Thermal head, method of manufacturing the same, and thermal stencil making apparatus using the same

摘要

A thermal head includes a heat radiating plate (11) and an electrical insulating substrate (12) which is provided with a plurality of resistance heater elements (15) arranged in a direction over a predetermined length and a plurality of electrodes (16) for energizing the resistance heater and is integrated with the heat radiating plate. The substrate is smaller than the heat radiating plate in coefficient of thermal expansion and is fixed to the heat radiating plate at a temperature higher than the normal working temperature range of the thermal head. In the normal working temperature range of the thermal head, the thermal head is convex toward the resistance heater in a cross-section taken along a line parallel to the direction in which the resistance heater elements are arranged due to the difference in coefficient of thermal expansion between the heat radiating plate and the substrate. <IMAGE>