Adaptive corrector of facet errors in mirror scanning systems

G - Physics – 02 – B

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88/96.8

G02B 27/00 (2006.01) G06K 15/12 (2006.01) H04N 1/047 (2006.01) H04N 1/113 (2006.01) H04N 1/12 (2006.01)

Patent

CA 1199823

ABSTRACT A beam deflection system is provided with electrical circuitry for adaptively correcting the deflection of a beam of radiant energy in a scanning system incorporating a rotating scanning mirror to compensate for misalignment in facets of the mirror. With the use of an acousto-optic modulator providing a deflected beam at an angle dependent on the frequency of an acoustic drive signal, the orientation of the beam can be altered to compensate for the mis- aligned facets by varying the acoustic frequency. A sensor and bridge circuit signal the position of a beam scan. A memory stores the value of the frequency for scans by each facet, the value being altered with each scan to optimize the frequency. A drift compensation circuit provides for an averaging of the parameter values, and provides a voltage to adjust the balance of the bridge to drive the average value towards a reference value.

415221

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