Electricity: conductors and insulators – Boxes and housings – Hermetic sealed envelope type
Patent
1997-06-11
1999-10-26
Kincaid, Kristine
Electricity: conductors and insulators
Boxes and housings
Hermetic sealed envelope type
361622, 361736, 439 761, H02G 308
Patent
active
059732628
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE ART
The present invention relates to a multi-tap distribution apparatus. More particularly, the present invention relates to a multi-tap distribution apparatus which is suitable for use with CATV cables.
BACKGROUND ART
Distribution apparatus for being interposed in CATV transmission cables come in different types due to the needs to provide input and output cable connecting portions in different positions and also to provide various numbers of taps. To meet these needs, multi-tap distribution apparatuses for general purpose use have been proposed whose internal mechanisms are composed of a plurality of modules. In one type of such general-purpose distribution apparatuses, a mother board with a current transmission circuit and a branch circuit board are designed in modules that can be assembled in different ways to suit particular applications.
CATV transmission cables carry not only television signals, control signals, and other high-frequency signals but also currents for operating main line amplifiers. For this reason, the above-mentioned type of distribution apparatuses are designed to transmit currents therethrough. Currents should not be carried through the branch circuit or the distribution circuit of this type of apparatuses. To avoid this, these distributors have a dedicated circuit provided in a mother board especially for current transmission and connect the input and output cable connecting portions via the dedicated circuit. Generally, these apparatuses employ an insertion type connecting structure to connect the mother board with the transmission cables, which are directly coupled to the input and output cable connecting portions.
Although only currents of low amperage are passed to each tap in this type of apparatuses, the cable connecting portions carry the same maximum currents as the main line does. Therefore, the transmission losses between the input and output cable connecting portions must be reduced and any adverse effect on the characteristics of the electromagnetic waves must be also minimized.
However, the aforementioned insertion type connecting structure causes not only transmission losses easily but also over-heating if a current of high amperage is carried therethrough, so that the heat may affect the characteristics of the circuits mounted on the mother board.
SUMMARY OF THE INVENTION
It is therefore an object of the invention to provide a distribution apparatus in which transmission losses at the connections between ends of transmission lines and input and output terminals of a mother board are reduced.
It is another object of this invention to provide transmission lines for electrically connecting the input and output terminals of a mother board to cable connecting portions provided on sides of a case comprising the mother board.
It is a further object of this invention to provide lands around through-holes in the mother board into which electrically conductive screws are inserted to establish electrical connections between the transmission lines and the input and output terminals of the mother board.
These and other objects are further accomplished by a distribution apparatus for being interposed in a transmission cable, the distribution apparatus comprising, a built-in mother board disposed in the approximate center of a case, the mother board including, a branch circuit for distributing as output signals high-frequency signals received at an input terminal of the mother board, and a current transmission circuit for allowing currents to be transmitted between the input terminal and an output terminal of the mother board, transmission lines for electrically connecting the input and output terminals of the mother board to cable connecting portions provided on sides of the case, the transmission lines each having a center conductor with a threaded hole formed in one end thereof, each of the central conductors of each of the transmission lines is disposed in a groove formed in an inner wall of the case without being in contact with the inner wall, and a stru
REFERENCES:
patent: 3617811 (1971-11-01), McVoy
patent: 4755776 (1988-07-01), Preschutti
patent: 4963966 (1990-10-01), Harney et al.
patent: 5058198 (1991-10-01), Rocci et al.
patent: 5334050 (1994-08-01), Andrews
patent: 5613859 (1997-03-01), Bellantoni et al.
Kincaid Kristine
Maspro Denkoh Co., Ltd.
Silverio William
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