Photography – Having variable focal length of camera objective – Power zoom
Patent
1997-07-01
1999-03-23
Adams, Russell
Photography
Having variable focal length of camera objective
Power zoom
396 85, 396 87, 396135, 396136, G03B 1700
Patent
active
058872019
ABSTRACT:
In a camera driving stop apparatus, a motor serves as a driving source upon reception of a current. A driven unit performs a predetermined operation associated with driving of a camera by using the motor as the driving source. A pulse generator outputs a pulse in response to the operation of at least one of the motor and the driven unit. A position detector detects the current position of the driven unit by counting pulses output from the pulse generator. When the width of the pulse output from the pulse generator is equal to or larger than a first time, an energization unit energizes the motor for only a second time shorter than the first time. An energization stop unit stops energization of the motor for only a third time shorter than the first time. A forcible energization stop unit inhibits energization of the motor. A storage unit holds the target position of the driven unit. A controller compares the target position of the driven unit held in the storage unit with the current position detected by the position detector, alternately operates the energization unit and the energization stop unit when the target position and current position do not coincide with each other, and operates the forcible energization stop unit when target position and current position coincide with each other.
REFERENCES:
patent: 4568165 (1986-02-01), Ishibashi
patent: 4772909 (1988-09-01), Ogasawara
patent: 4777504 (1988-10-01), Akada et al.
patent: 4878077 (1989-10-01), Maeno et al.
Adams Russell
Olympus Optical Co,. Ltd.
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