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JPH0711095

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DESCRIPTION JPH0711095
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
coaxial type composite speaker.
[0002]
2. Description of the Related Art Conventionally, as shown in FIG. 2, for example, as shown in FIG.
2, in this type of composite speaker, a spacer 22 is provided on the center pole 21 of the external
magnetic type magnetic circuit 20 on the woofer side. There is a device in which an external
magnetic type magnetic circuit 23 on the tweeter side is provided to drive the woofer and
tweeter. In the figure, 25 is a diaphragm for woofer, 26 is a diaphragm for tweeter, and as shown
in FIG. 3, an inner magnet type comprising a bowl type yoke 24a on the center pole 21 of the
external magnetic type magnetic circuit 20. The magnetic circuit 24 was provided to drive the
woofer and tweeter.
[0003]
As described above, in the conventional composite type loudspeaker, two separate magnetic
circuits 20, 23 or 24 are disposed one above the other in one loudspeaker, and so on. Although
the woofer and tweeter diaphragms 25 and 26 are driven, their positions are different, which
causes problems such as interference of sound, large number of parts as a whole, and that the
thickness of the speaker can not be reduced. there were.
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1
[0004]
The present invention has been proposed in view of the above, and the object of the present
invention is to provide a coaxial composite speaker in which the interference of the sound is
prevented, the number of parts is reduced, and the thickness is reduced. It is to do.
[0005]
In the present invention, the front magnet 3 and the rear magnet 2 are respectively provided on
the upper and lower sides of the flange portion 1a of the yoke 1 so that the same poles face each
other, and the voice for the woofer is provided on the outer periphery thereof. The voice coil 10
connected to the tweeter-side diaphragm 13 is provided in the magnetic gap 5 provided with the
coil 6 and formed between the center pole 1 b of the yoke 1 and the plate 4 provided on the
front magnet 3. The tweeter-side diaphragm 13 and the woofer-side diaphragm 9 are provided
on substantially the same plane, and the above object is achieved.
[0006]
In the present invention, since the magnetic circuits on the woofer side and the tweeter side are
shared, the positions of the large aperture woofer diaphragm 9 and the small aperture tweeter
diaphragm 13 can be made substantially the same, It prevents interference of sound and makes it
possible to obtain high quality sound.
In addition, the magnetic circuit adopts a repulsive magnetic field method, and by sharing the
woofer side and tweeter side, it is possible to reduce the number of parts and make it thin.
[0007]
DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows an embodiment of the present
invention.
In the drawing, reference numeral 1 denotes a reverse T-shaped yoke, and a ring-shaped rear
surface magnet 2 is provided below the flange portion 1a.
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2
Further, on the upper side, front magnets 3 of substantially the same shape are provided, and the
facing surfaces of the front and rear magnets 3, 2 across the flange portion 1a of the magnets 3,
2 are respectively magnetized to the same pole such as N pole, The opposite side is magnetized
to the S pole, and a so-called repulsive magnetic field system is adopted.
[0008]
A ring-shaped plate 4 is provided on the top of the front magnet 3, and a magnetic gap 5 is
formed between the inner peripheral surface of the plate 4 and the upper outer peripheral
surface of the center pole 1b of the yoke 1. A single magnetic circuit is configured.
[0009]
A voice coil bobbin 7 having a voice coil 6 with a gap on the outer periphery of the magnetic
circuit, that is, the outer periphery of the flange portion 1a of the yoke 1 and the outer periphery
of the rear surface magnet 2 and the front surface magnet 3 It is provided so as to be able to
vibrate.
Further, a diaphragm 9 for a large diameter woofer is coupled to an upper portion of the voice
coil bobbin 7. The outer peripheral portions of the damper 8 and the diaphragm 9 are supported
by a frame (not shown).
[0010]
Further, in the magnetic gap 5, a voice coil 10 on the tweeter side is provided. 11 is a voice coil
bobbin, 12 is a damper for supporting the voice coil bobbin 11, and 13 is a small aperture
diaphragm for tweeter.
[0011]
In operation, on the woofer side, the flow A of magnetic flux from the front magnet 3 passes
through the flange portion 1a → voice coil 6 → air, the blade 4 → the front magnet and the flow
B of magnetic flux from the rear surface magnet 2 The flange portion 1 a → voice coil 6 →
passes through the air and returns to the rear surface magnet 2. When an audio current flows to
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3
the voice coil 6 in this process, a driving force is generated according to Fleming's right-hand
rule, the woofer diaphragm 9 vibrates, and a sound wave is emitted.
[0012]
The voice coil 10 in the magnetic gap 5 is driven in a known manner via the magnetic flux C
returning to the front magnet 3 → flange portion 1 a → center pole 1 b → plate 4 → front
magnet 3 as a tweeter. Sound waves are emitted from the diaphragm 13 for
[0013]
In this case, the woofer diaphragm 9 and the tweeter diaphragm 13 are provided on substantially
the same plane, in other words, they are arranged on substantially the same plane, and emit
sound waves, respectively.
That is, both magnetic circuits are shared, and the upper portion of the voice coil bobbin 7 on the
woofer side is positioned near the plate 4, the inner peripheral portion of the woofer diaphragm
9 is coupled to the neck thereof, and this diaphragm 9 The aperture is large, and the top of the
tweeter diaphragm 13 provided at the center is located at a position substantially at the center of
the aperture. This can be easily realized because the magnetic circuit is shared by adjusting the
size of the voice coil bobbin 11 on the tweeter side, the position of the damper 12 supporting the
same, and the like.
[0014]
As described above, according to the present invention, the front magnet 3 and the rear magnet
2 are respectively provided on the upper and lower sides of the flange portion 1a of the yoke 1
so that the same poles face each other, Voice coil 6 connected to the diaphragm 13 on the
tweeter side in the magnetic gap 5 formed between the center pole 1b of the yoke 1 and the
plate 4 provided on the front magnet 3 The tweeter-side diaphragm 13 and the woofer-side
diaphragm 9 are provided on substantially the same plane, and the two sound sources on the
woofer side and the tweeter side are not influenced by the radiation sound of each other. There is
no adverse effect, and since the two sound source positions are almost the same, the localization
of the sound image and the difference in phase become difficult to be obtained. Further, unlike
the conventional example in which the tweeter magnetic circuit is provided at the upper position
of the woofer magnetic circuit, the magnetic circuits on the woofer side and tweeter side are
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shared, so that the number of parts can be reduced and thickness reduction can be achieved. Can.
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5
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