JPS5647600

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DESCRIPTION JPS5647600
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing an embodiment
of a piezoelectric buzzer according to the present invention, and FIG. 2 is a perspective view
thereof. DESCRIPTION OF SYMBOLS 1: .. Piezoelectric buzzer element, 2 ... metal case, 3 ...
printed circuit board (or insulating board), 4 ... contact point, 5,6 ... connection end '+ (■ or ○
Input terminal, grounding terminal).
DETAILED DESCRIPTION OF THE INVENTION The present invention provides a piezoelectric
buzzer which is extremely easy to assemble and which is excellent in characteristics.
Conventional piezoelectric buzzers, particularly those with a case, are connected with lead wires
and solder when connecting the oscillation circuit to the piezoelectric buzzer element through
the connection terminal. According to this, when it is vibrated, wire breakage of lead wire, · · · · · · ·
· · "1 °" · · · "1" · · 7-"1 1417 ° 7 l 2. -The metal substrate which comprises an element was
extended directly, and served as the terminal. However, according to this, when the terminal is
attached to the printed circuit board, the variation in the attachment state is large, and the
oscillation state is adversely affected and the oscillation is often unstable. The present invention
has been made to eliminate the above-mentioned conventional drawbacks, and one embodiment
of the present invention will be described with reference to the drawings. In the figure, 1 is a
piezoelectric buzzer element formed by bonding a piezoelectric element 1a and a metal substrate
1b, 2 is a plurality of through holes 2a formed on the upper wall, a step 2b and a plurality of
openings The piezoelectric buzzer element 1 is firmly housed and fixed to the step 2 b in the case
2 by welding or the like. 3 is a printed circuit board (or insulating plate) provided so as to cover
the opening tj 4 of the case 2; 7> 2 back wells fitted so as to be in contact with the cut and raised
dowels 2C; It is fixed by caulking. , 1-Normon 3-The input terminal 6 for O or O and the terminal
6 for grounding are firmly fixed to the printed circuit board 3 by the n-tome 7.7 '. The contact 4
fixed by 7 is in contact with the piezoelectric element 1 a of the piezoelectric buzzer element 1.
The grounding terminal 6 and the case 2 are electrically connected via the copper foil portion on
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the printed circuit board 3 and are electrically connected by mutual contact when using an
insulating plate instead of the printed circuit board 3 . Then, the terminal 6.6 is connected and
fixed to a printed circuit board [stock] (not shown) which constitutes an oscillation circuit.
Although two connection terminals have been described in the above embodiment, in the case of
a piezoelectric buzzer element having a feedback electrode, connection terminals for? Or? Are
further provided on the printed circuit board 3 and connected thereto. A new fixed contact may
be brought into contact with the feedback electrode.
r> As described above, the piezoelectric buzzer of the present invention is configured to be 2-one,
and it is not necessary to use a lead wire or the like when connecting the oscillation circuit to the
piezoelectric buzzer element 4 and one point, Problems such as lead wire breakage and solder
detachment / f), f '[et n' 70 6 f $ fi,!: & 64 study . In addition, since a blank plate or an
insulating plate is interposed between the metal case and the connection terminal, external
vibration is transmitted to the piezoelectric buzzer element and the oscillation is stabilized. It has
excellent features.
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