Laminated piezoelectric element

Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices

Reexamination Certificate

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Reexamination Certificate

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07061162

ABSTRACT:
A laminated piezoelectric element (1) having a ceramic laminate (10) formed by alternatively laminating a plurality of piezoelectric layers (11) and a plurality of internal electrode layer (21). A side surface (101) provided with the first side-surface electrode (31) is further provided with first recessed groove portions (41) which are the recessed grooves exposing the ends of the second internal electrodes (22) in the bottom portions (410) thereof, and a side surface (102) provided with the second side-surface electrode (32) is further provided with second recessed groove portions (42) which are the recessed grooves exposing the ends of the first internal electrodes (21) in the bottom portions. The first groove portions (41) and the second groove portions (42) are filled with an insulating filler material (5) having electrically insulating property so as to cover the ends of the second internal electrodes (22) and the ends of the first internal electrodes (21). The insulating filler material (5) comprises an insulating resin (50) having electrically insulating property and inorganic particles (51) of an inorganic material contained in the insulating resin (50).

REFERENCES:
patent: 4978881 (1990-12-01), Wakita et al.
patent: 5163209 (1992-11-01), Harada et al.
patent: 5175465 (1992-12-01), Um et al.
patent: 5233260 (1993-08-01), Harada et al.
patent: 5245734 (1993-09-01), Issartel
patent: 6700306 (2004-03-01), Nakamura et al.
patent: 2001-69771 (2001-03-01), None
patent: 2001-77436 (2001-03-01), None
patent: 2001-102647 (2001-04-01), None
patent: 2001-244513 (2001-09-01), None
patent: 2002-111088 (2002-04-01), None

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