JPS57162699

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DESCRIPTION JPS57162699
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an upper case of a
piezoelectric buzzer according to the present invention, and FIG. 2 is a lower case of the same
buzzer according to a preferred embodiment of the present invention. FIG. 3 is a longitudinal
cross-sectional view showing a state in which upper and lower cases are fixed. In the drawings, 1
is an upper case, 4 is a locking portion, 5 is a corrugated uneven portion, 7 is a lower case, 9 is a
receiving portion, 12 is a sound hole, and 13 is a volume expansion cone.
The present invention relates to a piezoelectric buzzer which vibrates an electrostrictive element
by application of a pulsating current, and derives such vibration as an expanding sound by a
cone, and in particular, facilitates assembly and disassembly of each member. About the buzzer.
Various types of piezoelectric buzzers have been proposed as a piezoelectric buzzer in which
electrical energy is converted into mechanical energy by an electrostrictive element to emit
sound. However, they all have low voltage ((but also large 1- 廓慴 ·)) 1. -It is possible to generate
wrinkles, or to adjust the pitch of the sound, etc., and the ease of its assembly and disassembly is
not considered at all. Therefore, replacement of parts is difficult, and the present condition is that
it is rather disposable. Furthermore, in the conventional buzzer, the main purpose is only to
increase the volume, and no consideration is given to the sound quality, and there is a drawback
that the sound is heard in the case. The present invention is effective in view of the above
problems! 'The present invention was made to solve the problem. That is, the object of the
present invention is to provide a piezoelectric buzzer which is extremely easy to assemble and
disassemble and that no sound is heard in the case. In the side face of the upper case which holds
the cone for 挾 Fl-, I, an engaging part having a corrugated uneven part is provided. A plurality of
sound release holes are formed on the bottom of the lower case in the history, and γ here is
taken as the gist. 2-. Wholesale 227. Hereinafter, a preferred embodiment of the present
invention will be described in detail according to the attached drawings. FIG. 1 is a perspective
view of the upper case of the piezoelectric buzzer according to the present invention, FIG. 2 is a
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plan view of the lower case, and FIG. 3 is a longitudinal cross-sectional view of the upper and
lower cases holding the cone. The upper case 1 has a substantially ring shape, and the flange
portion 2 is integrally provided inward from the upper end edge, and the inner peripheral edge
of the flange portion 2 forms the groove portion 3 for guiding the sound. There is. On the side
surface of the upper case 1 is attached a pair of γ-shaped locking portions 4 which are fixed by
turning the upper case with respect to the lower case. The locking portion 4 has a knurled
corrugated uneven portion 5 formed on the upper surface, and a stopper 6 is provided upright at
the end of the inclined upper surface to prevent the upper case 1 from rotating more than
necessary. . The pair of locking portions 4 have the same inclination direction of the upper
surface with respect to the turning direction of the upper case 1. In the illustrated example, the
upper surface of the locking portion 4 is inclined L so as to be 3-11) ', 023+ (d !, "; j, but the
effect is the same even if the lower surface is inclined. .
The lower case T is substantially dish-shaped, and a pair of receiving portions 9 is provided on
the outer side of the outer peripheral wall 8. The receiving portion 9 is formed by bending an
end portion of the extending portion 9a extending outward from the middle portion of the outer
peripheral wall 8 upward to form a rising portion 9b, and bending an upper end of the rising
portion 9b inward. The extending portion 9a, the standing portion 9b, the horizontal portion 9c,
and the outer peripheral wall 8 form a space portion S in which the upper booth 1 provided with
the locking portion 4 is fitted. An inner wall 11 having a diameter smaller than that of the outer
peripheral wall is erected on the bottom surface 10 of the lower case 7, and the electrostrictive
element 12 is disposed in the inside of the lower case 7.・ Forms. The sound expanding cone 14
held between the upper case 1 and the lower case 7 has a central portion in the shape of an
inverted cone 15 and a channel portion 16 is formed around the inverted conical portion. In the
above, the cone 14-4-0240 is placed on the upper end portion of the lower case 7 via the
channel portion 16, the upper case 1 is covered from above, and the upper case is rotated, for
example, clockwise. Then, the tip of the locking portion 4 provided in the upper case 1 enters the
space S of the receiving portion 9, and when the upper case 1 is turned further, the locking
portion of the tenth case 1 is the receiving portion 9 of the lower case. The upper case 1 and the
lower case 7 are integrally pressed together and the cone 13 is held therebetween. The above is
only one embodiment of the present invention. For example, the locking portion may be tapered,
and the shape and number of the sound removal holes formed on the bottom of the lower booth
are optional. As apparent from the above description, according to the present invention, in the
piezoelectric buzzer in which the cone for volume expansion is held between the upper case and
the lower case, the inclined surface in which the corrugated uneven portion is formed on the side
surface of the upper case In this case, the above-mentioned engaging part is fitted to the lower
case, and the engaging part 1 is provided. In this way, the one-touch operation of the upper case
is simply performed without using a special member such as a screw. Since the buzzer can be
assembled in operation, and the case can be removed in the same manner, 5-'1025 · · · · 1 &, ... □
/ / and similar operation, it is extremely easy to assemble and disassemble, It is effective when
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used for home or learning materials. In addition, since a plurality of sound release holes are
formed in the bottom of the lower case, the sound can be prevented from being heard in the case,
and the acoustic effect can be improved. Furthermore, since the above can be achieved by using
a simple member to reduce the number of parts, cost reduction can be achieved, and a great
advantage is exhibited.
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