News Column

Patent Application Titled "Photographing Lens Assembly" Published Online

May 7, 2014



By a News Reporter-Staff News Editor at Electronics Newsweekly -- According to news reporting originating from Washington, D.C., by VerticalNews journalists, a patent application by the inventors Tsai, Tsung-Han (Taichung City, TW); Chen, Wei-Yu (Taichung City, TW), filed on December 10, 2012, was made available online on April 24, 2014.

The assignee for this patent application is Largan Precision Co., Ltd.

Reporters obtained the following quote from the background information supplied by the inventors: "The present invention relates to a photographing lens assembly. More to particularly, the present invention 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.

"Most of the conventional compact lens systems adopt a two-lens element structure for cutting down the manufacturing cost, such as the optical lens system with two-lens element structure disclosed in U.S. Pat. No. 7,525,741 B1. However, as the optical lens system only has two lens elements, the aberration correction ability of the system is limited, and the system fails to satisfy higher imaging demands. On the other hand, other conventional optical lens systems with four-element lens structure such as the one disclosed in U.S. Pat. No. 8,039,704 B2 are provided. However, a compact size thereof is limited by the number of the lens elements, and the manufacturing costs rise relatively as the manufacturing and assembling processes are more complicated and difficult.

"U.S. Pat. No. 7,397,612 B2 provides an optical lens system with three-element lens structure which comprises, in order from an object side to an image side, a first lens element with negative refractive power, a second lens element with positive refractive power, and a third lens element with positive refractive power. Although the field of view can be increased by such an optical lens system, the back focal length is also increased. The total track of length is thereby too long and therefore is not applicable to compact electronic products. Since the surface curvatures have limited ability in correcting the aberration and distortion, it is thereby not favorable for the imaging quality. Besides, the conventional optical lens systems are not suitable to be applied to the infrared photography, since these systems cannot be applied to detect infrared rays at night under the circumstance of insufficient light source or to capture the dynamic images."

In addition to obtaining background information on this patent application, VerticalNews editors also obtained the inventors' summary information for this patent application: "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 concave at a paraxial region thereof and an image-side surface being convex at a paraxial region thereof. The second lens element has positive refractive power. The third lens element with negative refractive power is made of plastic material, and has an image-side surface being concave at a paraxial region thereof and being convex at a peripheral region thereof, wherein an 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 first lens element is R1, a curvature radius of the image-side surface of the first lens element is R2, and an f-number of the photographing lens assembly is Fno, the following relationships are satisfied:

"1.0<(R1+R2)/(R1-R2)

"1.5
BRIEF DESCRIPTION OF THE DRAWINGS

"FIG. 1 is a schematic view of a photographing lens assembly according to the 1st embodiment of the present disclosure;

"FIG. 2 shows spherical aberration curves, astigmatic field curves and a distortion curve of the photographing lens assembly according to the 1st embodiment;

"FIG. 3 is a schematic view of a photographing lens assembly according to the 2nd embodiment of the present disclosure;

"FIG. 4 shows spherical aberration curves, astigmatic field curves and a distortion curve of the photographing lens assembly according to the 2nd embodiment;

"FIG. 5 is a schematic view of a photographing lens assembly according to the 3rd embodiment of the present disclosure;

"FIG. 6 shows spherical aberration curves, astigmatic field curves and a distortion curve of the photographing lens assembly according to the 3rd embodiment;

"FIG. 7 is a schematic view of a photographing lens assembly according to the 4th embodiment of the present disclosure;

"FIG. 8 shows spherical aberration curves, astigmatic field curves and a distortion curve of the photographing lens assembly according to the 4th embodiment;

"FIG. 9 is a schematic view of a photographing lens assembly according to the 5th embodiment of the present disclosure;

"FIG. 10 shows spherical aberration curves, astigmatic field curves and a distortion curve of the photographing lens assembly according to the 5th embodiment;

"FIG. 11 is a schematic view of a photographing lens assembly according to the 6th embodiment of the present disclosure;

"FIG. 12 shows spherical aberration curves, astigmatic field curves and a distortion curve of the photographing lens assembly according to the 6th embodiment;

"FIG. 13 is a schematic view of a photographing lens assembly according to the 7th embodiment of the present disclosure;

"FIG. 14 shows spherical aberration curves, astigmatic field curves and a distortion curve of the photographing lens assembly according to the 7th embodiment;

"FIG. 15 is a schematic view of a photographing lens assembly according to the 8th embodiment of the present disclosure;

"FIG. 16 shows spherical aberration curves, astigmatic field curves and a distortion curve of the photographing lens assembly according to the 8th embodiment;

"FIG. 17 is a schematic view of a photographing lens assembly according to the 9th embodiment of the present disclosure;

"FIG. 18 shows spherical aberration curves, astigmatic field curves and a distortion curve of the photographing lens assembly according to the 9th embodiment;

"FIG. 19 is a schematic view of a photographing lens assembly according to the 10th embodiment of the present disclosure;

"FIG. 20 shows spherical aberration curves, astigmatic field curves and a distortion curve of the photographing lens assembly according to the 10th embodiment; and

"FIG. 21 shows the SAG21 of the second lens element of the photographing lens assembly as illustrated in FIG. 1."

For more information, see this patent application: Tsai, Tsung-Han; Chen, Wei-Yu. Photographing Lens Assembly. Filed December 10, 2012 and posted April 24, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=4574&p=92&f=G&l=50&d=PG01&S1=20140417.PD.&OS=PD/20140417&RS=PD/20140417

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

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Source: Electronics Newsweekly


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