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Wide-angle lens

A wide-angle lens and lens technology, applied in the field of wide-angle lens systems, can solve the problems of insufficient lens imaging quality, low system light throughput, and image quality impact, and achieve the effects of good processing technology, improved imaging quality, and low production costs.

Inactive Publication Date: 2010-12-29
凤凰光学(广东)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the image quality of the lens with this structure is not good enough
Theoretically speaking, the larger the FNO value (the reciprocal of the relative aperture), the lower the brightness of the system, that is, the less light entering the system, making the image look darker and affecting the image quality

Method used

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Embodiment Construction

[0022] Such as figure 2 As shown, the present invention includes a first lens group L1 with a negative focal length, a stop ST, a second lens group L2 with a positive focal length, an optical filter IR, a protective glass C, and an image plane from the object side. The first lens group L1 includes a first lens G1 with a negative focal length, a second lens G2 with a negative focal length, and a third lens G3 with a positive focal length, wherein the second lens group L2 consists of a fourth lens G4, a fifth lens G5, and a sixth lens Composed of G6, the fourth lens G4 has a positive focal length, the fifth lens G5 and the sixth lens G6 have a positive focal length after being cemented, and the following conditions are met between the first lens group L1 and the second lens group L2:

[0023] -3L1 / f L2 <-0.5 (1)

[0024] where f L1 Indicates the combined focal length of the first lens group L1, f L2 Indicates the combined focal length of the second lens group L2.

[0025]...

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Abstract

The invention discloses a wide-angle lens which comprises a first lens group with negative focus length, a diaphragm and a second lens group with positive focus length from an object, wherein the first lens group comprises a first lens with negative focus length, a second lens with negative focus length and a third lens with positive focus length; the second lens group comprises a fourth lens, a fifth lens and a sixth lens, the fourth lens is provided with positive focus length, and the fifth lens and the sixth lens have positive focus length after being glued; and the first lens group and the second lens group meet the following condition of -3<fL1 / fL2<-0.5, wherein fL1 expresses the combined focus length of the first lens group, and fL2 expresses the combined focus length of the second lens group. By adopting six full-glass lens structures, the invention has the advantages of compact structure, better machining manufacturability and low production cost. The wide-angle lens has better imaging quality under the condition of ensuring wide angle, and improves the imaging quality because the whole optical system enlarges the tolerance.

Description

(1) Technical field: [0001] The invention relates to a wide-angle lens system, which is especially suitable for monitors and rear-view wide-angle lenses for vehicles. (two) background technology: [0002] In recent years, with the development of the automobile industry, the demand for automotive lenses is increasing. Since such automotive lenses are installed in a limited space and also need to reflect a large field of view, wide-angle automotive lenses must be used. In the past, wide-angle lenses were designed to meet the requirements of imaging quality and viewing angle by increasing the number of glass lenses. For example, if the viewing angle is required to be more than 100 degrees, about 8 to 10 or more all-glass lenses are required; or adding aspheric plastics Lens, in this way, about 4 to 6 lenses are needed, but due to the high price of aspheric plastic lenses and the poor chemical stability of the material, this virtually increases the production cost and increases ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/06B60R1/02
Inventor 席爱平谭少沛胡长涛李伟娜
Owner 凤凰光学(广东)有限公司
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