Positive temperature coefficient semiconductor heating element
AssigneeMurata Manufacturing Co., Ltd.
InventorsMinoru Tamada, Takashi Shikama, Toshikazu Nakamura
Life of this patent
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Abstract
An arrangement of electrode for positive temperature coefficient semiconductor (PTCS) for use in heating and drying devices and the like, which PTCS is provided with a pair of electrode plates, each having a fork-like configuration with a plurality of branches or fingers in the form of strips extending forward from its base. The strips of both electrodes are disposed alternately on one of the opposing planes of the PTCS body. Each electrode has an extended portion serving as terminal which is bonded on the other plane of the PTCS body in such a manner that the terminal is not confronted, through the PTCS body, with any strips of opposite electrode.
Claims12
A positive temperature coefficient semiconductor (PTCS) heating element comprising:
- (a) a PTCS body having two opposite flat and mutually parallel faces;
- (b) a first electrode having a plurality of strips of metal film electrically connected to each other at its one end and being separated from each other along their respective length with at least one of said strips being shorter than other strips and said first electrode being provided on an upper face of said two faces of said PTCS body;
- (c) a second electrode having a plurality of strips of metal film electrically connected to each other at its one end and being separated from each other along their respective length with at least one of said strips being shorter than other strips and said second electrode being provided on said upper face in such a manner that the strips of opposite electrodes are alternately disposed on said upper face so that neighboring strips of respective strips are members of opposite electrode;
- (d) a first terminal of a pair of terminals for applying predetermined voltage, said first terminal being electrically connected to said first electrode and provided on a bottom face of said two faces at such a position that said first terminal does not overlap, through the PTCS body, with any of the strips of said second electrode;
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- (e) a second terminal of said pair of terminals, said second terminal electrically connected to said second electrode and provided on said bottom face at such a position that said second terminal does not overlap, through the PTCS body, with any of the strips of said first electrode.
A positive temperature coefficient semiconductor (PTCS) heating element comprising:
- (a) a PTCS body having two opposite flat and mutually parallel faces;
- (b) a first electrode having a plurality of strips of metal film electrically connected to each other at its one end and being separated from each other along their respective length with at least one of said strips being shorter than other strips and said first electrode being provided on an upper face of said two faces of said PTCS body;
- (c) a second electrode having a plurality of strips of metal film electrically connected to each other at its one end and being separated from each other along their respective length with at least one of said strips being shorter than other strips and said second electrode being provided on said upper face in such a manner that the strips of opposite electrodes are alternately disposed on said upper face so that neighboring strips of respective strips are members of opposite electrode;
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- (d) a pair of terminals for applying predetermined voltage between said first and second electrodes, each of said pair of terminals being electrically connected to said first and second electrodes, respectively, and provided on a bottom face of said two faces at such a position that at least one of said pair of terminals does not overlap, through the PTCS body, with any of the strips of opposite electrode.
Dependencies are inferred from the claim text.