Laminated type semiconductor ceramic element and production...

Details Laminated type semiconductor ceramic element and production... Laminated type semiconductor ceramic element and production...

2005-06-28

2005-06-28

Mayes, Melvin C. (Department: 1734)

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

C156S089160

Reexamination Certificate

active

06911102

ABSTRACT:
A laminated type semiconductor ceramic element is provided with good PTC characteristics, low room temperature resistance value and improved withstand voltage of 15V or higher. Semiconductor ceramic layers made from a semiconductor ceramic containing barium titanate as the main component and the element nickel at about 0.2 mol % or less (excluding 0 mol %), and internal electrode layers are superimposed alternately, and an external electrode is formed so as to be connected electrically with the internal electrode layers. The production method comprises the steps of obtaining a laminated product of semiconductor material layers containing a barium titanate as the main component and about 0.2 mol % or less (excluding 0 mol %) of the element nickel, and internal electrode layers, obtaining a laminated sintered compact by reduction baking of the laminated product, forming an external electrode electrically connected with the internal electrodes of the laminated sintered compact, and re-oxidization processing.

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Japanese Office Action issed Apr. 22, 2003 (with English translation of relevant portion).
Japanese Office Action issed Dec. 24, 2002 (w/English translation of relevant portion).

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