| 摘要 |
<p>PURPOSE:To execute pulse trimming regulation for resistance values of respective heating elements Ra, Rb, Rc, Rd, Re, Rf formed on a surface of an insulation substrate of a thermal printing head simultaneously for a plurality of the heating elements and by high precision. CONSTITUTION:In a pulse trimming device consisting of voltage pulse application circuits 4a, 4b, 4c, 4d to be applied to each of a plurality of heating elements Ra, Rb, Rc, Rd, Re, Rf of a thermal printing head, short circuits 13a, 13b, 13c, 13d, 13e, 13f which short-circuit selectively both ends of said heating element are provided to a plurality of heating elements Ra, Rb, Rc, Rd, Re, Rf respectively.</p> |
