Wide-angle lens

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

Active Publication Date: 2020-06-23
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 , The one shown is the first embodiment of the present invention. The wide-angle lens includes a first lens 10, a second lens 20, and a third lens 30 in order from the object side A to the image side B on the optical axis L. An aperture ST, a fourth lens 40 and a fifth lens 50. A CCD, CMOS or other photosensitive element (not shown) is arranged on the image side B. A filter may be arranged between the photosensitive element and the fifth lens 50. Flat lenses 60 such as light sheets and / or protective glass, and 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 negative refractive power, the object side is convex and the image side is concave, and the curvature radius of the object side is positive and larger than the curvature radius of the image side. The first lens 10 made of plastic has a Both the object side and the image side can be aspherical...

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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 present invention relates to an optical system, in particular to a five-piece imaging lens with wide-angle characteristics. Background technique [0002] An ultra-wide-angle lens refers to a lens that can capture a wider scene than a wide-angle lens. It has a very wide angle of view and a long depth of field, so it is often used to express a wide perspective effect. [0003] However, the ultra-wide-angle lens is prone to large chromatic aberration, and the lens length is usually longer. Therefore, how to improve these problems is worthy of consideration by people in the field. Summary 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 includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens in sequen...

Claims

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Application Information

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