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a zoom lens

A zoom and lens technology, applied in the field of zoom lenses, can solve the problems of restricting the promotion and application of 4K lenses, long length, large volume, etc., and achieve the effects of good infrared confocal characteristics, low cost, and small volume

Active Publication Date: 2018-12-11
JIAXING ZHONGRUN OPTICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to achieve the level of 4K, the lens uses a 1 / 1.7inch image sensor with large pixels and a large target area, making the total length of the lens up to 97mm, which is too bulky and limits the promotion and application of 4K lenses
[0004] Therefore, the existing "4K" ultra-high-definition camera has the defects of too long length and too large volume. To broaden the application range of "4K" ultra-high-definition camera, it is urgent to design a low-cost, small-volume, light-weight, high-performance, large-aperture , infrared confocal ultra-high-definition zoom lens suitable for 4K cameras

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] Refer below figure 1 , 2 , to illustrate the first embodiment of the present invention.

[0090] The zoom lens is arranged in sequence along the light incident direction, the first lens group A with positive refractive power, the second lens group B with negative refractive power, the diaphragm S, and the third lens with positive refractive power Group C, fourth lens group D with positive refractive power. In addition, on the imaging surface IMAGE, a light-receiving surface of a solid-state imaging element such as a CCD or a CMOS is arranged.

[0091] The lens group A includes a first lens, a second lens, and a third lens in order from the object side along the optical axis direction. The first lens is a spherical lens with a negative refractive power; the second lens is a spherical lens with a positive refractive power, and the first lens and the second lens are cemented to form a cemented lens with a positive combined refractive power. The concave surface faces th...

Embodiment 2

[0201] Refer below image 3 , 4 , to illustrate the second embodiment of the present invention.

[0202] The zoom lens is arranged in sequence along the light incident direction, the first lens group A with positive refractive power, the second lens group B with negative refractive power, the diaphragm S, and the third lens with positive refractive power Group C, fourth lens group D with positive refractive power. In addition, on the imaging surface IMAGE, a light-receiving surface of a solid-state imaging element such as a CCD or a CMOS is arranged.

[0203] The lens group A includes a first lens, a second lens, and a third lens in order from the object side along the optical axis direction. The first lens is a spherical lens with a negative refractive power; the second lens is a spherical lens with a positive refractive power, and the first lens and the second lens are cemented to form a cemented lens with a positive combined refractive power. The concave surface faces the...

Embodiment 3

[0313] Refer below Figure 5 , 6 , to illustrate the third embodiment of the present invention.

[0314] The zoom lens is arranged in sequence along the light incident direction, the first lens group A with positive refractive power, the second lens group B with negative refractive power, the diaphragm S, and the third lens with positive refractive power Group C, fourth lens group D with positive refractive power. In addition, on the imaging surface IMAGE, a light-receiving surface of a solid-state imaging element such as a CCD or a CMOS is arranged.

[0315] The lens group A includes a first lens, a second lens, and a third lens in order from the object side along the optical axis direction. The first lens is a spherical lens with a negative refractive power; the second lens is a spherical lens with a positive refractive power, and the first lens and the second lens are cemented to form a cemented lens with a positive combined refractive power. The concave surface faces t...

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Abstract

The invention relates to a zoom lens. The zoom lens sequentially comprises a first lens group A, a second lens group B, a diaphragm S, a third lens group C and a fourth lens group D along a light incidence direction, wherein the focal power of the first lens group A is positive, the focal power of the second lens group B is negative, the focal power of the third lens group C is positive, and the focal power of the fourth lens group D is positive; the lens group A and the lens group C are constantly fixed, the lens group B moves from an object side to an image surface side along an optical axis to allow a lens field angle to zoom from a wide angle end to a telescoping end, and the lens group D moves along the optical axis to correct an image surface and relate the focal distance so as to guarantee the stability of the system image surface during focal distance change. The zoom lens has the advantages that by the special structure and a plurality of aspheric lenses, '4K' performance is achieved in a 1 / 2.5 small imaging circle diameter, and the defect that an existing '4K' ultrahigh-definition camera is excessively long and large is overcome.

Description

technical field [0001] The invention relates to a zoom lens, in particular to a low-cost, small-volume, light-weight, high-performance, large aperture, and infrared confocal ultra-high-definition zoom lens suitable for 4K video cameras. Background technique [0002] With the development of social economy, the improvement of people's living standards, and the increasingly busy traffic network, higher requirements are put forward for intelligent and efficient monitoring. With the introduction of the concept of "4K" (generally refers to 8 million pixels, hereinafter abbreviated) ultra-high-definition camera technology, the ordinary "1080P" (generally refers to 2 million pixels, hereinafter abbreviated) can no longer meet the needs of the market, and the camera needs to be equipped with a larger caliber , Higher resolution, infrared wide spectrum, confocal superior camera lens to ensure superior video surveillance quality. Therefore, ultra-high-definition zoom lenses suitable f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B15/173
CPCG02B15/173
Inventor 葛航笠陈三忠尚洁阳盛亚茗张平华
Owner JIAXING ZHONGRUN OPTICAL TECH