Browse Prior Art Database

Thin Wire Shielded Ignition System

IP.com Disclosure Number: IPCOM000096085D
Original Publication Date: 1964-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Schroeder, CE: AUTHOR

Abstract

The ignition systems of power plants of mobile units for computers can cause interference of sufficient magnitude to disrupt operations of the computer circuitry. Proper operations are realized when the ignition systems are adequately shielded.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Thin Wire Shielded Ignition System

The ignition systems of power plants of mobile units for computers can cause interference of sufficient magnitude to disrupt operations of the computer circuitry. Proper operations are realized when the ignition systems are adequately shielded.

This type of shielded ignition system has greatly reduced loss through shield capacitance in comparison to conventional shielded ignition systems. A thin wire 2 of three to five mils diameter, preferably of steel or other high tensile material, is passed through a number of loosely nested plastic or rubber tubes 3, 4, and 5. All of these are encased within an outer shield 6 of copper braided wire.

The capacitance between wire 2 and shield 6 is much less than that between the conventional fifty mil wire and a shield 6. The additional air gaps 7 between the tubes and wire and shield further reduce the capacitance due to the decreased net dielectric constant despite the slight capacitive increase due to eccentricity.

Since the ignition current is mostly at a high frequency, the reduction of conductor to shield capacitance in this system substantially increases the current available at the spark plugs.

1

Page 2 of 2

2

[This page contains 2 pictures or other non-text objects]