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:
Jan. 05, 2010
Filed:
Oct. 31, 2007
Philip Jerome Heink, Lexington, KY (US);
Daniel Richard Klemer, Lexington, KY (US);
Stanley Coy Tungate, Jr., Lexington, KY (US);
Eric Wayne Westerfield, Versailles, KY (US);
Philip Jerome Heink, Lexington, KY (US);
Daniel Richard Klemer, Lexington, KY (US);
Stanley Coy Tungate, Jr., Lexington, KY (US);
Eric Wayne Westerfield, Versailles, KY (US);
Lexmark International, Inc., Lexington, KY (US);
Abstract
A laser driver comprises a plurality of current sources, including at least one bias current source and at least two drive current sources. To control the laser driver, a set of operating states is defined where each operating state corresponds to a desired laser output power level and a ratio is defined that establishes a relationship between a first desired laser output and a second desired laser output. A calibration operation samples laser output power of the laser source for less than all of the operating states, computes adjustments to the current levels of the current sources based at least in part upon the ratio such that sampled laser power levels converge towards their corresponding desired laser output level. The current sources are adjusted to their corresponding computed current levels.