CN213023733U

CN213023733U - Wide-spectrum confocal apochromatic objective lens

Info

Publication number: CN213023733U
Application number: CN202021068698.8U
Authority: CN
Inventors: 葛琳琳; 王世先; 张瑞; 闫学纯
Original assignee: Henan Costar Group Co Ltd
Current assignee: Henan Costar Group Co Ltd
Priority date: 2020-06-11
Filing date: 2020-06-11
Publication date: 2021-04-20
Anticipated expiration: 2030-06-11

Abstract

The utility model discloses a confocal apochromatic objective of broad spectrum, including the objective body, the objective body comprises first negative lens, the positive lens of second, the positive lens of third, fourth negative lens, fifth negative lens, the positive lens of sixth, the positive meniscus lens of seventh and sensitization chip, the third positive lens glues with the negative lens of fourth and is first cemented lens, the gluey second cemented lens that is of fifth negative lens and the positive lens of sixth. The utility model discloses simple structure, cost are with low costs, under spectral range 486nm-950nm condition, realize need not the focusing and satisfy the user demand of observing round the clock to can extensively be applicable to the use in a plurality of fields of security protection control, on-vehicle camera lens.

Description

Wide-spectrum confocal apochromatic objective lens

Technical Field

The utility model belongs to the technical field of optics, concretely relates to confocal apochromatic objective of wide spectrum.

Background

In recent years, with the rapid development of low-illumination (photosensitive chip) CCD detection devices in domestic markets, products formed by matching wide-spectrum, large relative aperture, low vignetting and near-infrared low-illumination objective lenses can meet the functions of convenience, high-quality observation and aiming at day and night without focusing under the advantages of small size, light weight and low power consumption. The spectral response curve of a low-illumination (photosensitive chip) CCD detector in the current market is wide, the spectral range is expanded from a visible light band to a near-infrared band, and the spectral design band also needs to be widened in optical design, so that system aberration, particularly chromatic aberration and secondary spectrum are difficult to correct, and the difficulty of optical design is increased.

At present, the focal length of most wide-spectrum mirrors in the market is distributed between dozens of millimeters and thousands of millimeters, the application fields are different, such as astronomy, aerospace, remote sensing, spectral analysis, monitoring and the like, and day and night non-confocal optical systems are mostly adopted. When the ambient illumination changes, for example, after the system is used in daytime, the system needs to be refocused when the system is used at night or under dark conditions such as a tunnel, and the operation is complicated.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's not enough, provide a confocal apochromatic objective of wide spectrum of big relative aperture visible light, near-infrared wave band.

In order to achieve the above design purpose, the utility model adopts the following technical scheme: the wide-spectrum confocal apochromatic objective lens comprises an objective lens body, wherein the objective lens body consists of a first negative lens, a second positive lens, a third positive lens, a fourth negative lens, a fifth negative lens, a sixth positive lens, a seventh positive meniscus lens and a photosensitive chip, the third positive lens and the fourth negative lens are glued to form a first cemented lens, and the fifth negative lens and the sixth positive lens are glued to form a second cemented lens.

The mirror surfaces of the first negative lens, the second positive lens, the first cemented lens, the second cemented lens and the seventh positive meniscus lens are all spherical.

And the third positive lens and the fourth negative lens in the first cemented lens and the fifth negative lens and the sixth positive lens in the second cemented lens are cemented by two cementing materials of H-ZK7 and H-FK61 respectively.

The objective body is designed for a confocal system, and the day and night use requirements can be met without focusing.

The structural form of the objective lens body is a double-Gaussian structure, and the structure is favorable for correcting vertical aberration.

The focal length of the objective lens body is 7.4, and the relative aperture is 1: 1.2, field of view 44 °, distortion-0.7%, and total system length 15.5 mm.

The utility model discloses the confocal apochromatic objective of wide spectrum's parameter as follows:

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。

the utility model discloses beneficial effect: the novel optical detector takes a refraction type optical system as a design basis, and effectively improves the response illumination of the target surface of the detector in a large relative aperture mode; starting from the analysis of the secondary spectrum theory, the method selects proper optical glass materials to combine the cemented lens for apochromatic design in the methods of apochromatic, apochromatic and achromatic diffraction of the diffractive optical element, evaluates the imaging quality of the objective lens by using the system optimization design result, selects a double-gauss structure form which consists of 7 pieces of glass, the mirror surfaces of all the lenses are spherical surfaces, optimizes and selects reasonable glass materials while optimizing the optical system structure form on the basis of analyzing the secondary spectrum, selects the glass materials H-ZK7 and H-FK61 in the two groups of cemented lenses in the objective lens, particularly optimizes and designs the apochromatic, the secondary spectrum and the distortion aberration of the objective lens system, and effectively improves the imaging quality of the objective lens system. The utility model discloses simple structure, cost are with low costs, under spectral range 486nm-950nm condition, realize need not the focusing and satisfy the user demand of observing round the clock to can extensively be applicable to the use in a plurality of fields of security protection control, on-vehicle camera lens.

Drawings

Fig. 1 is a schematic structural view of a wide-spectrum confocal apochromatic objective of the present invention;

FIG. 2 is a functional diagram of aberration according to the present invention;

FIG. 3 is a diagram of the aberration dispersion of the present invention;

FIG. 4 is a color aberration chart of the present invention;

fig. 5 is an aberration distortion diagram according to the present invention.

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. 1-5: the wide-spectrum confocal apochromatic objective lens comprises an objective lens body, wherein the objective lens body consists of a first negative lens 1, a second positive lens 2, a third positive lens 3, a fourth negative lens 4, a fifth negative lens 5, a sixth positive lens 6, a seventh positive meniscus lens 7 and a photosensitive chip 8, the third positive lens 3 and the fourth negative lens 4 are glued into a first glued lens, and the fifth negative lens 5 and the sixth positive lens 6 are glued into a second glued lens.

The mirror surfaces of the first negative lens 1, the second positive lens 2, the first cemented lens, the second cemented lens and the seventh positive meniscus lens 7 are all spherical.

And the third positive lens 3 and the fourth negative lens 4 in the first cemented lens and the fifth negative lens 5 and the sixth positive lens 6 in the second cemented lens are cemented by two cementing materials of H-ZK7 and H-FK61 respectively.

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。

Claims

1. a wide-spectrum confocal apochromatic objective is characterized in that: the lens comprises an objective lens body, wherein the objective lens body is composed of a first negative lens, a second positive lens, a third positive lens, a fourth negative lens, a fifth negative lens, a sixth positive lens, a seventh positive meniscus lens and a photosensitive chip, the third positive lens and the fourth negative lens are glued to form a first glued lens, and the fifth negative lens and the sixth positive lens are glued to form a second glued lens.

2. A broad spectrum confocal apochromatic objective lens of claim 1, wherein: the mirror surfaces of the first negative lens, the second positive lens, the first cemented lens, the second cemented lens and the seventh positive meniscus lens are all spherical.

3. A broad spectrum confocal apochromatic objective lens of claim 1, wherein: and the third positive lens and the fourth negative lens in the first cemented lens and the fifth negative lens and the sixth positive lens in the second cemented lens are cemented by two cementing materials of H-ZK7 and H-FK61 respectively.

4. A broad spectrum confocal apochromatic objective lens of claim 1, wherein: the objective body is designed for a confocal system, and the day and night use requirements can be met without focusing.

5. A broad spectrum confocal apochromatic objective lens of claim 1, wherein: the structural form of the objective lens body is a double-Gaussian structure, and the structure is favorable for correcting vertical aberration.

6. A broad spectrum confocal apochromatic objective lens of claim 1, wherein: the focal length of the objective lens body is 7.4, and the relative aperture is 1: 1.2, field of view 44 °, distortion-0.7%, and total system length 15.5 mm.