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Reprographic metal halide lamps having long life and maintenance

  • US 5,013,968 A
  • Filed: 03/10/1989
  • Issued: 05/07/1991
  • Est. Priority Date: 03/10/1989
  • Status: Expired due to Term
First Claim
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1. A metal halide arc discharge lamp emitting primarily in the blue, green and red portions of the visible light spectrum and not continuously across the visible spectrum and with at least a portion of the blue emission at a wavelength of about 450 nm, said lamp comprising a light transmissive, vitreous, hermetically sealed arc chamber enclosing a pair of electrodes therein which protrude into said arc chamber, said arm chamber further containing mercury, an inert gas, at least one halogen, zinc, indium, lithium, thallium, and at least one rare earth metal, wherein the amount of indium present is no greater than about 25 mole % of the total of said indium, lithium and thallium and wherein said at least one halogen is present in an amount sufficient to insure that at least said indium, lithium, thallium and at least a portion of said zinc are present as metal halides during operation of said lamp, but not in excess of that amount required for said indium, lithium, thallium, zinc and rear earth metal to be present as metal halide during operation of said lamp.

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