JP2001211490A - Speaker system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a speaker system which reduces noise generated by a speaker caused by a magnetic flux passing though the coil of a network when no signal is outputted. SOLUTION: This speaker system is provided with a plurality of speaker units, a cabinet on which the plurality of speaker units are mounted and a network which is electrically connected to the plurality of speaker units and has a coil for distributing an electric signal to the plurality of speaker units in each frequency band. The speaker is provided with a coil position moving means which moves the position of the coil of the network by relatively moving the network with respect to the cabinet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker system for outputting signals distributed for each frequency band by a network to a plurality of speaker units.

[0002]

2. Description of the Related Art Conventionally, a loudspeaker system is composed of a plurality of loudspeaker units, and each loudspeaker unit divides the frequency band into low, middle, and high frequency bands and outputs as a sound signal. Speaker systems are widely used. This is because reproduction is performed for each frequency band using a plurality of speaker units, so that the reproduction frequency band can be widened. Networks are used to divide electrical signals into multiple speaker units for each frequency band. The network is a substrate on which a resistor, a capacitor, a coil, and the like are mounted, and the resistor, the capacitor, the coil, and the like form a low-pass filter, a high-pass filter, and the like. The high pass filter is connected to the tweeter and the low pass filter is connected to the woofer. In a conventional speaker system, the network is fixed to a cabinet.

[0003]

However, in such a loudspeaker system, a current is generated in a coil of a network by a magnetic flux or a terrestrial magnetism generated from a cathode ray tube of a television receiver. Further, when no electric signal is input from the amplifier unit to the network, 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 section, noise is generated from the speaker (tweeter) due to the current generated in the coil. In other words, when not using the speaker system,
There is a problem that noise is generated from the speaker system. 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 a desired installation position in order to reduce the magnetic flux passing through the coil of the network. Must.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a speaker system having a network which is not affected by magnetic flux from a television receiver or geomagnetism. To provide a speaker system.

[0005]

According to the present invention, there is provided a speaker system comprising: 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. The network includes a network having a coil for distributing an electric signal for each frequency band, and coil position moving means for moving the position of the coil of the network by moving the network relative to the cabinet.

In a preferred embodiment, the coil position moving means is a network rotating means for moving the position of a coil of the network by rotating the network.

In a preferred embodiment, the network rotation means has a network rotation prevention means for preventing the network from continuing to rotate.

Hereinafter, the operation of the speaker system according to the present invention will be described. The speaker system according to the present invention includes a coil position moving unit. 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 rotating means for moving the position of the coil of the network by rotating the network is used. Magnetic flux generated from a cathode ray tube or the like of a television receiver generates current in a coil included in the network, and noise is generated from a speaker even when there is no signal. However, by moving the network relative to the cabinet and changing the position of the coils in the network, the magnitude of the magnetic flux passing through the coils changes. When 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. In other words, by moving the network relative to the cabinet, the magnitude of the magnetic flux passing through the coil of the network can be minimized, and as a result, the coil of the network is located at a position where the noise generated from the speaker is minimized. Can be set. In this way, noise generated from the speaker when there is no signal can be reduced without moving the speaker from a state where the speaker is installed at a desired position.

Preferably, the network rotation means includes a network rotation prevention means. The network rotation preventing means prevents the network from rotating more than a predetermined angle, and prevents the disconnection of the cable due to the rotation of the network more than the predetermined angle.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 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.

FIG. 1 is a schematic sectional view showing a speaker system according to a preferred embodiment of the present invention. In the present embodiment, a case where the speaker system 1 includes two speaker units will be described as a representative example. 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 the two speaker units.

The speaker unit 2 is a tweeter (a speaker dedicated to high frequencies). Therefore, the speaker unit 2
, The high frequency component of the electric signal from the amplifier is transmitted. The speaker unit 3 is a woofer (a low-range dedicated speaker). Therefore, the speaker unit 3 includes
A low-frequency component of the electric signal from the amplifier is transmitted. The speaker unit 2 and the speaker unit 3 reproduce the entire frequency band of the electric signal from the amplifier.

The speaker units 2 and 3 are mounted on a cabinet 4. The cabinet 4 may be a commonly used cabinet. A screw insertion port 6 is defined in the cabinet 4 so that a screw 16 described later can be inserted.

The speaker units 2 and 3 are electrically connected to a network 5. Network 5
This circuit is composed of a coil, a capacitor, and the like, and is provided for distributing an electric signal from the amplifier for each frequency band reproduced by the speaker units 2 and 3.

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 a low-frequency component of the electric signal from the amplifier and passes a high-frequency component. The low-pass filter 8 blocks high-frequency components of the electric signal from the amplifier and passes low-frequency components.

The high-pass filter 7 is connected to the speaker unit 2 which is a tweeter. The high-pass filter 7 may be arbitrarily appropriate according to the frequency band of the electric signal 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 with the tweeter. When there is no signal, a closed circuit is formed by the coil L1 and the tweeter.

The low-pass filter 8 is connected to the speaker unit 3 which is a woofer. As the low-pass filter 7, any suitable low-pass filter can be adopted according to the frequency band of the electric signal 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 with the woofer.

The speaker system 1 further includes a coil position moving means 9. The coil position moving means 9 moves the coil 5 in the network by moving the network 5 relative to the cabinet 4.

The coil position moving means 9 typically includes
Network turning means 10 is used. The network turning means 10 is provided for turning the network 5 to a desired angle. Network rotating means 10
By rotating the network 5, the positions of the coils L1 and L2 of the network 5 (the high-pass filter 7 and the low-pass filter 8) can be changed.

The network pivoting means 10 is mounted on any suitable part of the cabinet 4. Typically,
The network turning means 10 is attached to the rear of the cabinet.

The network rotating means 10 includes a network support 11 and a network rotating shaft 12. The network rotation axis 12 is connected to the network support 1.
1 is attached. Typically, the network rotation shaft 12 is attached to the center of the network support 11 so as to be orthogonal to the network support 11.

A spacer 13 is provided on the network support 11.
The network 5 is attached via the like. The spacer 13 is used to prevent the network from being damaged when the network 5 is attached to the network support 11. The attachment of the network 5 to the network support 11 is performed by using a screw 1 described later on the network 5.
This is because it is difficult to define the screw insertion port for mounting the sixth screw. Therefore, the screw insertion port 14 is defined so that a screw 16 described later can be inserted into the network support 11.

Typically, the coil L1 of the high-pass filter 7 is such that the axis of the coil L1 is
There is a positional relationship forming an angle of 0 degrees.

The network support 11 has a packing 15
It has. Any suitable packing 15 can be adopted. Typically, 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).

The network rotation shaft 12 is composed of, for example, screws 16, nuts 17, 18 and 19. Screws 16 are inserted into screw insertion ports 6 and 14 defined in cabinet 4 and network support 11. The screws 16 inserted into the screw insertion ports 6 and 14 are fixed from both sides of the network support 11 by nuts 17 and 18. In this way, the network pivot 12 is fixed to the network support 11 on which the network 5 is mounted. 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 back 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 nut 19, the network support 11 comes into close contact with the inner wall of the cabinet 4 via the packing 15. Therefore, the airtightness in the cabinet is maintained.

In a preferred embodiment, the network rotation means 10 further includes a network rotation prevention means 20. The network rotation preventing means 20 is provided to restrict the network 5 from rotating beyond a predetermined angle. This is because the speaker unit, the network 5 and the amplifier are electrically connected by a cable (not shown) or the like, so that if the network 5 continues to rotate, the cable may be entangled and cut. By providing the network rotation preventing means 20, the disconnection of the cable is favorably prevented.

The network rotation preventing means 20 is typically formed such that the network 5 cannot rotate more than 180 degrees in both clockwise and counterclockwise directions. Since the network 5 can rotate clockwise and counterclockwise within 180 degrees, respectively,
The coil of the network 5 can be adjusted to any position, and furthermore, one clockwise and one counterclockwise, respectively.
Since the rotation is not possible beyond 80 degrees, the problem that the cable is cut is solved. The network rotation preventing means 20 includes, for example, a protrusion provided on the screw 16 and a protrusion provided on the cabinet 4. The collision of the two lobes at a predetermined angle causes the network to rotate clockwise and counterclockwise by 180 °, respectively.
It is possible to prevent the rotation of more than degrees.

Next, a method for adjusting the angle of the network in the speaker system of the present invention will be described.

FIG. 3 shows the network rotating means 10 of FIG.
FIG. (A) is a network rotating means 1
0 indicates a state in which the network rotation means 10 is fixed so as not to rotate, and FIG.

In the state shown in FIG. 3A, by loosening the nut 19 that fixes the network rotation shaft 12, the state in which the network support 11 is in close contact with the inner wall of the cabinet is released. Is in the state shown in FIG. In this state, the packing 15 provided on the network support 11 is
Are in close contact with the inner wall of the cabinet 4. Therefore, even when the nut 19 is loosened, the airtightness in the cabinet 4 is maintained very well. That is, FIG.
In the state (b), the network 5 can be rotated while maintaining the airtightness in the cabinet 4. By rotating the network rotation shaft 12 to a predetermined angle, the network support 11 also rotates to the same angle. Therefore, the network 5 attached to the network support 11 also rotates, and the positions of the coils L1 and L2 of the network 5 change.

An electric current is generated in the coil of the network 5 by a magnetic flux or a terrestrial magnetism from the cathode ray tube of the television receiver. Speaker unit 2 that is a tweeter
And in the high-pass filter 7, when there is no signal,
A closed circuit is formed by the coil L1 and the tweeter. Therefore, particularly in the tweeter, even when the audio signal is not input to the network 5 from the amplifier, the audio is reproduced from the tweeter by the current generated by the magnetic flux passing through the coil L1. Coil L of network 5
Since the magnetic flux passing through 1 has directivity, by rotating the network 5 and changing the position of the coil L1, the magnitude of the magnetic flux passing through the coil L1 can be reduced. Therefore, the current generated in the coil of the network 5 can be reduced, and the noise (noise) from the speaker unit, particularly the tweeter, when there is no signal can be extremely reduced.

The network rotation shaft 12 is rotated to an angle at which the magnitude of the magnetic flux passing through the coil of the network 5 becomes the smallest. At an angle at which the magnitude of the magnetic flux passing through the coil of the network 5 becomes the smallest, the noise reproduced from the speaker unit when there is no signal can be reduced most.

The angle of the network 5 at which the noise from the speaker unit when there is no signal can be reduced most depends on the environment in which the speaker system 1 is installed. Therefore, the user of the speaker system may arbitrarily change the network 5 to an appropriate angle according to the environment in which the speaker system is used.

In this embodiment, the high-pass filter and the low-pass filter are formed on a common substrate and are rotated by common network rotating means. Each may be formed on a separate substrate, and each may be provided with a network rotating means. In this case, the network turning means may be provided only on the tweeter which generates noise especially when there is no signal.

In this embodiment, the network rotating means for rotating the network is used as the coil position moving means. However, the present invention is not limited to these configurations, and the network is moved relatively to the cabinet. Accordingly, any coil position moving means for moving the position of the coil can be employed. For example, the position of the coil may be moved by moving the network parallel 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.

The speaker system according to the present invention is installed above a television receiver. The network of the speaker system is rotated by the network rotating means, and the coil of the high-pass filter is set at an angle to be horizontal and an angle to be vertical with respect to the top surface of the CRT of the television receiver. FIG. 4 is a schematic diagram showing the positions of the coils of the high-pass filter when the speaker system of the present invention is installed above the television receiver. (A) shows a state in which the winding direction of the coil is set to be horizontal with respect to the television receiver. (B) shows a state in which the winding direction of the coil is set to be perpendicular to the television receiver. A measuring instrument is connected instead of a tweeter at both ends of the coil of the high-pass filter (between terminals connecting the tweeter), and a load (resistance 8) is provided at both ends of the capacitor of the low-pass filter (terminal connecting the woofer) instead of the woofer. Ohm)
Connect. The measuring instrument uses an oscilloscope (voltage waveform measuring instrument). The input side (terminal to which the amplifier is connected) of the high-pass filter and the low-pass filter is opened to make no signal.

In the state shown in FIG. 4A, when the signal from the amplifier is in a no-signal state, the voltage across the coil of the high-pass filter (between both terminals connecting the tweeter) is measured using a measuring instrument (oscilloscope). It was measured. Figure 5 shows the measurement results.
(A). The voltage was measured similarly in the state shown in FIG. The measurement results are shown in FIG. FIG.
In (a) and (b), the horizontal axis is time (unit: second),
The vertical axis indicates voltage (unit: volt).

As apparent from FIG. 5 (a), when the coil of the network is set to be horizontal with respect to the television receiver, the noise generated from the tweeter when there is no signal has a maximum of approximately 0.04 volts. It can be seen that it is.
As is clear from FIG. 5B, when the coil of the network is set to be perpendicular to the television receiver, the noise generated from the tweeter when there is no signal is approximately 0.008 volt at the maximum. I understand. As is clear from the above, even when the speaker system is installed under the same condition, the noise generated from the tweeter when there is no signal can be reduced from 0.04 volt to 0.008 volt 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, and the position of the coil of the network can be moved. By moving the position of the coil of the network, 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 can be changed. Therefore, the noise generated from the speaker unit when the speaker system is not used can be reduced by moving the network relative to the cabinet.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a speaker system according to a preferred embodiment of the present invention.

FIG. 2 is a circuit diagram showing a typical network used in the speaker system of the present invention.

FIG. 3A is a cross-sectional view showing a state in which the network turning means of the speaker system of the present invention is fixed so as not to turn, and FIG. 3B is a cross-sectional view showing a turnable state. It is.

FIG. 4 is a sectional view showing positions of coils of a high-pass filter when the speaker system of the present invention is installed above a television receiver. (A) shows a state where the coil is set horizontally with respect to the television receiver. (B) shows a state where the coil is set perpendicular to the television receiver.

5 (a) and 5 (b) are graphs respectively showing voltages generated across the coil of the high-pass filter when there is no signal in the states of FIGS. 4 (a) and 4 (b).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Speaker system 2, 3 Speaker unit 4 Cabinet 5 Network 9 Coil position moving means 10 Network rotating means 11 Network support 12 Network rotating shaft 20 Network rotating preventing means

Claims (3)

[Claims] A plurality of speaker units, a cabinet for mounting the plurality of speaker units, and a coil electrically connected to the plurality of speaker units and distributing electric signals to the plurality of speaker units for each frequency band. And a coil position moving means for moving the position of the coil of the network by moving the network relative to the cabinet,
Speaker system. 2. The speaker system according to claim 1, wherein said coil position moving means is a network rotating means for moving the position of a coil of said network by rotating said network. 3. The speaker system according to claim 2, wherein said network rotation means has network rotation prevention means for preventing said network from continuing to rotate.