Printed circuit having twisted conductor lines printed thereon

• US 5,039,824 A
• Filed: 05/18/1990
• Issued: 08/13/1991
• Est. Priority Date: 05/30/1989
• Status: Expired due to Fees

• Current Assignee: Graphico Co., Ltd.
• Original Assignee: Graphico Co., Ltd.
• Inventors: Takashima, Rihei, Takashima, Tokuhei
• Primary Examiner(s): Askin, Laramie E.
• Application Number:
  US07/525,065
• Time in Patent Office: 452 Days
• Field of Search: 174/32, 174/33, 174/34, 174/117 FF, 174/261, 174/262, 174/266, 174/268, 333/1, 333/99 R, 333/4, 333/5, 333/12, 361/414, 361/397, 361/409, 361/410
• US Class Current: 174/33
• CPC Class Codes: H05K 1/0228 Compensation of cross-talk by a mutually correlated lay-out of printed circuit traces, e.g. for compensation of cross-talk in mounted connectors balanced signal pairs H05K1/0245
• CPC Class Codes: H05K 1/0245 Lay-out of balanced signal pairs, e.g. differential lines or twisted lines
• CPC Class Codes: H05K 2201/097 Alternating conductors, e.g. alternating different shaped pads, twisted pairs; Alternating components
• CPC Class Codes: H05K 3/4611 by laminating two or more circuit boards H05K3/4652 takes precedence
• CPC Class Codes: H05K 9/0039 Galvanic coupling of ground layer on printed circuit board [PCB] to conductive casing printed shielding conductors, ground planes or power planes for reduction of cross-talk or noise in printed circuits H05K1/0218

Abstract

A printed conductor including two twisted conductor lines each have a plurality of segments disposed alternately on opposite surfaces of a circuit board, the successive segments of each line being connected by electrically conductive elements passing through through-holes in the circuit board. The use of such printed conductor improves the transmission characteristics of the printed circuit in the high-frequency range.

Claims

1. A printed circuit comprising:

a substrate having first and second ends;

a plurality of through-holes formed through said substrate in a predetermined pattern between said first and second ends, said plurality of through-holes including a pair of through-holes positioned adjacent each end of said substrate for access to terminals of a signal source and a load respectively, remaining ones of said plurality of through-holes being linearly arranged in a longitudinal direction of said substrate and between said pairs of through-holes; and

a plurality of conductive segments disposed alternately on opposite surfaces of said substrate and connected by electricity conductive means passing through each of said plurality of through-holes, said plurality of segments including a first straight segment on one side of the substrate connected to one of the pair of through-holes at the first end of the substrate and to the nearest linearly arranged through-hole, and a second straight segment on the opposite side of the substrate connected to the nearest linearly arranged through-hole, and a second straight segment on the opposite side of the substrate connected to one of the pair of through-holes at the second end of the substrate and to the nearest linearly arranged through-hole, the remaining ones of said plurality of conductive segments being of an arcuate shape and connected such that a first s-shaped pattern is obtained between the other of the pair of through-holes at the first end of the substrate and the straight segment at the second end of the substrate, and a second s-shaped pattern is obtained between the other of the pair of through-holes at the second end of the substrate and the straight segment at the first end of the substrate.

2. The printed circuit according to claim 1, wherein opposing ends of each of said plurality of arcuate segments are connected to every other one of said plurality of through-holes.

3. The printed circuit according to claim 1, wherein said electrically conductive means comprises plating in each of said plurality of through-holes.