Image capturing lens assembly

Abstract

This invention provides an image capturing lens assembly in order from an object side to an image side comprising: a first lens element with positive refractive power having a convex object-side surface; a second lens element with negative refractive power; a third lens element with negative refractive power having a concave object-side surface; a fourth lens element having a concave object-side surface and a convex image-side surface; and a fifth lens element having a concave image-side surface, the object-side and image-side surfaces thereof being aspheric and at least one inflection point being formed on at least one of the object-side and image-side surfaces thereof. By such arrangement, it can effectively reduce the aberration as well as the total track length of the imaging lens system for obtaining higher image resolution.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This non-provisional application claims priority under 35 U.S.C. §119(a) on Patent Application No. 100118075 filed in Taiwan, R.O.C. on May 24, 2011, the entire contents of which are hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to an image capturing lens assembly, and more particularly, to a compact image capturing lens assembly used in electronic products.[0004]2. Description of the Prior Art[0005]In the process of technical innovation, with the popularity of mobile phones equipped with camera, the demand for compact photographing lenses is increasing. Generally, the sensor of a general photographing camera is none other than CCD (Charge Coupled Device) or CMOS device (Complementary Metal Oxide Semiconductor device). Furthermore, advances in semiconductor manufacturing technology have allowed the pixel size of sensors to be reduced and therefore lead imagin...

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Benefits of technology

[0009]By such arrangement, it can effectively reduce the aberration as well as the total track length of the imaging lens system for obtaining higher image resolution.

[0010]In the aforementioned image capturing lens assembly, the first lens element with positive refractive power provides the main refractive power of the system, and thereby the total track length thereof is reduced. When the second lens element has negative refractive power, the astigmatism of the system can be effectively corrected. When the third lens element has negative refractive power, and thereby the aberration of the system can be effectively corrected and the image quality thereof can be favorably improved. When the fourth lens element has positive refractive power, the total track length of the assembly can be effectively shortened and the sensitivity thereof can be also reduced. When the fifth lens element has negative refractive power, the high order aberration of the system can be effectively corrected.

[0011]In the aforementioned image capturing lens assembly, when the first lens element has a convex object-side surface, the positive refractive power of the lens elements can be strengthened and thereby the total track length of the assembly can be reduced even more. When the third lens element has a meniscus lens element, the aberration of the assembly can be corrected favorably for obtaining higher image quality. When the fourth lens element has a concave object-side surface and a convex image-side surface, the astigmatism of the assembly can be favorably corrected. When the fifth lens element has a concave image-side surface, the principle point can be positioned away from the image plane and thereby reducing the total track length of the assembly. When the fifth lens element has a concave object-side surface and a concave image-side surface, the Petzval Sum of the system can be effectively corrected, enabling the focal plane to become more flat near the periphery.

Problems solved by technology

However, due to the popularity of high standard mobile devices such as smart phones and PDAs (Personal Digital Assistant) driving the rapid improvements in high resolution and image quality of the current compact imaging lens systems, conventional four lens elements systems no longer satisfy the higher level camera modules.

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