Gradation control circuit for a thermal head

Details Gradation control circuit for a thermal head Gradation control circuit for a thermal head

1990-12-19

1992-08-25

Reinhart, Mark J.

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Thermal recording

358298, B41J 232

Patent

active

051423014

ABSTRACT:
A gradation control circuit for a thermal head used for printing an image or the like preferably includes a shift register for receiving gradation data, a selection circuit for selecting one gradation data corresponding to one exothermic element, a decision circuit for determining the level of the data, and a switching element for controlling the heating time of the exothermic element based on the determined level of the data.

REFERENCES:
patent: 4806950 (1989-02-01), Sekine et al.
patent: 4951152 (1990-08-01), Suzuki et al.
patent: 4963989 (1990-10-01), Morton
patent: 5006865 (1991-04-01), Kuroiwa

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