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JP2001186587

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DESCRIPTION JP2001186587
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker used for various kinds of audio equipment, and more particularly to a speaker capable of
high fidelity reproduction of a bass range.
[0002]
2. Description of the Related Art As a conventional speaker, a dynamic type is used in which a
paper cone is used as a diaphragm and the diaphragm is directly translated by a force generated
by a magnetic field and a current [for example, Takeo Yamamoto "speaker system (Top) "(Showa
52) Radio Technology, Inc. p143-p147]].
[0003]
The conventional loudspeaker described above will be described below with reference to the
drawings with reference to FIG.
FIG. 3 is a side sectional view of a conventional speaker. In the figure, 1 is a diaphragm, 6 is a
frame, 2 is an edge with the inner peripheral end adhered to the outer peripheral end of the
diaphragm 1 and the outer peripheral end is fixed to the frame 6, and 3 is a center fixed to the
inner peripheral portion of the diaphragm 1. Cap 4 is a voice coil whose lower end is inserted
into the gap a of magnetic circuit A and its upper end is fixed to the inner periphery of
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diaphragm 1 5 is fixed to voice coil 4 at its inner peripheral end and frame 6 at its outer
peripheral end Damper. The magnetic circuit A includes a plate 7 fixed to the lower end of the
frame 6, a magnet 8 fixed under the plate 7, and a pole piece attached plate 9 fixed to the lower
end of the magnet 8.
[0004]
The operation of the conventional speaker configured as described above will be described
below. First, a magnetic field is formed in the magnetic gap a between the plate 7 and the plate 9
with a pole piece by the magnetic flux of the magnet 8, and when a voice current flows in the
voice coil 4 present in the magnetic gap a Force is generated and becomes a driving force. The
driving force vibrates the diaphragm 1 and the center cap 3 to generate a sound. At this time, the
damper 5 and the edge 2 hold the diaphragm 1 and the voice coil 4 in a fixed position and, for
the edge 2, the sound behind the diaphragm 1 is prevented from leaking to the front. Further, the
frame 6 fixes and positions the edge 2, the damper 5 and the plate 7.
[0005]
However, with the above-mentioned conventional speaker, the amplitude of the diaphragm 1 can
not be sufficiently large, so that the bass region can not be reproduced efficiently, and when the
large amplitude is obtained, the coil portion of the voice coil 4 Since a part of the magnetic coil
deviates from the magnetic gap a, it causes distortion due to non-linearity of the magnetic field,
and further, when the amplitude is large, the voice coil 4 has a side wall of the magnetic gap a
Had problems such as the occurrence of an abnormal sound.
[0006]
An object of the present invention is to solve such conventional problems, and to provide a
speaker that reproduces high-fidelity with high efficiency in the bass range.
[0007]
SUMMARY OF THE INVENTION In order to solve the above problems, the speaker of the present
invention forms a magnetic gap between a ring-shaped magnet and surfaces facing and facing
the upper and lower end faces of the ring-shaped magnet. From the first and second plates, a
rotatable conductive disc concentric with the ring magnet disposed in the magnetic gap, and an
external member provided near the central portion and the outer peripheral end of the
conductive disc An electrode for inputting an audio signal current, and a shaft having one end
rotatably mounted at a position deviated from the center of the conductive disc and the other
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end rotatably mounted to the diaphragm. is there.
[0008]
With this configuration, by applying an audio signal current to the center and the outer
peripheral edge of the conductive disk, the current flowing between the center and the outer
periphery, and the direction perpendicular to the conductive disk surface generated in the
magnetic gap of the magnetic circuit. A rotational force is applied to the conductive disc by the
magnetic field, and the rotational motion is converted into a linear motion by the shaft rotatably
attached to the conductive disc surface to vibrate the diaphragm to generate a sound. .
Therefore, the voice coil does not jump out of the magnetic gap even when the amplitude is large
as in the conventional speaker, so that the driving force according to the signal current is always
obtained, and high fidelity reproduction can be performed without distortion.
[0009]
According to a first aspect of the present invention, there is provided a ring-shaped magnet and a
first magnet mounted on upper and lower end faces of the ring-shaped magnet and forming a
magnetic gap between opposing surfaces. A second plate, a rotatable conductive disc concentric
with the ring magnet arranged in the magnetic gap, and a shaft for moving the diaphragm up and
down by the rotation of the conductive disc When a voice current is applied to the electrodes, the
conductor disc corresponding to the voice coil of the conventional speaker always rotates in the
same magnetic gap as it reciprocates, vibrating the diaphragm and generating sound, so that the
magnetic field is nonlinear. It does not cause distortion caused by it.
[0010]
Hereinafter, an embodiment of the speaker of the present invention will be described with
reference to FIGS. 1 and 2. FIG.
[0011]
FIG. 1 is a front view of a speaker according to an embodiment of the present invention, and FIG.
2 is a cross-sectional view of the main part taken along the line A-B.
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In the same figure, 10 is a rotatable conductive disc, 11 is its rotating shaft, and 12 is an
intermediate part of the conductive disc 10 in the radial direction other than the center thereof.
The shaft is attached to the lower end portion of the diaphragm 13 so as to be rotatable, and 14
is an edge in which the inner peripheral end is adhered to the outer peripheral end of the
diaphragm 13 and the outer peripheral end is fixed to a frame (not shown) Reference numeral 15
denotes a ring-shaped magnet, and 16 and 17 denote a first plate and a second plate which are
fixed to the upper and lower end faces of the ring-shaped magnet 15 and form a ring-shaped
magnetic gap 18 between opposing surfaces, 19a is an electrode provided at the periphery of the
conductor disc 10 for applying audio signal current, 19b is a center electrode provided at the
center of the conductor disc 10, and 20 is the conductor disc 10 when it is rotated. Conductor
disc 10 which makes the electrode 19a movable It is a slit provided in.
Further, a and a 1 indicate the direction of rotational reciprocation of the conductive disc 10, and
b and b 1 indicate the direction of movement of the diaphragm 13.
[0012]
The operation of the loudspeaker according to the present embodiment configured as described
above will be described below.
First, by applying an audio signal to the electrodes 19a and 19b, a current flows radially between
the center and the outer periphery of the conductive disk 10.
At this time, a magnetic field is present in the magnetic gap 18 in the direction perpendicular to
the surface of the conductive disc 10, and according to Fleming's left-hand rule, a force
corresponding to the applied audio signal is generated. A rotational force is applied to
reciprocate in the directions of arrows a and a1. Then, it is conducted to the diaphragm 13
through the shaft 12 attached to the conductive disc 10, and vibrates in the b and b1 directions
to generate a sound.
[0013]
As described above, according to the present embodiment, the reciprocating rotational motion of
the conductive disk 10 (the sound signal is an alternating current so that it actually behaves like
a pendulum) is converted to linear reciprocating motion by the shaft 12 to be vibrated. In order
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to drive the plate 13, the large input enters in the low frequency range, and the conductor disc
10 is always held in the magnetic gap 18 even when the amplitude is large, and the voice coil at
the large amplitude as in the conventional speaker. It is possible to achieve good bass
reproduction without distortion occurring due to the deviation from the magnetic gap.
[0014]
In the present embodiment, the same effect can be obtained even if a plurality of the conductive
disks 10 are configured in parallel due to the required acoustic characteristics although the
conductive disk 10 is driven by one.
[0015]
As described above, in the loudspeaker according to the present invention, an audio signal
current is made to flow radially between the center and the outer periphery of the conductive
disc, and it is reciprocated in a uniform magnetic field, and this reciprocation is performed by the
shaft. A speaker that generates sound by converting it to linear reciprocating motion and
transmitting it to the diaphragm. Since the voice coil does not come off from the magnetic gap as
in the past, distortion can be reduced and excellent acoustic characteristics are possessed. Can be
provided.
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