PTC RESISTOR PACKAGE

• US 3,835,434 A
• Filed: 06/04/1973
• Issued: 09/10/1974
• Est. Priority Date: 06/04/1973
• Status: Expired due to Term

• Current Assignee: Manfred Kahn
• Original Assignee: Manfred Kahn
• Inventors: Kahn, Manfred
• Primary Examiner(s): Albritton, C. L.
• Application Number:
  US05/366,931
• Time in Patent Office: 463 Days
• Field of Search: 338/22,23,24,25 317/40,41 29/612,613
• US Class Current: 338/22.00R
• CPC Class Codes: H01C 1/1406 Terminals or electrodes formed on resistive elements having positive temperature coefficient
• CPC Class Codes: H01C 7/022 mainly consisting of non-metallic substances H01C7/021 takes precedence
• CPC Class Codes: H01C 7/04 having negative temperature coefficient thermometers using resistive elements G01K7/16
• CPC Class Codes: Y10T 29/49087 with envelope or housing

Abstract

A PTC resistor body is metallized on two opposite and parallel surfaces. The body is sandwiched between two paddle-shaped metal plates making intimate electrical and thermal contact therewith. The handle-shaped portions of the plates extend radially from the package and serve as press-on-type terminals. This assembly is further sandwiched between broad thin layers of insulative material. This double sandwich structure is held in the recess of a hat-shaped metal bracket to which the top insulation layer is adhered. The bottom insulation layer adheres to a metal disc that is approximately flush with the brim portion of the metal bracket.

Claims

1. A PTC resistor package comprising:

a. a PTC resistor body having two essentially parallel surfaces, the area of said two parallel surfaces taken together being greater than half the total surface area of said PTC resistor body;

b. first and second electrodes each lying adjacent to and in intimate thermal and electrical contact with essentially the entire area of one of said surfaces;

c. first and second insulative layers lying adjacent to and in intimate thermal contact with the outer sides of said first and second electrodes, respectively;

d. a metal housing having a cavity into which said PTC resistor body is fitted, said first and second insulative layers lying adjacent to and in intimate thermal contact with two inner faces, respectively, of said metal housing, such that said layers provide electrical insulation and intimate thermal contact between each of said electrodes and said housing; and

e. connective means for mounting and making thermal connection between said housing to a flat surface or an object whose temperature is to be regulated or sensed.

2. The package of claim 1 wherein the area of contact between each said insulative layer and said adjacent metal housing is substantially greater than the area of contact between each said insulating layer and said adjacent electrode.

3. The package of claim 1 wherein each of said electrodes is comprised of a metal film deposited on one of said parallel surfaces, and a metal plate lying adjacent thereto in intimate thermal and electrical contact with said film.

4. The package of claim 3 wherein said metal plates have extended portions that extend radially from said package, being suitable for connection by standard press-on electrical connectors.

5. The package of claim 3 wherein said intimate thermal and electrical contact between said metal plate and said metal film is achieved by a reflowed solder connection therebetween.

6. The package of claim 3 further comprising a means for causing a compressive force between each said metal plate and said intimately contacting metal film, whereby said thermal and electrical contact is achieved therebetween.

7. The package of claim 3 wherein said PTC body is cylindrical and wherein a portion of each said plate has a circular shape being concentrically positioned with respect to said cylindrical body, said circular portion of said plate having a larger diameter than that of said cylindrical body.

8. The package of claim 7 wherein the periphery of said circular portion of said plate is flared and the shallow cup thus formed partially contains said body.

9. The package of claim 1 wherein said metal housing is comprised of a sheet metal part having a hat shape in profile;

and a sheet metal disc shaped part, said hat shaped part containing said body, the brim portions of said hat shaped part being approximately in the same plane as said disc shaped part, such that said package may be connected by said brim portion and thus mounted in intimate thermal contact with a flat portion of a machine.

10. The package of claim 9 wherein said means comprises said brim portion of said housing having a plurality of holes therein for fastener mounting to said flat surface of said object.