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Inverted Excitation coil for HID lamps

  • US 4,894,591 A
  • Filed: 09/06/1988
  • Issued: 01/16/1990
  • Est. Priority Date: 09/06/1988
  • Status: Expired due to Fees
First Claim
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1. An excitation coil, adaptable for use with an arc tube in an electrodeless high-intensity-discharge (HID) lamp, comprising:

  • first and second solenoidal portions of coiled conductor, each with an axis substantially aligned with the axis of the other portion, each wound in a common direction to produce, responsive to a signal current flowing in the same direction through both portions, a magnetic field adding in-phase to the magnetic field of the other portion, and each with a first end located nearest to a central volume in which said arc tube can be positioned and a second end located further from the other portion than the first end; and

    another conductive portion connecting the two second ends to one another;

    the pair of first ends being adapted to receive a radio-frequency signal of characteristics selected to cause said coil to start and maintain a plasma arc discharge in said arc tube.

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