H - Electricity – 01 – J
Patent
H - Electricity
01
J
313/85
H01J 61/35 (2006.01) H01K 1/32 (2006.01) H01K 7/00 (2006.01)
Patent
CA 1184235
24 ABSTRACT: An electric reflector lamp according to the invention has a blown lamp envelope comprising a concave internally mirror-coated wall portion, a spherical inter- nally 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 single blow moulding. The axes of the mirror-coated wall portions coincide, just like their focus and centre 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 reflection through the translucent wall portion to the exterior, surround the focus through a solid angle of more than 1.5 .pi. .theta.r. The spherical wall portion constitutes a mask which prevents light rays from the light source from reaching the translucent wall por- tion other than after reflection. The lamp does not emit stray light and very effectively concentrates the radiated light.
401051
Giller Henricus F.j.i.
Roelevink Bauke J.
Van Hees Antonius J.m.
N.v. Philips Gloeilampenfabrieken
Roelevink Bauke J.
Van Hees Antonius J. M.
Van Steinburg C.e.
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