Electricity: electrical systems and devices – Safety and protection of systems and devices – Motor protective condition responsive circuits
Patent
1998-04-08
2000-10-17
O'Shea, Sandra
Electricity: electrical systems and devices
Safety and protection of systems and devices
Motor protective condition responsive circuits
361800, F21V 704
Patent
active
061340928
ABSTRACT:
An illumination device comprises a waveguide having a peripheral edge. A series of point light sources are mounted in spaced relationship adjacent a peripheral portion of the waveguide. A series of diffusive reflective surfaces, preferably formed by posts, are disposed adjacent the peripheral portion of the waveguide, between pairs of the point light sources. The diffusive reflective surfaces are oriented relative to the series of point light sources and the waveguide so as to introduce light into regions of the waveguide between pairs of the point light sources, whereby the peripheral portion of the waveguide is substantially uniformly illuminated.
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3M Optical Systems, Brightness Enhancement Film (BEF), 2 pgs., 1993.
Dowland, Jr. Thomas W.
Pelka David G.
Popovich John M.
O'shea Sandra
Sawhney Hargobind S.
Teledyne Lighting and Display Products, Inc.
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