Abstract: 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.

Abstract: 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.

Abstract: A level measuring probe for a liquid contained in a reservoir of the type having a detecting element constituted by a conductor having a high temperature coefficient and intended to be immersed in the liquid; and an electrical connection means intended to permit connection of the said detector element to a connector; a plurality of printed circuits disposed in respective parallel strips are provided on an insulating substrate, the assembly forming a flexible film and each circuit having a detecting zone and an electrical connection zone; the film is assembled to a support of, for example, stainless steel; the assembly is out at the edges of the parallel strips.