CN105319677B - Six chip imaging lens groups - Google Patents

Abstract

The invention discloses a kind of six chips imaging lens group, the six chips imaging lens group includes：Optical image capture lens head, imaging surface and fixed aperture.Optical image capture lens head includes：First lens, are convex surface with positive refractive power and its image side optical surface；Second lens, are convex surface with negative refractive power and its thing side optical surface；3rd lens, are concave surface with refractive power and its image side optical surface；4th lens, with refractive power；5th lens, its image side optical surface and thing side optical surface are convex surface；6th lens, its image side optical surface and thing side optical surface are concave surface, at least one side is aspherical in the thing side optical surface and image side optical surface of second lens and the 4th lens, and at least one side is provided with least one point of inflexion in the thing side optical surface and image side optical surface of the 3rd lens, the 5th lens and the 6th lens.

Description

Six-piece imaging lens group

technical field

The invention relates to a lens, in more detail, to a six-piece imaging lens group composed of six lenses for high-quality imaging to be applied to 3C products.

Background technique

At present, optical image capture lenses are usually installed on digital carriers such as mobile phones, game consoles, PC CAM, DSC or DVC to capture images of objects, and the trend of optical image capture lenses is also moving toward miniaturization , increase the total pixels and low cost, but also need to have good aberration correction capability, high resolution and high imaging quality.

Because the traditional spherical ground glass lens has more material options, and the lens made of glass is more beneficial for correcting chromatic aberration, it has been widely used in the industry. When the (Wide-angle) is large, it is difficult to correct aberrations such as spherical aberration. In order to improve the shortcomings of the above-mentioned traditional spherical ground glass lens, the current imaging device has used an aspheric plastic lens or an aspheric molded glass sheet to obtain better imaging quality. However, the above-mentioned optical imaging device at present The structure generally requires the use of more lens combinations to obtain better optical characteristics, resulting in the length of the entire optical imaging device being too large, making the imaging device unable to have a smaller volume and lower cost, and it is difficult to meet the requirements of light, thin and short electronic products .

Therefore, there is an urgent need for an optical image capture module that can shorten the total length of the optical image capture lens and effectively combine multiple groups of lenses to further improve the imaging quality.

Contents of the invention

In view of the problems existing in the prior art, the purpose of the present invention is to provide a six-piece imaging lens group, which can utilize the refractive power of the six lenses, the combination of convex and concave surfaces, and the matching of lens materials, thereby effectively shortening the time for optical image capture. The total length of the lens can further improve the imaging quality and be applied to small electronic products.

One of the objectives of the present invention is to propose a six-piece imaging lens group, the six-piece imaging lens group includes: an optical image capture lens, including: a first lens in sequence from the object side to the image side along the optical axis , the first lens has positive refractive power near the optical axis, and the image-side optical surface of the first lens is convex near the optical axis; the second lens, the second lens has negative refractive power near the optical axis, and the second lens The object-side optical surface of the second lens is a convex surface near the optical axis, and at least one of the object-side optical surface and the image-side optical surface of the second lens is an aspheric surface; the third lens has a refractive power near the optical axis, and The image-side optical surface of the third lens is concave near the optical axis, and at least one of the object-side optical surface and the image-side optical surface of the third lens is provided with at least one inflection point; The optical axis has refractive power, and at least one of the object-side optical surface and the image-side optical surface of the fourth lens is an aspheric surface; the fifth lens, the image-side optical surface and the object-side optical surface of the fifth lens are near the optical axis It is a convex surface, and at least one of the object side optical surface and the image side optical surface of the fifth lens is provided with at least one inflection point; and the sixth lens, the image side optical surface and the object side optical surface of the sixth lens are near the light The axis is a concave surface, and at least one of the object-side optical surface and the image-side optical surface of the sixth lens is provided with at least one inflection point; an imaging surface, on which the subject is imaged; and a fixed diaphragm, Set between the subject and the first lens; wherein, the distance from the object-side optical surface of the first lens to the image-side optical surface of the sixth lens on the optical axis is OL, and the entrance pupil of the six-piece imaging lens group The diameter is EPD, and the OL and EPD satisfy the following relationship: 1.5<OL/EPD<2.5, and at least two of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens The absolute value of the focal length of each lens is less than 5mm.

More preferably, the Abbe number of the second lens is vd2, and said vd2 satisfies the following relationship:

vd2≤30.

More preferably, the distance from the image-side optical surface of the second lens to the object-side optical surface of the third lens is D23 on the optical axis, and the distance from the image-side optical surface of the fourth lens to the object of the fifth lens on the optical axis The distance of the side optical surface is D45, and the D23 and D45 satisfy the following relationship:

3.5<D23/D45<10.

More preferably, the distance from the object-side optical surface of the first lens to the imaging surface on the optical axis is TL, and the radius of curvature of the object-side optical surface of the first lens is R1, and the TL and R1 satisfy the following relationship:

1<TL/R1<2.5.

More preferably, the distance from the image-side optical surface of the first lens to the object-side optical surface of the second lens on the optical axis is D12, the focal length of the first lens is f1, and the D12 and f1 satisfy the following relationship:

0.015<D12/f1<0.04.

More preferably, the sum of the center thicknesses of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens is Σ(CT), the focal length of the optical image capturing lens is f, and the Σ(CT) and f satisfy the following relationship: 0.6<Σ(CT)/f<1.

More preferably, the radius of curvature of the image side optical surface of the first lens is R2, the curvature radius of the object side optical surface of the second lens is R3, the curvature radius of the image side optical surface of the fifth lens is R10, and the sixth lens The radius of curvature of the object-side optical surface is R11, and the R2, R3, R10, and R11 satisfy the following relationship: 0.3<(R2-R3)/(R10+R11)<2.5.

More preferably, the absolute value of the focal length of the first lens, the third lens or the sixth lens is less than 5 mm.

More preferably, the fourth lens, the fifth lens and the sixth lens are all made of plastic.

Another object of the present invention is to propose a six-piece imaging lens group, the six-piece imaging lens group includes: an optical image capture lens, including: a first lens in sequence from the object side to the image side along the optical axis , the first lens has positive refractive power near the optical axis, and the image-side optical surface of the first lens is convex near the optical axis; the second lens, the second lens has negative refractive power near the optical axis, and the second lens The object-side optical surface of the second lens is a convex surface near the optical axis, and at least one of the object-side optical surface and the image-side optical surface of the second lens is an aspheric surface; the third lens has a refractive power near the optical axis, and The image-side optical surface of the third lens is concave near the optical axis, and at least one of the object-side optical surface and the image-side optical surface of the third lens is provided with at least one inflection point; There is refractive power at the optical axis, and at least one of the object-side optical surface and the image-side optical surface of the fourth lens is provided with at least one inflection point; the fifth lens has positive refractive power near the optical axis, and the fifth lens has positive refractive power near the optical axis, and the fourth lens The image-side optical surface and the object-side optical surface of the fifth lens are convex near the optical axis, and at least one of the object-side optical surface and the image-side optical surface of the fifth lens is provided with at least one inflection point; and the sixth lens, The sixth lens has negative refractive power near the optical axis, and the image-side optical surface and the object-side optical surface of the sixth lens are concave surfaces near the optical axis, and at least One side is provided with at least one inflection point; an imaging surface, on which the object is imaged; and a fixed diaphragm, wherein the first lens, the second lens, the third lens, the fourth lens, and the fifth lens And the absolute value of the focal length of at least two lenses in the sixth lens is less than 5 mm, the radius of curvature of the image-side optical surface of the second lens is R4, and the curvature radius of the object-side optical surface of the third lens is R5, and the above parameters satisfy the following Relational formula: R5–R4<0.5mm.

More preferably, the entrance pupil diameter of the six-piece imaging lens group is EPD, and the EPD satisfies the following relationship: 1.2mm<EPD<2.0mm.

More preferably, the distance from the object-side optical surface of the first lens to the imaging surface on the optical axis is TL, and the radius of curvature of the object-side optical surface of the first lens is R1, and the TL and R1 satisfy the following relationship:

1<TL/R1<2.5.

More preferably, the distance from the image-side optical surface of the first lens to the object-side optical surface of the second lens on the optical axis is D12, the focal length of the first lens is f1, and the D12 and f1 satisfy the following relationship:

0.015<D12/f1<0.04.

More preferably, the sum of the central thicknesses of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens is Σ(CT), the focal length of the optical image capturing lens is f, and the Σ(CT) and f satisfy the following relationship: 0.6<Σ(CT)/f<1.

More preferably, the radius of curvature of the image side optical surface of the first lens is R2, the curvature radius of the object side optical surface of the second lens is R3, the curvature radius of the image side optical surface of the fifth lens is R10, and the sixth lens The radius of curvature of the object-side optical surface is R11, and the R2, R3, R10, and R11 satisfy the following relationship:

0.3<(R2-R3)/(R10+R11)<2.5.

More preferably, the third lens has positive refractive power near the optical axis.

More preferably, the absolute value of the focal length of the first lens, the third lens or the sixth lens is less than 5 mm.

More preferably, the Abbe number of the first lens is vd1, the Abbe number of the second lens is vd2, and the vd1 and vd2 satisfy the following relationship: 25<vd1-vd2<35.

More preferably, the fixed aperture is arranged between the subject and the first lens.

Description of drawings

The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the accompanying drawings, in which:

FIG. 1A is a schematic diagram of a six-piece imaging lens group according to a first embodiment of the present invention.

FIG. 1B is a graph of spherical aberration, astigmatic field curvature and distortion according to the first embodiment of the present invention.

FIG. 2A is a schematic diagram of a six-piece imaging lens group according to a second embodiment of the present invention.

2B is a graph of spherical aberration, astigmatism and distortion aberration according to the second embodiment of the present invention.

FIG. 3A is a schematic diagram of a six-piece imaging lens group according to a third embodiment of the present invention.

3B is a graph of spherical aberration, astigmatism and distortion aberration according to the third embodiment of the present invention.

FIG. 4A is a schematic diagram of a six-piece imaging lens group according to a fourth embodiment of the present invention.

4B is a graph of spherical aberration, astigmatism and distortion aberration according to the fourth embodiment of the present invention.

FIG. 5A is a schematic diagram of a six-piece imaging lens group according to a fifth embodiment of the present invention.

5B is a graph of spherical aberration, astigmatism and distortion aberration according to the fifth embodiment of the present invention.

[Symbol Description]

Entrance pupil diameter of EPD six-element imaging lens set

vd1 Abbe number of the first lens

vd2 Abbe number of the second lens

D12 The distance from the image-side optical surface of the first lens to the object-side optical surface of the second lens on the optical axis

D23 The distance from the image-side optical surface of the second lens to the object-side optical surface of the third lens on the optical axis

D45 The distance from the image-side optical surface of the fourth lens to the object-side optical surface of the fifth lens on the optical axis

TL is the distance from the object-side optical surface of the first lens to the imaging surface on the optical axis

OL is the distance from the object-side optical surface of the first lens to the image-side optical surface of the sixth lens on the optical axis

R1 The radius of curvature of the object-side optical surface of the first lens

R2 The radius of curvature of the image-side optical surface of the first lens

R3 The radius of curvature of the object-side optical surface of the second lens

R4 The radius of curvature of the image-side optical surface of the second lens

R5 The radius of curvature of the object-side optical surface of the third lens

R10 The radius of curvature of the image-side optical surface of the fifth lens

R11 The radius of curvature of the object-side optical surface of the sixth lens

Σ(CT) The sum of the central thickness of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens

f The focal length of the optical image capture lens

f1 focal length of the first lens f2 focal length of the second lens

f3 focal length of the third lens f4 focal length of the fourth lens

f5 focal length of fifth lens f6 focal length of sixth lens

101 Object-side optical surface of the first lens 102 Image-side optical surface of the first lens

201 Object-side optical surface of the second lens 202 Image-side optical surface of the second lens

301 Object-side optical surface of the third lens 302 Image-side optical surface of the third lens

401 The object-side optical surface of the fourth lens 402 The image-side optical surface of the fourth lens

501 The object-side optical surface of the fifth lens 502 The image-side optical surface of the fifth lens

601 The object-side optical surface of the sixth lens 602 The image-side optical surface of the sixth lens

100 Fixed aperture 160 IR cut filter

170 imaging surface 180 electronic photosensitive component

10 First lens 20 Second lens

30 third lens 40 fourth lens

50 fifth lens 60 sixth lens

detailed description

As used herein, the term "and/or" includes any or all combinations of one or more of the associated listed items. When the statement "at least one of" is appended to a list of components, it modifies the entire list component and not the individual components of the list.

Please refer to FIG. 1A . FIG. 1A is a schematic diagram showing a six-piece imaging lens set according to a first embodiment of the present invention. As shown in FIG. 1A, the present invention includes an optical image capture lens, and the optical image capture lens sequentially includes a first lens 10, a second lens 20, and a third lens 30 along the optical axis from the object side to the image side. , the fourth lens 40 , the fifth lens 50 and the sixth lens 60 .

The first lens 10 has positive refractive power near the optical axis and the image-side optical surface 102 of the first lens is convex. The second lens 20 has a negative refractive power near the optical axis and the object side optical surface 201 of the second lens is a convex surface, and at least one side of the object side optical surface 201 of the second lens and the image side optical surface 202 of the second lens is non-convex. Spherical, the third lens 30 has refractive power near the optical axis, the image side optical surface 302 of the third lens is concave, and at least one of the object side optical surface 301 of the third lens and the image side optical surface 302 of the third lens There is at least one inflection point.

The fourth lens 40 has a refractive power near the optical axis, and at least one side of the object side optical surface 401 of the fourth lens and the image side optical surface 402 of the fourth lens is an aspheric surface, or is on the object side optical surface of the fourth lens. 401 and at least one side of the image side optical surface 402 of the fourth lens is provided with at least one inflection point, the fifth lens 50 has positive refractive power near the optical axis, the object side optical surface 501 of the fifth lens and the fifth lens The image-side optical surface 502 is convex near the optical axis, and at least one of the object-side optical surfaces 501 of the fifth lens and the image-side optical surface 502 of the fifth lens is provided with at least one inflection point, and the sixth lens The object-side optical surface 601 and the image-side optical surface 602 of the sixth lens are all concave surfaces near the optical axis, and at least one side of the object-side optical surface 601 of the sixth lens and the image-side optical surface 602 of the sixth lens is provided with At least one inflection point. The first embodiment is illustrated by taking the sixth lens 60 with positive refractive power as an example, but it is not limited thereto, and it can also be implemented by making the sixth lens 60 have negative refractive power.

In the present invention, the aspherical optical surface can be made into a shape other than a spherical surface to obtain more control variables and reduce aberrations, thereby providing better resolution and compactness between lenses and effectively reducing the total length of the lens.

The six-piece imaging lens set of the present invention further includes a fixed diaphragm 100 and an infrared filter (also called a filter sheet) 160 , and the fixed diaphragm 100 is disposed between the subject and the first lens 10 . The infrared filtering filter 160 is disposed between the sixth lens 60 and the imaging surface 170, and the infrared filtering filter 160 is usually made of flat optical material, which does not affect the focal length of the imaging lens group of the present invention.

The six-piece imaging lens group also includes an electronic photosensitive component 180 disposed on the imaging surface 170 to image the subject. The first lens 10 , the second lens 20 and the third lens 30 are made of plastic or glass, and the fourth lens 40 , fifth lens 50 and sixth lens 60 are made of plastic. The equation of the aspheric surface of the present invention is:

[mathematical formula 1]

z=ch ² /[1+[1-(k+1)c ² h ² ] ^0.5 ]+Ah ⁴ +Bh ⁶ +Ch ⁸ +Dh ¹⁰ +Eh ¹² +Fh ¹⁴ +Gh ¹⁶ +Hh ¹⁸ +Jh ²⁰ +… (1)

Among them, z is the position value at the height h along the optical axis with the surface vertex as a reference, k is the cone constant, c is the reciprocal of the radius of curvature, and A, B, C, D, E, F, G , H and J are high-order aspheric coefficients.

The distance from the object-side optical surface of the first lens 10 to the image-side optical surface of the sixth lens 60 on the optical axis is OL, the entrance pupil diameter of the six-piece imaging lens group is EPD, and the OL, EPD satisfies the following relationship:

1.5<OL/EPD<2.5.

The Abbe number of the second lens 20 is vd2, and said vd2 satisfies the following relationship:

vd2≤30.

The distance from the image-side optical surface of the second lens 20 to the object-side optical surface of the third lens 30 on the optical axis is D23, and on the optical axis from the image-side optical surface of the fourth lens 40 to the fifth The distance of the object-side optical surface of the lens 50 is D45, and the D23 and D45 satisfy the following relationship:

3.5<D23/D45<10.

The distance from the object-side optical surface of the first lens 10 to the imaging surface on the optical axis is TL, and the radius of curvature of the object-side optical surface of the first lens 10 is R1, and the TL and R1 satisfy the following relationship :

1<TL/R1<2.5.

The distance from the image-side optical surface of the first lens 10 to the object-side optical surface of the second lens 20 on the optical axis is D12, the focal length of the first lens 10 is f1, and the D12 and f1 satisfy the following relationship:

0.015<D12/f1<0.04.

The sum of the central thicknesses of the first lens 10, the second lens 20, the third lens 30, the fourth lens 40, the fifth lens 50 and the sixth lens 60 is Σ(CT), and the focal length of the optical image capturing lens is f, the Σ (CT), f satisfy the following relationship:

0.6<Σ(CT)/f<1.

The radius of curvature of the image side optical surface of the first lens 10 is R2, the curvature radius of the object side optical surface of the second lens 20 is R3, the curvature radius of the image side optical surface of the fifth lens 50 is R10, and the sixth lens 60 The radius of curvature of the object-side optical surface is R11, and the R2, R3, R10, and R11 satisfy the following relationship:

0.3<(R2-R3)/(R10+R11)<2.5.

The radius of curvature of the image-side optical surface of the second lens 20 is R4, the radius of curvature of the object-side optical surface of the third lens 30 is R5, and the R4 and R5 satisfy the following relationship:

R5–R4<0.5mm.

The entrance pupil diameter of the six-piece imaging lens group is EPD, and the EPD satisfies the following relationship:

1.2mm<EPD<2.0mm.

The Abbe number of the first lens 10 is vd1, and the Abbe number of the second lens 20 is vd2, and the vd1 and vd2 satisfy the following relationship:

25<vd1-vd2<35.

The optical data of the first embodiment is shown in Table 1, wherein the object-side optical surfaces and image-side optical surfaces of the first lens 10 to the sixth lens 60 are all formed using the aspheric equation of formula (1), and the aspheric surfaces The coefficients are shown in Table 2, and its reference wavelength is d-line 587nm, wherein, the distance TL from the object-side optical surface of the first lens to the imaging surface on the optical axis is 4.59mm, and the distance TL from the first lens on the optical axis The distance OL from the object-side optical surface of the lens to the image-side optical surface of the sixth lens is 3.439mm, the focal length f of the optical image capture lens is 3.519mm, and the curvature radius R1 of the object-side optical surface of the first lens is 2.036mm. The radius of curvature R2 of the image-side optical surface of the first lens is -10.000mm, the curvature radius R3 of the object-side optical surface of the second lens is 10.000mm, and the curvature radius R4 of the image-side optical surface of the second lens is 1.976mm. The curvature radius R5 of the object-side optical surface of the three lenses is 2.125mm, the curvature radius R10 of the image-side optical surface of the fifth lens is -4.321mm, and the curvature radius R11 of the object-side optical surface of the sixth lens is -4.046mm.

The distance D12 from the image-side optical surface of the first lens to the object-side optical surface of the second lens on the optical axis is 0.115mm, and the distance D12 from the image-side optical surface of the second lens to the object-side optical surface of the third lens on the optical axis The surface distance D23 is 0.253mm, the distance D45 from the image-side optical surface of the fourth lens to the object-side optical surface of the fifth lens on the optical axis is 0.027mm, and the entrance pupil diameter EPD of the six-piece imaging lens group is 1.738 mm, the sum of thickness Σ(CT) of the center of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens is 2.426mm, the focal length f1 of the first lens is 3.218mm, the second The focal length f2 of the lens is -3.894mm, the focal length f3 of the third lens is 4.950mm, the focal length f4 of the fourth lens is 4.171mm, the focal length f5 of the fifth lens is 4.950mm, and the focal length f6 of the sixth lens is -1.765mm. The Abbe number vd1 of the first lens was 55.7, and the Abbe number vd2 of the second lens was 22.4. TL/R1=2.254, D23/D45=9.376, OL/EPD=1.797, D12/f1=0.036, ΣCT/f=0.689, (R2-R3)/(R10+R11)=2.390, vd1-vd2=33.3, R5-R4=0.149.

[Table 1] Basic lens data of the first embodiment

[Table 2] Aspheric coefficients of the first embodiment

It can be seen from the basic lens data in Table 1 and the aberration curve in FIG. 1B that the six-element imaging lens set provided by this embodiment has a good compensation effect on astigmatism, distortion and spherical aberration.

Please refer to FIG. 2A . FIG. 2A is a schematic diagram showing a six-piece imaging lens set according to a second embodiment of the present invention. As shown in FIG. 2A , the object-side optical surfaces and the image-side optical surfaces of the first lens 10 to the sixth lens 60 are formed using the aspheric equation of formula (1), and their aspheric coefficients are shown in Table 4, and Its reference wavelength is d-line 587nm.

The optical data of the second embodiment is shown in Table 3, wherein the distance TL from the object-side optical surface of the first lens to the imaging surface on the optical axis is 4.59 mm, and the distance TL from the object-side optical surface of the first lens on the optical axis is 4.59 mm. The distance OL from the side optical surface to the image-side optical surface of the sixth lens is 3.293mm, the focal length f of the optical image capture lens is 3.189mm, the curvature radius R1 of the object-side optical surface of the first lens is 2.636mm, and the first lens The radius of curvature R2 of the image side optical surface of the second lens is -6.138mm, the curvature radius R3 of the object side optical surface of the second lens is 10.000mm, the curvature radius R4 of the image side optical surface of the second lens is 1.926mm, and the third lens The curvature radius R5 of the object-side optical surface is 2.121mm, the curvature radius R10 of the image-side optical surface of the fifth lens is -6.819mm, and the curvature radius R11 of the object-side optical surface of the sixth lens is -6.421mm.

The distance D12 from the image-side optical surface of the first lens to the object-side optical surface of the second lens on the optical axis is 0.121 mm, and the distance D12 from the image-side optical surface of the second lens to the object-side optical surface of the third lens on the optical axis The surface distance D23 is 0.213mm, the distance D45 from the image-side optical surface of the fourth lens to the object-side optical surface of the fifth lens on the optical axis is 0.027mm, and the entrance pupil diameter EPD of the six-piece imaging lens group is 1.571 mm, the sum of thickness Σ(CT) of the center of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens is 2.292mm, the focal length f1 of the first lens is 3.527mm, the second The focal length f2 of the lens is -3.771mm, the focal length f3 of the third lens is 4.950mm, the focal length f4 of the fourth lens is 3.186mm, the focal length f5 of the fifth lens is 3.938mm, and the focal length f6 of the sixth lens is -1.642mm. The Abbe number vd1 of the first lens was 55.7, and the Abbe number vd2 of the second lens was 22.4. TL/R1=1.741, D23/D45=7.886, OL/EPD=2.095, D12/f1=0.034, ΣCT/f=0.719, (R2-R3)/(R10+R11)=1.219, vd1-vd2=33.3, R5-R4=0.195.

[Table 3] Basic lens data of the second embodiment

[Table 4] Aspheric coefficients of the second embodiment

optical surface 1 2 3 4 5 6 k -19.6062 17.3812 -1458.4591 -12.0623 -30.3947 -220.4687 A 0.0908 -0.0460 -0.1323 -0.1941 0.1502 0.0126 B -0.1384 0.2032 0.6179 0.8046 -0.4997 -0.0656 C 0.1162 -0.4979 -1.5004 -1.7608 0.9111 0.0613 D. -0.1932 0.3822 2.0412 2.2760 -1.1318 -0.1162 E. 0.2071 -0.0850 -1.8821 -1.8541 0.8018 -0.0956 f -0.1237 0.0057 1.1040 0.8802 -0.2698 -0.0466 G -0.0077 0.0000 -0.3090 -0.1857 0.0322 0.0138 h 0.0157 0.0000 0.0000 0.0000 0.0000 0.0000 J 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 optical surface 7 8 9 10 11 12 k -0.1008 -3.0359 -16.9940 0.0000 0.0000 -4.6647

A 0.1850 -0.1375 -0.0273 0.0181 0.0824 -0.0811 B 0.0423 0.1543 -0.0049 0.1619 -0.0720 0.0354 C -0.4219 -0.1597 0.0705 -0.1648 0.0329 -0.0149 D. 0.9587 0.1338 -0.0911 0.0627 -0.0078 0.0048 E. -0.9634 0.0121 0.0410 -0.0107 0.0009 -0.0010 f 0.4661 -0.0546 -0.0078 0.0007 -4.6470e-5 0.0001 G -0.0912 0.0152 0.0005 0.0000 0.0000 -4.8329e-6 h 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 J 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000

It can be known from the basic lens data in Table 3 and the aberration curve in FIG. 2B that the six-element imaging lens set provided by this embodiment has a good compensation effect on astigmatism, distortion and spherical aberration.

Please refer to FIG. 3A . FIG. 3A is a schematic diagram showing a six-piece imaging lens group according to a third embodiment of the present invention. As shown in FIG. 3A , wherein, the object-side optical surfaces and the image-side optical surfaces of the first lens 10 to the sixth lens 60 are formed by the aspheric surface equation of formula (1), and the aspheric surface coefficients thereof are shown in Table 6, And its reference wavelength is d-line 587 nm.

The optical data of the third embodiment is shown in Table 5, wherein the distance TL from the object-side optical surface of the first lens to the imaging surface on the optical axis is 3.03mm, and the distance TL from the object-side optical surface of the first lens on the optical axis The distance OL from the side optical surface to the image-side optical surface of the sixth lens is 2.147mm, the focal length f of the optical image capture lens is 1.861mm, the curvature radius R1 of the object-side optical surface of the first lens is 2.529mm, and the first lens The radius of curvature R2 of the image side optical surface of the second lens is -2.023mm, the curvature radius R3 of the object side optical surface of the second lens is 4.697mm, the curvature radius R4 of the image side optical surface of the second lens is 1.070mm, and the third lens The curvature radius R5 of the object-side optical surface is 1.266 mm, the curvature radius R10 of the image-side optical surface of the fifth lens is -5.051 mm, and the curvature radius R11 of the object-side optical surface of the sixth lens is -9.271 mm.

The distance D12 from the image-side optical surface of the first lens to the object-side optical surface of the second lens on the optical axis is 0.049 mm, and the distance D12 from the image-side optical surface of the second lens to the object-side optical surface of the third lens on the optical axis The surface distance D23 is 0.100mm, the distance D45 from the image-side optical surface of the fourth lens to the object-side optical surface of the fifth lens on the optical axis is 0.025mm, and the entrance pupil diameter EPD of the six-piece imaging lens group is 1.014 mm, the sum of thickness Σ(CT) of the center of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens is 1.723mm, the focal length f1 of the first lens is 2.178mm, the second The focal length f2 of the lens is -2.211mm, the focal length f3 of the third lens is 2.685mm, the focal length f4 of the fourth lens is 2.048mm, the focal length f5 of the fifth lens is 2.277mm, and the focal length f6 of the sixth lens is -1.065mm. The Abbe number vd1 of the first lens was 55.7, and the Abbe number vd2 of the second lens was 22.4. TL/R1=1.198, D23/D45=4.000, OL/EPD=2.117, D12/f1=0.022, ΣCT/f=0.926, (R2-R3)/(R10+R11)=0.469, vd1-vd2=33.3, R5-R4=0.196.

[Table 5] Basic lens data of the third embodiment

[table six] aspheric coefficients of the third embodiment

optical surface 1 2 3 4 5 6

k -59.5118 8.1542 -1458.4591 -23.6867 -28.9091 -220.4687 A 0.2721 -0.1082 -0.1913 0.1889 0.4896 -0.0479 B -1.4495 1.3927 -1.9985 -2.4736 -4.9990 3.2732 C 3.1449 -10.9095 27.1444 19.4929 24.4922 -25.6788 D. -11.6171 24.2633 -206.4313 -101.8065 -84.9720 110.6182 E. 30.5602 -12.1181 700.6853 265.6365 180.0676 -286.0730 f -52.0471 -13.6534 -1136.0508 -333.7620 -189.5141 384.0016 G -3.7589 3.5718 704.1745 159.0128 72.0435 -203.8223 h 40.9976 0.0000 0.0000 0.0000 0.0000 0.0000 J 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 optical surface 7 8 9 10 11 12 k -0.4752 -2.6534 -17.0835 0.0000 0.0000 -4.6285 A 1.2074 -0.7134 -0.3415 0.1365 0.7985 -0.1391 B 2.0750 3.2732 1.4872 1.5802 -1.9566 -0.0387 C 13.4792 -7.6375 -2.3726 -4.1114 2.1158 0.0680 D. 66.0102 8.9294 0.9111 3.9174 -1.1855 -0.0232 E. -191.6637 11.7984 0.2918 -1.6707 0.3408 0.0003 f 268.0484 -37.3911 -0.1490 0.2684 -0.0401 3.3655e-5 G -143.1342 23.5515 -0.0052 0.0000 0.0000 0.0002 h 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 J 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000

It can be seen from the basic lens data in Table 5 and the aberration curve in FIG. 3B that the six-element imaging lens set provided by this embodiment has a good compensation effect on astigmatism, distortion and spherical aberration.

Please refer to FIG. 4A . FIG. 4A is a schematic diagram showing a six-piece imaging lens group according to a fourth embodiment of the present invention. As shown in FIG. 4A, wherein, the object-side optical surfaces and the image-side optical surfaces of the first lens 10 to the sixth lens 60 are all formed using the aspheric equation of formula (1), and their aspheric coefficients are as shown in Table 8, And its reference wavelength is d-line 587nm.

The optical data of the fourth embodiment is shown in Table 7, wherein the distance TL from the object side optical surface of the first lens to the imaging surface on the optical axis is 4.05 mm, and the distance TL from the object side optical surface of the first lens on the optical axis is 4.05 mm. The distance OL from the side optical surface to the image-side optical surface of the sixth lens is 3.010mm, the focal length f of the optical image capture lens is 2.882mm, the curvature radius R1 of the object-side optical surface of the first lens is 1.867mm, and the first lens The radius of curvature R2 of the image side optical surface of the second lens is -6.208mm, the curvature radius R3 of the object side optical surface of the second lens is 8.163mm, the curvature radius R4 of the image side optical surface of the second lens is 1.681mm, and the third lens The curvature radius R5 of the object-side optical surface is 1.910 mm, the curvature radius R10 of the image-side optical surface of the fifth lens is -3.061 mm, and the curvature radius R11 of the object-side optical surface of the sixth lens is -5.853 mm.

The distance D12 from the image-side optical surface of the first lens to the object-side optical surface of the second lens on the optical axis is 0.049mm, and the distance D12 from the image-side optical surface of the second lens to the object-side optical surface of the third lens on the optical axis The surface distance D23 is 0.212mm, the distance D45 from the image-side optical surface of the fourth lens to the object-side optical surface of the fifth lens on the optical axis is 0.027mm, and the entrance pupil diameter EPD of the six-piece imaging lens group is 1.575 mm, the sum of thickness Σ(CT) of the center of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens is 2.25mm, the focal length f1 of the first lens is 2.764mm, the second The focal length f2 of the lens is -3.357mm, the focal length f3 of the third lens is 4.990mm, the focal length f4 of the fourth lens is 2.662mm, the focal length f5 of the fifth lens is 4.163mm, and the focal length f6 of the sixth lens is -1.452mm. The Abbe number vd1 of the first lens was 55.7, and the Abbe number vd2 of the second lens was 22.4. TL/R1=2.170, D23/D45=7.834, OL/EPD=1.912, D12/f1=0.018, ΣCT/f=0.781, (R2-R3)/(R10+R11)=1.612, vd1-vd2=33.3, R5-R4=0.229.

[table seven] the fourth embodiment basic lens data

[Table 8] Aspherical coefficients of the fourth embodiment

optical surface 1 2 3 4 5 6 K -13.2419 4.3448 -1458.4591 -8.9951 -30.3943 -220.4710 A 0.2153 -0.0544 -0.0604 -0.2239 0.2178 0.0717 B -0.3292 0.6503 0.6973 1.2514 -0.9256 -0.1767 C 0.5586 -2.3760 -2.3997 -3.6853 1.3033 -0.3539 D. -1.3978 2.5652 2.8402 6.1942 0.2368 1.3091 E. 2.3592 -0.5125 -2.4414 -7.2625 -4.5375 -2.1437 f -1.8678 -0.5925 2.9884 5.6518 6.3633 1.7585 G -0.0262 0.0957 -1.9673 -2.0701 -2.7106 -0.5112 h 0.4940 0.0000 0.0000 0.0000 0.0000 0.0000 J 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 optical surface 7 8 9 10 11 12 K -0.0076 -3.8230 -16.9900 0.0000 0.0000 5.2264 A 0.2429 -0.2168 0.0809 0.1110 0.0505 -0.1551 B 0.3483 0.3644 0.0066 0.4563 -0.1235 0.1127

C -1.5665 -0.2156 -0.0047 -0.7547 0.1220 -0.0717 D. 3.4341 -0.4713 -0.1841 0.4464 -0.0519 0.0338 E. -4.2685 1.2666 0.1587 -0.1175 0.0105 -0.0101 f 2.9252 -1.0136 -0.0468 0.0116 -0.0008 0.0017 G -0.8708 0.2649 0.0046 0.0000 0.0000 -0.0001 h 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 J 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000

It can be known from the basic lens data in Table 7 and the aberration curve in FIG. 4B that the six-element imaging lens set provided by this embodiment has a good compensation effect on astigmatism, distortion and spherical aberration.

Please refer to FIG. 5A . FIG. 5A is a schematic diagram showing a six-piece imaging lens set according to a fifth embodiment of the present invention. As shown in FIG. 5A, the object-side optical surfaces and the image-side optical surfaces of the first lens 10 to the sixth lens 60 are all formed using the aspheric equation of formula (1), and their aspheric coefficients are shown in Table 10, and Its reference wavelength is d-line 587nm.

The optical data of the fifth embodiment is shown in Table 9, wherein the distance TL from the object-side optical surface of the first lens to the imaging surface on the optical axis is 3.837 mm, and the distance TL from the object-side optical surface of the first lens on the optical axis is 3.837 mm. The distance OL from the side optical surface to the image-side optical surface of the sixth lens is 2.757mm, the focal length f of the optical image capture lens is 2.589mm, the curvature radius R1 of the object-side optical surface of the first lens is 2.166mm, and the first lens The radius of curvature R2 of the image side optical surface of the second lens is -4.022mm, the curvature radius R3 of the object side optical surface of the second lens is 8.853mm, the curvature radius R4 of the image side optical surface of the second lens is 1.544mm, and the third lens The curvature radius R5 of the object-side optical surface is 1.795mm, the curvature radius R10 of the image-side optical surface of the fifth lens is -10.000mm, and the curvature radius R11 of the object-side optical surface of the sixth lens is -10.000mm.

The distance D12 from the image-side optical surface of the first lens to the object-side optical surface of the second lens on the optical axis is 0.072 mm, and the distance D12 from the image-side optical surface of the second lens to the object-side optical surface of the third lens on the optical axis The surface distance D23 is 0.167mm, the distance D45 from the image-side optical surface of the fourth lens to the object-side optical surface of the fifth lens on the optical axis is 0.027mm, and the entrance pupil diameter EPD of the six-piece imaging lens group is 1.413 mm, the total thickness Σ(CT) of the center of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens is 2.133mm, the focal length f1 of the first lens is 2.710mm, the second The focal length f2 of the lens is -2.960mm, the focal length f3 of the third lens is 4.221mm, the focal length f4 of the fourth lens is 2.342mm, the focal length f5 of the fifth lens is 3.977mm, and the focal length f6 of the sixth lens is -1.416mm. The Abbe number vd1 of the first lens was 55.7, and the Abbe number vd2 of the second lens was 22.4. TL/R1=1.772, D23/D45=6.166, OL/EPD=1.951, T12/f1=0.027, ΣCT/f=0.824, (R2-R3)/(R10+R11)=0.644, vd1-vd2=33.3, R5-R4=0.251.

[table nine] basic lens data of the fifth embodiment

[table ten] the aspherical surface coefficient of the fifth embodiment

optical surface 1 2 3 4 5 6 k -22.0632 17.5580 1458.4591 -10.8676 -30.3944 -220.4687 A 0.1951 -0.0479 -0.2009 -0.2739 0.2434 0.0341 B -0.4143 0.5917 1.5356 1.7377 -1.1689 -0.1008 C 0.5244 -2.3118 -6.5753 -5.8675 3.3869 0.1417

D. -1.3090 2.7791 15.5715 11.4812 -7.0143 0.0242 E. 2.3783 -0.5925 -25.1751 -14.4173 8.3445 -0.9959 f -2.1717 0.0957 25.0681 10.7503 -4.7295 1.1653 G -0.5193 0.0000 -11.2183 -3.5975 0.9655 -0.3177 h 1.05190 0.0000 0.0000 0.0000 0.0000 0.0000 J 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 optical surface 7 8 9 10 11 12 k -0.1193 -3.5561 -16.9928 0.0000 0.0000 -4.7923 A 0.2814 -0.5438 -0.1873 -0.0459 0.1657 -0.1258 B 0.1567 1.3621 0.3715 0.5279 -0.2687 0.0578 C -1.2642 -2.4879 -0.2775 -0.7670 0.1990 -0.0222 D. 5.8939 3.3457 -0.0968 0.4464 -0.0743 0.0091 E. -10.9025 -2.0513 0.1643 -0.1175 0.0140 -0.0033 f 8.9396 0.2217 -0.0559 0.0116 -0.0011 0.0007 G -2.8109 0.1418 0.0061 0.0000 0.0000 -5.4609e-5 h 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 J 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000

It can be seen from the basic lens data in Table 9 and the aberration curve in FIG. 5B that the six-element imaging lens set provided by this embodiment has a good compensation effect on astigmatism, distortion and spherical aberration.

The above-described embodiments are only to illustrate the technical ideas and characteristics of the present invention, and its purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. The protection scope of the present invention should not be limited by the embodiments. That is, all equivalent changes or modifications made according to the spirit disclosed in the present invention shall still fall within the protection scope of the present invention.

Claims (18)

1. A six-piece imaging lens group, comprising: The optical image capture lens includes in sequence from the object side to the image side along the optical axis: A first lens, the first lens has a positive refractive power near the optical axis, and the image-side optical surface of the first lens is a convex surface near the optical axis; The second lens, the second lens has a negative refractive power near the optical axis, and the object side optical surface of the second lens is a convex surface near the optical axis, the object side optical surface of the second lens At least one of the optical surfaces on the image side and the image side is an aspheric surface; The third lens, the third lens has refractive power near the optical axis, and the image side optical surface of the third lens is concave near the optical axis, the object side optical surface of the third lens And at least one of the image-side optical surfaces is provided with at least one inflection point; A fourth lens, the fourth lens has a refractive power near the optical axis, and at least one of the object-side optical surface and the image-side optical surface of the fourth lens is an aspherical surface; The fifth lens, the image-side optical surface and the object-side optical surface of the fifth lens are convex surfaces near the optical axis, and at least one of the object-side optical surface and the image-side optical surface of the fifth lens is provided with has at least one inflection point; and The sixth lens, the image-side optical surface and the object-side optical surface of the sixth lens are concave near the optical axis, and at least one of the object-side optical surface and the image-side optical surface of the sixth lens is set have at least one inflection point; an imaging surface for imaging the subject; and a fixed aperture, arranged between the subject and the first lens, Wherein, the distance from the object-side optical surface of the first lens to the image-side optical surface of the sixth lens on the optical axis is OL, and the entrance pupil diameter of the six-piece imaging lens group is EPD, The distance from the image-side optical surface of the second lens to the object-side optical surface of the third lens on the optical axis is D23, and the distance from the image-side optical surface of the fourth lens to The distance to the object-side optical surface of the fifth lens is D45, and the OL, EPD, D23, and D45 satisfy the following relationship: 1.5<OL/EPD<2.5, 3.5<D23/D45<10, And the absolute value of the focal length of at least two lenses among the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens is less than 5mm. 2. The six-piece imaging lens group according to claim 1, wherein the Abbe number of the second lens is νd2, and the νd2 satisfies the following relational expression: vd2≤30. 3. The six-piece imaging lens group according to claim 1, wherein the distance from the object-side optical surface of the first lens to the imaging surface on the optical axis is TL, and the first lens The radius of curvature of the object-side optical surface is R1, and the TL and R1 satisfy the following relationship: 1<TL/R1<2.5. 4. The six-piece imaging lens group according to claim 1, wherein the distance from the image-side optical surface of the first lens to the object-side optical surface of the second lens on the optical axis is D12 , the focal length of the first lens is f1, and the D12 and f1 satisfy the following relationship: 0.015<D12/f1<0.04. 5. The six-piece imaging lens group according to claim 1, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the The sum of the central thicknesses of the sixth lens is Σ(CT), the focal length of the optical image capture lens is f, and the Σ(CT) and f satisfy the following relational formula: 0.6<Σ(CT)/f<1. 6. The six-piece imaging lens group according to claim 1, wherein the radius of curvature of the image-side optical surface of the first lens is R2, and the radius of curvature of the object-side optical surface of the second lens is R3, The radius of curvature of the image-side optical surface of the fifth lens is R10, the curvature radius of the object-side optical surface of the sixth lens is R11, and the R2, R3, R10, and R11 satisfy the following relationship: 0.3<(R2-R3)/(R10+R11)<2.5. 7. The six-piece imaging lens set according to claim 1, wherein the absolute value of the focal length of the first lens, the third lens or the sixth lens is less than 5mm. 8. The six-piece imaging lens set according to claim 1, wherein the fourth lens, the fifth lens and the sixth lens are all made of plastic. 9. A six-piece imaging lens group, comprising: The optical image capture lens includes in order from the object side to the image side along the optical axis: A first lens, the first lens has a positive refractive power near the optical axis, and the image-side optical surface of the first lens is a convex surface near the optical axis; The second lens, the second lens has a negative refractive power near the optical axis, and the object side optical surface of the second lens is a convex surface near the optical axis, the object side optical surface of the second lens At least one of the optical surfaces on the image side and the image side is an aspherical surface; The third lens, the third lens has refractive power near the optical axis, and the image side optical surface of the third lens is concave near the optical axis, the object side optical surface of the third lens And at least one of the image-side optical surfaces is provided with at least one inflection point; A fourth lens, the fourth lens has a refractive power near the optical axis, and at least one of the object-side optical surface and the image-side optical surface of the fourth lens is provided with at least one inflection point; The fifth lens, the fifth lens has positive refractive power near the optical axis, and the image-side optical surface and the object-side optical surface of the fifth lens are convex near the optical axis, the fifth lens At least one of the object-side optical surface and the image-side optical surface of the lens is provided with at least one inflection point; and A sixth lens, the sixth lens has a negative refractive power near the optical axis, and the image-side optical surface and the object-side optical surface of the sixth lens are concave near the optical axis, and the sixth lens At least one of the object-side optical surfaces and the image-side optical surfaces of the six lenses is provided with at least one inflection point; an imaging surface for imaging the subject; and fixed aperture, Wherein, the absolute value of the focal length of at least two lenses among the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens is less than 5mm , the radius of curvature of the image-side optical surface of the second lens is R4, the radius of curvature of the object-side optical surface of the third lens is R5, from the image-side optical surface of the second lens on the optical axis The distance to the object-side optical surface of the third lens is D23, and the distance from the image-side optical surface of the fourth lens to the object-side optical surface of the fifth lens on the optical axis is D45, so Said R4, R5, said D23, D45 satisfy the following relational formula: R5–R4<0.5mm, 3.5<D23/D45<10. 10. The six-piece imaging lens set according to claim 9, wherein the entrance pupil diameter of the six-piece imaging lens set is EPD, and the EPD satisfies the following relational expression: 1.2mm<EPD<2.0mm. 11. The six-piece imaging lens group according to claim 9, wherein the distance from the object-side optical surface of the first lens to the imaging surface on the optical axis is TL, and the first lens The radius of curvature of the object-side optical surface is R1, and the TL and R1 satisfy the following relationship: 1<TL/R1<2.5. 12. The six-piece imaging lens group according to claim 9, wherein the distance from the image-side optical surface of the first lens to the object-side optical surface of the second lens on the optical axis is D12 , the focal length of the first lens is f1, and the D12 and f1 satisfy the following relationship: 0.015<D12/f1<0.04. 13. The six-piece imaging lens group according to claim 9, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the The sum of the central thicknesses of the sixth lens is Σ(CT), the focal length of the optical image capture lens is f, and the Σ(CT) and f satisfy the following relational formula: 0.6<Σ(CT)/f<1. 14. The six-piece imaging lens group according to claim 9, wherein the radius of curvature of the image-side optical surface of the first lens is R2, and the curvature radius of the object-side optical surface of the second lens is R3, The radius of curvature of the image-side optical surface of the fifth lens is R10, the curvature radius of the object-side optical surface of the sixth lens is R11, and the R2, R3, R10, and R11 satisfy the following relationship: 0.3<(R2-R3)/(R10+R11)<2.5. 15. The six-piece imaging lens set according to claim 9, wherein the third lens has positive refractive power near the optical axis. 16. The six-piece imaging lens set according to claim 9, wherein the absolute value of the focal length of the first lens, the third lens or the sixth lens is less than 5mm. 17. The six-piece imaging lens group according to claim 9, wherein the Abbe number of the first lens is vd1, the Abbe number of the second lens is vd2, and the vd1 and vd2 satisfy the following relationship Mode: 25<vd1-vd2<35. 18. The six-piece imaging lens set according to claim 9, wherein the fixed aperture is disposed between the subject and the first lens.