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JPS61230497

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DESCRIPTION JPS61230497
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
loudspeaker that seals between a diaphragm and a frame with a magnetic fluid using a magnetic
fluid holding magnetic circuit. [Background of the invention] With the outer surface of a
cylindrical member integrally fixed to the peripheral edge of the diaphragm and the inner surface
of the magnetic fluid holding magnetic circuit facing each other, the gap between them is sealed
with a magnetic fluid to make the magnetic fluid For example, while the speaker entitled
“Multiple driving system full seven-range Svica 1” in the February issue of Radio Technology
19B is referred to as a speaker that supports the vibration system, Let's explain it briefly. FIG. 2 is
a cross-sectional view showing a conventional example of a dome flood speaker in which the
periphery of a dome-shaped diaphragm is cylindrically enclosed, and FIG. 3 is an enlarged view
of a magnetic fluid filled portion in FIG. As shown in FIGS. 2 and 3, a dome-shaped diaphragm
(hereinafter referred to as a diaphragm). 1) and the tubular member 2 at the periphery of the
diaphragm are connected via an adhesive 5 ′ ′ 4I: The tubular member 2 is a pair of bobbins
and the outside of the tubular member 2 The side surface 13 and a magnetic circuit for holding a
magnetic fluid (hereinafter, may be abbreviated as a magnetic circuit). 8) The inner surface 14 of
8 is opposed to the whole surface, and the entire circumference is positioned with a y uniform
gap α, and this magnetic circuit 8 is bonded to the frame 7 via the adhesive 15CL'lf :. Then, the
magnetic fluid 9 is filled in the gap α. The magnetic fluid holding magnetic circuit 8 is composed
of an annular magnet 19 and soft magnetic material plates 20 and 20 'coupled to each other via
an adhesive 15b so as to hold it, and is axially magnetized. Therefore, the magnetic fluid 9 is
adsorbed and held, and the whole of Na is sealed. In addition, 4 is a voice coil, 5 is a spider, 6 is a
spidering, 10 is a center ball, 11 is a yoke plate, and 12 is a magnet. By the way, in such a
speaker, when assembling the magnetic fluid holding magnetic circuit 8 or when installing the
magnetic circuit 8 in the 7 frames 7, the magnetic fluid holding magnetic circuit 80 annular
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magnet 19 and the soft magnetic material In the case where the annular magnet 19 is configured
as a divided product between the parts to be adhered with the plate 20.20 ′, the part to be
adhered to the joint point and the parts to be adhered between the magnetic circuit 8 and the
frame 7 When a gap or a slight air hole is left in each of them, the magnetic fluid 9 filled in the
gap α is transmitted through the gap or the air hole by the action of capillary action, and the
magnetic circuit 8 for holding the magnetic fluid May flow out of the outer surface 17 or the
corner 18 of the
Therefore, in order to prevent the magnetic fluid from flowing out and decreasing in this manner,
conventionally, when assembling the magnetic circuit for holding the magnetic fluid, between the
parts constituting the magnetic circuit, and also When installing the magnetic circuit in the
frame, it is necessary to pay close attention not to create a gap or a slight air hole between the
magnetic circuit and the frame, so that it takes a long time to assemble, It was too expensive.
OBJECTS OF THE INVENTION It is an object of the present invention to avoid the drawbacks of
the prior art described above, and to provide a magnetic fluid filled between the diaphragm and
the frame without requiring a long time for assembly and cost increase. To provide a speaker
with a more reliable sealing effect by the magnetic fluid which is intended to be prevented.
[Summary of the Invention] A magnetic fluid flows out and decreases along gaps and air holes
which are respectively generated between components constituting a magnetic fluid holding
magnetic circuit and between the magnetic circuit and a frame. In the present invention, the
outer surface 111 of the magnetic fluid holding magnetic circuit and a corner portion formed by
the outer surface and a surface of the frame to which the magnetic circuit is fixed are covered
with an adhesive or the like in the present invention. It is made to seal. DETAILED DESCRIPTION
OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described
with reference to FIG. The M1 view is a cross-sectional view showing the magnetic fluid filling
portion in an embodiment of the present invention. The configuration of this embodiment is
substantially the same as that of the speaker shown in FIG. 2, but the following points are
different in the magnetic fluid filled portion as shown in FIG. That is, in this embodiment, as
shown in FIG. 1, the outer surface 17 of the magnetic fluid holding magnetic circuit 8, the surface
of the frame 7 on which the magnetic circuit 8 is installed, and the outer surface 17 of the
magnetic circuit 8. A thin and thick build-up and sealing is carried out over the entire surface by
the adhesive 16 or the like. With such a configuration, when assembling the magnetic fluid
holding magnetic circuit 8 or when installing the magnetic circuit 8 on the frame, the annular
magnet 19 and the soft magnetic material plates 20 and 20 'are subjected to In the case where
the annular magnet 19 is configured as a divided product between bonding parts, there are gaps
and slight air holes between the bonding points serving as joints 6 of the joint and the bonding
parts of the magnetic circuit 8 and the frame 7 respectively. Even if it remains that it remains, the
outer surface 17 of the magnetic fluid holding magnetic circuit 8 and the vicinity thereof are
sealed over the entire surface, so that the magnetic fluid 9 filled in the gap 9 acts as a capillary
effect It can be prevented from flowing out through the gap or air hole and the outer surface 17
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or the corner portion 18 of the magnetic fluid holding magnetic circuit 8.
In addition, when it is possible to seal completely when building up and sealing with the adhesive
16 etc., it may be thin, but if it is thickly sealed, the sealing is incomplete and there may be gaps,
pores, etc. However, since the strong portion of the magnetic field of the outer surface 17 of the
magnetic fluid holding magnetic circuit 8 is filled with the adhesive 16 or the like, there is no
concern that the magnetic fluid 9 may be attracted thereto. Although the dome-shaped speaker
has been described above in the present embodiment, the present invention is of course not
limited to this. [Effects of the Invention] According to the present invention, the sealing effect of
the magnetic fluid is further ensured by the above-mentioned configuration, so abnormal noise
due to rolling of the diaphragm or disturbance of the frequency characteristic etc. Prevent the
occurrence. It is possible to obtain a high quality speaker with excellent reliability. Also, when
assembling the magnetic fluid holding magnetic circuit and bonding the magnetic circuit to the
frame with an adhesive, it is necessary to pay close attention so as not to leave any slight gaps.
Although it takes a long time to assemble, according to the present invention, there is an effect
that the assembly becomes easy and the cost can be reduced economically.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view showing a magnetic fluid-filled portion in one embodiment of the
present invention, FIG. 2 is a cross-sectional view showing a conventional speaker, and FIG. 3 is
an enlarged view of the magnetic fluid-filled portion in FIG. .
DESCRIPTION OF SYMBOLS 1 ... Domed diaphragm, 2 ... Tubular member 3 ... Adhesive agent 4 ...
Voice coil, 5 ... Spider, 6 ... Spidering, 7 ... Frame, 8 ... Magnetic fluid holding magnet 9 ... magnetic
fluid, air circuit, 10 ... center ball, 11 ... yoke plate, 12 ... magnet, 13 ... outer surface of cylindrical
member, 14 ... Inside surface of magnetic fluid holding magnetic circuit, 15α, 15b, 16 ...
Adhesive, 17 ... Outer surface of magnetic fluid holding magnetic circuit 8, 18 ... Surface of frame
7 and magnetic fluid Corners formed by the outer surface 17 of the holding magnetic circuit 8,
19 ... annular magnet, 20.20 '... soft magnetic material plate.
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