Hoechst Ceramtec Aktiengesellschaft

Peter Schlagbaum

Helmut Stuhler

Wilfried H Krings

In the ceramic insulating block for halogen lamps, which has a shallow channel with a re-entrant projection at its exit side, the insulating block (1) is provided at the entry side (9) of the shallow channel (2) with a recess (10) having a bell-shaped contour. The apex (11) of the recess extends towards the exit side (4) of the shallow channel (2). The recess has an apex height H.sub.s of .ltoreq.40%, an apex radius R.sub.s of .ltoreq.20% of the height H of the insulating block (1) and a base radius R.sub.B of between 140% and 60% of R.sub.S.

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Leinburg, Germany

Peter Schlagbaum