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JPS5224927

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DESCRIPTION JPS5224927
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of the mounting
portion of the present invention, FIG. 2 is an exploded view thereof, FIG. 3 is a front view of the
insulation push and FIG. It is a front view of a mounting bracket, an insulation ring, and a CRT
mounting bracket. In the figure, 2 is a CRT mounting bracket, 4 is a cabinet mounting bracket, 6
is a bolt, 8 is an insulating push 16 is an insulating ring. Fig. 3 Fig. 4 ■ 'at the time of Fig. 5 Fig.
6-
DETAILED DESCRIPTION OF THE INVENTION This invention is a% O for full drive
electrodynamic loudspeakers. A conventional full-drive electrodynamic speaker is shown in FIG.
1 in which the opposing magnets (1) +17 'and (phantom (! A magnetic circuit is formed by
alternately arranging magnets 11) having the same polarity 7 adjacent to each other so that they
have different polarities. And a magnetic flux (writing degree of magnetic flux B) as shown by a
broken line)] (in a direction perpendicular to the magnetic field to the nonmagnetic diaphragm
(3), and the diaphragm (3) in the same direction The electric current が flows to the coil (4) of
length ζ printed to vibrate, and the diaphragm (3) vibrates under the force of F = BIL to obtain
voice. In such a conventional speaker, due to the structure of the magnetic circuit, in order to
increase the magnetic flux density and increase the efficiency, K has to use a high-performance,
high-priced magnet of rare earth cobalt iron. When the amplitude of the diaphragm (1) further
increases, the coils (4) are respectively located in the sparse and tight portions of the magnetic
flux and the difference in magnetic flux density B is large even if the current is the same. It had
happened. The present invention has been made to solve the above-mentioned drawbacks, and
the details of the present invention will be described below according to the illustrated
embodiment. That is, in FIG. 2, 1 (IIIIF + (21 (z) 1) is an alnico-based or ferrite-based ordinary
permanent magnet and is disposed in the same manner as the conventional permanent magnets.
(3y is the gist of this invention, and consists of a magnetic material of high magnetic permeability
with permalloy force (as a moving plate, on which a conductor is insulated to make it
12-05-2019
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perpendicular to the magnetic flux) and a diaphragm ( A printed coil (4) is provided so that 37
vibrates in the same direction. In the speaker configured as described above, since the magnetic
material of permeability is used for the diaphragm, the attenuation of the magnetic flux is small,
and the magnetic flux can uniformly pass through the entire coil. Also in the case of a system or a
ferrite system, one having high efficiency can be easily obtained, and the distortion can be
further reduced.
12-05-2019
2
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