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Metal halide gas discharge lamp for projection purposes

  • US 5,689,154 A
  • Filed: 05/30/1996
  • Issued: 11/18/1997
  • Est. Priority Date: 01/28/1994
  • Status: Expired due to Fees
First Claim
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1. A metal halide gas discharge lamp (1) for projection purposes, having a translucent discharge vessel (2) closed on two ends (3);

  • an ionizable fill within the vessel;

    two opposed electrodes (4) in the vessel, separated by an interelectrode gap, connected to power supply leads (8) carried to the outside; and

    a frosting forming a strip-like portion (14) on the circumference of the outer surface of the discharge vessel (2),characterized in thatthe frosted portion (14) is located in alignment with the interelectrode gap, and has a width which is less than or at most equal to the electrode spacing defining said interelectrode gap; and

    regions of clear surface of said vessel (2) adjoin each of the edges of the strip-like portion of the frosted outer surface.

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