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. 15, 2009
Filed:
May. 10, 2006
Applicants:
Sheng-yeh Lai, Hsin Chu, TW;
Ming-hui Kuo, Hsin Chu, TW;
Inventors:
Sheng-Yeh Lai, Hsin Chu, TW;
Ming-Hui Kuo, Hsin Chu, TW;
Assignee:
Pixart Imaging Incorporation, Hsin-Chu, TW;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G09G 5/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A computer input apparatus is disclosed which has improved safety control. The computer input apparatus includes a calibration circuit to control the operation current of a coherent light source to be above a minimum threshold required for normal operations, but below an upper threshold for safety reason. The computer input apparatus includes a fault detection circuit to monitor fault conditions. When this computer input apparatus employs a coherent light source, it does not require any optical lens to diminish optical power.