Wide-angle lens

Abstract

A wide-angle lens is sequentially arranged along the optical axis from the object side to the image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a Seventh lens. The first lens has negative refractive power, the second lens has negative refractive power, the third lens has positive refractive power, the fourth lens has positive refractive power, the fifth lens has positive refractive power, and the sixth lens has Negative refractive power, the seventh lens has positive refractive power. It satisfies the following conditions: 0.2<f / f7<0.5, where f is the focal length of the wide-angle lens, and f7 is the focal length of the seventh lens. Through the above design, the wide-angle characteristics of the lens can be enhanced and the image quality can be improved.

Description

technical field [0001] The present invention relates to an optical lens; in particular, it refers to a wide-angle lens. Background technique [0002] In recent years, with the rise of portable electronic products with photography functions, the demand for optical systems has increased day by day. The photosensitive component of the general optical system is nothing more than two types of photosensitive coupling device (Charge Coupled Device, CCD) or complementary metal oxide semiconductor sensor (Complementary Metal-Oxide Semiconductor Sensor, CMOS Sensor), and with the improvement of semiconductor process technology, making The pixel size of photosensitive components is reduced, and the optical system is gradually developing into the high-pixel field. In addition, as the temperature of the external application environment of automotive lenses changes, the requirements for lens quality for temperature also increase. Therefore, the requirements for image quality are also inc...

AI Technical Summary

Problems solved by technology

[0003] However, the existing wide-angle lens can no longer meet the existing needs. Therefore, how to provide a wide-angle lens that can effectively reduce aberrations, improve optical imaging quality, and have a large viewing angle is one of the directions of painstaking research by the inventors.

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