Wide-angle lens

A wide-angle lens and lens technology, applied in the field of lenses, can solve the problems of heavy, large lens, blurred and out-of-focus images, etc., to achieve the effect of improving optical performance and shortening the overall length

Active Publication Date: 2008-04-16
ASIA OPTICAL CO INC
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AI Technical Summary

Problems solved by technology

The reason why the spherical surface is used is because it is easier to process, but the spherical surface is not the most suitable lens shape for optical imaging, it will produce many aberrations, resulting in blurred and out-

Method used

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Examples

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Embodiment Construction

[0020] Please refer to figure 1 As shown, the wide-angle lens 10 of the present invention is mainly composed of five lenses, which are sequentially from the object side to the image side: the first lens 11, the second lens 12, the third lens 13 and the cemented lens, wherein the first lens 11 is a lens with a high A negative lens with a refractive index, the first surface on the object side is a convex surface facing the object, which is used to absorb light within a large viewing angle range, and this first surface is designed as an aspheric surface, which can control the barrel shape deformation; the second lens 12 is a crescent-shaped positive lens, which is placed behind the diaphragm (not shown) and the concave surface faces the object side. The lens 12 has at least one aspheric surface, mainly as the compensation of the first lens 11 Eyeglass; The third lens 13 is also a positive lens of crescent shape, has at least one aspheric surface, and this lens 13 is mainly used f...

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Abstract

The invention discloses a wide-angle lens with a larger hole diameter and a 80 degrees wide vision angle; the wide-angle lens comprises the following elements from the object to the image: a first lens, a second lens, a third lens and a balsaming lens, wherein, the first lens is a negative lens with high refractive index, the first surface of the first lens located at the side of the object is a convexity facing to the object, and the first surface also adopts a non-spherical design; the second lens is a crescent positive lens which is arranged behind an iris(not shown in the figure) and faces to the object, the crescent positive lens is provided with at least one non-spherical face; the third lens is also a crescent positive lens which is provided with at least one non-spherical face; the balsaming lens is made by gluing a fourth lens and a fifth lens and is of plus power. The wide-angle lens satisfies a particular condition, so the whole length of the lens can be more effectively shortened and the product is compacter.

Description

【Technical field】 [0001] The invention relates to a lens, in particular to a wide-angle lens suitable for digital image products. 【Background technique】 [0002] Lenses used in digital imaging products (such as video cameras, digital cameras, etc.) can be divided into three categories: standard lenses, short-focus (wide-angle) lenses, and telephoto (telephoto) lenses according to their focal length or field of view. Generally, a wide-angle lens refers to a short-focus lens. Generally, the longer the focal length, the smaller the angle of view and the smaller the shooting range; the shorter the focal length, the larger the angle of view and the larger the shooting range. Using a wide-angle lens can expand the shooting field of view, and take pictures of panoramas or large scenes within a limited distance range. For example, the use of a wide-angle lens in a video camera is also for the purpose of being able to capture all the clients performing network video communication in...

Claims

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Application Information

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IPC IPC(8): G02B13/06G02B13/18
Inventor 唐乃元
Owner ASIA OPTICAL CO INC
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