Adjustment of dot size for laser imagers

Details Adjustment of dot size for laser imagers Adjustment of dot size for laser imagers

1996-03-06

1998-08-11

Reinhart, Mark J.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

395106, 358298, B41J 247

Patent

active

057934061

ABSTRACT:
Fine pulse width modulation (PWM) adjustments in the output of a laser printer are accomplished by receiving values from a bit map and modifying the values in accordance with values in a lookup table (LUT). The lookup table is subdivided into a plurality of blocks, and a selection of the blocks is made in accordance with external values. This allows the output of a pulse width modulation circuit to be adjusted to a precision that is greater than that afforded by the bit size of the values from the bit map. The use of plural blocks in the lookup table permits adjustments in the output of the pulse width modulation circuit in accordance with external factors such as relative humidity, sensitivity of an optical photoreceptor, and developer life.

REFERENCES:
patent: 5313308 (1994-05-01), Hasegawa et al.
patent: 5583644 (1996-12-01), Sasanuma et al.
patent: 5666470 (1997-09-01), Parker
patent: 5671003 (1997-09-01), Herczeg et al.

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