Camera lens group in four pieces type

Abstract

The invention relates to a four- sheet type video lens group that includes the first lens, the second lens, the third lens and the fourth lens. The first lens is positive refraction power bend moon type lens; the second lens is the positive refraction power bend moon type lens; and the third lens is the positive refraction power bend moon type lens toward object side. The compound focus is f, the first lens focus distance is f1, the second lens focus distance is f2, and the third lens focus distance is f3, thus, it satisfies the conditional expression of 0.75 G02B 9 / 34 G02B 1 / 04 22 8 1 2005 / 5 / 30 1873461 2006 / 12 / 6 100478729 2009 / 4 / 15 2009 / 4 / 15 2009 / 4 / 15 Dali Photoelectric Co., Ltd. Taiwan Yetian Xiaobaihe wang mengxia yu changhua 11223

Description

technical field [0001] The invention relates to a four-piece photographic lens group used in a small image-taking device, which is related to the single-focus lens group of a general small-scale image-taking device, especially refers to a combination composed of four lenses, and adopts preset New four-element photographic lens group design with focal distance relationship configuration. Background technique [0002] As photographic lenses are widely used in modern times, and with the continuous growth of the consumer electronics industry, the demand for small imaging modules in the market today is increasing; especially in the industries of mobile phone cameras, computer network cameras, or The application of security image monitors for vehicles, etc.; users have continuously improved the performance requirements of the products, not only must the resolution quality be good, but also the error of the products must be reduced. [0003] The photosensitive components of genera...

AI Technical Summary

Problems solved by technology

[0004] First, the first lens of the existing lens module is a two-way convex lens, while the second lens is a two-way concave lens. However, the two-way convex lens and the two-way concave lens will have too much power, resulting in the entire is systematically unstable;

[0005] Second, the first lens of the conventional product is a two-way convex lens, while the second lens is a two-way concave lens, and both are made of glass lenses. Due to the outer diameter of the first lens and the second lens Very small (small lens), so the difficulty of bonding is high, and the production cost will increase, and the yield rate of conventional products will be relatively reduced

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