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:
Dec. 02, 2014
Filed:
Feb. 08, 2013
National Chiao Tung University, Hsinchu, TW;
Jui-Wen Pan, Hsinchu, TW;
National Chiao Tung University, Hsinchu, TW;
Abstract
An optical device is to be disposed between a test screen and a test camera that captures an image on the test screen through the optical device. The optical device includes first, second, third and fourth lenses arranged from a camera side to a screen side in the given order. The first lens has a shape factor ranging from −10 to 5, the second lens is a positive lens and has a shape factor ranging from −15 to 2, the third lens is a positive lens and has a shape factor ranging from −30 to 1, and the fourth lens is a positive lens and has a shape factor ranging from −30 to 1. A ratio of a focal length of the optical device to that of the test camera ranges from 1 to 80.