Pulse drive circuit for bar code reader resonant oscillator
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United States of America Patent
Stats
-
Jan 16, 1996
Grant Date -
N/A
app pub date -
Sep 26, 1994
filing date -
Sep 26, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A bar code reader and the mirror oscillating system thereof are disclosed herein. The bar code reader is of the type which produces a scanning light beam by oscillating at least one mirror with a electromagnetic oscillator. The electromagnetic oscillator includes a winding which is energized with an alternating current signal produced based upon a position signal generated by a magnetic pickup. The position signal is representative of the location of the mirror. The position signal is amplified, phase-shifted, and assigned a duration based upon the difference between the desired angle of mirror oscillation and the actual angle of oscillation to produce the alternating current signal which is applied to the winding. When applied to the winding, the alternating current produces an alternating magnetic field which interacts with a permanent magnet fixed relative to the mirror to oscillate the mirror.
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