Thermal recording apparatus capable of gradation recording

Details Thermal recording apparatus capable of gradation recording Thermal recording apparatus capable of gradation recording

1987-04-29

1988-09-27

Goldberg, E. A.

Recorders

Thermal recording

400120, 364519, 358298, G01D 1510

Patent

active

047745282

ABSTRACT:
A thermal recording apparatus includes a comparator for comparing the black density of picture elements to be recorded by thermal recording elements to reference density levels, a counter accumulates a value representing the number of picture elements having density levels in certain ranges as a result of the comparison by the comparator. The counter value is used to adjust the pulse width of pulses used to energize the recording elements to compensate for fluctuations in the levels of the pulses due to the number of recording elements that are energized at one time and the durations of the energizations in order to record visible images of the picture elements with appropriate densities.

REFERENCES:
patent: 4399749 (1983-08-01), Arai
patent: 4443121 (1984-04-01), Arai
patent: 4590487 (1986-05-01), Noguchi et al.

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