Thermal head
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsNobuyoshi Taguchi, Koji Matsuo, Hiromu Takahashi, Fujio Oda
Life of this patent
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Abstract
A thin-film thermal head comprises a thin-film heat-generating resistor made of an alloy of Si and a high melting point metal such as Ta, Mo, Ti, W or Zr. Joule heat generated by supplying a pulse current to the thin-film heat-generating resistor is utilized to develop a color on a heat-sensitive recording paper for printing characters and pictures. Resistance against thermal shock of the thin-film heat-generating resistor is improved, thereby attaining a stable lifetime of the thermal head.
Claims5
In a thin-film thermal head comprising an insulating substrate having a glass layer on the surface thereof, a thin-film heat-generating resistor layer formed on said insulating substrate, a pair of electrodes formed on said thin-film heat-generating resistor layer to form a heat-generating section, and a wear-resistant layer formed to protect said heat-generating section;
- wherein said thin-film heat-generating resistor layer comprises a low resistivity layer made of an alloy of Si and a particular metal of high melting point and a high resistivity layer including at least Si, said low resistivity layer being formed on said glass layer of said insulating substrate through said high resistivity layer.
A thin film thermal head comprising:
- an insulating substrate having a glass layer along a surface thereof;
- a thin film heat generating resistor formed on said glass layer, said thin film heat generating resistor comprising a high resistivity layer formed on said glass layer, said high resistivity layer including at least Si, and a low resistivity layer formed on said high resistivity layer made from an alloy of Si and a particular metal having a high melting point;
- a pair of electrodes located on said thin film heat generating resistor to form a heat generating section;
- and
- a protective layer formed over said heat generating section to protect the same against wear.
Dependencies are inferred from the claim text.