Electric lamp and discharge devices – With optical device or special ray transmissive envelope – Polarizer or special ray transmission
Patent
1995-03-13
1996-11-26
Patel, Nimeshkumar
Electric lamp and discharge devices
With optical device or special ray transmissive envelope
Polarizer or special ray transmission
313116, 313635, H01K 132
Patent
active
055788920
ABSTRACT:
An electric lamp is provided having a quartz envelope and a light source capable of generating light within the envelope. Disposed on a surface of the envelope is a filter which absorbs a portion of the light emitted by the light source to produce light output poorly seen by insects. The filter includes a blue absorbing pigment in a vitreous glassy silica binder derived from a coating precursor comprising a liquid dispersion of colloidal silica in a silicone. The blue absorbing pigment is preferably a praseodymium doped zircon or an antimony doped nickel titanate. Preferably, the filter also includes a precoat of ultra-fine titania to improve the reduction of ultraviolet radiation.
REFERENCES:
patent: 4171227 (1979-10-01), Derolf et al.
patent: 4633127 (1986-12-01), Beurskens et al.
patent: 5107167 (1992-04-01), Shobert et al.
patent: 5118985 (1992-06-01), Patton et al.
patent: 5177385 (1993-01-01), Reisman
Parham Thomas G.
Whitman Pamela K.
General Electric Company
Hawranko George E.
Patel Nimeshkumar
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