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Airbag deployment monitor and sensing electronics

  • US 6,894,483 B2
  • Filed: 05/14/2004
  • Issued: 05/17/2005
  • Est. Priority Date: 03/07/2003
  • Status: Expired due to Fees
First Claim
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1. An airbag deployment monitor comprising:

  • a cartridge containing a length of tape, the tape having a first end attached to an inside surface of an airbag cushion, wherein the tape has first portions which conduct electricity, and second portions which are substantially non-conductive, and wherein the first portions alternate with second portions, the cartridge having a magnet assembled therewith;

    a magnetic field sensor mounted in the cartridge spaced from the magnet so that as the tape is drawn from the cartridge the tape is positioned to move between the magnet and a magnetic field sensor, and the first conductive portions contain a magnetically impermeable material to block magnetic field lines, and withdrawal of the tape from the cartridge produces a time varying output from the magnetic field sensor.

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