Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
1998-09-09
2001-04-17
Dougherty, Thomas M. (Department: 2834)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C310S314000
Reexamination Certificate
active
06218764
ABSTRACT:
This application is based on patent application No. 9-277945 filed in Japan, the contents of which is hereby incorporated by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an actuator using an electromechanical transducer and a drive pulse generating apparatus suitable for driving the actuator.
2. Prior Art
Various actuators have conventionally been used for driving a member constituting a precision apparatus of a camera, an XY stage or the like and as an actuator which is small-sized, light-weighted and capable of carrying out fine positioning, there has been proposed by the applicant an electromechanical transducer, for example, a linear progressing type actuator which is constituted to generate elongation and contraction displacement in a piezoelectric element, transmit the elongation and contraction displacement to a drive member and move a driven member via a moving member frictionally coupled to the drive member (U.S. Pat. No. 5,589,723).
Although drive pulses of sawtooth waves are used in a linear progressing type actuator or a rotary type actuator using an electromechanical transducer mentioned above, it has been found that the frequency of the drive pulse and the drive speed are not in a proportional relationship, when the frequency of the drive pulse exceeds a certain range, the drive speed is decreased and there is a limit in increasing the drive speed even when the frequency of the drive pulse is increased.
SUMMARY OF THE INVENTION
It is a principal object of the present invention to provide an actuator using an electromechanical transducer capable of driving at high speed and efficiently and a drive pulse generating apparatus outputting drive pulses capable of driving such an actuator at high speed and efficiently.
It is another object of the present invention to provide a drive pulse generating apparatus for determining a range of frequency and a range of wavelength of drive pulses in a sawtooth wave capable of driving an actuator using an electromechanical transducer at high speed and efficiently and outputting such drive pulses.
Other object of the present invention will become apparent from a detailed description of the present invention in reference to the attached drawings.
REFERENCES:
patent: 4622483 (1986-11-01), Staufenberg, Jr. et al.
patent: 4689514 (1987-08-01), Kondoh et al.
patent: 5589723 (1996-12-01), Yoshida et al.
patent: 5907212 (1999-05-01), Okada
patent: 5917267 (1999-06-01), Miyazawa et al.
patent: 5969464 (1999-06-01), Nakano et al.
Document H39, Development of Smooth Impact Mechanism (SIDM) (Third Phase), by Ryuichi Yoshida, et al, from the Proceedings of Japan Society of Precision Engineering (JSPE) issued on Sep. 10, 1997 (translation provided).
Document H40, Development of Smooth Impact Mechanism (SIDM) (Fourth Phase), by Ryuichi Yoshida, et al, from the Proceedings of Japan Society of Precision Engineering (JSPE) issued on Sep. 10, 1997 (translation provided).
Hamamatsu Akira
Higuchi Toshiro
Yoshida Ryuichi
Dougherty Thomas M.
Minolta Co. , Ltd.
Sidley & Austin
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