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JPH099391

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH099391
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
loudspeaker using a repulsion magnetic circuit, and more particularly to providing a repulsion
magnetic circuit type loudspeaker with improved efficiency by effectively utilizing a repulsion
magnetic field.
[0002]
2. Description of the Related Art Conventionally, as shown as an example in FIG. 4, it is made of a
magnetic material disposed between two magnets 12 and 12 arranged such that the same poles
face each other and both magnets 12 and 12. There is a so-called repulsive magnetic circuit type
speaker using a repulsive magnetic circuit 11 configured of the center plate 13.
[0003]
In the speaker using the conventional repulsive magnetic circuit, the magnets 12 and 12 and the
center plate 13 have a donut shape, and the pole portion of the holder 15 is inserted into the
center hole thereof, and the magnetic circuit component is The voice coil 14 is disposed within
the repulsive magnetic field generated on the outer periphery of the center plate 13 by coupling
and fixing.
In the figure, 16 is a frame, 17 is a damper, 18 is a diaphragm, and 19 is an outer ring made of a
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magnetic material.
[0004]
SUMMARY OF THE INVENTION The conventional repulsion magnetic circuit type speaker only
utilizes the magnetic flux on the outer peripheral side of the magnets 12 and 12 and does not
utilize the magnetic flux generated on the inner peripheral side. .
[0005]
An object of the present invention is to provide a highly effective repulsive magnetic circuit type
speaker by utilizing not only the magnetic flux generated on the outer peripheral side of the
magnet but also the magnetic flux generated on the inner peripheral side.
[0006]
[Means for Solving the Problems] In order to achieve the above object, the repulsive magnetic
circuit type loudspeaker of the present invention comprises a magnetic material disposed
between two magnets arranged such that the same poles face each other and both magnets. A
repulsive magnetic circuit type speaker using a repulsive magnetic circuit composed of a center
plate comprising the magnet and the center plate in a donut shape, and the inside and outside of
each repulsive magnetic field generated on the inner periphery and outer periphery of the center
plate The voice coil of (1) is arranged for synchronous driving.
[0007]
In this case, double cylindrical inner and outer voice coils can be joined to a flat diaphragm, or
the diaphragm can be a cone diaphragm and the inner and outer voice coils can be supported by
respective dampers. Also, the inner and outer voice coils can be made independent, for example,
the outer voice coil can be joined to the woofer's diaphragm and the inner voice coil can be
joined to the tweeter's diaphragm.
[0008]
The inner and outer voice coils are synchronously driven by reversing the winding directions of
the inner and outer voice coils and arranging them on the inner and outer peripheral sides of the
center plate, respectively.
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Not only the outer circumferential side of the magnet but also the magnetic flux on the inner
circumferential side can be used to increase the efficiency.
[0009]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a repulsive
magnetic circuit type speaker according to the present invention will be described based on FIGS.
1 to 3. The same components as those of the conventional repulsive magnetic circuit type
speaker described based on FIG. The same reference numerals will be assigned to and the
description thereof will be omitted.
In the figure, reference numeral 1 denotes a repulsive magnetic circuit, which is composed of two
magnets 2 and 2 arranged so that the same poles face each other and a center plate 3 made of a
magnetic material arranged between both magnets 2 and 2 The magnets 2 and 2 and the center
plate 3 are formed in a donut shape so that repulsive magnetic fields are generated on the inner
peripheral side and the outer peripheral side of the center plate 3.
[0010]
The repulsive magnetic circuit 1 is placed on a holder 15 made of a nonmagnetic material, and
the pole portion 15 a of the holder 15 is loosely inserted into the center hole of the repulsive
magnetic circuit 1. An air gap is formed between the inner circumferential surface and the pole
portion 15a.
[0011]
An outer voice coil 4a and an inner voice coil 4b are disposed on the outer and inner
circumferential sides of the repulsion magnetic circuit 1, respectively. The two voice coils 4a and
4b are different in winding direction and synchronized with each other. It is supposed to be
driven.
In the embodiment of FIG. 1, the double cylindrical voice coils 4a and 4b are joined to the flat
diaphragm 8.
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In addition, 8 a is an edge of the diaphragm 8.
[0012]
In the embodiment of FIG. 2, a cone diaphragm is used as the diaphragm 8, and the outer voice
coil 4a and the inner voice coil 4b are independently supported by upper and lower two dampers
7a and 7b.
That is, a plurality of through holes are formed at equal intervals in the circumferential direction
in the vicinity of the center of the coil bobbin of the outer voice coil 4a, while the inner
peripheral side of the lower damper 7b supporting the inner voice coil 4b has a spoke shape. It is
extended and penetrates the said through-hole, and supports the coil bobbin of inner voice coil
4b.
[0013]
In the embodiment of FIG. 3, the voice coil 4a, 4b inside and outside are made independent, and
the outside voice coil 4a is joined to a flat diaphragm 8 provided with a sub cone disposition hole
in the center for the woofer, and the inside voice coil 4b is It is joined to subcorn 9 for tweeter
use. The outer peripheral end of the damper 7 supporting the inner voice coil 4 b is fixed on the
magnet 2 of the repulsive magnetic circuit 1.
[0014]
According to the repulsive magnetic circuit type speaker according to the present invention,
repulsive magnetic fields generated on the outer peripheral side and the inner peripheral side of
the repulsive magnetic circuit can be used, and two voice coils are arranged in the vibration
system. Can increase the driving force and increase the efficiency of the speaker. Also, multi-way
can be achieved with one magnetic circuit.
[0015]
Brief description of the drawings
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[0016]
1 is a cross-sectional view showing an embodiment of the repulsive magnetic circuit type speaker
of the present invention.
[0017]
2 is a half cross sectional view showing another embodiment of the repulsive magnetic circuit
type speaker of the present invention.
[0018]
3 is a half cross sectional view showing still another embodiment of the repulsive magnetic
circuit type speaker of the present invention.
[0019]
4 is a half sectional view of a conventional repulsive magnetic circuit type speaker.
[0020]
Explanation of sign
[0021]
Reference Signs List 1 repulsive magnetic circuit 2 magnet 3 center plate 4 voice coil 4 a outer
voice coil 4 b inner voice coil 5 holder 7 damper 8 diaphragm 9 sub cone
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