Lamp unit having accurately positioned filament

Claim 1

A lamp unit comprising a light bulb secured to a base, said light bulb comprising a sealed envelope with a pinch seal enclosing a light source and having lead-in wires extending externally of the envelope, and said base comprising a tubular lamp holder member having an end thereof positioned against a flat surface of a bottom member, said tubular lamp holder member being provided with lamp alignment and support means slidable in the lamp holder member and frictionally engaging the light bulb for alignment with respect to said lamp holder member, said bottom member being provided with openings for receiving said lead-in wires of the light bulb, said light bulb being positioned to extend at least partly into said tubular lamp holder member with its lead-in wires extending into or through said openings, means attaching said lead-in wires to said bottom member, and means attaching said tubular lamp holder member to said bottom member, whereby prior to said attachments said light bulb is longitudinally movable in said base, and said light bulb and tubular lamp holder member are laterally and rotatably movable with respect to said bottom member, thereby permitting accurate alignment of said light source with respect to said bottom member.