CN111142225A

CN111142225A - Image pickup optical lens

Info

Publication number: CN111142225A
Application number: CN201911340780.3A
Authority: CN
Inventors: 许民益
Original assignee: Ruisheng Communication Technology Changzhou Co Ltd
Current assignee: AAC Communication Technologies Changzhou Co Ltd; Ruisheng Communication Technology Changzhou Co Ltd
Priority date: 2019-12-23
Filing date: 2019-12-23
Publication date: 2020-05-12
Anticipated expiration: 2039-12-23
Also published as: CN111142225B

Abstract

The invention relates to the field of optical lenses, and discloses an image pickup optical lens, which sequentially comprises 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 positive refractive power, a fourth lens element with positive refractive power, a fifth lens element with negative refractive power, and a sixth lens element with positive refractive power; the abbe number of the second lens is v2, the abbe number of the third lens is v3, the radius of curvature of the object-side surface of the sixth lens is R11, the radius of curvature of the image-side surface of the sixth lens is R12, and the following relations are satisfied: v3/v2 is more than or equal to 2.80 and less than or equal to 4.30; the ratio of (R11+ R12)/(R11-R12) is more than or equal to-20.00 and less than or equal to-1.50. The camera optical lens meets the requirements of ultra-thinning and long focal length and has good optical performance.

Description

Image pickup optical lens

Technical Field

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

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 image pickup optical lens having excellent optical characteristics is urgently required.

Disclosure of Invention

In view of the above problems, an object of the present invention is to provide an imaging optical lens having excellent optical performance while satisfying ultra-thinning and a long focal length.

To solve the above-mentioned problems, an embodiment of the present invention provides an imaging optical lens, in order from an object side to an image side, comprising: a first lens element with positive refractive power, a second lens element with negative refractive power, a third lens element with positive refractive power, a fourth lens element with positive refractive power, a fifth lens element with negative refractive power, and a sixth lens element with positive refractive power;

the abbe number of the second lens is v2, the abbe number of the third lens is v3, the radius of curvature of the object-side surface of the sixth lens is R11, the radius of curvature of the image-side surface of the sixth lens is R12, and the following relations are satisfied:

2.80≤v3/v2≤4.30；

-20.00≤(R11+R12)/(R11-R12)≤-1.50。

preferably, the radius of curvature of the object-side surface of the second lens is R3, the radius of curvature of the image-side surface of the second lens is R4, and the following relationship is satisfied:

3.00≤R3/R4≤20.00。

preferably, the focal length of the image pickup optical lens is f, the focal length of the sixth lens is f6, and the following relationship is satisfied:

0.40≤f6/f≤0.80。

preferably, the focal length of the image capturing optical lens is f, the focal length of the first lens element is f1, 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 on-axis thickness of the first lens element is d1, the total optical length of the image capturing optical lens is TTL, and the following relationships are satisfied:

0.30≤f1/f≤1.60；

-10.78≤(R1+R2)/(R1-R2)≤-0.55；

0.05≤d1/TTL≤0.31。

preferably, the focal length of the image capturing optical lens is f, the focal length of the second lens element is f2, 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 is TTL, and the following relationships are satisfied:

-0.77≤f2/f≤-0.18；

0.55≤(R3+R4)/(R3-R4)≤2.76；

0≤d3/TTL≤0.04。

preferably, the focal length of the image capturing optical lens is f, the focal length of the third lens element is f3, the radius of curvature of the object-side surface of the third lens element is R5, the radius of curvature of the image-side surface of the third lens element is R6, the on-axis thickness of the third lens element is d5, the total optical length of the image capturing optical lens is TTL, and the following relationships are satisfied:

0.15≤f3/f≤0.87；

-4.62≤(R5+R6)/(R5-R6)≤0.21；

0.03≤d5/TTL≤0.09。

preferably, the focal length of the image capturing optical lens is f, the focal length of the fourth lens element is f4, 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 is TTL, and the following relationships are satisfied:

0.44≤f4/f≤2.68；

-7.88≤(R7+R8)/(R7-R8)≤0.78；

0.01≤d7/TTL≤0.08。

preferably, the focal length of the image capturing optical lens is f, 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 image capturing optical lens is TTL, and the following relationships are satisfied:

-1.52≤f5/f≤-0.21；

0.31≤(R9+R10)/(R9-R10)≤4.63；

0.01≤d9/TTL≤0.03。

preferably, the focal length of the image pickup optical lens is f, and the combined focal length of the first lens and the second lens is f12, and the following relationship is satisfied:

-31.07≤f12/f≤-0.51。

preferably, the first lens is made of plastic, the second lens is made of plastic, the third lens is made of glass, the fourth lens is made of plastic, the fifth lens is made of plastic, and the sixth lens is made of plastic.

The invention has the beneficial effects that: the pick-up optical lens meets the requirements of ultra-thinning and long focal length and has good optical performance, and is particularly suitable for a mobile phone pick-up lens component and a WEB pick-up lens which are composed of pick-up elements such as CCD and CMOS for high pixel.

Drawings

Fig. 1 is a schematic configuration diagram of an imaging optical lens according to a first embodiment of the present invention;

FIG. 2 is a schematic axial aberration diagram of the imaging optical lens of 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 of FIG. 1;

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

FIG. 6 is a schematic axial aberration diagram of the imaging optical lens of 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 of FIG. 5;

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

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 of FIG. 9;

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

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

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 the drawings, the present invention provides an image pickup optical lens 10. Fig. 1 shows an imaging optical lens 10 according to a first embodiment of the present invention, and the imaging optical lens 10 includes six lenses. Specifically, the imaging optical lens 10, in order from an object side to an image side, includes: a diaphragm S1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6. An optical element such as an optical filter (filter) GF may be disposed between the sixth lens L6 and the image plane Si.

The first lens L1 is made of plastic, the second lens L2 is made of plastic, the third lens L3 is made of glass, the fourth lens L4 is made of plastic, the fifth lens L5 is made of plastic, and the sixth lens L6 is made of plastic. By rationalizing the material of the lens, the lens has good optical performance while being ultrathin and long in focal length.

The abbe number of the second lens L2 is defined as v2, the abbe number of the third lens L3 is defined as v3, v3/v2 is defined as 2.80-4.30, and the ratio of the abbe number of the third lens L3 to the abbe number of the second lens L2 is defined, so that the condition range is more favorable for the development of ultrathin lens and correction of aberration. Preferably, 2.81 ≦ v3/v2 ≦ 4.26 is satisfied.

The curvature radius of the object side surface of the sixth lens L6 is defined as R11, the curvature radius of the image side surface of the sixth lens L6 is defined as R12, -20.00 ≦ (R11+ R12)/(R11-R12) ≦ -1.50, and the shape of the sixth lens L6 is defined so as to be advantageous for correcting off-axis angular aberration within the range of the conditional expressions. Preferably, it satisfies-19.49 ≦ (R11+ R12)/(R11-R12). ltoreq.1.60.

In the imaging optical lens 10 according to the present invention, when the abbe number of the relevant lens, the curvature radius of the object-side surface, and the curvature radius of the image-side surface satisfy the above relationship, the imaging optical lens 10 can have excellent optical performance while satisfying ultra-thinning and a long focal length.

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, R3/R4 is more than or equal to 3.00 and less than or equal to 20.00, and the shape of the second lens L2 is defined, so that the deflection degree of light rays passing through the lens can be alleviated and the aberration can be effectively reduced within the conditional expression range. Preferably, 3.19. ltoreq. R3/R4. ltoreq.19.75 is satisfied.

The focal length of the whole shooting optical lens 10 is defined as f, the focal length of the sixth lens L6 is f6, f6/f is more than or equal to 0.40 and less than or equal to 0.80, the ratio of the focal length of the sixth lens L6 to the total focal length is specified, and the system has better imaging quality and lower sensitivity through reasonable distribution of focal power. Preferably, 0.41. ltoreq. f 6/f. ltoreq.0.80 is satisfied.

The focal length of the first lens L1 is f1, f1/f is more than or equal to 0.30 and less than or equal to 1.60, and the ratio of the focal length of the first lens L1 to the total focal length is specified. In this conditional expression range, the first lens element L1 has a proper positive refractive power, which is beneficial to reducing system aberration and facilitating the development of the lens to be ultra-thin. Preferably, 0.48. ltoreq. f 1/f. ltoreq.1.28 is satisfied.

The curvature radius of the object side surface of the first lens L1 is R1, the curvature radius of the image side surface of the first lens L1 is R2, the curvature radius of-10.78 (R1+ R2)/(R1-R2) is less than or equal to-0.55, and the shape of the first lens L1 is reasonably controlled, so that the first lens L1 can effectively correct the system spherical aberration. Preferably, it satisfies-6.74 ≦ (R1+ R2)/(R1-R2). ltoreq.0.69.

The on-axis thickness of the first lens L1 is d1, the total optical length of the imaging optical lens system 10 is TTL, and the following relationship is satisfied: d1/TTL is more than or equal to 0.05 and less than or equal to 0.31, and ultra-thinning is facilitated. Preferably, 0.08. ltoreq. d 1/TTL. ltoreq.0.25 is satisfied.

The focal length of the second lens L2 is f2, and the following relation is satisfied: 0.77 f2/f 0.18, which is advantageous for correcting the aberration of the optical system by controlling the negative power of the second lens L2 in a reasonable range. Preferably, it satisfies-0.48. ltoreq. f 2/f. ltoreq-0.23.

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 and less than or equal to 0.04, and ultra-thinning is facilitated. Preferably, 0.01. ltoreq. d 3/TTL. ltoreq.0.03 is satisfied.

The radius of curvature R3 of the object-side surface and the radius of curvature R4 of the image-side surface of the second lens L2 satisfy the following relationship: the shape of the second lens L2 is regulated to be not less than 0.55 and not more than (R3+ R4)/(R3-R4) and not more than 2.76, and when the shape is within the conditional expression range, the deflection degree of the light rays passing through the lens can be alleviated, and the aberration can be effectively reduced. Preferably, 0.89. ltoreq. (R3+ R4)/(R3-R4). ltoreq.2.21 is satisfied.

The focal length of the third lens L3 is f3, f3/f is more than or equal to 0.15 and less than or equal to 0.87, and the system has better imaging quality and lower sensitivity through reasonable distribution of focal power. Preferably, 0.24. ltoreq. f 3/f. ltoreq.0.70 is satisfied.

The curvature radius of the object side surface of the third lens L3 is R5, the curvature radius of the image side surface of the third lens L3 is R6, and the following relations are satisfied: 4.62 ≦ (R5+ R6)/(R5-R6) ≦ 0.21, the shape of the third lens L3 can be effectively controlled, the molding of the third lens L3 is facilitated, the deflection degree of the light passing through the lens can be alleviated within the range specified by the conditional expression, and the aberration can be effectively reduced. Preferably, it satisfies-2.89 ≦ (R5+ R6)/(R5-R6). ltoreq.0.16.

The on-axis thickness of the third lens L3 is d5, and satisfies the following relation: d5/TTL is more than or equal to 0.03 and less than or equal to 0.09, and ultra-thinning is facilitated. Preferably, 0.04. ltoreq. d 5/TTL. ltoreq.0.08 is satisfied.

The focal length of the fourth lens L4 is f4, f4/f is more than or equal to 0.44 and less than or equal to 2.68, and the system has better imaging quality and lower sensitivity through reasonable distribution of focal power. Preferably, 0.70. ltoreq. f 4/f. ltoreq.2.15 is satisfied.

The radius of curvature of the object-side surface of the fourth lens L4 is R7, and the radius of curvature of the image-side surface of the fourth lens L4 is R8, -7.88 ≦ (R7+ R8)/(R7-R8) ≦ 0.78, and the shape of the fourth lens L4 is defined. Preferably, it satisfies-4.92. ltoreq. (R7+ R8)/(R7-R8). ltoreq.0.63.

The on-axis thickness of the fourth lens L4 is d7, and satisfies the following relation: d7/TTL is more than or equal to 0.01 and less than or equal to 0.08, and ultra-thinning is facilitated. Preferably, 0.02. ltoreq. d 7/TTL. ltoreq.0.06 is satisfied.

The focal length of the fifth lens L5 is f5, -1.52 ≦ f5/f ≦ -0.21, and the system has better imaging quality and lower sensitivity through reasonable distribution of the optical power. Preferably, it satisfies-0.95. ltoreq. f 5/f. ltoreq-0.27.

The curvature radius R9 of the object side surface of the fifth lens L5 and the curvature radius R10 of the image side surface of the fifth lens L5 satisfy the following relations: the shape of the fifth lens L5 is defined to be 0.31 ≦ (R9+ R10)/(R9-R10) ≦ 4.63, and when within this conditional expression, it is advantageous to correct the problem of aberration of the off-axis angle and the like with the progress of thinning. Preferably, 0.50. ltoreq. (R9+ R10)/(R9-R10). ltoreq.3.70 is satisfied.

The fifth lens L5 has an on-axis thickness d9, and satisfies the following relationship: d9/TTL is more than or equal to 0.01 and less than or equal to 0.03, and ultra-thinning is facilitated. Preferably, 0.01. ltoreq. d 9/TTL. ltoreq.0.02 is satisfied.

The on-axis thickness of the sixth lens L6 is d11, and satisfies the following relation: d11/TTL is more than or equal to 0.01 and less than or equal to 0.06, and ultra-thinning is facilitated. Preferably, 0.02. ltoreq. d 11/TTL. ltoreq.0.05 is satisfied.

In this embodiment, the combined focal length of the first lens L1 and the second lens L2 is defined as f12, and the following relation is satisfied: 31.07 ≦ f12/f ≦ -0.51, in this conditional expression range, the aberration and distortion of the photographing optical lens 10 can be eliminated, and the back focal length of the photographing optical lens 10 can be suppressed, maintaining the miniaturization of the image lens system set. Preferably-19.42. ltoreq. f 12/f. ltoreq-0.64.

In this embodiment, the total optical length TTL of the image pickup optical lens 10 is less than or equal to 13.93 millimeters, which is beneficial to achieving ultra-thinning. Preferably, the total optical length TTL is less than or equal to 13.29 millimeters.

In the present embodiment, the number of apertures F of the imaging optical lens 10 is 3.50 or less. The large aperture is large, and the imaging performance is good. Preferably, the F-number is less than or equal to 3.43.

With such a design, the total optical length TTL of the entire imaging optical lens 10 can be made as short as possible, and the characteristic of miniaturization can be maintained.

The image pickup optical lens 10 of the present invention will be explained below by way of example. The symbols described in the respective examples are as follows. The unit of focal length, on-axis distance, curvature radius, on-axis thickness, position of reverse curvature and position of stagnation point is mm.

TTL: optical length (on-axis distance from the object side surface of the 1 st lens L1 to the image forming surface) in mm;

preferably, the object side surface and/or the image side surface of the lens may be further provided with an inflection point and/or a stagnation point to meet the requirement of high-quality imaging.

Tables 1 and 2 show design data of the imaging optical lens 10 according to the first embodiment of the present invention.

[ TABLE 1 ]

Wherein each symbol has the following meaning.

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: a radius of curvature of the object side surface of the sixth lens L6;

r12: a radius of curvature of the image-side surface of the sixth lens L6;

r13: radius of curvature of the object side of the optical filter GF;

r14: 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: an on-axis distance from an image-side surface of the fifth lens L5 to an object-side surface of the sixth lens L6;

d 11: the on-axis thickness of the sixth lens L6;

d 12: the on-axis distance from the image-side surface of the sixth lens L6 to the object-side surface of the optical filter GF;

d 13: on-axis thickness of the optical filter GF;

d 14: 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;

nd 6: the refractive index of the d-line of the sixth lens L6;

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;

v 6: abbe number of the sixth lens L6;

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 ]

Wherein k is a conic coefficient, and A4, A6, A8, A10, A12, A14, A16, A18, A20 are aspheric 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 stagnation point design data of each lens in the imaging optical lens 10 according to the first embodiment of the present invention. 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, P5R1 and P5R2 represent the object-side surface and the image-side surface of the fifth lens L5, and P6R1 and P6R2 represent the object-side surface and the image-side surface of the sixth lens L6, 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
					P1R1	0
P1R2	0
					P2R1	1	0.595
P2R2	1	1.535
					P3R1	0
P3R2	0
					P4R1	0
P4R2	1	1.035
					P5R1	0
P5R2	1	1.415
					P6R1	3	0.785	1.135	1.645
P6R2	2	0.605	1.325

[ TABLE 4 ]

	Number of stagnation points	Location of stagnation 1	Location of stagnation 2
				P1R1	0
P1R2	0
				P2R1	1	0.975
P2R2	0
				P3R1	0
P3R2	0
				P4R1	0
P4R2	1	1.355
				P5R1	0
P5R2	1	1.575
				P6R1	0
P6R2	2	1.155	1.445

Fig. 2 and 3 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 486nm, 588nm, and 656nm passing through the imaging optical lens 10 according to the first embodiment. Fig. 4 is a schematic view showing curvature of field and distortion of light having a wavelength of 588nm after passing through the imaging optical lens 10 according to the first embodiment, where S is curvature of field in the sagittal direction and T is curvature of field in the tangential direction in fig. 4.

Table 17 appearing later shows values corresponding to the parameters specified in the conditional expressions for the respective numerical values in examples 1, 2, 3, and 4.

As shown in table 17, the first embodiment satisfies each conditional expression.

In the present embodiment, the imaging optical lens has an entrance pupil diameter of 4.252mm, a full field image height of 2.502mm, and a diagonal field angle of 19.50 °. The effective focal length EFL is 14.456, the total optical length TTL is 12.660, the EFL/TTL is 1.142, the optical lens is long-focus and ultra-thin, the on-axis and off-axis chromatic aberration is fully corrected, and the optical lens has excellent optical characteristics.

(second embodiment)

The second embodiment is basically the same as the first embodiment, the same reference numerals as in the first embodiment, and only different points will be described 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 inflection point and stagnation point design data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.

[ TABLE 7 ]

	Number of points of inflection	Position of reverse curvature 1	Position of reverse curvature 2
				P1R1	0
P1R2	1	0.405
				P2R1	1	1.485
P2R2	1	1.305
				P3R1	0
P3R2	2	0.535	1.205
				P4R1	1	0.995
P4R2	0
				P5R1	1	0.055
P5R2	1	0.545
				P6R1	1	0.575
P6R2	1	0.385

[ TABLE 8 ]

	Number of stagnation points	Location of stagnation 1	Location of stagnation 2
				P1R1	0
P1R2	1	0.695
				P2R1	0
P2R2	0
				P3R1	0
P3R2	2	0.855	1.355
				P4R1	1	1.145
P4R2	0
				P5R1	1	0.095
P5R2	1	1.055
				P6R1	1	0.995
P6R2	1	0.645

Fig. 6 and 7 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 486nm, 588nm and 656nm passing through the imaging optical lens 20 according to the second embodiment. Fig. 8 is a schematic view showing curvature of field and distortion of light having a wavelength of 588nm after passing through the imaging optical lens 20 according to the second embodiment.

As shown in table 17, the second embodiment satisfies each conditional expression.

In the present embodiment, the imaging optical lens has an entrance pupil diameter of 3.529mm, a full field image height of 2.502mm, and a diagonal field angle of 23.28 °. The effective focal length EFL is 12.000, the total optical length TTL is 11.998, the EFL/TTL is 1.000, the optical lens has long focal length and ultra-thin, the on-axis and off-axis chromatic aberration is fully corrected, and the optical lens has excellent optical characteristics.

(third embodiment)

The third embodiment is basically the same as the first embodiment, the same reference numerals as in the first embodiment, and only different points will be described 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 inflection points and the stagnation point design data of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.

[ TABLE 11 ]

	Number of points of inflection	Position of reverse curvature 1	Position of reverse curvature 2
				P1R1	0
P1R2	1	1.395
				P2R1	1	0.335
P2R2	2	1.075	1.385
				P3R1	0
P3R2	2	0.645	1.405
				P4R1	2	1.235	1.425
P4R2	0
				P5R1	1	0.275
P5R2	0
				P6R1	1	1.385
P6R2	1	0.805

[ TABLE 12 ]

	Number of stagnation points	Location of stagnation 1
			P1R1	0
P1R2	0
			P2R1	1	0.575
P2R2	0
			P3R1	0
P3R2	1	0.895
			P4R1	0
P4R2	0
			P5R1	1	0.505
P5R2	0
			P6R1	0
P6R2	1	1.485

Fig. 10 and 11 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 486nm, 588nm, and 656nm passing through the imaging optical lens 30 according to the third embodiment. Fig. 12 is a schematic view showing curvature of field and distortion of light having a wavelength of 588nm after passing through the imaging optical lens 30 according to the third embodiment.

As shown in table 17, the third embodiment satisfies each conditional expression.

In the present embodiment, the imaging optical lens has an entrance pupil diameter of 3.590mm, a full field image height of 2.502mm, and a diagonal field angle of 22.92 °. The effective focal length EFL is 12.207, the total optical length TTL is 11.864, the EFL/TTL is 1.029, the optical lens is long in focal length and ultra-thin, the on-axis and off-axis chromatic aberration is fully corrected, and the optical lens has excellent optical characteristics.

(fourth embodiment)

The fourth embodiment is basically the same as the first embodiment, and the same reference numerals as in the first embodiment, and only different points will be described 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 inflection points and the stagnation point design data of each lens in the imaging optical lens 40 according to the fourth embodiment of the present invention.

[ TABLE 15 ]

	Number of points of inflection	Position of reverse curvature 1	Position of reverse curvature 2	Position of reverse curvature 3
					P1R1	1	1.625
P1R2	1	0.645
					P2R1	2	0.215	1.505
P2R2	2	0.895	1.525
					P3R1	0
P3R2	1	1.325
					P4R1	0
P4R2	2	0.315	0.505
					P5R1	1	0.365
P5R2	1	0.965
					P6R1	3	1.065	1.105	1.445
P6R2	3	0.985	1.085	1.425

[ TABLE 16 ]

	Number of stagnation points	Location of stagnation 1
			P1R1	0	0
P1R2	1	1.075
			P2R1	1	0.355
P2R2	0	0
			P3R1	0	0
P3R2	0	0
			P4R1	0	0
P4R2	0	0
			P5R1	1	0.845
P5R2	0	0
			P6R1	0	0
P6R2	0	0

Fig. 14 and 15 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 486nm, 588nm and 656nm passing through the imaging optical lens 40 according to the fourth embodiment. Fig. 16 is a schematic view showing curvature of field and distortion of light having a wavelength of 588nm after passing through the imaging optical lens 40 according to the fourth embodiment.

Table 17 below shows the numerical values corresponding to the respective conditional expressions in the present embodiment in accordance with the conditional expressions. Obviously, the imaging optical system of the present embodiment satisfies the above conditional expressions.

In the present embodiment, the imaging optical lens has an entrance pupil diameter of 3.654mm, a full field image height of 2.502mm, and a diagonal field angle of 22.50 °. The effective focal length EFL is 12.425, the total optical length TTL is 12.424, the EFL/TTL is 1.000, the optical lens has long focal length, ultra-thin thickness, and fully corrects the on-axis and off-axis chromatic aberration, and has excellent optical characteristics.

[ TABLE 17 ]

Parameter and condition formula	Example 1	Example 2	Example 3	Example 4
					v3/v2	3.74	4.21	2.83	2.83
(R11+R12)/(R11-R12)	-2.94	-1.70	-2.39	-18.99
					f	14.456	12.000	12.207	12.425
f1	9.590	7.207	11.594	13.255
					f2	-4.748	-4.240	-3.313	-4.769
f3	6.418	6.974	3.676	5.672
					f4	12.639	10.594	21.835	19.766
f5	-4.603	-4.815	-4.456	-9.413
					f6	8.385	9.480	5.127	9.940
f12	-36.599	-186.423	-9.392	-11.691
					Fno	3.40	3.40	3.40	3.40

Wherein, Fno: the F number of the diaphragm.

It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific embodiments for practicing the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.

Claims

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

2.80≤v3/v2≤4.30；

-20.00≤(R11+R12)/(R11-R12)≤-1.50。

2. the imaging optical lens of claim 1, wherein the radius of curvature of the object-side surface of the second lens is R3, the radius of curvature of the image-side surface of the second lens is R4, and the following relationship is satisfied:

3.00≤R3/R4≤20.00。

3. the imaging optical lens according to claim 1, wherein a focal length of the imaging optical lens is f, a focal length of the sixth lens is f6, and the following relationship is satisfied:

0.40≤f6/f≤0.80。

4. the imaging optical lens of claim 1, wherein the focal length of the 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 first lens is R1, the radius of curvature of the image-side surface of the first lens is R2, the on-axis thickness of the first lens is d1, the total optical length of the imaging optical lens is TTL, and the following relationships are satisfied:

0.30≤f1/f≤1.60；

-10.78≤(R1+R2)/(R1-R2)≤-0.55；

0.05≤d1/TTL≤0.31。

5. the imaging optical lens of claim 1, wherein the focal length of the imaging optical lens is f, the focal length of the second lens is f2, the radius of curvature of the object-side surface of the second lens is R3, the radius of curvature of the image-side surface of the second lens is R4, the on-axis thickness of the second lens is d3, the total optical length of the imaging optical lens is TTL, and the following relationships are satisfied:

-0.77≤f2/f≤-0.18；

0.55≤(R3+R4)/(R3-R4)≤2.76；

0≤d3/TTL≤0.04。

6. the imaging optical lens of claim 1, wherein the focal length of the imaging optical lens is f, 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 on-axis thickness of the third lens is d5, the total optical length of the imaging optical lens is TTL, and the following relationships are satisfied:

0.15≤f3/f≤0.87；

-4.62≤(R5+R6)/(R5-R6)≤0.21；

0.03≤d5/TTL≤0.09。

7. the imaging optical lens of claim 1, wherein the focal length of the imaging optical lens is f, 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 on-axis thickness of the fourth lens is d7, the total optical length of the imaging optical lens is TTL, and the following relationships are satisfied:

0.44≤f4/f≤2.68；

-7.88≤(R7+R8)/(R7-R8)≤0.78；

0.01≤d7/TTL≤0.08。

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

-1.52≤f5/f≤-0.21；

0.31≤(R9+R10)/(R9-R10)≤4.63；

0.01≤d9/TTL≤0.03。

9. an image-pickup optical lens according to claim 1, wherein a focal length of the image-pickup optical lens is f, and a combined focal length of the first lens and the second lens is f12, and the following relationship is satisfied:

-31.07≤f12/f≤-0.51。

10. the imaging optical lens of claim 1, wherein the first lens element is made of plastic, the second lens element is made of plastic, the third lens element is made of glass, the fourth lens element is made of plastic, the fifth lens element is made of plastic, and the sixth lens element is made of plastic.