The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 26, 2007
Filed:
Jul. 19, 2005
Chen-cheng Liao, Taichung, TW;
Chen-cheng Liao, Taichung, TW;
Asia Optical Co., Inc., Taichung, TW;
Abstract
A compact lens system includes, in succession from an object side to an image side, an aspheric first lens element () having a positive power, an aperture stop (), an aspheric second lens element () having a negative power, and a third lens element () having a positive power. Both the first and second lens elements are meniscus lenses made of plastic, and the third lens element is a biconvex lens or a plano-convex lens made of glass. The first lens element has a convex surface () facing the object side and an opposite concave surface () facing the aperture stop. The second lens element has a concave surface () facing the aperture stop and an opposite convex surface () curved toward the image side. The surface () of the third lens element facing toward the image side has a radius of curvature larger than that of the other surface () facing the second lens element.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile