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:
Jul. 10, 2007
Filed:
Nov. 30, 2004
Hiroshi Chikugawa, Nara, JP;
Hiroshi Chikugawa, Nara, JP;
Sharp Kabushiki Kaisha, Osaka-shi, Osaka, JP;
Abstract
A pulse drive method for a light-emitting semiconductor devices having a plurality of light-emitting elements emitting light at different wavelengths and comprising first lit steps in which light-emitting element(s) of any of the emitted wavelengths is/are made to light as a result of being driven at drive setting(s) for each emitted wavelength, optical output(s) from the lit light-emitting element(s) is/are detected, and the light-emitting element(s) drive setting(s) is/are adjusted based on the detected light-emitting element optical output(s); and unlit steps in which the light-emitting elements of all of the emitted wavelengths are unlit for prescribed unlit time. The first lit steps are carried out in repeated fashion while the driven light-emitting element(s) is/are switched so as to cause the light-emitting element(s) to sequentially light in pulsed fashion in turn by emitted wavelength, and the unlit step respectively intervenes between each pair of successive iterations of the first lit steps.