| 摘要 |
PURPOSE:To eliminate unevenness in drop of voltage and permit printing undergoing no fluctuation in density by a thermal head wherein a connection conductor of a common electrode is provided separate from and substantially in the same plane as a circuit board for supplying a driving current to individual separate electrodes. CONSTITUTION:A thermal head comprises an insulating substrate 12 formed of a semi-cylindroidal electric insulator such as glass, which is provided at its top with a plurality of heating resistors 11 made of electric resistors, and a heat radiating plate 13 which is formed of a conductive metal such as aluminum and to which is mounted the substrate 12. A common electrode 15 is so constituted that it is commonly connected on the base end side thereof through a connection electrode 16 for each of the heating resistors 11 in the predetermined number. Separate electrodes 14 and the common electrode 15 are provided on the insulating substrate 12 facing each other with the respective heating resistors 11 therebetween. When a driving current is supplied to the side of the separate electrodes 14, the corresponding heating resistors 11 are heated to make print recording on a heat sensitive recording medium of heat sensitive paper. |
