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DESCRIPTION JPS61161900

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DESCRIPTION JPS61161900
[0001]
FIELD OF THE INVENTION The present invention relates to an electrodynamic loudspeaker with
reduced magnetic leakage. 2. Related Art In recent years, as the performance of television has
advanced, not only the improvement of image quality but also the sound quality has come to be
required. In order to improve the performance of the sound, external speakers are often used in
addition to the speakers built in the television. In general, external speakers use magnets larger
than those incorporated in television sets to achieve high performance. Hereinafter, an example
of the above-described electrodynamic speaker will be described with reference to the drawings.
FIG. 5 shows a cross section of a conventional electrodynamic speaker, in which 1 is a ringshaped magnet, and 2 is a yoke having a center pole 3 provided at the center in contact with one
end surface which becomes the magnetic pole of the magnet 1. Reference numeral 4 denotes a
plate serving as the other magnetic pole of the magnet, and an iron frame 6 is provided in
contact with the plate 4. A voice coil 6 is supported by a damper 8 to be held in a magnetic gap 7
formed annularly by the center pole 3 and the plate 4. The voice coil 6 is coupled to the coupling
cone 9 together with the damper 8. A flat diaphragm 10 has an edge 11 integrally fixed to the
periphery thereof, and receives vibration generated in the voice coil 6 by the coupling cone 9. 12
adheres to the iron frame 6 with the edge 17 with arrow paper. It is fixed. The operation of the
electrodynamic speaker configured as described above will be described below. FIG. 6 shows the
same speaker as that in FIG. 6 except for the vibration system part, and the names and functions
of each part are the same as in FIG. The left half of this figure is a model of the flow of magnetic
lines, and the operation of the conventional example will be described based on this figure.
Assuming that the polarity of the magnetized magnet 1 is such that the plate 4 side is the N pole
yoke side is the S pole, magnetic lines of force coming out of the N pole pass through various
magnetic paths and enter the S pole. The main magnetic flux (i) that generates force in the voice
coil 6 is supplied to the magnetic gap 7, and all other magnetic flux lines except the main
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magnetic flux (i) become unnecessary leakage magnetic flux. Leakage flux (/ ? part, it is
relatively easy to apply a magnetic shielding structure in the cabinet that houses the speaker, and
in some cases, the cabinet can take a distance to the television, so that special measures may not
be necessary. . Problems to be Solved by the Invention However, in the above-mentioned
configuration, in particular, the leakage magnetic flux (b) portion is the front surface of the
diaphragm, and providing the magnetic shield structure material degrades the acoustic
performance.
As described above, it is very difficult to simultaneously satisfy both of applying a magnetic
shield without losing the acoustic performance. SUMMARY OF THE INVENTION In view of the
above problems, the present invention provides an electrodynamic speaker that can significantly
reduce the leakage of magnetic flux in the front direction of a diaphragm. In order to solve the
above problems, in order to solve the above problems, the electrodynamic speaker of the present
invention has a damper attachment of an iron frame provided with damper clamps made of a
magnetic material all around or part of the part, A magnetic body is provided at a position in
contact with the center pole and the other end corresponding to the damper clamp. Operation In
the present invention, according to the configuration described above, the damper attachment of
the iron frame distributes the magnetic material having high permeability around the entire
circumference or part of the part, and one end contacts the center pole and the other end
attaches the damper attachment. The magnetic flux leakage toward the front of the diaphragm is
focused by providing another corresponding high permeability magnetic material so as to face
the magnetic material provided in the section, and the magnetic path flowing from the iron frame
to the center pole The leakage flux to the front surface of the speaker diaphragm can be reduced
by forming. Embodiment An electrodynamic speaker according to an embodiment of the present
invention will be described with reference to the drawings. FIG. 1 shows a cross-sectional view of
an electrodynamic speaker according to a first embodiment of the present invention. In FIG. 1,
reference numeral 1 denotes a ring-shaped magnet, and 2 denotes a yoke provided with a center
pole 3 at the center which is provided in contact with one end surface of the magnet 1 to be a
magnetic pole. Reference numeral 4 denotes a plate serving as the other magnetic pole of the
magnet, and an iron frame 6 is provided in contact with the plate 4. A voice coil 6 is supported
by a damper 8 which is held in a magnetic gap 7 formed annularly by the center pole 3 and the
plate 4. The voice coil e is coupled to the coupling cone 9 together with the damper 8. A flat
diaphragm 1Q has an edge 11 integrally fixed to the periphery, and receives a vibration
generated in the voice coil 6 by the coupling cone 9. 12 are adhered and fixed to the iron frame
6 together with the edge 11 with arrow paper. 13 is a damper clamp which is one of the main
components of the present invention, made of a high magnetic permeability material such as an
iron plate, silicon steel plate, permalloy or the like, all around the circumference of the damper
attachment portion 6a or A part of the damper 8 is pressed against, and the outer periphery is
designed to be in contact with the frame.
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Also, 14 is one of the main components similar to 13 above, and is a center pole fitting in which
one end is in contact with the center pole 3 and the other end is in contact with a position
corresponding to the damper presser 13. The center pole 3 and 14 are also made of a high
magnetic permeability material such as an iron plate, a silicon steel plate, or permalloy. FIG. 2
shows the configuration of the speaker excluding the vibration system in the embodiment of FIG.
1, and the left half is a model in which the flow of magnetic lines of force is entered. The
operation of the electrodynamic speaker configured as described above will be described below
with reference to FIGS. 1 and 2. In FIG. 2, the main magnetic flux (i) portion from the plate 4 in
contact with the magnet 1 and the other leakage magnetic fluxes can be divided to consider the
flow of magnetic force lines. Most of the magnetic flux leaking from the iron frame 5 to the
diaphragm 1Q side is the magnetic flux flowing to the center pole 3 through the damper clamp
13 and the center pole fitting 14, and the magnetic flux (le) leaking to the front of the speaker is
greatly reduced. This is because in the configuration of the present invention as compared with
the conventional example, a passage in which the magnetic resistance is reduced is formed by
the damper press fitting 13 and the center pole fitting 14. As described above, according to the
present embodiment, by providing the damper clamp 13 in contact with the iron frame 5 and
providing the center pole fitting 14 on the center pole 3, the magnetic leakage to the front of the
electrodynamic speaker is achieved. It can be greatly reduced. Hereinafter, a second embodiment
of the present invention will be described with reference to the drawings. FIG. 3 shows an
example of the electrodynamic speaker with less magnetic leakage in the second embodiment of
the present invention. In FIG. 3, the components 1 to 14 have the same names and configurations
as the first embodiment of the present invention shown in FIG. What differs from FIG. 1 is that a
sub-magnet 16 is provided on the back of the yoke 2 to further reduce leakage magnetism. In the
configuration as described above, the sub magnet 16 is magnetized in reverse polarity to the
magnet 1 and has a function of canceling out the leakage flux from the frame 5 to the rear
surface side. As described above, by providing the sub magnet 16 on the back of the yoke 2, it is
possible to reduce the magnetic leakage to the back of the electrodynamic speaker in addition to
the front of the diaphragm in the first embodiment. A third embodiment of the present invention
will be described below with reference to the drawings. FIG. 4 shows an example of an
electrodynamic speaker showing a third embodiment of the present invention, in which the
magnetic leakage is further reduced as compared with the second embodiment.
In FIG. 4, the components 1 to 16 are the same as those of the second embodiment of the present
invention except for the play 4a. In this figure, the plate 4a is the first. Unlike the second
embodiment, the outer diameter end face of the magnet 4 is larger than the magnet 1, and a barlike magnetic shielding cover 16 in contact with the sub magnet 16 is provided on the outer
diameter end face of the play 4a so as to cover the entire field portion. ing. This magnetic
shielding cover 16 can greatly reduce the leakage flux on the rear side of the speaker, and in
addition to the effects of the second embodiment, it is possible to further reduce the magnetic
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leakage on both the front and rear sides of the speaker. In the above embodiment, the damper
clamp 13 is used to prevent magnetic leakage in the front direction of the diaphragm, but for this
purpose, the damper attachment of the frame 6 has the same function except for the part. It is
obvious that a structure providing a magnetic material may be applied. Effect of the Invention As
described above, according to the present invention, a ring-shaped ring is formed by a ring
magnet, a center pole passing through the center of the magnet, a yoke in contact with one
magnetic pole of the magnet, and a plate in contact with the other magnetic pole. And an iron
frame fixed to the plate, and a damper clamp made of a magnetic material is provided on a part
of the frame, and one end is in contact with the center pole and the other end is the damper By
providing a center pole fitting made of a magnetic material at a position corresponding to the
fitting, it is possible to reduce the magnetic leakage toward the front of the diaphragm, and to
secure the fixing of the damper and the machine of the frame. It also contributes to the
improvement of the target strength and is effective in preventing abnormal vibration of the
frame. Furthermore, it is possible to reduce the magnetic leakage not only to the front surface of
the diaphragm but also to the rear surface direction by providing the second magneft reversely
magnetized on the rear side of the yoke. Further, by providing a crucible-shaped magnetic
shielding cover connected to the plate in contact with the other end face of the reverse
magnetization magnet at the rear of the yoke, the magnetic shielding structure is further
enhanced to reduce magnetic leakage.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view of an electrodynamic speaker according to a first embodiment of
the present invention, FIG. 2 is a configuration diagram for explaining a state of magnetic leakage
except for vibration system parts, and FIG. FIG. 4 is a cross-sectional view of an electrodynamic
speaker according to a third embodiment of the present invention, and FIG. 6 is a cross-sectional
view of a conventional electrodynamic speaker according to the second embodiment. The figure
is a block diagram for explaining the state of magnetic leakage except for the vibration system
parts.
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...... voice coil 7 ......... magnetic gap, 8 ...... damper, 13 ...... damper bracing , 14 ...... center pole
bracket, 15 ...... Sabumaguneso), 16 ------ magnetically shielded cover. Name of agent Attorney
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