The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 19, 1985
Filed:
Apr. 12, 1982
Henricus F Giller, Eindhoven, NL;
Antonius J van Hees, Eindhoven, NL;
Bauke J Roelevink, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
An electric reflector lamp according to the invention has a blown lamp envelope comprising a concave internally mirror-coated wall portion, a spherical internally mirror-coated wall portion opposite thereto, an annular translucent wall portion between the first two portions and a tubular wall portion at the apex of the concave wall portion. These wall portions constitute a single blow moulding. The axes of the mirror-coated wall portions coincide, just like their focus and center of curvature, around which a light source is arranged. The concave wall portion is parabolic or elliptic, the second focus lying outside the lamp envelope. The parts of the mirror-coated wall portions, which throw light rays after at most two reflections through the translucent wall portion to the exterior, surround the focus through a solid angle of more than 1.5 .pi.sr. The spherical wall portion constitutes a mask which prevents light rays from the light source from reaching the translucent wall portion other than after reflection. The lamp does not emit stray light and very effectively concentrates the radiated light.