Incandescent projection lamp having a prealigned proximity reflector and filament mount assembly

Claim 1

In an incandescent projection lamp having a tubular envelope and a vitreous stem that is joined to one end of said envelope, an improved filament mount-and-proximity reflector assembly comprising: a first rigid lead-in conductor that is sealed through said stem and extends longitudinally into said envelope, the medial portion of said first lead-in conductor being offset from the longitudinal axis of said envelope and terminating in a lateral arm segment that is disposed toward said axis and is located in a predetermined plane that extends longitudinally of said envelope, a second rigid lead-in conductor sealed through said stem and extending longitudinally into said envelope a shorter distance than said first lead-in conductor, said second lead-in conductor terminating in a retroverted necked segment that extends transversely to one side of said predetermined plane and has its free end located at said plane, a rigid spud wire anchored in said stem and extending longitudinally between said first and second lead-in conductors, said spud-wire being insulated from both of said lead-in conductors by said stem and having its free end aligned with said plane, a rigid auxiliary conductor having (a) a first laterally extending segment that is located in said plane, is fastened to the free end of said spud wire and extends therebeyond toward said first lead-in conductor and past the necked segment of said second lead-in conductor toward a wall of said envelope, (b) a medial portion that longitudinally extends along and is offset from the axis of said envelope, and (c) a second laterally extending segment that extends toward but is spaced from the arm segment of said first lead-in conductor and is also located in said plane, a first linear filament having one end attached to the arm segment of said first lead-in conductor and its opposite end attached to the free end of said first laterally extending segment of said auxiliary conductor, a second linear filament having one end attached to the end of the necked segment of said second lead-in conductor and its opposite end attached to the second laterally extending segment of said auxiliary conductor, said first and second linear filaments being connected in series and suspended in spaced side-by-side relationship in said predetermined plane between the offset portions of said first lead-in conductor and said auxiliary conductor, a concave reflector of refractory metal positioned proximate said plane with its concave surface facing toward said first and second filaments, and a rigid support member fastened to said reflector and to said auxiliary conductor and suspending said reflector in the aforesaid position.