Image blur prevention device for camera
First Claim
1. An image blur prevention device for a camera, comprising:
- means for detecting a camera shake state during an exposure sequence after a release operation, and outputting a shake signal;
means for outputting a first exposure start signal upon detecting that the shake signal is smaller than a predetermined value;
timer means for counting an elapsed time from an exposure sequence start, and generating a second exposure start signal when a predetermined timer time has elapsed; and
exposure start means for starting an exposure operation in response to one of the first and second exposure start signals which is output first.
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Accused Products
Abstract
In an image blur prevention device for a camera, the limit delay time for image blur reduction is set to be changeable so as to reduce the influences of camera shakes on photographing operations, so as to realize high operability. A shake determining section determines the image blur state on the current image plane on the basis of the camera shake state detected by a shake detecting section. As a result, information corresponding to the level of the current image blur state is sent to an exposure control section. On the basis of image blur state information from the shake determining section when an exposure start instruction signal is received, limit delay time information set in a limit delay time setting section, and the count result obtained by a timer section, the exposure control section determines whether to start an exposure operation in accordance with the state of a release operating section. If it is determined that exposure should be started, a shutter unit is driven by a shutter drive section to perform an exposure operation. If it is determined that exposure should not be started, the shutter drive section is stopped, and no exposure operation is performed.
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Citations
29 Claims
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1. An image blur prevention device for a camera, comprising:
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means for detecting a camera shake state during an exposure sequence after a release operation, and outputting a shake signal; means for outputting a first exposure start signal upon detecting that the shake signal is smaller than a predetermined value; timer means for counting an elapsed time from an exposure sequence start, and generating a second exposure start signal when a predetermined timer time has elapsed; and exposure start means for starting an exposure operation in response to one of the first and second exposure start signals which is output first. - View Dependent Claims (2)
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3. An image blur prevention device for a camera, comprising:
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shake detecting means for detecting a camera shake state; shake determining means for determining a camera shake state on the basis of an output from said shake detecting means; release operating means for instructing a photographing operation of the camera; exposure control means for controlling an exposure operation start timing of the camera in accordance with a determination result obtained by said shake determining means and an operation state of said release operating means; delay time setting means for, when a photography start signal is input from said release operating means, setting a wait time for a photographing operation start and outputting the set time to said exposure control means; and timer means for counting an elapsed time after the photography start signal from said release operating means is input, wherein a count result obtained by said timer means is compared with the time set by said delay time setting means to determine whether to delay an exposure operation start timing of the camera. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An image blur prevention device for a camera, which detects a camera shake state and prevents influences of a shake in an exposure operation, comprising:
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setting means for setting a shutter speed of the camera; detecting means for detecting a camera shake and outputting a shake state signal; a manual operating member for instructing a shift from a preparatory photographing operation to an exposure operation; timer means for counting an elapsed time after said manual operating member is operated; and control means for starting an exposure operation in accordance with an operation of said manual operating member when said timer means finishes counting a predetermined time set in accordance with the shutter speed, or a level of the shake state signal becomes not higher than a predetermined level. - View Dependent Claims (16)
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17. An image blur prevention device for a camera, which can detect a camera shake state, comprising:
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means for determining a shutter speed of the camera; detecting means for detecting a camera shake state and outputting a shake state signal; a manual operating member for instructing a shift from a preparatory photographing operation to an exposure operation; timer means for counting an elapsed time after said manual operating member is operated; and control means for setting a limit delay time between the instant at which said manual operating member is operated and the instant at which an exposure operation is started, in accordance with the shutter speed, and for starting an exposure operation in accordance with an operation of said manual operating member when the shutter speed falls within a predetermined range, and said timer means finishes counting the limit delay time, or when a level of the shake state signal becomes not higher than a predetermined level. - View Dependent Claims (18, 19)
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20. An image blur prevention device for a camera, which can detect a camera shake, comprising:
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means for setting a photographing operation mode of the camera; means for detecting a focal length of a photographing lens; means for determining a shutter speed of the camera; a manual operating member for instructing a shift from a preparatory photographing operation to an exposure operation; timer means for counting an elapsed time after said manual operating member is operated; and control means for setting a limit delay time between the instant at which said manual operating member is operated and the instant at which an exposure operation is started, in accordance with at least one of the shutter speed, the focal length, and the photographing operation mode, and for starting an exposure operation after an operation of said manual operating member when said timer means finishes counting the limit delay time, or when a level of the shake state signal becomes not higher than a predetermined level. - View Dependent Claims (21, 22)
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23. An image blur prevention device for a camera, comprising:
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shake detecting means for detecting a camera shake; exposure instructing means for instructing the camera to perform film exposure; first exposure permitting means for outputting a first exposure permission signal for permitting film exposure in accordance with the shake state; second exposure permitting means for outputting a second exposure permission signal for permitting film exposure a predetermined time after an exposure instruction is output from said exposure instructing means; and control means for performing film exposure on the basis of at least one of an output from said exposure instructing means, an output from said first exposure permitting means, and an output from said second exposure permitting means. - View Dependent Claims (24, 25, 26, 27)
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28. An image blur prevention device for a camera, comprising:
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means for outputting a first exposure signal when a shake becomes not more than a predetermined value after an exposure sequence start; means for counting time in response to the exposure sequence start, and outputting a second exposure signal when a predetermined time has elapsed; and means for starting an exposure operation on the basis of at least one of the first and second exposure signals.
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29. An image blur prevention device for a camera, comprising:
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shake detecting means; shake determining means for receiving an output from said shake detecting means and determining a level of a shake; release operating means; control means for controlling an exposure start timing on the basis of an output from said shake determining means and a state of said release operating means; shutter means for performing an exposure operation in response to an output from said control means; timer means for counting an elapsed time after said release operating means is operated; setting means for setting a wait time between the instant at which said release operating means is operated and the instant at which said shutter means operates; and means for comparing the count result obtained by said timer means with the wait time set by said setting means, and determining an exposure start timing in accordance with the comparison result in preference to said control means.
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Specification