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:
Oct. 27, 2009
Filed:
Sep. 30, 2005
Costanzo Difazio, East Patchogue, NY (US);
Vladimir Gurevich, Stony Brook, NY (US);
James Giebel, Centerport, NY (US);
Gary G. Schneider, Stony Brook, NY (US);
Matthew Blasczak, Coram, NY (US);
Mark A. Weitzner, Plainview, NY (US);
Edward Barkan, Miller Place, NY (US);
Costanzo Difazio, East Patchogue, NY (US);
Vladimir Gurevich, Stony Brook, NY (US);
James Giebel, Centerport, NY (US);
Gary G. Schneider, Stony Brook, NY (US);
Matthew Blasczak, Coram, NY (US);
Mark A. Weitzner, Plainview, NY (US);
Edward Barkan, Miller Place, NY (US);
Symbol Technologies, Inc., Holtsville, NY (US);
Abstract
Laser power control arrangements interrupt power to a laser used in electro-optical readers upon detection of an over-power condition not conforming to preestablished regulatory standards. In one embodiment, during an operational mode, a difference between laser drive currents at two operating points is compared to a difference between laser drive currents at the same two operating points during a calibration mode. The over-power condition is recognized when the difference during the operational mode exceeds the difference during the calibration mode by a predetermined amount. In another embodiment, the laser is only energized to emit the beam at a reduced power level well below regulatory standards for staring at even if a motor drive failed.