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:
Nov. 02, 2004
Filed:
Mar. 19, 2003
Tzu-Kan Chen, Taipei, TW;
E-Pin Optical Industry Co., Ltd., Taipei, TW;
Abstract
An optical image pick-up lens is formed from crescent-shaped first and second lenses that may be aspherical molded glass lenses or aspherical plastic lenses. A convex surface at a first side of the first lens faces toward an object, and a convex surface at a second side of the second lens faces toward a formed image. The lens enables reduced lens length and high resolution by satisfying the following relational expressions: 0.4f≦d<0.9f; 0.5f≦|R3|≦100f; and 0.01<|f2|/|f1|<0.9; where, f is an overall focal length of the lens; d is a distance from the first side of the first lens to the second side of the second lens; R3 is a radius of curvature of an object side of the second lens; f1 is a focal length of the first lens; and f2 is a focal length of the second lens.