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US 5,278,935 AGranted
Device for controlling moving body participating in photographing operation
AssigneeCanon Kabushiki Kaisha
InventorEtsuro Furutsu
Life of this patent
Estimating the term…
Abstract
A control device for a moving body such as a focusing lens or the like is arranged to vary time intervals at which a speed control action is performed on a motor according to a driving amount required for moving the moving body to a target position by means of the motor. The arrangement enables the device to prevent an adverse effect of vibrations, etc. and to accurately accomplish position control.
Claims9
A control device for a moving body driven by a motor, comprising:
- a detection circuit for detecting a position of said moving body relative to a target position;
- a speed control circuit for adjusting a driving speed of the motor toward a target speed, said speed control circuit determining a control value for controlling the driving speed of the motor on the basis of speed information of the motor and the target speed;
- a driving circuit for driving the motor at a speed corresponding to the control value determined by said speed control circuit;
- a designating circuit arranged to render said speed control circuit operative at every interval of a settable time interval;
- and
- a set circuit for setting the settable time interval in correspondence to the position of said moving body relative to the target position detected by said detection circuit.
3 more elements
A control device for a moving body driven by a motor comprising:
- a speed control circuit operable at a controllable interval for adjusting a driving speed of the motor toward a target speed, said speed control circuit determining a control value for controlling the driving speed of the motor on the basis of speed information of the motor monitored by a monitor circuit and on the basis of the target speed;
- a driving circuit for driving the motor at a speed corresponding to the control value determined by said speed control circuit;
- and
- a control circuit for controlling the interval at which said speed control circuit adjusts the driving speed, said control circuit controlling the interval to vary accordance with a driving amount required for moving said moving body to a target position.
1 more element
Dependencies are inferred from the claim text.