CN111399187A - A high-pixel low-distortion optical lens - Google Patents

Abstract

The invention belongs to the field of optical imaging, and particularly relates to a high-pixel low-distortion optical lens which comprises an optical module, wherein the optical module is sequentially provided with a front group S1 with negative focal power, a middle group S2 with positive focal power, a diaphragm and a focusing group S3 with positive focal power from an object space to an image space; the focal length of the optical module is f, the focal length of the front group is fS1, the focal length of the middle group is fS2, the focal length of the focusing group is fS3, and the relationship is satisfied: 1.20<|fS1/f|<1.60，1.20<|fS2/f|<1.60，1.20<|fS3/f|<1.60. The optical module with the focal length of 16mm is realized through the structure, the F number of an image space is 2.8, and the maximum imaging surface is

The highest resolution can reach 200lp/mm, can match with a 2.5 mu m pixel chip, and the maximum optical distortion of the whole visual field is lower than 1.0 percent.

Description

A high-pixel low-distortion optical lens

technical field

The invention belongs to the technical field of optical imaging, and in particular relates to a high-pixel low-distortion optical lens.

Background technique

With the rise of modern industry, the application of optical lens is more and more extensive, especially in the field of inspection applications, such as: dimension measurement, pin positioning, PCB board defect detection, floor tile surface texture and color detection and other applications. With the continuous improvement of application requirements, the requirements for optical lenses are also getting higher and higher, especially in terms of field of view, optical distortion, resolution, etc. At the same time, the pixels of camera chips tend to be larger, and 20 million pixel 1.1″ chips are currently One of the mainstream chips.

However, there are few optical lenses designed for 1.1" chips in China, and the distortion and lens size are insufficient, especially the imaging at a relatively short distance. Therefore, the research and development of high-pixel and low-distortion optical lenses is even more difficult. for urgency.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a high-pixel and low-distortion optical lens, which is suitable for a 1.1" camera chip and meets application requirements, aiming at the deficiencies of the prior art.

In order to achieve the above object, the present invention adopts the following technical solutions:

A high-pixel low-distortion optical lens, comprising an optical module, the optical module is sequentially provided with a front group S1 of negative refractive power, a middle group S2 of positive refractive power, a diaphragm and a positive refractive power from the object side to the image side degree focusing group S3;

The front group S1 includes a first lens G1 with a positive refractive power and a meniscus structure, a second lens G2 with a negative refractive power and a meniscus structure, and a third lens G3 with a negative refractive power and a meniscus structure;

The middle group S2 includes a fourth lens G4 with negative refractive power and a double concave structure, a fifth lens G5 with positive refractive power and a double convex structure, a sixth lens G6 with negative refractive power and a meniscus structure, and a positive refractive power and the seventh lens G7 with a biconvex structure; wherein, the fourth lens G4 and the fifth lens G5 are cemented to form the first cemented lens group U1 with negative refractive power, and the sixth lens G6 and the seventh lens G7 are cemented to form a positive refractive power degree of the second cemented lens group U2;

The focusing group includes an eighth lens G8 with a positive refractive power and a meniscus structure, a ninth lens G9 with a negative refractive power and a meniscus structure, a tenth lens G10 with a negative refractive power and a biconcave structure, and a positive refractive power. and the eleventh lens G11 of biconvex structure and the twelfth lens G12 of positive refractive power and biconvex structure; wherein, the eighth lens G8 and the ninth lens G9 are cemented into a third cemented lens with negative refractive power Group U3; the tenth lens G10 and the eleventh lens G11 are cemented into a fourth cemented lens group U4 with positive refractive power;

The focal length of the optical module is f, the focal length of the front group is fS1, the focal length of the middle group is fS2, and the focal length of the focusing group is fS3, which satisfy the relationship: 1.20<|fS1/f| <1.60, 1.20<|fS2/f|<1.60, 1.20<|fS3/f|<1.60.

As an improvement of the high-pixel low-distortion optical lens of the present invention, the optical back focal length BFL of the optical module and the focal length f of the optical module satisfy the relationship: |BFL/f|<1.50.

As an improvement of the high-pixel low-distortion optical lens of the present invention, the half image height y' of the optical module and the focal length f of the optical module satisfy the relationship: |y'/f|<0.7.

As an improvement of the high-pixel low-distortion optical lens of the present invention, the focal length of the first lens G1 is fG1, and the ratio of the focal length fG1 to the focal length f of the optical module satisfies the relationship: 2.80<|fG1 /f|<3.20; the focal length of the second lens G2 is fG2, and the ratio of the focal length fG2 to the focal length f of the optical module satisfies the relationship: 1.20<|fG2/f|<1.80; the third lens The focal length of G3 is fG3, and the ratio of the focal length fG3 to the focal length f of the optical module satisfies the relationship: 1.80<|fG3/f|<2.20.

As an improvement of the high-pixel low-distortion optical lens of the present invention, the focal length of the first cemented lens group is fU1, and the ratio of the focal length fU1 to the focal length f of the optical module satisfies the relationship: 6.50<| fU1/f|<7.00.

As an improvement of the high-pixel low-distortion optical lens of the present invention, the focal length of the second cemented lens group is fU2, and the ratio of the focal length fU2 to the focal length f of the optical module satisfies the relationship: 1.00<| fU2/f|<1.50.

As an improvement of the high-pixel low-distortion optical lens of the present invention, the focal length of the third cemented lens group is fU3, and the ratio of the focal length fU3 to the focal length f of the optical module satisfies the relationship: 5.60<| fU3/f|<6.40.

As an improvement of the high-pixel low-distortion optical lens of the present invention, the focal length of the fourth cemented lens group is fU4, and the ratio of the focal length fU4 to the focal length f of the optical module satisfies the relationship: 52.00< |fU4/f|<56.00.

As an improvement of the high-pixel low-distortion optical lens of the present invention, the focal length of the twelfth lens G12 is fG12, and the ratio of the focal length fG12 to the focal length f of the optical module satisfies the relationship: 1.20<|fG12/ f|<1.60.

As an improvement of the high-pixel low-distortion optical lens of the present invention, each lens is a spherical mirror, the diaphragm is an aperture diaphragm, and the diaphragm of the diaphragm can be in the range of F2.8-F16. tune.

最高分辨率可达200lp/mm，可匹配2.5μm像元芯片，用于1.1″芯片时，其像素可达到两千三百万像素，全视场最大光学畸变低于1.0％；而且本发明采用浮动对焦的调焦方式，其通光孔径也可灵活调节。Compared with the prior art, the beneficial effects of the present invention include, but are not limited to: the present invention provides a high-pixel low-distortion optical lens, including an optical module, and the optical module is sequentially provided with negative light from the object side to the image side. The front group S1 of the power, the middle group S2 of the positive power, the diaphragm and the focusing group S3 of the positive power; the front group S1 includes the first lens G1 of the positive power and the meniscus structure, and the negative power And the second lens G2 of meniscus structure and the third lens G3 of negative refractive power and meniscus structure; the middle group S2 includes the fourth lens G4 of negative refractive power and double concave structure, positive refractive power and double convexity The fifth lens G5 of the structure, the sixth lens G6 of negative refractive power and meniscus structure, and the seventh lens G7 of positive refractive power and biconvex structure; wherein, the fourth lens G4 and the fifth lens G5 are cemented to have negative light The first cemented lens group U1 of power, the sixth lens G6 and the seventh lens G7 are cemented into a second cemented lens group U2 with positive refractive power; the focusing group includes the eighth lens with positive refractive power and meniscus structure G8, the ninth lens G9 with negative power and meniscus structure, the tenth lens G10 with negative power and double concave structure, the eleventh lens G11 with positive power and double convex structure, and the positive power and double convex structure The twelfth lens G12 of the structure; wherein, the eighth lens G8 and the ninth lens G9 are cemented to form a third cemented lens group U3 with negative refractive power; the tenth lens G10 and the eleventh lens G11 are cemented to form The fourth cemented lens group U4 with positive refractive power; the focal length of the optical module is f, the focal length of the front group is fS1, the focal length of the middle group is fS2, and the focal length of the focusing group is fS3, It satisfies the relational expressions: 1.20<|fS1/f|<1.60, 1.20<|fS2/f|<1.60, 1.20<|fS3/f|<1.60. Through the above structure, the present invention realizes an optical module with a focal length of 16 mm, an image square F number of 2.8, and a maximum imaging surface of

The highest resolution can reach 200lp/mm, which can match the 2.5μm pixel chip. When used in a 1.1″ chip, its pixels can reach 23 million pixels, and the maximum optical distortion of the entire field of view is less than 1.0%; and the present invention adopts The focusing method of floating focus, its clear aperture can also be flexibly adjusted.

Description of drawings

FIG. 1 is a schematic structural diagram of an optical module in the present invention.

FIG. 2 is an optical distortion curve diagram of the optical module in the present invention.

Detailed ways

As used in the specification and claims, certain terms are used to refer to particular components. It should be understood by those skilled in the art that hardware manufacturers may refer to the same component by different nouns. The description and claims do not use the difference in name as a way to distinguish components, but use the difference in function of the components as a criterion for distinguishing. As mentioned in the entire specification and claims, "comprising" is an open-ended term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range, and basically achieve the technical effect.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", horizontal" etc. is based on the accompanying drawings The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a reference to the present invention. limits.

In the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrally connected; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or the internal communication between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

The present invention will be described in further detail below in conjunction with the accompanying drawings, but it is not intended to limit the present invention.

As shown in FIG. 1 , the present embodiment provides a high-pixel low-distortion optical lens, including an optical module. The optical module is sequentially provided with a front group S1 of negative refractive power and a middle optical module of positive refractive power from the object side to the image side. Group S2, diaphragm and focusing group S3 of positive power;

The front group S1 includes a first lens G1 with a positive refractive power and a meniscus structure, a second lens G2 with a negative refractive power and a meniscus structure, and a third lens G3 with a negative refractive power and a meniscus structure;

The middle group S2 includes a fourth lens G4 with negative power and a double-concave structure, a fifth lens G5 with positive power and a double-convex structure, a sixth lens G6 with negative power and a meniscus structure, and a positive power and double lens G6. The seventh lens G7 with a convex structure; wherein, the fourth lens G4 and the fifth lens G5 are cemented into a first cemented lens group U1 with negative refractive power, and the sixth lens G6 and the seventh lens G7 are cemented into a lens with positive refractive power. The second cemented lens group U2;

The focusing group includes the eighth lens G8 with positive power and meniscus structure, the ninth lens G9 with negative power and meniscus structure, the tenth lens G10 with negative power and double concave structure, positive power and double The eleventh lens G11 with a convex structure and the twelfth lens G12 with a positive refractive power and a biconvex structure; wherein, the eighth lens G8 and the ninth lens G9 are cemented into a third cemented lens group U3 with negative power; Ten lenses G10 and eleventh lenses G11 are cemented to form a fourth cemented lens group U4 with positive refractive power;

The focal length of the optical module is f, the focal length of the front group is fS1, the focal length of the middle group is fS2, and the focal length of the focusing group is fS3, which satisfy the relationship: 1.20<|fS1/f|<1.60, 1.20<|fS2/ f|<1.60, 1.20<|fS3/f|<1.60.

Further, the optical back focus BFL of the optical module and the focal length f of the optical module satisfy the relational formula: |BFL/f|<1.50.

Further, the half image height y' of the optical module and the focal length f of the optical module satisfy the relational expression: |y'/f|<0.7.

Further, the focal length of a lens G1 is fG1, and the ratio of its focal length fG1 to the focal length f of the optical module satisfies the relationship: 2.80<|fG1/f|<3.20; the focal length of the second lens G2 is fG2, and its focal length fG2 is equal to The ratio of the focal length f of the optical module satisfies the relationship: 1.20<|fG2/f|<1.80; the focal length of the third lens G3 is fG3, and the ratio of the focal length fG3 to the focal length f of the optical module satisfies the relationship: 1.80<| fG3/f|<2.20.

Further, the focal length of the first cemented lens group is fU1, and the ratio of the focal length fU1 to the focal length f of the optical module satisfies the relationship: 6.50<|fU1/f|<7.00.

Further, the focal length of the second cemented lens group is fU2, and the ratio of the focal length fU2 to the focal length f of the optical module satisfies the relationship: 1.00<|fU2/f|<1.50.

Further, the focal length of the third cemented lens group is fU3, and the ratio of the focal length fU3 to the focal length f of the optical module satisfies the relationship: 5.60<|fU3/f|<6.40.

Further, the focal length of the fourth cemented lens group is fU4, and the ratio of the focal length fU4 to the focal length f of the optical module satisfies the relationship: 52.00<|fU4/f|<56.00.

Further, the focal length of the twelfth lens G12 is fG12, and the ratio of the focal length fG12 to the focal length f of the optical module satisfies the relationship: 1.20<|fG12/f|<1.60.

Further, each lens is a spherical mirror, the diaphragm is an aperture diaphragm, and the aperture of the diaphragm is adjustable within the range of F2.8-F16.

In this example, the optical module data is as follows:

In this example, the focal length f of the optical module is 16mm, the maximum aperture is F#=2.8, the focal length f S1 =-22.9mm of the front group S1, the focal length f _S2 =21.38mm of the middle group _S2 , and the focal length f of the focusing group _S3 = 23.8mm. Optical back focus BFL=17.3mm, half image height y'=8.8mm. The focal length of the first lens G1 is f _G1 =48.6mm, the focal length of the second lens G2 is f _G2 =-24.0mm, the focal length of the third lens G3 is f _G3 =-33.8mm, and the focal length of the first cemented lens group is f _U1 =-108.5mm, the focal length of the second cemented lens group f _U2 =-21.9mm, the focal length of the third cemented lens group is f _U3 =-98.1mm, the focal length of the fourth cemented lens group is f _U4 =868.1mm, The focal length of the twelfth lens G12 is f _G12 =23.6 mm.

Each relationship:

|f _S1 /f|=1.43; |f _S2 /f|=1.33; |f _S3 /f|=1.49;

|BFL/f|=1.08; |y'/f|=0.55; |f _G1 /f|=3.03; |f _G2 /f|=1.50;

|f _G3 /f|=2.11; |f _U1 /f|=1.47; |f _U2 /f|=6.78; |f _U3 /f|=1.37;

|f _U4 /f|=6.13; |f _G12 /f|=54.26;

Satisfy the relation:

1.20<|f _S1 /f|<1.60;1.20<|f _S2 /f|<1.60;

1.20<|f _S3 /f|<1.60;|BFL/f|＜1.50;|y'/f|＜0.7;

2.80＜|f _G1 /f|＜3.20; 1.20＜|f _G2 /f|＜1.80;

1.80＜|f _G3 /f|＜2.20; 6.50＜|f _U1 /f|＜7.00;

1.00＜|f _U2 /f|＜1.50; 5.60＜|f _U3 /f|＜6.40;

52.00<|f _U4 /f|<56.00;1.20<|f _G12 /f|<1.60.

FIG. 2 shows the optical distortion curve diagram of the present embodiment, and the maximum optical distortion in the entire field of view is less than 1.0%.

最高分辨率可达200lp/mm，可匹配2.5μm像元芯片，对应的1.1″芯片时，其像素可达到两千三百万像素，全视场最大光学畸变低于1.0％；另外，采用浮动对焦的调焦方式，其通光孔径也可灵活调节。Through the above structure, an optical module with a focal length of 16mm is realized, the F-number of the image square is 2.8, and the maximum imaging surface is

The highest resolution can reach 200lp/mm, which can match the 2.5μm pixel chip. When the corresponding 1.1″ chip, its pixels can reach 23 million pixels, and the maximum optical distortion of the whole field of view is less than 1.0%; The focusing method of focusing, its clear aperture can also be flexibly adjusted.

The foregoing description shows and describes several preferred embodiments of the present invention, but as previously mentioned, it should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as an exclusion of other embodiments, but may be used in various and other combinations, modifications and environments, and can be modified within the scope of the inventive concepts described herein, from the above teachings or from skill or knowledge in the relevant art. However, modifications and changes made by those skilled in the art do not depart from the spirit and scope of the present invention, and should all fall within the protection scope of the appended claims of the present invention.

Claims (10)

1. a high pixel low distortion optical lens, is characterized in that: comprise optical module, described optical module is successively provided with the front group S1 of negative refractive power, the middle group S2 of positive refractive power from the object side to the image side , diaphragm and focusing group S3 with positive refractive power; The front group S1 includes a first lens G1 with a positive refractive power and a meniscus structure, a second lens G2 with a negative refractive power and a meniscus structure, and a third lens G3 with a negative refractive power and a meniscus structure; The middle group S2 includes a fourth lens G4 with negative refractive power and a double concave structure, a fifth lens G5 with positive refractive power and a double convex structure, a sixth lens G6 with negative refractive power and a meniscus structure, and a positive refractive power and the seventh lens G7 with a biconvex structure; wherein, the fourth lens G4 and the fifth lens G5 are cemented to form the first cemented lens group U1 with negative refractive power, and the sixth lens G6 and the seventh lens G7 are cemented to form a positive refractive power degree of the second cemented lens group U2; The focusing group includes an eighth lens G8 with a positive refractive power and a meniscus structure, a ninth lens G9 with a negative refractive power and a meniscus structure, a tenth lens G10 with a negative refractive power and a biconcave structure, and a positive refractive power. and the eleventh lens G11 of biconvex structure and the twelfth lens G12 of positive refractive power and biconvex structure; wherein, the eighth lens G8 and the ninth lens G9 are cemented into a third cemented lens with negative refractive power Group U3; the tenth lens G10 and the eleventh lens G11 are cemented into a fourth cemented lens group U4 with positive refractive power; The focal length of the optical module is f, the focal length of the front group is fS1, the focal length of the middle group is fS2, and the focal length of the focusing group is fS3, which satisfy the relationship: 1.20<|fS1/f| <1.60, 1.20<|fS2/f|<1.60, 1.20<|fS3/f|<1.60. 2 . The high-pixel low-distortion optical lens according to claim 1 , wherein the optical back focal length BFL of the optical module and the focal length f of the optical module satisfy the relationship: |BFL/f|<1.50. 3 . 3. The high-pixel low-distortion optical lens according to claim 1, wherein the half-image height y' of the optical module and the focal length f of the optical module satisfy the relational expression: |y'/f|<0.7 . 4. The high-pixel low-distortion optical lens according to claim 1, wherein the focal length of the first lens G1 is fG1, and the ratio of the focal length fG1 to the focal length f of the optical module satisfies the relational formula: 2.80 <|fG1/f|<3.20; the focal length of the second lens G2 is fG2, and the ratio of the focal length fG2 to the focal length f of the optical module satisfies the relationship: 1.20<|fG2/f|<1.80; the The focal length of the third lens G3 is fG3, and the ratio of the focal length fG3 to the focal length f of the optical module satisfies the relationship: 1.80<|fG3/f|<2.20. 5. The high-pixel low-distortion optical lens according to claim 1, wherein the focal length of the first cemented lens group is fU1, and the ratio of the focal length fU1 to the focal length f of the optical module satisfies the relational formula: 6.50<|fU1/f|<7.00. 6. The high-pixel low-distortion optical lens according to claim 1, wherein the focal length of the second cemented lens group is fU2, and the ratio of the focal length fU2 to the focal length f of the optical module satisfies the relational formula: 1.00<|fU2/f|<1.50. 7. The high-pixel low-distortion optical lens according to claim 1, wherein the focal length of the third cemented lens group is fU3, and the ratio of the focal length fU3 to the focal length f of the optical module satisfies the relational formula: 5.60<|fU3/f|<6.40. 8. The high-pixel low-distortion optical lens according to claim 1, wherein the focal length of the fourth cemented lens group is fU4, and the ratio of the focal length fU4 to the focal length f of the optical module satisfies the relational expression : 52.00<|fU4/f|<56.00. 9. The high-pixel low-distortion optical lens according to claim 1, wherein the focal length of the twelfth lens G12 is fG12, and the ratio of the focal length fG12 to the focal length f of the optical module satisfies the relational formula: 1.20< |fG12/f|<1.60. 10 . The high-pixel low-distortion optical lens according to claim 1 , wherein each lens is a spherical mirror, the diaphragm is an aperture diaphragm, and the aperture of the diaphragm is between F2.8 and F16. 11 . adjustable within the range.

Images