Camera shake correction system
AssigneeFjui Photo Film Co., Ltd.
InventorsAtsushi Misawa, Kazuo Ikari, Satoshi Ueda
Life of this patent
Estimating the term…
Abstract
A camera shake correction system which corrects the shaking of a picture image caused by the shake of a camera. In the camera shake correction system, a mirror is supported in front of a taking lens in such a manner that the mirror is free to incline about an angle of 45.degree. with respect to the optical axis of the taking lens, and the mirror is inclined at a half of the angular speed of the camera in the opposite direction to the shaking direction of the camera in accordance with the detection output of a shake sensor for detecting the shake of the camera, thereby stabilizing an object light incident on the image pickup surface of the camera.
Claims18
A camera shake correction system, comprising:
- a mirror;
- a mirror support mechanism for supporting said mirror in front of a taking lens of a camera in such a manner that said mirror is inclined about an angle of about 45.degree. with respect to the optical axis of said taking lens;
- a mirror drive means for inclining said mirror;
- a shake sensor for detecting the shake of said camera;
- and,
- a control means, in accordance with the detection output of said shake sensor, for controlling said mirror drive means so as to stabilize an object light incident on the image pickup surface of said camera.
A camera shake correction system as set forth, comprising:
- a mirror;
- a mirror support mechanism for supporting said mirror in front of a taking lens of a camera in such a manner that said mirror is inclined about an angle of about 45.degree. with respect to the optical axis of said taking lens, and;
- a mirror drive means for inclining said mirror;
- a shake sensor having photo-electric conversion elements disposed in the neighborhood of said taking lens, and an optical system for forming on said photo-electric conversion elements the image of an object light entering through said mirror;
- and,
- a control means, in accordance with the detection output of said shake sensor, for calculating the amount of movements of an object light formed on said photo-electric conversion elements of said shake sensor every until time, and for controlling said mirror drive means so that said amount of movements of said object light can be zero.
A camera shake correction system, comprising:
- a camera shake correction part comprising a first mirror, a mirror support mechanism for supporting said first mirror in such a manner that said first mirror is inclined about an angle of about 45.degree. with respect to the optical axis of a taking lens, a mirror drive means for inclining said first mirror, a shake sensor for detecting the sake of a camera, and a control means, in accordance with the detection output of said shake sensor, for controlling said mirror drive means so as to stabilize an object light incident on the image pickup surface of said camera;
- a wide converter part having a second mirror disposed at an angle of about 45.degree. with respect to the optical axis of said taking lens for widening the picture angle of said taking lens;
- and,
- a switching unit containing therein said camera shake correction part and wide converter part, disposed movably in front of said taking lens, and movable between a first position allowing an object light to enter said taking lens through said first mirror and a second position allowing an object light to enter said taking lens through said second mirror.
A camera shake correction system in which at least one of optical members of a photographing optical system of a camera is movably arranged, and said optical member is driven to stabilize an object light incident on an image pickup surface through the photographing optical system, said camera shake correction system comprising:
- a piezo-electric element for driving said optical member;
- an angular speed sensor for outputting a voltage signal proportional to the angular speed of said camera;
- and,
- an electric charge injection means, in accordance with the voltage signal output from said angular speed sensor, for injecting electric charges into said piezo-electric element so that the amount of electric charges to be injected per unit time is proportional to the magnitude of said voltage signal.
A camera shake correction system in which at least one of optical member of a photographing optical system of a camera is movably arranged, and said optical member is driven in such a manner that said optical member is rotated respectively in first rotational direction (X direction) and in a second rotational direction (Y direction) about two axes intersecting perpendicularly with an optical axis and with each other, said camera shake correction system comprising:
- first and second piezo-electric elements for driving said optical member respectively in said X and Y directions;
- first and second angular speed sensors respectively for outputting first and second voltage signals respectively proportional to the angular speed in said X and Y directions of said camera;
- a signal process means for processing two systems in the X and Y directions, said signal process means inputting alternately every predetermined cycle first and second voltage signals respectively output from said first and second angular speed sensors, finding first and second electric charge injection amount information in accordance with said input first and second voltage signals so that the amounts of electric charges injected into said first and second piezo-electric elements per unit time are respectively proportional to said first and second voltage signals, and outputting said first and second electric charge injection amount information alternately;
- and,
- first and second pulse electric charge injection means, when said first and second electric charge amount information output from said signal process means is input thereinto, for injecting on pulse electric charges corresponding to said input first and second electric charges amount information into said first and second piezo-electric element until the next first and second electric charge amount information is input, respectively.
In a camera shake correction system in which at least one optical member of a photographing optical system of a camera is movably arranged and said optical member is driven in accordance with the detection output of a shake sensor for detecting the shake of the camera to stabilize an object light incident on an image pickup surface through the photographing optical system, said shake sensor comprising:
- an angular speed sensor using a Coriolis Force;
- an average value detection means for finding the average value of the outputs of said angular speed sensor within a predetermined time shorter than the cycle of a drift component contained in the output of said angular speed sensor and longer than the cycle of the angular speed of said camera shake to be detected;
- and, a subtraction means for subtracting the average value found by said average value detection means from the output of said angular speed sensor and outputting the resultant value.
A camera shake correction system in which at least one optical member of a photographing system of a camera is movably arranged and said optical system is driven to stabilize an object light incident on an image pickup surface through the photographing system, said camera shake correction system comprising:
- a piezo-electric element for driving said optical member;
- an angular speed sensor for outputting a voltage signal proportional to the angular speed of said camera;
- decision means for deciding whether the voltage signal output from said angular speed sensor is equal to or less than a predetermined threshold value to indicate that no camera shake correction is required;
- and,
- an electric charge injection means, if the voltage signal output from said angular speed sensor is found more than said predetermined threshold value, for injecting electric charges into said piezo-electric element in accordance with said voltage signal so that the amount of electric charges injected per unit time is proportional to the magnitude of said voltage signal, and, if said voltage signal is found equal to or less than said predetermined threshold value, for injecting positive and negative slight electric charges alternately into said piezo-electric element.
Dependencies are inferred from the claim text.