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JPS574899

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DESCRIPTION JPS574899
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing one
embodiment of the present invention, and FIG. 2 is a diagram showing sound pressure-frequency
characteristics. 1 · · · · · · · · · · · · · · · · · · · · · · · piezoelectric element.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezo sound
generator useful for use in an electronic watch with a melody notification function and a voice
notification function. Recently, in electronic watches and the like, it has often been found that an
alarm sound is made to sound a melody using a piezo sounding body, and one in which a piezo
sounding body is used to give voice notification of time and the like has been proposed. However,
according to the conventional structure of the simply miniaturized piezo speaker, the lowest
resonance frequency or high and thus the bass range is not good (the sound quality is not
excellent. (1) 9'1 By the way, the piezoelectric sounding body is thinner than conventional
products, for example, if the thickness of the diaphragm and the piezoelectric element (piezo
ceramic element) is 0.1 wn or less, the minimum resonance frequency falls and the sound quality
is improved It was confirmed experimentally to do. The present invention has such a thin
structure and further, by considering the material of the diaphragm, it is possible to suppress the
components of the high range and to improve the sound quality in a large range. An embodiment
of the present invention will be described below with reference to the drawings. FIG. 1 is a crosssectional view showing the structure of a piezoelectric speaker according to the present
embodiment, which is constituted by bonding a piezoelectric element (piezo ceramic element) 2
to a diaphragm 1 and has a diameter D-32 +++ m and a thickness t of the diaphragm 1. = 0.1 mm
+ diameter of piezoelectric element d = 22 + + + n, thickness t,-0, 1 + + m. The diaphragm 1 is
made of brass and contains 38% or more (the remainder is copper) as a zinc component in brass.
FIG. 2 shows the sound pressure (P) -frequency characteristics of a sounding body having the
diaphragm l and the piezoelectric element 2 of the dimensions described above, and the zinc
content of the diaphragm l being about 40% and about 30 (2) is shown by comparison, and the
04-05-2019
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solid line A indicates the zinc content of about 40%, and the broken line B indicates the same
content of about 35%. As is apparent from the figure, although the numbers are substantially the
same at the first resonance point 01 (the lowest resonance frequency fo), the solid line A (content
about 40%) is the sound pressure level at the second resonance point 02. Is lowered, that is, the
sound pressure level of the high frequency range component is suppressed to a low level, and the
sound pressure characteristics are further improved and the sound quality is excellent. Actually,
it was found that if the zinc content is 38% or more, the effect can be sufficiently raised and it
can be put to practical use. As described above, according to the present invention, the thickness
of the brass in the diaphragm is set to 38% or more, the minimum resonance frequency is in the
low frequency range, and the sound pressure level in the high frequency range is reduced. It is
possible to obtain a piezo sounding body excellent in sound quality, which is effectively
suppressed and suitable for meroti notification and audio notification.
04-05-2019
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