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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Is a

Patent

Patent attributes

Current Assignee

Symbol Technologies

Patent Jurisdiction

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.