| 摘要 |
<p>PURPOSE:To increase the life of a thin film thermal head with a simple structure by employing a TaC-Si material as a heating resistor, and specifying the composition ratio of its SiC. CONSTITUTION:A thermal head employs an alumina board 1 as an insulating board, and a glazed layer 2, a TaC-SiC heating resistor layer 3, an electrode layer 4, an oxidation preventive film and a wear resistant layer 5 are sequentially laminated and formed on the board 1. The composition ratio of the SiC to the TaC is set to 1-5W%. When the composition ratio of the sole TaC of the resistor and the SiC of the TaC becomes approx. 10W%, the ageing change of the resistance value becomes abrupt, but when the ratio of the SiC is 2-3W%, the ageing change is smooth. When the ratio is 1-5W%, it is sufficient. Thus, the life of the head can be increased.</p> |
