	-23.054	-15.217	-8.357
						f4	2.267	1.430	1.627	1.462	1.898
f5	-2.770	-1.439	-1.933	-1.699	-2.167
						f12	2.681	2.157	3.308	3.176	2.480
Fno	2.390	2.390	2.043	2.400	2.402

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 negative refractive power, a second lens element with positive 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;

the focal length of the entire imaging optical lens is f, the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the fourth lens is f4, the curvature radius of the object-side surface of the third lens is R5, the curvature radius of the image-side surface of the third lens is R6, the on-axis thickness of the first lens is d1, and the on-axis distance from the image-side surface of the first lens to the object-side surface of the second lens is d2, and the following relations are satisfied:

-6.00≤f1/f≤-3.00；

1.80≤(f2+f4)/f≤2.50；

1.00≤d2/d1≤2.00；

8.22≤(R5+R6)/(R5-R6)≤15.00。

2. the imaging optical lens according to claim 1, wherein a radius of curvature of an object-side surface of the fifth lens element is R9, a radius of curvature of an image-side surface of the fifth lens element is R10, and the following relational expression is satisfied:

1.50≤(R9+R10)/(R9-R10)≤4.00。

3. the imaging optical lens according to claim 1, wherein an on-axis thickness of the second lens is d3, an on-axis distance from an image-side surface of the second lens to an object-side surface of the third lens is d4, and the following relationship is satisfied:

2.00≤d3/d4≤5.00。

4. the imaging optical lens of claim 1, wherein the radius of curvature of the object-side surface of the first lens element is R1, the radius of curvature of the image-side surface of the first lens element is R2, the total optical length of the imaging optical lens is TTL, and the following relationships are satisfied:

-7.00≤(R1+R2)/(R1-R2)≤2.81；

0.03≤d1/TTL≤0.19。

5. the image-capturing optical lens unit according to claim 1, wherein the radius of curvature of the object-side surface of the second lens element is R3, the radius of curvature of the image-side surface of the second lens element is R4, the on-axis thickness of the second lens element is d3, the total optical length of the image-capturing optical lens unit is TTL, and the following relationships are satisfied:

0.55≤f2/f≤2.08；

0.05≤(R3+R4)/(R3-R4)≤0.99；

0.06≤d3/TTL≤0.24。

6. the image-capturing optical lens of claim 1, wherein the focal length of the third lens is f3, the on-axis thickness of the third lens is d5, the total optical length of the image-capturing optical lens is TTL, and the following relationship is satisfied:

-37.17≤f3/f≤-3.15；

0.02≤d5/TTL≤0.08。

7. the image-capturing optical lens unit according to claim 1, wherein the radius of curvature of the object-side surface of the fourth lens element is R7, the radius of curvature of the image-side surface of the fourth lens element is R8, 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 relationships are satisfied:

0.35≤f4/f≤1.73；

0.68≤(R7+R8)/(R7-R8)≤3.59；

0.05≤d7/TTL≤0.32。

8. the image-capturing optical lens of claim 1, wherein the focal length of the fifth lens element is f5, the on-axis thickness of the fifth lens element is d9, the total optical length of the image-capturing optical lens is TTL, and the following relationship is satisfied:

-2.83≤f5/f≤-0.47；

0.03≤d9/TTL≤0.15。

9. a camera optical lens according to claim 1, wherein the total optical length of the camera optical lens is TTL, the image height of the camera optical lens is IH, and the following relationship is satisfied:

TTL/IH≤1.9。

10. the imaging optical lens according to claim 1, wherein an angle of view of the imaging optical lens is FOV, a focal number of the imaging optical lens is Fno, and the following relational expression is satisfied:

FOV≥100°；

Fno≤2.40。