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JPH06315194

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH06315194
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
loudspeaker, in particular to its edge.
[0002]
2. Description of the Related Art In recent years, television sets have been made compact, and
speakers having an oval or rectangular shape with a good space factor, which can be mounted on
both sides of a cathode ray tube in front of the television set, are used.
[0003]
Hereinafter, the conventional elliptical speaker as described above will be described with
reference to the drawings.
[0004]
FIG. 5 (a) is a top view of a conventional elliptical speaker, and FIG. 5 (b) is a sectional view of the
Y-Y 'structure.
In FIG. 5, 1 is a plate, 2 is a yoke integrally formed with the plate 1, 3 is a magnet fixed to the
plate 1, 4 is a center pole fixed to the upper surface of the magnet 3, 5 is an outer periphery of
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the center pole 4 and the yoke A voice coil held in a magnetic gap formed by the inner
circumferential surface of 2, 6 is a bobbin of the voice coil 5.
7 is an elliptical diaphragm fixed to the end of the voice coil bobbin 6, 8 is a damper fixed to the
outer periphery of the voice coil bobbin 6, 9 is an edge provided on the outer periphery of the
elliptical diaphragm 7, 10 is an outer periphery of the damper 8 and the edge 9 To hold the
magnetic circuit composed of the plate 1, the yoke 2, the magnet 3 and the center pole 4.
[0005]
In the above configuration, when an electric signal is applied to voice coil 5, a driving force is
generated in voice coil 5 under the influence of the magnetic field generated between center pole
4 and yoke 2, and this driving force is transmitted to voice coil bobbin 6. Thus, the elliptical
diaphragm 7 fixed to the tip is vibrated.
[0006]
In such a conventional speaker, the elliptical diaphragm 7 is supported by the damper 8 and the
edge 9 fixed to the outer periphery of the voice coil bobbin 6, and the linearity of the supporting
force of these supports is In particular, it is a problem at the time of reproduction of a bass
region where the amplitude becomes large, and is a cause of generation of harmonic distortion.
In order to improve the straightness of such a support, various shapes have been devised for the
damper 8 and the edge 9. As a result, it is the roll shape as shown in FIG. 5 that is most
commonly used as the edge 9 at present, and the linearity of the supporting force of the support
is considerable by the combination with the wave-shaped damper 8. It has been improved.
[0007]
However, the edge of the roll shape includes a distortion component in the sound emitted from
the edge. This situation will be described below.
[0008]
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First, the vibration mode of the roll-shaped edge 9 is as shown in FIG. In the figure, A represents
a neutral state before an electric signal is applied to the voice coil 5, B represents a state
vibrating forward of the neutral point, and C a state of vibrating rearward from the neutral point.
In each vibration state, the amplitude value ξ in which the elliptical diaphragm 7 moves back
and forth with respect to the neutral point is the same. That is, the edge 9 is not non-linear in its
operation as a support of the elliptical diaphragm.
[0009]
However, as is clear from FIG. 6, the amount of air removed by the edge 9 oscillating with the
elliptical diaphragm 7 is U1 and the amount of air from the position of A to the state of C from
the position of A to the state of B. Assuming that the amount of air in the case of moving to U2 is
U2, the roll shape of the edge is deformed to a different value. That is, the sound pressure
characteristic as a speaker is proportional to the sum of the elliptical moving plate 7 and the
amount of air excluded by the edge 9, but the sound pressure emitted from the edge 9 excludes
the amount of air as described above. The sound pressure characteristic of the speaker
necessarily includes the distortion component because it differs depending on the back and forth
movement. Furthermore, in the elliptical speaker, since the rigidity in the long side direction of
the diaphragm is weaker than that in the short side direction, it is desirable that the edge has a
shape in consideration of the rigidity of the diaphragm to suppress split resonance in the long
side direction as much as possible.
[0010]
The present invention solves the above-mentioned problems, significantly reduces the distortion
component caused by the edge shape without deteriorating the linearity of the supporting force
of the edge which is the support of the diaphragm, and also makes the edge shape It is an object
of the present invention to realize a speaker with less deterioration of the sound pressure
characteristic resulting therefrom.
[0011]
SUMMARY OF THE INVENTION In order to achieve the above object, the loudspeaker of the
present invention comprises a diaphragm having an oval or rectangular outer shape, and an edge
for supporting the outer periphery of the diaphragm. The edge has a connecting portion at
substantially the center of at least one of two pairs of long sides or short sides facing each other,
and the edge divided by the connecting portion is adjacent to each other The sides are vertically
symmetrical with each other.
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[0012]
According to the present invention, according to the above configuration, the amount of air
excluded from one side of the edge divided by the connecting portion and the amount of air
excluded from the next side are electric due to the amplitude of the diaphragm. It is symmetrical
with respect to the neutral point to which the signal is not applied, and the combined excluded
air amount is equal to the upper and lower amplitudes.
If the connecting portion is provided at the central portion of the opposing long side, the rigidity
of the connecting portion can be increased to suppress split resonance in the long side direction
of the rectangular or elliptical diaphragm.
[0013]
Embodiments of the present invention will be described hereinbelow with reference to the
drawings.
[0014]
FIG. 1 is a plan view of the loudspeaker according to the first embodiment of the present
invention, and the cross-sectional structure along the line XX ′ is the same as that of the
conventional loudspeaker shown in FIG. .
In the figure, the same components as those in the conventional example shown in FIG.
[0015]
A major difference from the prior art is the structure of the edge 11.
Reference numeral 12 is a convex roll, 13 is a concave roll, and 14 and 15 are connecting
portions. 2 (a) is a plan view in the vicinity of the connecting portion 14, and FIG. 2 (b) shows a
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cross section of each portion shown in FIG. 2 (a). As shown in FIG. 2 (b), the diameter of the
convex roll of the connecting portion 14 is large and the diameter of the concave roll is small as
it approaches the convex divided side roll 12, and the concave roll at the part reaching the
divided side 12 The diameter of x is zero and has the same shape as the divided side 12.
Conversely, the diameter of the concave roll of the connection portion 14 is large as the
approaching side of the division side roll 13 of the concave roll shape, the diameter of the convex
roll becomes small, and the diameter of the convex roll becomes zero at the portion reaching the
division side 13 It has the same shape as the divided side 13. Since the vicinity of the connecting
portion 15 is also completely the same as the above-described structure, the description will be
omitted.
[0016]
The operation of the above configuration will be described. When an electrical input is applied to
the voice coil 5, the convex roll 12 and the concave roll 13 connected by the connecting portions
14 and 15 move up and down the amplitude of the elliptical diaphragm 7. Act as a support for
the elliptical diaphragm 7 without inhibiting the
[0017]
First, when the elliptical diaphragm 7 vibrates upward, the convex roll 12 is in the state of B in
the vibration mode of the roll-like edge shown in FIG. 6, that is, the air removal amount becomes
U1, while the concave roll The reference numeral 13 shows the state of C in the vibration mode
shown in the same figure inverted in the vertical direction, and the air displacement amount is
U2.
[0018]
Next, when the elliptical diaphragm 7 vibrates downward, the convex roll 12 is in the state of C
in the vibration mode of the roll-like edge shown in FIG. 6, that is, the air displacement amount is
U2, and the concave roll 13 is the same. The state of B in the vibration mode shown in FIG.
[0019]
That is, the combined amount of the amount of air excluded by the convex roll and the concave
roll with respect to the upper and lower amplitude is constant at U1 + U2.
Therefore, the second harmonic distortion of the sound pressure due to the asymmetry of the air
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displacement at the edge is significantly reduced.
In the elliptical diaphragm, the rigidity in the long side direction is weaker than in the short side
direction, but the connecting portions 14 and 15 have a shape in which the diameter of the roll
changes in the long side direction. On the other hand, there is an effect of suppressing the split
resonance of the elliptical diaphragm 7 strongly.
[0020]
Next, a second embodiment of the present invention will be described with reference to the
drawings.
FIG. 3 shows a plan view of a loudspeaker according to a second embodiment of the present
invention. In the figure, 20 is a rectangular diaphragm, 21 is a frame, 16 is a convex roll, 17 is a
concave roll, and 18 and 19 are connecting portions. The present embodiment differs from the
first embodiment in the shape of the diaphragm 20. The edge 22 exhibits the same effect as in
the first embodiment, but if the external dimensions of the speaker and frame using the elliptical
diaphragm are the same as in the first embodiment. Since the diaphragm area on the short side
can be made large, there is an advantage that the reproduction sound pressure level can be
improved.
[0021]
Next, a third embodiment of the present invention will be described with reference to the
drawings. FIG. 4 is a plan view of a loudspeaker according to a third embodiment of the present
invention. The same reference numerals as in the third embodiment denote the same constituent
elements as in the third embodiment. In FIG. 4, reference numerals 24 and 27 denote convex
rolls, reference numerals 25 and 26 denote concave rolls, and reference numerals 28, 29, 30 and
31 denote connecting parts. As shown in FIG. 2, these connecting portions have a structure in
which the shape gradually changes from the adjacent convex roll to the concave roll. The present
embodiment is different from the previous embodiments in that the connecting portion is also
provided on the short side of the rectangular diaphragm. The amount of air removed by the edge
23 along with the vertical amplitude movement of the rectangular diaphragm 20 is the combined
amount of the convex rolls 24 and 27 and the concave rolls 25 and 26, and the asymmetry of the
amount of air exclusion is the second The improvement is the same as in the embodiment of FIG.
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When the rigidity of the diaphragm is high, the distance between the convex roll and the concave
roll is reduced by adopting such a configuration, so that there is an advantage that the synthesis
of the air displacement amount is performed more uniformly.
[0022]
As described above, according to the present invention, the edge shape of the elliptical or
rectangular diaphragm supporting the outer periphery of the diaphragm is substantially the
same as that of at least one pair of opposing long sides or short sides. A connecting part is
provided at the center, the edge is divided into a plurality of sides, adjacent sides are vertically
symmetrical, and air excluded from one side of the edge with respect to the vertical amplitude of
the diaphragm, and the adjacent 1 By equalizing the combined amount of air excluded from the
two sides, the second harmonic distortion of the sound pressure characteristic caused by the
asymmetry of the air exclusion generated at the conventional roll-shaped edge is greatly reduced.
It is a thing. In addition, by providing the connecting portion in the long side direction of the
edge, the bending strength of the weak elastic elliptical or rectangular diaphragm is increased in
the longitudinal direction, and the divided resonance of the diaphragm is suppressed to provide
flat sound pressure characteristics. A low distortion speaker can be provided.
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