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:
May. 19, 2009
Filed:
Jun. 04, 2007
Frank Check, San Jose, CA (US);
Frank Check, San Jose, CA (US);
Metrologic Instruments, Inc., Blackwood, NJ (US);
Abstract
A diffractive-based laser scanning system that monitors portions of the laser light beams generated by a laser light source (e.g., VLD) employed therein to generate a mode switching signal indicative of a shift in the characteristic wavelength of the laser light beams emitted from the laser light source. In response thereto, a temperature controller selectively heats or cools the laser light source to minimize and avoid such wavelength changes. Mode switching is detected by monitoring a zeroth diffractive order beam produced by a diffractive element of the system. Temperature control of the laser light source is accomplished using active heating elements and passive cooling elements in thermal contact with the laser light source. In addition, temperature control of the laser light source is preferably accomplished over a heating range, whereby temperature within this range is approximated by a look-up table.