| 摘要 |
<p>PURPOSE:To make the surface temperature of a protective layer uniform, to eliminate density irregularity of a printing quality and to obtain a thermal head of high quality by measuring variation in the surface temperature of a heat generating resistor protective layer by an infrared ray radiation microscope at the time of applying a rated printing pulse to a thermal head heat generating resistor, and applying a voltage pulse until a predetermined surface temperature and a thermal response characteristic are obtained to vary heat generating resistor characteristics. CONSTITUTION:A conductor, electrodes, a heat generating resistor are formed on a glazed board, a heat generating resistor protective layer is further formed, and polished to flatten the surface. Then, a rated printing pulse is applied to the generator, and variation in the surface temperature of the protective layer is measured by an infrared ray radiation microscope. If the surface temperature is deviated from a predetermined value, sensitivity of a heat response curve is deviated from a predetermined value, a voltage pulse is applied. This operation is repeated to obtain predetermined surface temperature and response characteristics at the time of applying a printing pulse.</p> |
