Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1989-12-18
1991-06-18
Miller, Jr., George H.
Facsimile and static presentation processing
Facsimile
Recording apparatus
346107R, 358302, H04N 121, G01D 1514
Patent
active
050253220
ABSTRACT:
A grey level non-impact recording apparatus and method provides data signals to a recording head having N recording elements per inch so that M sub-lines per inch can be recorded, wherein M is greater than N. In a specific example of a 400 dpi LED printhead, grey level data is sent to the printhead at a rate to record say 2400 lines per inch to provide a resolution of 400 dpi.times.2400 dpi grey level sub-pixels. Data from a data source may have a pixel resolution of 1/400".times.1/400" and the apparatus employs six sub-lines to record each of these pixels. The control for controlling the duration of recording of each LED for each sub-line includes a comparator which receives a grey level data signal at one input terminal and pulses representing a time changing count at another terminal. The count is produced by counter means and changes in response to signals from a clock means. Fine control over exposure, particularly at the "toe" of the exposure curve, is provided by a vernier-like clocking scheme wherein the counter means responds to alternate master clocks during recording of alternate sub-lines. The master clocks generate clock pulses at slightly different frequencies which thereby affect fine differences in the timing of the pulses from the counter means. In one embodiment the clock means may be a programmable non-linear clock and provides a greater range of grey level recording.
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Eastman Kodak Company
Miller Jr. George H.
Rogers Scott A.
Rushefsky Norman
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