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. 17, 2002
Filed:
Oct. 18, 2000
Harry J. McIntyre, Los Angeles, CA (US);
Xerox Corporation, Stamford, CT (US);
Abstract
A laser driver uses a switch, a current mirror, a control transistor and two current generators to control the ON and bias currents in a laser diode. In the bias mode the current from one generator is shared by one half of the current mirror and the adjustable control transistor. The other current generator then drives the other half of the mirror circuit and the laser diode in parallel, resulting in the laser diode getting the same amount of current that the control transistor gets. In the ON mode, the switch cuts off the first half of the current mirror, which is mirrored in the other half, so that all of the other generator current is used in the laser diode. The current drivers are adjustable to the ON current and the control transistor current is adjustable to the bias current.