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US 5,097,351 AGranted
Simultaneous multibeam scanning system
AssigneeHolotek Ltd.
InventorCharles J. Kramer
Life of this patent
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AssigneeHolotek Ltd.
InventorCharles J. Kramer
Estimating the term…
A dual, simultaneous beam scanning system for simultaneously scanning two individually modulated adjacent scan lines on an internal drum imaging surface uses a deflector which varies the angular orientation between combined orthogonally polarized beams so that one of the beams rotates about the other in synchronism with the angular position (the distance between start of scan) along the scan lines around the drum imaging surface. Signals from both a beam position sensing photodetector array and from a shaft encoder on the deflector unit, such as a Hologono deflector, controls the deflector of one of the orthogonally polarized beams so as to maintain the spacing and prevent crossovers of the adjacent scan lines and also reduce differential bow. Differential bow may be corrected both in the internal drum configuration and in a flat field imaging system using plural beam scanning. The scan lines can overlap so as to provide high resolution imaging at a rate of the order of hundreds of scan lines per second.
An internal drum scanning system for scanning an image surface disposed internally of a drum which comprises a deflector within said drum which rotates within said internal drum's imaging surface, means for providing polarized beams having different polarizations which are combined into co-propagating beams incident on said deflector to provide adjacent scan lines simultaneously as said deflector rotates within said imaging surface, means for deflecting one of said beams before it is combined with the other of said beams to provide said co-propagating beams, and means for synchronizing the deflection of said one beams with the rotation of said deflector for causing said one beam to rotate about said second beam, as the center of rotation of said first beam, to make the lines scanned by said beams across said imaging surface parallel to each other.
Dependencies are inferred from the claim text.