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IMPROVED FABRICATION TECHNIQUE FOR NARROW APERTURE FLUORESCENT LAMPS

IP.com Disclosure Number: IPCOM000026369D
Original Publication Date: 1991-Aug-31
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 60K

Publishing Venue

Xerox Disclosure Journal

Abstract

Narrow slit aperture fluorescent lamps are presently manufactured by mechanically scraping the phosphor in that area where the slit is desired. Slits of 5 degrees are presently state-of-the-art for T8 (1 inch diameter) lamps.

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XEROX DISCLOSURE JOURNAL

IMPROVED FABRICATION TECHNIQUE FOR NARROW APERTURE FLUORESCENT LAMPS
Heiko Rommelmann

Proposed Classification
U.S. C1.355/200 Int. C1. G03g 15/00

Narrow slit aperture fluorescent lamps are presently manufactured by mechanically scraping the phosphor in that area where the slit is desired. Slits of 5 degrees are presently state-of-the-art for T8 (1 inch diameter) lamps.

Prior to coating of the inside of the lamp tube, a thin strip of material is positioned in the area where the slit is desired. Subsequent to the coating process, the material may be removed, leaving a clear aperture. This material may, for example, be pressure sensitive adhesive tape strips which for a T8 lamp would need to be of width around 43 mils. The strip could be positioned by electrostatically holding the strip to a mandrel and then using the mandrel to supply the required pressure.

Use of this technique is substantially less labor and equipment intensive than presently used mechanical scraping techniques. Strips of pressure sensitive tape are readily available at widths even thinner than that cited above, thereby permitting fabrication of narrower slits and/or equal width slits in smaller diameter tubes. Finally, apertures of comparatively complicated geometries could easily be made by this technique if desired.

XEROX DISCLOSURE JOURNAL - Vol. 16, No. 4 July/August 1991 245

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246 XEROX DISCLOSURE JOU...