CN213903928U

CN213903928U - Confocal wide-spectrum athermalization mirror with large relative aperture

Info

Publication number: CN213903928U
Application number: CN202022189399.6U
Authority: CN
Inventors: 葛琳琳; 王世先; 张瑞; 闫学纯; 熊文君; 于浈浈
Original assignee: Henan Costar Group Co Ltd
Current assignee: Henan Costar Group Co Ltd
Priority date: 2020-09-29
Filing date: 2020-09-29
Publication date: 2021-08-06
Anticipated expiration: 2030-09-29

Abstract

The utility model discloses a confocal wide spectrum of big relative aperture does not have thermalization objective from the object space to the image space, and objective group includes first lens, cemented lens, second lens, third lens, fourth lens, light filter (ICR) and imaging surface (IMA) in proper order, first lens are positive meniscus lens, cemented lens is formed by positive lens and negative lens veneer, the second lens is negative lens, the third lens is positive lens, the fourth lens is negative lens. The utility model has the characteristics of small, light in weight, low power dissipation etc, can realize observing round the clock, the function of aiming, can need not the focusing and satisfy the user demand of observing round the clock at-40 ℃ -50 ℃ wide temperature range.

Description

Confocal wide-spectrum athermalization mirror with large relative aperture

Technical Field

The utility model relates to an optical imaging equipment technical field specifically is a confocal wide spectrum of big relative aperture does not have thermalization objective.

Background

Night vision technology, which is a photoelectric technology for realizing night observation by means of a photoelectric imaging device, comprises two aspects of low-light night vision and infrared night vision, is also called image enhancement technology, and is a photoelectric imaging technology for enhancing a weak target image illuminated by night light through a night vision mirror with an image enhancement tube so as to be observed; a low-light level night vision device is a night vision device with the largest production capacity and equipment quantity and the widest application at present abroad, and can be divided into direct observation (such as a night vision observer, a weapon sight, a night driver and night vision glasses) and indirect observation (such as a low-light level television); in the field of night vision, along with the rapid development of low-illumination CCD detection devices in the domestic market, the low-illumination CCD detection devices are diversified, however, most of the low-illumination CCD detection devices are in the spectral range of 500-950 nm and the wide temperature range of-40-50 ℃, and the use requirements of day and night observation can be met only by focusing.

Disclosure of Invention

The utility model aims to overcome prior art's is not enough, provides one kind and uses refraction formula optical system as the design basis, chooses for use the confocal broad spectrum of big relative aperture that big relative aperture form effectively improves detector target surface response illuminance to have a thermalization objective.

In order to achieve the above design purpose, the utility model adopts the following technical scheme: the large-relative-aperture confocal wide-spectrum athermalized objective lens sequentially comprises a first lens, a cemented lens, a second lens, a third lens, a fourth lens, an optical filter (ICR) and an imaging surface (IMA) from an object side to an image side, wherein the first lens is a positive meniscus lens, the cemented lens is formed by cementing a positive lens and a negative lens, the second lens is a negative lens, the third lens is a positive lens, and the fourth lens is a negative lens.

The mirror surfaces of the first lens, the cemented lens, the second lens, the third lens and the fourth lens are all spherical surfaces.

The objective lens group structure adopts a Petzval structure deformation form, and the number of matched pixels of the objective lens group structure is 800 multiplied by 600 of low-illumination CCD with the pixel size of 18 um.

The focal length of the objective lens group is 48, and the relative aperture is 1: 1.25, field of view 20.4 °.

The utility model discloses beneficial effect: this novel deformation structure of selecting for use petzval objective is become by six lenses, its mirror surface is the sphere, the deformation form of petzval objective is adopted to the structure of this lens group, petzval objective structure economical and practical has the characteristics of big relative aperture, the shortcoming of petzval objective has inside field curvature, therefore the fourth lens is negative lens (field flattening field lens), be favorable to the correction of field curvature, in addition, the cemented lens in this structure is favorable to correcting colour difference and second grade spectrum, on the basis of analysis second grade spectrum, optimize when preferred optical system structural style and select reasonable glass material, to the optimal design of colour difference, distortion aberration, effectively improve objective system's image quality. The utility model has the characteristics of small, light in weight, low power dissipation etc, can realize observing round the clock, the function of aiming, can need not the focusing and satisfy the user demand of observing round the clock at-40 ℃ -50 ℃ wide temperature range.

Drawings

FIG. 1 is a view showing the arrangement of the optical glass with light according to the present invention;

FIG. 2 is a spot diagram of the present invention at normal temperature of 20 ℃;

FIG. 3 is a spot diagram of the present invention at a low temperature of-40 ℃;

FIG. 4 is a spot diagram of the present invention at normal temperature of 5 deg.C;

FIG. 5 is a spot diagram of the present invention at a high temperature of 50 ℃;

FIG. 6 is a MTF chart of the present invention at normal temperature of 20 deg.C;

FIG. 7 is a MTF chart at-40 ℃ of the present invention;

FIG. 8 is a MTF chart of the present invention at room temperature of 5 deg.C;

FIG. 9 is a MTF diagram of the present invention at a high temperature of 50 ℃.

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings. As shown in fig. 1-9: the large-relative-aperture confocal wide-spectrum athermalized objective lens comprises a first lens 1, a cemented lens 2, a second lens 3, a third lens 4, a fourth lens 5, an optical filter (ICR) 6 and an imaging surface (IMA) 7 from an object side to an image side in sequence, wherein the first lens 1 is a positive meniscus lens, the cemented lens 2 is formed by cementing a positive lens and a negative lens, the second lens 3 is a negative lens, the third lens 4 is a positive lens, and the fourth lens 5 is a negative lens.

The mirror surfaces of the first lens 1, the cemented lens 2, the second lens 3, the third lens 4 and the fourth lens 5 are all spherical.

Claims

1. The utility model provides a confocal wide spectrum of big relative aperture does not have thermalization objective which characterized in that: from the object space to the image space, the objective lens group sequentially comprises a first lens, a cemented lens, a second lens, a third lens, a fourth lens, an optical filter and an imaging surface, the first lens is a positive meniscus lens, the cemented lens is formed by the positive lens and the negative lens through cementing, the second lens is a negative lens, the third lens is a positive lens, and the fourth lens is a negative lens.

2. The large relative aperture confocal wide-spectrum athermalized objective lens of claim 1, wherein: the mirror surfaces of the first lens, the cemented lens, the second lens, the third lens and the fourth lens are all spherical surfaces.

3. The large relative aperture confocal wide-spectrum athermalized objective lens of claim 1, wherein: the objective lens group structure adopts a Petzval structure deformation form, and the number of matched pixels of the objective lens group structure is 800 multiplied by 600 of low-illumination CCD with the pixel size of 18 um.

4. The large relative aperture confocal wide-spectrum athermalized objective lens of claim 1, wherein: the focal length of the objective lens group is 48, and the relative aperture is 1: 1.25, field of view 20.4 °.