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JPS6116699

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DESCRIPTION JPS6116699
[0001]
The object of the present invention is to prevent the influence of the magnetic force emanating
from the magnet (permanent magnet) attached to the speaker. Industrial Application Field The
present invention relates to audio devices in general such as stereos, radio cassettes, and
televisions, and in particular, to those used in 哀 PEKA □ which affect convenience monitor
monitor tapes and disks. The prior art magnet is an integral part of the speaker, but since the
magnet always emits a magnetic force, noise is generated on the tape etc. when the magnetic
recording is made near the magnet and the 9 ′ ′ tape or disc is brought close to it. It is well
known that adverse effects such as the disappearance of the recordings are known. In the past,
as a measure to prevent the divergence of the magnetic force, it has been practiced to surround
the magnet with a magnetic shield (iron plate) or use the entire speaker as a magnetic shield
mechanism. However, the entire speaker including the cabinet is used as a magnetic shield
mechanism. Doing so leads to high cost, and surrounding the magnet 紘 because the magnetic
material is a magnetic body (iron plate), mounting takes time for the process, resulting in high
cost. . Problems to be Solved by the Invention The present invention is intended to prevent the
magnetic force emitted from the magnet of the speaker to an extent that the tape and the disk
are not affected, and to reduce the cost by eliminating the process as much as possible. 1 is an
exploded perspective view of the present invention, FIG. 2 is an exploded side view of the present
invention, FIG. 3 is a view showing a magnetic shield disk and a magnetic shield attached state,
and FIG. The longitudinal sectional view, FIG. 5 and FIG. 6 of the present invention are other
embodiments of the present invention. Reference numeral 1 denotes a bottomed cylindrical
cover, which is provided on the inner surface of the side wall 1a of the cover 1 in the form of a
recess 2 'and vertically elongated, and the locking post 3 is planted in the bottom 1b close to the
recess. Reference numeral 4 denotes a magnetic shielding disk mounted on the bottom 1 b of the
cover 1, and increases or decreases the number of mounted disks according to the strength of
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the magnetic force of the magnet of the speaker. Reference numeral 5 denotes a magnetic
shielding band wound like a spiral spring, one end of which is fitted between the recess 2 and the
locking post 3 and mounted on the inner surface of the side wall 1 a of the cover 1. Reference
numeral 6 denotes a speaker, and T denotes a magnet. The cover 1 on which the magnetic shield
4 and the magnetic shield 5 are mounted is configured to be attached to the speaker so as to
surround the magnet 7 as shown in FIG. Means for solving the problem In the magnet T attached
to the rear of the skier 6, the side of the magnet T is surrounded by a spiral wound magnetic
shield 5, and the rear opening of the magnet not surrounded by the magnetic stripe 5 In order to
surround the magnetic disk 4 with magnetic shielding disks, a magnetic shielding band and a
magnetic shielding disk are attached in advance in the cover 1, and the problem is solved by
fitting the cover 1 to the magnet 1. The number of the magnetic shield disks 4 may be
appropriately increased or decreased according to the strength of the diverging magnetic force.
After attaching the required number of the magnetic shield disks 4 to the bottom 1b of the action
cover 1, as shown in FIG. 3, one end of the magnetic shield 5 wound in a spiral shape is the
recess 2 and the locking post 3 It mounts ¦ wears with the inner side of the side wall 1a of the
cover 1 so that it may be inserted between. After the magnetic shield 4 and the magnetic shield
band 5 are attached as described above, as shown in FIG. 4, the cover is attached to the speaker
so as to surround the magnet 7. Embodiment As shown in FIG. 5, the provision of the notch 2a in
the central portion of the recess 2 facilitates the attachment and detachment of the magnetic
shielding band 5, and as shown in FIG. 6, the side wall 1a of the cover 1 has a double structure.
Can further increase the magnetic shielding effect. The effect of the present invention is as
follows: The magnetic shield 6 mounted in the effect cover 1 of the invention is wound like a
spiral spring, and therefore, in addition to the magnetic shield effect for each magnetic shield, a
synergy due to the presence of a gap between the wound magnetic shields. The magnetic shield
effect is further improved by the effect. Moreover, by making the side wall of the cover 1 double
structure, the magnetic shielding effect is also added by the presence of the air gap of the cover,
and even if the tape, disk, etc. are brought close to the speaker, the magnetic shielding effect of a
strong degree is received. Can be achieved. Oka, one end of the magnetic shielding band 5 is
attached between the recess 2 provided on the inner surface of the side wall 1 a and the support
30 provided near the recess 2, and it is curved between the recess 2 and the support 30 ,
Magnetic field is held firmly. Next, test results will be described below. Test method (comparison
test by naked speaker and boxed speaker 211) Magnetic field (235m x L x t 0.36 @) Magnetic
field disk (a 55g Xto, 3g) Appendix is for magnetic field disk, magnetic field bare speaker Based
on the measurement of the magnetic force, the magnetic field of the ferrite magnet is made one
to five times on the outer circumference of the ferrite magnet, and one to five magnetic shielding
disks are stacked at the rear to measure the magnetic force. The front part a1 of the speaker The
outer part b1 of the speaker is measured at each position of the rear part C of the speaker. The
demagnetizing force of the test 1 to 5 of the bare speaker is 60%, and the test 6 to 90 of the
speaker in the box is 70%. And 1. In the case of one magnetic shield disk and wire protection
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band, the magnetic shield is hardly seen, but when it is gradually increased to two or three, the
magnetic coercive force is increased, and it is further increased and this effect is less found. The
measurement method is to measure the amount of divergence of the magnetic force by the
number of pieces of iron pieces of a predetermined weight absorbed at each position (a, b, c) of
the speaker, and each number in a and b Sc in the table is adsorbed. Represents the number of
iron pieces.
The table shows the test results for the speaker composed of a metal frame, and when the frame
of the speaker is composed of a frame other than metal (such as plastic), eg, the table test 5 It
falls sharply like the numerical value in 0 shown in the column of. . Also, the magnetic force at
the front of the speaker is reduced in divergence due to the demagnetization of the magnet. This
phenomenon is a magnetic shield (magnetic shield disk. Because the magnetic shield band has
the property of concentrating and closing the magnetic force on the magnet, it is shown that a
thin magnetic shield plate is highly effective. Further, as shown in FIG. 6, by making the side wall
1a of the cover 1 in a double structure, it is also confirmed that the magnetic shielding effect is
increased to the east.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is an exploded perspective view of the present invention, FIG. 2 is an exploded side view of
the present invention, FIG. 3 is a view showing the installation of a magnetic shield disk and a
magnetic shield band, and FIG. 4 is a longitudinal sectional view of the present invention 5 and 6
are other embodiments of the present invention.
1: Cover 2-concave portion 3: Locking post 4: Magnetic shield disk 5: Magnetic shield zone Fig. 3
Fig. 5 Fig. 4 Fig. 6
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