Anti-shake camera

• US 5,790,490 A
• Filed: 05/09/1997
• Issued: 08/04/1998
• Est. Priority Date: 05/10/1996
• Status: Expired due to Term

• Current Assignee: Olympus Optical Corporation Limited (Olympus Corporation)
• Original Assignee: Olympus Optical Corporation Limited (Olympus Corporation)
• Inventors: Yaji, Tsuyoshi, Satoh, Tatsuya
• Primary Examiner(s): PERKEY, WILLIAM B
• Application Number:
  US08/853,269
• Time in Patent Office: 452 Days
• Field of Search: 396/52-55, 396/266
• US Class Current: 396/52
• CPC Class Codes: G03B 17/00 Details of cameras or camera bodies; Accessories therefor lens hoods or caps G03B11/04
• CPC Class Codes: G03B 2217/005 Blur detection
• 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 23/684 performed by controlling the image sensor readout, e.g. by controlling the integration time

Abstract

An anti-shake camera measures a shaking movement of the camera around at least a first dimension and around a second dimension (e.g., X and Y dimensions). Based on these measured camera shake values, the anti-shake camera generates a forecasted camera shake value for each measured dimension of motion. When both of these forecasted camera shake values achieves a predetermined level, such as zero, within a predetermined time, the anti-shake camera begins an exposure operation.

Claims

1. An anti-shake camera, comprising:

a plurality of shake condition detectors, each shake condition detector detecting shake condition signals corresponding to a camera shake condition value in one of a plurality of different directions;

shake condition forecasting means for forecasting a shake condition value for each of the directions in accordance with the detecting signals from each one of the plurality of shake condition detectors;

detecting means for detecting when each forecast shake condition value achieves a corresponding one of a plurality of predetermined levels;

judgment means for judging if each forecast shake condition value achieves the corresponding predetermined level within a predetermined time, the judgment means producing an activation signal if each forecast shake condition value achieves the corresponding predetermined level within the predetermined time; and

exposure control means for controlling an exposure operation according to the activation signal from the judgment means.

2. The anti-shake camera according to claim 1, further comprising a counter means for counting to the predetermined time, wherein the counter means begins counting to the predetermined time when at least one of the forecast shake condition values achieves the corresponding predetermined level.

3. The anti-shake camera according to claim 1, wherein the shake condition forecast means forecasts each shake condition value at predetermined intervals.

4. The anti-shake camera according to claim 1, wherein the predetermined time is set to be no more than an exposure time.

5. The anti-shake camera according to claim 1, wherein each of the predetermined levels is zero.

6. The anti-shake camera according to claim 1, wherein each of the directions is perpendicular to an optical axis of the camera, and wherein the directions cross each other perpendicularly.

7. An anti-shake camera, comprising:

image moving speed detecting means for detecting a moving speed of an image in a plurality of different directions and for producing for each direction a value indicative of the moving speed of the image detected along a corresponding one of the plurality of directions;

level detect means for detecting if each value achieves a corresponding one of a plurality of predetermined levels;

judgment means for judging if each value achieves the corresponding predetermined level, the judgment means producing an activation signal if each value achieves the corresponding predetermined level within a predetermined time; and

exposure control means for controlling an exposure operation according to the activation signal from the judgment means.

8. The anti-shake camera according to claim 7, further comprising a counter means for counting to the predetermined time, wherein the counter means begins counting to the predetermined time when at least one of the values achieves the corresponding predetermined level.

9. The anti-shake camera according to claim 7, wherein the predetermined time is no more than an exposure time.

10. The anti-shake camera according to claim 7, wherein the predetermined time is counted by a timer function in a CPU.

11. An anti-shake camera, comprising:

a first shake condition detector for detecting a shake condition for a first direction;

a second shake condition detector for detecting a shake condition for a second direction;

a first shake forecaster for forecasting the shake condition for the first direction based on an output from the first shake condition detector;

a second shake forecaster for forecasting the shake condition for the second direction based on an output from the second shake condition;

a first shake level detector for detecting if the level of the shake forecasted by the first shake forecaster achieves a first predetermined level;

a second shake level detector for detecting if the level of the shake forecasted by the second shake forecaster achieves a second predetermined level;

judgment means for judging, based on an output of the first shake level detector and on an output of the second shake level detector, if the level of the shake detected by the first shake level detector achieves the first predetermined level within a predetermined time and if the level of the shake detected by the second shake level detector achieves the second predetermined level within the predetermined time; and

exposure control means for controlling an exposure operation according to an output from said judgment means.

12. The anti-shake camera according to claim 11, further comprising a counter means for counting to the predetermined time, wherein the counter means begins accounting to the predetermined time when at least one of the level of the shake forecasted by the first shake forecaster and the level of the shake forecasted by the second shake forecaster achieves a corresponding one of the first predetermined level and the second predetermined level.

13. The anti-shake camera according to claim 11, wherein the predetermined time is no more than an exposure time.

14. The anti-shake camera according to claim 11, wherein the first predetermined level is the same as the second predetermined level.