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JPH05183990

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DESCRIPTION JPH05183990
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
dome-shaped speaker for use in an audio output device or the like.
[0002]
2. Description of the Related Art A typical prior art will be described with reference to FIG. FIG. 2
is a half sectional view of a conventional dome-shaped speaker, and a disk-shaped bottom plate 7
having through holes of such a size that the thickness of the pole is the same as the thickness t1
of the top plate 5 in the pole portion A ring-shaped magnet 6 is attached in the vicinity of the
upper outer peripheral edge, and a donut-shaped top plate 5 is attached to the upper part
thereof. In addition, a nonmagnetic sound absorbing material 18 (for example, glass wool) is
attached to the inside of the through hole. The edge 2 of the diaphragm 1 is fixed to a frame 3
attached to the top of the top plate 5. A magnetic gap is formed between the upper end 9 of the
bottom plate 7 and the inner surface 10 of the top plate 5, and the voice coil 4 supported and
supported by the diaphragm 1 and the edge 2 is located here.
[0003]
By the way, in the dome type speaker, it is necessary to make the through hole diameter of the
pole portion of the bottom plate as large as possible in order to minimize the adverse effect due
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to the back pressure to the speaker diaphragm. However, in the above-described conventional
configuration, since the cross-sectional area of the pole portion of the speaker magnetic circuit is
reduced, magnetic saturation occurs and the magnetic flux density of the magnetic gap portion is
reduced.
[0004]
The present invention solves such conventional problems, and makes it possible to minimize the
adverse effect of the back pressure on the speaker diaphragm and to prevent the reduction of the
magnetic flux density in the magnetic gap portion.
[0005]
SUMMARY OF THE INVENTION In order to solve the above problems, the loudspeaker of the
present invention has a construction using a sound absorbing material containing a magnetic
material inside the through hole of the pole portion of the bottom plate.
[0006]
According to this configuration, the sound absorbing material attached to the inside of the
through hole of the pole portion of the bottom plate can also be used as a magnetic path, so that
the decrease in the magnetic flux density of the magnetic gap portion can be suppressed.
[0007]
An embodiment of the present invention will be described below with reference to FIG.
Only the sound absorbing material attached to the inside of the pole is different from the prior
art, and the other structures are the same as those described in the prior art, and therefore the
same reference numerals are given and the description is omitted.
The conventional sound absorbing material 18 is a nonmagnetic material, but in the embodiment
of the present invention, a magnetic material (for example, steel wool) is used as the sound
absorbing material 8.
Although steel wool is used as the sound absorbing material in this embodiment, it is needless to
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2
say that a material obtained by foaming a resin containing a magnetic material may be used as
the sound absorbing material.
[0008]
As is apparent from the description of the above embodiments, the present invention uses the
magnetic sound absorbing material as the sound absorbing material, so the magnetic flux density
of the magnetic gap portion is larger than when using the nonmagnetic sound absorbing
material. can do. For example, outer diameter φ125 of bottom plate, through hole diameter φ46
of pole, thickness 8 of bottom plate, outer diameter φ130 of magnet, inner diameter φ75,
thickness 20, outer diameter φ125 of top plate, inner diameter φ62, thickness 7, thickness of
sound absorbing material When steel wool is used as the sound absorbing material, the magnetic
flux density of the magnetic gap portion can be increased by about 5% as compared with the case
where the conventional non-magnetic sound absorbing material is used.
[0009]
Further, since the sound absorbing material attached to the inside of the through hole of the pole
portion of the bottom plate can also be used as a magnetic path, the adverse effect due to the
back pressure on the speaker diaphragm is minimized and the magnetic flux density of the
magnetic gap portion is reduced. It is possible to suppress the drop, to increase the output sound
pressure, and to improve the electric braking and to improve the damping, and to make the
sound with a sharp sense of speed, which has a great industrial value. .
[0010]
Brief description of the drawings
[0011]
1 is a half sectional view of a dome-shaped speaker according to an embodiment of the present
invention
[0012]
Fig. 2 Half-sectional view of a conventional dome-shaped speaker
[0013]
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3
Explanation of sign
[0014]
5 top plate 6 magnet 7 bottom plate 8 sound absorbing material containing magnetic material
(steel wool etc.)
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