An improved thermal printhead in which the base plate is provided with a print-end surface which is narrower than the thickness of the base plate by forming an inclined surface along one of the corner edges of the end surface adjoining one of the major surfaces of the base plate. Alternatively, a narrower end surface serving as the print-end surface may be defined by forming inclined surfaces along the two corner edges of the original end surface of the base plate. In either case, by appropriate selection of the width of the print-end surface, a glaze layer of a suitable property can be formed over the print-end surface by making use of the surface tension of the glaze layer in its molten state. By chamfering the lateral edges of the corners along either lateral end of the print-end surface, the terminal printhead is provided with a smooth contact surface which has an optimum lateral width for favorable contact with print media and a high level of smoothness for favorable movement of the printhead relative to print media.
A slope is provided from a heater area to the side of the edge of a substrate near the heater area. A resistance film layer and a common electrode are provided on the slope which is formed as a convexly curved surface. In the slope, a reinforcement conductor along the common electrode is embedded below the resistance film layer.
A slope is provided from a heater area to the side of the edge of a substrate near the heater area. A resistance film layer and a common electrode are provided on the slope which is formed as a convexly curved surface. In the slope, a reinforcement conductor along the common electrode is embedded below the resistance film layer.
A thermal print head includes a plurality of selective electrodes formed on a substrate, a common electrode formed on the substrate at a distance from the selective electrodes, and a fiber mounted on the substrate at a position between the common electrode and the selective electrodes. The fiber projects higher than the top surfaces of the common and selective electrodes, and is fixed to the substrate by an adhesive having a top surface which is upwardly inclined toward the fiber. Heat resistive films overlay the fiber and adhesive and electrically connect the selective electrodes to the common electrode.
A thermal print head including a glass layer disposed at the edge of a heat resistant substrate, a heat generating element on the glass layer and an electrode for driving the heat generating element disposed both under the glass layer and on the heat generating element is provided. The glass layer is formed of a lower layer of crystallized glass on the electrode and an upper non-crystallized glass portion under the heat generating element. The electrode under the glass layer is formed by print burning a thick conductive film on the substrate from a metal paste having a higher burning temperature than the burning temperature of the glass layers.
A slope is provided from a heater area to the side of the edge of a substrate near the heater area. A resistance film layer and a common electrode are provided on the slope which is formed as a convexly curved surface. In the slope, a reinforcement conductor along the common electrode is embedded below the resistance film layer.
