Dot print density regulating circuit

Details Dot print density regulating circuit Dot print density regulating circuit

1990-08-20

1992-03-24

Fuller, Benjamin R.

Recorders

Thermal recording

G01D 1510

Patent

active

050992589

ABSTRACT:
In order to avoid density variation due to difference of a print dot rate in a line printer for printing an image and character, a data transfer circuit operates to convert image data inputted through a buffer memory into a plurality of serial data trains. The serial data trains are fed to corresponding shift registers of a print head. The data transfer circuit is also connected to a selecting gate circuit in the form of a demultiplexer. The demultiplexer operates to cyclicly sample the plurality of serial data trains outputted from the data transfer circuit. A counter counts a number of print dots contained in the sampled data so as to measure a print dot rate. A drive pulse width is adjusted according to the print dot rate so as to avoid variation of print density due to difference of the print dot rate.

REFERENCES:
patent: 4661703 (1987-04-01), Ishikawa et al.
patent: 4777536 (1988-11-01), Kato

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