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DESCRIPTION JPS5450970

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DESCRIPTION JPS5450970
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of an
embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1,
and FIG. 3 is its frequency response characteristic diagram FIG. FIG. 5 is a cross-sectional view of
the diaphragm of the embodiment of the pond, and FIG. 6 is a frequency response characteristic
diagram of the conventional small electronic buzzer. 1.2: Casing, 3: Diaphragm, 4: Piezoelectric
element, 5a, sb: Deformed part by concave groove, 6a, 6b: Deformed part by convex line, 7a,
7b.・ ・ Deformed part by fold.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a compact
electronic buzzer of the type in which a diaphragm is driven by a piezoelectric element or an
electromagnet device. Conventionally, this type of small electronic buzzer has been used for
watches, various alarms, etc. However, the thickness of the moving plate of the conventional
turtle is uniform, and its frequency response characteristics are as shown in Fig. 6 The # 1 single
unimodal surface ls shows all, there was a fault where the response band is narrow. The present
invention aims to eliminate the above-mentioned drawbacks of the prior art, and an embodiment
thereof will be described below. In FIGS. 1 and 2, -1 and 2 denote casings, 3 denotes a circular
diaphragm formed of phosphor bronze or the like, and 4Vi is a piezoelectric element fixed
downward of the diaphragm. The outer peripheral portion of the diaphragm 5 # 'i casing 1.2Kx-)
is held and fixed, and on the upper surface thereof, concave grooves 5G and 56 which are two
deformed portions of #' i concentric circle are formed. In the present embodiment, the recesses $
5a, 5- were formed to a depth (2) of 1/3 to 1/2 of the thickness of the diaphragm 5 by etching.
Due to the deformation by the recessed grooves 5a and 56, the vibration plate 3 has a node at
the outermost peripheral portion and a vibration of the resonant frequency f · and a resonant
frequency f! With the recessed groove 3a as a node. And the vibration of the resonant frequency
f2 with the concave groove 5b as a node are mutually related by the coupling. As a result, the
frequency response characteristic of the diaphragm 5 shows a multi-peak curve showing a peak
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at a frequency of approximately 11 fo + f ++ fx as shown by the solid line in FIG. 5, and the
response band is broadened. FIG. 4 is an example of forming concentric convex 6a, 66 tubes on
the circular diaphragm 5 by etching on the contrary to the above embodiment, and this is an
example of mourning. Circle-shaped folds 7. . 7- is an example formed by extrusion, or convex
ridges 6a, 6k. Alternatively, the same effect as that of the above embodiment can be obtained by
the deformation portion by the folds 7g and 7 &. In the present invention, the shape of the
diaphragm 3 is not particularly limited, and may be, for example, an ellipse or a rectangle. The
vibration mode is determined by the shape of the diaphragm and the fixing method thereof, but it
is desirable that the deformation portion be provided parallel to the node (3) of the vibration
mode of the diaphragm when this deformation portion is not provided. The drive type of the
diaphragm 3 is not limited to a single piezoelectric element. For example, according to the
present invention, the response band of the small electronic buzzer may be expanded according
to the present invention. It is possible to put out a very wide range of scales by using a small
electronic buzzer, widen its application range, and it is possible to further enhance the added
value of products such as clocks and the like by using this. Is really great.
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