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JPH06105392

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPH06105392
[0001]
FIELD OF THE INVENTION The present invention relates to the edge of a loudspeaker.
[0002]
2. Description of the Related Art In recent years, since the digital signal processing technology
has dramatically advanced and the quality of the electrical signal supplied to the speaker has
been greatly improved, a speaker capable of high-quality sound reproduction corresponding to
this has been strongly desired. There is. A conventional speaker will be described below with
reference to the drawings.
[0003]
FIG. 10 is a cross-sectional view of a conventional speaker, in which 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 a voice coil held in a magnetic gap formed by the outer
periphery of the center pole 4 and the inner peripheral surface of the yoke 2, 6 is a bobbin of the
voice coil 5, and 7 is a cone-shaped diaphragm fixed to the tip of the voice coil bobbin 6. , 8 is a
damper fixed to the outer peripheral portion of the voice coil bobbin 6, 9 is an edge provided on
the outer peripheral portion of the cone-shaped diaphragm 7, 10 is fixed to the outer periphery
of the damper 8 and the edge 9, and the plate 1, yoke 2, magnet 3 and It is a frame for holding a
magnetic circuit formed by the center pole 4.
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[0004]
In the above configuration, when an electric signal is applied to the voice coil 5, the driving force
generated in the voice coil 5 is transmitted to the voice coil bobbin 6 to vibrate the cone-shaped
diaphragm 7 fixed to the tip.
[0005]
In such a conventional speaker, the cone-shaped diaphragm 7 is supported by the damper 8 and
the edge 9 fixed to the outer peripheral portion of the voice coil bobbin 6, and the supporting
force linearity of these supports Is a problem particularly in the reproduction of a bass region
where the amplitude is large, and is a cause of harmonic distortion.
Further, the vibration state of the 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. Assuming that the amplitude value ξ in which the cone-shaped diaphragm 7
moves back and forth with respect to the neutral point is the same in each vibration state, the
amount of air excluded by the edge 9 oscillating with the cone-shaped diaphragm 7 is shown in
FIG. , When moving from the position of A to the state of B from U1, the movement of air from
the position of A to the state of C is U2, the deformation when the edge oscillates forward and
backward Because the method is different, the value will be different. The sound pressure
characteristic as a speaker is proportional to the sum of the cone-shaped diaphragm 7 and the
amount of air discharged by the edge 9, but the sound pressure radiated from the edge 9 has the
amount of removed air as described above. The sound pressure characteristics of the speaker
necessarily include distortion components because they differ depending on the movement of the
speaker.
[0006]
SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems,
and improves the linearity of supporting force of an edge which is a support of a diaphragm and
greatly reduces harmonic distortion due to asymmetry of air displacement. -The purpose is to
realize power.
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[0007]
SUMMARY OF THE INVENTION In order to achieve the above object, the present invention has a
corrugation shape in which the circumferential direction is divided into a plurality of pieces and
the sections of adjacent divided pieces are vertically symmetrical. An edge connected between
adjacent divided pieces and the divided pieces by a connecting part whose cross section
gradually changes continuously, a diaphragm joined to the inner periphery or outer periphery of
the edge, and the outer periphery or inner periphery of the edge It is characterized in that it is
constituted by a joined frame.
[0008]
According to the present invention, in accordance with the above construction, the edge is
divided into a plurality of pieces and the adjacent divided pieces are formed into a symmetrical
structure, so that the air excluded from one piece of the edge with the amplitude of the
diaphragm is removed. The combined amount of air excluded from one piece is equal to the
upper and lower amplitudes with respect to the neutral point when no electrical signal is applied,
regardless of which of the divided pieces connected to which connection.
Furthermore, the asymmetry of the supporting force due to the asymmetry of the structure can
also be improved.
[0009]
Embodiments of the present invention will be described hereinbelow with reference to the
drawings.
FIG. 1 is a view showing the structure of a loudspeaker according to a first embodiment of the
present invention, wherein FIG. 1 (a) is a plan view and FIG. 1 (b) is a sectional view taken along
the line A-A '. In the figure, the same components as in the conventional example shown in FIG.
10 are assigned the same reference numerals. The present embodiment largely differs from the
prior art in that the edge 11 is divided into four in the circumferential direction, and a partially
uneven shape is selectively used. However, in the conventional example, in order to make it easy
to explain the problem, the explanation was made using the edge consisting of one roll, but the
present invention is an improvement of the conventional corrugation edge, so this will be
explained. The following explanatory drawing shows a corrugation edge configured by
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combining one unevenness each. When the shape of this edge is divided into two in the radial
direction, the inner diameter side and the outer shape side have the same configuration, so only
the inner diameter side will be described for all the embodiments described later. 12, 13 are
convex rolls, 14, 15 are concave rolls which are vertically symmetrical with the convex rolls 12,
13. 16, 17, 18, 19 are connecting portions.
[0010]
The top view of the connection part 17 vicinity of the edge 11 is shown to Fig.2 (a). The convex
roll 13 and the concave roll 15 have a vertically symmetrical structure, and the connection
between the convex roll 13 and the concave roll 15 is made by the connecting portion 17 whose
cross section changes gradually and continuously. The connecting portion 17 is formed of two
shapes of convex and concave in cross section, and as shown in the cross-sectional view of each
portion of the connecting portion 17 in FIG. The diameter of the concave roll is large and the
diameter of the concave roll is small, and when the convex roll 13 is reached, the diameter of the
concave roll becomes zero and the same shape as the convex roll 13 is obtained. Conversely, the
diameter of the concave roll of the connecting portion 17 increases as it approaches the concave
roll 15 of the concave roll shape, the diameter of the convex roll decreases, and when the
concave roll 15 is reached, the diameter of the convex roll becomes zero and the concave roll It
becomes the same shape as 15.
[0011]
The operation of the above configuration will be described. When an electrical input is applied to
the voice coil 5, the convex rolls 12 and 13 and the concave rolls 14 and 15 connected by the
connecting portions 16, 17, 18 and 19 do not inhibit the vertical amplitude movement of the
cone diaphragm 7. It acts as a support for the cone diaphragm 7 and acoustically shields the
sound emitted from the back of the cone diaphragm 7 together with the connecting portions 16,
17, 18, 19. First, when the cone diaphragm 7 is oscillated upward, the convex rolls 12 and 13 are
in the state of B in the vibration mode of the roll-like edge shown in FIG. The rolls 14 and 15 are
formed by reversing the state of C in the vibration mode in the same figure in the vertical
direction, and the air displacement amount is U2. Next, when the cone diaphragm 7 vibrates
downward, the convex rolls 12 and 13 are in the state of C in the vibration mode of the rollshaped edge shown in FIG. The reference numeral 15 is a state in which the state of B in the
vibration mode in the same figure is vertically reversed, and the air displacement amount is U1.
That is, the composition of the amount of air eliminated by the pair of convex and concave rolls
for each of the upper and lower amplitudes is always constant at U1 + U2 and the asymmetry of
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the amount of air elimination is eliminated. The same is true for convex rolls and concave rolls
provided continuously to the connecting portions 16, 18 and 19.
[0012]
FIG. 6 shows sound pressure frequency characteristics of a 14-cm aperture speaker using the
edge of the present invention. It can be seen that harmonic distortion is very small in the low
frequency range. In addition, the same effect can be obtained even if the configuration shown in
FIG. 2 is modified and the convex roll and the concave roll are connected by the connecting
portion having the shape as shown in FIG. FIG. 3 (a) is a plan view in the vicinity of the
connecting portion in the second embodiment, and FIG. 3 (b) shows a cross section of each
portion shown in FIG. 3 (a).
[0013]
As described above, as in the present embodiment, the length direction is divided into a plurality
of divided pieces 12, 13, 14, 15, and the cross sections of adjacent divided pieces have a
vertically symmetrical structure, and the adjacent divided pieces An edge connected between the
piece and the divided piece via connecting portions 16, 17, 18, 19 whose cross sections are
gradually continuous, a diaphragm 7 connected to the inner periphery of the edge, and an outer
periphery of the edge By configuring the speaker with the frame 10, the combined amount of the
air excluded from one piece of the edge and the air excluded from the next one piece is equal to
each other with respect to the vertical amplitude of the diaphragm in each part Second-order
harmonic distortion of the sound pressure characteristics due to the asymmetry of the air
displacement amount of the edge and the asymmetry of the supporting force, which has
conventionally been generated, and a speaker with low distortion is provided. It becomes
possible.
[0014]
Next, a third embodiment of the present invention will be described with reference to the
drawings.
FIG. 4 is a view showing the structure of a loudspeaker according to a third embodiment of the
present invention, wherein FIG. 4 (a) is a plan view and FIG. 4 (b) is a sectional view taken along
the line B--B '. The present embodiment is different from the first embodiment in that the
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connecting portions 24, 25, 26, 27 are modified in shape, and the other configuration and
operation are the same as those of the first embodiment. Because of this, only the configuration
of the connecting part will be described in detail. Also, as in the first and second embodiments,
only the roll on the inner diameter side of the corrugation edge will be described.
[0015]
FIG. 5 (a) is a plan view in the vicinity of the connecting portion in the third embodiment, and
FIG. 5 (b) shows a cross section of each portion shown in FIG. 5 (a). FIG. 5 shows only the
connecting portion 25 and the vicinity thereof among the convex rolls 20 and 21 and the
concave rolls 22 and 23 and the four connecting portions 24 25 26 27 shown in FIG. There is.
Note that what will be described later is the same for the connecting portions 24, 26, 27 and the
concave and convex rolls in the vicinity thereof. In FIG. 5, 21 is a convex roll, 23 is a concave roll,
and 25 is a connecting part. The convex roll 21 and the concave roll 23 in the present
embodiment are vertically symmetrical as in the first embodiment, and the connection between
them is connected by the connecting portions 24, 25, 26, 27 whose cross section changes
gradually and continuously. It is done. As shown in FIG. 5, the connecting portion 25 is composed
of three convex rolls and two concave rolls in cross section, and as shown in FIG. 5 (b), the
connecting portion 25 approaches the convex roll-shaped divided piece 21. The diameter of the
convex roll 25 is large, the diameter of the concave roll is small, and the diameter of the concave
roll becomes zero at the part reaching the division pieces 21 and becomes the same shape as the
division pieces 21. Conversely, the diameter of the concave roll of the connection portion 25
becomes larger as the concave roll-shaped divided piece 23 is approached, the diameter of the
convex roll becomes smaller, and the diameter of the convex roll becomes zero at the part
reaching the divided piece 23 It has the same shape as the split piece 23. The operation and
effects of this embodiment are the same as those of the first embodiment, so the description will
be omitted.
[0016]
The connecting portion shown in the third embodiment may be modified to form the connecting
portion in a shape as shown in FIG. FIG. 7 (a) is a plan view in the vicinity of the connection
portion in the fourth embodiment, and FIG. 7 (b) shows a cross section of each portion shown in
FIG. 7 (a).
[0017]
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In the embodiment described above, four connection parts are provided, but two or more even
number of connection parts are used, and for each of the upper and lower amplitudes, a pair of
vertically symmetrical symmetrical corrugated segment pieces adjacent to the connection part As
long as the total amount of air to be eliminated is made constant, the asymmetry of the air
displacement and the asymmetry of the supporting force are eliminated, and the same effect as
in this embodiment is exerted. Further, based on this technical concept, the circumferential front
surface of the edge may be configured as shown in FIG. 8 and FIG. 9 only with the plurality of
connecting portions described in the first to fourth embodiments. Absent. However, in FIGS. 8
and 9, (a) is a plan view of the edge, and (b) shows a cross section of each part shown in (a), and
further, a combination of the connecting parts having these shapes is also used. It is possible.
[0018]
Further, the edge may be configured by combining the connecting portions having the shapes
shown in FIGS. 2 and 3 as appropriate, and various connecting portions having the shapes shown
in FIGS. 5 and 7 may be combined to form the edge. A variant is conceivable.
[0019]
Furthermore, the total roll width of each connecting portion does not necessarily have to be
equal to that of the divided pieces as in this embodiment, and may have a flat surface at the end.
[0020]
As described above, according to the present invention, if the edge is divided into a plurality of
pieces, and one piece is a convex roll, for example, the adjacent pieces are formed into a concave
roll to form a symmetrical structure. By connecting between the divided pieces by a connecting
part whose cross section gradually changes continuously, the air excluded from one piece of the
edge with respect to the upper and lower amplitudes of the diaphragm and the one piece from
the next are excluded This makes it possible to equalize the combined amount with the air at
each adjacent piece, thereby significantly reducing the second harmonic distortion of the sound
pressure characteristic caused by the asymmetry of the air removal amount of the edge which
has conventionally occurred.
Furthermore, the asymmetry of the supporting force due to the asymmetry of the edge structure
can be improved to provide a speaker with extremely low distortion.
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