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JPH07203589

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DESCRIPTION JPH07203589
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker with little leakage magnetism which is disposed in various kinds of audio equipment and
radiates sound in both directions front and back centering on a magnetic circuit.
[0002]
2. Description of the Related Art A conventional speaker 30 of this type, as shown in FIG. 3, has a
magnetic circuit 34 composed of a yoke 31, a top plate 32 and a magnet 35, and between the
yoke 31 and the top plate 32. A ring-shaped magnetic air gap 33 is formed, and a frame 40 is
mounted on the magnetic circuit 34, and a voice coil 36 connected to an external electrical input
is loosely supported in the magnetic air gap 33. The vibration coil is attached to the frame 40 by
a vibration system formed of a damper 38, a diaphragm 39 and the like concentrically fixed to a
voice coil bobbin 37 on which the voice coil 36 is wound. 41 is a dust cap, and 42 is a gasket for
pressing the outer periphery of the diaphragm 39 against the frame 40.
[0003]
Therefore, in the magnetic circuit 34 of the conventional speaker 30 of this type, the magnetic
leakage from the peripheral portion of the magnet 35 is large, which may affect other devices in
the periphery. I was there. Further, since only one set of the magnetic gap 33 is provided, only
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one set of vibration system having the single vibration plate 39 can be attached, so that there is a
problem that the sound can be radiated only in one direction.
[0004]
Therefore, in order to solve the problems of the conventional speaker 30 as described above, the
present invention, as shown in FIG. 1, is a normal outside in which the annular magnetic gap 3 to
which the ring magnet 5 is attached is formed. The center pole 2 of the magnetic type magnetic
circuit is extended backward to form the extension 2a, and the outer edge of the top plate 6 is
extended outward and joined to the outer edge of the wedge-shaped outer yoke 4; By forming an
annular magnetic gap 3a between the center hole provided at the center of the yoke 4 and the
extension 2a of the center pole 2, annular magnetic gaps 3,3a in the front and back sides of the
ring magnet 5 are formed. By providing the above-described configuration, it is possible to
provide a two-way radiation speaker 23 equipped with a magnetic circuit 15 capable of emitting
acoustic radiation in both directions and minimizing the leakage magnetism.
[0005]
The configuration of the present invention for achieving the above object will be described with
reference to FIGS. 1 and 2 corresponding to the embodiments. The present invention has a ringshaped magnet 5 mounted thereon, In the magnetic circuit 15 in which the annular magnetic gap
3 is formed, the lower end of the center pole 2 vertically erected at the center of the inner plate 1
forms an extended end 2a extended to the rear of the inner plate 1, and The outer edge of 6 is
extended outward and joined to the outer edge of the wedge-shaped outer yoke 4 and between
the center hole provided at the center of the outer yoke 4 and the extended end 2 a of the center
pole 2 It is a bidirectional radiation speaker 23 having a configuration in which the magnetic
circuit 15 in which the annular magnetic air gaps 3a are formed and the annular magnetic air
gaps 3 and 3a are formed in the front and back sides of the ring magnet 5 is formed.
[0006]
Therefore, since the bidirectional radiation speaker 23 of the present invention has such a
structure, the frames 10 and 20 attached to the front and back outer surfaces with the magnetic
gap 3, 3a of the magnetic circuit 15 as the center. The magnetic circuit 15 is mounted by
mounting the outer periphery of an acoustic radiation vibration system in which the diaphragms
9 and 19, the voice coils 7a and 17a, the bobbins 7 and 17, and the dampers 8 and 18 are
concentrically assembled and joined. Can radiate sound in both directions.
[0007]
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As a result, the sound from the diaphragm 9 (, 19) of one of the acoustic radiation vibration
systems and the sound from the other diaphragm 19 (, 9) in the front-rear direction on the axis
of the speaker 23. The sound pressure of the two diaphragms 9 and 19 can be mutually added in
one direction by attaching to the reflection type cabinet which can radiate in the same direction.
Also, in this case, the characteristics of the front and rear diaphragms 9 and 19 can be changed
as in the case of a woofer and a tweeter, for example, and a single speaker can have various
characteristics.
Further, since the outer edge of the top plate 6 expanded outward is joined to the outer edge of
the wedge-shaped outer yoke 4, the peripheral portion of the ring-shaped magnet 5, ie, the inner
plate 1 or the top plate 6 Since the leakage magnetism leaked from the junction etc. can be
shielded, the possibility of adversely affecting other devices around the speaker 23 can be
eliminated.
[0008]
Embodiments of the present invention will be described below with reference to the drawings.
1 and 2 show an embodiment of the present invention, and FIG. 1 is a cross-sectional view of a
speaker according to the present invention. FIG. 2 is a cross-sectional view of a magnetic circuit
used in the speaker of the present invention. As shown in FIGS. 1 and 2, 1 is a flat disk-like inner
plate made of magnetically soft soft iron, and a center pole 2 is vertically erected at the center of
the plate. The center pole 2 is extended rearward of the inner plate 1 to form an extension 2a.
[0009]
Then, the ring-shaped magnet 5 is concentrically mounted on the inner plate 1, and the top plate
6 is further mounted thereon, and a hole drilled in the center of the top plate 6, and the center
pole An annular magnetic gap 3 is formed between the two. Further, the outer edge of the top
plate 6 is extended outward and joined to the outer edge of the wedge-shaped outer yoke 4 to
form a center hole drilled in the center of the bottom of the wedge-shaped yoke 4; An annular
magnetic gap 3a is formed between the second extension 2a and the second extension 2a.
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[0010]
Therefore, the magnetic circuit 15 is a magnetic circuit having a structure having magnetic gaps
3, 3a at the front and back with the ring-shaped magnet 5 as the center. Frames 10 and 20 are
attached to the front and back surfaces of the magnetic circuit 15 having such a structure, and
voice coils 7a and 17a connected to an external electrical input are loosely supported in the
magnetic gaps 3 and 3a. Mounted on the frame 10, 20 by an acoustic radiation vibration system
formed of dampers 8, 18 concentrically fixed to a voice coil bobbin 7, 17 on which the voice coil
7a, 17a is wound, and diaphragms 9, 19 etc. It is done. Reference numerals 11 and 21 denote
dust caps, and reference numerals 12 and 22 denote gaskets for pressing the outer periphery of
the diaphragms 9 and 19 against the frames 10 and 20, respectively.
[0011]
As described above, according to the speaker 23 of the present invention, the annular magnetic
air gaps 3 and 3a are formed in the front and back surface direction of the ring magnet 5, so that
the sound can be radiated in the front and back directions of the magnetic circuit 15. The
operation of the loudspeaker having the dual gap magnetic circuit of the present embodiment
configured as described above will be described. Inputs from the same or independent signal
sources are applied to the voice coils 7 and 17, and the diaphragms 9 and 19 can be driven
independently.
[0012]
The ability to operate these two sets of speakers has many advantages. Although the outer pole
of the center pole 2 is described as a speaker having the same diameter in the upper part and the
lower part, it may be of course different in diameter. That is, if one is used as a speaker for bass
radiation and the other is used as a speaker for high-sound radiation, reproduction can be
performed with extremely good sound quality for HiFi reproduction as a two-way speaker.
Furthermore, by attaching different types of speakers, it is possible to reproduce various sound
quality by various sound effects. Although the embodiments considered to be representative of
the present invention have been described above, the present invention is not necessarily limited
to only the structure of these embodiments, and includes the above-described components
according to the present invention, and the present invention In order to achieve the purpose
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mentioned above, the present invention can be suitably modified and implemented within the
range having the effects mentioned below.
[0013]
As is apparent from the above description, the loudspeaker according to the present invention is
a magnetic circuit in which the mounted magnetic circuit has extremely good usage efficiency of
a single ring-shaped magnet, and has extremely low magnetic leakage. Therefore, two sets of
speakers can be operated in front and back directions of one magnetic circuit, which is an
excellent speaker for HiFi reproduction. Moreover, compared with the case where two sets of
speakers are assembled separately, it is possible to reduce the part material cost and the number
of steps, and thus there is a remarkable effect that the cost can be reduced.
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