Anti-shake apparatus

• US 7,689,107 B2
• Filed: 02/16/2007
• Issued: 03/30/2010
• Est. Priority Date: 02/20/2006
• Status: Expired due to Fees

• Current Assignee: PENTAX RICOH IMAGING COMPANY, LTD.
• Original Assignee: Hoya Corporation
• Inventors: Enomoto, Shigeo
• Primary Examiner(s): Koval; Melissa J
• Assistant Examiner(s): RHODES, JR, LEON W
• Application Number:
  US11/675,865
• Publication Number:
  US 20070196085A1
• Time in Patent Office: 1,138 Days
• Field of Search: 396/52, 396/53, 396/55, 79/13.9, 348/208.2, 348/208.3, 348/208.7
• US Class Current: 396/53
• 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, 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.