By a News Reporter-Staff News Editor at Electronics Newsweekly -- LARGAN PRECISION CO., LTD. (Taichung, TW) has been issued patent number 9316819, according to news reporting originating out of Alexandria, Virginia, by VerticalNews editors.
The patent's inventors are Hsu, Po-Lun (Taichung, TW); Chen, Wei-Yu (Taichung, TW); Hsueh, Chun-Che (Taichung, TW).
This patent was filed on November 15, 2012 and was published online on April 19, 2016.
From the background information supplied by the inventors, news correspondents obtained the following quote: "The present invention relates to an imaging lens system, and more particularly, to an imaging lens system used in electronic products and infrared photography.
"The demand for compact imaging lens assembly grows in recent years with the increasing popularity of portable electronic products with photographing function. The sensor of a general photographing camera is none other than CCD (Charge Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor) sensor. Furthermore, as the advanced semiconductor manufacturing technology has allowed the pixel size of the sensors to be reduced, and the current electronic products are leaning toward a trend of being more compact, there is an increasing demand for high quality imaging lens.
"On the other hand, the emerging motion capture technology applied in smart TV or motion sensing games also expands the application of compact imaging lens. The feature of these applications is by an infrared camera directly capturing the user's motion, the user takes control of the device intuitively; the experience of the motion sensing operation is elevated. Therefore, the demand for compact imaging lens operated in the infrared wavelength range has increased; what is more, lenses with wide viewing angle are even more welcome because they can extend the capturing range of the camera.
"In view of this, an imaging lens structure applied in slim and portable electronic devices is needed; on one hand, imaging lenses with this structure can be optimized for the requirement of ordinary photography (wide viewing angle, large aperture, image quality, etc.), on the other hand, lenses with this structure can be optimized for motion capture in the infrared wavelength range."
Supplementing the background information on this patent, VerticalNews reporters also obtained the inventors' summary information for this patent: "The present invention provides an imaging lens system, 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 at a paraxial region and a convex image-side surface at the paraxial region; a plastic second lens element with positive refractive power having a concave object-side surface at the paraxial region, a convex image-side surface at the paraxial region, and both of the object-side and image-side surfaces thereof being aspheric; and a plastic third lens element with negative refractive power having a concave object-side surface at the paraxial region, a concave at the paraxial region and convex at a peripheral region image-side surface, and both of the object-side and image-side surfaces thereof being aspheric; wherein the lens elements of the imaging lens system with refractive power are the first lens element, the second lens element, and the third lens element, a curvature radius of the object-side surface of the first lens element is R1, a curvature radius of the image-side surface of the first lens element is R2, a focal length of the first lens element is f1, a focal length of the second lens element is f2, and they satisfy the following relations: -0.5<(R1+R2)/(R1-R2)<1.0; and 1.65<f1/f2<5.0.
"In another aspect, the present invention provides an imaging lens system, 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 at a paraxial region and a convex image-side surface at the paraxial region; a plastic second lens element with positive refractive power having a concave object-side surface at the paraxial region, a convex image-side surface at the paraxial region, and both of the object-side and image-side surfaces thereof being aspheric; and a plastic third lens element with negative refractive power having a concave object-side surface at the paraxial region, a concave at the paraxial region and convex at a peripheral region image-side surface, and both of the object-side and image-side surfaces thereof being aspheric; wherein the lens elements of the imaging lens system with refractive power are the first lens element, the second lens element, and the third lens element, a c urvature radius of the object-side surface of the first lens element is R1, a curvature radius of the image-side surface of the first lens element is R2, a curvature radius of the object-side surface of the third lens element is R5, a focal length of the imaging lens system is f, and they satisfy the following relations: -0.5<(R1+R2)/(R1-R2)<1.0; and -1.33<R5/f<-0.55.
"In still another aspect, the present invention provides an imaging lens system, 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 at a paraxial region and a convex image-side surface at the paraxial region; a plastic second lens element with positive refractive power having a concave object-side surface at the paraxial region, a convex image-side surface at the paraxial region, and both of the object-side and image-side surfaces thereof being aspheric; and a plastic third lens element with negative refractive power having a concave at the paraxial region and convex at a peripheral region image-side surface, and both of the object-side and image-side surfaces thereof being aspheric; wherein the lens elements of the imaging lens system with refractive power are the first lens element, the second lens element, and the third lens element, the imaging lens system is used for optical wavelen gths ranging from 780 nm to 950 nm, a curvature radius of the object-side surface of the first lens element is R1, a curvature radius of the image-side surface of the first lens element is R2, and they satisfy the following relation: -0.5<(R1+R2)/(R1-R2)<1.0.
"In the aforementioned imaging lens system, the first lens element has positive refractive power to effectively distribute the refractive power of the second lens and helps to reduce the sensitivity of the imaging lens system. The second lens element has positive refractive power and provides the main refractive power of the system to control the total track length of the lens system effectively and avoid too large a volume of the lens system. The third lens element has negative refractive power and forms a positive-negative telephoto structure with the second lens element and can reduce the total track length of the imaging lens system effectively. With the aforementioned configuration, the present invention can reduce the total track length of the imaging lens system, increase the viewing angle of the lens system effectively, and facilitate the compact and wide-angle applications."
For the URL and additional information on this patent, see: Hsu, Po-Lun; Chen, Wei-Yu; Hsueh, Chun-Che. Imaging Lens System. U.S. Patent Number 9316819, filed November 15, 2012, and published online on April 19, 2016. 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=9316819.PN.&OS=PN/9316819RS=PN/9316819
Keywords for this news article include: Technology, Electronics, Semiconductor, LARGAN PRECISION CO. LTD..
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Source: Largan Precision : Patent Issued for Imaging Lens System (USPTO 9316819)
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