Image forming apparatus and control method for reducing the requ

Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light

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347248, 399 52, 399212, H04N 104

Patent

active

058219773

ABSTRACT:
The invention provides an image forming apparatus which requires only a little standby time at the time of shifting from a standby state to a usual operation state, and accordingly can reduce the required processing time. In a copy machine 2 employed in the invention, a scanner CPU 121 generates a timing signal with a number of clocks substantially equal to the number of clocks of a horizontal synchronization signal, thereby performing shading correction of the output of a CCD line sensor 24 using a shading correction circuit 126. The scanner CPU 121 counts clocks CKS, each of which is obtained by dividing, using the divider 168, the frequency of a reference clock CK by a predetermined value, and outputs a pulse signal as the timing signal substantially in synchronism with the output of a horizontal synchronization signal when the number of counted clocks CKS reaches a predetermined value.

REFERENCES:
patent: 5107279 (1992-04-01), Yamamoto et al.
patent: 5241330 (1993-08-01), Kawabata et al.

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