Photography – With exposure objective focusing means – focusing aid – or... – Lens resetting
Patent
1997-08-06
1998-11-03
Perkey, W. B.
Photography
With exposure objective focusing means, focusing aid, or...
Lens resetting
396220, G03B 1332, G03B 700
Patent
active
058323198
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a system and method for driving an electronic shutter of a camera, and more particularly, to a system and method for driving an electronic shutter of a camera in which electronic shutter responsiveness is quick and the structure of the electronic shutter is simple.
FIELD OF THE INVENTION
Generally, the electronic shutter of a camera is structured such that it automatically connects an automatic focus control, which controls the zooming of a lens for focus control to a measured distance of a subject, and an automatic exposure control, which matches and controls an iris and shutter speed according to an appropriate amount of exposure for the subject.
The above electronic shutter for cameras is proposed in U.S. Pat. Nos. 4,918,480, 4,634,524, and 5,111,230 and Japanese patent No. 61-9632.
The above prior art have in common a focus control ring, which controls the zooming in/out of the lens for focus control according to the measured distance of the subject, and a locking device, which stops the rotation of the focus control ring when the lens for focus control has reached the focus location.
Also included are sector open/close means, which open and close a sector according to a suitable amount of exposure for the subject; an exposure control ring, which operates the sector open/close means to its fixed location; an initial fixed position control device, which returns the focus control ring and exposure control ring to a fixed position immediately following exposure; and a power source which operates the focus control ring and the locking device.
In the prior art as in the above, with regard to the zoom control driving method of the lens for focus control, the focus control ring gradually moves the lens for focus control from a minimum zoom location to a maximum zoom location and vice versa.
In the above, the minimum zoom location indicates the focus location of the lens for focus control in which the subject is at the farthest distance, and the maximum zoom location refers to the focus location of the lens for focus control in which the subject is at the closest distance.
Referring to FIG. 29, a driving sequence of an electronic shutter of U.S. Pat. No. 5,111,230 is illustrated. As can be seen in the drawing, the lens for focus control is zoomed out from the minimum zoom location (j) to the maximum zoom location (k) by the focus control point. After the lens for focus control is zoomed out to the measured distance (l), it is returned in the opposite direction to the minimum zoom location (j).
Recently, in order to improve the focus control functions of the electronic shutter, focus control steps are used from the minimum zoom location to the maximum zoom location are further multiplied.
Resulting from this use of further multiplied steps is the increase in focus control time, slowing the responsiveness of the electronic shutter. time, the time required to go from the beginning to the end (from the minimum zoom control location to the maximum zoom control location or vice excessive amount of time for focus control.
Also, in the prior art electronic shutter, a locking device is needed for stopping the rotation of the focus control ring when the focus control lens is zoomed out according to the measured distance of the subject, resulting in a complicated structure.
SUMMARY OF THE INVENTION
The present invention has been made in an effort to solve the above problems.
It is an object of the present invention to provide an electronic shutter driving method and device for a camera which, by shortening the moving distance of a focus control lens, zooming the focus control lens out according to a measured distance of a subject, and therefore reducing the amount of time used for focus control, improves the responsiveness of an electronic shutter.
It is another object of the present invention to provide an electronic shutter driving method and device for a camera which, by eliminating the use of a locking device, employed for stopping the rotation of a
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patent: 4634524 (1987-01-01), Huber
patent: 4758854 (1988-07-01), Saegusa
patent: 4918480 (1990-04-01), Hori
patent: 5111230 (1992-05-01), Kobayashi
patent: 5162834 (1992-11-01), Kichima
Perkey W. B.
Samsung Aerospace Industries Ltd.
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