Balanced-transmission cable-and-connector unit

• US 6,336,827 B1
• Filed: 11/09/1998
• Issued: 01/08/2002
• Est. Priority Date: 08/20/1998
• Status: Expired due to Term

• Current Assignee: Fujitsu Component Limited (Fujitsu Limited)
• Original Assignee: Fujitsu Takamisawa Component Limited
• Inventors: Akama, Junichi, Yanagisawa, Hirofumi
• Primary Examiner(s): Bradley, P. Austin
• Assistant Examiner(s): NGUYEN, TRUC T
• Application Number:
  US09/187,733
• Publication Number:
  US 20020002004A1
• Time in Patent Office: 1,156 Days
• Field of Search: 439/610, 439/98, 439/99, 439/608, 439/609, 439/941, 439/79, 174/261, 174/255, 174/760, 361/803, 361/790
• US Class Current: 439/607.46
• CPC Class Codes: H01R 12/62 connecting to rigid printed circuits or like structures
• CPC Class Codes: H01R 12/725 containing contact members presenting a contact carrying strip, e.g. edge-like strip
• CPC Class Codes: H01R 13/658 High frequency shielding arrangements, e.g. against EMI [Electro-Magnetic Interference] or EMP [Electro-Magnetic Pulse] coaxial coupling devices specially adapted for high frequency H01R24/40; for flat or ribbon cable connectors H01R12/774; for coaxial cable H01R9/05
• CPC Class Codes: H01R 9/0515 Connection to a rigid planar substrate, e.g. printed circuit board
• CPC Class Codes: Y10S 439/941 Crosstalk suppression

Abstract

A balanced-transmission cable-and-connector unit includes a junction substrate, a plug for balanced transmission connected to one end of the junction substrate, a cable for balanced transmission connected to the other end of the junction substrate, and a shielding cover covering the junction substrate, a portion of the plug at which the plug is connected to the junction substrate and a portion of the cable at which the cable is connected to the junction substrate. The plug includes a pair of first and second signal contacts, and the length of a first signal transmitting path from the first signal contact to the cable via the junction substrate is substantially equal to the length of a second signal transmitting path from the second signal contact to the cable via the junction substrate.

Claims

1. 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.

2. A connector for balanced transmission comprising:

a plug for balanced transmission;

a junction substrate, to one end of which said plug is connected, and to the other end of which a cable for balanced transmission is connected; 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-cables 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.

3. A balanced-transmission cable-and-connector unit comprising:

a junction substrate;

a plug connected to said junction substrate; and

a cable also connected to said junction substrate,

wherein;

said plug comprises pairs of signal contacts, the signal contacts of each pair thereof being located on an obverse surface and a reverse surface of said junction substrate, respectively;

said cable comprises a plurality of sub-cables, each of said plurality of sub-cables comprising a pair of leads;

said junction substrate has a multi-layer structure and connects the pair of leads of each one of said plurality of sub-cables of said cable with a respective pair of said pairs of signal contacts of said plug through signal transmitting paths, respectively, using an internal portion of said junction substrate, the lengths of said signal transmitting paths being substantially equal to one another; and

said junction substrate has pairs of signal pads, each pair of said pairs of signal pads comprising one pad on the obverse surface of said substrate and the other pad on the reverse surface of said substrate, and having the respective pair of said pairs of signal contacts of said plug connected thereto, respectively, said junction substrate further having pairs of lead connection pads, each pair of said pairs of lead connection pads having the pair of leads of a respective one of said plurality of sub-cables of said cables connected thereto, respectively, said junction substrate further having a first wiring member which connects one pad of each pair of said pairs of lead connection pads with the observe-surface-side pad of a respective pair of said pairs of signal pads using an internal layer of said junction substrate and a second wiring member which connects the other pad of the pair of said pairs of lead connection pads with the reverse-surface-side pad of the 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.