THERMAL HEAD

To provide a thermal head having a long service life.SOLUTION: A thermal head comprises: an underglaze layer provided on an insulation substrate; an electrode provided on the underglaze layer; an electrical heating element provided on the electrode; a first protective layer which includes a glass ma...

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Bibliographische Detailangaben
Hauptverfasser:	ONISHI NORIAKI, MIYASHIGE MICHIHIRO, YAMAJI NORIO
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	CORRECTION OF TYPOGRAPHICAL ERRORS i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME LINING MACHINES PERFORMING OPERATIONS PRINTING SELECTIVE PRINTING MECHANISMS STAMPS TRANSPORTING TYPEWRITERS
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Beschreibung
Zusammenfassung:	To provide a thermal head having a long service life.SOLUTION: A thermal head comprises: an underglaze layer provided on an insulation substrate; an electrode provided on the underglaze layer; an electrical heating element provided on the electrode; a first protective layer which includes a glass material for covering at least the electrical heating element; and a second protective layer which is provided on the first protective layer, and is formed from a material which has a melting point higher than that of the first protective layer, and of which a thermal expansion coefficient at 1000°C or less is generally constant to a temperature.SELECTED DRAWING: Figure 1 【課題】長寿命なサーマルヘッドを提供する。【解決手段】絶縁基板上に設けられたアンダーグレーズ層と、前記アンダーグレーズ層上に設けられた電極と、前記電極上に設けられた発熱体と、少なくとも前記発熱体を被覆する、ガラス材料を含む第１保護層と、前記第１保護層上に設けられ、前記第１保護層よりも高融点であり、１０００℃以下の熱膨張係数が温度に対して概略一定の材料で形成された第２保護層と、を備えるサーマルヘッド。【選択図】図１