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    • 5. 发明授权
    • Thermal head with small size of steps of protective layer formed on heating portion and manufacturing method thereof
    • 在加热部分形成的保护层台阶小的热敏头及其制造方法
    • US06501497B2
    • 2002-12-31
    • US09940777
    • 2001-08-27
    • Takashi ShirakawaMasayoshi TakeuchiSatoshi KuboDaiki SugiyamaNoboru Tsushima
    • Takashi ShirakawaMasayoshi TakeuchiSatoshi KuboDaiki SugiyamaNoboru Tsushima
    • B41J2335
    • B41J2/3353B41J2/3357B41J2/3359
    • The present invention provides a thermal head having a long lifetime and a high printing quality by making the size of steps of a protective layer formed on a heating portion of a heating resistor small and a method for manufacturing the thermal heads. In the thermal head, respective lower-layer electrodes having a film thickness of approximately 2 &mgr;m are formed on outskirts portion of a bulging portion of a heat insulation layer excluding a heating portion of a heating resistor and portions in the vicinity of the heating portion. Then, respective upper-layer electrodes having a film thickness which falls in a range of 0.1 to 0.3 &mgr;m are continuously formed from portions at positions in the vicinity of the heating portion excluding the heating portion to upper surfaces of the lower-layer electrodes. Due to such a constitution, the size of the steps formed in the protective layer can be made extremely small and hence, it becomes possible to prevent dregs and dusts which are generated during printing from being gathered at the steps.
    • 本发明通过使形成在加热电阻体的加热部分上的保护层的台阶尺寸较小,以及制造热敏头的方法,提供了具有长寿命和高印刷质量的热敏头。 在热敏头中,除了加热电阻器的加热部分和加热部分附近的部分之外,在隔热层的凸出部分的外围部分形成膜厚约2μm的各个下层电极。 然后,将分别在加热部分附近的加热部分附近的部分的部分的下部电极的上表面连续地形成具有落在0.1〜0.3μm范围内的各个上层电极。 由于这样的结构,可以使形成在保护层中的台阶的尺寸变得非常小,因此可以防止在打印期间产生的渣滓和灰尘聚集在台阶上。