Optical system, imaging device and electronic device for photography

Abstract

The invention provides a photographing optical system, an image capturing device, and an electronic device. From the object space to the image space, the photographing optical system sequentially comprises a first lens which has positive refraction power, wherein the object space surface is a convex surface at a near optical axis; a second lens with the negative refraction power; a third lens, wherein the object space surface is a concave surface at the near optical axis, and the object space surface and the image space surface are aspheric surfaces; a fourth lens which has negative refraction power, wherein the object space surface is a concave surface at the near optical axis, the image space surface is a convex surface at the near optical axis, and the object space surface and the image space surface are aspheric surfaces. The front system configuration facilitates the obtaining of the balance between forming easiness and the proper sensitivity, and the obtaining of a better telescoping capability. In addition, the direction change of light can be slowed down after the light enters the system, thereby facilitating the reduction of the intensity of stray light, and improving the imaging quality.

Description

technical field [0001] The present invention relates to a photographic optical system and an image capturing device, in particular to a photographic optical system and an image capturing device applicable to electronic devices. Background technique [0002] With the gradual thinning of personal electronic products, the internal components of electronic products are required to have a smaller size. Under the market trend, the size of the photographic optical system must be miniaturized. In addition to the requirement of miniaturization, the pixel area of ​​the photosensitive element is reduced due to the advancement of semiconductor process technology, and the imaging lens is gradually developing into the field of high pixel. At the same time, the rise of electronic devices such as smartphones and tablet computers has also increased the demand for high-quality optical systems for miniature photography. [0003] The existing four-piece optical system is usually configured wi...

AI Technical Summary

Problems solved by technology

Although this structural configuration helps to reduce the back focal length, it is not easy to suppress the angle of light incident on the photosensitive element

In addition, in the telescopic optical system with a small viewing angle, the existing structural configuration also has the disadvantage that it is not easy to achieve a balance between easy molding and suitable sensitivity

[0004] To sum up, although the existing four-chip optical system has the advantage of miniaturization, the imaging quality is still not ideal. Therefore, there is an urgent need in the field for a photographic optical system that meets the needs of miniaturization and high imaging quality.

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