Heat-sensitive resistance device

Patent metadata

Field	Value
Publication number	US-10072989-B2
Application number	US-201615079956-A
Country	US
Kind code	B2
Filing date	Mar 24, 2016
Priority date	Mar 27, 2015
Publication date	Sep 11, 2018
Grant date	Sep 11, 2018

Abstract

A device including: a paper film including cellulose fibers, a first surface, and a second surface opposite to the first surface; and at least one first heat-sensitive resistor having a negative temperature coefficient, the first heat-sensitive resistor including a first electrode arranged on the first surface, a second electrode arranged on the second surface, the first and second electrodes having at least first portions facing each other, the first heat-sensitive resistor further including the portion of the paper film arranged between the first portions facing each other. The invention also relates to a method of manufacturing such a device.

First claim

What is claimed is:

1. A device comprising:
a paper film comprising cellulose fibers, a first surface, and a second surface opposite to the first surface; and
at least one first heat-sensitive resistor of negative temperature coefficient, the first heat-sensitive resistor comprising a first electrode arranged on the first surface, a second electrode arranged on the second surface, the first and second electrodes having at least first portions facing each other, the first heat-sensitive resistor further comprising the portion of the paper film arranged between the first portions facing each other,
wherein an additive selected from the group comprising 2-2 diphenylethyl isocyanate, nitrophenyl isocyanate, 1-adanatyl isocyanate, and cyanophenyl isocyanate is grafted to the cellulose fibers of the paper film.

2. The device of claim 1 , wherein the paper film comprises at least 40% by weight of cellulose fibers.

3. The device of claim 1 , wherein the first heat-sensitive resistor further comprises a third electrode arranged on the first surface of the paper film, the second and third electrodes having at least second portions facing each other, the first heat-sensitive resistor further comprising the portion of the paper film arranged between the second portions facing each other.

4. The device of claim 1 , wherein the thickness of the paper film is in the range from 50 to 300 μm.

5. The device of claim 1 , comprising at least one second resistor comprising a resistive element on the first surface or on the second surface.

6. The device of claim 5 , wherein the first heat-sensitive resistor and the second resistor are assembled as a voltage-dividing bridge.

7. The device of claim 5 , comprising a Wheatstone bridge comprising two first heat-sensitive resistors and two second resistors.

8. A temperature sensor comprising the device of claim 1 .

9. A manufacturing method comprising the steps of:
a) providing a paper film comprising cellulose fibers, a first surface, and a second surface opposite to the first surface;
b) forming a first heat-sensitive resistor of negative temperature coefficient by forming a first electrode on the first surface, and a second electrode on the second surface, the first and second electrodes having at least first portions facing each other, the first heat-sensitive resistor further comprising the portion of the paper film arranged between the first portions facing each other,
further comprising the following successive steps d) and e), between step a) and step b):
d) dipping the paper film into a solution comprising at least one additive selected from the group comprising 2-2 diphenylethyl isocyanate, nitrophenyl isocyanate, 1-adanatyl isocyanate, and cyanophenyl isocyanate; and
e) grafting the additive to the cellulose fibers of the paper film.

10. The method of claim 9 , wherein step b) further comprises forming a third electrode on the first surface of the paper film, the second and third electrodes having at least second portions facing each other, the first heat-sensitive resistor further comprising the portion of the paper film arranged between the second portions facing each other.

11. The method of claim 9 , further comprising step c) of:
c) forming a second resistor by depositing a resistive paste on the first surface or on the second surface.

12. The method of claim 9 , wherein step e) comprises exposing the paper film to pulses of an ultraviolet radiation.

13. The method of claim 12 , wherein the pulses have a duration in the range from 0.5 to 2 ms and an energy fluence in the range from 5 to 20 J/cm2.

Assignees

• Commissariat Energie Atomique
• Commissariat A Ienergie Atomique Et Aux Energies Alternatives

Inventors

• Aliane Abdelkader

Classifications

• H01C1/1413

  Terminals or electrodes formed on resistive elements having negative temperature coefficient · CPC title

• H01C13/02

  Structural combinations of resistors · CPC title

• H01C7/041

  formed with two or more layers · CPC title

• H01C7/04

  having negative temperature coefficient · CPC title

• G01K7/24 Primary

  in a specially-adapted circuit, e.g. bridge circuit · CPC title