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JPS4951218

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DESCRIPTION JPS4951218
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a conventional
sound generator, FIGS. 2 to 4 are views showing the main parts of the embodiment of the sound
generator of this invention, and FIG. FIG. 6 is a longitudinal sectional view showing another
embodiment of the present invention. FIG. 6 is a characteristic curve diagram used to explain the
operation of the apparatus shown in FIG. 1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · tongues, 6, 61, 62 · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · resonant cylinder, 1 · · · resonant cylinder . Fig. 1 34 "12 Fig. 3 Fig. 4
Fig. 4-39 = real opening 49-51 18 2 (2) Fig. 5 Fig. 6-40
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an acoustic
generator using a surface piezoelectric element such as barium titanate. In the conventional
sound generator, as shown in the first WK, the metal 41 with the piezoelectric element (1)
attached thereto (the part corresponding to the node of the vibration on Zl is a protrusion (4) of
the housing by the adhesive (8) It was stuck to the However, in such a conventional device, it is
difficult to accurately fix the portion corresponding to the vibration node, and it is not possible to
improve the manufacturing efficiency if it is fixed by the adhesive. This device was considered in
(1) in order to solve such a problem, and as shown in FIG. 3, three tongues are provided on the
peripheral portion of a metal disk (3) to be a diaphragm. A piece (5) is installed, and the tip of
this tongue piece <S> is configured to be fixed to the casing by a screw or the like. When the
metal disc (1) is supported by the 18 tongues (5) K in this way, it becomes K as shown by the
node point # (6) of the vibration, and when supported by the 4 tongues The vibration node is as
shown by the dotted line (61) in FIG. 3, and when it is supported by six tongues, #i, and the
vibration node is shown by the point M (62) in FIG. become. Then, the relationship between the
number (N) of the tongues (5) and the frequency of ringing is as shown in FIG. 5. Therefore, if the
number (N) of the tongues (5) is appropriately selected, An acoustic generator of desired
frequency can be obtained. Also, as shown in FIG. 6, 1 piezoelectric element (1) is attached, and
04-05-2019
1
the metal disk (2) supported by the tongue piece (5) has a resonance pattern (? Conversion
efficiency can be significantly improved if (8)
04-05-2019
2
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