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JP2003143688

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2003143688
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker used for various audio devices, and more particularly to an electrodynamic speaker for
high frequency range reproduction.
[0002]
2. Description of the Related Art With the recent advent of an audible out-of-band source
including a signal of 20 kHz or more accompanying the digitization of audio equipment, it is also
required that a speaker can sufficiently reproduce a high frequency of 20 kHz or more.
[0003]
The prior art will be described with reference to the leaf speakers of FIGS. 5 and 6.
FIG. 5 is an exploded perspective view of a conventional leaf speaker, and FIG. 6 is a top view of a
diaphragm which is the main part of the leaf speaker.
[0004]
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In the figure, 9 is a leaf diaphragm, and 10 is a frame provided with a rectangular hole 10a for
mounting the coil 9a of the leaf diaphragm 9 in the exposed state. The leaf diaphragm 9 is
formed by forming a coil portion 9a consisting of a pattern coil on an insulating film and
connecting a lead 13 to an end 9b of the coil portion 9a.
[0005]
A magnetic circuit 11 is formed of a yoke 11b which is usually formed by bending a metal plate,
and a rectangular magnet 11a mounted on the top of the bottom of the center, and the magnet
11a and the yoke 11b on both sides thereof. A magnetic gap 11d is formed by the upper side
surface 11c of the magnetic head.
[0006]
The frame 10 is attached to the magnetic circuit 11 so that the coil portion 9a of the attached
leaf diaphragm 9 is aligned with the position of the magnetic gap 11d.
[0007]
With the above configuration, the coil portion 9a exposed to the strong magnetic field generated
in the magnetic gap 11d of the magnetic circuit 11 vibrates according to the electric signal input
from the lead wire 13, and the leaf diaphragm 9 emits a sound.
[0008]
SUMMARY OF THE INVENTION In the above-described conventional loudspeaker, the direction
of the magnetic flux of the magnetic gap 11d is reversed between the two magnetic gaps 11d, so
the coil portion 9a is reversed.
Although one of the inverted portions is used as a connection wiring portion with the lead wire
13, it is a portion not exposed to the magnetic field including the opposite side, which is a factor
to reduce the use efficiency as a coil.
Therefore, when a large driving force is obtained, it is difficult to reduce the size and weight
because the magnetic circuit is increased in size.
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[0009]
The present invention solves the above-mentioned problems, and aims at effectively using the
pattern coil and providing a small, lightweight, highly efficient speaker by effectively using the
leakage flux of the magnetic gap of the magnet.
[0010]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to a
first aspect of the present invention, there is provided a yoke having an inner bottom surface on
which a plate frame is provided at the periphery and a center pole is formed. And a magnetic
circuit comprising a magnet mounted around the center pole, and a plate mounted on the
magnet, and a diaphragm provided with a pattern coil on an insulating film provided on the
magnetic circuit. A speaker, wherein an outer magnetic gap is formed between the outer
periphery of the magnet and the plate frame of the yoke, an inner magnetic gap is formed
between the inner periphery of the magnet and the center pole, and the outer magnetic gap is
formed And the winding direction of the pattern coil on the inner magnetic gap is reversed, and
the pattern coil on the outer magnetic gap and the pattern on the inner magnetic gap are
reversed. By reversing the winding direction of the run coil, the direction of the magnetic gaps on
the inner and outer peripheries is reversed, sound pressure is secured without sound cancellation
being canceled, and the pattern coil can also be used effectively. is there.
[0011]
According to the second aspect of the present invention, the winding directions of the respective
pattern coils on the inner circumferential magnetic gap and the outer circumferential magnetic
gap according to the first aspect of the present invention are reversed and the pattern coils are
continuous 1 It is formed by two pattern coils, and effective use of the pattern coils can be
performed at each one place of the inner and outer peripheries with the lead wires, and can be
made the same as the conventional wiring operation man-hour.
[0012]
According to the third aspect of the present invention, the diaphragm according to the first or
second aspect is provided with radial wrinkles, and the rigidity of the diaphragm can be
improved and the distortion can be reduced. .
[0013]
According to a fourth aspect of the present invention, the radial wrinkles according to the third
aspect are provided at substantially equal angles, and the vibration attitude of the diaphragm is
stabilized by the equalization of the rigidity, and the speaker characteristic is obtained. A stable
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thing is obtained.
[0014]
According to a fifth aspect of the present invention, the lead wire for connection to the end on
the inner peripheral side of the pattern coil according to the first or second aspect is a through
hole of a center pole from the bottom of the magnetic circuit portion. The wiring of the lead wire
is carried out using the through hole of the center pole on the inner peripheral side, so that the
diaphragm space can be effectively used.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a loudspeaker according
to the present invention will be described below with reference to FIGS.
[0016]
(First Embodiment) FIG. 1 is an exploded perspective view of a speaker according to an
embodiment of the present invention, and FIG. 2 is a cross-sectional view showing the
relationship between a magnetic circuit which is the main part and a diaphragm. Is a top view of
the diaphragm which is the main part.
[0017]
According to the figure, reference numeral 1 denotes a diaphragm on which a frame 7 is
mounted.
2 is a plate and 3 is a hollow magnet.
A yoke 4 has a center pole 4a projecting from an inner bottom surface and a ring-shaped plate
frame 4b projecting in the same direction as the center pole 4a at the periphery.
[0018]
A magnetic circuit A is formed by the diaphragm 1, the plate 2, the hollow magnet 3 and the
yoke 4.
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[0019]
Further, an inner magnetic gap 4c is formed between the hollow magnet 3 fixed on the inner
bottom surface of the yoke 4 and the plate 2 on the upper side and the center pole 4a, and the
hollow magnet 3 and the plate 2 on the upper side and the plate frame 4b And an outer magnetic
air gap 4d is formed between them.
[0020]
The diaphragm 1 has a pattern coil 6 formed on the surface of the insulating film 5, and is
composed of an inner pattern coil 6a corresponding to the inner magnetic gap 4c and an outer
pattern coil 6b corresponding to the outer magnetic gap 4d. The coil 6 is provided continuously
and in the opposite winding direction.
The outer and inner pattern coils 6a and 6b are mounted on the outer and inner magnetic gaps
4c and 4d formed by the yoke 4 and the hollow magnet 3 and the plate 2, respectively, and
signals are input to both ends of the pattern coil 6. As a result, the insulating film 5 vibrates to
reproduce sound.
[0021]
Since both magnetic gaps 4c and 4d are formed by one hollow magnet 3, the direction of the
magnetic field is reversed by the inner magnetic gap 4c and the outer magnetic gap 4d, and the
pattern coil 6 is wound in the same direction. If so, the pattern coil 6 reverses the winding
direction of the pattern coil 6 on the inner magnetic gap 4c and the outer magnetic gap 4d so
that the sound can not be canceled and the sound pressure can not be secured. 6a and an outer
pattern coil 6b are provided.
[0022]
In addition, since the inner pattern coil 6a and the outer pattern coil 6b are formed as one
pattern coil 6, connection with the lead wire 13 can be performed in one place on each of the
inner and outer circumferences, and space reduction of connection points and simplification of
work can be performed. It is.
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Further, the pattern coil 6 on the insulating film 5 is appropriately selected from known means
such as conductive printing, etching, vapor deposition, sputtering, sticking of a coiled copper foil,
and the like.
[0023]
Further, since the center pole 4a has a through hole, the end of the inner pattern coil 6a and the
lead wire 13 can be connected through the through hole, so wiring on the diaphragm 1 can be
achieved. Instead, effective use of the space of the diaphragm 1 can be achieved.
[0024]
Second Embodiment Another embodiment of the speaker according to the present invention will
be described with reference to a top view showing the outer shape of the diaphragm of FIG.
[0025]
According to the drawing, reference numeral 8 denotes a diaphragm, and the difference from the
diaphragm 1 of the first embodiment is that radial wrinkles 8a are provided (the configuration of
the pattern coil is omitted from the drawing).
The wrinkles 8a are radially provided to improve the rigidity of the diaphragm 8 and to suppress
distortion, and by providing the wrinkles 8a radially at substantially equal angles, the rigidity of
the entire diaphragm is equalized and the vibration state is stabilized. Characteristics can be
improved.
[0026]
Although each part of the speaker has been described as being circular in the above
embodiments, the same effect can be obtained with a rectangular shape.
[0027]
As described above, the speaker of the present invention makes it possible to provide a smallsized, light-weight, high-efficiency speaker in which the sound pressure is improved.
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