Image pick-up lens

Abstract

The invention discloses an image pick-up lens. The image pick-up lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens an a sixth lens which are distributed from an object side to an image side sequentially; the first lens has positive refractive power, and the object side surface of the first lens is a convex surface; the second lens has negative refracting power, and the image side surface of the second lens is a concave surface; the third lens has negative refractive power; the fourth lens has refractive power; the fifth lens has positive refractive power, and the image side surface of the fifth lens is a concave surface or a flat surface at a paraxial position, and the fifth lens has at least one convex surface at off-axis positions; and the sixth lens has negative refractive power. The image pick-up lens satisfies the following formulas that: 0.5<=f / f5< 1.5, wherein f is the effective focal length of the image pick-up lens, and f5 is the effective focal length of the fifth lens; and -1.6<f / f6<-0.7, wherein f6 is the effective focal length of the sixth lens. According to the image pick-up lens configured as the above manners, high resolution can be ensured, the relative illumination of the periphery of the image pick-up lens can be improved; and the overall optical power of the image pick-up lens is located at the front relatively, so that the size of the image pick-up lens can be effectively reduced, and the miniaturization of the image pick-up lens can be ensured.

Description

technical field [0001] The present invention relates to the field of imaging, and more specifically, to an imaging lens. Background technique [0002] The photosensitive element of the general optical system is a photosensitive coupling device (CCD) or a complementary metal oxide semiconductor element (CMOS). With the improvement of semiconductor process technology, the pixel size of the photosensitive element is continuously reduced, and the corresponding optical system is also tending to have high resolution and high quality performance. [0003] The previous five-element lens has been unable to meet the market's demand for high quality. In the small-aperture configuration, the lens has effectively improved the imaging quality while maintaining the characteristics of miniaturization, but it still needs to further improve performance such as pixels and resolution. In order to meet the demand for high resolution, a large-aperture configuration is required to meet the illumi...

AI Technical Summary

Problems solved by technology

[0003] The previous five-element lens has been unable to meet the market's demand for high quality. In the small-aperture configuration, the lens has effectively improved the imaging quality while maintaining the characteristics of miniaturization, but it still needs to further improve performance such as pixels and resolution.

In order to meet the demand for high resolution, it is necessary to adopt a large-aperture configuration to meet the demand for illumination. However, the known five-chip structure will not be able to further shorten the system length and meet the image quality requirements under the large-aperture configuration.

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