Patent
1989-01-31
1990-06-26
Perkey, W. B.
G03B 500
Patent
active
049376020
ABSTRACT:
A drive control device for controlling a zoom lens of a camera comprising: a zoom lens arranged on an optical axis; a motor for driving the zoom lens; a first controller for controlling a first zooming function wherein the zoom lens is moved at a relatively slow normal speed; a first trigger for starting the first zooming function only when the first trigger is being manipulated. The device further comprises a focal distance detector for detecting the position of the zoom lens on the optical axis; a first detector which detects a longest distance state wherein the zoom lens is positioned at a maximum focal point; a second detector which detects a shortest distance state wherein the zoom lens is positioned at a minimum focal point and which outputs a signal of the minimum focal position corresponding to the shortest distance state; a second controller for controlling a second zooming function of the camera wherein the zoom lens is moved at a speed far fastener than the normal speed by the motor; and a second trigger for starting the second zooming function. When the second trigger is manipulated, the zoom lens is automatically driven to move to the maximum focal position or to the minimum focal position irrespective of the length of the manipulation time of the second trigger.
REFERENCES:
patent: 3834796 (1974-09-01), Komine
patent: 4496229 (1985-01-01), Ogasawara
Himuro Keiji
Mitsu Shigeru
Perkey W. B.
Ricoh & Company, Ltd.
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