Piezo-electric element and piezo-electric type acoustic device, and mfg. method therefor

Application Number: 00105206
Application Date: 2000.03.29
Publication Number: 1268861
Publication Date: 2000.10.04
Priority Information: 1999/11/30 JP 339392/99; 1999/3/29 JP 85285/99
International: H04R17/00
Applicant(s) Name: Taiyo Yuden Co., Ltd.
Inventor(s) Name: Kakinuma Hiromi;Kanai Yasuhiro;Takahashi Kenshi
Patent Agency Code: 11105
Patent Agent: tao fengbei
Abstract The invention relates to a piezoelectric vibrator and a piezoelectric sound device which can generate a more natural sound by enabling even a small-diameter piezoelectric vibrator to increase the low-frequency side sound pressure level. The piezoelectric vibrator has a couple of piezoelectric ceramic plates polarized in the thickness direction and inside electrodes and outside electrodes formed of conductor films formed on both surfaces of the piezoelectric ceramic plates respectively. The inside electrodes each on one side of each of the piezoelectric ceramic plates are laminated or stuck together in a mutually electrically conductive state while the polarizing directions of the piezoelectric ceramic plates are made opposite, and the outside electrodes are electrically connected to each other. This piezoelectric vibrator has its peripheral part fixed to the peripheral wall of a case main body with an elastic adhesive and thus built in the case main body.