Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2000-09-15
2004-07-20
Budd, Mark (Department: 2834)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C310S323030, C310S316010
Reexamination Certificate
active
06765334
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to electronic equipment using a supersonic motor and a supersonic motor for frictionally driving a moving body by a vibrating body having a piezoelectric element, and more particularly to a micro-mechanism for linearly moving a moving body by using a rotary type supersonic motor.
2. Description of the Prior Art
Recently, a field for which the linear movement is required has been expanded in various electronic equipment, optical equipment, medical equipment or the like. In general, in such a case, for instance, an electromagnetic type motor and a feed screw are used in combination, a voice coil motor or a movable coil motor is used, or an actuator using piezoelectric element is used.
However, in the case where the electromagnetic motor and the feed screw are used in combination, the mechanism becomes complicated and large in size and at the same time it is impossible to control a fine feed amount due to a backlash in the feed mechanism. Also, in the case where the voice motor or the movable coil motor is used, it is very difficult to perform the fine positioning operation, and also in some cases the rigidity is low and the position is displaced due to the outside vibration. In particular, in many cases, the voice coil motor or the movable coil motor is used in combination with a leaf spring or the like, and in those cases, the rigidity is further degraded. Then, the actuator using the electromagnetic force is affected by adverse effect of the electromagnetic noise. Also, at the same time, since the electromagnetic noise is generated, adverse affect is applied to a recording medium such as a magnetic disc and there is a possibility that adverse affect would be applied to wave used in communication.
In the case where the actuator using the piezoelectric element is used, although it is possible to perform a fine control, the shift is fine but a rough movement is impossible. If the enlargement mechanism is provided, the mechanism becomes complicated and large in size.
Then, in the case of the above-described motor or actuator, the electric power is consumed even if the mechanism is stopped at a particular position.
Therefore, an object of the present invention is to provide a downsized linear motion mechanism that may perform a fine movement and a rough movement by using a rotary type supersonic motor.
SUMMARY OF THE INVENTION
According to the present invention, it is possible to realize a linear or swing motion mechanism with a supersonic motor for linearly moving or swinging and moving a moving body by a rotary type supersonic motor and an output transmission means such as a cam or a pinion rotating in cooperation with a rotor of the supersonic motor.
According to the present invention, a linear motion mechanism with a supersonic motor or a swing motion mechanism with a supersonic motor can be realized by comprising a supersonic motor for driving a rotor by vibration of a vibrating body having a piezoelectric element, a pinion cooperating with the movement of the rotor, a moving body having a rack operating in a constant direction in response to a rotation of the pinion, and a pressurizing mechanism provided in the moving body for imparting a contact pressure to the pinion and the rack of the moving body.
Next, the linear motion mechanism with a supersonic motor according to the present invention is characterized by the cam or the pinion and the rotor being provided integrally with each other. Thus, a greater drive force is obtained from the supersonic motor, and it is possible to realize the linear motion mechanism with the supersonic motor in small size and thin shape.
Further, in the above linear motion mechanism with a supersonic motor according to the present invention, an outer diameter of the cam or the pinion is smaller than an outer diameter of an output pickup portion of the vibrating body. Thus, the moving body may obtain a larger drive force.
According to the present invention, a swing motion mechanism with a supersonic motor can be realized by comprising a supersonic motor for driving a rotor by vibration of a vibrating body having a piezoelectric element, a cam cooperating with the movement of the rotor, a moving body operating in a swing motion in response to a rotation of the cam, and a pressurizing mechanism provided in a part of the moving body for imparting a contact pressure to the cam and the moving body.
A linear motion mechanism with a supersonic motor according to the present invention is characterized by comprising a supersonic motor for driving a rotor by vibration of a vibrating body having a piezoelectric element, a cam or a pinion cooperating with the movement of the rotor, a moving body operating in a constant direction in response to a rotation of the cam or the pinion, and a pressurizing mechanism provided on an extension line of a guide portion that guides the movement of the moving body, for imparting a contact pressure to the cam or the pinion and to the moving body. Thus, since the guide of the moving member and the pressurization on the moving member occur coaxially, the movement of the moving member does not slant but is smooth, thereby making the invention strong against the external turbulence such as vibration.
A linear motion mechanism with a supersonic motor according to the present invention is characterized by comprising a supersonic motor for driving a rotor by vibration of a vibrating body having a piezoelectric element, a cam cooperating with the movement of the rotor, a moving body operating in a constant direction in response to a rotation of the cam, a point of application of force by the cam on a straight line connecting two guide portions guiding the movement of the moving body or two support portions supporting the moving body, and a point of application of force by a pressurizing mechanism for imparting a contact pressure to the cam and the moving body, the point being present on the above straight line. Thus, the point of application of force by the cam and a point of application of force by the pressurizing mechanism are provided on the same straight line, and therefore the movement of the moving member does not slant but is smooth, thereby making the invention strong against the external turbulence such as vibration.
A linear motion mechanism with a supersonic motor according to the present invention is comprised by a supersonic motor for driving a rotor by vibration of a vibrating body having a piezoelectric element, a cam cooperating with the movement of the rotor, a moving body operating in a constant direction in response to a rotation of the cam, and a point of application of force by the cam in the gravitational center of the moving body. Thus, since the point of application of force by the cam acts concentrically on the gravitational center of the moving body, the movement of the moving member does not slant but is smooth, thereby making the invention strong against the external turbulence such as vibration.
The linear motion mechanism with a supersonic motor according to the present invention is characterized in that a guide member for guiding the movement of the moving body is provided in a part of a rotor pressurizing member for imparting a contact pressure to the rotor and the moving body. Thus, it is possible to realize the linear motion mechanism in small size and thin shape
The linear motion mechanism with a supersonic motor or the swing motion mechanism with a supersonic motor according to the present invention is characterized in that when the supersonic motor is to be started, the rotor is rotated in advance in a direction so that the pressurizing force of the pressurizing mechanism gives a rotational force to the rotor, or a stationary wave is generated by the vibrating body so that a predetermined operation is performed by the rotor after the rotor has previously been rotated by the pressurizing force of the pressurizing mechanism. Thus, the linear motion mechanism with a supersonic motor, or the swing motion mechanism w
Iino Akihiro
Kasuga Masao
Suzuki Makoto
Adams & Wilks
Budd Mark
Seiko Instruments Inc.
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