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JPS56108692

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DESCRIPTION JPS56108692
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a general oblique view showing an electroacoustic transducer according to the present invention, FIG. 2 is an enlarged cross-sectional view
of FIG. 1-- and FIG. 3 is a plan view of another embodiment Fig. 4 is a cross-sectional view taken
along the lines of Figs. 1 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 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 и и и и и 10 и и и и и и и и и и и и и и и и и и
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Magnetic fluid. ?
The present invention relates to an electro-acoustic transducer, and more particularly to an
electro-acoustic transducer in which a ribo-type diaphragm suspension / improvement is
modified. Micro-ho, which is an electro-acoustic transducer, or ribo /! The one using the II
diaphragm To is a very light mass of this 9 & 11 type moving plate, and since the diaphragm
itself is a conductor, it is uniform without generating divided vibration up to high frequency.
While it has the advantage of vibrating, it has the disadvantage of requiring a powerful magnetic
circuit because the area of the diaphragm is reduced and the efficiency is reduced depending on
the size / structure of the diaphragm. ---, o, (, q 2 Therefore, the present invention is intended to
be able to support without sacrificing the area of the ribbon diaphragm, and therefore, it is
necessary to make the magnetic field along the longitudinal direction of the ribbon diaphragm It
is characterized in that an edge is formed by a fluid to support the ribo-type diaphragm.
Hereinafter, an embodiment of the present invention will be described with reference to the
attached drawings. First, reference numeral 1 is shown in FIG. 1 and a magnet co is fixed to both
ends of the yoke I, respectively. In the magnetic gap formed between the plates 3 and 3 which is
disposed with the magnetic gap 3 properly disposed, the ribbon diaphragm 10 made of a
conductor is disposed. In the longitudinal direction both shoulders iIc of the ribbon type
diaphragm 10, the lead-out pieces / are drawn out via the edge 11, and are connected to the
input signal source / 3VC respectively. Furthermore, in the width direction both edges of the VC,
ribo / type diaphragm 10, in other words, along the edge along the plate 3, it is bent into an L-
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shape to increase the surface area to form a furanone 10s, This flange 10. And an edge due to
the magnetic fluid Ih having a viscosity in the gap between the plate 3 and the plate 3. The
magnetic fluid / 4i supports the rib 3 and the diaphragm io with a magnetic attachment force to
the plate 3 and a viscous plate, and has a saturation magnetic flux density of 100 to 200 G.
Specific gravity: 1.05 to 2.05, viscosity: 5 to 2500 cps. Those having properties such as surface
tension crab 18-28 dyne / cm, heat conductivity 220-140 О 10'cab / ░ C-? are used. This
magnetic flux is obtained by mixing magnetic powder such as manogaff ferrite and nickel ferrite
into a grease-like or rubber-like medium to obtain the above-mentioned characteristics. In the
above embodiments, the edges of the ribbon diaphragm supported along the longitudinal
direction are supported by the magnetic fluid, but depending on the weight, size, and shape of
the diaphragm, all the edges may be made of magnetic fluid. It can be supported.
In the embodiment L5 shown in FIGS. 3 and 4, in one example, the inner peripheral edge iob of
the doughnut-shaped ribo-type diaphragm is used as a pole yoke, and the outer peripheral edge
lOc is supported by the plate 3 and supported. It is Although the example of the speaker unit was
shown as an electroacoustic transducer above, micro phone / can also be comprised similarly. As
is apparent from the above description, according to the electro-acoustic transducer of the
present invention, since the ribbon diaphragm is supported by the magnetic fluid with respect to
the magnetic circuit component member, the edge resonance is suppressed and the diaphragm is
The non-linearity is suppressed because the mass of the lens is small, the edge is not pinched
when the amplitude is large, and the heat of the diaphragm is easily dissipated L7.
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