Portable flexible triple-component high-zoom ratio varifocal lens
A large zoom ratio and telescopic technology, which is applied to optical components, optics, instruments, etc., can solve the problems that the large zoom ratio and miniaturization cannot be realized at the same time, and achieve the reduction of the total optical length, the reduction of the aperture, and the zoom of the lens barrel. fine effect
Active Publication Date: 2015-07-15
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology
[0005] In order to solve the problem that the existing telescopic zoom lens cannot realize large zoom ratio and miniaturization at the same time, the present invention provides a portable telescopic three-element large zoom ratio zoom lens
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[0040] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0041] The portable scalable three-element large zoom ratio zoom lens of the present invention is a long focal length, large zoom ratio, telescopic continuous zoom lens, mainly used in high-resolution photography, and the working waveband is 486nm~656nm In the visible light band, the focal length is 12mm-600mm, the zoom ratio is 50 times, the relative aperture is 1 / 4.5-1 / 7, and the field of view is 42.1°-0.85°.
[0042] Such as figure 1 As shown, the portable retractable three-element large variable ratio zoom lens of the present invention adopts a three-element structure, according to the order from front to back, along the light direction (along figure 1 or figure 2 In the direction from left to right, that is, the direction from the object plane to the image plane), there are zoom group 1 with positive focal power, fixed group 2 with negative focal powe...
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The invention discloses a portable flexible triple-component high-zoom ratio varifocal lens which relates to the field of optical system designs and solves the problem that high-zoom ratio and miniaturization cannot be simultaneously realized in the existing flexible varifocal lens. The lens is sequentially provided with a zoom group, a fixed group, a variable diaphragm and a compensation group from an object plane to an image plane, wherein the zoom group comprises a double-concave minus lens and four double-convex plus lenses; the fixed group comprises three meniscus minus lenses and a doublet lens; the compensation group comprises three doublet lenses and a thick lens and adopts a telephotographing structure, so that the main plane is moved forward and the total length of the system is reduced. The variable diaphragm is fixedly connected between the front end of the compensation group and the compensation group. The varifocal lens disclosed by the invention is extended in a long focus while is shortened in a short focus, so that the miniaturized portable requirement is realized. By virtue of relative lower segmenting of magnification, the high zoom ratio of over 50 times is realized; by selecting Gaussian parameter, the telephotographing structure is formed at the long focus end, the telephotographing ratio reaches 0.5 and the optical total length is shortened.
Description
technical field [0001] The invention relates to the technical field of optical system design, in particular to a portable telescopic three-element zoom lens with a large zoom ratio. Background technique [0002] The zoom lens has special advantages such as being able to produce a higher sense of reality and artistic effects, because it is widely used in fields such as television, photography, and photography. With the development of photographic technology, the zoom lens is required to have a longer focal length, a larger zoom ratio and higher imaging quality, but this is in contradiction with the miniaturization of the zoom lens, and the two cannot be achieved at the same time. [0003] At present, in the existing mechanically compensated four-group zoom lens structure, the length of the optical system of the zoom lens is shortened by adopting reasonable magnification selection, shortening the focal length of each component, and using aspheric elements. At the same time, t...
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IPC IPC(8): G02B15/173
CPCG02B15/173
Inventor 李宏壮王建立刘欣悦李洪文
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI