Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1995-09-12
1996-06-11
Group, Karl
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310348, 310358, 501 32, 252629R, H01L 4104, H01L 4108, H01L 4118, C03C 100
Patent
active
055258557
ABSTRACT:
A crystal oscillator unit which serves as a flat packaged piezoelectric device includes a base member, a quartz piece, and a cap member sealed air-tight to the base member to enclose the quartz piece in cooperation with the base member. Each of the base and the cap members is made of a glass-ceramic composite material in which 30 to 70% by weight of forsterite is dispersed in glass and which has a thermal expansion coefficient between 100.times.10.sup.-7 /.degree.C. and 150.times.10.sup.-7 /.degree.C. The glass consists, in percent by weight, essentially of 50 to 70% of SiO.sub.2, 3 to 15% of Al.sub.2 O.sub.3, 0 to 10% of ZnO, 0 to 8% of B.sub.2 O.sub.3, 7 to 25% of at least one member of CaO, SrO, and BaO, and 13 to 27% of at least one member of Na.sub.2 O, K.sub.2 O, and Li.sub.2 O. The glass and the forsterite are pulverized to an average particle diameter of 1 to 3 microns, mixed together with addition of fine powder of an average particle diameter of 0.1 to 1 micron of 0 to 5% by weight of at least one member of ZrO.sub.2, TiO.sub.2, SnO.sub.2, P.sub.2 O.sub.5, and MoO.sub.3, and sintered at a temperature between 800.degree. C. and 1000.degree. C.
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Gotoh Yoshihiro
Mikazuki Yoshinobu
Morisaki Yasutoshi
Group Karl
NEC Corporation
Troilo Louis M.
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