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JP2002142291

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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 JP2002142291
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
loudspeaker having directivity characteristics symmetrical with respect to a central axis of the
loudspeaker.
[0002]
2. Description of the Related Art FIG. 4 is a longitudinal sectional view of a conventional speaker
and a front view thereof, FIG. 5 is a directivity characteristic diagram asymmetric with respect to
the central axis of the speaker, and FIG. 7 to 9 are directivity characteristic diagrams asymmetric
with respect to the central axis of a speaker using a diaphragm obtained by thermoforming a
plastic sheet.
[0003]
As shown in FIG. 4, the conventional speaker has a yoke 1, a magnet 2, a plate 3, a bobbin 4, a
voice coil 5, a diaphragm 6, an edge 7, a dust cap 8, a lead 9, and an input terminal. 10, a frame
11 is provided.
The diaphragm 6 described above is manufactured by laminating of paper, paper making,
vacuum forming of a plastic sheet, press forming of metal, or the like.
03-05-2019
1
[0004]
Further, on the diaphragm 6, one pair of lead wires 9 for supplying an electric signal supplied
from the input terminal 10 to the voice coil 5 is disposed in one direction (arrow A direction). As
shown in FIGS. 6A and 6B, the pair of lead wires 9 and 9 are arranged at one end in the arrow A
direction or in the arrow B direction.
[0005]
As described above, since the pair of lead wires 9 is arranged in one direction on the diaphragm
6 (FIGS. 6A and 6B), the directivity characteristic of the speaker is the central axis c of the
speaker. It becomes asymmetric with respect to it (FIG. 5). That is, in the directivity
characteristics shown in FIG. 5, the characteristics a and b are asymmetric with respect to the
central axis c, and the characteristics a and b do not overlap. Here, the characteristic a is the
directivity characteristic of the speaker when the test signal of 10 kHz is reproduced by the
speaker using the diaphragm shown in FIG. The characteristic b is the directivity characteristic of
the speaker when the test signal of 10 kHz is reproduced on the speaker using the diaphragm
shown in FIG. 6 (B). The directivity characteristics c, d, and e shown in FIGS. 7 to 9 are
asymmetric with respect to the central axis c. Here, the characteristics c to e are directivity
characteristics of the speaker when a test signal of 10 kHz is reproduced on the speaker using a
diaphragm obtained by thermoforming a plastic sheet.
[0006]
SUMMARY OF THE INVENTION When performing stereo reproduction using two speakers
having directivity characteristics having asymmetry with respect to the central axis of the
speakers, the directivity characteristics of the respective speakers vary and moreover Since the
variations are not uniform, there is a possibility that sound field localization with a good sense of
reality can not be obtained. The reason for this is that in the conventional speaker production
process, management is focused on only the on-axis characteristic of the speaker in a single
speaker, and there is good realism in stereo reproduction using a plurality of single speakers of
the same type. This is because product management has not been carried out to align the
characteristics of a plurality of speakers so as to obtain proper sound field localization.
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2
[0007]
Therefore, the present invention is provided with a diaphragm having a symmetrical shape with
respect to the central axis of the speaker, and a plurality of lead wires and a plurality of dummy
wires are arranged at equal angular intervals all around the frame supporting the diaphragm.
With this configuration, it is possible to manufacture a speaker having directional characteristics
symmetrical with respect to the central axis of the speaker, and by using a plurality of such
single speakers alone for stereo reproduction, the presence feeling is good without any special
adjustment. It aims at providing a speaker by which sound field localization is obtained.
[0008]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present
invention provides the following loudspeakers.
That is, as shown in FIG. 1 and FIG. 10 to FIG. 13, the diaphragm 6A resin-molded in a
symmetrical shape (a funnel shape) with respect to the central axis c of the speaker and the
frame 11 supporting the diaphragm 6A. Via a plurality of lead wires 9 for supplying a signal to
the voice coil 5 vibrating the diaphragm 6A, and a plurality of lead wires 9 disposed on the frame
11 for achieving symmetry with the plurality of lead wires 9 It is a speaker provided with a
dummy wire 12, and the plurality of lead wires 9 and the plurality of dummy wires 12 are
arranged at equal angular intervals (for example, 90 degrees) over the entire circumference of
the frame 11. And speakers.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the embodiment of
the present invention will be described below with reference to FIGS. 1 to 3 and FIGS. FIG. 1 is a
longitudinal sectional view of a loudspeaker according to a first embodiment of the present
invention and a front view thereof, FIG. 2 is a directivity characteristic diagram symmetrical to
the central axis of the loudspeaker, and FIG. FIGS. 10 to 13 are longitudinal sectional views of a
loudspeaker according to second to fifth embodiments of the present invention and a front view
thereof, respectively. The same components as those described above are denoted by the same
reference numerals, and the description thereof is omitted.
[0010]
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3
The speaker according to the present invention, as shown in FIGS. 1 and 10 to 13, includes a
yoke 1, a magnet 2, a plate 3, a bobbin 4, a drive coil (voice coil) 5 and cone paper (diaphragm)
provided with a center pole. 6A, an edge 7, a dust cap 8, a lead wire 9, an input terminal 10, a
frame 11, a dummy wire 12, mounting terminals 13 and 13A, and a suspension 14. In FIG. 1 and
FIGS. 10 to 13, when the lead wires 9 and the dummy wires 12 are shown by broken lines, it
indicates that the lead wires 9 and the dummy wires 12 exist on the back surface side of the
diaphragm 6A. On the other hand, when the lead wires 9 and the dummy wires 12 are shown by
solid lines, it indicates that the lead wires 9 and the dummy wires 12 exist on the surface side of
the diaphragm 6A.
[0011]
The speaker (FIG. 1) according to the first embodiment of the present invention is of a type
without the suspension 14 and has a configuration in which the lead wire 9 of the voice coil 5 is
directly connected to the input terminal 10.
[0012]
A speaker (FIG. 10) according to a second embodiment of the present invention is a type with a
suspension 14 and has a configuration in which the lead wire 9 of the voice coil 5 is directly
connected to the input terminal 10.
[0013]
The speaker (FIG. 11) according to the third embodiment of the present invention has a
configuration in which the lead wire 9 of the voice coil 5 is directly fixed to the suspension 14
and then connected to the input terminal 10.
[0014]
A speaker (FIG. 12) according to a fourth embodiment of the present invention is a type with a
suspension 14 and has the following configuration.
The lead wires 9 of the voice coil 5 are fixed by wiring so as to cover the surface from the inner
peripheral side to the outer periphery of the diaphragm 6A, and are connected to the mounting
terminals 13A on the diaphragm 6A.
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The mounting terminal 13A protrudes on the back surface of the diaphragm 6A, the mounting
terminal 13A on the back surface is connected to one end of another lead wire 9, and the other
end is connected to the input terminal 10.
Similarly, the dummy wire 12 is fixed so as to cover the surface from the inner peripheral side to
the outer periphery of the diaphragm 6A, and is connected to the mounting terminal 13A on the
diaphragm 6A. The mounting terminal 13A protrudes on the back surface of the diaphragm 6A,
the mounting terminal 13A on the back surface is connected to one end of another dummy wire
12, and the other end is connected to the mounting terminal 13.
[0015]
The speaker (FIG. 13) according to the fifth embodiment of the present invention is of a type with
a suspension 14, and after the lead wires 9 of the voice coil 5 are fixed so as to cover the back
surface of the diaphragm 6A, the input terminal 10 has a configuration to be connected.
[0016]
The diaphragm 6A described above is formed by resin molding using an injection method in
which a resin is injected from the top as described later, whereby uniformity of the shape of the
diaphragm is maintained.
That is, as shown in FIGS. 1 and 10 to 13, it is possible to obtain the diaphragm 6 resin-molded in
a funnel shape symmetrical to the central axis c of the speaker.
[0017]
The dummy wire 12 described above is a lead wire of the same size and the same material as the
lead wire 9 but does not transmit a signal. The dummy wire 12 is for symmetry with the lead
wire 9 disposed. The dummy wire 12 is attached to the attachment terminal 13 of the frame 11.
Thus, the lead wires 9, 9 and the dummy wires 12, 12 are arranged at equal angle (90 degrees)
intervals over the entire circumference of the frame 11.
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[0018]
The speaker according to the present invention provided with the diaphragm 6A having a
symmetrical shape with respect to the central axis c of the above-mentioned speaker has
symmetrical directivity with respect to the central axis c of the speaker, as shown in FIG. That is,
the directivity characteristics f, g, h shown in FIG. 2 are symmetrical with respect to the central
axis c. Here, the characteristics f to g are directivity characteristics of the speaker when the test
signals of 8, 9, and 10 kHz are reproduced by the speaker using the diaphragm 6A.
[0019]
By the way, as described above, since the conventional diaphragm 6 has an inherent asymmetric
property according to the manufacturing method, the directivity characteristic symmetrical with
respect to the central axis c of the speaker is made no matter how precisely it is made Can not be
obtained. On the other hand, the diaphragm 6A of the present invention is formed by resin
molding using an injection method in which a resin is injected from the top. This maintains the
uniformity (symmetry) of the shape of the diaphragm.
[0020]
In order to resin-mold the diaphragm 6A described above using the injection method, the
following steps (1) to (3) are mainly performed. (1) Attach the molds AA and BB, which are male
and female molds having equal diameters and uniform thickness in the circumferential direction,
to a molding machine (not shown), butt the two together, and then resin from injection hole CC
inject. The mold BB is provided with a top B1. Thereafter, the molds AA and BB are cooled to
harden the injected resin (FIG. 3A). (2) The body 6A2 of the diaphragm 6A is taken out of the
molding machine, and the top 6A1 and the unnecessary portions 6A2a and 6A2b are cut and
removed. (3) Thus, it is possible to obtain the diaphragm 6A resin-molded in a funnel shape
symmetrical to the central axis c of the speaker.
[0021]
On the other hand, as described above, since the pair of lead wires 9, 9 are arranged in one
direction on the diaphragm 6, even if the diaphragm 6A described above is used, the lead wire 9
is drawn in the vertical direction. There is a big difference in its directivity characteristics
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between the above and the one taken out in the horizontal direction (lateral direction).
[0022]
In a normal speaker, the attachment direction for attaching the pair of lead wires 9 and 9 on the
diaphragm 6 is managed in a constant manner, and in most cases, in the vertical direction (that
is, the lower dummy wire 12 shown in FIG. Since it is oriented in the mounting direction, no
problem occurs in the symmetry in the horizontal direction (i.e., the mounting direction of the
lead wire 9 shown in FIG. 1) by the pair of lead wires 9, 9.
However, since the radiation area is narrowed and the directivity in the vertical direction is
asymmetric, the atmosphere feeling such as the spread of sound is greatly affected.
[0023]
In order to solve the problem, in addition to the lead wire 9 added for applying the electric signal,
a dummy wire 12 which is a dummy lead wire is disposed for the purpose of balancing, and the
vertical direction with respect to the central axis of the speaker and Ensure horizontal symmetry.
The larger the number of dummy lines 12, the better. However, it is necessary to prevent the
weight of the vibration system of the speaker from increasing and preventing movement in the
central axis direction. In the embodiment of the present invention shown in FIG. 1, four wires 9
and 12 are arranged at 90 degree intervals in the radial direction, and two lead wires 9 and 9 are
used for applying an electrical signal, The symmetry is ensured by using two dummy lines 12,
12.
[0024]
Further, although not described in detail here, the dust cap 8 described above may be resinmolded using an injection method similar to that of the diaphragm 6A described above.
[0025]
As described above in detail, the present invention comprises a diaphragm having a shape
symmetrical to the central axis of the speaker, and a plurality of lead wires and a plurality of
leads all around the frame supporting the diaphragm. By arranging the dummy lines at equal
angular intervals, it is possible to produce a speaker having directional characteristics
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symmetrical with respect to the central axis of the speaker, and special adjustment only by using
a plurality of such speakers alone for stereo reproduction. Alternatively, it is possible to provide a
speaker capable of obtaining sound field localization with a good sense of reality.
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