Shooting lens having vibration reducing function and camera system for same
First Claim
1. A shooting lens for forming an image of a subject on an imaging plane of a camera, the shooting lens comprising:
- a vibration reduction mechanism for reducing a vibration of the image of the subject;
a vibration detecting part which detects a vibration of the camera and outputs a vibration detection signal;
an information obtaining part which acquires information on a motion signal obtained by analyzing an image shot with the camera; and
a controlling part which controls, using the vibration detection signal, the vibration reduction mechanism to perform feedforward operation and controls, using the motion signal, the vibration reduction mechanism to perform feedback operation, thereby reducing the image vibration; and
a center bias part which biases the vibration reduction mechanism to a center position by feeding back displacement of the vibration reduction mechanism from the center position to the control over the vibration reduction mechanism; and
whereinthe controlling part decreases a feedback gain of the motion signal as a feedback gain of the center bias part increases, and increases the feedback gain of the motion signal as the feedback gain of the center bias part decreases.
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Abstract
The invention includes a vibration reduction mechanism, a vibration detecting part, a reference signal generating part, a target drive position calculating part, and a driving part. The vibration reduction mechanism reduces a vibration of a subject image. The vibration detecting part outputs a vibration detection signal. The reference signal generating part estimates a reference signal of the vibration detection part. The target drive position calculating part obtains a vibration component from a difference between the vibration detection signal and the estimated reference signal to obtain a target position to which the vibration reduction mechanism is driven. The driving part controls the vibration reduction mechanism to follow the target position. Particularly, the reference signal generating part corrects the reference signal according to a motion signal obtained from a captured image. An accurate reference signal can be obtained by the correction, thereby improving the performance of the vibration reduction.
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Citations
6 Claims
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1. A shooting lens for forming an image of a subject on an imaging plane of a camera, the shooting lens comprising:
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a vibration reduction mechanism for reducing a vibration of the image of the subject; a vibration detecting part which detects a vibration of the camera and outputs a vibration detection signal; an information obtaining part which acquires information on a motion signal obtained by analyzing an image shot with the camera; and a controlling part which controls, using the vibration detection signal, the vibration reduction mechanism to perform feedforward operation and controls, using the motion signal, the vibration reduction mechanism to perform feedback operation, thereby reducing the image vibration; and a center bias part which biases the vibration reduction mechanism to a center position by feeding back displacement of the vibration reduction mechanism from the center position to the control over the vibration reduction mechanism; and
whereinthe controlling part decreases a feedback gain of the motion signal as a feedback gain of the center bias part increases, and increases the feedback gain of the motion signal as the feedback gain of the center bias part decreases. - View Dependent Claims (2, 3)
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4. A shooting lens for forming an image of a subject on an imaging plane of a camera, the shooting lens comprising:
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a vibration reduction mechanism for reducing a vibration of the image of the subject; a vibration detecting part which detects a vibration of the camera and outputs a vibration detection signal; an information obtaining part which acquires information on a motion signal obtained by analyzing an image shot with the camera; and a controlling part which controls, using the vibration detection signal, the vibration reduction mechanism to perform feedforward operation and controls, using the motion signal, the vibration reduction mechanism to perform feedback operation, thereby reducing the image vibration, wherein for stopping the vibration reduction by the vibration reduction mechanism, the controlling part controls the vibration reduction mechanism to stop the feedback operation before stopping the feedforward operation. - View Dependent Claims (5, 6)
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Specification