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US 4,621,261 AGranted
System for making a thermo-active device temperature dependent
AssigneeThomson-CSF
InventorsRobert Hehlen, Philippe Marcenac
Life of this patent
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Abstract
A system for making a device temperature dependent whose operation is dependent on the local heating applied to a thermo-active material layer. The invention uses the heating electrodes of the device as temperature sensors, the information detected by these sensors being stored in a memory and used as bases for establishing the temperature dependence.
Claims10
A temperature-dependent addressing system comprising:
- a temperature-dependent device whose operation depends on the local heating applied to a layer of thermo-active material;
- means for producing said local heating, including an assembly of electrodes and a means for passing a transitory electric current through one of said electrodes wherein said assembly of electrodes are situated in the immediate vicinity of said layer;
- a memory means containing data pertaining to the thermal control of said electrodes;
- a means for thermally addressing said one electrode as a function of said data wherein each one of said assembly of electrodes comprises a conducting material having a temperature coefficient;
- a resistance r connected to the output of said electrode wherein at least a portion of said heating current passes through said resistance r, and whereby the potential difference v appearing at the terminals of said resistance r is proportional to the heating of said one electrode;
- an analogue-digital converter which transmits for each of said heating electrodes, said potential difference v to one of the inputs of a comparator wherein the second input of said comparator receives said data relative to the thermal control of said electrode;
- circuit means for adjusting the heating time of said electrode wherein said circuit means is connected to the output of said comparator.
4 more elements
Dependencies are inferred from the claim text.