Patent ID: 6404112
Filing Date: 2002-06-11
Classification: H01J,H01K,Y02B

Abstract:
An electric lamp/reflector unit comprising:a reflector body (1) including a reflector portion (2) having a concave reflecting surface (3) with an optical axis (4) and, integral therewith, a hollow neck-shaped portion (5) about the optical axis (4), and an electric lamp (10) provided with a gastight light-transmitting lamp vessel (11), and comprising a quartz-glass wall (12) which encloses a cavity (13) of a predetermined, in general, spherical or elliptic shape with a geometric center (14), said wall (12) being at least partly provided with an infrared-reflecting and visible light-transmitting coating (15), and said cavity (13) accommodating a, substantially, linear electric light source (16), and said lamp also comprising a metal foil (17; 18) which is entirely embedded in the wall (12) and connected to the electric light source (16), and comprising a first end portion (21) and a second end portion (22) which are arranged so as to be opposite to each other and which both comprise a seal, through which seals a respective current conductor (23; 24) which is connected to the embedded metal foil (17; 18), issues from the lamp vessel (11) to the exterior, wherein, the electric lamp (10) is arranged in the reflector body (1) in such a manner that the first end portion (21) is at least partly situated in the neck-shaped portion (5), the cavity (13) is situated within the reflecting portion (2) and the electric light source (16) is predominantly situated on the optical axis (4), the connection point (28) where the first end portion current conductor (23) is connected to the metal foil (17) of the first end portion (21) being a distance dcI from the geometric center (14), the first end portion (21) having a length lepI measured from the geometric center (14), the connection point (27) where the second end portion current conductor (24) is connected to the metal foil (18) of the second end portion (22) being a distance dcII from the geometric center (14), the second end portion (22) having a length lepII measured from the geometric center (14), and wherein the ratios of the distances dcI;dcII to the respective lengths lepI;lepII is dcI/lepI>0.75 and dcII;lepII>0.75.