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JPS5587091

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS5587091
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a half sectional view of a general loudspeaker,
FIG. 2 is a half sectional view of a typical dome-shaped loudspeaker, and FIG. 3 is an embodiment
of a loudspeaker diaphragm according to the present invention. 4 is a sectional view of the same,
and FIG. 5 is an enlarged sectional view of the relevant part. 15 ииииии Metal diaphragm element, 1
B иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Thin layer of flexible material. ?
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a diaphragm for a
speaker using metal foil, which aims to provide a lightweight diaphragm having excellent
mechanical strength and a large internal loss. . In general, the speaker is configured as shown in
FIG. That is, a plate 2 having a center pole 1 and a ring-shaped magnet 3. 111, 7L / -A6 ? QL, j
in the magnetic circuit 5 similarly constituted by the ring-shaped upper plate 4. ?????? ?
?? ?????? The peripheral portion of the cone-shaped diaphragm 8 is joined together
with adhesive 7 together with the 7-3 ? ? 2 gasket 7, and the voice coil 9 is coupled to the
central portion of the diaphragm 8. To hold the lower part of the voice coil 9 in the magnetic cap
11 of the magnetic circuit 5 without eccentrically holding it with the damper 10, and the dust
cap 12 is attached to the upper surface of the central portion of the diaphragm 8 There is. Also,
as a dome-shaped speaker, as shown in FIG. Similarly, the peripheral portion of the dome-shaped
diaphragm 13 is coupled to the magnetic circuit S constituted by the ring-shaped upper plate 4
via the edge fixing ring 21, and the magnetic gap 11 of the magnetic circuit 5 is coupled to the
dome-shaped diaphragm 13. The voice coil 9 to be embedded is connected, and the upper
surface of the peripheral edge portion of the dome-shaped diaphragm 13 is pressed by a baffle
plate 14. In such a speaker, the dome-shaped diaphragm receiver 13 is often made of metal foil
such as aluminum-ram or titanium, and -11 cano 3 is used in many cases, and metal foil is used
as the cone-shaped diaphragm 8 these days. Are being developed and used. This diaphragm
made of gold cup nodes such as aluminum and titanium exhibits excellent rigidity, but the
internal loss is very high. ????????????? ??? In addition, in order to make the
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diaphragm lighter, the thickness of the metal foil must be made thinner, but if it is made thinner,
the mechanical strength of the diaphragm is reduced and the diaphragm is deformed at large
input or the surface resonance is abnormal. In the case of using an extremely thin metal foil as a
diaphragm, when using the metal foil as a diaphragm, it is preferable to use gold as the foil.
Countermeasures for resonance have been taken such as laminating and forming a foamed resin
layer. However, even in the above configuration, in order to improve the mechanical strength of
the metal diaphragm and to reduce the abnormal resonance of the diaphragm, the thickness of
the foamed resin layer must be considerably thickened or the mass must be increased. As a
result, it was impossible to take advantage of the effect of using an extremely thin metal foil.
The present invention eliminates the above-mentioned conventional drawbacks. Hereinafter, the
embodiment of the present invention and FIGS. 3 to 5 will be described. 15 is a thin portion of a
gold foil such as aluminum or titanium, and a fixing portion 16 to an edge fixing ring 21 and an
edge portion 17. In the metal mesh diaphragm element body in which the dome portion 1 day is
formed concentrically, innumerable projections 19 are formed on the dome portion 18 by
burring. A thin layer 2o of a flexible material such as resin or rubber is formed on the upper
surface of the dome portion 18 of the total bending diaphragm element 16. The thin layer 2 o of
the flexible material may be applied to both the upper and lower surfaces of the dome portion
18. Further, although the dome-shaped diaphragm has been described in the above embodiment,
it is possible to construct a cone-shaped diaphragm -1. That is, a flexible material is formed on
one or both of the cone surfaces of a metal diaphragm element in which the fixing portion to the
frame 6, the Eno 6-node portion, and the cone portion are formed concentrically and
innumerable projections are provided on this cone portion. If a thin layer of the above is formed,
a cone-shaped diaphragm can be obtained. That is, in the present invention, the metal diaphragm
element is mechanically formed by providing innumerable protrusions on the vibration surface of
the metal diaphragm element and forming a thin layer of the flexible material on one side or both
surfaces of the vibration surface. It is possible to create large ones with high electric power, so it
is difficult for split resonance to occur, and it is possible to extend the high frequency limit
frequency, withstand vibration at large input sufficiently, further increase the internal loss by the
thin layer of flexible material and make resonance As described above, the speaker diaphragm of
the present invention can provide various advantages, as it can be blocked, and peaks and dips
can be prevented from occurring in sound pressure frequency characteristics, and can be made
extremely flat and stable. It has great practical value.
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