U.S. Philips Corporation

Marcellus H Smulders

Hendrik Jan Eggink

Petrus H Antonis

Gibbo Johannes Abrahamse

The lamp is provided with a metal holder (,) having an opening (,) and resilient body (,) which fastens the holder in a tube (,) which is in communication with the discharge space. A first portion (,) of the resilient body (,) is clamped in the opening (,) of the holder (,). A second folded portion (,) is clamped in inside the tube (,).

Low-pressure discharge lamp

A discharge vessel (10) closed in a gastight manner has a cavity (11) enclosing a discharge space provided with an ionizable filling. A coil (20) with a winding (21) of an electric conductor and an assembly (30) of a heat conductor (31) and one or several elongate cores (32) of soft-magnetic material are accommodated in the cavity. The cores (32) are arranged along a longitudinal axis (33) of the heat conductor (31) in one or several recesses (34) of the heat conductor which issue into a circumferential surface (36) of the assembly (30). The heat conductor (31) occupies at least half the circumference in a cross-section perpendicular to the longitudinal axis (33) of the assembly (30). The construction of the lamp according to the invention renders possible lamp operation at higher lamp powers also without the use of a heat pipe.

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Eindhoven, Netherlands

Marcellus H Smulders