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US 2008/0174901 A1Published application
Actuator unit, driving device for information recording/reading head, information recording/reading apparatus, and method for driving the actuator unit
AssigneeKonica Minolta Opto, Inc.
InventorsYasutaka TANIMURA, Shigeaki TOCHIMOTO
Life of this patent
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Abstract
An actuator unit including a friction drive actuator, a driving device for information recording/reading head, an information recording/reading apparatus and a method for driving the actuator unit which can achieve both high precision and high speed is provided by waiting the residual vibration to attenuate or forcibly attenuating the residual vibration to achieve high speed positioning by driving the friction drive actuator in the expansion and contraction mode after a high speed movement in the resonant drive mode.
Claims17
An actuator unit, comprising:
- a friction drive actuator which is powered by an electromechanical conversion element;
- a drive section which has a resonant drive mode and an expansion and contraction drive mode as a drive mode for driving the friction drive actuator, wherein in the resonant drive mode, the friction drive actuator is vibrated in resonance, and in the expansion and contraction drive mode, the friction drive actuator is expanded and contracted;
- and
- a control section which switches the drive mode from the resonant drive mode to the expansion and contraction drive mode,
- wherein when the control section switches the drive mode from the resonant drive mode to the expansion and contraction drive mode, the control section terminates the resonant drive mode and then starts the friction drive mode after an amplitude of a residual vibration of the friction drive actuator has decayed to a predetermined value.
2 more elements
A driving device for driving an information recording/reading head, the method comprising:
- an actuator unit which drives the information recording/reading head, the actuator unit including:
- a friction drive actuator which is powered by an electromechanical conversion element;
- a drive section which has a resonant drive mode and an expansion and contraction drive mode as a drive mode for driving the friction drive actuator, wherein in the resonant drive mode, the friction drive actuator is vibrated in resonance, and in the expansion and contraction drive mode, the friction drive actuator is expanded and contracted;
- and
- a control section which switches the drive mode from the resonant drive mode to the expansion and contraction drive mode,
- wherein when the control section switches the drive mode from the resonant drive mode to the expansion and contraction drive mode, the control section terminates the resonant drive mode and then starts the friction drive mode after an amplitude of a residual vibration of the friction drive actuator has decayed to a predetermined value.
3 more elements
An information recording/reading apparatus, comprising:
- a driving device for driving an information recording/reading head, the driving device including:
- an actuator unit which drives the information recording/reading head, the actuator unit having:
- a friction drive actuator which is powered by an electromechanical conversion element;
- a drive section which has a resonant drive mode and an expansion and contraction drive mode as a drive mode for driving the friction drive actuator, wherein in the resonant drive mode, the friction drive actuator is vibrated in resonance, and in the expansion and contraction drive mode, the friction drive actuator is expanded and contracted;
- and
- a control section which switches the drive mode from the resonant drive mode to the expansion and contraction drive mode,
- wherein when the control section switches the drive mode from the resonant drive mode to the expansion and contraction drive mode, the control section terminates the resonant drive mode and then starts the friction drive mode after an amplitude of a residual vibration of the friction drive actuator has decayed to a predetermined value.
4 more elements
A method for driving an actuator unit, the method comprising the steps of:
- driving a friction drive actuator by causing resonant vibration of a friction drive actuator, the friction drive actuator being powered by an electromechanical conversion element;
- driving the friction drive actuator by causing expansion and contraction of the friction drive actuator;
- and
- switching from the step of driving by resonant vibration to the step of driving by expansion and contraction,
- wherein in the step of switching, the step of driving by expansion and contraction is started when an amplitude of a residual vibration of the friction drive actuator has decayed to no greater than a predetermined value after terminating the step of driving by resonant vibration.
2 more elements
Dependencies are inferred from the claim text.