Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1996-02-27
1996-12-24
Phan, James
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359206, 359319, 250236, G02B 2610
Patent
active
055878261
ABSTRACT:
In an optical beam scanning apparatus having an electrooptic lens, a focal point of a light beam is adjusted to be exactly positioned on a scanning surface by a feedback control at any positions scanned by the light beam during a single scanning period. A deviation of a focal position of the light beam relative to the scanning surface is detected, and a detection signal corresponding to the deviation of the focal position is output. A focusing signal is stored and supplied which corresponds to the detection signal obtained when a focal position of the light beam is exactly positioned on the scanning surface. A differential signal is obtained as a difference between the focusing signal and the detection signal. A level of a driving voltage to be supplied to the electrooptic lens is controlled by a driving voltage controlling signal which is a sum of the differential signal and the focusing signal.
REFERENCES:
patent: 5033806 (1991-07-01), Tomita et al.
patent: 5124835 (1992-06-01), Shibaguchi et al.
patent: 5196697 (1993-03-01), Arimoto et al.
Phan James
Ricoh & Company, Ltd.
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