Recorders – Printing – dotting – or punching marker – Ink transfer support or moving means
Patent
1992-11-10
1994-01-18
Reinhart, Mark J.
Recorders
Printing, dotting, or punching marker
Ink transfer support or moving means
H04N 121, B41J 2435
Patent
active
052803066
ABSTRACT:
A main-scanning start point sensor detects a laser beam at a position outside of an effective main scanning region with respect to a photosensitive material, which is to be scanned with the laser beam produced by a semiconductor laser and is moving in a subscanning direction. A leading end sensor detects a leading end of the photosensitive material by detecting that the laser beam has been blocked by the leading end. Generators generate a first level driving signal, which sets an emission intensity of the semiconductor laser at a first level, and a second level driving signal, which sets the emission intensity at a second level lower than the first level. During a main scanning period, in which the laser beam can impinge upon the effective main scanning region, the second level driving signal and a modulating signal, which modulates the laser beam with an image signal, are fed into a semiconductor laser driving circuit respectively before and after the leading end is detected. During a main scanning period, in which the laser beam impinges upon the main-scanning start point sensor, the first level driving signal is fed into the semiconductor laser driving circuit.
REFERENCES:
patent: 4816924 (1989-03-01), Sekiya
patent: 4872065 (1989-10-01), Isono et al.
Fuji Photo Film Co. , Ltd.
Reinhart Mark J.
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