CN211293432U

CN211293432U - Large-aperture large-view-field near-infrared lens

Info

Publication number: CN211293432U
Application number: CN202020062256.6U
Authority: CN
Inventors: 葛琳琳; 刘凯; 魏小平; 王世先; 张瑞; 闫学纯; 范淑静
Original assignee: Henan Costar Group Co Ltd
Current assignee: Henan Costar Group Co Ltd
Priority date: 2020-01-13
Filing date: 2020-01-13
Publication date: 2020-08-18
Anticipated expiration: 2030-01-13

Abstract

The utility model relates to a big visual field near infrared camera lens of large aperture, the optical path system of this camera lens includes from the thing side to the picture side in proper order, first falcate negative lens, second falcate negative lens, first positive lens, aperture diaphragm, the positive lens of second, biconcave negative lens, the positive lens of third, the positive lens of fourth, and each lens glass is white light glass, coating film to near infrared wave band. The lens is a wide-angle lens with near-infrared waveband, has excellent imaging quality in the whole view field range, can be used at night in the daytime, is convenient for safety monitoring on a large scale, has short total length of the system and light weight, is easy to integrate into other equipment, is simple and convenient to assemble, and is easy to realize mass production.

Description

Large-aperture large-view-field near-infrared lens

Technical Field

The utility model belongs to the technical field of optical design, concretely relates to big visual field near-infrared camera lens of large aperture.

Background

The technology has become more and more widely used in recent years. The large-aperture large-visual-field near-infrared lens has the characteristics of light weight and small size, can realize day and night observation, and has an application range which is continuously expanded along with the continuous reduction of cost, such as security, industry, vehicle-mounted lenses and the like. Grant notice No. CN 207216121U grant notice day 2018.04.10 discloses a large aperture wide angle long wave infrared fixed focus lens, which has five lenses in sequence from the object space to the image space, including: the first lens with negative focal power is a meniscus germanium negative lens with a convex surface facing to an object space; the second lens with negative focal power is a meniscus germanium negative lens with a convex surface facing the object space; a third lens with positive focal power, a meniscus germanium positive lens with the convex surface facing the object space; the fourth lens with negative focal power is a meniscus germanium negative lens with a convex surface facing the image space; the fifth lens with positive focal power is a meniscus germanium positive lens with a convex surface facing the image space. The large-aperture wide-angle long-wave infrared prime lens has the F number of 1.0, is suitable for a long-wave uncooled detector with the pixel size of 640x480 and the pixel size of 17 mu m, and has strict requirements on optical glass.

The refraction type optical structure is used, the reflector does not need to be adjusted, the assembly is simple and convenient, and the mass production is easy. The lens is a wide-angle lens with near-infrared waveband, has excellent imaging quality in the whole view field range, can be used at night in the daytime, is convenient for large-scale safety monitoring, has short total length and light weight, is easy to integrate into other equipment, and has good application prospect.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects in the prior art, the present invention provides a large-aperture and large-field near-infrared lens, which has a focal length of 6mm, a total optical length of 36.83mm, an F number of 1.4, an adaptive 1/1.7 "CCD (768 × 576 pixels), a wavelength band of 480-. The lens system has the advantages of short total length and light weight, and is easy to integrate into other equipment.

In order to achieve the above purpose, the utility model adopts the technical scheme that: this big visual field near-infrared camera lens of large aperture, its characterized in that: the optical path system of the lens sequentially comprises a first negative meniscus lens, a second negative meniscus lens, a first positive lens, an aperture diaphragm, a second positive lens, a double-concave negative lens, a third positive lens and a fourth positive lens from the object side to the image side, wherein all lens glasses are white glass and are coated to a near infrared waveband.

The lens parameters are as follows: the focal length of the lens is 6mm, the total optical length is 36.83mm, the F number is 1.4, the CCD is matched with the image surface size of 1/1.7 and the pixel size is 768 multiplied by 576, the wave band is 480-: 64.7 ° x 50.8 °.

And one side of the first meniscus negative lens object side is plated with a hard film.

The lens parameters are as follows:

adopt the utility model discloses technical scheme's beneficial effect: the utility model discloses a total seven lenses of camera lens and aperture diaphragm are constituteed, use refraction formula optical structure, need not to adjust the speculum, and the assembly is simple and convenient, easily volume production. The lens is a wide-angle lens with near-infrared waveband, has excellent imaging quality in the whole view field range, can be used at night in the daytime, is convenient for large-scale safety monitoring, has short total length and light weight, is easy to integrate into other equipment, and has good application prospect.

Drawings

The following describes in detail embodiments of the present invention with reference to the accompanying drawings.

FIG. 1 is a diagram of an optical system of the present invention,

figure 2 is a graph of the optical transfer function,

figure 3 is a diagram of an optical spot array,

fig. 4 shows optical curvature of field and distortion.

Detailed Description

The example is that the utility model discloses be applied to big relative aperture big visual field near-infrared CCD camera lens, image plane size 1/1.7 ", pixel 768 x 576.

As shown in fig. 1, the large-aperture large-field-of-view near-infrared lens includes, in order from an object side to an image side, a first negative meniscus lens 1, a second negative meniscus lens 2, a first positive lens 3, an aperture stop 4, a second positive lens 5, a double-concave negative lens 6, a third positive lens 7, and a fourth positive lens 8. All the lens glasses are white glass and are coated to a near infrared band. One side of the first falcate negative lens object side is plated with a hard film.

The lens satisfies the following parameters: the focal length of the lens is 6mm, the total optical length is 36.83mm, the F number is 1.4, the CCD 9 is adapted to the image surface size of 1/1.7, the pixel is 768 multiplied by 576, the wave band is 480-: 64.7 ° x 50.8 °.

The lens parameters are as follows:

the effects of the present invention will be described in further detail below with reference to an aberration analysis chart.

The aberration analysis chart of the large-aperture large-field-of-view near-infrared lens shown in fig. 1 is that fig. 2 is an optical transfer function chart, fig. 3 is an optical point diagram, and fig. 4 is optical field curvature and distortion.

It can be found from the figure that various aberrations of each focal segment are well corrected, the diffuse speckles are all corrected to be close to the size of the Airy spots, the MTF is close to the diffraction limit, and the distortion is less than 70%.

Therefore, the utility model provides an infrared tight shot of large aperture wide angle long wave has good imaging quality.

Finally, it should be noted that: the above embodiments are only used to illustrate the present invention and do not limit the technical solutions described in the present invention. Therefore, although the present invention has been described in detail with reference to the above embodiments, it will be understood by those skilled in the art that the present invention may be modified and equivalents may be substituted; all such modifications and variations are intended to be included herein within the scope of this disclosure and the present invention and within the scope of the following claims.

Claims

1. A large-aperture and large-field near-infrared lens is characterized in that: the optical path system of the lens sequentially comprises a first negative meniscus lens, a second negative meniscus lens, a first positive lens, an aperture diaphragm, a second positive lens, a double-concave negative lens, a third positive lens and a fourth positive lens from an object side to an image side, wherein all lens glasses are white glass and are coated to a near infrared waveband; the lens satisfies the following parameters: the focal length of the lens is 6mm, the total optical length is 36.83mm, the F number is 1.4, the CCD is matched with the image surface size of 1/1.7 and the pixel size is 768 multiplied by 576, the wave band is 480-: 64.7 ° x 50.8 °.

2. The large-aperture large-field near-infrared lens of claim 1, characterized in that: and one side of the first meniscus negative lens object side is plated with a hard film.

3. The large-aperture large-field near-infrared lens of claim 1, characterized in that: the lens parameters are as follows:

。