Actuator driving apparatus

An actuator driving apparatus comprising:

• start signal generating means for generating a start signal having a frequency substantially equal to a resonance frequency of a movable portion of an actuator;
• rock detecting means for detecting rock of the movable portion of the actuator;
• drive timing signal generating means for generating a drive timing signal based on an output of the rock detecting means;
• switch means connected to the start signal generating means and the drive timing signal generating means, the switch means selectively transmitting outputs of the start signal generating means and the drive timing signal generating means to means arranged in a subsequent stage;
• drive signal generating means for generating a drive signal based on an output of the switch means, and supplies the drive signal to the actuator;
• and
• superposition preventing means for preventing a signal having a frequency approximately equal to the resonance frequency of the movable portion and is equal to the start signal from being superposed upon a detection signal output from the rock detecting means, the detection signal being equal to the resonance frequency of the movable portion,
• wherein a driving operation is performed in accordance with a rocking state of the movable portion of the actuator, by switching the output of the switch means;
• and
• wherein the superposition preventing means stops an operation of the start signal generating means when the switch means outputs the drive timing signal.

An actuator driving apparatus comprising:

• start signal generating means for generating a start signal having a frequency substantially equal to a resonance frequency of a movable portion of an actuator;
• rock detecting means for detecting rock of the movable portion of the actuator;
• drive timing signal generating means for generating a drive timing signal based on an output of the rock detecting means;
• switch means connected to the start signal generating means and the drive timing signal generating means, the switch means selectively transmitting outputs of the start signal generating means and the drive timing signal generating means to means arranged in a subsequent stage;
• drive signal generating means for generating a drive signal based on an output of the switch means, and supplies the drive signal to the actuator;
• and
• superposition preventing means for preventing a signal having a frequency approximately equal to the resonance frequency of the movable portion and is equal to the start signal from being superposed upon a detection signal output from the rock detecting means, the detection signal being equal to the resonance frequency of the movable portion,
• wherein a driving operation is performed in accordance with a rocking state of the movable portion of the actuator, by switching the output of the switch means;
• and
• wherein the start signal generating means includes oscillation means and divider means, the oscillation means generating a signal having a frequency higher the resonance frequency of the movable portion of the actuator, the divider means dividing an output of the oscillation means, the start signal generating means functioning as the superposition preventing means.