News Column

Patent Issued for Optical Photographing Lens System

June 18, 2014

By a News Reporter-Staff News Editor at Electronics Newsweekly -- Largan Precision Co., Ltd. (Taichung, TW) has been issued patent number 8743477, according to news reporting originating out of Alexandria, Virginia, by VerticalNews editors.

The patent's inventors are Tsai, Tsung-Han (Taichung, TW); Huang, Hsin-Hsuan (Taichung, TW).

This patent was filed on December 12, 2012 and was published online on June 3, 2014.

From the background information supplied by the inventors, news correspondents obtained the following quote: "The present invention relates to an optical photographing lens system. More particularly, the present invention relates to a compact optical photographing lens system applicable to the 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.

"Imaging lenses used in vehicle cameras, security surveillance cameras or electronic game devices typically require a larger field of view to capture an image of a larger area at one time. Generally, a conventional imaging lens assembly with a large angle of view, such as the five-element lens assembly disclosed in U.S. Pat. No. 8,248,713, is a negative-positive structure, thereby forming an inverse telephoto structure to achieve a wide field of view. While such arrangement facilitates the enlargement of the field of view, the image resolving power is insufficient and the total track of length is not easy to be reduced.

"Although other conventional imaging lens assembly with six-element lens structure is favorable for improving the image resolving power, such as the one disclosed in U.S. Publication No. 2012/0188654. However, the two lens elements of the imaging lens assembly closest to the object side are not configured as the traditional one with negative refractive power and the other with greater positive refractive power, so that the back focal length of imaging lens assembly cannot be reduced. As a result, although it is favorable for reducing the total track of length, it is not favorable for enlarging the field of view to capture an image of a larger area at one time."

Supplementing the background information on this patent, VerticalNews reporters also obtained the inventors' summary information for this patent: "According to one aspect of the present disclosure, an optical photographing lens 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 negative refractive power has a convex object-side surface and a concave image-side surface. The second lens element has positive refractive power. The third lens element has refractive power. The fourth lens element has refractive power, wherein at least one surface of the fourth lens element is aspheric. The fifth lens element with positive refractive power has a convex image-side surface and both of the surfaces are aspheric. The sixth lens element with negative refractive power has an image-side surface changing from concave at a paraxial region to convex at a peripheral region, and both of the surfaces are aspheric. When a focal length of the optical photographing lens system is f, a focal length of the second lens element is f2, a curvature radius of the object-side surface of the fifth lens element is R9, and a curvature radius of the image-side surface of the fifth lens element is R10, the following relationships are satisfied: 0
For the URL and additional information on this patent, see: Tsai, Tsung-Han; Huang, Hsin-Hsuan. Optical Photographing Lens System. U.S. Patent Number 8743477, filed December 12, 2012, and published online on June 3, 2014. Patent URL:

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

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Source: Electronics Newsweekly

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