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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a conventional speaker, FIG.
2 is a half sectional view of the main part of the same speaker, and FIG. 3 is a half sectional view
of the main part of the speaker in one embodiment of the present invention. FIG. 1 · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Phase equalizer, 5 · · · · ·
· · · · · ----- yoke, 7 ...... l · Tsubu plate, 8 ...... diaphragm, 9 ...... edge portion, 10 ... ... fixing ring, 11
...... coil bobbin 12 ...... voice coil, 13 ...... magnetic fluid 14 ...... throat, 15 ...... groove.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loudspeaker in
which magnetic gaps are filled with magnetic fluid to prevent temperature rise of voice coil and
to increase the resistance to input force. 9 '/. Sq.y-.sigma..sup.-2 providing a speaker that does
not fly into the interstices of the 1 and 2 show a conventional D speaker. In FIG. 1 and FIG. 2, 1 is
a plate having a hole at its center, 2 is a cylindrical magnet fixed on the plate 1, 3 is a cylindrical
magnet fixed to the end face of the Macnet 2. The center pole 3 has a phase equalizing device 4
fixed to the end face of the center pole 3. In this phase equalizer 4, a slit 5 of 'D' number is
formed, and the end 1m is formed in an arc shape. 6 is a cylindrical 1-shaped yoke, which is
identified on the plate 1. The circle 6 and the plate 1 may be integrated. An annular top plate 7 is
fixed on the yoke 6, and an annular magnetic cap is formed between the inner surface of the top
plate 7 and the outer periphery of the center pole 3. Reference numeral 8 denotes a diaphragm,
and an enon portion 9 of the diaphragm 8 is fixed to the fixed rein 10 and fixed to the top plate
7. A coil 11 is wound on a diaphragm 8 and a coil of a voice coil 12 is wound 9'13. The voice coil
12 is disposed in the magnetic gap portion. 13 is a magnetic fluid filled in the magnetic gap. The
magnetic fluid 13 is superparamagnetic fine particles (for example, fine particles having a
particle diameter of several hundred angstroms or less such as magnetite t ferrite) in water or an
organic solvent (for example, a hydrocarbon solution). The solution is suspended in a hydrogen
fluoride solution, an L-stel solution, a silicone solution, to form a colloidal solution, and has a high
thermal conductivity. In addition, before suspending the fine particles in water or an organic
solvent, it is preferable to chew the surface of the fine particles with a long chain molecule such
as totenehensen or oleic acid. In the above conventional speaker, when a signal is supplied to the
voice coil 12, the diaphragm 8 vibrates and a sound wave is generated, and the sound wave
generates the slit 5 of the phase control unit 4 and the central hole and throat 14 of the center
pole 3. Radiation to the outside. The heat generated in the voice coil 12 / through the magnetic
fluid 13) is dissipated to the Tono Fluorate 7 center cylinder 3 and the temperature rise of the
voice coil 12 is reduced-as a result of 9'14, the speaker's high resistance Power linearity can be
improved as well as input can be realized.
However, in the above-described conventional speaker, the magnetic fluid 13 is scattered by the
vibration ω1 of the whiss coil 12, and the period in which the heat radiation effect is exhibited is
shortened, and the scattered magnetic one fluid 13 is placed in the diaphragm 8 and so on. There
was a defect that entered into the gap with the controller 4 and significantly reduced the low
range health of the sound sweat solid wave number characteristic. 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. 3, reference numeral 15 denotes
a massive concave groove formed in the external use portion of the phase equalizer 4. As in the
above embodiment, when the annular recess 15 is formed in the phase equalizer 4, even if the
magnetic fluid 13 is vibrated by the vibration of the diaphragm 8, the negative fluid 13 is
contained in the recess 15. In addition, it does not scatter in the space between the diaphragm 8
and the phase equalizer 4 and does not degrade the low-range region's health with the effect of
the cast-off effect of the magnetic fluid 13 over a long period of time. :-'91 N 5
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