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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a general domeshaped speaker, FIGS. 2A and 2B are top and half cross-sectional views of a conventional domeshaped diaphragm, and FIGS. FIG. 4 is a top view and a half sectional view showing an
embodiment of a dome-shaped diaphragm used for the dome-shaped speaker of the invention,
and FIG. 4 is a sound pressure frequency characteristic diagram of the present invention and a
conventional dome-shaped speaker. 5 ...... magnetic circuit, 6 ...... edge fixing ring, 7 ...... domed
diaphragm, 8 ...... voice coil 9 ...... Magnetic gap, 11 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и thin layer.
DETAILED DESCRIPTION OF THE INVENTION The present invention is an improvement of a
metal dome diaphragm to provide a dome speaker having flat sound pressure frequency
characteristics. In general, a dome-shaped speaker is constructed as shown in FIG. 1, that is, a
plate having a center ball 1) a rim 77 ? ? и ? ? ? ? 22 a ring-shaped magnet 3 and a ringshaped upper plate The peripheral portion of the dome-shaped diaphragm 7 is fixed on the
magnetic circuit 6 constituted by the edge fixing ring 6 by the edge fixing ring 6, and the voice
coil 8 is coupled to the rising portion of the dome portion of the dome-shaped diaphragm 7 The
lower portion of the magnetic circuit 5 is inserted into the magnetic gap 9 of the magnetic circuit
5, and a baffle plate 1o is attached to the upper portion of the magnetic circuit 5. In the domeshaped speaker having such a configuration, the conventional dome-shaped diaphragm 7 is made
of metal, cloth, resin, valve or a composite thereof as shown in FIGS. 2A and 2B. In order to
expand the reproduction frequency band of the sound pressure frequency characteristic of this
dome shaped speaker to a high frequency and to perform good Hi-Fi regeneration, E / ? (E is
Young's modulus and ? is density of the material of dome shaped diaphragm 7 Generally,
diaphragms made of metal materials such as aluminum and titanium have high frequency range
compared to diaphragms made of resin and other materials centering on cloth, and the raw
material is enlarged. As shown by the broken line in FIG. 4, a significant peak occurs near the
high frequency limit frequency, which causes the Hi-Fi regeneration to be inhibited. It is intended
to provide a dome-shaped speaker capable of performing good 7 Hi-Fi reproduction by removing
the peak generated near the high frequency limit frequency which is a defect while taking
advantage of the advantage that the high region reproduction frequency possessed by the
diaphragm is high. Ah Ru. The configuration of the dome-shaped speaker is basically the same as
that of FIG. 1, and the dome-shaped diaphragm 7 characterized by the present invention will be
described with reference to FIGS. 3A and 3 H. That is, the dome-shaped diaphragm 7 is
aluminum. It is made of metal plate such as titanium and is formed by the flat edge portion 11
and the dome portion 12, and a plurality of radial thin portions extending from the peripheral
portion to the top portion of the dome portion 12 on the surface or the back surface of the dome
portion 12 The dome-shaped diaphragm 7 is formed by coating a thin layer 14 of a material
having a large mechanical loss such as rubber on the entire dome portion 12 by coating. In the
present invention, the thin-walled portion 13 is formed at a predetermined position in advance
by etching a 7-shaped metal plate before forming. After molding it, a thin layer 14 is formed and
Usually, a peak occurs near the high frequency limit of a dome-shaped speaker using a domeshaped diaphragm made of a metal plate because the response is driven from the periphery of
the dome, <1) the force is narrow at the top of the dome It is said that ijT, which is a collection of
parts, is a part of ijT. Therefore, in the dome-shaped diaphragm 7 of the present invention in
which the metal portion is reduced quantitatively toward the top and the amount of the material
of the thin layer 14 such as relatively large loss rubber is increased, stress is applied to the top.
The occurrence of peaks is suppressed by the thin layer 14 having a large mechanical loss even if
it is concentrated. Furthermore, the upper limit frequency of the dome-shaped speaker is
determined by the hardness of the rising portion to which the voice coil 8 of the dome-shaped
diaphragm 7 is attached, but the thickness of the rising portion in the above configuration is the
same as the original thickness. There is no loss of high frequency limit 6 frequency because there
is. Also, even if a thin layer 14 giving mechanical loss, such as rubber, is formed, the weight of
the diaphragm itself is reduced by the thin portion 13 by etching and the like, and the diaphragm
as a whole is equivalent to V. There is no reduction in sound pressure. Therefore, the sound
pressure frequency characteristic can be made flat as shown by the solid line in FIG. 4, and f (i-Fi
can be reproduced again). As described above, the tom-shaped speaker of the present invention
has various advantages and is of great practical value.
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