Reflector lamp with reduced seal temperature
View Patent ↗A lamp assembly 10 has a light source 12 having two sealed electrodes 14, 16 , sealed in a seal area 17 and defining a lamp axis 18 . A concave shell 20 has an internal surface 22 with a reflective surface 23 formed thereon. The concave shell 20 has a neck 24 defining a neck cavity 26 and a reflector axis 28 . The neck 24 is provided with an electrical connection 30 and a mechanical support for the light source 12 . The shell 20 surrounds the source 12 to reflect light from the source 12 to a field to be illuminated during lamp operation. The source 12 and the reflector surface 23 are oriented with the lamp axis 18 substantially co-axial with the reflector axis 28 , and at least a portion of at least one of the electrodes, for example, 14 , extends into the neck cavity 26 . A zone 32 is formed in the neck cavity 26 for substantially redirecting specular reflection away from the seal area.
1. A lamp assembly comprising:
a light source including a capsule having two sealed electrodes sealed in a seal area and defining a lamp axis, said capsule being sealed in a light transmissive jacket;
a concave shell having an internal surface with a reflective surface formed thereon, said shell having a neck defining a neck cavity with an open bottom and a reflector axis, said jacket being provided with an electrical connection and a mechanical support for said light source;
said shell surrounding said source to reflect light from said source to a field to be illuminated during lamp operation, said source and said reflector being oriented with said lamp axis to be substantially co-axial with said reflector axis, and at least a portion of at least one of said electrodes extending in said neck cavity; and
a zone formed in said neck cavity for substantially redirecting specular reflection away from said seal area, said zone terminating adjacent said open bottom, and an end of said light transmissive jacket being positioned in said open bottom.
2. The lamp assembly of claim 1 wherein said zone comprises a plurality of facets arrayed about the surface of neck cavity.
3. The lamp assembly of claim 1 wherein said zone comprises a stippled pattern arrayed about the surface of said neck cavity.
4. The lamp assembly of claim 1 wherein said zone comprises a plurality of closely spaced longitudinal grooves arrayed about the surface of said neck cavity.