Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light
Patent
1997-04-09
2000-07-04
Le, N.
Incremental printing of symbolic information
Light or beam marking apparatus or processes
Scan of light
347234, 347239, 347255, 359285, 359312, 385 7, G02F 133
Patent
active
060846275
ABSTRACT:
An apparatus and method for controlling an image recording device. The apparatus includes an acousto-optic deflector that deflects a beam of light so as to write a sub-scan comprising a predetermined number of picture elements. The image recording device is arranged to write a plurality of sub-scans side by side in a substantially contiguous manner. The apparatus also includes a component that commences sub-scans, a start of sub-scan detector that detects when the light beam is directed towards a start of sub-scan position, and an end of sub-scan detector that detects when the beam of light is directed towards an end of sub-scan position. A timing logic controller generates a start reference signal representing a desired position for the start of a sub-scan. A controller compares an output of the start of sub-scan detector with respect to the start reference signal. The controller also adjusts a frequency range of a chirp applied to the acousto-optic deflector while keeping a start time of the chirp constant so as to cause an arrival time of the light beam at the start of sub-scan detector to coincide with the start reference signal. A picture element rate controller adjusts a rate at which picture elements are written such that a final one of the picture elements is written a predetermined period before the light beam is directed towards the end of sub-scan position.
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Cook Paul Christopher
Drewett Raymond John
Ogburn Alan Peter
ICG Limited
Le N.
Pham Hai C.
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