Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light
Patent
1995-09-28
1998-08-04
Wong, Peter S.
Incremental printing of symbolic information
Light or beam marking apparatus or processes
Scan of light
347235, 358409, 358434, 358410, H04N 1053
Patent
active
057901643
ABSTRACT:
A method and apparatus which writes image information into a memory and reads the image information out of the memory using different synchronizing signals. A first synchronizing signal which is used to write scanned image data into the memory is generated to have a predetermined regularity, for example using a clock signal. The second synchronizing signal is based on an output of a photosensor which detects laser light reflecting off a polygonal mirror and is based on the rotating speed of the motor. The image information in the memory is read out in synchronism with the writing of the image information by the laser beam and polygonal mirror onto the photoconductive element using the second synchronizing signal. Therefore, it is not necessary for the polygonal mirror and the motor driving the polygonal mirror to be at a predetermined stable speed during the scanning operation.
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Jardieu Derek J.
Ricoh & Company, Ltd.
Wong Peter S.
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