Shield wire

• US 4,059,724 A
• Filed: 03/15/1976
• Issued: 11/22/1977
• Est. Priority Date: 03/22/1975
• Status: Expired due to Term

• Current Assignee: Homare Ide
• Original Assignee: Homare Ide
• Inventors: Ide, Homare
• Primary Examiner(s): Grimley, Arthur T.
• Application Number:
  US05/667,032
• Time in Patent Office: 617 Days
• Field of Search: 174/36, 174/102 R, 174/102 SC, 174/105 SC, 174/107, 174/120 SC
• US Class Current: 174/36
• CPC Class Codes: H01B 11/1058 using a coating, e.g. a loaded polymer, ink or print
• CPC Class Codes: H01B 7/0275 comprising one or more extruded layers of insulation

Abstract

A shield wire includes an inner conductor, a first dielectric surrounding the inner conductor, a second dielectric of Japanese paper placed over the first dielectric, a middle conductor relatively high in resistance placed over the second dielectric, a braid of copper alloy woven over the middle conductor to form an outer conductor, and a covering of elastic dielectric placed on top of said braid, thereby to prevent not only the influence of induction hum due to external magnetic fields but also the generation of noise signals due to bending of a shield wire.

Claims

1. A shield wire comprising:

an inner conductor of metal;

a first dielectric surrounding said inner conductor;

a second dielectric placed on top of said first dielectric;

a middle conductor formed of a mixture of carbon powder and plastic and having a relatively high resistance placed over said second dielectric;

a braid of metal woven over said middle conductor to form an outer conductor; and

a covering of electric dielectric placed on top of said braid.

2. A shield wire as claimed in claim 1 wherein said second dielectric is a Japanese paper wrapped over said first dielectric.

3. A shield wire as claimed in claim 1 wherein said second dielectric is a cellophane surrounding said first dielectric.

4. A shield wire as claimed in claim 1 wherein said second dielectric is cotton tape placed over said first dielectric.

5. A shield wire as claimed in claim 1, wherein said second dielectric is cotton thread wound on said first dielectric.