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JP2001211490

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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
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2001211490
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker system which outputs signals distributed in each frequency band by a network at a
plurality of speaker units.
[0002]
2. Description of the Related Art Conventionally, in a speaker system, a multi-way is composed of
a plurality of speaker units, and each speaker unit is divided into frequency bands such as low
band, middle band, high band and the like and output as an audio signal. Speaker systems are
widely used. Since reproduction is performed for each frequency band using a plurality of
speaker units, the reproduction frequency band can be broadened. A network is used to split the
electrical signal into multiple speaker units per frequency band. The network is a substrate to
which a resistor, a capacitor, a coil and the like are attached, and a low pass filter, a high pass
filter and the like are formed by the resistor, the capacitor, the coil and the like. A high pass filter
is connected to the tweeter and a low pass filter is connected to the woofer. In conventional
loudspeaker systems, the network is secured to the cabinet.
[0003]
However, in such a speaker system, current is generated in the coil of the network due to
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magnetic flux or geomagnetism generated from the cathode ray tube of the television receiver.
Furthermore, when no electric signal is input to the network from the amplifier unit, a closed
circuit is formed by the coil of the high pass filter and the tweeter. Therefore, even when an
electric signal is not input from the amplifier unit, noise is generated from the speaker (tweeter)
by the current generated in the coil. That is, there is a problem that noise is generated from the
speaker system when the speaker system is not used. As a result, according to the conventional
speaker system, in order to reduce the current generated in the coil of the network when there is
no signal, the speaker must be moved from the desired installation position in order to reduce
the magnetic flux passing through the coil of the network. You must.
[0004]
The present invention has been made to solve the above-described conventional problems, and
the object of the present invention is to provide a speaker system that is not affected by magnetic
flux or geomagnetism from a television receiver in a speaker system including a network. It is to
provide.
[0005]
A speaker system according to the present invention comprises a plurality of speaker units, a
cabinet for mounting the plurality of speaker units, and a plurality of speaker units electrically
connected to the plurality of speaker units. And a coil position moving means for moving the
position of the coil of the network by moving the network relative to the cabinet.
[0006]
In a preferred embodiment, the coil position moving means is a network turning means for
moving the position of the coil of the network by turning the network.
[0007]
In a preferred embodiment, the network rotation means comprises network rotation prevention
means for preventing the network from continuing to rotate.
[0008]
Hereinafter, the operation of the speaker system in the present invention will be described.
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The speaker system in the present invention comprises coil position moving means.
A network is attached to the coil position moving means, and the position of the coil of the
network is moved by moving the network relative to the cabinet using the coil position moving
means.
As the coil position moving means, for example, a network turning means for moving the position
of the coil of the network by turning the network is used.
A magnetic flux generated from a cathode ray tube or the like of a television receiver generates a
current in a coil of the network, and noise is generated from the speaker even when no signal is
present. However, by moving the network relative to the cabinet and changing the position of the
coils of the network, the magnitude of the magnetic flux passing through the coils changes. As
the magnitude of the magnetic flux passing through the coil changes, the magnitude of the noise
reproduced from the speaker when there is no signal also changes. That is, by moving the
network relative to the cabinet, it is possible to minimize the magnitude of the magnetic flux
passing through the coils of the network, so that the coil of the network is at a position where the
noise generated by the speakers is minimized. Can be set. In this way, it is possible to reduce the
noise generated from the speaker when there is no signal, without moving the speaker from the
state of being placed at the desired position.
[0009]
Preferably, the network pivoting means comprises network pivoting prevention means. The
network rotation preventing means can prevent the network from rotating more than a
predetermined angle, and can prevent the cable from being cut by the rotation more than the
predetermined angle of the network.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present
invention will be specifically described below with reference to FIGS. 1 to 5, but the present
invention is not limited to these embodiments.
[0011]
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FIG. 1 is a schematic cross-sectional view showing a speaker system according to a preferred
embodiment of the present invention.
In the present embodiment, as a representative example, the case where the speaker system 1
includes two speaker units will be described. The speaker system 1 includes speaker units 2 and
3, a cabinet 4, and a network 5. Therefore, the audio signal from the amplifier unit (not shown) is
distributed for each frequency band and reproduced by two speaker units.
[0012]
The speaker unit 2 is a tweeter (high-range dedicated speaker). Therefore, the high frequency
component of the electric signal from the amplifier is transmitted to the speaker unit 2. The
speaker unit 3 is a woofer (low frequency dedicated speaker). Therefore, the low frequency
component of the electric signal from the amplifier is transmitted to the speaker unit 3. The
speaker unit 2 and the speaker unit 3 reproduce the entire frequency band of the electric signal
from the amplifier.
[0013]
The speaker units 2 and 3 are attached to the cabinet 4. A commonly used cabinet may be
employed as the cabinet 4. In the cabinet 4, a screw insertion port 6 is defined so that a screw 16
described later can be inserted.
[0014]
The speaker units 2 and 3 are electrically connected to the network 5. The network 5 is a circuit
composed of a coil, a capacitor and the like, and is provided to distribute the electric signal from
the amplifier for each frequency band reproduced by the speaker units 2 and 3.
[0015]
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FIG. 2 is a circuit diagram showing a typical network used in the speaker system of the present
invention. The network 5 includes a high pass filter 7 and a low pass filter 8. The high pass filter
7 blocks low frequency components of the electric signal from the amplifier and passes high
frequency components. The low pass filter 8 blocks the high frequency component of the electric
signal from the amplifier and passes the low frequency component.
[0016]
The high pass filter 7 is connected to the speaker unit 2 which is a tweeter. The high pass filter 7
may be arbitrarily selected according to the frequency band of the electric signal to be
transmitted to the tweeter. Typically, the high pass filter 7 has a capacitor C1 in series with the
tweeter and a coil L1 in parallel. In addition, when there is no signal, a closed circuit is formed by
the coil L1 and the tweeter.
[0017]
The low pass filter 8 is connected to the speaker unit 3 which is a woofer. The low pass filter 7
may be arbitrarily selected according to the frequency band of the electrical signal to be
transmitted to the woofer. Typically, the low pass filter 8 has a coil L2 in series with the woofer
and a capacitor C2 in parallel.
[0018]
The speaker system 1 further includes a coil position moving means 9. The coil position moving
means 9 moves the position of the coil in the network by moving the network 5 relative to the
cabinet 4.
[0019]
As the coil position moving means 9, typically, a network turning means 10 is used. A network
pivoting means 10 is provided to pivot the network 5 to the desired angle. By rotating the
network 5 by the network rotation means 10, the positions of the coils L1 and L2 of the network
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5 (the high pass filter 7 and the low pass filter 8) can be changed.
[0020]
The network pivoting means 10 is attached to any suitable part of the cabinet 4. Typically, the
network pivoting means 10 is mounted at the rear of the cabinet.
[0021]
The network pivoting means 10 comprises a network support 11 and a network pivot 12. The
network pivot 12 is attached to the network support 11. Typically, the network pivot 12 is
mounted at the center of the network support 11 so as to be orthogonal to the network support
11.
[0022]
The network 5 is attached to the network support 11 via the spacer 13 and the like. The spacer
13 is used to prevent the network breakage that occurs when attaching the network 5 to the
network support 11. The reason why the network 5 is attached to the network support 11 is that
it is difficult to define a screw slot for attaching a screw 16 described later to the network 5.
Therefore, a screw insertion port 14 is defined in the network support 11 so that a screw 16
described later can be inserted.
[0023]
Typically, coil L1 of high-pass filter 7 is in a positional relationship in which the axis of coil L1
forms an angle of 90 degrees with network rotation axis 12.
[0024]
The network support 11 is provided with a packing 15.
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The packing 15 may be arbitrarily selected. Typically, a rubber packing is used. By providing the
packing 15 on the network support 11, the airtightness in the cabinet can be maintained
extremely well (details will be described later).
[0025]
The network rotation shaft 12 is composed of, for example, a screw 16, nuts 17, 18 and 19. The
screws 16 are inserted into screw inserts 6 and 14 defined in the cabinet 4 and the network
support 11. The screws 16 inserted into the screw insertion holes 6 and 14 are fixed from both
sides of the network support 11 by the nuts 17 and 18. Thus, the network pivot 12 is fixed to the
network support 11 to which the network 5 is attached. Therefore, the network 5 can be rotated
by rotating the network rotation shaft 12. Furthermore, the network support 11 and the network
rotation shaft 12 can be fixed to the cabinet 4 by tightening the nut 19 from the rear side of the
cabinet 4 of the network rotation shaft 12. By fixing the network support 11 and the network
rotation shaft 12 to the cabinet 4 with the nuts 19, the network support 11 is in close contact
with the inner wall of the cabinet 4 via the packing 15. Therefore, the airtightness in the cabinet
is maintained.
[0026]
In a preferred embodiment, the network rotation means 10 further comprises a network rotation
prevention means 20. The network rotation preventing means 20 is provided to restrict the
network 5 not to rotate more than a predetermined angle. Since the speaker unit, the network 5
and the amplifier are electrically connected by a cable (not shown) or the like, if the network 5
continues to rotate, the cable may be entangled and cut. By providing the network rotation
prevention means 20, cutting of the cable can be well prevented.
[0027]
The network rotation preventing means 20 is typically formed so that the network 5 can not
rotate more than 180 degrees in both clockwise and counterclockwise directions. The coil of the
network 5 can be adjusted to an arbitrary position because the network 5 can be rotated within
180 degrees clockwise and counterclockwise, respectively, and further, it can be 180 degrees or
more each clockwise and counterclockwise. Is not pivotable, the problem of cable breakage is
eliminated. The network rotation preventing means 20 is constituted of, for example, a convex
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portion provided on the screw 16 and a convex portion provided on the cabinet 4. The collision
of the two projections at a predetermined angle can prevent the network from rotating clockwise
and counterclockwise by 180 degrees or more.
[0028]
Next, a method of adjusting the angle of the network in the speaker system of the present
invention will be described.
[0029]
FIG. 3 is an enlarged view of the network pivoting means 10 of FIG.
(A) shows a state in which the network rotation means 10 is fixed so as not to be rotatable, and
(b) shows a state in which the network rotation means 10 is rotatable.
[0030]
In the state shown in FIG. 3A, by loosening the nut 19 fixing the network rotation shaft 12, the
close contact with the inner wall of the cabinet of the network support 11 is released, and the
network rotation shaft 12 is rotated. It will be in the state of FIG.3 (b) which is possible. In this
state, the packing 15 provided on the network support 11 is in close contact with the inner wall
of the cabinet 4. Therefore, even in the state where the nut 19 is loosened, the airtightness in the
cabinet 4 is extremely well maintained. That is, in the state shown in FIG. 3B, the network 5 can
be rotated while maintaining the airtightness in the cabinet 4. By rotating the network rotation
shaft 12 at a predetermined angle, the network support 11 also rotates at the same angle.
Therefore, the network 5 attached to the network support 11 is also rotated, and the positions of
the coils L1 and L2 of the network 5 are changed.
[0031]
A current is generated in the coil of the network 5 due to magnetic flux or geomagnetism from
the cathode ray tube of the television receiver. In the speaker unit 2 and the high pass filter 7
which are tweeters, when there is no signal, a closed circuit is formed by the coil L1 and the
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tweeter. Therefore, particularly in the tweeter, even when the audio signal from the amplifier is
not input to the network 5, the tweeter reproduces the sound by the current generated by the
magnetic flux passing through the coil L1. Since the magnetic flux passing through the coil L1 of
the network 5 has directivity, the magnitude of the magnetic flux passing through the coil L1 can
be reduced by rotating the network 5 and changing the position of the coil L1. it can. Therefore,
the current generated in the coil of the network 5 can be reduced, and the noise (noise) from the
speaker unit, in particular, the tweeter when there is no signal can be extremely reduced.
[0032]
The network pivot shaft 12 is pivoted to an angle at which the magnitude of the magnetic flux
passing through the coils of the network 5 is minimized. At the angle at which the magnitude of
the magnetic flux passing through the coil of the network 5 is the smallest, the noise reproduced
from the speaker unit in the absence of a signal can be most reduced.
[0033]
The angle of the network 5 that can most reduce the noise from the speaker unit at the time of
no signal varies depending on the environment in which the speaker system 1 is installed.
Therefore, the user of the speaker system may change the network 5 to an appropriate angle
according to the environment in which the speaker system is used.
[0034]
In the present embodiment, the high pass filter and the low pass filter are formed by a common
substrate, and are rotated by a common network rotation means, but the high pass filter and the
low pass filter are respectively individual It may be formed of a substrate and each may be
provided with a network pivoting means. In this case, the network pivoting means may be
provided only to the tweeter that generates noise particularly when there is no signal.
[0035]
In the present embodiment, although the network rotation means for rotating the network is
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used as the coil position movement means, the present invention is not limited to these
configurations, and the coil can be moved by moving the network relative to the cabinet. Any coil
position moving means for moving the position of may be employed. For example, the position of
the coil may be moved by translating the network relative to the cabinet.
[0036]
EXAMPLES Examples of the present invention will be specifically described below, but the
present invention is not limited to these examples.
[0037]
The loudspeaker system of the invention is placed on top of the television receiver.
The network of the speaker system is rotated by the network rotation means, and the high-pass
filter coil is set to an angle at which the coil is horizontal and perpendicular to the top surface of
the television receiver. FIG. 4 is a schematic view showing the position of the coil of the high pass
filter when the speaker system of the present invention is installed on the top of the television
receiver. (A) shows a state in which the winding axis direction of the coil is set to be horizontal to
the television receiver. (B) shows a state in which the winding axis direction of the coil is set to be
perpendicular to the television receiver. Instead of the tweeter, connect the measuring
instrument to both ends of the high pass filter coil (between the terminals to which the tweeter is
connected), and load both ends of the capacitor of the low pass filter (the terminal to connect the
woofer) instead of the woofer Connect the ohms). The measuring instrument uses an oscilloscope
(voltage waveform measuring instrument). The high-pass filter and the low-pass filter input side
(terminal to which the amplifier is connected) are opened to be in a non-signal state.
[0038]
In the state shown in FIG. 4A, with no signal from the amplifier, the voltage at both ends of the
coil of the high pass filter (between the two terminals connecting the tweeter) was measured
using a measuring instrument (oscilloscope). The measurement results are shown in FIG. 5 (a).
The voltage was similarly measured in the state shown in FIG. The measurement results are
shown in FIG. 5 (b). In FIGS. 5A and 5B, the horizontal axis represents time (unit: second) and the
vertical axis represents voltage (unit: volt).
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[0039]
As apparent from FIG. 5 (a), when the coil of the network is set to be horizontal to the television
receiver, the noise generated from the tweeter at the time of no signal is up to about 0.04 volts. I
understand. As apparent from FIG. 5 (b), when the coil of the network is set to be perpendicular
to the television receiver, the noise generated from the tweeter at the time of no signal is up to
approximately 0.008 volts. I understand. As is apparent from the above, even when the speaker
system is installed under the same conditions, the noise generated from the tweeter in the
absence of a signal is 0.04 to 0.008 volts by changing the position of the coil of the network. Can
be extremely reduced.
[0040]
According to the speaker system of the present invention, by providing the coil position moving
means, the network can be moved relative to the cabinet to move the position of the coil of the
network. By moving the position of the coil of the network, it is possible to change the magnitude
of the magnetic flux generated from the cathode ray tube or the like of the television receiver
and passing through the coil of the network. Therefore, noise generated from the speaker unit
when the speaker system is not used can be reduced by moving the network relative to the
cabinet.
[0041]
Brief description of the drawings
[0042]
1 is a schematic cross-sectional view showing a speaker system according to a preferred
embodiment of the present invention.
[0043]
2 is a circuit diagram showing a representative network used in the speaker system of the
present invention.
[0044]
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Fig.3 (a) is sectional drawing which shows the state to which the network rotation means of the
speaker system of this invention was fixed so that rotation is impossible, and (b) is sectional
drawing which shows the state which can be rotated. .
[0045]
4 is a cross-sectional view showing the position of the coil of the high pass filter when the
speaker system of the present invention is installed on the top of the television receiver.
(A) shows a state where the coil is set horizontally to the television receiver.
(B) shows a state in which the coil is set perpendicular to the television receiver.
[0046]
FIGS. 5A and 5B are graphs showing voltages generated at both ends of the coil of the high pass
filter in the absence of signals in the states of FIGS. 4A and 4B, respectively.
[0047]
Explanation of sign
[0048]
DESCRIPTION OF SYMBOLS 1 Speaker system 2, 3 Speaker unit 4 Cabinet 5 Network 9 Coil
position moving means 10 Network rotation means 11 Network support 12 Network rotation
axis 20 Network rotation prevention means
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