Drive device and method for controlling the drive device
AssigneeOlympus Corporation
InventorTakashi Ishikawa
Life of this patent
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Abstract
A drive device includes a drive controller. The drive controller controls a drive signal on which a high-frequency drive signal is superimposed on a drive current to drive a movable frame and which is to be applied to a drive coil. The drive controller drives the movable frame to a predetermined position based on a detection signal detected by a detector and a high-frequency signal of a predetermined frequency band including a frequency of the high-frequency drive signal that is generated in a detection coil when the drive signal is applied to the drive coil.
Claims5
A drive device comprising:
- a fixed frame on which one of a drive coil and a magnet facing the drive coil is disposed;
- a movable frame on which another one of the drive coil and the magnet is disposed and which is movable relative to the fixed frame;
- a detector that is disposed on one of the fixed frame and the movable frame on which the drive coil is disposed, and that detects and outputs a detection signal corresponding to a magnetic flux of the magnet;
- a detection coil that is disposed on one of the fixed frame and the movable frame on which the magnet is disposed, and in a position facing the drive coil with the magnet interposed;
- and
- a drive controller that controls a drive signal on which a high-frequency drive signal is superimposed on a drive current to drive the movable frame and which is to be applied to the drive coil, and that drives the movable frame to a predetermined position based on the detection signal detected by the detector and a high-frequency signal of a predetermined frequency band including a frequency of the high-frequency drive signal that is generated in the detection coil when the drive signal is applied to the drive coil.
A method for controlling a drive device comprising:
- a fixed frame on which one of a drive coil and a magnet facing the drive coil is disposed;
- a movable frame on which another one of the drive coil and the magnet is disposed and which is movable relative to the fixed frame;
- a detector that is disposed on one of the fixed frame and the movable frame on which the drive coil is disposed, and that detects and outputs a detection signal corresponding to a magnetic flux of the magnet;
- and a detection coil that is disposed on one of the fixed frame and the movable frame on which the magnet is disposed, and in a position facing the drive coil with the magnet interposed, the method comprising:
- applying to the drive coil a drive signal on which a high-frequency drive signal is superimposed on a current that drives the movable frame;
- acquiring an amplitude of a predetermined frequency band including a frequency of the high-frequency drive signal from a high-frequency signal of the predetermined frequency band including the frequency of the high-frequency drive signal that is generated in the detection coil;
- calculating a distance-equivalent value equivalent to a distance between the detection coil and the drive coil based on the acquired amplitude;
- correcting the drive signal to be applied to the drive coil based on the calculated distance-equivalent value;
- and
- driving the movable frame to a predetermined position by applying the corrected drive signal to the drive coil.
Dependencies are inferred from the claim text.