Actuator driving circuit, an actuator driving device, and an actuator driving method
AssigneeMinolta Co., Ltd.
InventorKoutaro Kawabe
Life of this patent
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Abstract
An actuator driving circuit includes a drive pulse signal generator, a drive voltage generator for generating a drive voltage for drive pulse signal generation upon receipt of a power supplied from a power source. The drive pulse signal is generated so that the relationship between the frequency of power noise cyclically produced from the drive voltage generator and imposed on the drive voltage and the frequency of the drive pulse signal satisfies the following equation: 4000<|m·f1−n·f2| wherein m: positive integer below a specified value; n: positive integer below a specified value; f1:frequency of power noise; and f2:frequency of the drive pulse signal.
Claims15
An actuator driving circuit comprising:
- a drive pulse signal generator which generates a drive pulse signal having a specified ultrasonic frequency, and supplies it to drive an actuator;
- and
- a drive voltage generator which generates a drive voltage for drive pulse signal generation upon receipt of a power supplied from a power source, and supplies it to the drive pulse signal generator;
- the relationship between the frequency of power noise cyclically produced from the drive voltage generator and imposed on the drive voltage and the frequency of the drive pulse signal being so set as to satisfy the following equation:
- 4000<|m·f1−n·f2|
- wherein
- m:
- positive integer below a specified value;
- n:
- positive integer below a specified value;
- f1:frequency of power noise;
- and
- f2:frequency of the drive pulse signal.
An actuator driving circuit comprising:
- a drive pulse signal generator which generates a drive pulse signal having a specified ultrasonic frequency, and supplies it to a ultrasonic motor having an electromechanical transducing element expandable and contractible in accordance with the drive pulse signal;
- and
- a drive voltage generator which generates a drive voltage for drive pulse signal generation upon receipt of a power supplied from a power source, and supplies it to the drive pulse signal generator;
- the relationship between the frequency of power noise cyclically produced from the drive voltage generator and imposed on the drive voltage and the frequency of the drive pulse signal being so set as to satisfy the following equation:
- 4000<|m·f1−n·f2|
- wherein
- m:
- positive integer below a specified value;
- n:
- positive integer below a specified value;
- f1:frequency of power noise;
- and
- f2:frequency of the drive pulse signal.
An actuator driving device comprising:
- a driving circuit including:
- a drive pulse signal generator which generates a drive pulse signal having a specified ultrasonic frequency, and supplies it to an actuator having an electromechanical transducing element expandable and contractible in accordance with the drive pulse signal, the drive pulse signal having a first section where its voltage level rapidly changes and a second section where its voltage level slowly changes in a direction opposite from the direction of rapid change;
- and
- a drive voltage generator which generates a drive voltage for drive pulse signal generation upon receipt of a power supplied from a power source, and supplies it to the drive pulse signal generator;
- the relationship between the frequency of power noise cyclically produced from the drive voltage generator and imposed on the drive voltage and the frequency of the drive pulse signal being so set as to satisfy the following equation:
- 4000<|m·f1−n·f2|
- wherein
- m:
- positive integer below a specified value;
- n:
- positive integer below a specified value;
- f1:frequency of power noise;
- and
- f2:frequency of the drive pulse signal.
- a drive member secured to one end of the electromechanical transducing element in its expanding and contracting directions;
- and
- a friction member frictionally coupled with the driving member.
A method for driving an actuator, comprising the steps of:
- generating a drive voltage upon receipt of a power supplied from a power source;
- generating a drive pulse signal upon receipt of the generated drive voltage, the drive pulse signal being generated at a frequency (f2) satisfying the following equation:
- 4000<|m·f1−n·f2|
- wherein
- m:
- positive integer below a specified value;
- n:
- positive integer below a specified value;
- and
- f1:frequency of power noise cyclically produced in the drive voltage generation and imposed on the drive voltage
- supplying the generated drive pulse signal to an actuator.
Dependencies are inferred from the claim text.