# US 9,883,108 B2 · Imaging apparatus and image blur correction method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,883,108 B2 - Document ID: US9883108B2 - Status: Granted - Kind: B2 - Application number: 15/592,362 - Filed: 2017-05-11 - Published: 2017-08-24 - Granted: 2018-01-30 - Earliest claimed: 2014-12-02 - Assignees: FUJIFILM Corporation - Applicants: FUJIFILM Corporation - Inventors: Tetsu Wada - Web page: https://patentgrep.com/patent/US9883108B2 ## CPC - H04N 23/687: {by shifting the lens or sensor position} - G03B 3/10: Power-operated focusing - G03B 13/36: Autofocus systems - H04N 23/67: Focus control based on electronic image sensor signals - H04N 23/6812: {based on additional sensors, e.g. acceleration sensors} - G03B 2205/0007: Movement of one or more optical elements for control of motion blur - G03B 2217/005: Blur detection - H04N 23/63: by using electronic viewfinders - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - 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 An imaging apparatus includes: a driving unit that moves a focus lens; a focusing unit that determines a focus state and outputs a focusing signal indicating a focus position of the focus lens; a control unit that controls the driving unit based on the focusing signal; an acceleration detection unit that detects acceleration in directions of three orthogonal axes; a distance calculation unit that calculates an acceleration component in an optical axis direction based on the acceleration in the directions of the three orthogonal axes detected by the acceleration detection unit and calculates an object distance corresponding to the focus position indicated by the focusing signal based on the acceleration component in the optical axis direction; and a shake correction unit that corrects an image blur caused by a translational shake in directions of two orthogonal axes perpendicular to at least an optical axis as defined herein. ## Claims ### Claim 1 An imaging apparatus comprising: a driving unit that moves a focus lens; a focusing unit that determines a focus state and outputs a focusing signal indicating a focus position of the focus lens; a control unit that controls the driving unit based on the focusing signal; an acceleration detection unit that detects acceleration of the imaging apparatus in directions of three orthogonal axes; a distance calculation unit that calculates an acceleration component in an optical axis direction based on the acceleration in the directions of the three orthogonal axes detected by the acceleration detection unit and calculates an object distance corresponding to the focus position indicated by the focusing signal based on the acceleration component in the optical axis direction; and a shake correction unit that corrects an image blur caused by a translational shake in directions of two orthogonal axes perpendicular to at least an optical axis based on the object distance calculated by the distance calculation unit and the acceleration in the directions of the three orthogonal axes detected by the acceleration detection unit, wherein the distance calculation unit calculates the object distance corresponding to the focus position indicated by the focusing signal based on the acceleration component in the optical axis direction, using characteristic information in which a correlation between the focusing signal and a position of the focus lens moved based on the focusing signal is represented by a relationship with the acceleration in the optical axis direction, and wherein at least one hardware processor implements the focusing unit, the control unit, the distance calculation unit, and the shake correction unit. ### Claim 2 (depends on 1) The imaging apparatus according to claim 1, wherein the characteristic information is a data table in which the focusing signal and the position of the focus lens moved based on the focusing signal are associated with each other for each of a plurality of acceleration values in the optical axis direction. ### Claim 3 (depends on 2) The imaging apparatus according to claim 2, wherein the driving unit includes a voice coil motor that includes a magnet and a driving coil and generates a driving force to move the focus lens according to a driving current supplied to the driving coil, and the focusing signal indicates a value of the driving current. ### Claim 4 (depends on 3) The imaging apparatus according to claim 3, further comprising: an angular velocity detection unit that detects an angular velocity about the two orthogonal axes, wherein the shake correction unit corrects an image blur caused by a rotational shake about the two orthogonal axes based on the angular velocity about the two orthogonal axes detected by the angular velocity detection unit. ### Claim 5 (depends on 2) The imaging apparatus according to claim 2, further comprising: an angular velocity detection unit that detects an angular velocity about the two orthogonal axes, wherein the shake correction unit corrects an image blur caused by a rotational shake about the two orthogonal axes based on the angular velocity about the two orthogonal axes detected by the angular velocity detection unit. ### Claim 6 (depends on 1) The imaging apparatus according to claim 1, wherein the characteristic information is a function having the focusing signal as a variable. ### Claim 7 (depends on 6) The imaging apparatus according to claim 6, wherein the driving unit includes a voice coil motor that includes a magnet and a driving coil and generates a driving force to move the focus lens according to a driving current supplied to the driving coil, and the focusing signal indicates a value of the driving current. ### Claim 8 (depends on 7) The imaging apparatus according to claim 7, further comprising: an angular velocity detection unit that detects an angular velocity about the two orthogonal axes, wherein the shake correction unit corrects an image blur caused by a rotational shake about the two orthogonal axes based on the angular velocity about the two orthogonal axes detected by the angular velocity detection unit. ### Claim 9 (depends on 6) The imaging apparatus according to claim 6, further comprising: an angular velocity detection unit that detects an angular velocity about the two orthogonal axes, wherein the shake correction unit corrects an image blur caused by a rotational shake about the two orthogonal axes based on the angular velocity about the two orthogonal axes detected by the angular velocity detection unit. ### Claim 10 (depends on 1) The imaging apparatus according to claim 1, wherein the driving unit includes a voice coil motor that includes a magnet and a driving coil and generates a driving force to move the focus lens according to a driving current supplied to the driving coil, and the focusing signal indicates a value of the driving current. ### Claim 11 (depends on 10) The imaging apparatus according to claim 10, further comprising: an angular velocity detection unit that detects an angular velocity about the two orthogonal axes, wherein the shake correction unit corrects an image blur caused by a rotational shake about the two orthogonal axes based on the angular velocity about the two orthogonal axes detected by the angular velocity detection unit. ### Claim 12 (depends on 1) The imaging apparatus according to claim 1, further comprising: an angular velocity detection unit that detects an angular velocity about the two orthogonal axes, wherein the shake correction unit corrects an image blur caused by a rotational shake about the two orthogonal axes based on the angular velocity about the two orthogonal axes detected by the angular velocity detection unit. ### Claim 13 (depends on 1) The imaging apparatus according to claim 1, wherein the at least one hardware processor comprises a first processor implementing the focusing unit and a second processor implementing the control unit, the distance calculation unit, and the shake correction unit. ### Claim 14 An image blur correction method comprising: moving a focus lens based on a focusing signal indicating a focus position; detecting acceleration in directions of three orthogonal axes which acts on an imaging apparatus; calculating an acceleration component in an optical axis direction based on the acceleration in the directions of the three orthogonal axes detected in the acceleration detection step and calculating an object distance corresponding to the focus position indicated by the focusing signal based on the acceleration component in the optical axis direction; and correcting an image blur caused by a translational shake in directions of two orthogonal axes perpendicular to at least an optical axis based on the object distance calculated in the distance calculation step and the acceleration in the directions of the three orthogonal axes detected in the acceleration detection step, wherein, in the calculating the object distance, the object distance corresponding to the focus position indicated by the focusing signal is calculated based on the acceleration component in the optical axis direction, using characteristic information which is acquired in advance and in which a correlation between the focusing signal and a position of the focus lens moved based on the focusing signal is represented by a relationship with the acceleration in the optical axis direction. ### Claim 15 (depends on 14) The image blur correction method according to claim 14, wherein the characteristic information is a data table in which the focusing signal and the position of the focus lens moved based on the focusing signal are associated with each other for each of a plurality of acceleration values in the optical axis direction. ### Claim 16 (depends on 15) The image blur correction method according to claim 15, further comprising: detecting an angular velocity about the two orthogonal axes, wherein an image blur caused by a rotational shake about the two orthogonal axes is corrected based on the detected angular velocity about the two orthogonal axes. ### Claim 17 (depends on 14) The image blur correction method according to claim 14, wherein the characteristic information is a function having the focusing signal as a variable. ### Claim 18 (depends on 17) The image blur correction method according to claim 17, further comprising: detecting an angular velocity about the two orthogonal axes, wherein an image blur caused by a rotational shake about the two orthogonal axes is corrected based on the detected angular velocity about the two orthogonal axes. ### Claim 19 (depends on 14) The image blur correction method according to claim 14, further comprising: detecting an angular velocity about the two orthogonal axes, wherein an image blur caused by a rotational shake about the two orthogonal axes is corrected based on the detected angular velocity about the two orthogonal axes.