Lamp holding fixture for chemical vapor deposition

A holding fixture for holding at least one electric lamp for coating in a deposition chamber during chemical vapor deposition, said electric lamp comprising a light-transmissive envelope having an outside surface on which said coating will be deposited, at least one end having means for sealing said lamp, and two lead-in wires protruding from said lamp envelope, said holding fixture comprising:

• (a) first and second spaced-apart sufficiently rigid wire-mesh screens, said first screen being adapted to receive a first portion of said lamp, said second screen being adapted to receive a second portion of said lamp, such that when properly spaced apart both of said screens retain said lamp in a fixed position with respect to said holding fixture;
• (b) means for spacing apart said first and second wire-mesh screens such that said first screen is substantially parallel to said second screen, said first screen may receive said first portion of said lamp, said second screen may receive said second portion of said lamp, and said spacing-apart means do not substantially restrict the free flow of chemical vapor within said deposition chamber parallel to said screens;
• and
• (c) said first and second screens and said means for spacing apart said first and second screens are fabricated from materials which are capable of withstanding the high ambient temperatures occurring during said chemical vapor deposition, which will not react with the chemicals of said chemical vapor deposition, and which will not contaminate said chemical vapor deposition.