Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
  • H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
  • H01R12/50—Fixed connections
  • H01R12/59—Fixed connections for flexible printed circuits, flat or ribbon cables or like structures
  • H01R12/62—Fixed connections for flexible printed circuits, flat or ribbon cables or like structures connecting to rigid printed circuits or like structures
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
  • H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
  • H01R12/50—Fixed connections
  • H01R12/59—Fixed connections for flexible printed circuits, flat or ribbon cables or like structures
  • H01R12/594—Fixed connections for flexible printed circuits, flat or ribbon cables or like structures for shielded flat cable
  • H01R12/596—Connection of the shield to an additional grounding conductor, e.g. drain wire
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
  • H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
  • H01R12/70—Coupling devices
  • H01R12/77—Coupling devices for flexible printed circuits, flat or ribbon cables or like structures
  • H01R12/771—Details
  • H01R12/775—Ground or shield arrangements

Definitions

• This invention relates to a connector for a flat cable, and in particular, to a connector for high-speed signal transmission cables.
• signal lead lines 91, 93, 95, 97 of a cable portion 110 are disposed between grounding lead lines 90 and 92; 92 and 94; 94 and 96; 96 and 98; respectively.
• These signal lead lines are connected with pad portions 84, 85, which are connected with tail portions 81, 82 arranged on one of two surfaces of a substrate 100, while the above-mentioned grounding lead lines 90, 92, 94, 96, 98 are connected with a common grounding plate 120, which is connected with a tail portion 80 arranged on the other one of the two surfaces of the substrate 100 (refer to Fig. 8) .
• the signal lead lines 91, 93, 95 are arranged in parallel with each other at small intervals as shown in Fig. 8. Therefore, there rises a problem that cross-talks are caused among these signal lead lines.
• the purpose of the present invention is to solve the above-mentioned problem of the prior art connector and to provide a connector for high-speed signal transmission cables which has a simple structure and suffers very little cross-talk.
• the connector of the present invention for high-speed signal transmission cables, comprises first pad portions connected to signal connection terminals and second pad portions connected to grounding connection terminals.
• the first pad portions and the second pad portions are spaced and arranged alternatingly on each of two surfaces of a substrate so that the position of any of the first pad portions on one of the two surfaces of the substrate is substantially aligned with the position of one of the second pad portions on the other of the two surfaces of the substrate.
• a connector for high-speed signal transmission cables comprises a cable portion having signal lead lines and grounding lead lines; and a common grounding plate disposed substantially at the end of the cable.
• the signal lead lines and the grounding lead lines are connected respectively to the first pad portions and the common grounding plate.
• the common grounding plate has an extension connected to the second pad portion.
• FIG. 1 is a partly sectional plan view of a connector according to a first embodiment of the present invention
• Fig. 2 is a side view of a part of the connector shown in Fig. 1
• Fig. 3 is a partly sectional plan view of a connector according to a second embodiment of the present invention
• Fig. 4 is a side view of a part of the connector shown in Fig. 3
• Fig. 5 is a sectional view taken on line A-A of
• Fig. 6 is a sectional view taken on line B-B of Fig. 3,
• Fig. 7 is a partly sectional plan view of a connector of a prior art
• Fig. 8 is a sectional view taken on line C-C of Fig. 7. Detailed Description of Several Presently Preferred Embodiments
• Fig. 1 is a plan view partly in section of the first embodiment, in which an insulation cover portion 13 covering a region from conductive tail portions 18, 19, 20 to the tip portion of a cable portion 14 is removed.
• a plurality of conductive connection terminals 15, 16, 17 are, for example, disposed inside of an insulation cover portion 11 made of synthetic resin such as PTFE.
• the tail portions 18, 19, 20 are arranged on a substrate 12 fixed to the insulation cover portion 11 separately from each other at substantially equal intervals, and are connected with the connection terminals 15, 16, 17, respectively.
• the tail portions have first pad portions 22, 24 and second pad portions 21, 23, 25, these pad portions being connected with lead lines 1 - 10 of the cable portion 14, respectively.
• These pad portions are also made of conductive material, and are arranged on the substrate 12 separately from each other at substantially equal intervals.
• Each of the above-mentioned signal lead lines of the cable portion 14 are, similarly in prior art, adapted to be put between grounding lead lines, for example, the signal lead line 8 is disposed between the grounding lead lines 7, 9.
• the most leftward lead line 1 is used for grounding, and a group of the three lead lines.2, 3, 3 is arranged on the lower surface of the substrate 12 rightwards adjacent to the lead line 1 and connected with the respective pads on the substrate.
• next group of the three lead lines 4, 5, 5 extend on the upper surface of the substrate and are connected with the pad portions 22, 23, on the substrate, respectively.
• the most leftward lead line 4 of the group of three lines is a signal lead line and the remaining two lines 5, 5 are grounding lead lines.
• the grounding lead lines 5, 5 are arranged so as to lie upon the pad portion 23 (second pad portion) and connected the pad portion 23, which is connected with the grounding tail portion 18 through a connection portion 21.
• the other grounding lead lines 9 , 9 are also connected with the grounding tail portion 18 through the pad portion 25 (second pad portion) and the connection portion 26.
• Fig. 2 is a side view showing a region near the tip portions of the pad portion and the cable portion on the substrate.
• Fig. 3 shows a second embodiment of the present invention, which uses a common grounding plate 35.
• the insulation cover portion 31, the connection terminals (not shown), the conductive tail portions 36, 37, 38, the conductive first pad portion 41, 43, the conductive second pad portions 40, 42, 44, the substrate 32, and the cable portions 34 have the same structures as in the first embodiment, and the insulation cover 33 is removed.
• the above-mentioned grounding plate 35 is located near the front edge portion of the cable portion 34, and connected with the same.
• the grounding lead lines 52, 55, 57, 59 of the cable portion 34 are bent as being grouped into pairs of lines, and are connected with the grounding plate 35.
• the signal lead lines 53, 58 of the cable portion are placed upon and are connected with the first pad portions 41, 43, which are connected with the signal tail portions 37, 38, respectively.
• paired grounding lead lines 55 and 59 are bent to place every other pair towards the lower surface of the substrate and they are connected with a second common grounding plate 35 (not shown) .
• Extensions 70 extending from the common grounding plate 35 are placed upon and connected with the second pad portions 40, 42, 44, which are connected with the grounding tail portion 36 through a connection portion 39.
• grounding extensions extending from the grounding plate 35 At positions located on the surface of the substrate opposite to that for the signal lead lines 53, 58 of the cable portion 34 and corresponding to the positions of these signal lines are arranged grounding extensions extending from the grounding plate 35, which extensions are connected with the second pad portions. Referring to Fig. 4, the extensions 70 extending from the grounding plate 35, are placed upon and connected with the lead line 51 (56 and 60 are not shown) extending from the cable portion 34.
• a conventional connector for high-speed signal transmission cables as shown in Fig. 8, on one surface of a substrate 100 are arranged signal lead lines at substantially equal intervals, while on the other surface are arranged grounding lead lines.
• pad portions 83, 84, 85 On the upper surface of the substrate 40 are arranged pad portions 83, 84, 85 each having a breadth "p", to which are connected signal lead lines 91, 93, 95. Namely, the interval between the signal lead lines is "p.
• a connector according to the present invention as shown in Figs. 5 and 6 corresponding to embodiments of the present invention, on one surface of the substrate are alternatively arranged signal lead lines and grounding lead lines, and on the other surface of the substrate are arranged signal lead lines oppositely to the grounding lead lines on the one surface, while grounding lead lines are arranged oppositely to the signal lead lines on the one surface.
• the substrate thickness as "t”
• the distance between adjacent signal lead lines is (p 2 + t 2 ) 1/2
• the ratio of cross-talk noise N in the prior art to that in the present invention is (P/(P 2 + t 2 ) /2
• the present invention provides a connector for high-speed signal transmission cables having a very simple structure and decreased cross-talk noises.
• each of the lead lines connected to the signal pad portions is surrounded along the longitudinal direction thereof by lead lines connected to the grounding pad portions.

Landscapes

• Details Of Connecting Devices For Male And Female Coupling (AREA)
• Multi-Conductor Connections (AREA)

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Publications (1)

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ID=13998795

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Cited By (8)

Families Citing this family (3)

Citations (5)

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• 1990
  • 1990-08-29 JP JP1990090444U patent/JPH0810932Y2/ja not_active Expired - Fee Related
• 1991
  • 1991-08-19 WO PCT/US1991/005931 patent/WO1992004745A1/en active Search and Examination
  • 1991-08-29 CN CN91109293A patent/CN1060369A/zh active Pending

Patent Citations (5)

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