Modulation circuit for grayscale laser printing

Details Modulation circuit for grayscale laser printing Modulation circuit for grayscale laser printing

1991-05-31

1992-12-08

Scott, Jr., Leon

Coherent light generators

Particular beam control device

Modulation

372 38, H01S 310

Patent

active

051704030

ABSTRACT:
A laser diode modulation circuit for grayscale laser printing provides variable control for both the current through the laser diode and the modulation (switching) of the diode in time. The size of a printed area within a pixel region is determined in two dimensions by the power output of the laser diode and the modulation of the laser diode within the pixel region. The power output of the laser diode is detected with a photodiode detector which is part of a feedback loop for adjusting the maximum bias current value of the diode. The maximum bias current value is held as a digital value with a digital counter, and is adjusted by incrementing or decrementing the counter. A drive current for the laser diode is selected for each pixel as a percentage of the maximum bias current value using an analog multiplexer. A modulation signal is generated in response to modulation information received, and controls the switching of the laser diode within a pixel region.

REFERENCES:
patent: 5073331 (1991-12-01), Shirasaki
patent: 5089727 (1992-02-01), Molitor et al.

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