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DESCRIPTION JP2000078690

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DESCRIPTION JP2000078690
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker used in various acoustic devices.
[0002]
2. Description of the Related Art The prior art will be described with reference to a crosssectional view in the longitudinal direction of the elliptical speaker shown in FIG.
[0003]
According to the figure, the frame 6 is coupled to the upper plate 2 of the magnetic circuit 5
constructed by overlappingly combining the magnet 1 and the upper plate 2 on the lower plate 4
having the center pole 3, and this frame 6 The diaphragm 7 is adhesively bonded to the
peripheral portion of the head, and the intermediate portion of the voice coil 8 coupled to the
central portion is driven by the damper 9 so as to be fitted into the magnetic gap 10 to drive the
diaphragm 7. The dust cap 11 is adhered to the surface of the connecting portion of the
diaphragm 7 and the voice coil 8.
[0004]
However, the above-mentioned speaker is a soft support system (diaphragm that can make the
voice coil 8 small and have large amplitude so as to be compatible with small size, deep bass
reproduction, high input resistance, etc.) 7), when a large input is applied as shown in FIG. 7, the
amplitude of the vibration system becomes large, causing rolling, weakening the center holding
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power of the support system, and the voice coil A gap failure or a high gap failure (a normal gap
failure occurs due to a large amplitude due to a relatively large signal input to the voice coil 8)
that 8 oscillates up and down while being biased and contacts the center pole 3 of the lower
plate 4 On the other hand, there is a problem that the input signal is likely to be generated when
the voice coil 8 is swayed at a specific relatively high frequency. It was.
[0005]
The gap defects and high gap defects affect the shape of the support system and the voice coil 8
due to factors such as the winding of a tinsel wire (not shown) connecting the voice coil 8 and
the input terminal. It is thought that it occurs near the limit value due to the lack of well-balanced
support.
[0006]
The present invention solves the above-mentioned problems, and provides an excellent speaker
which can realize small size, deep bass reproduction and high input resistance, and can suppress
the occurrence of gap defects or high gap defects.
[0007]
SUMMARY OF THE INVENTION In order to solve the above problems, the speaker of the present
invention comprises a lower plate having a center pole, a magnet and a top plate superimposed
on the lower plate, and the center pole and the top plate. A magnetic circuit having a magnetic
gap formed therebetween, a frame coupled to the magnetic circuit, and a vibration coupled to the
frame and coupled to the voice coil embedded in the magnetic gap. It consists of a plate and a
notch in the direction of bias where the voice coil is biased when the diaphragm provided on the
center pole is driven in amplitude, thereby suppressing contact of the voice coil to the center
pole. We provide excellent speakers that can reduce the size of gap defects or high gap defects
and achieve compactness, deep bass reproduction, and high input resistance. Than is.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION According to the first aspect of the present
invention, there is provided a lower plate having a center pole, a magnet and a top plate
superposed on the lower plate, and a magnet between the center pole and the top plate. A
magnetic circuit having a gap, a frame coupled to the magnetic circuit, and a diaphragm coupled
to the frame with an outer peripheral edge coupled to the voice coil having an inner peripheral
edge embedded in the magnetic gap; And a notch in the bias direction in which the voice coil is
biased at the time of the amplitude vibration of the diaphragm provided at the center pole, and
the gap between the voice coil and the center pole is suppressed by suppressing contact with the
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center pole. It provides an excellent speaker in which the occurrence of high gap defects is
suppressed.
[0009]
According to a second aspect of the present invention, there is provided a lower plate having a
center pole, and a magnet formed by superposing a magnet and a top plate on this and forming a
magnetic gap between the center pole and the top plate. An elliptical diaphragm coupled to the
circuit, an elliptical frame coupled to the magnetic circuit, and an outer circumferential edge
coupled to the elliptical frame, and an inner circumferential edge coupled to the voice coil
embedded in the magnetic gap. And a notch provided in the major axis direction of the
diaphragm of the center pole, which is caused by the shape of an elliptical (including elliptical,
oval, track-like elongated shape, etc.) speaker A gap defect and a high gap defect due to the bias
in the major axis direction at the time of the amplitude of the voice coil are prevented.
[0010]
According to a third aspect of the present invention, another notch is provided in the minor axis
direction of the diaphragm of the center pole according to the second aspect, and at the time of
the amplitude of the voice coil due to the speaker shape. It prevents gap defects and high gap
defects due to deviation in the minor axis direction, which is one of the major factors next to the
major axis direction.
[0011]
According to a fourth aspect of the present invention, the center pole and the lower plate of the
first aspect are separately formed so that the direction of the notch can be adjusted in the
rotational direction, and fixed after adjustment. It is possible to adjust the direction of the
notched portion of the center pole in a moving state close to the completion of the speaker, such
as (high) gap defects which are not attributed to the speaker shape and fine adjustment of the
notch direction of the notch.
[0012]
Hereinafter, an embodiment of a loudspeaker according to the present invention will be
described with reference to FIGS. 1 to 5. FIG.
[0013]
Embodiment 1 FIG. 1 is a cross-sectional view of the long diameter side of an elliptical speaker
according to an embodiment of the speaker of the present invention, and FIG. 2 is a lower portion
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having a center pole which is the same as the main part. FIG. 3 is a perspective view of a plate,
FIG. 3 is a top view of the same, and FIG. 4 is a top view of the same development example.
[0014]
According to the figure, the frame 26 is coupled to the upper plate 22 of the magnetic circuit 25
constructed by superposing the magnet 21 and the upper plate 22 on the lower plate 24 having
the center pole 23, and the outside of the frame 26. The outer peripheral edge of the diaphragm
27 is adhesively bonded to the peripheral edge portion, and the inner peripheral edge is
adhesively bonded to the voice coil 28 so as to fit in the magnetic gap 30 between the top plate
22 of the magnetic circuit 25 and the center pole 23 It is a thing.
[0015]
A damper 29 has an inner peripheral edge bonded and bonded to the voice coil 28 and an outer
peripheral edge bonded and connected to the frame 26. A dust 31 is bonded to the upper surface
of the connecting portion of the diaphragm 27 with the voice coil 28. It is a cap.
[0016]
The center pole 23 has notches 40 as shown in FIG. 2. The notches 40 are provided on both
sides of the diaphragm 27 of the elliptical speaker as shown in FIG. It is a thing.
[0017]
With the above configuration, the gap of the magnetic gap 30 in the major axis direction which
tends to be biased at the time of the amplitude of the voice coil 28 is expanded, the distance
between the voice coil 28 and the center pole 23 is secured, and gap defects and high gap
defects are prevented. It is a thing.
[0018]
That is, in the above embodiment, since the shape of the speaker is elliptical, different vibration
modes are generated in the major axis direction and the minor axis direction, and this causes a
mechanism to induce gap and high gap defects by rolling. In particular, rolling often occurs
significantly in the major axis direction where the weight balance tends to break down.
Therefore, two notches 40 are provided in the center pole 23 in the major axis direction, and the
distance between the voice coil 28 and the center pole 23 is The configuration is to secure.
[0019]
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FIG. 4 is a development example of the above embodiment, and another notch 41 is provided
also in the short diameter direction to correspond to the short diameter direction in which rolling
occurs next in the long diameter direction. The present invention is effective for rolling in both
major axis and minor axis directions, and can prevent gap defects and high gap defects.
[0020]
In the above embodiment, an elliptical speaker has been described. However, the present
invention is also effective when applied to general loudspeakers having a major axis and a minor
axis, and the elliptical speaker has an elliptical shape. In addition to the above, oval, track, and
elongated speakers are also included.
[0021]
Second Embodiment Another embodiment of the present invention will be described with
reference to FIG.
The same parts as in the first embodiment are assigned the same reference numerals and
explanations thereof will be omitted.
[0022]
FIG. 5 is a perspective view of the lower plate which is an essential part of another embodiment
of the present invention, and the lower plate 24a is constructed as a separate component from
the center pole portion 23a and the lower plate portion 24b. The lower plate portion 24b is
press-fitted and held to the lower plate portion 24b so as to be rotatable. Even if the direction of
the notch 40 is slightly deviated due to an assembly error during the speaker assembly, the
rotational adjustment can be performed at the completion stage.
[0023]
That is, it is possible to correct the gap defect after assembling it and to make it non-defective.
[0024]
If the direction of notch 40 is adjusted from the shape of the speaker as in the first embodiment,
it is possible to cope with it by performing assembly with high accuracy, but as described above,
the support system Particularly in the final stage of assembling the speaker, in the case of
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confirming and adjusting the bias direction of the voice coil 28 at the final stage of assembling
the speaker. .
[0025]
Therefore, it is needless to say that the present invention can be applied not only to the elliptical
speaker in the above embodiment, but also to a circular cone in general.
[0026]
In the above embodiment, the center pole portion 23a is described as being press-fit held to the
lower plate portion 24b so as to be rotatable, but if the direction of the notch 40 can be adjusted
Other known means such as screwing the two may be used.
[0027]
As described above, according to the present invention, gap defects are suppressed by providing
the center pole with a notch corresponding to the voice coil bias direction at the time of the
amplitude of the voice coil of the speaker. It is intended to provide an excellent speaker that can
be input.
[0028]
As described above, according to the speaker of the present invention, the notch portion of the
center pole corresponding to the bias direction at the time of the amplitude of the voice coil, the
notch portion of the center pole at the gap position where the voice coil easily contacts Of the
voice coil and the center pole, and the gap failure and the high gap failure are suppressed, and
the excellent speaker with high input resistance and the ability to reproduce heavy bass can be
provided and the performance is greatly improved. It is possible.
[0029]
Brief description of the drawings
[0030]
1 cross-sectional view of the long diameter side of the embodiment of the speaker of the present
invention
[0031]
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Fig. 2 A perspective view of the lower plate which is the main part
[0032]
Figure 3 same top view
[0033]
Fig. 4 Top view of the other embodiment
[0034]
5 is a perspective view of the lower plate which is the main part of the other embodiment
[0035]
Fig. 6 Cross-sectional view of a conventional speaker
[0036]
Fig. 7 Cross section of the conventional speaker when rolling occurs
[0037]
Explanation of sign
[0038]
21 Magnet 22 Upper plate 23 Center pole 23a Center pole 24 Lower plate 24a Lower plate 24b
Lower plate 25 Magnetic circuit 26 Frame 27 Diaphragm 28 Voice coil 29 Damper 30 Magnetic
gap 40, 41 Notch
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