Method of coating lamp envelope with heat reflecting filter

Details Method of coating lamp envelope with heat reflecting filter Method of coating lamp envelope with heat reflecting filter

1976-11-24

1977-09-13

Hoffman, James R.

Coating processes

Measuring, testing, or indicating

Thickness or uniformity of thickness determined

427 8, B05D 506, B05D 136

Patent

active

040483479

ABSTRACT:
A dichroic coating is deposited on a cylindrical lamp envelope from an evaporation source while the envelope is heated and rotated. The thickness of the coating is monitored by measuring the intensity of light beamed on and reflected from a flat plate in line of sight with the evaporation source.

REFERENCES:
patent: 2784115 (1957-03-01), Brinsmaid et al.
patent: 2920002 (1960-01-01), Auwarter
patent: 3188513 (1965-06-01), Hansler
patent: 3225243 (1965-12-01), Dauser
patent: 3637294 (1972-01-01), Berthold
patent: 3650815 (1972-03-01), Ghoshtagore et al.
patent: 3752691 (1973-08-01), Little
patent: 3926508 (1975-12-01), Harmsen et al.

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