Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2000-01-28
2002-06-18
Sircus, Brian (Department: 2839)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C310S340000
Reexamination Certificate
active
06407485
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a piezoelectric vibrator for use in devices such as portable telephones and portable information terminals.
As a conventional piezoelectric vibrator, there is known, for example, a structure shown in
FIG. 8
having oscillation electrode films
63
for vibrating piezoelectric vibration pieces having one end connected to lead electrodes
62
provided on upper and lower surfaces of a piezoelectric vibration plate
61
integrally formed with a piezoelectric vibration piece and a frame portion, and a pair of lid members
66
bonded through bonding materials
64
on the oscillation electrode films
63
and each having a recess
65
defining such a degree of a space as not to prevent vibration of the piezoelectric vibration pieces.
In such a piezoelectric vibrator, generally the oscillation electrode films
63
are respectively extended from different longitudinal ends of the piezoelectric vibration plate
61
to a side surface and connected to lead electrodes
62
. This lead electrode
62
is extended to a surface of one lid member
66
.
However, in the above construction, a gap occurs between the piezoelectric vibration plate
61
and the lid member
66
at the vicinity of the lengthwise end of the piezoelectric vibration plate
61
on a surface opposite to a side from which the oscillation electrode film
63
extends. Due to this, a space A is formed at an inner side of the lead electrode
62
. There is a problem that in this portion the lead electrode
62
is low in strength and hence there is a high possibility of disconnection.
The present invention has been made in view of such a circumstance, and it is an object to provide a piezoelectric vibrator in which the possibility of disconnection of a lead electrode is lowered and its reliability is improved.
SUMMARY OF THE INVENTION
In first form of the invention for solving the object, a piezoelectric vibrator comprises a piezoelectric vibration plate having a piezoelectric vibration piece and a frame portion connected integrally with a base portion thereof and surrounding the piezoelectric vibration piece; a pair of oscillation electrodes provided on opposite surfaces of the piezoelectric vibration plate to vibrate the piezoelectric vibration plate; and a pair of lid members which are bonded through bonding films and which are connected to face each of the oscillation electrodes for hermetically sealing the piezoelectric vibration piece without interfering vibration thereof; the pair of oscillation electrodes has a first electrode formed on a first one of the opposite surfaces of the piezoelectric vibration plate and extending lengthwise to one end of the piezoelectric vibration plate on the first surface, and a second electrode formed on the other of the opposite surfaces of the piezoelectric vibration plate and extending lengthwise to another end of the piezoelectric vibration plate on the second surface; and wherein at least one of the electrodes extends from one of the surfaces to the opposite surface of the piezoelectric vibration plate through a side surface of the end.
In a second form of the invention, the one pair of oscillation electrodes of both electrodes are extended to a surface on an opposite side through an end side surface on an extension side.
In a third form of the invention, the one pair of oscillation electrodes at lengthwise both ends are connected with face to face each lead electrode extended to a surface of the lid member on a side that at least one electrode is extended to a surface on an opposite side of the piezoelectric vibration plate.
In the invention as described above, it is possible to prevent disconnection of the lead electrode.
REFERENCES:
patent: 4421621 (1983-12-01), Fujii et al.
patent: 5502344 (1996-03-01), Yoshimoto et al.
patent: 5585687 (1996-12-01), Wakabayashi et al.
patent: 5920142 (1999-07-01), Onishi et al.
patent: 6163101 (2000-12-01), Yoshida et al.
Adams & Wilks
Seiko Instruments Inc.
Zarroli Michael C.
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