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JP2003299182

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DESCRIPTION JP2003299182
[0001]
TECHNICAL FIELD The present invention relates to a speaker network device for connecting an
amplifier and a speaker.
[0002]
2. Description of the Related Art In general, when a speaker system is configured by combining a
plurality of speakers having different reproduced sound bands, an audio signal from an amplifier
serving as an external sound source is divided into a plurality of bands by a speaker network
device and used for each band. Input to the speaker of. The speaker network device is formed by
forming a network circuit including a band pass filter on a substrate provided with an amplifier
and a connection terminal to the speaker. In the case of in-vehicle use, a substrate on which a
network circuit is formed (hereinafter referred to as a network substrate). Is often used in a unit
type speaker network device in which the An example is shown in FIG.
[0003]
The speaker network device shown in FIG. 7 is formed by housing the network substrate 14 in a
housing 25. At one end of the device, a plurality of terminals 31a, 31b, 32a, 32b, 33a, 33b
connected in parallel to the network circuit on the network substrate 14 are arranged in parallel,
and the respective terminals 31a, 31b, 32a, 32b, 33a, 33b The cable is to be connected.
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Terminals 31a and 31b are input terminals to which an amplifier is connected, terminals 32a and
32b are output terminals to which a low range speaker is connected, and terminals 33a and 33b
are output terminals to which a high range speaker is connected .
[0004]
FIGS. 8A and 8B show the structure adopted for the terminals 31a, 31b, 32a, 32b, 33a, 33b of
the conventional speaker network device. As shown in FIG. 8A, each of the terminals 31a, 31b,
32a, 32b, 33a, 33b includes a terminal member 34 fixed to the network substrate 14, a screw 35
screwed to the terminal member 34, and a terminal member It is comprised by the pinching plate
36 provided between 34 and the head part 35a of the screw 35. As shown in FIG. The terminal
member 34 is inserted into the through hole 14 a of the network substrate 14, and soldered with
solder 28 to the printed wiring 37 of the network circuit formed on the lower surface of the
network substrate 14 as shown in FIG. It is done. Connection of the cable 10 to each terminal
31a, 31b, 32a, 32b, 33a, 33b is performed by inserting the conductor exposed portion of the tip
of the cable 10 between the terminal member 34 and the sandwiching plate 36 and tightening
the screw 35 Is done.
[0005]
FIG. 9 is a circuit diagram of a network circuit in a conventional speaker network device. In the
network circuit 37, a low pass filter 38 is formed between the input terminals 31a and 31b and
one of the output terminals 32a and 32b, and a high pass filter 39 is formed between the other
output terminals 33a and 33b. . Both filters 38 and 39 are analog filters including a coil L and a
capacitor C as circuit elements.
[0006]
As shown in FIG. 10, the amplifier 11 is connected to the input terminals 31a and 31b of the
network circuit 37, the speaker 8 for the low frequency band to one of the output terminals 32a
and 32b, and the high frequency band to the other output terminals 33a and 33b. By connecting
the speakers 9 via the cables 10 respectively, it is possible to configure a speaker system
provided with two speakers 8 and 9 different in reproduced sound band.
[0007]
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However, there is a degree of freedom in the form of use of the network circuit 37, and the
speakers 8, 9 are connected to both output terminals 32a, 32b and 33a, 33b as shown in FIG.
There are cases where the speaker 9 is connected to only one of the output terminals 33a and
33b as shown in FIG.
In the latter case, the closed circuit consisting of the capacitor C and the coil L on the side of the
output terminals 32a and 32b to which the speaker is not connected and the coil L and the
amplifier 11 operate as a resonant circuit, and the capacitor C is damaged by the excessive
current i generated by resonance. There is a possibility of
[0008]
Therefore, it is an object of the present invention to prevent damage to the capacitor by
preventing formation of a closed circuit that operates as a resonant circuit when the speaker is
not connected or in a state of shipping. An object of the present invention is to provide a speaker
network device capable of preventing or prolonging the service life.
[0009]
SUMMARY OF THE INVENTION In order to solve the above problems, the speaker network
device of the present invention has an input terminal to which a sound signal from an amplifier is
input, and a predetermined band of the sound signal input from the input terminal. A speaker
network device comprising an analog filter configured using a capacitor and a coil to pass only
components and an output terminal for outputting a sound signal passed through the analog
filter to a speaker, the speaker being connected to the output terminal When not present, the
closed circuit including the capacitor and the coil is not formed even if an external sound source
is connected to the input terminal.
[0010]
In the speaker network device according to another aspect of the invention, the input terminal to
which the sound signal from the amplifier is input, and the capacitor and the coil for passing only
a predetermined band component of the sound signal input from the input terminal are
configured. A speaker network device comprising an analog filter and an output terminal for
outputting a sound signal that has passed through the analog filter to a speaker, the capacitor
and the coil being connected even if an external sound source is connected to the input terminal
when the device is shipped. The closed circuit is not formed, and the closed circuit is formed only
when the speaker is connected.
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3
[0011]
Further, the output terminal is disposed such that one terminal member always connected to the
capacitor and the other terminal member always connected to the coil are separated from each
other, and when connecting the cable of the speaker, both ends of the conductive member are
connected. It is preferable to provide it as a bridge over the child member.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present
invention will be described below with reference to the drawings.
[0013]
The speaker network device of this embodiment includes the network substrate 14 in the
housing 25 (see FIG. 1), as in the conventional device shown in FIG.
However, the configuration of the network circuit formed on the network substrate 14 and the
structure of the output terminal are different from those of the conventional device.
The same members as those of the conventional device are denoted by the same reference
numerals, and the description thereof will be omitted or simplified.
[0014]
At one end of the device, a plurality of terminals 2a, 2b, 3a, 3b, 4a, 4b connected to the network
circuit on the network board 14 are arranged in parallel.
Here, the terminals 2a and 2b are input terminals to which the amplifier 11 is connected, the
terminals 3a and 3b are output terminals to which the low frequency range speaker 8 is
connected, and the terminals 4a and 4b are high frequency range speakers An output terminal 9
is connected.
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[0015]
FIG. 2 is a circuit diagram showing a configuration example of a network circuit in the speaker
network device of the present invention, and FIG. 3 is a circuit diagram in a state where an
amplifier and a speaker are connected by the network circuit.
The network circuit 1 formed on the network substrate 14 includes a pair of input terminals 2a
and 2b to which an amplifier 11 serving as an external sound source is connected, and a pair of
output terminals 3a and 3b to which a low frequency range speaker 8 is connected. A pair of
output terminals 4a and 4b are provided to which high-range speakers 9 are connected.
The structure of the input terminals 2a and 2b is the same as that of the conventional terminal
shown in FIG.
[0016]
As shown in FIG. 2, the output terminal 3 a includes first and second terminal members 5-1 and
5-2 which are separated from each other. Further, the output terminal 3b is similarly provided
with the first and second terminal members 5-1, 5-2. A coil L is provided between the second
terminal member 5-2 of the output terminal 3a and the input terminal 2a. The second terminal
member 5-2 of the output terminal 3b is connected to the input terminal 2b by printed wiring. A
capacitor C is provided between the first terminal member 5-1 of the output terminal 3a and the
first terminal member 5-1 of the output terminal 3b. Here, the first terminal member 5-1 is one
terminal member, and the second terminal member 5-2 is the other terminal member.
[0017]
The output terminal 4a includes first and second terminal members 6-1 and 6-2 which are
separated from each other. Similarly, the output terminal 4b is provided with the first and second
terminal members 6-1 and 6-2. A capacitor C is provided between the second terminal member
6-2 of the output terminal 4a and the input terminal 2a. The second terminal member 6-2 of the
output terminal 4b is connected to the input terminal 2b by printed wiring. A coil L is provided
between the first terminal member 6-1 of the output terminal 4a and the first terminal member
6-1 of the output terminal 4b. Here, the second terminal member 6-2 is one terminal member,
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and the first terminal member 6-1 is the other terminal member.
[0018]
The first terminal member 5-1 and the second terminal member 5-2 of the output terminals 3a
and 3b, and the first terminal member 6-1 and the second terminal member 6-2 of the output
terminals 4a and 4b are respectively It is connected by the detachable conductive member 7. The
conductive member 7 is used when connecting the cables 10 of the speakers 8 and 9 to the
output terminals 3a and 3b and the output terminals 4a and 4b, respectively.
[0019]
As shown in FIG. 3, the cable 10 of the amplifier 11 is connected to the input terminals 2a and
2b, and the cables 10 of the speakers 8 and 9 are connected to the output terminals 3a and 3b
and the output terminals 4a and 4b, respectively. By connecting in this manner, the low pass
filter 12 is formed between the speaker 8 and the amplifier 11, and the high pass filter 13 is
formed between the speaker 9 and the amplifier 11. At the same time, two closed circuits
consisting of the capacitor C, the coil L and the amplifier 11 are formed.
[0020]
FIGS. 4A to 4C show the structure of the output terminals 3a, 3b, 4a and 4b of the speaker
network device according to this embodiment. Each of the output terminals 3a, 3b, 4a, 4b
includes a pair of terminal members 21 and 22 fixed to the network substrate 14, a screw 26
screwed into the housing 25 of the speaker network device, and a conductor exposed at the tip of
the cable 10. It comprises a pair of upper and lower pinching plates 23 and 24 provided between
the terminal members 21 and 22 and the head portion 26a of the screw 26 so as to sandwich the
portion 10a.
[0021]
One terminal member 21 corresponds to the first terminal members 5-1 and 6-1 of the output
terminals 3a, 3b, 4a and 4b in FIG. The other terminal member 22 corresponds to the second
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terminal members 5-2 and 6-2 of the output terminals 3a, 3b, 4a and 4b in FIG. The lower
sandwiching plate 23 corresponds to the conductive member 7 in FIG.
[0022]
The terminal members 21 and 22 are rod-like conductors bent in an L-shape as shown in FIG. 4
(B) or FIG. The terminal members 21 and 22 are inserted into the through holes 14 a of the
network substrate 14 through the through holes 25 a of the housing 25, and the printed wires
27 a and 27 b of the network circuit 1 formed on the lower surface of the network substrate 14
have respective ends 21 a, 22a are soldered and connected with solder 28.
[0023]
The printed wirings 27a and 27b are separated from each other as shown in FIG. 4 (C). The
printed wiring 27a disposed at the output terminals 3a and 3b is both connected to the capacitor
C. That is, the terminal members 21 and 21 of the output terminals 3a and 3b are connected so
as to have a capacitor C between the two printed wirings 27a. The other printed wiring 27b of
the output terminals 3a and 3b is connected to the coil L at one side and to the input terminal 2b
at the other side. The two printed wires 27a at the output terminals 4a and 4b are both
connected to the coil L. That is, the terminal members 21 and 21 of the output terminals 4a and
4b are connected by the printed wiring 27a so as to have a coil L between the two printed
wirings 27a. One of the other two printed wires 27b at the output terminals 4a and 4b is
connected to the capacitor C, and the other is connected to the input terminal 2b.
[0024]
The sandwiching plates 23 and 24 are plate-like conductors of the same type and size, and
through holes 23 a and 24 a for inserting the screws 26 are respectively formed in the central
portion. The size of each of the sandwiching plates 23 and 24 is a square shape in which the
length of one side is a length that completely overlaps the terminal members 21 and 21.
[0025]
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7
The clip plates 23, 24 and the screws 26 are provided to the user as accessories of the speaker
network device. These members, that is, the clamp plates 23 and 24 and the screw 26, are
removed from the speaker network device at the time of shipment of the speaker network device.
Then, the user who has purchased the speaker network device connects the cables 10 of the
speakers 8 and 9 using the clamp plates 23 and 24 and the screws 26 of the accessories.
[0026]
The connection of the cable 10 to each output terminal 3a, 3b, 4a, 4b is made by inserting the
screw 26 into the sandwiching plates 23, 24 and temporarily fixing to the housing 25 and then
connecting the cable between the upper and lower sandwiching plates 23, 24. This is done by
inserting the conductor exposed portion 10 a at the tip of 10 and tightening the screw 26. At this
time, the two terminal members 21 and 22 are electrically connected to each other by the lower
sandwiching plate 23 provided so as to extend over the two terminal members 21 and 22.
[0027]
Therefore, the output terminals 3a, 3b, 4a and 4b are electrically connected between the terminal
members 21 and 22 only when the cable 10 is connected. Then, as shown in FIG. 3, when the
two cables 10 extending from the respective speakers 8, 9 are connected to the respective output
terminals 3a, 3b, 4a, 4b, the capacitors C constituting the respective filters 12, 13 are provided.
And the coil L are connected. In a state where the cable 10 of one speaker is not connected, for
example, in a state where only the speaker 9 is connected, as shown in FIG. 6, the first terminal
member 5-1 of the output terminals 3a and 3b and the second terminal Since the members 5-2
are open, the capacitor C and the coil L constituting the low pass filter 12 are not connected.
Therefore, a closed circuit composed of the capacitor C and the coil L of the low pass filter 12
and the amplifier 11 is not formed.
[0028]
As described above, since the closed circuit including the capacitor C and the coil L is formed
only when the speaker 10 or the cable 10 of the speaker 9 is connected to each output terminal
3a, 3b, 4a, 4b, the cable The presence of the output terminal to which 10 is not connected can
prevent the formation of a closed circuit operating as a resonant circuit inside the device.
Therefore, it is possible to prevent the capacitor C from being damaged by the excessive current
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8
generated by the resonance.
[0029]
Further, since the circuit state is open at the time of shipment, the internal circuit does not
operate as a resonant circuit even if an external sound source such as the amplifier 11 is
connected. Therefore, even if the user who purchased this device connects only the external
sound source and leaves either one or both of the speakers 8 and 9 in a disconnected state,
problems such as capacitor breakage due to resonance do not occur.
[0030]
Moreover, according to this configuration, when the cable 10 is not connected to the output
terminals 3a, 3b, 4a, 4b, the electrical connection between one terminal member and the other
terminal member is disconnected. When the cables 10 of the speakers 8 and 9 are connected to
the output terminals 3a, 3b, 4a and 4b, one terminal member and the other terminal member are
connected by the conductive member 7. Therefore, only after the cables 10 of the speakers 8 and
9 are connected to the output terminals 3a, 3b, 4a and 4b, a closed circuit including the capacitor
C and the coil L is formed. It is possible to prevent the formation of a closed circuit operating as a
resonant circuit inside the device by the presence of the non-output terminal with a simple
configuration.
[0031]
Although the above embodiment has been described by way of an example of a network circuit
with a 1-input 2-output configuration in which the audio signal from the amplifier 11 is divided
into the low band and the high band and then output. The present invention can be effectively
applied to a network circuit having a 1-input 3-output configuration.
[0032]
In addition, the present invention can also be applied to a network circuit of a 1-input 1-output
configuration.
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9
For example, if the output terminals 4a and 4b to which the high frequency speaker 9 shown in
FIG. 2 is connected are eliminated and the circuit configuration of the high pass filter 13 is
eliminated, it can be configured as a network circuit to which only the low frequency speaker 8 is
connected. . Conversely, if the output terminals 3a and 3b to which the low-range speaker 8
shown in FIG. 2 is connected are eliminated and the circuit configuration of the low-pass filter 12
is eliminated, a network circuit is constructed in which only the high-range loudspeaker 9 is
connected. be able to.
[0033]
Further, the speaker network device may be configured to include the amplifier 11, be
configured to include one or both of the speakers 8 and 9, or be configured to include both the
amplifier 11 and the speaker.
[0034]
As described above, according to the speaker network device of the present invention, the closed
circuit operating as a resonant circuit is not formed when the speaker is not connected or in the
shipping state. It is possible to prevent the capacitor from being damaged by an excessive current
generated by resonance.
For this reason, the failure of the device can be prevented, and the lifetime of the device can be
extended.
[0035]
Brief description of the drawings
[0036]
1 is a partial cutaway view of a speaker network device according to an embodiment of the
present invention.
[0037]
2 is a circuit diagram showing a configuration example of a network circuit in the speaker
network device according to the embodiment of the present invention.
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10
[0038]
3 is a circuit diagram of a state in which an amplifier and a speaker are connected to the network
circuit shown in FIG.
[0039]
4 is a diagram showing the structure of the output terminal portion of the speaker network
device shown in FIG. 1, (A) is a cross-sectional view taken along the line A-A of (B) (the housing
portion behind the screw is omitted) (B) is a cross-sectional view taken along the line B-B seen
from the right of (A), and (C) is a partial bottom view seen from the lower side of (A).
[0040]
5 is an exploded perspective view of the output terminal of the speaker network device shown in
FIG.
[0041]
6 is a circuit diagram of a state in which a speaker is connected to only one output terminal of
the network circuit shown in FIG.
[0042]
7 is a partially broken view of the conventional speaker network device.
[0043]
8 is a diagram showing the structure of the output terminal portion of the conventional speaker
network device, (A) is a cross-sectional view, (B) is a partial bottom view seen from the lower side
of (A).
[0044]
<Figure 9> It is the schematic which shows the constitution example of the network circuit in the
former speaker network device.
[0045]
10 is a circuit diagram of a state in which the amplifier and the speaker are connected by the
network circuit shown in FIG.
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11
[0046]
11 is a circuit diagram of a state in which a speaker is connected to only one output terminal of
the network circuit shown in FIG.
[0047]
Explanation of sign
[0048]
1: Network circuit 2a, 2b: input terminal 3a, 3b, 4a, 4b: output terminal 5-1: first terminal
member (one terminal member) 5-2: second terminal member (other terminal member) 6-1: first
terminal member (other terminal member) 6-2: second terminal member (one terminal member)
7: conductive member 8: speaker 9: speaker 10: cable 11: cable 11: amplifier 12: low pass filter
13: high pass filter 14: network board 21: terminal member (output terminal) 22: terminal
member (output terminal) 23: sandwiching plate (conductive member) 24: sandwiching plate 25:
housing 26: screw 27a, 27b: printed wiring C : Capacitor L: Coil
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