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    • 4. 发明授权
    • Thermal printer head having current sensors connected to heating elements
    • 热敏打印头具有连接到加热元件的电流传感器
    • US5422662A
    • 1995-06-06
    • US36831
    • 1993-03-25
    • Itaru FukushimaNakaba NakamuraTakashi Okamoto
    • Itaru FukushimaNakaba NakamuraTakashi Okamoto
    • B41J2/365B41J2/37B41J2/35B41J2/355
    • B41J2/37B41J2/365
    • A thermal printer head comprises an array of heating elements (1-1.about.1-N) mounted on an insulating base member (20). Each of the heating elements is connected to a common voltage source (V) and has a temperature dependent electrical resistance. Electrically resistive elements (2-1.about.2-N) are respectively connected in series with the heating elements to form a plurality of series circuits. Current supply circuits (3-1.about.3-N, 4-1.about.4-N, 5, 6, 7-1.about.7-N, 14) are provided corresponding respectively to the resistive elements for selectively supplying a current to the series circuits in response to a sequence of print signals. A control circuit (8-11, 14) makes a determination whether a voltage developed across each resistive element is higher or lower than a prescribed threshold value and causes one of the current supply ciruits corresponding to the resistive element to control the current depending on the determination.
    • 热敏打印头包括安装在绝缘基底构件(20)上的加热元件阵列(1-1差1-N)。 每个加热元件连接到公共电压源(V)并且具有取决于温度的电阻。 电阻元件(2-1差分2-N)分别与加热元件串联连接以形成多个串联电路。 分别提供电流供应电路(3-1差分3-N,4-1差分4-N,5,6,7-1差分7-N,14),分别对应于电阻元件,用于选择性地向串联 响应于一系列打印信号的电路。 控制电路(8-11,14)确定每个电阻元件上产生的电压是否高于或低于规定的阈值,并且使与电阻元件相对应的电流供给电路中的一个根据 决心。