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US Patent 7815119 Monitoring scan mirror motion in laser scanning arrangements

Patent 7815119 was granted and assigned to Symbol Technologies on October, 2010 by the United States Patent and Trademark Office.

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Patent attributes

Current Assignee
Symbol Technologies
Symbol Technologies
Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
Patent Number
7815119
Date of Patent
October 19, 2010
Patent Application Number
11796151
Date Filed
April 26, 2007
Patent Primary Examiner
‌
Daniel A Hess
Patent abstract

Contamination in a feedback signal is eliminated in a laser scanning arrangement having a drive coil driven by a drive signal formed as a periodic train of drive pulses to oscillate a scan mirror and a light beam reflected from the scan mirror. A feedback coil generates a feedback signal during oscillation of the scan mirror, the feedback coil being in proximity with the drive coil and being subject to corruption by cross-coupling between the coils. The drive coil is not driven with at least one drive pulse during a quiet time period. Cross-coupling is eliminated by generating the feedback signal only during the quiet time period, and by monitoring a position of the scan mirror by processing the feedback signal which was generated only during the quiet time period.

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