Camera optics

Abstract

The invention relates to the field of optical lenses, and discloses a photographic optical lens. The photographic optical lens comprises in sequence from the object side to the image side: a first lens with positive refractive power, a second lens, a third lens, a fourth lens, The fifth lens, the sixth lens, the seventh lens, and the eighth lens; wherein, the focal length of the imaging optical lens is f, the optical total length of the imaging optical lens is TTL, the focal length of the second lens is f2, and the fourth lens has a focal length on the object side. The central radius of curvature is R7, the central radius of curvature of the image side surface of the fourth lens is R8, and the following relations are satisfied: 0.95≤f / TTL; ‑4.00≤f2 / f≤‑2.00; 2.50≤(R7+R8) / (R7 ‑R8)≤15.00. The imaging optical lens provided by the present invention not only has good optical performance, but also meets the design requirements of large aperture, long focal length, and ultra-thinning (in a long focal length system).

Description

technical field [0001] The invention relates to the field of optical lenses, in particular to an imaging optical lens suitable for portable terminal equipment such as smart phones and digital cameras, as well as 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 is increasing, and the photosensitive devices of general photographic lenses are nothing more than Charge Coupled Device (CCD) or Complementary Metal Oxide Semiconductor Device (Complementary Metal Semiconductor). -Oxide Semiconductor 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 have a trend of good functions and light, thin and short appearances. Therefore, with Miniaturized camera lenses with good imaging quality have become the mainstream in the curr...

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 eight-element lens structure gradually appears in the lens design. Common Although the eight-element lens already has good optical performance, its focal power, lens spacing and lens shape settings still have certain irrationality, resulting in a lens structure that cannot meet the requirements of large aperture, large aperture, and lens shape while having good optical performance. Ultra-thin, long focal length design requirements

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