Camera Optical Lens

Abstract

The present invention relates to the field of optical lenses, and discloses a photographic optical lens. The photographic optical lens includes, from the object side to the image side in sequence: a first lens with a positive refractive power, a second lens with a negative refractive power, and a lens with a negative refractive power. The third lens with positive refractive power, the fourth lens with negative refractive power, and the fifth lens; the radius of curvature of the image side of the first lens is R2, the radius of curvature of the object side of the first lens is R1, and the The focal length of the third lens is f3, the overall focal length of the imaging optical lens is f, the axial distance from the image side of the second lens to the object side of the third lens is d4, and the axis of the second lens is The upper thickness is d3, and the refractive index of the fourth lens is n4, which satisfies the following relationship: -20.00≤R2 / R1≤-2.00; 0.50≤f3 / f≤3.50; 1.50≤d4 / d3≤5.00; 1.69≤n4 ≤2.10. The imaging optical lens provided by the invention has good optical performance and at the same time meets the design requirements of large aperture and long focal length.

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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