ANTI-SHAKE APPARATUS

• US 20070196085A1
• Filed: 02/16/2007
• Published: 08/23/2007
• Est. Priority Date: 02/20/2006
• Status: Active Grant

• Current Assignee: PENTAX RICOH IMAGING COMPANY, LTD.
• Original Assignee: Pentax Corporation (Hoya Corporation)
• Inventors: ENOMOTO, Shigeo
• Granted Patent: US 7,689,107 B2
• Time in Patent Office: Days
• US Class Current: 396/55
• CPC Class Codes: G03B 5/02 Lateral adjustment of lens
• CPC Class Codes: H04N 23/68 for stable pick-up of the scene, e.g. compensating for camera body vibrations
• CPC Class Codes: H04N 23/6812 based on additional sensors, e.g. acceleration sensors
• CPC Class Codes: H04N 23/6815 by distinguishing pan or tilt from motion
• CPC Class Codes: H04N 23/685 performed by mechanical compensation

Abstract

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.

Claims

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; and

a controller that performs an anti-shake operation based on a first angular signal from said first detector and a second angular signal from said second detector.

2. The anti-shake apparatus according to claim 1, wherein said first detector has an integrated unit and a high-pass filter unit that removes a low-frequency element of a signal output from said angular velocity sensor to obtain a high-frequency signal that has had said low-frequency element removed, and said second detector has a hold unit and a low-pass filter unit that removes a high-frequency element of a signal output from said angular displacement sensor to obtain a low-frequency signal that has had said high-frequency element removed;

said integrated unit integrating said high-frequency signal and generating said first angular signal based on the integrated high-frequency signal; and

said hold unit holding an output value output from said low-pass filter unit based on said low-frequency signal at an anti-shake operation base time and outputting said second angular signal based on a differential between the held value by said hold unit and an output value output from said low-pass filter unit based on said low-frequency signal at a time after said anti-shake operation base time.

3. The anti-shake apparatus according to claim 2, wherein a cutoff frequency of said high-pass filter unit and a cutoff frequency of said low-pass filter unit have the same value.

4. The anti-shake apparatus according to claim 3, 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.

5. The anti-shake apparatus according to claim 4, wherein said cutoff frequency of said high-pass filter unit and said low-pass filter unit is from 2 to 3 Hz.

6. The anti-shake apparatus according to claim 1, wherein 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.

7. The anti-shake apparatus according to claim 1, wherein said angular displacement sensor is an inclination angular sensor that detects an inclination angle of a pendulum.

8. The anti-shake apparatus according to claim 1, wherein said angular displacement sensor is an inclination angular sensor that has a pendulum having a magnet and has a hall sensor that detects a quantity of a magnetic field, between said magnet and said hall sensor, that changes corresponding to a swing of said pendulum.

9. 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.

10. The anti-shake apparatus according to claim 9, 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.

11. 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; and

a controller that performs an anti-shake operation based on a first angular signal from said first detector and a second angular signal from said second detector.

12. The photographing apparatus according to claim 11,

further comprising an operating unit;

wherein said first detector has an integrated unit and a high-pass filter unit that removes a low-frequency element of a signal output from said angular velocity sensor to obtain a high-frequency signal that has had said low-frequency element removed, and said second detector has a hold unit and a low-pass filter unit that removes a high-frequency element of a signal output from said angular displacement sensor to obtain a low-frequency signal that has had said high-frequency element removed;

said integrated unit integrating said high-frequency signal and generating said first angular signal based on the integrated high-frequency signal; and

said hold unit holding an output value output from said low-pass filter unit based on said low-frequency signal at an anti-shake operation base time and outputting said second angular signal based on a differential between the held value by said hold unit and an output value output from said low-pass filter unit based on said low-frequency signal at a time after said anti-shake operation base time; and

said anti-shake operation base time being set corresponding to an operation of said operation unit.

13. The photographing apparatus according to claim 12, said operation unit is a release button, and said anti-shake operation base time is a time when a control of exposure is started corresponding to said operation of said release button.