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Fixed focal lens and image pickup device

A fixed-focus lens and lens technology, applied in optical components, optics, instruments, etc., can solve problems such as inability to realize all-weather color monitoring

Active Publication Date: 2018-01-26
ZHEJIANG DAHUA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the aperture of the above-mentioned fixed-focus lens can only achieve F1.8. In the extremely low-light environment at night, the image can be clearly imaged by supplementing the infrared light; at this time, the camera needs to switch to black and white mode, which cannot realize all-weather color monitoring

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  • Fixed focal lens and image pickup device

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Embodiment Construction

[0030] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0031] like figure 1 as shown, figure 1 A schematic structural view of the fixed-focus lens of the present application is shown, by figure 1 It can be seen that the fixed-focus lens provided in this embodiment includes: two lens groups and a filter 11, wherein the two lens groups are the first lens group 1 and the second lens group arranged along the direction from the object side to the image side. In the lens group 2, the filter 11 ...

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Abstract

The present invention relates to the optical imaging technology field, in particular to a fixed focal lens and an image pickup device. The fixed focal lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens which are arranged along a direction from the object side to the image side. By limiting the structures of the lens in each lens group, and the correspondence relationship of the focal lengths, the refractive indexes and the dispersion coefficients of two lenses, an aperture of the fixed focal lens is improved effectively, and an image pickup effect is improved.

Description

technical field [0001] The invention relates to the technical field of optical imaging, in particular to a fixed-focus lens and an imaging device. Background technique [0002] A fixed-focus lens in the prior art includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens arranged in sequence from the object side to the image side, and the second lens, the third lens and the fourth lens The lenses are all made of plastic aspheric lenses, the first lens and the fifth lens are glass spherical lenses; the first lens is a convex-convex negative power lens, the second lens is a concave-convex positive power lens, and the third lens is a double-convex positive power lens The fourth lens is a double-concave negative power lens, and the fifth lens is a double-convex positive power lens. However, the aperture of the above-mentioned fixed-focus lens can only achieve F1.8. In the extremely low-light environment at night, the image can be clearly imaged by supple...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00
Inventor 胡长涛林法官刘凯丁洪兴
Owner ZHEJIANG DAHUA TECH CO LTD
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