Importance

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Abstract

A printhead with a comparatively simple construction, which contributes to reducing the cost of the entire system and development work, effectively utilizes essential constituent devices of a logic circuit of the printhead such as a shift register, while omitting control on the printing apparatus side, and individually performs stable print operation, while suppressing variation of energy inputted to heat generators due to voltage drop by parasitic resistance. A printing apparatus incorporates the printhead. The printhead has a counter which counts the number of simultaneously-driven heat generators, which always changes in accordance with image data, based on externally-inputted image data and block selection signal, and a modulator which modulates the pulse width of a drive signal applied to the simultaneously-driven heat generators based on a value obtained from counting by the counter.

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First Claim