Optical filters comprising pyrolyzed polyimide films and lamp

Details Optical filters comprising pyrolyzed polyimide films and lamp Optical filters comprising pyrolyzed polyimide films and lamp

1981-06-22

1984-01-10

Moore, David K.

Electric lamp and discharge devices

With optical device or special ray transmissive envelope

Polarizer or special ray transmission

H01J 6140

Patent

active

044255276

ABSTRACT:
Selective optical absorption filters which transmit infrared light and absorb or partially reflect visible light comprise thin films of partially pyrolyzed polymeric aromatic pyromellitimides. The filters are characterized by a metallic luster and maximum light transmittance above about 2 .mu.m wavelength.
A lamp is disclosed having a reflective filter disposed behind the filament to reflect visible light forward through the front portion of the lamp while transmitting infrared light rearward through the back portion of the lamp.

REFERENCES:
patent: 2834689 (1958-05-01), Jupnik
patent: 3179634 (1965-04-01), Edwards
patent: 3253504 (1966-05-01), Vollmer
Journal of Applied Physics; "The Optical Properties of Kapton:Measurement and Applications", Arakawa et al.; May 1981, vol. 52, No. 5, pp. 3579-3582.
Journal of Polymer Science; "The Nature of Dielectric Losses in H-Film", Wrasidlo; Nov. 1973, vol. 11, No. 11, pp. 2143-2152.

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