Anti-shake apparatus
View Patent ↗An anti-shake apparatus of a photographing apparatus comprises a hand-shake quantity detector and a controller. The hand-shake quantity detector has a first detector having an angular velocity sensor and has a second detector having an angular displacement sensor. The controller performs an anti-shake operation based on a first angular signal from the first detector and a second angular signal from the second detector.
1. An anti-shake apparatus of a photographing apparatus, comprising:
a hand-shake quantity detector that has a first detector having an angular velocity sensor and that has a second detector having an angular displacement sensor, said angular displacement sensor comprising an inclination angular sensor that detects an inclination angle of a pendulum, said first detector has an integration unit and a high-pass filter unit that removes a low-frequency component of a signal output from said angular velocity sensor to obtain a high-frequency signal from which said low-frequency component has been removed, and said second detector has a hold unit and a low-pass filter unit that removes a high-frequency component of a signal output from said angular displacement sensor to obtain a low-frequency signal from which said high-frequency component has been removed,
said integration unit integrating said high-frequency signal and generating a first angular signal based on the integrated high-frequency signal; and
said hold unit holding a value output from said low-pass filter unit based on said low-frequency signal at an anti-shake operation base time and outputting a second angular signal based on a differential between the value held by said hold unit and a value output from said low-pass filter unit based on said low-frequency signal at a time after said anti-shake operation base time,
wherein a cutoff frequency of said high-pass filter unit and a cutoff frequency of said low-pass filter unit have the same value;
a controller that performs an anti-shake operation based on said first angular signal from said first detector and said second angular signal from said second detector, said controller specifies a hand-shake quantity based on a total value between said first angular signal and said second angular signal, and performs said anti-shake operation based on said total value.
2. The anti-shake apparatus according to claim 1 , wherein said cutoff frequency of said high-pass filter unit and said low-pass filter unit is set to a value corresponding to a maximum value of a response frequency of said angular displacement sensor.
3. The anti-shake apparatus according to claim 2 , wherein said cutoff frequency of said high-pass filter unit and said low-pass filter unit is within a range of from 2 to 3 Hz.
4. The anti-shake apparatus according to claim 1 , wherein said pendulum has a magnet and a hall sensor that detects a quantity of a magnetic field, between said magnet and said hall sensor, that changes in correspondence with a swing of said pendulum.
5. The anti-shake apparatus according to claim 1 , wherein said angular velocity sensor has a yawing angular velocity sensor and a pitching angular velocity sensor, and said angular displacement sensor has at least one of either a yawing angular sensor or a pitching angular sensor;
said yawing angular velocity sensor detecting an angular velocity based on a yawing motion;
said pitching angular velocity sensor detecting an angular velocity based on a pitching motion;
said yawing angular sensor detecting an inclination angle based on said yawing motion; and
said pitching angular sensor detecting an inclination angle based on said pitching motion.
6. The anti-shake apparatus according to claim 5 , wherein said angular velocity sensor has a rolling angular velocity sensor that detects an angular velocity based on a rolling motion, and said angular displacement sensor has at least one of said yawing angular sensor, said pitching angular sensor and a rolling angular sensor that detects an inclination angle based on said rolling motion.
7. A photographing apparatus comprising:
a hand-shake quantity detector that has a first detector having an angular velocity sensor and that has a second detector having an angular displacement sensor, said angular displacement sensor comprising an inclination angular sensor that detects an inclination angle of a pendulum, said first detector has an integration unit and a high-pass filter unit that removes a low-frequency component of a signal output from said angular velocity sensor to obtain a high-frequency signal from which said low-frequency component has been removed, and said second detector has a hold unit and a low-pass filter unit that removes a high-frequency component of a signal output from said angular displacement sensor to obtain a low-frequency signal from which said high-frequency component has been removed,
said integration unit integrating said high-frequency signal and generating a first angular signal based on the integrated high-frequency signal; and said hold unit holding a value output from said low-pass filter unit based on said low-frequency signal at an anti-shake operation base time and outputting a second angular signal based on a differential between the value held by said hold unit and a value output from said low-pass filter unit based on said low-frequency signal at a time after said anti-shake operation base time,
wherein a cutoff frequency of said high-pass filter unit and a cutoff frequency of said low-pass filter unit have the same value;
a controller that performs an anti-shake operation based on said first angular signal from said first detector and said second angular signal from said second detector said controller specifies a hand-shake quantity based on a total value between said first angular signal and said second angular signal, and performs said anti-shake operation based on said total value.
8. The photographing apparatus according to claim 7 , further comprising an operating unit; and
said anti-shake operation base time being set in correspondence with an operation of said operation unit.
9. The photographing apparatus according to claim 8 , said operation unit is a release button, and said anti-shake operation base time is a time when a control of exposure is started in response to operation of said release button.
10. The anti-shake apparatus according to claim 7 , wherein said cutoff frequency of said high-pass filter unit and said low-pass filter unit is set to a value corresponding to a maximum value of a response frequency of said angular displacement sensor.
11. The anti-shake apparatus according to claim 10 , wherein said cutoff frequency of said high-pass filter unit and said low-pass filter unit is within a range of from 2 to 3 Hz.
12. The anti-shake apparatus according to claim 7 , wherein said pendulum has a magnet and a hall sensor that detects a quantity of a magnetic field, between said magnet and said hall sensor, that changes in correspondence with a swing of said pendulum.
13. The anti-shake apparatus according to claim 7 , wherein said angular velocity sensor has a yawing angular velocity sensor and a pitching angular velocity sensor, and said angular displacement sensor has at least one of either a yawing angular sensor or a pitching angular sensor;
said yawing angular velocity sensor detecting an angular velocity based on a yawing motion;
said pitching angular velocity sensor detecting an angular velocity based on a pitching motion;
said yawing angular sensor detecting an inclination angle based on said yawing motion; and
said pitching angular sensor detecting an inclination angle based on said pitching motion.
14. The anti-shake apparatus according to claim 13 , wherein said angular velocity sensor has a rolling angular velocity sensor that detects an angular velocity based on a rolling motion, and said angular displacement sensor has at least one of said yawing angular sensor, said pitching angular sensor and a rolling angular sensor that detects an inclination angle based on said rolling motion.