Importance

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Abstract

Disclosed is a printhead in which mixture of noise between the power supplies of analog and digital systems is suppressed, and a circuit for processing a small analog signal, e.g., a temperature sensing circuit, does not decrease in precision even for a high clock frequency. In the printhead including an element board on which a digital circuit including a driver and heater array and an analog circuit including a temperature sensing block are formed by a semiconductor process, and an electrical circuit board having a plurality of external input terminals for inputting/outputting signals from/to the element board, the power supply of the digital circuit and the power supply of the analog circuit are arranged apart from each other on the element board, and commonly connected to one terminal of a capacitor provided on the electrical circuit board with the other terminal grounded on the electrical circuit board.

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First Claim