CN111025580B

CN111025580B - Image pickup optical lens

Info

Publication number: CN111025580B
Application number: CN201911373092.7A
Authority: CN
Inventors: 孙伟; 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: 2021-11-02
Anticipated expiration: 2039-12-27
Also published as: CN111025580A

Abstract

The invention relates to the field of optical lenses, and discloses an image pickup optical lens, which sequentially comprises the following components from an object side to an image side: a first lens element with positive 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 following relation is satisfied: FOV is more than or equal to 100.00 degrees and less than or equal to 135.00 degrees; f2/f is more than or equal to 1.00 and less than or equal to 3.00; R7/R8 is more than or equal to 10.00 and less than or equal to 30.00; d2/d10 is more than or equal to 1.00 and less than or equal to 10.00; d5/d6 is more than or equal to 1.40 and less than or equal to 6.00. 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 has good optical performance and satisfies the design requirements of ultra-thinning and wide-angle.

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 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 focal length f, the second lens element has a focal length f2, the fourth lens element has an object-side surface with a curvature radius R7, the fourth lens element has an image-side surface with a curvature radius R8, the first lens element has an on-axis distance from the image-side surface to the object-side surface of the second lens element d2, the third lens element has an on-axis thickness d5, the third lens element has an on-axis distance from the image-side surface to the object-side surface of the fourth lens element d6, the fifth lens element has an on-axis distance from the image-side surface to the object-side surface of the sixth lens element d10, and the imaging optical lens element has a maximum field angle FOV which satisfies the following relationships: FOV is more than or equal to 100.00 degrees and less than or equal to 135.00 degrees; f2/f is more than or equal to 1.00 and less than or equal to 3.00; R7/R8 is more than or equal to 10.00 and less than or equal to 30.00; d2/d10 is more than or equal to 1.00 and less than or equal to 10.00; d5/d6 is more than or equal to 1.40 and less than or equal to 6.00.

Preferably, the object side surface of the first lens is concave at the paraxial region; 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, and the total optical length of the imaging optical lens is TTL and satisfies the following relational expression: -4.10. ltoreq. f 1/f. ltoreq.10.55; -1.02 ≤ (R1+ R2)/(R1-R2) 9.38; d1/TTL is more than or equal to 0.03 and less than or equal to 0.32.

Preferably, the imaging optical lens satisfies the following relation: -2.56. ltoreq. f 1/f. ltoreq.8.44; -0.64 ≦ (R1+ R2)/(R1-R2) 7.50; d1/TTL is more than or equal to 0.05 and less than or equal to 0.26.

Preferably, the second lens object side surface is convex at the paraxial region; the curvature radius of the object side surface of the second lens is R3, the curvature radius 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 photographic optical lens is TTL, and the following relational expression is satisfied: -6.33 ≤ (R3+ R4)/(R3-R4) 0.48; d3/TTL is more than or equal to 0.03 and less than or equal to 0.27.

Preferably, the imaging optical lens satisfies the following relation: -3.96 ≤ (R3+ R4)/(R3-R4) 0.38; d3/TTL is more than or equal to 0.05 and less than or equal to 0.22.

Preferably, the third lens object side surface is convex at the paraxial region; 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, and the total optical length of the imaging optical lens is TTL and satisfies the following relation: f3/f is more than or equal to 1.45 and less than or equal to 529.55; -60.60 (R5+ R6)/(R5-R6) is 63.84 or less; d5/TTL is more than or equal to 0.02 and less than or equal to 0.15.

Preferably, the imaging optical lens satisfies the following relation: f3/f is more than or equal to 2.32 and less than or equal to 423.64; -37.88 (R5+ R6)/(R5-R6) 51.07; d5/TTL is more than or equal to 0.04 and less than or equal to 0.12.

Preferably, the object-side surface of the fourth lens element is convex in the paraxial region, and the image-side surface of the fourth lens element is concave in the paraxial region; the focal length of the fourth lens is f4, the on-axis thickness of the fourth lens is d7, the total optical length of the image pickup optical lens is TTL, and the following relational expression is satisfied: f4/f is not less than 4.97 and not more than-1.25; (R7+ R8)/(R7-R8) is not more than 0.53 and not more than 1.83; d7/TTL is more than or equal to 0.02 and less than or equal to 0.08.

Preferably, the imaging optical lens satisfies the following relation: f4/f is not less than-1.56 and is not less than-3.10; (R7+ R8)/(R7-R8) is not more than 0.86 and not more than 1.46; d7/TTL is more than or equal to 0.04 and less than or equal to 0.06.

Preferably, the image-side surface of the fifth lens element is convex in the paraxial region; 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, and the total optical length of the imaging optical lens assembly is TTL and satisfies the following relationship: f5/f is more than or equal to 0.28 and less than or equal to 1.36; (R9+ R10)/(R9-R10) is not more than 0.19 and not more than 1.88; d9/TTL is more than or equal to 0.08 and less than or equal to 0.27.

Preferably, the imaging optical lens satisfies the following relation: f5/f is more than or equal to 0.45 and less than or equal to 1.09; (R9+ R10)/(R9-R10) is not more than 0.30 and not more than 1.50; d9/TTL is more than or equal to 0.13 and less than or equal to 0.22.

Preferably, the object-side surface of the sixth lens element is convex in the paraxial region, and the image-side surface of the sixth lens element is concave in the paraxial region; the focal length of the sixth lens element is f6, the curvature radius of the object-side surface of the sixth lens element is R11, the curvature radius of the image-side surface of the sixth lens element is R12, the on-axis thickness of the sixth lens element is d11, and the total optical length of the imaging optical lens assembly is TTL and satisfies the following relation: f6/f is not less than 2.60 and not more than-0.48; (R11+ R12)/(R11-R12) is not more than 0.90 and not more than 4.19; d11/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 relation: f6/f is not less than 1.62 and not more than-0.60; 1.44-3.35 percent (R11+ R12)/(R11-R12); d11/TTL is more than or equal to 0.04 and less than or equal to 0.09.

Preferably, the total optical length TTL of the image pickup optical lens is less than or equal to 6.62 millimeters.

Preferably, the total optical length TTL of the image pickup optical lens is less than or equal to 6.32 millimeters.

Preferably, the F-number of the imaging optical lens is less than or equal to 2.52.

Preferably, the F-number of the imaging optical lens is less than or equal to 2.48.

Preferably, the combined focal length of the first lens and the second lens is f12, and the following relation is satisfied: f12/f is more than or equal to 0.69 and less than or equal to 2.93.

Preferably, the imaging optical lens satisfies the following relation: f12/f is more than or equal to 1.10 and less than or equal to 2.35.

The invention has the beneficial effects that: the imaging optical lens according to the present invention has excellent optical characteristics, has a wide angle of view and is made thinner, and is particularly suitable for a mobile phone imaging lens unit and a WEB imaging lens including an imaging element such as a high-pixel CCD or a CMOS.

Drawings

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

fig. 1 is a schematic configuration diagram of an imaging optical lens 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: the lens comprises a first lens L1, a diaphragm S1, 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.

In the present embodiment, the maximum field angle of the imaging optical lens 10 is defined as FOV, and the following relational expression is satisfied: the FOV is larger than or equal to 100.00 degrees and smaller than or equal to 135.00 degrees, the field angle of the camera optical lens 10 is defined, ultra-wide-angle camera shooting can be achieved within the range, and user experience is improved.

Defining the focal length f of the image pickup optical lens 10 and the focal length f2 of the second lens L2, the following relations are satisfied: f2/f is more than or equal to 1.00 and less than or equal to 3.00, 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.

The curvature radius of the object side surface of the fourth lens L4 is defined as R7, the curvature radius of the image side surface of the fourth lens L4 is defined as R8, and the following relational expressions are satisfied: R7/R8 is 10.00-30.00, the shape of the fourth lens is defined, and the problem of chromatic aberration on the axis can be corrected favorably as the lens is changed to a super-thin wide angle within the range.

Defining an on-axis distance d2 from an image-side surface of the first lens L1 to an object-side surface of the second lens L2, and an on-axis distance d10 from an image-side surface of the fifth lens L5 to an object-side surface of the sixth lens L6, the following relationships are satisfied: d2/d10 is more than or equal to 1.00 and less than or equal to 10.00, the ratio of the air interval between the first lens and the second lens to the air interval between the fifth lens and the sixth lens is specified, and the wide-angle development of the lens is facilitated when the ratio is within the range.

Defining the on-axis thickness of the third lens L3 as d5, and the on-axis distance from the image-side surface of the third lens L3 to the object-side surface of the fourth lens L4 as d6, the following relationships are satisfied: d5/d6 is more than or equal to 1.40 and less than or equal to 6.00, the ratio of the thickness of the third lens to the air space between the third lens and the fourth lens is specified, and the lens is favorable for the development of wide angle when in 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 the present embodiment, the object-side surface of the first lens element L1 is concave at the paraxial region.

The focal length of the image pickup optical lens 10 is f, the focal length of the first lens is f1, and the following relation is satisfied: 4.10. ltoreq. f 1/f. ltoreq.10.55, which specifies the ratio of the focal length of the first lens L1 to the overall focal length. When the refractive power of the first lens element is within the predetermined range, the first lens element has appropriate 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-2.56. ltoreq. f 1/f. ltoreq.8.44.

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, and the following relations are satisfied: -1.02 ≦ (R1+ R2)/(R1-R2) ≦ 9.38, and the shape of the first lens L1 is appropriately controlled so that the first lens L1 can effectively correct the system spherical aberration, preferably, satisfying-0.64 ≦ (R1+ R2)/(R1-R2) ≦ 7.50.

The total optical length of the imaging optical lens 10 is TTL, and the on-axis thickness of the first lens L1 is d1, which satisfies the following relationship: d1/TTL is more than or equal to 0.03 and less than or equal to 0.32, and ultra-thinning is facilitated. Preferably, 0.05. ltoreq. d 1/TTL. ltoreq.0.26 is satisfied.

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

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: and (R3+ R4)/(R3-R4) is not more than 6.33 and not more than 0.48, and the shape of the second lens L2 is defined, and when the shape is within the range, the problem of chromatic aberration on the axis is favorably corrected as the lens is developed to a super-thin wide angle. Preferably, it satisfies-3.96 ≦ (R3+ R4)/(R3-R4). ltoreq.0.38.

The on-axis thickness of the second lens L2 is d3, the total optical length of the imaging optical lens system 10 is TTL, and the following relationships are satisfied: d3/TTL is more than or equal to 0.03 and less than or equal to 0.27, and ultra-thinning is facilitated. Preferably, 0.05. ltoreq. d 3/TTL. ltoreq.0.22 is satisfied.

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

The focal length of the image pickup optical lens 10 is f, the focal length of the third lens L3 is f3, and the following relations are satisfied: f3/f 529.55 is more than or equal to 1.45, and the system has better imaging quality and lower sensitivity through reasonable distribution of focal power. Preferably, 2.32. ltoreq. f 3/f. ltoreq. 423.64 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: the (R5+ R6)/(R5-R6) is less than or equal to 60.60 and less than or equal to 63.84, 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, it satisfies-37.88 ≦ (R5+ R6)/(R5-R6). ltoreq. 51.07.

The on-axis thickness of the third lens L3 is d5, the total optical length of the imaging optical lens system 10 is TTL, and the following relationships are satisfied: d5/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 5/TTL. ltoreq.0.12 is satisfied.

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

The focal length of the image pickup optical lens 10 is f, the focal length of the fourth lens L4 is f4, and the following relations are satisfied: 4.97 ≦ f4/f ≦ -1.25, allowing better imaging quality and lower sensitivity of the system through reasonable distribution of optical power. Preferably, it satisfies-3.10. ltoreq. f 4/f. ltoreq-1.56.

The curvature radius of the object side surface of the fourth lens L4 is R7, the curvature radius of the image side surface of the fourth lens L4 is R8, and the following relations are satisfied: the (R7+ R8)/(R7-R8) is 0.53-1.83, and the shape of the fourth lens L4 is defined so that the problem of aberration of the off-axis angle can be corrected with the development of an ultra-thin wide angle within the range. Preferably, 0.86 ≦ (R7+ R8)/(R7-R8) ≦ 1.46.

The on-axis thickness of the fourth lens L4 is d7, the total optical length of the imaging optical lens system 10 is TTL, and the following relationships are satisfied: d7/TTL is more than or equal to 0.02 and less than or equal to 0.08, and ultra-thinning is facilitated. Preferably, 0.04. ltoreq. d 7/TTL. ltoreq.0.06 is satisfied.

In this embodiment, the image-side surface of the fifth lens element L5 is convex along the paraxial region thereof and has positive refractive power.

The focal length of the image pickup optical lens 10 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 0.28 and less than or equal to 1.36, 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, 0.45. ltoreq. f 5/f. ltoreq.1.09 is satisfied.

The curvature radius of the object side surface of the fifth lens L5 is R9, the curvature radius of the image side surface of the fifth lens L5 is R10, and the following relations are satisfied: the shape of the fifth lens L5 is defined to be not less than 0.19 (R9+ R10)/(R9-R10) and not more than 1.88, and when the shape is within the range, the aberration of the off-axis picture angle is favorably corrected with the development of ultra-thin and wide-angle. Preferably, 0.30. ltoreq. (R9+ R10)/(R9-R10). ltoreq.1.50 is satisfied.

The on-axis thickness of the fifth lens L5 is d9, the total optical length of the imaging optical lens system 10 is TTL, and the following relationships are satisfied: d9/TTL is more than or equal to 0.08 and less than or equal to 0.27, and ultra-thinning is facilitated. Preferably, 0.13. ltoreq. d 9/TTL. ltoreq.0.22 is satisfied.

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

The focal length of the image pickup optical lens 10 is f, the focal length of the sixth lens L6 is f6, and the following relationships are satisfied: 2.60 ≦ f6/f ≦ -0.48, allowing better imaging quality and lower sensitivity of the system through reasonable distribution of optical power. Preferably, it satisfies-1.62. ltoreq. f 6/f. ltoreq-0.60.

The curvature radius of the object-side surface of the sixth lens L6 is R11, and the curvature radius of the image-side surface of the sixth lens L6 is R12, which satisfy the following relations: the (R11+ R12)/(R11-R12) is not more than 0.90 and not more than 4.19, 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, 1.44 ≦ (R11+ R12)/(R11-R12). ltoreq.3.35 is satisfied.

The on-axis thickness of the sixth lens L6 is d11, the total optical length of the imaging optical lens system 10 is TTL, and the following relationships are satisfied: d11/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 11/TTL. ltoreq.0.09 is satisfied.

In this embodiment, the total optical length TTL of the image pickup optical lens 10 is less than or equal to 6.62 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 6.32 millimeters.

In the present embodiment, the number of apertures F of the imaging optical lens 10 is 2.52 or less. The large aperture is large, and the imaging performance is good. Preferably, the F-number of the imaging optical lens 10 is 2.48 or less.

In the present embodiment, the focal length of the imaging optical lens 10 is f, and the combined focal length of the first lens L1 and the second lens L2 is f12, which satisfy the following relation: f12/f is more than or equal to 0.69 and less than or equal to 2.93, and within the range of the conditional expression, the aberration and distortion of the image pickup optical lens 10 can be eliminated, and the back focal length of the image pickup optical lens 10 can be suppressed, so as to keep the miniaturization of the image lens system. Preferably, 1.10. ltoreq. f 12/f. ltoreq.2.35.

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 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	2	0.295	1.345
P1R2	0
					P2R1	1	0.485
P2R2	0
					P3R1	2	0.235	0.905
P3R2	1	0.465
					P4R1	3	0.055	0.385	0.785
P4R2	3	0.265	0.585	1.015
					P5R1	1	0.795
P5R2	1	1.325
					P6R1	2	0.445	1.435
P6R2	1	0.545

[ TABLE 4 ]

	Number of stagnation points	Location of stagnation 1	Location of standing pointDevice 2	Location of stagnation 3
					P1R1	1	0.545
P1R2	0
					P2R1	0
P2R2	0
					P3R1	1	0.465
P3R2	1	0.775
					P4R1	3	0.085	0.545	0.905
P4R2	1	1.195
					P5R1	1	1.585
P5R2	1	1.745
					P6R1	1	0.775
P6R2	1	1.365

Fig. 2 and 3 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm, 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 17 shown 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 0.852mm, a full field image height of 3.28mm, a maximum field angle of 134.80 ° and is wide-angle and ultra-thin, and has excellent optical characteristics with the on-axis and off-axis chromatic aberration thereof 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	2	0.245	1.235
P1R2	0
					P2R1	1	0.505
P2R2	0
					P3R1	1	0.245
P3R2	2	0.445	1.025
					P4R1	3	0.105	0.355	0.775
P4R2	3	0.285	0.535	1.035
					P5R1	1	0.515
P5R2	1	1.515
					P6R1	2	0.375	1.415
P6R2	3	0.505	2.315	2.445

[ TABLE 8 ]

Fig. 6 and 7 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm passing through the imaging optical lens 20 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 17, the second embodiment satisfies each conditional expression.

In the present embodiment, the imaging optical lens has an entrance pupil diameter of 0.993mm, a full field image height of 3.28mm, a maximum field angle of 129.00 ° and is wide-angle and ultra-thin, and has excellent optical characteristics with its 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 ]

Fig. 10 and 11 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm passing through the imaging optical lens 30 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 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.

(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 ]

[ TABLE 16 ]

	Number of stagnation points	Location of stagnation 1	Location of stagnation 2
				P1R1	1	1.925
P1R2	1	0.835
				P2R1	0
P2R2	1	0.735
				P3R1	1	0.575
P3R2	0
				P4R1	1	0.145
P4R2	2	0.685	1.195
				P5R1	0
P5R2	0
				P6R1	1	0.985
P6R2	1	1.745

Fig. 14 and 15 are schematic diagrams showing axial aberrations and chromatic aberrations of magnification of light having wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm 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 555nm after passing through the imaging optical lens 40 according to the fourth embodiment.

In the present embodiment, the imaging optical lens has an entrance pupil diameter of 1.415mm, a full field image height of 3.28mm, a maximum field angle of 101.00 ° and is wide-angle and ultra-thin, and has excellent optical characteristics with its on-axis and off-axis chromatic aberration sufficiently corrected.

[ TABLE 17 ]

Where Fno is the F-number of the stop of the image pickup optical lens, and F12 is the combined focal length of the first lens and the second 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, comprising six lens elements in order from an object side to an image side: a first lens element with positive 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 object side surface of the first lens is concave at the paraxial part; the object side surface of the second lens is convex at the paraxial part; the object side surface of the third lens is convex at the paraxial part; the object side surface of the fourth lens is a convex surface at the paraxial position, and the image side surface of the fourth lens is a concave surface at the paraxial position; the image side surface of the fifth lens is convex at the paraxial position; the object side surface of the sixth lens is a convex surface at the paraxial region, and the image side surface of the sixth lens is a concave surface at the paraxial region;

the imaging optical lens is characterized in that the F number of the diaphragm of the imaging optical lens is Fno, 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 fourth lens is R7, the radius of curvature of the image-side surface of the fourth lens is R8, the on-axis distance from the image-side surface of the first lens to the object-side surface of the second lens is d2, the on-axis thickness of the third lens is d5, the on-axis distance from the image-side surface of the third lens to the object-side surface of the fourth lens is d6, the on-axis distance from the image-side surface of the fifth lens to the object-side surface of the sixth lens is d10, and the maximum field angle of the imaging optical lens is FOV, which satisfy the following relational expression:

100.00°≤FOV≤135.00°；

1.00≤f2/f≤3.00；

10.00≤R7/R8≤30.00；

1.00≤d2/d10≤10.00；

1.40≤d5/d6≤6.00；

Fno≤2.52。

2. the imaging optical lens of claim 1, wherein the first lens has a focal length of f1, a radius of curvature of an object-side surface of the first lens is R1, a radius of curvature of an image-side surface of the first lens is R2, an on-axis thickness of the first lens is d1, and an optical total length of the imaging optical lens is TTL, and the following relationship is satisfied:

-4.10≤f1/f≤10.55；

-1.02≤(R1+R2)/(R1-R2)≤9.38；

0.03≤d1/TTL≤0.32。

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

-2.56≤f1/f≤8.44；

-0.64≤(R1+R2)/(R1-R2)≤7.50；

0.05≤d1/TTL≤0.26。

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

-6.33≤(R3+R4)/(R3-R4)≤0.48；

0.03≤d3/TTL≤0.27。

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

-3.96≤(R3+R4)/(R3-R4)≤0.38；

0.05≤d3/TTL≤0.22。

6. the imaging optical lens of claim 1, wherein the third lens has a focal length of f3, a radius of curvature of an object-side surface of the third lens is R5, a radius of curvature of an image-side surface of the third lens is R6, an on-axis thickness of the third lens is d5, and the imaging optical lens has a total optical length of TTL and satisfies the following relationship:

1.45≤f3/f≤529.55；

-60.60≤(R5+R6)/(R5-R6)≤63.84；

0.02≤d5/TTL≤0.15。

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

2.32≤f3/f≤423.64；

-37.88≤(R5+R6)/(R5-R6)≤51.07；

0.04≤d5/TTL≤0.12。

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

-4.97≤f4/f≤-1.25；

0.53≤(R7+R8)/(R7-R8)≤1.83；

0.02≤d7/TTL≤0.08。

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

-3.10≤f4/f≤-1.56；

0.86≤(R7+R8)/(R7-R8)≤1.46；

0.04≤d7/TTL≤0.06。

10. the image-capturing optical lens unit according to claim 1, wherein the fifth lens element has a focal length f5, a radius of curvature of an object-side surface of the fifth lens element is R9, a radius of curvature of an image-side surface of the fifth lens element is R10, an on-axis thickness of the fifth lens element is d9, an optical total length of the image-capturing optical lens unit is TTL, and the following relationship is satisfied:

0.28≤f5/f≤1.36；

0.19≤(R9+R10)/(R9-R10)≤1.88；

0.08≤d9/TTL≤0.27。

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

0.45≤f5/f≤1.09；

0.30≤(R9+R10)/(R9-R10)≤1.50；

0.13≤d9/TTL≤0.22。

12. the image-capturing optical lens unit according to claim 1, wherein the sixth lens element has a focal length f6, a radius of curvature of an object-side surface of the sixth lens element is R11, a radius of curvature of an image-side surface of the sixth lens element is R12, an on-axis thickness of the sixth lens element is d11, an optical total length of the image-capturing optical lens unit is TTL, and the following relationship is satisfied:

-2.60≤f6/f≤-0.48；

0.90≤(R11+R12)/(R11-R12)≤4.19；

0.03≤d11/TTL≤0.11。

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

-1.62≤f6/f≤-0.60；

1.44≤(R11+R12)/(R11-R12)≤3.35；

0.04≤d11/TTL≤0.09。

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 6.62 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 6.32 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 2.48.

17. The imaging optical lens according to claim 1, wherein a combined focal length of the first lens and the second lens is f12, and the following relationship is satisfied:

0.69≤f12/f≤2.93。

18. the image-pickup optical lens according to claim 17, wherein the image-pickup optical lens satisfies the following relationship:

1.10≤f12/f≤2.35。