Patent ID: 6336827
Filing Date: 2002-01-08
Classification: H01R,Y10S

Abstract:
A balanced-transmission cable-and-connector unit comprising:a junction substrate; a plug for balanced transmission connected to one end of said junction substrate; a cable for balanced transmission connected to the other end of said junction substrate; and a shielding cover covering said junction substrate, a portion of said plug connected to said junction substrate, and a portion of said cable connected to said junction substrate, wherein: said plug comprises a housing made of synthetic resin and alternately arranged ground contacts and pairs of signal contacts, each pair of said pairs of signal contacts having first and second leg portions between which said end of said junction substrate is inserted, the lengths of said first and second leg portions of each pair of said pairs of signal contacts being equal to one another; said cable comprises a tube-shaped outer covering portion, a tube-shaped sub-cable shielding portion provided inside said outer covering portion, a plurality of sub-cables circularly arranged along the inner surface of said sub-cable shielding portion and a filler portion filling a portion of said cable inside said plurality of sub-cables, each of said plurality of sub-cables comprising a pair of leads for balanced transmission and a lead shielding portion shielding said pair of leads; said junction substrate has a multi-layer structure and has ground lands on the obverse surface and the reverse surface at one end thereof, the lead shielding portions of said plurality of sub-cables being soldered to said ground lands, said junction substrate further having pairs of signal pads on said obverse surface and said reverse surface at the other end thereof, each pair of said pairs of signal pads comprising one pad on said obverse surface and the other pad on said reverse surface, said junction substrate further having pairs of lead connection pads on said obverse surface and said reverse surface thereof between said ground lands and said pairs of signal pads, each pair of said pairs of lead connection pads having the leads of the respective one of said plurality of sub-cables soldered thereto, said junction substrate further having a first wiring member connecting one pad of each pair of said pairs of lead connection pads with the obverse-surface-side pad of the respective pair of said pairs of signal pads using an internal layer of said junction substrate and a second wiring member connecting the other pad of each pair of said pairs of lead connection pads with the reverse-surface-side pad of the respective pair of said pairs of signal pads using another internal layer of said junction substrate, the length of said first wiring member being substantially equal to the length of said second wiring member; the first and second leg portions of each pair of said pairs of signal contacts of said plug has said junction substrate inserted therebetween, and two leg portions of each of said ground contacts of said plug has said junction substrate inserted therebetween, said first leg portion of each pair of said pairs of signal contacts being soldered to the obverse-surface side pad of the respective pair of said pairs of signal pads and said second leg portion of each pair of said pairs of signal contacts being soldered to the reverse-surface-side pad of the respective pair of said pairs of signal pads, thus said plug being connected with said end of said junction substrate; said plurality of sub-cables exposed from the end of said cable are equally separated into sub-cables on the obverse-surface side of said junction substrate and sub-cables on the reverse-surface side of said junction substrate, the pair of leads of each of said plurality of sub-cable being soldered to the respective pair of said pairs of lead connection pads, respectively; and said shielding cover has shielding-plate portions at one end thereof and shielding-arm portions at the other end thereof, said shielding-plate portions being inserted into said plug and said shielding-arm portions being connected with said sub-cable shielding portion of said cable, thus said shielding cover being fastened to said plug and said cable.