Vibration actuator apparatus
First Claim
1. An apparatus including a vibration actuator for moving an object relative thereto, wherein an electrical signal is applied to an electro-mechanical energy conversion element of the actuator to form a vibration in the actuator, and to obtain a drive force therein based on the vibration, the apparatus comprising:
- a detecting circuit that detects a moving state of the object in accordance with a driving force of said actuator and generates an output representing said moving state;
a monitoring circuit that monitors a vibration state of said actuator and outputs a monitor signal having a frequency corresponding to the vibration state; and
sampling means for sampling the output of said detecting circuit at a timing determined by the frequency of said monitor signal.
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Abstract
An actuator apparatus for applying an electrical signal to an electro-mechanical energy conversion element to form a vibration, and for driving a moving body based on the vibration.
When the moving speed of a moving body moved by the actuator apparatus is monitored by, e.g., an encoder, the apparatus detects the encoder output at a timing corresponding to the vibrating state of the actuator, so that an encoder output free from the influence of the vibration can be precisely detected.
50 Citations
19 Claims
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1. An apparatus including a vibration actuator for moving an object relative thereto, wherein an electrical signal is applied to an electro-mechanical energy conversion element of the actuator to form a vibration in the actuator, and to obtain a drive force therein based on the vibration, the apparatus comprising:
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a detecting circuit that detects a moving state of the object in accordance with a driving force of said actuator and generates an output representing said moving state; a monitoring circuit that monitors a vibration state of said actuator and outputs a monitor signal having a frequency corresponding to the vibration state; and sampling means for sampling the output of said detecting circuit at a timing determined by the frequency of said monitor signal. - View Dependent Claims (2, 3, 4, 13)
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5. An apparatus including a vibration actuator for moving an object relative thereto, wherein an electrical signal is applied to an electro-mechanical energy conversion element to form a vibration in the actuator, and to obtain a drive force therein based on the vibration, the apparatus comprising:
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a detecting circuit that detects a moving state of the object in accordance with a driving force of said actuator and generates an output representing said moving state; a monitoring circuit that detects a vibration state of said actuator and generates a monitor signal having a frequency corresponding to the vibration state; sampling means for sampling the output from said detecting circuit at a timing determined by the frequency of said monitor signal; and a speed processing circuit that determines a moving speed of the object based on the output sampled by said sampling means and adjusts a state of the electrical signal applied to said electro-mechanical energy conversion element in accordance with the determined moving speed. - View Dependent Claims (6)
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7. A control apparatus including a vibration actuator for moving an object relative thereto, wherein an electrical signal is applied to an electro-mechanical energy conversion element to form a vibration in the actuator, and to obtain a drive force therein based on the vibration, the apparatus comprising:
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means for detecting a moving state of the object in accordance with a driving force of said actuator and for generating an output value representing said moving state; sampling means for sampling the output value from said moving state detecting means at a timing determined by a frequency of the vibration in said actuator; and evaluating means for evaluating said moving state on the basis of a plurality of output values sampled by said sampling means. - View Dependent Claims (8)
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9. An apparatus including a vibration actuator for moving an object relative thereto, wherein an electrical signal having a predetermined frequency is applied to an electro-mechanical energy conversion element to form a vibration in the actuator, and to obtain a drive force therein based on the vibration, the apparatus comprising:
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a detecting circuit that detects a moving state of the apparatus in accordance with a driving force of said actuator and generates an output representing said moving state; and sampling circuit means for sampling the output of said detecting circuit at a timing determined by a frequency of the electrical signal applied to said conversion element. - View Dependent Claims (10, 11, 12)
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14. An apparatus including a vibration actuator having a driving vibration for moving an object relative thereto, comprising:
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an encoder coupled with said vibration actuator; a vibration state detecting circuit which detects information corresponding to a frequency of the driving vibration of the vibration actuator; sampling means for sampling output information of said encoder at a timing determined by information corresponding to the frequency of the driving vibration of said vibration actuator detected by said vibration state detecting circuit; and a processing circuit that processes the sampled output information sampled by said sampling means. - View Dependent Claims (15)
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16. A control apparatus including a vibration actuator for moving an object relative thereto, wherein an electrical signal is applied to an electro-mechanical energy conversion element to form a vibration in the actuator, and to obtain a drive force therein based on the vibration, the apparatus comprising:
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means for detecting a moving state of the object in accordance with a driving force of said actuator and for generating an output value according to said moving state; sampling means for sampling an output value from said moving state detecting means at a timing determined by a frequency of the vibration of said actuator; and processing means for processing said moving state on the basis of an output value sampled by said sampling means.
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17. A control apparatus including a vibration actuator for moving an object relative thereto, wherein an electrical signal is applied to an electro-mechanical energy conversion element of the actuator to form a vibration in the actuator, and to obtain a drive force based on the vibration, said apparatus comprising:
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a detecting circuit that detects a moving state of the object in accordance with a driving force of said actuator; a monitoring circuit that monitors a vibration state of said actuator and outputs a monitor signal corresponding to the vibration state; and sampling means for sampling the output of said detecting circuit at a timing determined by the monitor signal.
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18. A control apparatus including a vibration actuator for moving an object relative thereto, wherein a periodic electrical signal is applied to an electro-mechanical energy conversion element to form a vibration in the actuator, and to obtain a drive force therein based on the vibration, the apparatus comprising:
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a detecting circuit that detects a moving state of the apparatus in accordance with a driving force of said actuator; and sampling means for sampling the output of said detecting circuit at a timing determined by the frequency of the periodic electrical signal applied to said conversion element.
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19. An apparatus including a vibration actuator having a driving vibration for moving an object relative thereto, comprising:
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a detection circuit that detects a moving state of the object; and sampling means for sampling output information of said detection circuit at a timing determined by the driving vibration of said vibration actuator.
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Specification