Method and cable for connecting electronic equipment to another electronic equipment

• US 6,395,977 B1
• Filed: 07/21/1999
• Issued: 05/28/2002
• Est. Priority Date: 01/30/1997
• Status: Expired due to Fees

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Yamamoto, Takashi
• Primary Examiner(s): Reichard, Dean A.
• Assistant Examiner(s): Mayo, III, William H.
• Application Number:
  US09/341,961
• Time in Patent Office: 1,042 Days
• Field of Search: 174/36,78,102 R,74 R,75 C,84 R,88 C
• US Class Current: 174/36
• CPC Class Codes: H01R 2103/00 Two poles
• CPC Class Codes: H01R 24/44 comprising impedance matching means

Abstract

A connection method and a connecting cable for improving transmission of low-frequency signals and reducing the radiation level of high-frequency signals. To connect electronic devices via a connecting cable, the region between the ends of the signal line of a connecting cable is shielded by a first external conductor. Then one end of the first external conductor is connected to a reference potential of a first electronic device. The first external conductor is shielded by a second external conductor, and the second external conductor is connected to a reference potential of a second electronic device. The reference potentials of the first and reference potentials of the second electronic devices are coupled through a stray capacity between the first external conductor and the second external conductor. The length of opposition between the first and second external conductors is adjusted according to a frequency for suppressing radiation.

Claims

1. A method for connecting electronic devices comprising:

providing a plurality of cables each having at least two ends;

shielding signal lines of the plurality of connecting cables between the ends thereof by first external conductors, respectively;

connecting one end of the first external conductors to a reference potential of at least one first electronic device, and electrically connecting the other ends of the first external conductors to each other;

shielding said first external conductors by a common second external conductor;

connecting the second external conductor to a reference potential of a second electronic device,

electrically connecting the other ends of the first external conductors to each other, and covering said first external conductors by a third external conductor which contacts the outside of a bundle of the first external conductors of the plurality of connecting cables so as to oppose the second external conductor; and

coupling the reference potential of the first and second electronic devices through a stray capacity between the second and third external conductors.

2. A method for connecting electronic devices as set forth in claim 1, wherein the length of opposition between the second and third external conductors is adjusted according to a frequency for suppressing radiation.

3. A method for connecting electronic devices as set forth in claim 1, wherein the adjustment is performed by connecting, between the second and third external conductors, a capacitor element having a capacitance corresponding to the frequency for suppressing radiation.

4. A method for connecting electronic devices as set forth in claim 1, wherein at least one of the second and third external conductors is a braided wire.

5. A method for connecting electronic devices as set forth in claim 1, wherein a sheet comprising inner first and outer second conductor sheets opposing each other through an insulation film winds around the connecting cable, wherein the inner first conductor sheet forms the third external conductor and the outer second conductor sheet forms the second external conductor, whereby the reference potential of the first and second electronic devices are coupled through the stray capacity between the inner first and outer second conductor sheets.