LIGHT DEFLECTING DEVICE

PURPOSE:To remove the mutual interference between an integrator and a phase compensating circuit even when the time constants of both the units are large, to increase servo gain and to improve responsibility by using a common servo loop for plural reflecting surfaces of a rotary polygon mirror to co...

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Bibliographic Details
Main Authors WANAMI HIDEKI, SUZUKI SEISUKE, YUI KOJI, SHIROKURA AKIRA
Format Patent
LanguageEnglish
Published 16.02.1988
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
PICTORIAL COMMUNICATION, e.g. TELEVISION
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Summary:PURPOSE:To remove the mutual interference between an integrator and a phase compensating circuit even when the time constants of both the units are large, to increase servo gain and to improve responsibility by using a common servo loop for plural reflecting surfaces of a rotary polygon mirror to correct face inclination. CONSTITUTION:Clock pulses generated from a clock generator 21 connected to a counter are sent to a face inclination variable detector 5 consisting of a CCD line sensor to drive the detector 5 and an obtained detecting signal is compared with a reference level VS1 by a comparator 23. The compared signal indicating the face inclination variable is latched by a latch circuit 24 and the latched signal is compared with a reference level VS2 by a comparator 26 through a D/A converter 25. The compared output is sent to an amplifier 27 by selecting an integrating circuit 42 and a phase compensating circuit 43 through switch groups 41, 44 to drive a correcting mechanism driving device 11.
Bibliography:Application Number: JP19860180784