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Wide-angle lens

A wide-angle lens and lens technology, applied in the field of optical systems, can solve the problems of long lens length and large chromatic aberration of ultra-wide-angle lenses

Active Publication Date: 2018-02-23
KINKO OPTICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, ultra-wide-angle lenses are prone to the problem of large chromatic aberration, and the lens length is usually longer

Method used

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Examples

Experimental program
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Embodiment Construction

[0031] Please refer to figure 1 , what is shown is the first embodiment of the present invention, the wide-angle lens includes a first lens 10, a second lens 20, a third lens 30, A diaphragm ST, a fourth eyeglass 40 and a fifth eyeglass 50 are provided with CCD, CMOS or other photosensitive components (not shown) at the image side B, and a filter can be provided between the photosensitive element and the fifth eyeglass 50. Flat lenses 60 such as light sheet and / or protective glass, the number of flat lenses 60 can be increased or decreased or not provided according to requirements.

[0032] In this embodiment, the first lens 10 has a negative refractive power, its object side is convex and its image side is concave, and the radius of curvature of its object side is positive and greater than the curvature radius of the image side. The first lens 10 made of plastic Both the object side and the image side can be aspheric. In this paper, when the center of a curved surface is cl...

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PUM

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Abstract

A wide-angle lens comprises the first to fifth lenses arranged in sequence from the object side to the image side; the 1st, 2nd, and 4th lenses respectively have a negative refraction power, object side surfaces of said three are respectively convex surfaces, and image side surfaces of said three are respectively recessed surfaces; the third lens has a positive refraction power, the object side surface is a recessed surface, and the image side surface is a convex surface; the 5th lens has a positive refraction power, and the object side surface and the image side surface are respectively convex surfaces; the wide-angle lens satisfies with the following relation: 8.5 <TTL / F <11.25, thus providing wide angle and miniaturization characteristics.

Description

technical field [0001] The invention relates to an optical system, in particular to a five-chip imaging lens with wide-angle characteristics. Background technique [0002] A super wide-angle lens refers to a lens that can capture a wider scene than a wide-angle lens. It has a very wide viewing angle and a long depth of field, so it is often used to express a vast perspective effect. [0003] However, ultra-wide-angle lenses are prone to the problem of large chromatic aberration, and the lens length is usually longer. Therefore, how to improve these problems is really worthy of consideration by those skilled in the art. Contents of the invention [0004] The main purpose of the present invention is to provide a wide-angle lens with wide angle, low chromatic aberration and short overall length. [0005] In order to achieve the above and other objectives, the present invention provides a wide-angle lens, which sequentially includes a first lens, a second lens, a third lens,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00G02B13/06G02B13/18
CPCG02B13/0045G02B13/06G02B13/18
Inventor 陈思颖
Owner KINKO OPTICAL
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