Optical photographing system

Abstract

An optical photographing system 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 an object-side surface being convex at a paraxial region thereof. The second lens element with negative refractive power has an object-side surface being concave at a paraxial region thereof. The third lens element has refractive power. The fourth lens element has refractive power. The fifth lens element with positive refractive power has an image-side surface being convex at a paraxial region thereof, and the surfaces thereof are aspheric. The sixth lens element with refractive power has an image-side surface changing from concave at a paraxial region thereof to convex at a peripheral region thereof, and the surfaces thereof are aspheric. When the optical photographing system satisfies specific conditions, the aberration of the system can be corrected effectively and the sensitivity of the system can be reduced. Consequently, the image quality is enhanced.

Description

technical field [0001] The present invention relates to an optical camera system group, and in particular to a miniaturized optical camera 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 a general optical system is nothing more than a photosensitive coupling device (Charge Coupled Device, CCD) or a complementary metal oxide semiconductor element (Complementary Metal-Oxide Semiconductor Sensor, CMOS Sensor). The pixel size of components is shrinking, and the optical system is gradually developing into the high-pixel field. Therefore, the requirements for imaging quality are also increasing. [0003] Traditional miniaturized optical mirrors mounted on portable electronic products, as shown in U.S. Patent No. 7,869,142 and No. 8,000,031, mostly use four or five lens structure...

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Problems solved by technology

[0003] Traditional miniaturized optical mirrors mounted on portable electronic products, as shown in U.S. Patent No. 7,869,142 and No. 8,000,031, mostly use four or five lens structures. However, due to smart phones (Smart Phone) and The prevalence of high-standard mobile devices such as PDA (Personal Digital Assistant) has driven the rapid increase in the pixel and imaging quality of the optical lens group. The known five-piece optical lens group will not be able to meet the higher-level photography needs.

[0004] Although there is a further development of the six-piece optical lens group at present, as disclosed in US Publication No. 2012 / 0229917, its refractive power distribution cannot effectively suppress its total length, and the design of the second lens surface has limited ability to correct aberrations, which reduces the The sensitivity effect is not good, so it is not enough for portable electronic products that require high image quality

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