Thermal print head
First Claim
Patent Images
1. A thermal print head comprising:
- a semiconductor substrate;
a resistor layer formed on the semiconductor substrate and having a plurality of heat generating portions arranged in a main scanning direction;
a wiring layer formed on the semiconductor substrate and included in a conduction path for energizing the plurality of heat generating portions;
an insulating protective layer covering the wiring layer and the resistor layer; and
an insulation layer formed on the semiconductor substrate,wherein the conduction path includes the semiconductor substrate,the wiring layer includes a plurality of individual electrodes and a common electrode, the plurality of individual electrodes being connected to the plurality of heat generating portions, respectively, the common electrode includes a portion arranged opposite to the plurality of individual electrodes with respect to the plurality of heat generating portions, the common electrode being electrically connected to the plurality of heat generating portions, and the common electrode being electrically connected to the semiconductor substrate,the insulation layer is formed with a common-electrode first opening for electrically connecting the semiconductor substrate to the common electrode, and formed with a common-electrode second opening opposite to the common-electrode first opening with respect to the plurality of heat generating portions in a sub-scanning direction for electrically connecting the semiconductor substrate to the common electrode,the resistor layer includes a resistor-side second through-conductive portion held in contact with the semiconductor substrate via the common-electrode second opening.
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Abstract
A thermal print head includes a semiconductor substrate, a resistor layer and a wiring layer. The resistor layer is formed on the semiconductor substrate and has a plurality of heat generating portions arranged in the main scanning direction. The wiring layer is formed on the semiconductor substrate to be included in a conduction path for energizing the plurality of heat generating portions. The conduction path includes a path or paths provided by the semiconductor substrate itself.
4 Citations
35 Claims
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1. A thermal print head comprising:
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a semiconductor substrate; a resistor layer formed on the semiconductor substrate and having a plurality of heat generating portions arranged in a main scanning direction; a wiring layer formed on the semiconductor substrate and included in a conduction path for energizing the plurality of heat generating portions; an insulating protective layer covering the wiring layer and the resistor layer; and an insulation layer formed on the semiconductor substrate, wherein the conduction path includes the semiconductor substrate, the wiring layer includes a plurality of individual electrodes and a common electrode, the plurality of individual electrodes being connected to the plurality of heat generating portions, respectively, the common electrode includes a portion arranged opposite to the plurality of individual electrodes with respect to the plurality of heat generating portions, the common electrode being electrically connected to the plurality of heat generating portions, and the common electrode being electrically connected to the semiconductor substrate, the insulation layer is formed with a common-electrode first opening for electrically connecting the semiconductor substrate to the common electrode, and formed with a common-electrode second opening opposite to the common-electrode first opening with respect to the plurality of heat generating portions in a sub-scanning direction for electrically connecting the semiconductor substrate to the common electrode, the resistor layer includes a resistor-side second through-conductive portion held in contact with the semiconductor substrate via the common-electrode second opening. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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Specification