Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light
Reexamination Certificate
2006-01-17
2009-06-23
Meier, Stephen D (Department: 2853)
Incremental printing of symbolic information
Light or beam marking apparatus or processes
Scan of light
C347S246000, C347S250000, C399S301000, C358S001200
Reexamination Certificate
active
07551192
ABSTRACT:
A scanning time is divided by the number of sides of a polygon mirror to obtain a value N. Then, it is determined whether an error has occurred. When no error has occurred, the value N is stored in an NVRAM, and a magnification correction value is calculated. Values M and N of a PLL are set based on the correction value. A difference between a clock set by the PLL and an ideal pixel clock frequency is corrected to an optimal magnification by changing a phase. The ideal pixel clock frequency after magnification correction is calculated from V=N0/N×F. The values M and N of the PLL that provide a frequency closest to the ideal frequency V are acquired. A difference between a frequency V′ acquired from the values M and N and the ideal pixel clock frequency V is corrected by the clock phase.
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patent: 6833856 (2004-12-01), Maeda
patent: 2001/0019417 (2001-09-01), Ueki
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Al-Hashimi Sarah
Meier Stephen D
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Ricoh & Company, Ltd.
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