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DESCRIPTION JPS5910097

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DESCRIPTION JPS5910097
[0001]
The present invention relates to an improvement of a composite speaker using a ceramic
piezoelectric element that performs band broadening by using diaphragms of two different
diameters. In this type of composite speaker, the back cavity of the small diameter diaphragm is
determined by the large diameter diaphragm and the ceramic piezoelectric element, and it is
difficult to improve the characteristics. In the present invention, a small-diameter large-diameter
diaphragm is obtained by contorolling the apparent back cavity from the through hole provided
in the neck portion of the large-diameter diaphragm with the bank cavity of the small-diameter
diaphragm of the small-diameter. It is intended to improve low and high frequency
characteristics. A description will be given below by the embodiment shown in the drawings. As
shown in FIGS. 1 and 2, the ceramic piezoelectric element 2 is held at the lower part of the
speaker frame 1, and the large diameter diaphragm 3 and the small diameter diaphragm 4 are
bonded to the ceramic piezoelectric element 2 There is. The edge portion of the large aperture
diaphragm 3 is supported by the frame 1, and the edge portion of the small aperture diaphragm
4 is supported by the small aperture diaphragm holding part 5 with an equalizer. A space
between the large diameter diaphragm 3 and the edge portion of the small diameter diaphragm 4
is filled with an airtight holding material 6 such as an edge paint. 3 is an oblique view of the
cross section of FIG. 1, and the small aperture diaphragm holding part 5 with an equalizer is not
shown. As shown in FIG. 3, a through hole 7 is provided in the neck portion of the large aperture
diaphragm 3. This through hole can control the apparent back cavity of the small-diameter
diaphragm and the large-diameter diaphragm. Control of the back cavity can be performed by
changing the number, area, arrangement, etc. of through holes. According to the present
invention, since it is possible to control the apparent back cavity by providing a through hole in
the rack portion of the large aperture diaphragm, it is advantageous to easily improve the
characteristics.
13-04-2019
1
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view of an embodiment of the present invention, FIG. 2 is a front view,
and FIG. 3 is a perspective view of the cross section shown in FIG.
1 ... speaker frame, 2 °° s ceramic piezoelectric element, 3 ...... large diameter diaphragm, 4 .......
small diameter diaphragm, small dated ..... EQ Diaphragm diaphragm holding parts, 6 · · · · · · · · · ·
air tight. 7 · · · · Through hole. Figure 1 Figure 2 Figure 3
13-04-2019
2
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