Multilayer positive temperature coefficient thermistor and...

Details Multilayer positive temperature coefficient thermistor and... Multilayer positive temperature coefficient thermistor and...

2004-09-13

2008-03-25

Lee, K. Richard (Department: 2832)

Electrical resistors

Resistance value responsive to a condition

Current and/or voltage

C338S307000, C257S528000, C361S311000

Reexamination Certificate

active

07348873

ABSTRACT:
A multilayer PTC thermistor reliably decreases the resistance by decreasing the thickness of ceramic layers composed of a BaTiO3semiconductor ceramic and achieves a resistance close to the resistance calculated from the multilayer structure. The thermistor is adjusted to satisfy the conditions 5≦X≦18 and 4≦X·Y≦10, wherein X is a thickness (μm) of each ceramic layer disposed between adjacent internal electrodes and Y is a donor content (%) in the barium titanate semiconductor ceramic constituting the ceramic layers, Y being expressed in terms of (number of donor atoms
umber of Ti atoms)×100.

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International Search Report issued in the corresponding International Application No. PCT/JP2004/013316, mailed on Dec. 21, 2004.

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