Enertec

Axiohm

Danfoss A/s

Bernard Mouchet

Sébastien Lafond

Claude Morelle

Alain Caillol

Beneath its line of heater points, the print head includes a film of thermoresistive material which is used for sensing temperature in the proximity of the heater points, thereby making it possible to obtain a signal which can be used quickly in regulating the quantity of energy delivered to each heater point, thereby making it possible to operate the points at a higher rate because they are subjected to excitation which is regulated.

Temperature sensing of heater points in thermal print heads by resistive

Method and device to supply, from a source of alternating voltage (5a or 5b), a thermal printing head (3) comprising a number of heater units (3a, 3b). The device comprises a means (6a to 6d) of obtaining a rectified voltage, a means (8) of detecting the points when the alternating voltage or the rectified voltage change to zero and to produce a detection signal, a means (9) of synchronizing, with this detection signal, the heating of particular heater units and a means (7a, 7b) to absorb current.

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Paris, France

Bernard Mouchet