Patent Number: 7,042,135

Title: Current detection circuit and current detection method

Abstract: A current detection circuit which applies an AC voltage to a vibrator (1) which converts electricity into a mechanical energy to vibrate, and detects a mechanical branch current serving as a current component which contributes to the vibration of the vibrator (1), includes a series circuit which connects a capacitor (4) to the vibrator (1) in series, voltage dividing circuits (5, 6), connected to the series circuit in parallel, for dividing and extracting a voltage applied across the series circuit, and a detection circuit (7) for detecting a difference between, of the divided voltages, a terminal voltage other than the voltage applied across the series circuit and a voltage at a connection portion between the vibrator and the capacitor in the series circuit.

Inventors: Kataoka; Kenichi (Kanagawa, JP)

Assignee: Canon Kabushiki Kaisha

International Classification: H01L 41/08 (20060101)

Expiration Date: 5/09/02018