U.S. Philips Corporation

U.S. Phillips Corporation

Petrus Jm Fransen

Petrus H Antonis

Nicasius G Van Gennip

Winand Ham Friederichs

An electric lamp according to the invention comprises a lamp vessel (10) which is closed in a gastight manner, which has an end portion (11), and which surrounds a light source (12). The lamp vessel supports a cylindrical collar (30) with an axis (31) at its end portion (11). One or several projections (33a, 33b, 33c) of a first coupling member (30) which each grip into a respective recess (41a, 41c) of a second coupling member (40) couple the collar (30) to a mounting member (40) for fastening the lamp to a carrier. At least one of the coupling members (30) is made of an elastic material. The second coupling member (40) has two or more axial zones (43, 43') each with at least one recess (41a, 41b, 41c; 41a', 41b, 41c') and a raised step (42a, 42b, 42c; 42a', 42b', 42c') which bounds the recess in tangential direction, while a raised step (42a, 42b, 42c) of an axial zone (43) also forms part of an axial boundary of a recess (41a', 41c') of an adjoining axial zone (43') each time, and the raised steps and the one or several projections (33a, 33b, 33c) have mutually self-locating shapes in at least one tangential direction. The construction of the lamp according to the invention renders it possible to remove the lamp vessel from the mounting member without the use of a tool, but counteracts an inadvertent removal.

Electric lamp

An electrodeless low-pressure discharge lamp according to the invention has a lamp vessel (1) which is closed in a gastight manner, which contains an ionizable filling, and which has a cavity (10). In the cavity (10) an elongate coil (2) is positioned with a primary and a secondary winding (21, 22, respectively) of an electrical conductor (20) around a coil former (3) which has a tip (30) which points into the cavity (10). The electrical conductor (20) from which the secondary winding (22) is formed extends from a first end (22a) of the secondary winding (22) facing the tip (30) into a recess (32) of the tip (30) of the coil former (3) and is clamped therein. The first end (22a) of the secondary winding (22) can be easily fastened in this manner.

Electrodeless low-pressure discharge lamp with specific electrical

An electrodeless low-pressure discharge lamp according to the invention is provided with a lamp vessel which is closed in a gastight manner and which has an ionizable filling. The lamp vessel has an end portion with a cavity in which an electric coil is accommodated. The cavity further contains a heat conductor which extends to outside the cavity and has a flange there with an axis, a circumference, a surface which faces away from the lamp vessel and a surface which faces the lamp vessel. A mounting member is connected to the lamp vessel and fastened against the flange. The mounting member is provided with at least one hook which points radially inwards and which cooperates with a recess in the surface of the flange which faces away from the lamp vessel. The recess issues into an axial groove at the circumference of the flange extending into the surface facing the lamp vessel. This construction renders possible a quick assembly of the mounting member with the flange.

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Eindhoven, Netherlands

Petrus Jm Fransen