CN111007649A

CN111007649A - Camera optics

Info

Publication number: CN111007649A
Application number: CN201911376876.5A
Authority: CN
Inventors: 寺岡弘之; 张磊; 崔元善
Original assignee: Ruisheng Communication Technology Changzhou Co Ltd
Current assignee: Ruisheng Communication Technology Changzhou Co Ltd
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2020-04-14
Anticipated expiration: 2039-12-27
Also published as: CN111007649B

Abstract

The invention relates to the field of optical lenses, and discloses an imaging optical lens. The imaging optical lens sequentially includes from the object side to the image side: a first lens with negative refractive power, a second lens with positive refractive power, and a positive refractive power. A third lens having a negative refractive power, a fourth lens having a negative refractive power, a fifth lens having a positive refractive power, and a sixth lens having a negative refractive power; and the following relationship is satisfied: 100.00°≤FOV≤135.00°;‑5.00 ≤f6/f≤‑2.00;‑30.00≤R1/R2≤‑10.00; 1.00≤d2/d8≤10.00. The imaging optical lens can obtain low TTL while obtaining high imaging 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 conditions that the pixel area of the photosensitive device is continuously reduced and the requirements of the system on the imaging quality are continuously improved, five-piece and six-piece lens structures gradually appear in the design of the lens. A wide-angle imaging lens having excellent optical characteristics, being ultra-thin and having sufficient chromatic aberration correction is in demand.

Disclosure of Invention

In view of the above problems, an object of the present invention is to provide an imaging optical lens that can satisfy the requirements of ultra-thinning and wide angle while achieving high imaging performance.

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 negative refractive power, a second lens element with positive refractive power, a third lens element with positive refractive power, a fourth lens element with negative refractive power, a fifth lens element with positive refractive power, and a sixth lens element with negative refractive power;

the imaging optical lens has a maximum field angle FOV, a focal length f6, a radius of curvature R1 of the object-side surface of the first lens, a radius of curvature R2 of the image-side surface of the first lens, an on-axis distance d2 from the image-side surface of the first lens to the object-side surface of the second lens, and an on-axis distance d8 from the image-side surface of the fourth lens to the object-side surface of the fifth lens, and satisfies the following relationships:

100.00°≤FOV≤135.00°；

-5.00≤f6/f≤-2.00；

-30.00≤R1/R2≤-10.00；

1.00≤d2/d8≤10.00。

preferably, the object-side surface of the first lens element is concave at the paraxial region, the image-side surface of the first lens element is concave at the paraxial region, the focal length of the first lens element is f1, and the on-axis thickness of the first lens element is d1, the total optical length of the imaging optical lens assembly is TTL, and the following relationships are satisfied:

-4.09≤f1/f≤-1.06；

0.41≤(R1+R2)/(R1-R2)≤1.40；

0.02≤d1/TTL≤0.16。

preferably, the imaging optical lens satisfies the following relational expression:

-2.56≤f1/f≤-1.32；

0.66≤(R1+R2)/(R1-R2)≤1.12；

0.03≤d1/TTL≤0.13。

preferably, the object-side surface of the second lens element is concave at the paraxial region, the image-side surface of the second lens element is convex at the paraxial region, the focal length of the second lens element is f2, 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 image pickup optical lens assembly is TTL and satisfies the following relationship:

2.15≤f2/f≤10.78；

0.84≤(R3+R4)/(R3-R4)≤9.18；

0.05≤d3/TTL≤0.23。

3.44≤f2/f≤8.62；

1.34≤(R3+R4)/(R3-R4)≤7.35；

0.07≤d3/TTL≤0.19。

preferably, an object-side surface of the third lens element is convex at a paraxial region, an image-side surface of the third lens element is convex at a paraxial region, a focal length of the third lens element is f3, a curvature radius of the object-side surface of the third lens element is R5, a curvature radius of the image-side surface of the third lens element is R6, an axial thickness of the third lens element is d5, and a total optical length of the image pickup optical lens assembly is TTL and satisfies the following relationships:

0.36≤f3/f≤1.86；

-0.18≤(R5+R6)/(R5-R6)≤0.30；

0.05≤d5/TTL≤0.21。

0.57≤f3/f≤1.49；

-0.11≤(R5+R6)/(R5-R6)≤0.24；

0.08≤d5/TTL≤0.17。

preferably, an object-side surface of the fourth lens element is concave at a paraxial region, a focal length of the fourth lens element is f4, a radius of curvature of the object-side surface of the fourth lens element is R7, a radius of curvature of an image-side surface of the fourth lens element is R8, an on-axis thickness of the fourth lens element is d7, a total optical length of the imaging optical lens system is TTL, and the following relationships are satisfied:

-5.20≤f4/f≤-0.91；

-2.60≤(R7+R8)/(R7-R8)≤-0.44；

0.02≤d7/TTL≤0.05。

-3.25≤f4/f≤-1.14；

-1.63≤(R7+R8)/(R7-R8)≤-0.55；

0.03≤d7/TTL≤0.04。

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 assembly is TTL, and the following relationships are satisfied:

0.94≤f5/f≤26.91；

-21.63≤(R9+R10)/(R9-R10)≤2.58；

0.02≤d9/TTL≤0.15。

1.51≤f5/f≤21.53；

-13.52≤(R9+R10)/(R9-R10)≤2.06；

0.04≤d9/TTL≤0.12。

preferably, an object-side surface of the sixth lens element is convex at a paraxial region, an image-side surface of the sixth lens element is concave at a paraxial region, a radius of curvature of the object-side surface of the sixth lens element is R11, a radius of curvature of the image-side surface of the sixth lens element is R12, an on-axis thickness of the sixth lens element is d11, and the imaging optical lens system has a total optical length TTL satisfying the following relationship:

1.35≤(R11+R12)/(R11-R12)≤7.60；

0.02≤d11/TTL≤0.17。

2.16≤(R11+R12)/(R11-R12)≤6.08；

0.03≤d11/TTL≤0.14。

preferably, the total optical length TTL of the image pickup optical lens is less than or equal to 7.62 mm.

Preferably, the total optical length TTL of the image pickup optical lens is less than or equal to 7.28 millimeters.

Preferably, the F-number of the imaging optical lens is less than or equal to 3.30.

Preferably, the F-number of the imaging optical lens is less than or equal to 3.23.

The invention has the beneficial effects that: the imaging optical lens according to the present invention has excellent optical characteristics, is extremely thin, has a wide angle, and sufficiently corrects chromatic aberration, and is particularly suitable for a mobile phone imaging lens unit and a WEB imaging lens which are configured by an imaging element such as a CCD or a 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 shown in fig. 9.

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 first lens L1, a second lens L2, a stop S1, 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 on the image side of the sixth lens element L6.

The first lens L1 is made of plastic, the second lens L2 is made of plastic, the third lens L3 is made of plastic, the fourth lens L4 is made of plastic, the fifth lens L5 is made of plastic, and the sixth lens L6 is made of plastic.

The maximum field angle of the camera optical lens 10 is defined as FOV, the FOV is greater than or equal to 100.00 degrees and less than or equal to 135.00 degrees, ultra-wide-angle camera shooting can be realized within the range, and user experience is improved.

The focal length of the whole shooting optical lens is defined as f, the focal length of the sixth lens L6 is defined as f6, -5.00 ≤ f6/f ≤ 2.00, and the system has better imaging quality and lower sensitivity through reasonable distribution of focal power. 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, R1/R2 is defined as-30.00 and not more than-10.00, and the shape of the first lens L1 is defined, so that the problem of chromatic aberration on the axis can be favorably corrected as the lens is changed to an ultra-thin wide angle within the range.

The axial distance between the image side surface of the first lens L1 and the object side surface of the second lens L2 is defined as d2, the axial distance between the image side surface of the fourth lens L4 and the object side surface of the fifth lens L5 is defined as d8, d2/d8 is defined as being greater than or equal to 1.00 and less than or equal to 10.00, and the ratio of the axial distance between the first lens L1 and the second lens L2 to the axial distance between the fourth lens L4 and the fifth lens L5 is defined, so that the wide-angle lens can be favorably developed when the ratio is within the range.

When the focal length of the image pickup optical lens 10, the focal lengths of the respective lenses, the refractive indices of the respective lenses, the optical total length of the image pickup optical lens, the on-axis thickness, and the curvature radius satisfy the above-described relational expressions, the image pickup optical lens 10 can have high performance and meet the design requirement of low TTL.

In this embodiment, the object-side surface and the image-side surface of the first lens element L1 are concave at the paraxial region and have negative refractive power.

The focal length of the whole shooting optical lens is f, the focal length of the first lens L1 is f1, -4.09 is less than or equal to f1/f is less than or equal to-1.06, and the ratio of the focal length of the first lens L1 to the whole focal length is specified. Within the predetermined range, the first lens element L1 has a suitable negative refractive power, which is beneficial to reducing system aberration and is beneficial to the development of ultra-thin and wide-angle lenses. Preferably, -2.56. ltoreq. f 1/f. ltoreq-1.32.

The curvature radius R1 of the object side surface of the first lens L1 and the curvature radius R2 of the image side surface of the first lens L1 satisfy the following relations: 0.41-1.40 of (R1+ R2)/(R1-R2), and reasonably controlling the shape of the first lens L1 to enable the first lens L1 to effectively correct the system spherical aberration; preferably, 0.66 ≦ (R1+ R2)/(R1-R2). ltoreq.1.12.

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 0.02 and less than or equal to 0.16, and ultra-thinning is facilitated. Preferably, 0.03. ltoreq. d 1/TTL. ltoreq.0.13.

In this embodiment, the object-side surface of the second lens element L2 is concave at the paraxial region thereof, and the image-side surface thereof is convex at the paraxial region thereof, and has positive refractive power.

The focal length of the entire image pickup optical lens 10 is f, and the focal length of the second lens L2 is f2, and the following relations are satisfied: f2/f is more than or equal to 2.15 and less than or equal to 10.78, 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, 3.44. ltoreq. f 2/f. ltoreq.8.62.

The curvature radius R3 of the object side surface of the second lens L2 and the curvature radius R4 of the image side surface of the second lens L2 satisfy the following relations: the second lens L2 is defined in a shape of (R3+ R4)/(R3-R4) of 0.84. ltoreq. R9.18, and when the second lens L2 is within the range, the second lens L2 is advantageous for correcting the problem of chromatic aberration on the axis as the lens is made to have a super-thin wide angle. Preferably, 1.34 ≦ (R3+ R4)/(R3-R4). ltoreq.7.35.

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 0.05 and less than or equal to 0.23, and ultra-thinning is facilitated. Preferably, 0.07. ltoreq. d 3/TTL. ltoreq.0.19.

In this embodiment, the object-side surface of the third lens element L3 is convex at the paraxial region thereof, and the image-side surface thereof is convex at the paraxial region thereof, and has positive refractive power.

The focal length f of the entire image pickup optical lens 10 and the focal length f3 of the third lens L3 satisfy the following relationships: f3/f is more than or equal to 0.35 and less than or equal to 1.86, and the system has better imaging quality and lower sensitivity through reasonable distribution of the focal power. Preferably, 0.57. ltoreq. f 3/f. ltoreq.1.49.

The curvature radius R5 of the object side surface of the third lens L3 and the curvature radius R6 of the image side surface of the third lens L3 satisfy the following relations: the ratio of (R5+ R6)/(R5-R6) is 0.18-0.30, the shape of the third lens L3 can be effectively controlled, the forming of the third lens L3 is facilitated, the deflection degree of light rays passing through the lens can be alleviated within the range specified by the conditional expression, and the aberration can be effectively reduced. Preferably, -0.11 ≦ (R5+ R6)/(R5-R6) ≦ 0.24.

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 0.05 and less than or equal to 0.21, and ultra-thinning is facilitated. Preferably, 0.08. ltoreq. d 5/TTL. ltoreq.0.17.

In this embodiment, the object-side surface of the fourth lens element L4 is concave at the paraxial region and has negative refractive power.

The focal length of the image pickup optical lens is f, the focal length of the fourth lens is f4, and the following relation is satisfied: -5.20. ltoreq. f 4/f. ltoreq. -0.91, the system having better imaging quality and lower sensitivity by a reasonable distribution of the optical power, preferably-3.25. ltoreq. f 4/f. ltoreq. -1.14.

The curvature radius R7 of the object side surface of the fourth lens L4 and the curvature radius R8 of the image side surface of the fourth lens L4 satisfy the following relations: -2.60 ≦ (R7+ R8)/(R7-R8) ≦ -0.44, and the shape of the fourth lens L4 is defined so that the problem of aberration of the off-axis angle is easily corrected with the development of an ultra-thin and wide-angle when the shape is within the range. Preferably, -1.63 ≦ (R7+ R8)/(R7-R8) ≦ -0.55.

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 0.02 and less than or equal to 0.05, and ultra-thinning is facilitated. Preferably, 0.03. ltoreq. d 7/TTL. ltoreq.0.04.

In this embodiment, the fifth lens element L5 has positive refractive power.

The focal length of the imaging optical lens is f, the focal length of the fifth lens L5 is f5, and the following relations are satisfied: f5/f is more than or equal to 0.94 and less than or equal to 26.91, and the definition of the fifth lens L5 can effectively make the light ray angle of the camera lens smooth and reduce the tolerance sensitivity. Preferably, 1.51. ltoreq. f 5/f. ltoreq.21.53.

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: -21.63 ≦ (R9+ R10)/(R9-R10) ≦ 2.58, and the shape of the fifth lens L5 is specified, and when the conditions are within the range, it is advantageous to correct the aberration of the off-axis view angle and the like as the ultra-thin wide angle is developed. Preferably, -13.52 ≦ (R9+ R10)/(R9-R10). ltoreq.2.06.

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 0.15, and ultra-thinning is facilitated. Preferably, 0.04. ltoreq. d 9/TTL. ltoreq.0.12.

In this embodiment, the object-side surface of the sixth lens element L6 is convex at the paraxial region thereof, and the image-side surface thereof is concave at the paraxial region thereof, and has negative refractive power.

The curvature radius R11 of the object side surface of the sixth lens L6 and the curvature radius R12 of the image side surface of the sixth lens L6 satisfy the following relations: 1.35 (R11+ R12)/(R11-R12) is 7.60 or less, and the shape of the sixth lens L6 is defined, and when the shape is within the condition range, the problem of aberration of off-axis picture angle is favorably corrected along with the development of ultra-thin wide-angle. Preferably, 2.16 ≦ (R11+ R12)/(R11-R12). ltoreq.6.08.

The on-axis thickness of the sixth lens L6 is d11, the total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: d11/TTL is more than or equal to 0.02 and less than or equal to 0.17, and ultra-thinning is facilitated. Preferably, 0.03. ltoreq. d 11/TTL. ltoreq.0.14.

In this embodiment, the total optical length TTL of the image pickup optical lens 10 is less than or equal to 7.62 mm, which is beneficial to achieving ultra-thinning. Preferably, the total optical length TTL of the image-taking optical lens 10 is less than or equal to 7.28 millimeters.

In the present embodiment, the number of apertures F of the imaging optical lens 10 is 3.30 or less. The large aperture is large, and the imaging performance is good. Preferably, the F-number of the imaging optical lens 10 is 3.23 or less.

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: the total optical length (on-axis distance from the object side surface of the first lens L1 to the image plane) in units of 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 axial distance from the image side surface of the optical filter GF to the image surface Si;

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 and A16 are aspheric coefficients.

IH: image height

y＝(x²/R)/[1+{1-(k+1)(x²/R²)}^1/2]+A4x⁴+A6x⁶+A8x⁸+A10x¹⁰+A12x¹²+A14x¹⁴+A16x¹⁶(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	1	0.695
P1R2	1	0.885
					P2R1	0
P2R2	1	0.635
					P3R1	0
P3R2	0
					P4R1	0
P4R2	2	0.075	0.615
					P5R1	1	0.625
P5R2	1	0.925
					P6R1	3	0.425	1.155	1.465
P6R2	1	0.575

[ TABLE 4 ]

	Number of stagnation points	Location of stagnation 1	Location of stagnation 2
				P1R1	1	1.105
P1R2	0
				P2R1	0
P2R2	0
				P3R1	0
P3R2	0
				P4R1	0
P4R2	1	0.125
				P5R1	1	0.885
P5R2	0
				P6R1	2	0.915	1.405
P6R2	1	1.345

Fig. 2 and 3 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 656nm, 588nm, and 486nm, respectively, after 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 13 shown later shows values corresponding to the parameters defined in the conditional expressions for the respective numerical values in examples 1, 2, and 3.

As shown in table 13, the first embodiment satisfies each conditional expression.

In the present embodiment, the imaging optical lens has an entrance pupil diameter of 0.843mm, a full field image height of 2.62mm, a maximum field angle of 101.00 °, a wide angle, and a high profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.

(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 ]

[ TABLE 8 ]

	Number of stagnation points	Location of stagnation 1	Location of stagnation 2
				P1R1	1	0.615
P1R2	0
				P2R1	0
P2R2	0
				P3R1	0
P3R2	0
				P4R1	0
P4R2	2	0.335	0.805
				P5R1	1	0.925
P5R2	2	0.445	1.125
				P6R1	1	0.815
P6R2	1	1.485

Fig. 6 and 7 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 656nm, 588nm, and 486nm, respectively, after 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 13, the second embodiment satisfies each conditional expression.

In the present embodiment, the imaging optical lens has an entrance pupil diameter of 0.731mm, a full field image height of 2.62mm, a maximum field angle of 116.01 °, a wide angle, and a high profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.

(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 ]

[ TABLE 12 ]

	Number of stagnation points	Location of stagnation 1	Location of stagnation 2
				P1R1	1	0.625
P1R2	0
				P2R1	0
P2R2	0
				P3R1	0
P3R2	0
				P4R1	0
P4R2	0
				P5R1	2	0.795	1.035
P5R2	0
				P6R1	1	0.485
P6R2	1	0.995

Fig. 10 and 11 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 656nm, 588nm, and 486nm 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.

Table 13 below shows the numerical values corresponding to the respective conditional expressions in the present embodiment, in accordance with the conditional expressions described above. 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 0.487mm, a full field image height of 2.62mm, a maximum field angle of 134.80 °, a wide angle, and a high profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.

[ TABLE 13 ]

F12 is the combined focal length of the first lens L1 and the second lens L2, and FNO is the number of apertures F of the imaging optical lens.

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, characterized in that, the imaging optical lens comprises in sequence from the object side to the image side: a first lens with a negative refractive power, a second lens with a positive refractive power, and a positive refractive power the third lens, the fourth lens with negative refractive power, the fifth lens with positive refractive power, and the sixth lens with negative refractive power;

The maximum field angle of the imaging optical lens is FOV, the focal length of the imaging optical lens is f, the focal length of the sixth lens is f6, the curvature radius of the object side of the first lens is R1, and the first lens The radius of curvature of the image side of the lens is R2, the on-axis distance from the image side of the first lens to the object side of the second lens is d2, and the image side of the fourth lens to the object side of the fifth lens The on-axis distance is d8, which satisfies the following relation:

100.00°≤FOV≤135.00°;

-5.00≤f6/f≤-2.00;

-30.00≤R1/R2≤-10.00;

1.00≤d2/d8≤10.00.

2 . The imaging optical lens according to claim 1 , wherein the object side of the first lens is concave at the paraxial position, the image side is concave at the paraxial position, and the focal length of the first lens is f1 . , and the on-axis thickness of the first lens is d1, the optical total length of the imaging optical lens is TTL, and the following relationship is satisfied:

-4.09≤f1/f≤-1.06;

0.41≤(R1+R2)/(R1-R2)≤1.40;

0.02≤d1/TTL≤0.16.

3. The imaging optical lens according to claim 2, wherein the imaging optical lens satisfies the following relational expression:

-2.56≤f1/f≤-1.32;

0.66≤(R1+R2)/(R1-R2)≤1.12;

0.03≤d1/TTL≤0.13.

4. The imaging optical lens according to claim 1, wherein the object side of the second lens is concave at the paraxial position, the image side is convex at the paraxial position, and the focal length of the second lens is f2 , the radius of curvature of the object side of the second lens is R3, the radius of curvature of the image side of the second lens is R4, the on-axis thickness of the second lens is d3, and the total optical length of the imaging optical lens is TTL, and satisfy the following relation:

2.15≤f2/f≤10.78;

0.84≤(R3+R4)/(R3-R4)≤9.18;

0.05≤d3/TTL≤0.23.

5. The imaging optical lens according to claim 4, wherein the imaging optical lens satisfies the following relation:

3.44≤f2/f≤8.62;

1.34≤(R3+R4)/(R3-R4)≤7.35;

0.07≤d3/TTL≤0.19.

6. The imaging optical lens according to claim 1, wherein the object side of the third lens is convex at the paraxial position, the image side is convex at the paraxial position, and the focal length of the third lens is f3 , the radius of curvature of the object side of the third lens is R5, the radius of curvature of the image side of the third lens is R6, the on-axis thickness of the third lens is d5, and the total optical length of the imaging optical lens is TTL, and satisfy the following relation:

0.35≤f3/f≤1.86;

-0.18≤(R5+R6)/(R5-R6)≤0.30;

0.05≤d5/TTL≤0.21.

7. The imaging optical lens according to claim 6, wherein the imaging optical lens satisfies the following relation:

0.57≤f3/f≤1.49;

-0.11≤(R5+R6)/(R5-R6)≤0.24;

0.08≤d5/TTL≤0.17.

8 . The imaging optical lens according to claim 1 , wherein the object side of the fourth lens is concave at the paraxial position, the focal length of the fourth lens is f4 , and the object side of the fourth lens is f4 . The radius of curvature is R7, the radius of curvature of the image side surface of the fourth lens is R8, the axial thickness of the fourth lens is d7, the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied:

-5.20≤f4/f≤-0.91;

-2.60≤(R7+R8)/(R7-R8)≤-0.44;

0.02≤d7/TTL≤0.05.

9. The imaging optical lens according to claim 8, wherein the imaging optical lens satisfies the following relation:

-3.25≤f4/f≤-1.14;

-1.63≤(R7+R8)/(R7-R8)≤-0.55;

0.03≤d7/TTL≤0.04.

10 . The imaging optical lens according to claim 1 , wherein the focal length of the fifth lens is f5, the radius of curvature of the object side of the fifth lens is R9, and the radius of curvature of the image side of the fifth lens is R9. 11 . 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 relationship is satisfied:

0.94≤f5/f≤26.91;

-21.63≤(R9+R10)/(R9-R10)≤2.58;

0.02≤d9/TTL≤0.15.

11. The imaging optical lens according to claim 10, wherein the imaging optical lens satisfies the following relation:

1.51≤f5/f≤21.53;

-13.52≤(R9+R10)/(R9-R10)≤2.06;

0.04≤d9/TTL≤0.12.

12 . The imaging optical lens according to claim 1 , wherein the object side of the sixth lens is convex at the paraxial position, the image side is concave at the paraxial position, and the curvature of the object side of the sixth lens is concave. 13 . The radius is R11, the curvature radius of the image side surface of the sixth lens is R12, the axial thickness of the sixth lens is d11, the optical total length of the imaging optical lens is TTL, and the following relationship is satisfied:

1.35≤(R11+R12)/(R11-R12)≤7.60;

0.02≤d11/TTL≤0.17.

13. The imaging optical lens according to claim 12, wherein the imaging optical lens satisfies the following relationship:

2.16≤(R11+R12)/(R11-R12)≤6.08;

0.03≤d11/TTL≤0.14.

14 . The imaging optical lens according to claim 1 , wherein the total optical length TTL of the imaging optical lens is less than or equal to 7.62 mm. 15 .

15 . The imaging optical lens according to claim 14 , wherein the total optical length TTL of the imaging optical lens is less than or equal to 7.28 mm. 16 .

16 . The imaging optical lens according to claim 1 , wherein the F-number of the aperture of the imaging optical lens is less than or equal to 3.30. 17 .

17 . The imaging optical lens according to claim 16 , wherein the F-number of the aperture of the imaging optical lens is less than or equal to 3.23. 18 .