JP3272579B2 - Signal distributor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal distributor mounted on a trunk line for distributing a signal from the trunk line to each subscriber, and more particularly to a signal distributor for a CATV (abbreviation of cable television) network. .

[0002]

2. Description of the Related Art Conventionally, tap-offs for distributing signals from an outdoor trunk line to each subscriber are attached to the trunk line to form a CATV network. Usually, an AC (AC power) signal to be supplied to each home and a high-frequency signal from a television broadcast or the like are flowing through the main line. The tap-off includes an analog tap-off and a digital tap-off. When distributing signals from the trunk line, according to the analog tap-off, it is possible to supply a narrow band signal of the high-frequency signal to each subscriber from the trunk line, and according to the digital tap-off, it is possible to supply each subscriber from the trunk line with the high-frequency signal. It is possible to supply a wide band signal of several MHz to 1 GHz and supply an AC signal.

[0003] In addition, wideband high-frequency signals supplied to subscribers by digital tap-off include signals from analog telephone lines and digital telephone lines. There is a tendency for demand for tap-offs to increase.

The above-described tap-off circuit configuration includes a portion (hereinafter, referred to as a mother unit) for controlling signal input / output to / from the main line and branching of a signal input from the main line to a group of subscribers. The mother unit further includes a portion (hereinafter, referred to as a splitter unit) for further distributing the signal branched from the main line to each subscriber.

The mother unit includes, as main components, a directional coupler for branching a high-frequency signal from the main line to the splitter unit side and a choke coil for passing an AC signal from the main line. The components include a circuit for distributing a high-frequency signal to each subscriber, and a choke coil for supplying an AC signal to each subscriber and a thermistor as a current limiting element.

Conventionally, an analog tap-off has been mainly used as a distributor for a CATV network.
In the analog tap-off, a mother unit and a splitter unit are formed on one substrate.

FIG. 17 is an external view of a conventional analog tap-off, and FIG. 18 is a block diagram of the conventional analog tap-off. In FIG. 17, in the analog tap-off, a directional coupler 901 having a fixed branch loss level is fixedly attached to a substrate 900.

In FIG. 18, the analog tap-off is
An input terminal 902 and an output terminal 903, a power path 904 which is a choke coil, and a power line 904 for connecting the main line to the mother unit according to the direction of signal flow on the main line.
Directional coupler 901, including capacitors CD3 and CD4 for removing an AC signal from an input signal, and a distribution for distributing a signal branched from the mother unit side by the directional coupler 901 to the subscriber side to the splitter unit side to the subscriber side. 905-907, and distribution terminals 908-911 for distributing signals from the distributors 905-907 to each subscriber.

[0009] A power path 904 is provided between the trunks, and an AC signal flowing through the trunk passes therethrough. On the other hand, the high-frequency signal flowing through the main line passes through the directional coupler 901 via the capacitor CD3, and is divided by the splitter unit side
And returns to the main line via the capacitor CD4. On the other hand, the distribution terminal 908 on the splitter unit side
To 911 are supplied with high-frequency signals distributed via the directional coupler 901 and the distributors 905 to 907.

[0010]

In recent years, the demand for transmission of high-quality signals has increased, and the infrastructure of digital CATV networks has started to be improved. Therefore, it has become necessary to replace analog tap-offs with digital tap-offs. Therefore, efficient tap-off exchange is desired.

Conventionally, in the case of changing the distribution loss of the distribution terminals or changing the number of distribution terminals in the tap-off, the tap-off mother unit and the splitter unit are integrally formed on a single substrate. , It was necessary to remove the tap-off from the main line and replace it with another tap-off, which was not efficient.

Also, in the conventional tap-off, as shown by a dotted arrow in FIG. 17 or FIG. 18, the direction of signal flow in the trunk is specified in one direction, so that the signal flow in the trunk is changed in the opposite direction. In such a case, it is necessary to switch the connection with the main line so that the tap-off itself matches the direction in which the changed signal flows, which is troublesome.

Conventionally, the trunk line and the tap-off may be electrically connected via a jack to which the trunk line is connected. FIG. 19 is a conceptual diagram for explaining conventional tap-off using a jack and connection switching of a trunk line. The tap-off in the figure includes the jack R so that the signal always flows in the direction of the dotted arrow in the figure, and the signal input / output between the main line and the tap-off when mounted on the ground so as to support both the ground-mounted type and the underground buried type. Input / output terminals 902 and 903 for input / output, and input / output terminals 912 and 913 for inputting / outputting a signal between a trunk line and tap-off when buried underground.
including.

In the figure, for example, when the tap-off is changed from the ground-mounted type to the underground buried type, the jack R has to be rotated 90 ° from the direction R1 in the figure to the direction R2. This rotation was troublesome due to the work of removing and attaching screws (not shown) for fixing the jack R to the substrate 900.

In the conventional tap-off, since the directional coupler 901 is fixed to the substrate 900 as shown in FIG. 17, the loss level of the signal branched from the main line, that is, the signal attenuation level is reduced. Had been fixed. Therefore, the signal attenuation level in the signal branch from the trunk cannot be changed unless the tap-off itself is replaced, and the diversity of signals distributed to each subscriber is limited.

In the conventional tap-off, as the number of distribution terminals increases, the length of the high-frequency signal line on the substrate 900 increases, and the high-frequency characteristics deteriorate.
Increases the area of the device, which hinders the miniaturization of the tap-off.

Further, since the conventional tap-off is formed by soldering the chassis and the board via the distribution terminal, the board cannot be replaced without removing the tap-off from the main line, and efficient maintenance of the tap-off can be achieved. Had been inhibited.

It is therefore an object of the present invention to provide a signal distributor which facilitates replacement of a signal distributor attached to a main line.

Another object of the present invention is to provide a signal distributor which can easily cope with a change in the mounting mode or the signal distribution mode.

Still another object of the present invention is to provide a signal distributor which enables efficient maintenance.

[0021]

Means for Solving the Problems] signal splitter according to claim 1 is intended for each subscriber to distribute signals from the mains, it is connected to the mains inputs a signal from the trunk line Terminal, a branching unit for branching a signal input from the input terminal, and a trunk line for inputting a signal through the input terminal and the branching unit and outputting the signal to the trunk line.
It is a first portion including the output terminals, and a second portion comprising a dispensing supplies distributor to the distribution terminal to input branched signal distribution terminal and bifurcation corresponding to each subscriber, signals the length of the connection direction of the trunk of the distributor body, already a signal splitter
When connecting to the trunk line in exchange for that of the existing
Disconnect the input and output terminals of the
Complete by connecting main lines to input and output terminals
Configured characterized that it is a long.

Since the signal distributor according to claim 1 is configured as described above, when replacing the existing signal distributor using this signal distributor, disconnection of the main line from the existing signal distributor and renewal of the existing signal distributor are performed. The work can be completed only by wiring between the main signal line and the signal distributor.

A signal distributor according to a second aspect of the present invention is a signal distributor connected to a main line for distributing a signal from the main line to each subscriber, and an input terminal for inputting a signal from the main line. A first portion including a branching portion for branching a signal input from the input terminal, an input terminal, and an output terminal for inputting a signal through the branching portion and outputting the signal to the main line; A second part including a distribution terminal and a distribution part for inputting the signal branched by the branch part and distributing the signal to the distribution terminal, wherein a signal input / output direction is changed to a predetermined direction in the main body of the signal distributor. Further, the first portion is provided with means for matching the direction of signal flow in the first portion with a predetermined direction.

Since the signal distributor according to the second aspect is configured as described above, it is possible to obtain a signal distributor corresponding to both directions of the signal flow in the trunk line. Also, 1
Two signal distributors can be selectively adapted to both the type of installation on a trunk line above the ground and the type of installation buried in a trunk line underground.

According to a third aspect of the present invention, there is provided a signal distributor connected to a main line for distributing a signal from the main line to each subscriber, and an input terminal for inputting a signal from the main line and an input terminal. A first portion including a branching portion for branching a signal input from a terminal, an input terminal, and an output terminal for inputting a signal via the branching portion and outputting the signal to a main line, and a distribution corresponding to each subscriber A second portion including a terminal and a distribution portion that inputs a signal branched by the branch portion and distributes the signal to the distribution terminal, wherein the branch portion is detachably provided on the first portion.

Since the signal distributor according to the third aspect is configured as described above, it is possible to easily select and set the loss level in the signal branch from the main line in the branch section.

According to a fourth aspect of the present invention, there is provided a signal distributor connected to a main line for distributing a signal from the main line to each subscriber, and an input terminal for inputting a signal from the main line. , To split the signal input from the input terminal
The removable partial Kibe, and the input terminal and to input signals via the branch portion and the first portion including an output terminal for outputting to the mains, is branched by the distributor terminals and branches of the corresponding to each subscriber A second part including a distribution unit for inputting and distributing the supplied signal to the distribution terminal, wherein the signal from the main line includes a predetermined signal and a power signal, and the second part further includes a distribution terminal corresponding to the subscriber. Each device is provided with means for controlling whether or not a power signal is supplied.

Since the signal distributor according to the fourth aspect is configured as described above, it is possible to easily control whether or not a power signal is supplied to each distribution terminal.

According to a fifth aspect of the present invention, there is provided a signal distributor connected to a main line for distributing a signal from the main line to each subscriber, and an input terminal for inputting a signal from the main line and an input terminal. A first portion including a branching portion for branching a signal input from a terminal, an input terminal, and an output terminal for inputting a signal via the branching portion and outputting the signal to a main line, and a distribution corresponding to each subscriber A second portion including a terminal and a distribution portion that inputs the signal branched by the branch portion and distributes and supplies the signal to the distribution terminal, wherein the signal from the main line includes a predetermined signal and a power signal, and in the second portion, The wiring of the predetermined signal and the wiring of the power signal are pattern-developed so as to be line-symmetric between the paired distribution terminals.

Since the signal distributor according to the fifth aspect is configured as described above, even when the wiring of the predetermined signal and the wiring of the power signal are mixed, the electrical characteristics (frequency Characteristics) can be the same.

The signal distributor according to claim 6 is connected to a main line and distributes a signal from the main line to each subscriber, and an input terminal for inputting a signal from the main line.
Branch portion for branching the signal inputted from the input terminal, and the input terminal and to input signals via the branch portion and including a first portion of the output terminals on the same substrate for outputting to the mains, the enter the signal branched by the distributor terminals and branches of the corresponding subscriber comprises distributing supply distributor to the distribution terminal, and a second portion separable from the first portion, the trunk in part 1 min And the board are separated by separate screw members.
Ri, characterized in that it is electrically connected by screwing member respectively and trunk of the input and output terminals by bonding.

Since the signal distributor according to claim 6 is configured as described above, a contact failure due to a variation in the production of the contact between the main line and the input / output terminal can be avoided. Further, since the connection is made electrically by the screw member, the contact resistance can be reduced. Further, even when the terminal or the main line is corroded, it is possible to achieve the electrical connection via the screwing member.

A signal distributor according to a seventh aspect is connected to a main line and distributes a signal from the main line to each subscriber, and inputs a signal from the main line to the first substrate. Terminal including an input terminal for inputting a signal, a detachable branching portion for splitting a signal input from the input terminal, and an output terminal for inputting a signal through the branching portion and outputting the signal to the main line. And a second portion including a distribution terminal corresponding to each subscriber on the second substrate and a distribution unit that inputs a signal branched by the branch unit via a signal line and distributes the signal to the distribution terminal. The first portion and the second portion are characterized by being separable from each other.

[0034] The signal distributor according to claim 7 is configured as described above, and by replacing only the second part,
The distribution loss of the distribution terminals can be arbitrarily changed, and the number of terminals can be easily changed.

The signal distributor according to claim 8 is the signal distributor according to claim 7.
In the signal distributor described in, when there are many distribution terminals,
The distribution terminals are divided into a plurality of groups of the same size in advance, the signal lines are provided corresponding to each of the groups, and the signal lines are similarly developed in the second part in the corresponding groups.

Since the signal distributor according to the eighth aspect is configured in this manner, even if the number of distribution terminals is large, the signal routing can be shortened, the frequency characteristics of the signal do not deteriorate, and the second aspect is achieved. An increase in the area of the substrate is suppressed.

According to a ninth aspect of the present invention, there is provided a signal distributor according to the seventh aspect.
Or the signal distributor according to 8 has a housing member for housing the first portion, and the first substrate is detachably provided on the housing member in a state where the housing member is connected to the main line. It is characterized by.

Since the signal distributor according to the ninth aspect is configured as described above, only the first substrate can be easily replaced without removing the housing member of the first portion from the main line. Workability in the maintenance of the signal distributor is improved.

[0039]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of tap-off according to an embodiment of the present invention.

FIG. 2 is an external view of the tap-off according to the embodiment of the present invention, and shows the appearance of the tap-off from the side in the longitudinal direction (main line connection direction). The tap-off shown in FIG.
And the splitter unit 200 are formed on separate substrates. Each substrate exists in a state where it is individually covered by the chassis 120. FIG. 2 shows a state in which the boards covered by the chassis 120 are overlapped with each other.

The mother unit 100 has terminals X, Y and Z for connecting and disconnecting the main line and the tap-off to input and output signals.
Are provided in the splitter unit 200, and distribution terminals C1, D1, and D2 for distributing signals from the trunk line to the respective subscribers.
E1 and F1 are provided. The tap-off shown in FIG. 2 is formed so that the units 100 and 200 can be separated. Terminals X, Y, and Z are connected to a main line at terminals X and Y when mounted on the ground so that tap-offs can be applied to both the ground-mounted type and the underground buried type.
When buried underground, a trunk line is connected to Y and Z.

As described above, since the mother unit 100 and the splitter unit 200 are formed on different substrates, maintenance can be performed individually and efficient maintenance of tap-off can be performed.

FIG. 3 shows the unit 100 corresponding to the upper surface of the substrate H inserted in the mother unit 100 of FIG.
Are shown in the longitudinal direction (main line connection direction). Also,
FIG. 4 shows a side surface of the unit 200 in the longitudinal direction (main line connection direction) corresponding to the upper surface of the substrate G inserted into the splitter unit 200 of FIG.

In FIG. 3, the mother unit 100 includes a substrate H, and further includes screws B, C and D, sockets 121 and 122, and short jumpers 103 and 104 on the substrate H.

Each of the screws B, C and D is a terminal X,
Provided corresponding to each of Y and Z, substrate H is connected to terminals X, Y and Z via screws B, C and D. The main line is the chassis 120 of the mother unit 100.
The terminal (X, Y, and Z) is guided inside the unit 100 while being fixed by a mold member integrally formed inside the unit.
Is combined with The sockets 121 and 122 are provided for detachably attaching a directional coupler, which will be described later, to the board H.

Further, the jumpers 103 and 104 are attached to the board H in such a manner that they can be inserted and removed from the outside. When the jumper 103 is inserted and removed, the presence or absence of signal conduction between the terminals X and Y in the direction of the dotted arrow AR1 or AR2 in the figure. It is determined, and the presence or absence of conduction of the signal in the direction of the dotted arrow AR3 in the drawing of the signal between the terminals Y and Z is determined by the insertion and removal of the jumper 104.

The splitter unit 200 shown in FIG.
including. The board G includes distribution terminals C1, D1, E1, and F1 provided for each subscriber, and further includes short jumpers 204, 205, 206 corresponding to the respective distribution terminals.
And 207 are provided. These short jumpers can be manually inserted into and removed from the board G from outside. Each of the jumpers 204 to 207 has a corresponding distribution terminal and a line 400 for an AC signal to be described later, which is supplied through a main line.
To control the conduction / non-conduction of the Jumper 2
When each of the terminals 04 to 207 is removed from the substrate G, the corresponding distribution terminal and the AC signal line 400 become non-conductive, and no AC signal is supplied to the distribution terminal. The distribution terminal and the AC signal line 400 are brought into conduction and an AC signal is supplied to the distribution terminal. Therefore, each substrate G of the jumpers 204 to 207
By plugging in or unplugging, it is possible to easily control whether or not an AC signal is supplied to each distribution terminal (each subscriber).

Further, in order to make maintenance of tap-off easier, the mother unit 100 shown in FIG. 3 is detached from the chassis 120 of the unit 100 while the unit 100 is still attached to the main line. You can also. This will be described with reference to FIG. 5 using an external view of the mother unit shown in FIG.

In the figure, the mother unit 100 has a board H and a chassis 12 in addition to the screws B, C and D.
Screws S, T, U and V for connecting to bottom surface
Is provided. Receiving holes 106 to 109 are formed in advance on the bottom surface of the chassis 120 so as to correspond to the screws S, T, U and V, respectively, and the screws S, T, U and V are received therein. The board H is fixedly mounted in the unit 100 when engaged with the holes 106 to 109 and screwed. On the other hand, when the board H is removed from the chassis 120 by the screws S, T, U, and V, and further, when the board H is removed from the terminal, that is, the trunk by the screws B, C, and D, the board H is removed from the unit 100. Can be taken out.

Thus, only by removing the screw, only the board H can be easily replaced while the chassis 120 of the mother unit 100 is attached to the main line, and the efficiency of tap-off maintenance is improved.

FIG. 1 shows a block diagram of the tap-off, which includes a mother unit 100 and a splitter unit 2.
The circuit configuration with 00 is shown together with the connection relationship between them.

Note that the block diagram of FIG. 1 is applicable to a case where both units are formed on individual substrates and a case where both units are formed on a single substrate.

In the figure, a mother unit 100 and a splitter unit 200 are connected via a high-frequency signal line 300 for transmitting a high-frequency signal and an AC signal line 400 for transmitting an AC signal. The lines 300 and 400 are provided detachably between the two units so that the boards of each unit can be easily replaced individually.

The mother unit 100 includes a jumper 103
And 104, and power paths 101 and 105 composed of choke coils for passing an AC signal input from the main line via terminals X, Y and Z, a directional coupler 102, and an AC signal from the input signal from the main line. Includes capacitors CD1 and CD2 for removal and output.

The splitter unit 200 includes distributors 201 to 203 for distributing the high-frequency signal supplied from the high-frequency signal line 300 and supplying them to the distribution terminals F1, E1, D1, and C1, respectively. The supplied AC signal is distributed to distribution terminals F1, E1,.
It includes each of power paths 208 to 211 and each of short jumpers 204 to 207 corresponding to each distribution terminal for supplying to each of D1 and C1.

In the figure, the power path is between the trunk lines (terminal X-
Y and terminals YZ), trunk lines and distribution terminals F1, E1, D
1 and C1, respectively, and the AC signal passes therethrough. In particular, since each of the jumpers 204 to 207 is provided between each distribution terminal and the AC signal line 400, A is connected to the distribution terminal according to the subscriber's request.
The C signal is supplied or not, and the corresponding jumper board G
It can be easily controlled by plugging in and out.

By the way, depending on whether the directional coupler 102 is mounted on the socket 121 or the socket 122 of the board H, the direction in which the high-frequency signal flows in the mother unit 100 can be switched. This will be described with reference to a circuit diagram of the directional coupler 102 in FIG. 1 in FIG. 6 and a detailed wiring diagram around the directional coupler in FIG. 1 in FIG.

As is well known, the directional coupler 102 has directionality. In FIG. 6, a terminal 1021 is an input terminal, a terminal 1022 is an output terminal, and a terminal 1023 is a branch terminal serving as an output terminal to the splitter unit 200. Is set to

When the directional coupler 102 of FIG. 6 is inserted into the socket 121 of FIG. 7, a current flows in the direction of the dotted arrow AR2 in the figure. That is, from the input terminal X to the output terminal Y
The signal flows in the direction. Further, when inserted into the socket 122, a current flows in the direction of the dotted arrow AR1 in the figure.
That is, a signal flows from the input terminal Y to the output terminal X. Therefore, it is possible to easily change the direction of signal flow in the main line only by changing the insertion position of the directional coupler 102 into the board between the sockets 121 and 122, and to make the tap-off a bidirectional tap-off. it can.

When the jumper 104 is inserted into the board H and the jumper 103 is pulled out of the board H, the tap-off is enabled and the tap-off can be performed.
When 4 is removed from the substrate H and the jumper 103 is inserted into the substrate H, the underground burial is enabled.

As described above, when the tap-off is mounted on the ground, the signal from the main line in the mother unit 100 in FIG. 3 flows between the terminals XY in FIG. Flows between terminals Y → Z.

In the mother unit 100, when a signal from the main line is input from the terminal Y, the input signal flows in the direction of the dotted arrow AR1 in the figure. Therefore, the input signal is applied to the directional coupler 102 after the AC signal is removed by the capacitor CD1, output to the high-frequency signal line 300, and output to the trunk via the capacitor CD2. Also, when a trunk signal is input from terminal X,
The input signal flows in the direction of the dotted arrow AR2 in the figure. Therefore, the input signal is applied to the directional coupler 102 after the AC signal is removed by the capacitor CD2, output to the high-frequency signal line 300, and
Output to the main line via D1.

As described above, each subscriber is supplied with the high-frequency signal and the AC signal as desired through the corresponding distribution terminal.

In the above-described directional coupler 102, a signal from the main line is guided (branched) to the high-frequency signal line 300.
At times, signal loss occurs at a level inherent to the combiner 102. This loss level also affects the signal level supplied to each distribution terminal. Therefore, if it is desired to change the supply signal level at each distribution terminal, the directional coupler 10
2 is detachably provided on the substrate H, the existing coupler may be replaced with a coupler having a desired signal loss level.
It is possible to easily change the level of the branch loss of the signal to the distribution terminal, and furthermore, the level of the signal supplied to each distribution terminal.

Here, a description will be given with reference to a detailed circuit diagram from the AC signal line 400 to the distribution terminal in FIG. 1 of FIG. 8, a choke coil 501 as a power path, terminals 502 and 503, and a thermistor 504 as a current limiting element are provided between the AC signal line 400 and each distribution terminal. The connection between the terminals 502 and 503 can be controlled so as to take either a conductive state or a non-conductive state by inserting and removing a jumper from the board.

Further, this control can be performed by inserting and removing the choke coil 501 and the thermistor 504 from the substrate of the molded product instead of the short jumper. FIG. 9 is a conceptual diagram showing the insertion and removal of the molded product of the choke coil and the thermistor of FIG. 8 from the substrate. In the figure, a molded product is formed integrally with a substrate 507, and a choke coil 501 and a thermistor 504 are formed on the substrate 507 via a solder 506 while having an electrical connection. Further, the molded product is inserted / removed through the socket 505 and the pin 508 into the substrate on the splitter unit 200 side provided with the socket 505 for engaging the pin 508 in advance via the conductor pin 508.

FIG. 10 is a diagram schematically showing a mounting state of a high-frequency signal line when the mother unit and the splitter unit according to the embodiment of the present invention are formed on separate substrates. In the figure, the mother unit 100 and the splitter unit 200 are formed on separate substrates, are both independent units, and are connected by two high-frequency signal lines 300.

FIG. 11 shows the splitter unit 20 of FIG.
FIG. 4 is a conceptual diagram of pattern development of a high-frequency signal line at 0, where the output of the directional coupler 102 is connected to a distributor DIV, and the output thereof is connected to the splitter unit 200 via two high-frequency signal lines 300. In FIG. 11, eight distribution terminals 220 to 227 are provided for tap-off. Then, these eight distribution terminals are divided in advance into groups of the same size corresponding to each of the two signal lines 300. Therefore, in FIG. 11, the pattern development of each signal line 300 is the pattern development of four distribution terminals.

FIG. 12 is a diagram schematically showing the state of mounting a high-frequency signal line between the mother unit and the splitter unit for comparison with FIG. 10, and FIG. 13 is a diagram showing the state of the splitter unit of FIG. 12 for comparison with FIG. It is a conceptual diagram of the pattern development of a high frequency signal line.

In the case where the number of distribution terminals is as large as eight, for example, as shown in FIG. 10, two high-frequency signal lines 300 are provided for transmitting high-frequency signals from the mother unit 100 to the splitter unit 200. 11
As shown by, a pattern corresponding to the four distribution terminals is developed for each signal line 300. On the other hand, when one high-frequency signal line 300 is provided between both units as shown in FIG. 12, a pattern development by eight distribution terminals is required for the signal line 300 as shown in FIG. It is said. Comparing the pattern developments of FIG. 11 and FIG. 13, the signal loss at each distribution terminal is suppressed as much as that of FIG. 11 since the routing of the signal line 300 is shorter than that of FIG. The substrate area of the splitter unit 200 can be small, and the tap-off can be easily reduced in size.

The above-described pattern development for each distribution terminal of the signal line is desirably performed so that electrical characteristics such as frequency characteristics of signals at each distribution terminal are uniform. Changes in the electrical characteristics of each distribution terminal are caused by variations in the length or thickness of the wiring.
Consider a pattern development that makes the length of the signal line to each distribution terminal in the splitter unit 200 uniform. Since the thickness of the signal line can be easily fixed,
Here, description will be made assuming that the thickness of the signal line is uniform.

FIG. 14 and FIG. 15 are views showing an example of pattern development for uniforming the electrical characteristics of each distribution terminal on the substrate of the splitter unit according to the embodiment of the present invention, and other examples. . In FIG. 14, the input side (I
NPUT) to the distribution terminals OUT1 and OUT2, and the pattern development of the high-frequency signal line 300 and the AC signal line 400 is shown. In FIG. 15, the input side (INPUT) is shown.
, The pattern development of lines 300 and 400 from the distribution terminals OUT1 to OUT4.

In FIG. 14, the distribution terminals OUT1 and OUT2 forming a pair with respect to the distributor DIV are pattern-developed so as to be line-symmetric with respect to the dotted line L1, so that the electric characteristics of the terminals OUT1 and OUT2 are uniform. Become. FIG.
Similarly, the terminals OUT1 to OUT4 forming a pair for each distributor DIV are pattern-developed so as to be axisymmetric with respect to the dotted lines L2, L3 and L4. The characteristics are uniform.

By the way, with the diversification of use of CATV cables by CATV subscribers, more current flows through the trunk line than before, so a more reliable contact structure between the tap-off board and the trunk line is required. desired. This is shown in FIG.
A description will be given with reference to FIG. 6 showing a contact structure between a tap-off substrate and a trunk line according to an embodiment of the present invention.

In FIG. 16, lug terminals for inputting and outputting signals from the tap-off board and the main line are connected via screws functioning as conductors. Generally, the trunk wire is connected to the lug terminal while being fixed by the mold member, and both are electrically connected. However, if the connection portion is corroded, a good electrical connection cannot be obtained. Therefore, as shown in FIG. 16, if a conductive state is maintained between the lug terminal and the main line by using a conductor screw in this connection portion, a highly reliable contact structure can be obtained.

Further, it is possible to avoid a connection failure due to a variation in the production of each part of the contact. In addition, the contact resistance can be reduced by using the screw as the conductor.

Further, the tap-off according to another embodiment of the present invention may be formed so as to be longer in the trunk connection direction than the conventional tap-off of FIG. For example, if it is desired to convert the existing tap-off of FIG. 17 to another tap-off in accordance with the development of the network infrastructure in which the tap-off of FIG. 17 is attached to the main line, another tap-off is installed. If it is longer in the trunk connection direction than that of, the tap-off can be exchanged only by the connection and wiring of the trunk, and the tap-off can be promptly exchanged.

[Brief description of the drawings]

FIG. 1 is a block diagram of a tap-off according to an embodiment of the present invention.

FIG. 2 is an external view of a tap-off according to the embodiment of the present invention.

FIG. 3 shows a longitudinal direction of the unit (main line connecting direction) corresponding to the upper surface of the substrate inserted into the mother unit of FIG. 2;
FIG.

4 is a view showing a side surface in a longitudinal direction (main line connection direction) of the unit corresponding to an upper surface of a substrate inserted in the splitter unit of FIG. 2;

FIG. 5 is an external view of the mother unit of FIG. 3 in a state in which the motherboard is stopped.

FIG. 6 is a circuit diagram of the directional coupler of FIG. 1;

FIG. 7 is a detailed wiring diagram around the directional coupler in FIG. 1;

FIG. 8 is a detailed circuit diagram between an AC signal line and a distribution terminal in FIG. 1;

FIG. 9 is a conceptual diagram showing insertion and removal of a molded product of the choke coil and the thermistor of FIG. 8 from a substrate.

FIG. 10 is a diagram schematically illustrating a mounting state of a high-frequency signal line when a mother unit and a splitter unit according to an embodiment of the present invention are formed on separate substrates.

FIG. 11 is a conceptual diagram of pattern development of a high-frequency signal line in the splitter unit of FIG.

FIG. 12 is a diagram schematically illustrating an attached state of a high-frequency signal line between a mother unit and a splitter unit for comparison with FIG. 10;

FIG. 13 is a conceptual diagram of pattern development of a high-frequency signal line in the splitter unit of FIG. 12 for comparison with FIG.

FIG. 14 is a diagram showing an example of pattern development for detecting electrical characteristics at distribution terminals on a substrate of the splitter unit according to the embodiment of the present invention.

FIG. 15 is a diagram showing another example of pattern development for making electrical characteristics uniform at distribution terminals on the substrate of the splitter unit according to the embodiment of the present invention.

FIG. 16 is a diagram showing a contact structure between a tap-off substrate and a main line according to an embodiment of the present invention.

FIG. 17 is an external view of a conventional analog tap-off.

FIG. 18 is a block diagram of a conventional analog tap-off.

FIG. 19 is a conceptual diagram for explaining connection switching between tap-off and trunk using a conventional jack.

[Description of References] 100 Mother unit 200 Splitter unit 300 High frequency signal line 400 AC signal line X, Y, Z Input / output terminals C1, D1, E1, F1 Distribution terminals Note that the same reference numerals in the drawings indicate the same or corresponding parts. .

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tatsuo Maeda 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka Inside Sharp Corporation (72) Inventor Kimiaki 22-22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka Sharp Corporation (56) References JP-A-60-165874 (JP, A) JP-A-3-289875 (JP, A) JP-A-63-209316 (JP, A) JP-A-4-282583 (JP, A) 47-9317 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04N 5/00 H04N 7/10 H04N 7/14-7/173 H04N 7/20-7 / twenty two

Claims (9)

(57) [Claims] 1. A signal distributor for distributing the signal from the trunk line to each subscriber, the input terminal for inputting the signal from the previous SL trunk is connected to the main line, from the input terminal the includes a branch unit, and connected output terminal to the main line for outputting the input terminal and to input the signal through the branch portion to the trunk line for branching the input the signal 1
And a second part including a distribution terminal corresponding to the subscriber and a distribution unit that inputs the signal branched by the branch unit and distributes the signal to the distribution terminal. The length of the trunk line in the connection direction is
Replace the signal distributor with the existing one and connect to the trunk line
The input terminal and the output of the existing one.
Terminal from the main line to disconnect the signal distributor.
Complete by wiring the main line to the power terminal and the output terminal
Characterized in that it is a length that, the signal distributor. 2. A signal distributor connected to a main line for distributing a signal from the main line to each subscriber, comprising: an input terminal for inputting the signal from the main line, and an input terminal for inputting from the input terminal. A first part including a branching unit for branching the obtained signal, the input terminal, and an output terminal for inputting the signal via the branching unit and outputting the signal to the trunk line; And a second portion including a distribution portion that inputs the signal branched by the branch portion and distributes and supplies the signal to the distribution terminal, wherein the input / output direction of the signal is predetermined in the main body of the signal distributor. The signal distributor, further comprising: a unit that, when changed in direction, causes the first portion to match a direction in which the signal flows therein to the predetermined direction. 3. A signal distributor connected to a main line for distributing a signal from the main line to each subscriber, comprising: an input terminal for inputting the signal from the main line; and an input terminal for inputting from the input terminal. A first part including a branching unit for branching the obtained signal, the input terminal, and an output terminal for inputting the signal via the branching unit and outputting the signal to the trunk line; And a second portion including a distribution portion that inputs the signal branched by the branch portion and distributes and supplies the signal to the distribution terminal. The branch portion is detachably provided on the first portion. A signal distributor, characterized in that: 4. A signal distributor connected to a main line for distributing a signal from the main line to each subscriber, comprising: an input terminal for inputting the signal from the main line; and an input terminal for inputting from the input terminal. wear for branching the signal
Detachably minute Kibe, and the first portion having an input terminal and through the branch portion to input the signal including an output terminal for outputting to the main line, corresponding distribution terminal and the said each subscriber A second portion including a distribution portion that inputs the signal branched by the branch portion and distributes and supplies the signal to the distribution terminal. The signal from the main line includes a predetermined signal and a power signal. Further, the signal distributor further includes means for controlling whether or not the power signal is supplied for each of the distribution terminals corresponding to each of the subscribers. 5. A signal distributor connected to a main line for distributing a signal from the main line to each subscriber, comprising: an input terminal for inputting the signal from the main line, and an input terminal for inputting from the input terminal. A first part including a branching unit for branching the obtained signal, the input terminal, and an output terminal for inputting the signal via the branching unit and outputting the signal to the trunk line; A second part including a corresponding distribution terminal and a distribution part that inputs the signal branched by the branch part and distributes and supplies the signal to the distribution terminal. The signal from the main line includes a predetermined signal and a power signal. The signal distributor according to claim 2, wherein, in the second part, the wiring of the predetermined signal and the wiring of the power signal are pattern-developed so as to be line-symmetric between the paired distribution terminals. 6. A signal distributor connected to a main line for distributing a signal from the main line to each subscriber, comprising: an input terminal for inputting the signal from the main line; branch portion for branching the signal, and an output terminal for the input terminal and to input the signal through the branch portion for outputting to the main line
Same includes a including a first portion on a substrate, said each subscriber to a corresponding distribution terminal and the distributor to supply distribution unit to said dispensing terminal to input the signal branched by the branching unit, the first portion and a second portion separable and, it separates the substrate and the main line in the first part minute
Flip by joining the stop member, and each said trunk of the entering input terminals and said output terminals, characterized in that it is electrically connected by a stop member Flip sleep the signal distributor. 7. A signal distributor connected to a main line for distributing a signal from the main line to each subscriber, and an input terminal for inputting the signal from the main line on a first substrate. A detachable branching unit for branching the signal input from the input terminal, and an output terminal for inputting the signal via the input terminal and the branching unit and outputting the signal to the trunk line. A second portion including a distribution terminal corresponding to the subscriber on a second substrate and the signal branched by the branching unit via a signal line and distributing the signal to the distribution terminal; A signal distributor, comprising: a first section and a second section, wherein the first section and the second section are separable from each other. 8. When the number of the distribution terminals is large, the distribution terminals are divided into a plurality of groups of the same size in advance, the signal lines are provided corresponding to each of the groups, and the signal lines are provided in the second portion. The signal distributor according to claim 7, wherein each of the groups is similarly subjected to pattern development in the corresponding group unit. 9. The signal distributor has a housing member for housing the first portion, and the first substrate is detachable from the housing member with the housing member connected to the main line. The signal distributor according to claim 7, wherein the signal distributor is provided as follows.