Long-wavelength infrared continuous zoom lens

A long-wave infrared, zoom lens technology, applied in the field of zoom lenses, can solve the problems of the relative aperture of the lens is not fixed, the length of the continuous zoom system is long, the installation and debugging are difficult, etc., to solve the problem of sensitivity changes, compact structure, high transmittance Effect

Active Publication Date: 2011-01-19
NINGBO SUNNY INFRARED TECH COMPANY
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Problems solved by technology

[0005] In the existing public technology, the number of uncooled long-wave infrared continuous zoom lens lenses is mostly 5 or more, and the relative aperture of the lens is not fixed during the continuous zoom process , there are problems such as long continuous zoom system length, difficult installation and debugging, and high cost

Method used

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  • Long-wavelength infrared continuous zoom lens

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Embodiment Construction

[0034] figure 1 It is a structural schematic diagram of the long-wave infrared continuous zoom lens described in the present invention.

[0035] Generally speaking, since the long-wave infrared continuous zoom lens is applied in an uncooled thermal imager, the structure needs to be as compact and simple as possible. Four lenses are used, and with the help of a certain focal power parameter design, the technical effect of zoom ratio of 4 times or even 5 times can be achieved.

[0036] As shown in the figure, the long-wave infrared continuous zoom lens is sequentially arranged along the optical axis from the object side to the image side: a first lens 100 with positive refractive power, a second lens 200 with negative refractive power, and a third lens with positive refractive power. The lens 300 , the fourth lens 400 with positive refractive power, and the imaging surface 600 , where the image entering from the first lens 100 passes through the lens and finally enters the imag...

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Abstract

The invention discloses a long-wavelength infrared continuous zoom lens. Four lenses are arranged along an optical axis from an object side to an image side in turn, wherein the first lens and the third lens are fixed on the optical axis and are incapable of moving; the second and fourth lenses are capable of moving along the optical axis; the second lens is a zoom lens; and the fourth lens is an offset lens. A system diaphragm is fixed between the second and third lenses. In the invention, the four lenses are used to realize high-magnification zoom, so the system is more compact in structure, lighter in weight, lower in processing cost and simpler in system assembly. In addition, the fixed system diaphragm is arranged between the lenses, so the long-wavelength infrared continuous zoom lens can keep a constant F number in a zoom process. Thus, the problem of sensitivity change of the system in the zoom process of the conventional design is solved. Practices prove that the technical scheme has a desirable application effect.

Description

technical field [0001] The invention relates to a zoom lens, in particular to a compact long-wave infrared continuous zoom lens for an uncooled detector. Background technique [0002] At present, the development and application of continuous zoom lenses are becoming more and more extensive. In particular, the long-wave infrared continuous zoom lens applied to uncooled detectors has been used more and more. [0003] This is because, firstly, the long-wave infrared uncooled detector technology is becoming more and more mature; secondly, the uncooled detector has the characteristics of compact structure, low power consumption, and low cost; these characteristics determine that uncooled detectors are widely used in military applications. It has been widely used in various civil and civil fields. [0004] Among them, the infrared continuous zoom lens configured by it can change the focal length of the system within a certain range by moving the lens group, so that the size of t...

Claims

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Application Information

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IPC IPC(8): G02B15/167
Inventor 任和齐黄林
Owner NINGBO SUNNY INFRARED TECH COMPANY
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