JPS5340233

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DESCRIPTION JPS5340233
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional domeshaped speaker diaphragm, FIG. 2 is a cross-sectional view of a speaker diaphragm according to
an embodiment of the present invention, and FIG. It is a sound pressure frequency-characteristics
figure of the invention diaphragm-type diaphragm for loudspeakers. 3 ······ Metal diaphragm, 3 ··· ·
· · · · · · · · · · · · · · · · · · · · · · · · · · dome portion, 39 · · · · · · · · · 4, 4 '· · · · · · · · · metal layer, 5, 5' · · .....
metal layer.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a diaphragm for a
dome type speaker in which a dome portion and an edge portion are integrally provided. First, a
conventional dome-shaped speaker diaphragm will be described with reference to FIG. In FIG. 1,
1 is a metal diaphragm in which a dome portion 1 ′ and an edge portion 1 ′ ′ are integrally
formed, and 2.2 ′ is Koten ′ ′ s − on the entire upper surface and lower surface of the metal
diaphragm 1 described above. The metal layer is 4 gz 2 g and this metal layer is boron. A low
density metal having a high modulus of elasticity such as benolium is formed by a method such
as vapor deposition. As described above, conventionally, the metal @ 2, 2 'is provided on the
entire upper and lower surfaces of the metal diaphragm 1 to raise the high frequency limit
frequency and the edge resonance frequency to outside the audible band. Since the metal layer
2.2 is provided on the entire upper and lower surfaces of the plate 1, the minimum resonance
frequency of the speaker is also increased, and the use band is increased. The present invention
eliminates the above-mentioned conventional drawbacks, and one embodiment of the present
invention will be described below with reference to FIG. In FIG. 2, 3 is a metal diaphragm in
which the dome portion J and the edge portion 3 "are integrally formed, and metal layers 4, 4
'are formed on the upper and lower surfaces of the dome diaphragm' of the metal diaphragm 3. It
is done. 6.5 'is a metal provided on the upper and lower surfaces of the central portion of the
edge portion 3', i.e., the portion 1 .. with the exception of the dome portion 3 'side of the edge
portion 3' and the outer peripheral side of the edge portion 3 '". In the layer, there are three. The
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metal diaphragm 3 is supported by making the outermost periphery of the edge portion 3 '"the
same room. In the conventional example, the metal layers 2 and 2 'are formed on the entire
upper and lower surfaces of the edge portion, so that the metal layers 2 and 2' suppress the
vibration of the metal vibration 1, and for this reason, the lowest resonance of the speaker
Although the frequency increased and the working band narrowed, according to the present
invention, since the metal layer 6.degree. 5 'is formed only at the central portion of the edge
portion, this metal 1 @ s, s' Thus, the vibration of the metal swing plate 3 is not suppressed, the
minimum resonance frequency of the speaker does not rise, and the use band is not narrowed. In
the present invention, since a low density metal layer having a high elastic modulus is provided,
the high frequency band upper limit frequency and the edge resonance frequency are naturally
increased to the outside of the audible band as in the conventional example shown in FIG. It is
possessed. FIG. 3 shows the sound pressure frequency characteristics of the present invention
and the prior art, and in FIG. And, when a metal layer is provided on the entire lower surface, C
shows the case of the present invention shown in FIG.
As apparent from FIG. 3, according to the diaphragm for dome-shaped speaker of the present
invention, the high frequency limit frequency (ju) and the edge resonance frequency (fAR) can be
obtained without raising the lowest resonance frequency (10). It can be raised outside the
audible band. In the embodiment shown in FIG. 2, metal layers are provided on the upper and
lower surfaces of the dome portion and the enone portion, but metal layers may be provided only
on the upper surface or only on the lower surface.
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