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Wide-angle lens

A wide-angle lens and lens group technology, applied in the field of lenses, can solve the problems of high cost and high production cost of aspherical lenses, and achieve the effects of low cost, fewer lenses, and reduced aberrations

Active Publication Date: 2010-02-10
YOUNG OPTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the production cost of the aspheric lens is relatively high, so that the cost of the wide-angle lens 100 using the aspheric lens is too high

Method used

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Embodiment Construction

[0031] The following descriptions of various embodiments refer to the accompanying drawings to illustrate specific embodiments in which the present invention can be practiced. The direction terms mentioned in the present invention, such as "up", "down", "front", "rear", "left", "right", etc., are only referring to the directions of the drawings. Accordingly, the directional terms are used to illustrate, not to limit, the invention.

[0032] figure 2 It is a schematic structural diagram of a wide-angle lens according to an embodiment of the present invention. refer to figure 2 , the wide-angle lens 200 of this embodiment is suitable for imaging a scene located on an object side to an image side, wherein the image side can be configured with, for example, a charge coupled device (charge coupled device, CCD), a complementary metal oxide semiconductor (Complementary Metal-Oxide Semiconductor) , CMOS) or film or other photosensitive element (light sensing device) 10, to captur...

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Abstract

The invention relates to a wide angle lens, which comprises a first lens group and a second lens group arranged in sequence from an object side to an image side. The first lens group comprises a firstspherical lens, a second spherical lens and a third spherical lens arranged in sequence from the object side to the image side. The second lens group comprises a fourth spherical lens and a fifth spherical lens arranged in sequence from the object side to the image side. The refractions from the first spherical lens to the fifth spherical lens are negative, negative, positive, positive and positive in sequence. The wide angle lens meets the following two conditions: 1 < D / F G1 is less than 3 and D / F G2 is more than 4 and is less than 6, wherein, D is the distance from the surface of the fistspherical lens facing the object side to the image side; F G1is the effective focal length of the first lens group, and F G2 is the effective focal length of the second lens group. The wide angle lens has an advantage that, as the five lenses adopted by the wide angle lens are all spherical lenses, cost can be reduced.

Description

technical field [0001] The present invention relates to a lens, and in particular to a wide angle lens. Background technique [0002] With the progress of modern video technology, image devices such as digital video camera (DVC) and digital camera (DC) have been widely used and widely used in various fields. One of the core components of these image apparatuses is a lens, which is used to clearly image images on a screen or a charge coupled device (CCD), and when the image apparatus is used in some specific fields In medium mode, it uses a wide-angle lens to increase the field of view (FOV). For example, a car reversing camera requires a wide-angle lens. [0003] Generally speaking, the angle of view of a wide-angle lens for a car is above 90 degrees. The images captured by the wide-angle lens usually have serious TV distortion on the screen, and the value usually exceeds 10%. Therefore, how to design a wide-angle lens with a wide viewing angle without causing severe TV ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/04G02B13/00G02B9/04G02B27/00
Inventor 谢定衡
Owner YOUNG OPTICS
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