Wave transmission lines and networks – Plural channel systems – Having branched circuits
Patent
1999-03-31
2000-12-05
Bettendorf, Justin P.
Wave transmission lines and networks
Plural channel systems
Having branched circuits
333112, H01P 518
Patent
active
06157273&
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to direction couplers and, more particularly, to a direction coupler suitable for CATV.
2. Background Art
CATV cables are not always suspended in air but, in some cases, buried underground.
In addition, the number of branches (distributions) varies depending on the number of subscribers
Therefore, a variety of direction couplers with different numbers of branches are presently produced. In an air-suspended type direction coupler as shown in FIG. 5a, a first terminal A, that is, an input terminal, and a second terminal B, that is, an output terminal, are provided in surfaces opposite to each other. In an underground-placed type direction coupler as shown in FIG. 5b, a first terminal A and a third terminal C, that is, input/output terminals, are provided in a single surface.
In present cable networks, changes from suspension to underground placement and, conversely, from underground placement to suspension are expectable. In such a case, an attempt to use the existing direction couplers results in a change in the direction of wiring and incompatibility in the position of the terminal-connecting portions, which impede the connecting of cables.
In cases where the cable connections are redone from the beginning, a change in the number of branches is often required as well.
DISCLOSURE OF THE INVENTION
According to the present invention, there is provided a direction coupler that can be changed from a suspended type to a buried type or the other way around. The direction coupler has a construction wherein a mother board having a current passing circuit, a branch unit having a branching circuit and a tap plate having a distributing circuit are housed in a cover body in which connecting portions for first and second terminals are provided in a side surface thereof and a connecting portion for a third terminal is provided in another surface thereof, and wherein the branch unit has input/output terminals, and is mounted so that the mounting manner of the branch unit can be selected from a plurality of mounting manner relative to the mother board, and wherein the mother board is provided with relay terminals which are connected at positions that match position patterns of the input/output terminals corresponding to the individual mounting manners of the branch unit, so that high frequency signals can be transmitted through two terminals of said A, B and C.
The high frequency signal herein includes a television signal, a control signal, and a communication modulated signal as in telephone.
The branching circuit may be supported to the mother board so that the branching circuit can be rotated along a surface of the mother board, with a central portion of the branching circuit as a fulcrum. A branch terminal of the branch unit may be provided at a position of a center of the rotation.
The position of the input/output terminals can be selected merely by changing the mounting manner of the branching circuit. The number of branch terminals or the amount of branching can be changed simply by replacing the entire units.
Furthermore, if the branching circuit is supported to the mother board so that the branching circuit can be rotated along a surface of the mother board, with a central portion thereof being as a fulcrum, and a branch terminal of the branch unit is provided at the position of a center of the rotation, then operability improves.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an exploded view illustrating an embodiment of the direction coupler of the present invention.
FIG. 2 is an illustrative diagram of a circuit of the direction coupler.
FIG. 3 is an illustrative diagram of an internal construction of the direction coupler.
FIGS. 4a and 4b are diagrams illustrating an example of the operation of changing the terminals in position.
FIGS. 5a and 5b illustrate examples of the conventional art.
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the direction coupler of the present invention will be described with reference to the drawings.
REFERENCES:
patent: 4963966 (1990-10-01), Harney et al.
patent: 5638035 (1997-06-01), Romerein et al.
patent: 5675300 (1997-10-01), Romerein
patent: 5990759 (1999-11-01), Matsubara
Bettendorf Justin P.
Dawson Walter F.
Maspro Denkoh Co., Ltd.
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