Optical lens

Abstract

The invention provides an optical lens. The optical lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens in sequence from the object side to the image side, whereinthe first lens has positive focal power; the second lens is a meniscus lens with negative focal power, the object side surface is a convex surface, and the image side surface is a concave surface; the third lens has negative focal power; the fourth lens has positive focal power; and the fifth lens is a meniscus lens with positive focal power, the object side surface is a convex surface, and the image side surface is a concave surface. The optical lens provided by the invention can achieve small FNO, small distortion, low cost and high thermal stability while maintaining lens miniaturization through optimally setting the shape of each lens and reasonably distributing the focal power of each lens.

Description

technical field [0001] The invention relates to the field of optical lenses, in particular to an optical lens capable of at least achieving small FNO, small distortion, low cost and high thermal stability while ensuring miniaturization. Background technique [0002] For some lenses, it is necessary to collect as much light as possible so that the image sensor chip behind the lens can receive most of the energy of the incident light. Therefore, this kind of lens requires a small FNO, so that the lens can receive more light, and the requirement for distortion is also high. [0003] Here, FNO refers to the ratio of the focal length to the clear aperture, which reflects the amount of light transmitted by the lens. The smaller the FNO value, the larger the aperture, and the larger the light transmission of the lens. [0004] However, for a lens with a small Fno (~1.2 or so), it directly makes it difficult to achieve the small dispersion of the usual imaging lens. For such a len...

AI Technical Summary

Problems solved by technology

[0004] However, for a lens with a small Fno (~1.2 or so), it directly makes it difficult to achieve the small dispersion of the usual imaging lens. For such a lens with a small Fno, the diffuse spot is generally controlled within half the pixel size, for example : For a lens with a pixel size of 100um, the diffuse spot should be controlled within 50um

In actual production, it is inevitable to introduce various tolerances, so the dispersion becomes worse, and the received energy of the pixel is weakened, thereby reducing the performance of the lens; when the ambient temperature changes, the lens is deformed, and the best image plane deviates from the position of the chip, which will also cause the reception Poor end lens performance

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