| 摘要 |
A printhead includes a plurality of switching elements which are arranged in correspondence with respective printing elements and control energization to the respective printing elements, a reference voltage circuit which generates a reference voltage, a current generation circuit which generates a reference current (I<SUB>ref</SUB>) on the basis of a reference voltage (V<SUB>ref</SUB>) generated by the reference voltage circuit, and a plurality of constant current sources which supply, in accordance with the reference current (I<SUB>ref</SUB>) generated by the current generation circuit, constant currents via the switching elements arranged in correspondence with the respective printing elements.
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