Pick-up optical lens

Abstract

The invention discloses a pick-up optical lens, which, from an object side to an image side, sequentially comprises a first lens with positive refractive forces, a second lens with negative refractive forces, a third lens with negative refractive forces, a fourth lens with negative refractive forces, and a diaphragm, wherein the object-side surface and the image-side surface of the first lens areconvex surfaces; the object-side surface and the image-side surface of the second lens are concave surfaces; the object-side surface and the image-side surface of the third lens are aspheric surfaces; the image-side surface of the fourth lens is a concave surface and provided with at least an inflection point; the diaphragm is arranged between a photographed object and the second lens; the numberof the lenses with refractive forces in the pick-up optical lens is four; and the distance T12 of the first lens and the second lens on an optical axis, the focal distance f of the whole pick-up optical lens, the dispersion coefficient V1 of the first lens, the dispersion coefficient V2 of the second lens, and the focal distance f3 of the third lens satisfy the following formulas: (T12 / f)*100 is greater than 0.50 and less than 10.00, (V1-V2) is greater than 30.5 and less than 42.0, and (f / f3)*100 is greater than -60.0 and less than -0.5. Through the configuration mode of the lenses above, thevolumes of the lenses can be reduced effectively, and the sensitivity of an optical system is reduced so as to obtain a high resolving power.

Description

technical field [0001] The invention relates to a photographic optical lens, which is suitable for mobile phone cameras or digital cameras, etc.; in particular, it relates to a miniaturized photographic optical lens mounted on a mobile phone camera. Background technique [0002] In recent years, with the rise of mobile phone cameras, the demand for miniaturized photographic lenses has increased day by day, and the photosensitive device of general photographic lenses is nothing more than a photosensitive coupling device (Charge Coupled Device, CCD) or a complementary metal oxide semiconductor device (Complementary Metal-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 are developing with good functions and thin, light and small appearance. Therefore, it has Miniaturized photographic lenses with good imaging quality h...

AI Technical Summary

Problems solved by technology

When the pixel area of ​​the photosensitive device is gradually reduced, and the imaging quality requirements of the system are continuously improved, the conventional three-piece lens group will not be able to meet the requirements of higher-level photographic lens modules.

[0004] U.S. Patent No. 7,365,920 discloses a four-piece lens group, wherein the first lens and the second lens are bonded to each other with two glass spherical mirrors to form a doublet lens (Doublet), in order to eliminate chromatic aberration, but this method has its own disadvantages Disadvantages, because too many glass spherical mirror configurations will make the system lack of freedom, resulting in the total optical length of the system is not easy to shorten; moreover, because the glass lens is not easy to bond, it is easy to cause difficulties in the manufacturing process

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