Recorders – Printing – dotting – or punching marker – Ink transfer support or moving means
Patent
1991-04-08
1993-03-23
Reinhart, Mark J.
Recorders
Printing, dotting, or punching marker
Ink transfer support or moving means
358298, H04N 121
Patent
active
051968673
ABSTRACT:
The dynamic range of a continuous tone laser printer is extended by directly modulating a diode laser while simultaneously modulating the optical output of the diode laser with an acousto-optic modulator. The digital image value is input to two look-up tables (LUTs) that convert the image value to two digital words; one to set the power level of the diode laser, and the other to set the diffraction efficiency of the acousto-optic modulator (AOM). The first look-up table is constructed from the performance characteristics of the diode laser, and the second look-up table is constructed from the performance characteristics of the AOM. The look-up table digital outputs are applied to respective digital to analog converters whose analog outputs respectively drive a voltage to current driver for the diode laser and a radio frequency dirver for the AOM. The resulting power of the writing laser beam is a linear function of the input image value.
REFERENCES:
patent: 4379631 (1983-04-01), Kitamura
patent: 4577932 (1986-03-01), Coelbart
patent: 4783680 (1988-11-01), Maloney
patent: 4992804 (1991-02-01), Roe
Woo Nea-Yea
Yip Kwok-leung
Eastman Kodak Company
Noval William F.
Reinhart Mark J.
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