Image lens assembly

Abstract

An image lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The first lens element with positive refractive power has a convex object-side surface. The second lens element has refractive power. The third lens element has positive refractive power. The fourth lens element has negative refractive power. The fifth lens element with positive refractive power has a convex object-side surface and a concave image-side surface. The sixth lens element with positive refractive power has a convex object-side surface and a concave image-side surface, wherein the image-side surface thereof changes from concave at a paraxial region to convex at a peripheral region. The fifth and sixth lens elements are made of plastic, and the surfaces thereof are aspheric. By virtue of the fifth and sixth lens elements with positive refractive power, the generation of high-order aberration can be reduced.

Description

technical field [0001] The present invention relates to an image lens system group, and in particular to a miniaturized image lens system group applied to electronic products. Background technique [0002] In recent years, with the rise of portable electronic products with photography functions, the demand for optical systems has increased day by day. The photosensitive element of the general optical system is nothing more than two types of photosensitive coupling device (Charge Coupled Device, CCD) or complementary metal oxide semiconductor device (Complementary Metal-Oxide Semiconductor Sensor, CMOS Sensor), and with the improvement of semiconductor process technology, The pixel size of the photosensitive element is reduced, and the optical system is gradually developing into the high-pixel field. Therefore, the requirements for imaging quality are also increasing. [0003] Traditional optical systems mounted on portable electronic products, as shown in U.S. Patent No. 7,...

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Problems solved by technology

[0003] The traditional optical system mounted on portable electronic products, as shown in US Patent No. 7,869,142, mostly adopts a four-piece lens structure. The prevalence of mobile devices has driven the rapid increase in pixel and imaging quality of optical systems. Known optical systems will not be able to meet higher-level photography systems.

[0004] Although there is a further development of the five-element optical system, as disclosed in US Patent No. 8,000,031, it is an optical system with five lenses. Although the imaging quality can be improved, the two lenses closest to the imaging surface are not designed to have positive refraction. Force, so that the optical system cannot effectively suppress the off-axis light distribution on the two lenses and the incident angle of the fourth lens and the fifth lens. If the refraction of the light changes too much, it will easily lead to the generation of high-order aberrations, and it is difficult to maintain Relative Illumination around the image

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