| 摘要 |
A thermal head has a protective coating of heating elements. The protective coating includes an insulating protective layer and an electrically conductive protective layer formed above the insulating protective layer. The electrically conductive protective layer covers at least a region of the insulating protective layer under which an under-glaze heat-accumulating layer is located and does not overlie at least one of the negative and positive electrode layers in other regions than the region. The thermal head can prevent abnormal current flow due to pinholes of the insulating protective layer formed under the electrically conductive protective layer, exhibit high reliability over an extended period of time and perform thermal recording of high-quality images consistently over an extended period of operation.
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