Apparatus for correcting scanning position in optical scanner

Details Apparatus for correcting scanning position in optical scanner Apparatus for correcting scanning position in optical scanner

1997-04-22

1998-08-25

Dzierzinski, Paul M.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359209, 359212, 359216, 347248, 347250, G02B 532, G02B 2608

Patent

active

057988510

ABSTRACT:
An optical scanner including a light source which is turned ON and OFF in accordance with drawing data. A hologram deflector, made of a rotatable planar hologram disc, provided with a plurality of hologram facets through which light emitted from the light source passes, is rotated to scan an image surface with light emitted from the light source. An optical detector detects light passing in a scanning direction through at least a first reference point, for the commencement of the scanning, and a second reference point, for the completion of the scanning. A scanning time detector detects a scanning time period in which the light deflected by each hologram facet of the hologram disc, passes the first reference point and reaches the second reference point. Finally, a frequency varying device varies the frequency of the light source for each hologram facet in accordance with a unique scanning time period directed by the scanning time detector for each hologram facet.

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