# US 5,278,935 A · Device for controlling moving body participating in photographing operation

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- Number: US 5,278,935 A
- Document ID: US5278935A
- Status: Granted
- Kind: A
- Application number: 07/859,248
- Filed: 1992-03-26
- Granted: 1994-01-11
- Earliest claimed: 1987-10-30
- Assignees: Canon Kabushiki Kaisha
- Inventors: Etsuro Furutsu
- Web page: https://patentgrep.com/patent/US5278935A

## CPC

- G05B 19/232: {with speed feedback only}
- G02B 7/28: Systems for automatic generation of focusing signals
- G05B 2219/35459: Knob, handle, handwheel delivers pulses, electronic handwheel, digipot
- G05B 2219/43179: Speed changes gradualy from constant value to zero
- G05B 2219/45178: Zoom, focus lens
- Y10S 388/912: Pulse or frequency counter
- G05B: CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS (systems for controlling or regulating non-electric variables G05D; systems for regulating electric or magnetic variables G05F; control devices or systems insofar as characterised by mechanical features only G05G)
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## 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.

## Claims

### Claim 1

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.

### Claim 2 (depends on 1)

A control device according to claim 1, wherein said detection circuit detects a driving amount necessary for said moving body to move to said target position.

### Claim 3 (depends on 1)

A control device according to claim 1, wherein said set circuit sets a shorter time interval as the driving amount detected by said detection circuit decreases.

### Claim 4 (depends on 2)

A control device according to claim 2, wherein said speed control circuit includes a target speed set circuit for setting the target speed, said target speed set circuit setting a lower target speed as the driving amount detected by said detection circuit decreases.

### Claim 5 (depends on 1)

A control device according to claim 1, wherein said speed control circuit includes a monitor circuit which detects the moving speed of the moving body to form the speed information of the motor, and a comparison circuit which compares the speed information from said monitor circuit with the target speed to output acceleration and deceleration information as the control value.

### Claim 6 (depends on 1)

A control device according to claim 1, wherein said motor is a vibration type motor.

### Claim 7 (depends on 1)

A control device according to claim 1, wherein said moving body is a focusing lens.

### Claim 8

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.

### Claim 9 (depends on 8)

A control device according to claim 8, wherein the monitor circuit detects the moving speed of the moving body to form the speed information of the motor.