CN110908087B

CN110908087B - Image pickup optical lens

Info

Publication number: CN110908087B
Application number: CN201911374827.8A
Authority: CN
Inventors: 寺西孝亮; 张磊; 崔元善
Original assignee: Chengrui Optics Changzhou Co Ltd
Current assignee: Chengrui Optics Changzhou Co Ltd
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2021-07-30
Anticipated expiration: 2039-12-27
Also published as: CN110908087A

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 negative refractive power, a second lens element with positive 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 imaging optical lens has a maximum field angle FOV, a curvature radius of an object-side surface of the sixth lens element is R11, a curvature radius of an image-side surface of the sixth lens element is R12, an on-axis distance from the image-side surface of the first lens element to the object-side surface of the second lens element is d2, and an on-axis distance from the image-side surface of the second lens element to the object-side surface of the third lens element is d4, and the following relationships are satisfied: FOV is more than or equal to 100.00 degrees and less than or equal to 135.00 degrees; R11/R12 is more than or equal to 2.00 and less than or equal to 20.00; d2/d4 is more than or equal to 0.30 and less than or equal to 1.00. The imaging optical lens can obtain high imaging performance and low TTL.

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 positive refractive power, a fifth lens element with negative refractive power, and a sixth lens element with positive refractive power; the imaging optical lens has a maximum field angle FOV, a curvature radius of an object-side surface of the sixth lens element is R11, a curvature radius of an image-side surface of the sixth lens element is R12, an on-axis distance from the image-side surface of the first lens element to the object-side surface of the second lens element is d2, and an on-axis distance from the image-side surface of the second lens element to the object-side surface of the third lens element is d4, and the following relationships are satisfied: FOV is more than or equal to 100.00 degrees and less than or equal to 135.00 degrees; R11/R12 is more than or equal to 2.00 and less than or equal to 20.00; d2/d4 is more than or equal to 0.30 and less than or equal to 1.00.

Preferably, the object-side surface of the first lens element is convex in the paraxial region, and the image-side surface thereof is concave in the paraxial region; the focal length of the image pickup optical lens is f, the focal length of the first lens is f1, the curvature radius of the object side surface of the first lens is R1, the curvature radius 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 image pickup optical lens is TTL, and the following relational expression is satisfied: f1/f is not less than 3.66 and not more than-0.90; (R1+ R2)/(R1-R2) is not more than 0.97 and not more than 7.16; d1/TTL is more than or equal to 0.03 and less than or equal to 0.11.

Preferably, the imaging optical lens satisfies the following relational expression: f1/f is not less than-1.13 and is not less than-2.29; (R1+ R2)/(R1-R2) is not more than 1.55 and not more than 5.72; d1/TTL is more than or equal to 0.04 and less than or equal to 0.09.

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, and 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: f2/f is more than or equal to 0.50 and less than or equal to 10.19; -25.56 (R3+ R4)/(R3-R4) 2.12 or less; d3/TTL is more than or equal to 0.03 and less than or equal to 0.13.

Preferably, the imaging optical lens satisfies the following relational expression: f2/f is more than or equal to 0.80 and less than or equal to 8.15; 15.98-1.70 of (R3+ R4)/(R3-R4); d3/TTL is more than or equal to 0.05 and less than or equal to 0.10.

Preferably, the image-side surface of the third lens is convex at the paraxial region; the focal length of the image pickup optical lens is f, the focal length of the third lens is f3, 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 third lens is d5, the total optical length of the image pickup optical lens is TTL, and the following relational expression is satisfied: f3/f is more than or equal to 0.75 and less than or equal to 2.55; -0.33 ≤ (R5+ R6)/(R5-R6) 1.68; d5/TTL is more than or equal to 0.03 and less than or equal to 0.18.

Preferably, the imaging optical lens satisfies the following relational expression: f3/f is more than or equal to 1.20 and less than or equal to 2.04; -0.21 ≤ (R5+ R6)/(R5-R6) 1.34; d5/TTL is more than or equal to 0.04 and less than or equal to 0.15.

Preferably, the object-side surface of the fourth lens element is concave in the paraxial region, and the image-side surface thereof is convex in the paraxial region; the focal length of the image pickup optical lens is f, the focal length of the fourth lens is f4, the curvature radius of the object side surface of the fourth lens is R7, the curvature radius 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 image pickup optical lens is TTL, and the following relational expression is satisfied: f4/f is more than or equal to 0.48 and less than or equal to 2.88; 1.08 is less than or equal to (R7+ R8)/(R7-R8) is less than or equal to 3.46; d7/TTL is more than or equal to 0.04 and less than or equal to 0.13.

Preferably, the imaging optical lens satisfies the following relational expression: f4/f is more than or equal to 0.77 and less than or equal to 2.30; 1.73 is less than or equal to (R7+ R8)/(R7-R8) is less than or equal to 2.77; d7/TTL is more than or equal to 0.06 and less than or equal to 0.11.

Preferably, the object-side surface of the fifth lens element is convex in the paraxial region, and the image-side surface thereof is concave in the paraxial region; the focal length of the image pickup optical lens is f, 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, and the on-axis thickness of the fifth lens element is d9, the total optical length of the image pickup optical lens is TTL, and the following relations are satisfied: f5/f is not less than 4.07 and not more than-0.57; (R9+ R10)/(R9-R10) is not more than 0.65 and not more than 3.59; d9/TTL is more than or equal to 0.03 and less than or equal to 0.11.

Preferably, the imaging optical lens satisfies the following relational expression: f5/f is not less than 2.54 and not more than-0.71; 1.05 is less than or equal to (R9+ R10)/(R9-R10) is less than or equal to 2.87; d9/TTL is more than or equal to 0.05 and less than or equal to 0.09.

Preferably, the object-side surface of the sixth lens element is concave in the paraxial region, and the image-side surface thereof is convex in the paraxial region; the focal length of the image pickup optical lens is f, the focal length of the sixth lens is f6, the on-axis thickness of the sixth lens is d11, the total optical length of the image pickup optical lens is TTL, and the following relational expression is satisfied: f6/f is more than or equal to 2.09 and less than or equal to 536.44; (R11+ R12)/(R11-R12) is not more than 0.55 and not more than 4.25; d11/TTL is more than or equal to 0.03 and less than or equal to 0.13.

Preferably, the imaging optical lens satisfies the following relational expression: f6/f is not less than 3.34 and not more than 429.16; (R11+ R12)/(R11-R12) is not more than 0.89 and not more than 3.40; d11/TTL is more than or equal to 0.05 and less than or equal to 0.10.

Preferably, the total optical length TTL of the image pickup optical lens is less than or equal to 9.23 millimeters.

Preferably, the total optical length TTL of the image pickup optical lens is less than or equal to 8.81 mm.

Preferably, the F-number of the imaging optical lens is less than or equal to 2.94.

Preferably, the F-number of the imaging optical lens is less than or equal to 2.88.

The invention has the advantages that the optical camera lens has excellent optical characteristics, is ultrathin, has wide angle and can fully correct chromatic aberration, and is particularly suitable for mobile phone camera lens components and WEB camera lenses which are composed of high-pixel CCD, CMOS and other camera elements.

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: the lens system includes a first lens element L1 with negative refractive power, a stop S1, a second lens element L2 with positive refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with negative refractive power, and a sixth lens element L6 with positive refractive power. 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 whole camera optical lens 10 is defined as FOV, FOV is not less than 100.00 degrees and not more than 135.00 degrees, the maximum field angle of the camera optical lens 10 is specified, ultra-wide-angle camera shooting can be realized within the range, and user experience is improved. Preferably, the FOV is 100.36 DEG.ltoreq. 133.99 deg.

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, R11/R12 is defined as not more than 2.00 and not more than 20.00, and the shape of the sixth lens L6 is defined, so that the problem of aberration and the like of an off-axis picture angle can be favorably corrected along with the development of an ultra-thin wide angle within a condition range. Preferably, 2.05. ltoreq. R11/R12. ltoreq.19.76 is satisfied.

An 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, an axial distance between the image side surface of the second lens L2 and the object side surface of the third lens L3 is defined as d4, d2/d4 is defined as 0.30-1.00, and a ratio of the axial distance between the image side surface of the first lens L1 and the object side surface of the second lens L2 to the axial distance between the image side surface of the second lens L2 and the object side surface of the third lens L3 is defined, so that the lens can be widened in the range. Preferably, it satisfies 0.34. ltoreq. d2/d 4. ltoreq.0.98.

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 of the first lens element L1 is convex in the paraxial region, and the image-side surface thereof is concave in the paraxial region.

Defining the focal length f of the image pickup optical lens 10 and the focal length f1 of the first lens L1, the following relations are satisfied: -3.66. ltoreq. f 1/f. ltoreq. 0.90, specifying the ratio of the focal length of the first lens L1 to the overall focal length. 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, it satisfies-2.29. ltoreq. f 1/f. ltoreq-1.13.

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: 0.97 ≦ (R1+ R2)/(R1-R2) ≦ 7.16, and the shape of the first lens L1 is controlled reasonably so that the first lens L1 can effectively correct the system spherical aberration. Preferably, 1.55 ≦ (R1+ R2)/(R1-R2) ≦ 5.72.

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 relationships are satisfied: d1/TTL is more than or equal to 0.03 and less than or equal to 0.11, and ultra-thinning is facilitated. Preferably, 0.04. ltoreq. d 1/TTL. ltoreq.0.09.

The focal length f2 of the second lens L2 satisfies the following relation: f2/f is more than or equal to 0.50 and less than or equal to 10.19, 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, 0.80. ltoreq. f 2/f. ltoreq.8.15.

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 shape of the second lens L2 is defined to be (R3+ R4)/(R3-R4) to be (25.56) to (2.12), and the problem of chromatic aberration on the axis can be corrected favorably as the lens is brought to a super-thin wide angle in the range. Preferably, -15.98 ≦ (R3+ R4)/(R3-R4). ltoreq.1.70.

The on-axis thickness of the second lens L2 is d3, and satisfies the following relation: d3/TTL is more than or equal to 0.03 and less than or equal to 0.13, and ultra-thinning is facilitated. Preferably, 0.05. ltoreq. d 3/TTL. ltoreq.0.10.

In the present embodiment, the image-side surface of the third lens element L3 is convex in the paraxial region.

The focal length f3 of the third lens L3 satisfies the following relation: f3/f is more than or equal to 0.75 and less than or equal to 2.55, and the system has better imaging quality and lower sensitivity through reasonable distribution of the focal power. Preferably, 1.20. ltoreq. f 3/f. ltoreq.2.04.

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 (R5+ R6)/(R5-R6) is more than or equal to 0.33 and less than or equal to 1.68, the shape of the third lens L3 can be effectively controlled, the forming of the third lens L3 is facilitated, and the deflection degree of light rays passing through the lens can be alleviated within the range specified by the conditional expression, so that the aberration can be effectively reduced. Preferably, -0.21 ≦ (R5+ R6)/(R5-R6). ltoreq.1.34.

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 0.18, and ultra-thinning is facilitated. Preferably, 0.04. ltoreq. d 5/TTL. ltoreq.0.15.

In this embodiment, the object-side surface of the fourth lens element L4 is concave in the paraxial region thereof, and the image-side surface thereof is convex in the paraxial region thereof.

The focal length of the fourth lens L4 is f4, and the following relationship is satisfied: f4/f is more than or equal to 0.48 and less than or equal to 2.88, and the system has better imaging quality and lower sensitivity through reasonable distribution of the focal power. Preferably, 0.77. ltoreq. f 4/f. ltoreq.2.30.

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: 1.08 ≦ (R7+ R8)/(R7-R8) ≦ 3.46, and the shape of the fourth lens L4 is specified, and when the shape is within the range, problems such as aberration of the off-axis angle are easily corrected with the development of an ultra-thin wide angle. Preferably, 1.73 ≦ (R7+ R8)/(R7-R8). ltoreq.2.77.

The on-axis thickness of the fourth lens L4 is d7, and satisfies the following relation: d7/TTL is more than or equal to 0.04 and less than or equal to 0.13, and ultra-thinning is facilitated. Preferably, 0.06. ltoreq. d 7/TTL. ltoreq.0.11.

In the present embodiment, the object-side surface of the fifth lens element L5 is convex in the paraxial region, and the image-side surface thereof is concave in the paraxial region.

The focal length f5 of the fifth lens L5 satisfies the following relation: f5/f is more than or equal to 4.07 and less than or equal to-0.57, 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, -2.54. ltoreq. f 5/f. ltoreq-0.71.

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 (R9+ R10)/(R9-R10) is not more than 0.65 and not more than 3.59, and the shape of the fifth lens L5 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, 1.05 ≦ (R9+ R10)/(R9-R10). ltoreq.2.87.

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 0.11, and ultra-thinning is facilitated. Preferably, 0.05. ltoreq. d 9/TTL. ltoreq.0.09.

In the present embodiment, the object-side surface of the sixth lens element L6 is concave in the paraxial region thereof, and the image-side surface thereof is convex in the paraxial region thereof.

The focal length f6 of the sixth lens L6 satisfies the following relation: 2.09 ≦ f6/f ≦ 536.44, and the system has better imaging quality and lower sensitivity through reasonable distribution of the focal power. Preferably, 3.34. ltoreq. f 6/f. ltoreq. 429.16.

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: the (R11+ R12)/(R11-R12) is not more than 0.55 and not more than 4.25, 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, 0.89 ≦ (R11+ R12)/(R11-R12). ltoreq.3.40.

The on-axis thickness of the sixth lens L6 is d11, and satisfies the following relation: d11/TTL is more than or equal to 0.03 and less than or equal to 0.13, and ultra-thinning is facilitated. Preferably, 0.05. ltoreq. d 11/TTL. ltoreq.0.10.

In this embodiment, the total optical length TTL of the image pickup optical lens 10 is less than or equal to 9.23 mm, which is beneficial to achieving ultra-thinning. Preferably, the total optical length TTL of the image pickup optical lens 10 is less than or equal to 8.81 mm.

In the present embodiment, the number of apertures F of the imaging optical lens 10 is 2.94 or less. The large aperture is large, and the imaging performance is good. Preferably, the F-number of the imaging optical lens 10 is 2.88 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.

In this embodiment, the focal length of the image pickup optical lens 10 is f, the combined focal length of the first lens L1 and the second lens L2 is f12, and the following relationship is satisfied: f12/f is more than or equal to-3.32 and less than or equal to 4.86. Therefore, the aberration and distortion of the shooting optical lens can be eliminated, the back focal length of the shooting optical lens can be suppressed, and the miniaturization of the image lens system group is maintained. Preferably, -2.08. ltoreq. f 12/f. ltoreq.3.89.

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 the meanings of the symbols are as follows:

s1: an aperture;

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

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

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

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

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

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

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

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

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

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

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

r11: 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.

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	Position of reverse curve 4
						P1R1	1	0.955
P1R2	0
						P2R1	0
P2R2	0
						P3R1	1	1.195
P3R2	0
						P4R1	1	0.725
P4R2	1	0.845
						P5R1	2	0.655	1.905
P5R2	2	0.875	2.175
						P6R1	2	0.035	2.375
P6R2	4	0.195	0.975	1.775	2.445

[ TABLE 4 ]

	Number of stagnation points	Location of stagnation 1	Location of stagnation 2	Location of stagnation 3	Location of stagnation 4
						P1R1	0
P1R2	0
						P2R1	0
P2R2	0
						P3R1	1	1.635
P3R2	0
						P4R1	1	1.295
P4R2	1	1.655
						P5R1	1	1.165
P5R2	0
						P6R1	1	0.055
P6R2	4	0.335	1.295	2.015	2.615

Fig. 2 and 3 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 470nm, 555nm, and 650nm, 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 555nm 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 of various numerical values in examples 1, 2, and 3 corresponding to the parameters specified in the conditional expressions.

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 1.312mm, a full field image height of 3.25mm, a maximum field angle of 100.71 ° and is wide-angle and ultra-thin, and has excellent optical characteristics with its 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 ]

	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	0
P2R2	0
					P3R1	1	0.885
P3R2	0
					P4R1	2	0.755	1.735
P4R2	2	0.805	1.685
					P5R1	2	0.635	1.895
P5R2	3	0.825	1.885	2.165
					P6R1	1	0.135
P6R2	1	1.915

[ TABLE 8 ]

	Number of stagnation points	Location of stagnation 1
			P1R1	0
P1R2	0
			P2R1	0
P2R2	0
			P3R1	1	1.415
P3R2	0
			P4R1	1	1.345
P4R2	0
			P5R1	1	1.125
P5R2	0
			P6R1	1	0.225
P6R2	1	2.215

Fig. 6 and 7 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 470nm, 555nm, and 650nm, 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 555nm 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 1.324mm, a full field image height of 3.25mm, a maximum field angle of 110.67 °, a wide angle, and a high profile, and has excellent optical characteristics with a sufficient correction of on-axis and off-axis chromatic aberration.

(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.

In the present embodiment, the stop S1 is disposed between the second lens L2 and the third lens L3.

[ 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	Position of reverse curvature 3
					P1R1	1	2.465
P1R2	1	1.445
					P2R1	0
P2R2	0
					P3R1	0
P3R2	0
					P4R1	1	0.725
P4R2	1	0.915
					P5R1	2	0.135	0.875
P5R2	2	0.445	0.805
					P6R1	3	0.155	0.735	1.345
P6R2	2	0.385	0.955

[ TABLE 12 ]

Fig. 10 and 11 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 470nm, 555nm, and 650nm, respectively, after 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 555nm 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 0.765mm, a full field image height of 3.25mm, a maximum field angle of 132.98 ° and a wide angle and thinness, and has excellent optical characteristics with its on-axis and off-axis chromatic aberration sufficiently corrected.

[ TABLE 13 ]

Parameter and condition formula	Example 1	Example 2	Example 3
				f	3.740	3.642	1.974
f1	-5.839	-6.669	-2.673
				f2	3.731	4.279	13.416
f3	6.369	6.168	2.962
				f4	3.700	3.524	3.787
f5	-3.200	-3.314	-4.016
				f6	744.940	1302.601	8.242
f12	9.891	11.801	-3.278
				FNO	2.85	2.75	2.58
FOV	100.71°	110.67°	132.98°
				R11/R12	19.53	2.09	6.43
d2/d4	0.39	0.65	0.97

FNO is the number of apertures F of the imaging optical lens.

f12 denotes a combined focal length of the first lens L1 and the second lens L2.

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, comprising six lens elements, 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 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 imaging optical lens has a maximum field angle FOV, a focal length f2, a radius of curvature R11 of an object-side surface of the sixth lens, a radius of curvature R12 of an image-side surface of the sixth 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 d4 from the image-side surface of the second lens to the object-side surface of the third lens, and the following relationships are satisfied:

100.00°≤FOV≤135.00°；

2.00≤R11/R12≤20.00；

0.30≤d2/ d4≤1.00；

0.80≤f2/f≤8.15。

2. the imaging optical lens of claim 1, wherein the first lens element has a convex object-side surface and a concave image-side surface;

the focal length of the image pickup optical lens is f, the focal length of the first lens is f1, the curvature radius of the object side surface of the first lens is R1, the curvature radius 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 image pickup optical lens is TTL, and the following relational expression is satisfied:

-3.66≤f1/f≤-0.90；

0.97≤(R1+R2)/(R1-R2)≤7.16；

0.03≤d1/TTL≤0.11。

3. the imaging optical lens according to claim 2, wherein the imaging optical lens satisfies the following relationship:

-2.29≤f1/f≤-1.13；

1.55≤(R1+R2)/(R1-R2)≤5.72；

0.04≤d1/TTL≤0.09。

4. the image-capturing optical lens of 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, and 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:

-25.56≤(R3+R4)/(R3-R4)≤2.12；

0.03≤d3/TTL≤0.13。

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

-15.98≤(R3+R4)/(R3-R4)≤1.70；

0.05≤d3/TTL≤0.10。

6. the imaging optical lens of claim 1, wherein the image-side surface of the third lens element is convex at the paraxial region;

the focal length of the image pickup optical lens is f, the focal length of the third lens is f3, 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 third lens is d5, the total optical length of the image pickup optical lens is TTL, and the following relational expression is satisfied:

0.75≤f3/f≤2.55；

-0.33≤(R5+R6)/(R5-R6)≤1.68；

0.03≤d5/TTL≤0.18。

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

1.20≤f3/f≤2.04；

-0.21≤(R5+R6)/(R5-R6)≤1.34；

0.04≤d5/TTL≤0.15。

8. the imaging optical lens of claim 1, wherein the fourth lens element has a concave object-side surface and a convex image-side surface;

the focal length of the image pickup optical lens is f, the focal length of the fourth lens is f4, the curvature radius of the object side surface of the fourth lens is R7, the curvature radius 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 image pickup optical lens is TTL, and the following relational expression is satisfied:

0.48≤f4/f≤2.88；

1.08≤(R7+R8)/(R7-R8)≤3.46；

0.04≤d7/TTL≤0.13。

9. the image-pickup optical lens according to claim 8, wherein the image-pickup optical lens satisfies the following relation:

0.77≤f4/f≤2.30；

1.73≤(R7+R8)/(R7-R8)≤2.77；

0.06≤d7/TTL≤0.11。

10. the imaging optical lens of claim 1, wherein the fifth lens element has a convex object-side surface and a concave image-side surface;

the focal length of the image pickup optical lens is f, 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, and the on-axis thickness of the fifth lens element is d9, the total optical length of the image pickup optical lens is TTL, and the following relations are satisfied:

-4.07≤f5/f≤-0.57；

0.65≤(R9+R10)/(R9-R10)≤3.59；

0.03≤d9/TTL≤0.11。

11. the image-pickup optical lens according to claim 10, wherein the image-pickup optical lens satisfies the following relation:

-2.54≤f5/f≤-0.71；

1.05≤(R9+R10)/(R9-R10)≤2.87；

0.05≤d9/TTL≤0.09。

12. the imaging optical lens of claim 1, wherein the sixth lens element has a concave object-side surface and a convex image-side surface;

the focal length of the image pickup optical lens is f, the focal length of the sixth lens is f6, the on-axis thickness of the sixth lens is d11, the total optical length of the image pickup optical lens is TTL, and the following relational expression is satisfied:

2.09≤f6/f≤536.44；

0.55≤(R11+R12)/(R11-R12)≤4.25；

0.03≤d11/TTL≤0.13。

13. the image-pickup optical lens according to claim 12, wherein the image-pickup optical lens satisfies the following relation:

3.34≤f6/f≤429.16；

0.89≤(R11+R12)/(R11-R12)≤3.40；

0.05≤d11/TTL≤0.10。

14. a camera optical lens according to claim 1, characterized in that the total optical length TTL of the camera optical lens is less than or equal to 9.23 mm.

15. A camera optical lens according to claim 14, characterized in that the total optical length TTL of the camera optical lens is less than or equal to 8.81 mm.

16. A camera optical lens according to claim 1, characterized in that the F-number of the aperture of the camera optical lens is less than or equal to 2.94.

17. A camera optical lens according to claim 16, characterized in that the F-number of the aperture of the camera optical lens is less than or equal to 2.88.