# US 10,313,590 B2 · Drive device and method for controlling the drive device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,313,590 B2 - Document ID: US10313590B2 - Status: Granted - Kind: B2 - Application number: 15/829,519 - Filed: 2017-12-01 - Published: 2018-07-19 - Granted: 2019-06-04 - Earliest claimed: 2017-01-16 - Assignees: Olympus Corporation - Applicants: Olympus Corporation - Inventors: Takashi Ishikawa - Web page: https://patentgrep.com/patent/US10313590B2 ## CPC - H04N 23/6812: {based on additional sensors, e.g. acceleration sensors} - G01P 15/105: by magnetically sensitive devices - G03B 5/00: Adjustment of optical system relative to image or object surface other than for focusing - H04N 23/54: Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils - H04N 23/687: {by shifting the lens or sensor position} - G03B 2205/0007: Movement of one or more optical elements for control of motion blur - G03B 2205/0038: by displacing the image plane with respect to the optical axis - G03B 2205/0069: using electromagnetic actuators, e.g. voice coils - G03B 2217/005: Blur detection - H04N 23/63: by using electronic viewfinders - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - G01P: MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT (measuring or recording blood flow A61B5/02, A61B8/06; monitoring speed or deceleration of electrically-propelled vehicles B60L3/00; vehicle lighting systems adapted to indicate speed B60Q1/54; determining position or course in navigation, measuring ground distance in geodesy or surveying G01C; combined measuring devices for measuring two or more variables of movement G01C23/00; measuring velocity of sound G01H; measuring velocity of light G01J7/00; measuring direction or velocity of solid objects by reception or emission of radiowaves or other waves and based on propagation effects, e.g. Doppler effect, propagation time, direction of propagation, G01S; measuring speed of nuclear radiation G01T; measuring acceleration of gravity G01V; {measuring or recording the speed of trains B61L23/00; speed indicators incorporated in motor vehicles B60K35/00; measuring frequency or phase G01R; traffic control G08G}) - G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D) ## Abstract A drive device includes a noise signal calculation unit, a signal correction unit, and a drive controller. The noise signal calculation unit calculates a noise signal corresponding to a magnetic flux generated from a current flowing through a drive coil. The signal correction unit corrects a detection signal detected by a detector based on the noise signal. The drive controller controls a drive signal to be applied to the drive coil based on a corrected signal obtained by the signal correction unit. The noise signal calculation unit acquires an amplitude of a predetermined frequency band including a frequency of a high-frequency drive signal, and calculates the noise signal included in the detection signal based on the acquired amplitude. ## Claims ### Claim 1 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 noise signal calculation unit that calculates a noise signal corresponding to a magnetic flux generated from a current flowing through the drive coil; a signal correction unit that corrects the detection signal detected by the detector based on the noise signal; and a drive controller that controls, based on a corrected signal obtained from correction by the signal correction unit, a drive signal to be applied to the drive coil and that drives the movable frame to a position corresponding to the corrected signal, wherein from the detection signal detected by the detector when a drive signal, in which a high-frequency drive signal is superimposed on a drive current to drive the movable frame, is applied to the drive coil, the noise signal calculation unit acquires an amplitude of a predetermined frequency band including a frequency of the high-frequency drive signal, and calculates the noise signal included in the detection signal based on the acquired amplitude. ### Claim 2 (depends on 1) The drive device according to claim 1, wherein: the noise signal included in the detection signal is represented by a product of the current I flowing through the drive coil and a false position signal coefficient G; and where an amplitude of the high-frequency drive signal is represented by A and the acquired amplitude of the predetermined frequency band is represented by H, the false position signal coefficient G is expressed by: G=H/A. ### Claim 3 (depends on 2) The drive device according to claim 2, wherein: where the corrected signal is represented by H′, the corrected signal H′ relative to a detection signal B that is uncorrected and acquired by the detector is expressed by: H′=B−I×G. ### Claim 4 (depends on 1) The drive device according to claim 1, further comprising: an imaging element that is disposed in the movable frame and that generates a video signal relating to an object; and a display unit that displays an image based on the video signal, wherein the predetermined frequency of the high-frequency drive signal is a frequency that makes an amount of movement of the movable frame fall within a range of one pixel of the imaging element. ### Claim 5 (depends on 1) The drive device according to claim 1, further comprising: an imaging element that is disposed in the movable frame and that generates a video signal relating to an object; and a display unit that displays an image based on the video signal, wherein when the false position signal coefficient G has a value out of a predetermined range, the noise signal calculation unit displays an error notification that the current I flowing through the drive coil is uncorrectable. ### Claim 6 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; and 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, the method comprising: applying a drive signal, in which a high-frequency drive signal is superimposed on a drive current to drive the movable frame, to the drive coil; acquiring an amplitude of a predetermined frequency band including a frequency of the high-frequency drive signal from the detection signal detected by the detector; calculating a noise signal included in the detection signal based on the acquired amplitude; correcting the detection signal detected by the detector based on the noise signal; and controlling, based on a corrected signal obtained from the correcting, a drive signal to be applied to the drive coil and driving the movable frame to a position corresponding to the corrected signal.