Abstract: The ink jet print head according to this invention includes a plurality of nozzles; a plurality of electrothermal transducers with one transducer provided for each of the plurality of nozzles, the electrothermal transducers being adapted to eject ink supplied into the nozzles when energized; an energization start circuit to start energizing the electrothermal transducers; a voltage detection circuit to detect a voltage applied to the electrothermal transducers after starting the energization; and an energization stop circuit to stop the energization of the electrothermal transducers according to the voltage detected by the voltage detection circuit.

Abstract: An anti-vibration apparatus includes a table, an actuator system which applies a force to the table, a first system which applies to the actuator system a first signal for causing the actuator system to apply the force in proportion to a displacement of the table, and a second system which applies to the actuator system a second signal for causing the actuator system to apply the force based on an acceleration of the table. The first and second signals are generated by the first and second systems, respectively, so that a natural vibration mode of a system including the table and the actuator system is unchanged.