| 摘要 |
PURPOSE:To enable a pressing force of a thermal head to be lowered with obtaining a constant good contact at a heating portion and to prevent a damage on an ink ribbon, by a method wherein; a thermal head provided with a heating portion at an end of a substrate and a projecting strip portion at the other end thereof is allowed to abut on a platen at the heating portion and the projecting strip portion in printing and to travel so as to be led by the other end having the convex projecting portion thereon. CONSTITUTION:A heating portion 3 is formed at an end of a thermal head 1 and a convex strip portion 7 is formed at the other end thereof. The projecting strip portion 7 is made of a glaze layer or a dummy heating element and set slightly higher than the heating portion. Since the head presses a platen 6 only at the area of the heating portion 3 and the projecting strip portion 7, the contact pressure of nearly 200-500g is adequate for a printing and also can be set higher at the heating portion 3. The thermal head 1 is so installed as to have a slight slant by forming the projecting strip portion 7 higher than the heating portion 3, which enables the pressing force to be increased still more at the heating portion 3. The projecting strip portion 7 is so constructed s to have an approximately semicircular cross section to prevent a damage on an ink ribbon 4. |
