Ceramics heater for fixing toner image

摘要

A ceramics heater for fixing a toner image causing no cracking of a ceramics substrate, having high connection reliability between an electrode and a connector and capable of attaining improvement of a fixing speed and size increase of a transfer material is provided. The heater, which is adapted to heat and fix a toner image on a transfer material, comprises a ceramics substrate (1a) containing silicon nitride and a heat generator (1b) formed on the ceramics substrate (1a). The thermal conductivity and the transverse rupture strength of silicon nitride forming the ceramics substrate (1a) are preferably at least 40 W/mK and at least 50 kg/mm<2> respectively, and the thickness of the ceramics substrate (1a) can be reduced to 0.1 to 0.5 mm. <IMAGE>