Camera control device and imaging device with camera shake correction function

• US 11,003,054 B2
• Filed: 12/13/2017
• Issued: 05/11/2021
• Est. Priority Date: 12/21/2016
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Kabasawa, Hidetoshi, Yamashita, Kosei, Murakoshi, Sho, Matsumoto, Tomohiro, Segami, Masahiro
• Primary Examiner(s): Ye, Lin
• Assistant Examiner(s): Nguyen, Chan T
• Application Number:
  US16/349,763
• Publication Number:
  US 20190331983A1
• Time in Patent Office: 1,245 Days
• Field of Search: 348345
• CPC Class Codes: G01P 15/09 by piezoelectric pick-up
• CPC Class Codes: G01P 15/12 by alteration of electrical resistance G01P15/0897, G01P15/105 take precedence
• CPC Class Codes: G01P 15/125 by capacitive pick-up
• CPC Class Codes: G01P 15/18 in two or more dimensions
• CPC Class Codes: G03B 17/00 Details of cameras or camera bodies; Accessories therefor lens hoods or caps G03B11/04
• CPC Class Codes: G03B 17/02 Bodies
• CPC Class Codes: G03B 2205/0007 Movement of one or more optical elements for control of motion blur imaging systems in general using optical elements for stabilisation of the position of the image G02B27/64
• CPC Class Codes: G03B 2217/005 Blur detection
• CPC Class Codes: G03B 5/02 Lateral adjustment of lens
• CPC Class Codes: G03B 5/04 Vertical adjustment of lens; Rising fronts
• CPC Class Codes: G03B 7/091 Digital circuits
• CPC Class Codes: H04N 23/60 Control of cameras or camera modules
• CPC Class Codes: H04N 23/6812 based on additional sensors, e.g. acceleration sensors
• CPC Class Codes: H04N 23/685 performed by mechanical compensation

Abstract

A control unit generates a first control signal for camera shake correction on the basis of a first acceleration detection signal, a second acceleration detection signal, and an angular velocity signal. The first acceleration detection signal including information relating to an acceleration acting on a camera and has an alternating current (AC) waveform corresponding to the acceleration. The second acceleration detection signal including information relating to the acceleration and has an output waveform. An AC component corresponding to the acceleration is superimposed on a direct current (DC) component in the output waveform. The angular velocity signal including information relating to an angular velocity acting on the camera.

Claims

1. A camera control device, comprising:

circuitry configured to;

acquire information associated with an angular velocity around an axis parallel to an optical axis of a camera, based on information associated with accelerations in directions of two axes orthogonal to the optical axis of the camera; and

generate a first control signal for a camera shake correction process based on a first acceleration detection signal, a second acceleration detection signal, and an angular velocity signal, wherein

the first acceleration detection signal including information associated with the accelerations in the directions of the two axes orthogonal to the optical axis of the camera,

the first acceleration detection signal has an alternating current (AC) waveform corresponding to the accelerations,

the second acceleration detection signal including information associated with the accelerations,

the second acceleration detection signal has an output waveform,

an AC component corresponding to the accelerations is superimposed on a direct current (DC) component in the output waveform, and

the angular velocity signal including information associated with angular velocities around the two axes.

2. The camera control device according to claim 1, wherein the circuitry is further configured to:

extract a dynamic acceleration component and a static acceleration component from the accelerations, based on the first acceleration detection signal and the second acceleration detection signal; and

generate the first control signal based on the angular velocity signal and the dynamic acceleration component.

3. The camera control device according to claim 2, wherein

the circuitry is further configured to generate a second control signal including information associated with a posture of the camera with respect to a horizontal direction based on the static acceleration component.

4. The camera control device according to claim 2, wherein

the circuitry is further configured to extract the static acceleration component from one of the accelerations, based on a difference signal between the first acceleration detection signal and the second acceleration detection signal.

5. The camera control device according to claim 4, wherein

the circuitry is further configured to adjust gain of each of the first acceleration detection signal and the second acceleration detection signal so that the first acceleration detection signal and the second acceleration detection signal are at a same level.

6. The camera control device according to claim 4, wherein the circuitry is further configured to:

compute a correction coefficient based on the difference signal; and

correct one of the first acceleration detection signal or the second acceleration detection signal by use of the correction coefficient.

7. The camera control device according to claim 1, further comprising:

an acceleration detection sensor including a movable portion, a piezoelectric first acceleration detection sensor, and a non-piezoelectric second acceleration detection sensor, wherein

the movable portion is movable upon reception of the accelerations,

the piezoelectric first acceleration detection sensor is on the movable portion to output the first acceleration detection signal, and

the non-piezoelectric second acceleration detection sensor is on the movable portion to output the second acceleration detection signal.

8. The camera control device according to claim 7, wherein

the second acceleration detection sensor includes a piezoresistive acceleration detection device.

9. The camera control device according to claim 7, wherein

the second acceleration detection sensor includes a capacitive acceleration detection device.

10. An imaging device, comprising:

an imaging device;

a lens configured to form an image of a subject luminous flux on the imaging device;

an acceleration detection sensor configured to output a first acceleration detection signal, a second acceleration detection signal, and an angular velocity signal, wherein

the first acceleration detection signal including information associated with the accelerations in directions of two axes orthogonal to an optical axis of a camera,

the first acceleration detection signal has an alternating current (AC) waveform corresponding to the accelerations,

the second acceleration detection signal including information associated with the accelerations,

the second acceleration detection signal has an output waveform,

an AC component corresponding to the accelerations is on a direct current (DC) component in the output waveform, and

the angular velocity signal including information associated with angular velocities around the two axes; and

circuitry configured to;

acquire information associated with an angular velocity around an axis parallel to the optical axis of the camera based on information associated with the accelerations in the directions of the two axes orthogonal to the optical axis of the camera; and

generate a control signal for a camera shake correction process based on the angular velocity signal, the first acceleration detection signal, and the second acceleration detection signal.

11. The imaging device according to claim 10, further comprising:

a driving unit configured to move one of the lens or the imaging device based on the control signal.

12. The imaging device according to claim 10, further comprising:

an electronic camera shake correction image processing circuit configured to generate a camera shake correction image based on the control signal.