| 摘要 |
A thermal printhead A includes a glaze layer 2 formed on an insulating substrate 1, a resistor layer 3 formed on the glaze layer, a conductor layer 4 formed so that part of the resistor layer is exposed to serve as a heating portion 3c and a protective film 5 formed to cover the conductor layer 4 and the heating portion 3c. The protective film 5 includes a lower first protective layer 5a, and an upper second protective layer 5b overlapping the first protective layer 5a and serving as the outermost layer. The first protective layer 5a has a hardness of 500 to 800 Hk and a thickness of 1 to 2 mum. The second protective layer 5b has a hardness of 1000 to 2000 Hk and a thickness of 5 to 8 mum.
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