Electric lamp and discharge devices – With optical device or special ray transmissive envelope – Polarizer or special ray transmission
Patent
1995-03-23
1996-10-29
O'Shea, Sandra L.
Electric lamp and discharge devices
With optical device or special ray transmissive envelope
Polarizer or special ray transmission
313635, 359339, H01J 6140
Patent
active
055699707
ABSTRACT:
An optical interference filter produced on a vitreous, light transmissive substrate, such as an electric lamp envelope, includes a plurality of alternating layers of tantala and silica in which each tantala layer includes titania in an amount of less than about 10 mole % whereby the microstructure of the tantala layers is controlled during subsequent crystallization and extrinsic stress in the tantala layers is reduced. Rather than or in addition to including titania in each tantala layer, the present invention additionally contemplates placing at least some of the tantala layers in contact with a titania layer (pre-layer and/or post-layer) whereby the microstructure of the tantala layers is controlled during subsequent crystallization and extrinsic stress in the tantala layers is reduced. The optical interference filters are produced by a process comprising depositing a plurality of alternating layers of tantala and silica on a vitreous, light transmissive substrate from respective precursors thereof by CVD, preferably LPCVD, to form a coated substrate. The filter may then be heated for a time and to a temperature effective to crystallize the tantala, preferably to a temperature ranging from about 550.degree. to about 800.degree. C. and holding same within that temperature range for at least about one hour.
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Dynys Frederick W.
Parham Thomas G.
Corwin Stanley C.
General Electric Company
Hawranko George E.
O'Shea Sandra L.
Patel Vip
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