CN109143547B

CN109143547B - Wide-spectrum lens

Info

Publication number: CN109143547B
Application number: CN201811042622.5A
Authority: CN
Inventors: 韩琦琦; 刘剑峰; 刘川; 胡贵军
Original assignee: Beijing Dianzhen Hongguang Photoelectric Technology Co ltd
Current assignee: Beijing Dianzhen Hongguang Photoelectric Technology Co ltd
Priority date: 2018-09-07
Filing date: 2018-09-07
Publication date: 2020-11-20
Anticipated expiration: 2038-09-07
Also published as: CN109143547A

Abstract

The invention discloses a wide spectrum lens with a spectrum waveband range of 400nm-1100nm, which is used for solving the detection requirement of a wider waveband. The lens comprises three groups of four optical lenses, a first lens of the wide spectrum lens is a meniscus lens with two different curvature radiuses, a second lens is a biconvex lens with two different curvature radiuses, a large surface of the first lens is glued with a large surface of the second lens into a group, a third lens is a biconcave lens with two same curvature radiuses, the third lens is positioned on one side of a small surface of the second lens, a fourth lens is a plano-convex lens, the fourth lens is positioned on the other side of the third lens relative to the second lens, the plano-mirror surface of the fourth lens is opposite to the third lens, the clear aperture of the lens is 12.5mm, the focal length is 200mm, the F number of the lens is 16, the distortion is less than 0.2%, and the imaging effect is close to the diffraction limit.

Description

Wide-spectrum lens

Technical Field

The invention belongs to the technical field of optical imaging.

Background

The lens is an important device for optical imaging mainly made of optical glass, and various optical glass materials are used, such as H-K9L, H-FK61 and H-LAK12 which are common optical materials in the field, and symbols represent specific optical material marks, for example, H-FK61 is a low-dispersion fluorophosphate optical glass mark.

In the microscope, the lens is matched with the objective lens for use, collimated light beams output by the objective lens are imaged on the detector for the second time, and high-precision imaging is achieved. In order to obtain good imaging effect, the lens is required to eliminate various aberrations, wherein chromatic aberration is an important item. In the existing lens, the working wave band is 480nm-680nm of visible light wave band or 680nm-1100nm of partial visible light to near infrared wave band, but the requirement of the lens facing wider wave band such as 400nm-1100nm wave band range can not be satisfied.

Disclosure of Invention

The invention mainly aims to develop a wide-spectrum lens with a spectrum waveband range of 400nm-1100nm so as to meet the detection requirement of a wider waveband.

The invention relates to a wide-spectrum lens, which comprises three groups of four optical lenses, wherein a first lens (1) of the wide-spectrum lens is a meniscus lens with two surfaces with different curvature radiuses, a second lens (2) is a biconvex lens with two surfaces with different curvature radiuses, the surface with the larger curvature radius of the first lens (1) and the surface with the larger curvature radius of the second lens (2) are glued into a group, a third lens (3) is independently grouped, the third lens (3) is a biconcave lens with the same curvature radiuses, the third lens (3) is positioned on one side of the surface with the smaller curvature radius of the second lens (2), a fourth lens (4) is independently grouped, the fourth lens (4) is a plano-convex lens, the fourth lens (4) is positioned on the other side of the third lens (3) relative to the second lens (2), the plano-mirror surface of the fourth lens (4) is opposite to the third lens (3), and the clear aperture of the lens is 12.5mm, the focal length is 200 mm. The F number of the lens is 16, the distortion is less than 0.2%, the imaging effect is close to the diffraction limit, and the lens can work in a visible light wave band of 480nm-680nm or a part of visible light to near infrared wave band of 680nm-1100nm and can work in a wider wave band range of 400nm-1100 nm.

The surfaces of four optical lenses of the wide-spectrum lens can be separately, partially or completely plated with antireflection films with a wide spectrum range of 400nm-1100nm, so that the single-side transmittance is more than 99.5%, and the optical system transmittance is more than 95%.

The first lens (1) of the wide-spectrum lens is made of an optical material H-K9L, the center thickness is 4.0mm, the surface with the small curvature radius is a spherical surface, the curvature radius is 49.77mm, the surface with the large curvature radius is a spherical surface, the curvature radius is 149.975mm, the clear aperture is 17mm, and the focal length is 141.67 mm.

The second lens (2) of the wide-spectrum lens is made of an optical material H-FK61, the center thickness is 5.0mm, the surface with the large curvature radius is a spherical surface, the curvature radius is 149.975mm, the surface with the small curvature radius is a spherical surface, the curvature radius is 92.50mm, the clear aperture is 16mm, and the focal length is 115.57 mm.

The third lens (3) of the wide-spectrum lens is made of an optical material H-LAK12, the center thickness is 4.0mm, two surfaces are spherical surfaces, the curvature radius is 67.976mm, the clear aperture is 16mm, and the focal length is-48.00 mm.

The fourth lens (4) of the wide-spectrum lens is made of an optical material H-FK61, the center thickness is 4.0mm, the convex surface is spherical, the curvature radius is 56.525mm, the clear aperture is 17mm, and the focal length is 113.40 mm.

The distance between the lens centers of a second lens (2) and a third lens (3) of the wide-spectrum lens is 2.0mm, the distance between the lens centers of the third lens (3) and a fourth lens (4) of the wide-spectrum lens is 8.62mm, the wide-spectrum lens also comprises an image plane (5), the image plane (5) is positioned on the convex surface side of the fourth lens, and the distance between the image plane (5) and the lens center 185.84mm of the fourth lens (4).

The wide-spectrum lens is manufactured by adopting the optimized materials and the optimized parameters, and the optical lens of the lens is plated with the antireflection film, so that the chromatic aberration can be more effectively eliminated, and the imaging precision is higher.

Drawings

FIG. 1 is a diagram of an optical lens assembly of a wide-spectrum lens

FIG. 2 wide-spectrum lens imaging transfer function diagram

FIG. 3 is a diagram of wide-spectrum lens distortion

In the figure: 1. first lens 2, second lens 3, third lens 4, fourth lens 5, image plane

Detailed Description

The wide-spectrum infinity correction sleeve lens with the focal length of 200mm for the microscope comprises three groups of four optical lenses with the same center and an image plane (5), wherein the four optical lenses are as follows: the first lens (1) is made of an optical material H-K9L and is a meniscus lens with two different curvature radii, the surface with the small curvature radius is a spherical surface with the curvature radius of 49.77mm, the surface with the large curvature radius is a spherical surface with the curvature radius of 149.975mm, the focal length is 141.67mm, the central thickness is 4.0mm, and the clear aperture is 17 mm; the second lens (2) is made of an optical material H-FK61 and is a biconvex lens with two different curvature radiuses, the surface with the large curvature radius is a spherical surface with the curvature radius of 149.975mm, the surface with the small curvature radius is a spherical surface with the curvature radius of 92.50mm, the focal length is 115.57mm, the central thickness is 5.0mm, and the clear aperture is 16 mm; the surface with large curvature radius of the first lens (1) is glued with the surface with large curvature radius of the second lens (2) to form a group; the third lens (3) is independently a group, the third lens (3) is made of an optical material H-LAK12 and is a biconcave lens with two surfaces with the same curvature radius, the two surfaces are spherical surfaces with the curvature radius of 67.976mm, the focal length is-48.00 mm, the center thickness is 4.0mm, the clear aperture is 16mm, the third lens (3) is positioned on one side of the surface with the small curvature radius of the second lens (2), and the distance between the second lens (2) and the center of the third lens (3) is 2.0 mm; the fourth lens (4) is also a single group, the fourth lens (4) is made of an optical material H-FK61 and is a plano-convex lens, the convex surface is a spherical surface with the curvature radius of 56.525mm, the focal length is 113.40mm, the central thickness is 4.0mm, the clear aperture is 17mm, the fourth lens (4) is positioned on the other side of the third lens (3) relative to the second lens (2), the plano-convex surface of the fourth lens (4) is opposite to the third lens (3), and the lens central distance between the third lens (3) and the fourth lens (4) is 8.62 mm; the image surface (5) is positioned on the convex surface side of the fourth lens, and the image surface (5) is 185.84mm away from the lens center of the fourth lens (4). The surfaces of the four optical lenses are all plated with antireflection films with wide spectral ranges of 400nm-1100 nm. The manufactured wide-spectrum lens has the clear aperture of 12.5mm, the focal length of 200mm, the F number of the lens of 16, the distortion of less than 0.2 percent and the imaging effect close to the diffraction limit.

Claims

1. A wide-spectrum lens, characterized by: the wide-spectrum lens consists of three groups of four optical lenses, a first lens (1) is a meniscus lens with two different absolute values of curvature radius, a second lens (2) is a biconvex lens with two different absolute values of curvature radius, the surface with large curvature radius of the first lens (1) and the surface with large curvature radius of the second lens (2) are glued into a group, a third lens (3) is independently grouped, a third lens (3) is a biconcave lens with two same absolute values of curvature radius, the third lens (3) is positioned on one side of the surface with small curvature radius of the second lens (2), a fourth lens (4) is independently grouped, the fourth lens (4) is a plano-convex lens, the fourth lens (4) is positioned on the other side of the third lens (3) relative to the second lens (2), the plano-mirror surface of the fourth lens (4) is opposite to the third lens (3), and the clear aperture of the lens is 12.5mm, the focal length is 200mm, and the focal length is 200mm,

the first lens (1) is made of an optical material H-K9L, the center thickness is 4.0mm, the surface with a small curvature radius is a spherical surface, the curvature radius is +49.77mm, the surface with a large curvature radius is a spherical surface, the curvature radius is +149.975mm, the clear aperture is 17mm, and the focal length is 141.67 mm;

the second lens (2) is made of an optical material H-FK61, the center thickness is 5.0mm, the surface with the large curvature radius is a spherical surface, the curvature radius is +149.975mm, the surface with the small curvature radius is a spherical surface, the curvature radius is-92.50 mm, the clear aperture is 16mm, and the focal length is 115.57 mm;

the third lens (3) is made of an optical material H-LAK12, the center thickness is 4.0mm, two surfaces are spherical surfaces, the curvature radius of one side close to the first lens (1) is-67.976 mm, the curvature radius of one side close to an image surface is +67.976mm, the clear aperture is 16mm, and the focal length is-48.00 mm;

the fourth lens (4) is made of an optical material H-FK61, the center thickness is 4.0mm, the convex surface is a spherical surface, one side close to the first lens (1) is a plane, the curvature radius of one side close to the image surface is-56.525 mm, the clear aperture is 17mm, and the focal length is 113.40 mm.

2. The wide-spectrum lens of claim 1, wherein: the surfaces of part or all of the first lens (1), the second lens (2), the third lens (3) and the fourth lens (4) of the four optical lenses are plated with antireflection films with a wide spectrum range of 400nm-1100 nm.

3. The wide-spectrum lens of claim 1 or 2, wherein: the distance between the lens centers of the second lens (2) and the third lens (3) is 2.0mm, the distance between the lens centers of the third lens (3) and the fourth lens (4) is 8.62mm, the image plane is located on the convex surface side of the fourth lens, and the distance between the image plane and the lens center of the fourth lens (4) is 185.84 mm.