News Column

Patent Issued for Photographing Lens Assembly

August 6, 2014



By a News Reporter-Staff News Editor at Electronics Newsweekly -- A patent by the inventors Tsai, Tsung-Han (Taichung, TW); Chen, Wei-Yu (Taichung, TW), filed on October 9, 2012, was published online on July 22, 2014, according to news reporting originating from Alexandria, Virginia, by VerticalNews correspondents.

Patent number 8786964 is assigned to Largan Precision Co., Ltd. (Taichung, TW).

The following quote was obtained by the news editors from the background information supplied by the inventors: "The present disclosure relates to a photographing lens assembly. More to particularly, the present disclosure relates to a compact photographing lens assembly applicable to electronic products.

"In recent years, with the popularity of mobile products with camera functionalities, the demand of miniaturized optical lens systems is increasing. The sensor of a conventional photographing camera is typically a CCD (Charge-Coupled Device) or a CMOS (Complementary Metal-Oxide-Semiconductor) sensor. As the advanced semiconductor manufacturing technologies have allowed the pixel size of sensors to be reduced and compact optical lens systems have gradually evolved toward the field of higher megapixels, there is an increasing demand for compact optical lens systems featuring better image quality.

"A conventional compact optical lens system adopts a three-element lens structure such as U.S. Pat. No. 8,094,231 B2 which provides a good image quality and a compact size. The said optical lens system provides a first lens element and a second lens element both with positive refractive power, and a third lens element with negative refractive power. However, only one lens element with negative refractive power cannot reduce the back focal length of the optical lens system, so that the requirement of the compact size for the optical lens system is hard to obtain. Moreover, the refraction angle from the optical lens system cannot be minimized by the curvature of the surfaces of the second lens element and the third lens element, so that the aberration and the loss of the peripheral brightness thereof cannot be controlled."

In addition to the background information obtained for this patent, VerticalNews journalists also obtained the inventors' summary information for this patent: "According to one aspect of the present disclosure, a photographing lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element and a third lens element. The first lens element with positive refractive power has an object-side surface being convex at a paraxial region. The second lens element with negative refractive power has an object-side surface being concave at a paraxial region and an image-side surface being concave or planar at a paraxial region, wherein the second lens element is made of plastic material and the object-side surface and the image-side surface of the second lens element are aspheric. The third lens element with negative refractive power has an object-side surface being concave at a paraxial region, and an image-side surface being concave at a paraxial region and being convex at a peripheral region, wherein the third lens element is made of plastic material, and the object-side surface and the image-side surface of the third lens element are aspheric.

"According to another aspect of the present disclosure, a photographing lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element and a third lens element. The first lens element with positive refractive power has an object-side surface being convex at a paraxial region. The second lens element with negative refractive power has an object-side surface being concave at a paraxial region and an image-side surface being concave or planar at a paraxial region, wherein the second lens element is made of plastic material, and the object-side surface and the image-side surface of the second lens element are aspheric. The third lens element with negative refractive power has an object-side surface being concave at a paraxial region, and an image-side surface being concave at a paraxial region and being convex at a peripheral region, wherein the third lens element is made of plastic material, and the object-side surface and the image-side surface of the third lens element are aspheric. When a curvature radius of the object-side surface of the second lens element is R3, a curvature radius of the image-side surface of the second lens element is R4, a curvature radius of the object-side surface of the third lens element is R5, and a curvature radius of the image-side surface of the third lens element is R6, the following relationships are satisfied: -1.5
URL and more information on this patent, see: Tsai, Tsung-Han; Chen, Wei-Yu. Photographing Lens Assembly. U.S. Patent Number 8786964, filed October 9, 2012, and published online on July 22, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=8786964.PN.&OS=PN/8786964RS=PN/8786964

Keywords for this news article include: Electronics, Semiconductor, Largan Precision Co. Ltd..

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Source: Electronics Newsweekly


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