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:
Mar. 17, 1998
Filed:
Jun. 30, 1995
Applicant:
Inventors:
Bradley N Suggs, Fremont, CA (US);
Ali Moayer, Fremont, CA (US);
Assignee:
Logitech, Inc., Fremont, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04N / ; H04N / ; H04N / ; H01J / ;
U.S. Cl.
CPC ...
358505 ; 358475 ; 358482 ; 358484 ; 358509 ; 358406 ; 250226 ;
Abstract
The present invention provides a combination of first providing a coarse adjustment by varying the emitter power and duration of the emitter/detector exposure time, and then providing a fine adjustment by storing a correction value for each photodetector element. The adjustment for each photodetector corrects not only for the range, but also for the offset, providing two correction values. In a preferred embodiment, the low and high voltage reference levels for an analog to digital converter are adjusted and stored for each photodetector for each color.