Patterned optical interference coatings for only a portion of a

Details Patterned optical interference coatings for only a portion of a Patterned optical interference coatings for only a portion of a

1995-12-27

1996-12-24

Gross, Anita Pellman

Electric lamp and discharge devices

With gas or vapor

Envelope with particular structure

313635, 359584, 362255, H01J 1716, H01J 6130, G02B 110, F21M 314

Patent

active

055876269

ABSTRACT:
An interference filter or coating is provided in a predetermined pattern on a lamp envelope. The coating is comprised of alternating layers of high and low index of refraction materials applied to a vitreous outer surface of a lamp envelope. The coating may be geometrically symmetric or asymmetric, continuous or discontinuous with respect to the coating itself or the envelope to which it has been applied. The envelope can be masked prior to deposition of the coating so that removal of the mask leaves the filter in the desired pattern. The preferred process for forming the coating includes forming a boric oxide mask on a portion of the envelope, applying the coating over the mask and removing the coating from masked areas of the envelope by dissolving the mask in an aqueous solution.

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