Electrical resistors – Resistance value responsive to a condition – Current and/or voltage
Patent
1998-10-13
2000-10-17
Donovan, Lincoln
Electrical resistors
Resistance value responsive to a condition
Current and/or voltage
338 25, H01C 710, H01C 713
Patent
active
061338214
ABSTRACT:
A PTC thermistor has a disk-shaped main body with electrodes on its main surfaces which are facing mutually away from each other such that, during an initial period after a potential difference is applied between these electrodes, the side surface of the main body has an asymmetric temperature distribution between the electrodes in the direction normal to its main surfaces. The heat emission does not have a peak half-way between the electrodes in the direction of the thickness such that the thermistor has an improved resistance against flash pressure. This may be done by forming the electrodes in different sizes or by providing a non-uniform distribution in specific resistance to the main body such that the heat-emission peak is displaced from the center region between the two main surfaces of the main body.
REFERENCES:
patent: 4259657 (1981-03-01), Ishikawa et al.
patent: 4904850 (1990-02-01), Claypool et al.
Patent Abstract of Japan 0511446 (no date).
Patent Abstract of Japan 08181004 (no date).
Database WP1; Section Ch, Week 8437; Derwent Publications Ltd., London, GB; Class L03, AN 84-228227; XP002091836 & JP 59 135703 A (no date).
Haga Takeo
Nabika Yasuhiro
Donovan Lincoln
Lee Richard K.
Murata Manufacturing Co. Ltd.
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