Laser power control for cut-paper printer

Details Laser power control for cut-paper printer Laser power control for cut-paper printer

1989-01-03

1990-03-13

Reynolds, Bruce A.

Recorders

Printing, dotting, or punching marker

Ink transfer support or moving means

358296, 358300, 346160, G01D 1514

Patent

active

049086340

ABSTRACT:
Electric-photosensitive printing is accomplished with an LD providing a laser scanning beam that is modulated to affect printing, and the power output of the LED is maintained constant through negative feedback by a holding voltage provided by a capacitor having its charge determined only during a non-printing portion of the printing period wherein a plurality of sheets are printed. During the non-printing period, contact of the scanning laser beam with the electro-photosensitive material is disabled while the laser beam is maintained on so that its power may be measured and compared with a reference level to provide a feedback signal for controlling the output of the laser beam, particularly the feedback signal being provided to the holding capacitor only during the non-printing portion of the period, and the holding capacitor being isolated from the feedback signal during the printing portion of the period. As a specific embodiment, a rectangular sheet of electric-photosensitive material is replaceable wound around a drum so that its opposite ends are spaced apart to provide a seam to affect the disablement of the laser beam from contracting the electro-photosensitive material during the non-printing portion of the period, and a separate light source used to detect this seam portion to determine the non-printing portion of the period.

REFERENCES:
patent: 4122409 (1978-10-01), Marlett et al.
patent: 4742363 (1988-05-01), Shiraishi

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