Portable retractable three-element large zoom ratio zoom lens
A large zoom ratio, telescopic technology, applied in optical components, optics, instruments, etc., can solve the problem of not being able to achieve large zoom ratio and miniaturization at the same time, and achieve shortened total optical length, compact lens structure, and reduced aperture. Effect
Active Publication Date: 2017-07-14
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 portable retractable three-element large zoom ratio zoom lens relates to the field of optical system design, and solves the problem that the existing telescopic zoom lens cannot realize large zoom ratio and miniaturization at the same time. The lens is sequentially provided with a zoom group, a fixed group, an iris diaphragm, and a compensation group along the direction from the object plane to the image plane; the zoom group includes a double-concave negative lens and four double-convex positive lenses; the zoom group includes three One meniscus-shaped negative lens and one doublet lens; the compensation group includes three doublet lenses and one thick lens. The compensation group adopts a telephoto structure, which moves the main body forward and reduces the total length of the system. The iris diaphragm is fixedly connected with the compensation group at the front end of the compensation group. In the present invention, the lens is elongated when the telephoto is used, and the lens is shortened when the short focus is used, which realizes the miniaturization and portability requirements; through the selection of a lower magnification, a large zoom ratio of more than 50 times is realized; through the selection of Gaussian parameters, the telephoto The end forms a telephoto structure, and the telephoto ratio reaches 0.5, which shortens the total optical length.
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...
Claims
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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