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Device for applying particular voltage waveform for operating a discharge lamp

  • US 5,977,722 A
  • Filed: 11/17/1997
  • Issued: 11/02/1999
  • Est. Priority Date: 01/16/1996
  • Status: Expired due to Term
First Claim
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1. Device for operating a fluorescent discharge lamp of the outer electrode type in which at least one of rare gases He, Ne, Ar, Kr, and Xe is hermetically sealed in within a glass tube and in which a fluorescent material is applied to an inner side of the glass tube, and in which at least two strip-shaped electrodes extend along an outer side of the glass tube in an axial direction thereof, comprising means for applying a lamp voltage to the electrodes which has a periodic voltage waveform with a single maximum peak value within a repetition period that is greater than twice the width of the waveform at a voltage of 0 V, wherein a half-value width W of said single maximum peak value is set to a predetermined value in the range of 10 μ

  • s≦

    t≦

    30 μ

    s.

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