Pick-up optical lens

Abstract

The invention relates to the field of the optical lens, and discloses a pick-up optical lens. The pick-up optical lens comprises a first lens with positive refraction power, a second lens with negative refraction power, a third lens with positive refraction power, a fourth lens with negative refraction power and a fifth lens from an object side to an image side; the curvature radius of the first lens image side is R2, the curvature radius of the first lens object side is R1, the focal length of the third lens is f3, the entire focal length of the pick-up optical lens is f, the on-axis range tothe object side of the third lens from the image side of the second lens is d4, the on-axis thickness of the second lens is d3, the refractive index of the fourth lens is n4, and the following relation formulas are satisfied: R1 / R1 is not less than -20.00 and not more than -2.00, f3 / f is not less than 0.50 and not less than 3.50, d4 / d3 is not less than 1.50 and not more than 5.00, and n4 is not less than 1.69 and not more than 2.10. The pick-up optical lens provided by the invention can satisfy the design requirements of large aperture and long focal length when the good optical performance is provided.

Description

【Technical field】 [0001] The invention relates to the field of optical lenses, in particular to an imaging optical lens suitable for portable terminal devices such as smart phones and digital cameras, and imaging devices such as monitors and PC lenses. 【Background technique】 [0002] In recent years, with the rise of smart phones, the demand for miniaturized photographic lenses has been increasing, and the photosensitive devices of general photographic lenses are nothing more than photocoupled devices (Charge Coupled Device, CCD) or complementary metal oxide semiconductor devices (Complementary Metal -OxideSemiconductor Sensor, CMOS Sensor), and due to the improvement of semiconductor manufacturing process technology, the pixel size of photosensitive devices has been reduced, and today's electronic products are developing with good functions and thin, light and small appearance. Therefore, they have good Miniaturized camera lenses with image quality have become the mainstrea...

AI Technical Summary

Problems solved by technology

However, with the development of technology and the increase of diversified needs of users, as the pixel area of ​​the photosensitive device continues to shrink, and the system’s requirements for imaging quality continue to increase, the five-element lens structure gradually appears in the lens design. Common Although the five-element lens already has good optical performance, its long focal length, optical power, lens spacing and lens shape settings still have certain irrationality, resulting in a lens structure that cannot meet the requirements while having good optical performance. Design requirements for large aperture and long focal length

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