Camera having camera-shake detecting device

• US 5,198,856 A
• Filed: 01/31/1991
• Issued: 03/30/1993
• Est. Priority Date: 02/05/1990
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Akashi, Akira, Odaka, Yukio
• Primary Examiner(s): ADAMS JR, RUSSELL E
• Application Number:
  US07/648,835
• Time in Patent Office: 789 Days
• Field of Search: 354/430, 354/435, 354/441-445, 354/465, 354/471, 354/474, 354/475, 354/289.12
• US Class Current: 396/54
• CPC Class Codes: G03B 17/00 Details of cameras or camera bodies; Accessories therefor lens hoods or caps G03B11/04
• CPC Class Codes: G03B 17/20 visible in viewfinder
• CPC Class Codes: G03B 2217/005 Blur detection

Abstract

A camera having a camera-shake detecting device is arranged to make a display indicating that a shake of the camera is undetectable only in cases where the camera shake is consecutively found to be undetectable for a given number of times while a camera-shake detecting action is repeatedly performed. This arrangement effectively prevents the display from being flickered by alternate displays of an undetectable state and a detectable state if the undetectable state is displayed every time the undetectable state of camera shake takes place.

Claims

1. A camera having a camera-shake detecting device, comprising:

a) a shake detecting circuit provided with a sensor for detecting a shake of the camera;

b) a determining circuit arranged to determine whether a shake detecting action of said shake detecting circuit can be adequately performed; and

c) indication means for indicating that said shake detecting action is not performed when said determining circuit has determined that said shake detecting action cannot be adequately performed.

2. A camera according to claim 1, further comprising an indication circuit arranged to cause said indication means to indicate that said shake detecting action is not performed when said determining circuit has continuously determined for a predetermined period of time that said shake detecting action cannot be adequately performed.

3. A camera according to claim 1, further comprising an indication circuit arranged to cause said indication means to indicate that said shake detecting action is not performed when said determining circuit has consecutively determined for a predetermined number of times that said shake detecting action cannot be adequately performed.

4. A camera according to claim 2, further comprising a warning circuit arranged to give warning of a camera shake on the basis of the shake of the camera detected by said shake detecting circuit.

5. A camera according to claim 3, further comprising a warning circuit arranged to give warning of a camera shake on the basis of the shake of the camera detected by said shake detecting circuit.

6. A camera according to claim 2, wherein said sensor is a light receiving sensor arranged to receive light of an object image, and wherein said determining circuit is arranged to determine said shake detecting action cannot be adequately performed when an output of said sensor is in a predetermined state.

7. A camera according to claim 3, wherein said sensor is a light receiving sensor arranged to receive light of an object image, and wherein said determining circuit is arranged to determine said shake detecting action cannot be adequately performed when an output of said sensor is in a predetermined state.

8. A camera according to claim 1, further comprising a computing circuit arranged to obtain, on the basis of the shake of the camera detected by said shake detecting circuit, a shutter speed which causes no camera shake.

9. A camera according to claim 3, further comprising a computing circuit arranged to obtain, on the basis of the shake of the camera detected by said shake detecting circuit, a shutter speed which causes no camera shake.

10. A camera comprising:

a) a shake detecting circuit provided with a sensor for detecting a presently occurring shake parameter experienced by the camera and providing an output indicative of the detected shake parameter;

b) a camera-shake preventing time computing circuit arranged to obtain, on the basis of said output of said shake detecting circuit, a first shutter time which causes no camera shake;

c) a light measuring circuit for providing an output indicative of presently measured brightness of an object scene;

d) computing circuit means providing output indication of a second shutter time responsively to said output of said light measuring circuit and a predetermined maximum aperture value; and

an indication circuit arranged to provide output indication when said first shutter time obtained by said computing circuit is shorter than said second shutter time.

11. A camera according to claim 10, further comprising a shutter control circuit arranged to set a shutter time at said first shutter time when said first shutter time is longer than said second shutter time and at said second shutter time when said first shutter time is shorter than said second shutter time.

12. A camera comprising:

a) a shake detecting circuit arranged to repeatedly detect a shake of the camera;

b) a computing circuit arranged to obtain, on the basis of a detection output of said shake detecting circuit every time the shake of the camera is detected by said shake detecting circuit, a shutter time which causes no camera shake;

c) a display circuit for displaying said shutter time obtained by said computing circuit;

d) a determining circuit arranged to determine whether a shake of the camera is in an undetectable state every time a shake detecting action of said shake detecting circuit is performed; and

e) a keeping circuit arranged to keep a display made by said display circuit at a shutter time value obtained by said computing circuit in a preceding shake detecting action when said determining circuit has determined that the shake of the camera is in an undetectable state.

13. A camera having a shake detecting device, comprising:

a) a detecting circuit having a sensor to detect a blur of the camera, said detection circuit being arranged to repeat the detecting action;

b) a determining circuit for determining whether the blur detecting action is performed adequately; and

c) an output circuit for generating an output when the determining circuit determines that the blur detecting action of the detecting circuit is not performed adequately successively for a predetermined period of time or for a predetermined number of detection actions.

14. A camera having a shake detecting device, comprising:

a) a shake detecting circuit provided with a sensor for detecting a shake of the camera;

b) a determining circuit arranged to determine whether a shake detecting action of said shake detecting circuit is adequately performed, and

c) indication means arranged to differentiate its indication between when the determining circuit determines that the shake determining action is performed adequately and when the determining circuit determines the detecting action is not performed adequately.

15. A camera comprising:

a) a shake detecting circuit provided with a sensor for detecting a presently occurring shake parameter experienced by the camera and providing an output indicative of the detected shake parameter;

b) a camera-shake preventing time computing circuit arranged to obtain, on the basis of said output of said shake detecting circuit, a first shutter time which causes no camera shake;

c) a light measuring circuit for providing an output indicative of presently measured brightness of an object scene;

d) computing circuit means providing output indication of a second shutter time responsively to said output of said light measuring circuit; and

e) an indication circuit arranged to provide an output indication when said first shutter time obtained by said computing circuit is shorter than said second shutter time, which is determined for a correct exposure on the basis of a maximum aperture value and said output of said light measuring circuit.

16. A camera according to claim 15, further comprising a shutter control circuit arranged to set a shutter time at said first shutter time when said first shutter time is longer than said second shutter time and at said second shutter time when said first shutter time is shorter than said second shutter time.