JPH0217870A - Ultrasonic driving gear - Google Patents

Abstract

PURPOSE:Reversely to drive a driven body linearly by bisecting the electrodes cramped by two piezoelectric transducers and by applying AC voltage across one of the bisected electrodes and an electrode outside the transducer. CONSTITUTION:In an ultrasonic driving gear screw holes 1a and 2a are respectively formed in the center of a lengthy metal block 1 and a shorter metal block 2, to which a bolt 3 is screwed. Between these two blocks two piezoelectric transducers 4 and 5 are cramped. Further, between both transducers 4 and 5 electrodes 6a and 6b divided into two at the center line are cramped. An electrode 7 is cramped between the transducer 5 and the shorter metal block 2. A stator 8 is thus constituted. Each terminal 9a and 9b of electrodes 6a and 6b is connected respectively to contacts 10a and 10b of a switch 10. AC voltage 12 is connected across a movable terminal 10c and a terminal 11 of the electrode 7. With the synthesization of generating flexural oscillation elliptic oscillation will thereby be generated to the stator 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ultrasonic drive device that generates reversible linear elliptical vibration on the end face of a bolted Langevin type vibrator.

[Prior Art] The present inventor discovered that when an AC voltage is applied to a piezoelectric vibrator of an asymmetric bolted Langevin type vibrator, the long and short sides of the piezoelectric vibrator are It was discovered that the threads of the bolts that fasten metal blocks generate traveling waves that rotate in the direction of the threads on the ends or sides of the long and short metal blocks. Then, an asymmetric bolted Langevin type vibrator is used to rotate the driven body by pressing the driven body against the end or side surface of the metal block where the traveling wave is generated or by pressing the driven body through a wear-resistant member. He proposed an ultrasonic drive device (see Japanese Patent Application No. 48517/1983).

[Problems to be Solved by the Invention] However, in the asymmetric bolted Langevin type vibrator configured in this way, traveling waves that rotate at the side or end faces are generated, but they travel in a straight radial direction and are A reversing traveling wave could not be generated.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a set of split electrodes and one electrode that are divided into two approximately along the center line by a long metal block and a short metal block. and two piezoelectric vibrators are sandwiched and fixed by bolts having male threads at both ends inserted into threaded holes provided in the axial direction approximately in the centers of each of the long metal block and the short metal block to form a stator. By applying an alternating current voltage between one of the divided electrodes and the electrode, the fundamental resonance of the longitudinal vibration and the resonance of the bending vibration of the stator are combined by the vibration in the thickness direction of the piezoelectric vibrator, A reversible linear elliptical vibration is generated on the end face of the stator, and a driven body is combined with the end face of the stator.

Further, a plurality of stators may be combined with the driven body.

[Function] In the ultrasonic driving device of the present invention, an electrode held between two piezoelectric vibrators is divided into two, and an alternating current is applied between the '6 pole on one side of the two halves and the outer electrode of the piezoelectric vibrator. By applying a voltage, one side of the piezoelectric vibrator vibrates in the thickness direction to produce bending motion, and this bending vibration and longitudinal vibration generate elliptical vibration in the linear direction at the end face of the stator. By driving the other electrode of the set, an elliptical vibration that progresses in the opposite direction is generated on the end face of the stator, so by combining the driven body with the end face of the stator, the driven body can be linearly reversible. Can be driven.

[Example] Referring to FIG. 1, in the ultrasonic driving device of the present invention, a long metal block 1 and a short metal block 2 have screw holes 1a and 2a formed in their centers, respectively, and these screw holes 1a,
Screws 3a and 3b at both ends of the bolt 3 are screwed into 2a, and two piezoelectric vibrators 4.5 are sandwiched between the short metal block 1 and the short metal block 2, and the piezoelectric vibrator 4 , 5 are sandwiched between electrodes 6a and 6b which are divided into two along the center line, and an electrode 7 is sandwiched between the piezoelectric vibrator 5 and the short metal block 2, thereby forming a stator 8. There is. Then, the terminal 9 of the electrode 6a
The terminals 9b of the electrode 6b and the terminal 9b of the electrode 6b are connected to the contacts 10a and 1Ob of the switch IO, respectively, and the movable terminal 1 of the switch 0
An AC power source 12 is connected between 0c and the terminal 11 of the electrode 7.

The stator 8 of this embodiment configured in this way connects the movable contact 10c of the switch 10 to the contact 10a, and connects the movable contact 10c of the switch 10 to the contact 10a, and
and the piezoelectric vibrator 4,
When an alternating current voltage is applied to the stator 5, a vibration occurs on the end face of the stator 8 as shown in the dotted line in FIG. As shown in , an elliptical vibration that moves in a straight line is generated. Further, the switch IO is switched to bring the movable contact 10c into contact with the contact Job, and the piezoelectric vibrator 4.
When an alternating current voltage is applied to 5, an elliptical vibration that moves in the opposite linear direction is generated.

FIG. 3 is a block diagram of an ultrasonic driving device according to an embodiment of the present invention, in which a rotating body 16 provided on a rotating shaft 15 rotatably supported by bearings 13, 14 is attached to an end surface of a stator 8 by a spring 17. When pressed by the stator 18, the rotating body 16 rotates in one direction due to the elliptical vibration of the end face of the stator 8. Further, by switching the movable contact 10c of the switch 10 shown in FIG. 1, the rotating body 16 is rotated in the opposite direction.

FIG. 4 is a perspective view of an ultrasonic drive device according to another embodiment of the present invention. When the end faces of two stators 8 are pressed under a flat plate-shaped driven body 19 supported by rollers, etc., the Drive body 19
moves in the direction of the arrow.

FIG. 5 is a plan view of an ultrasonic drive device according to still another embodiment of the present invention, in which a disk 20 is rotatably supported as a driven body, and a disk 20 is attached to one surface of the disk 20 as indicated by an arrow. Six stators 8, which generate elliptical vibration in the direction of rotation of the disc 20, are brought into contact with each other.

Even in this embodiment configured in this manner, the disk 20 is rotated by the elliptical vibration of each of the six stators 8.

In addition, the present invention is not limited to the above-mentioned embodiment, and three or four stators 8 are directly fixed to a driven body so that the driving force generated by the elliptical vibration of the stators 8 is in the same direction, and these stators are placed on a flat floor surface. One side of the stator 8 of each stator 8 is brought into contact with the
When an AC voltage is applied to the piezoelectric vibrator, the driven body can be linearly driven on the floor surface by the elliptical vibration of the stator 9. Further, by switching the switch 10, reverse driving can be performed.

Further, by attaching a wheel to the driven body and pressing the stator 8 against the wheel or its shaft using a spring or the like, the axle can be rotated to move the driven body forward or backward.

[Effects of the Invention] Since the present invention is configured as described above, when an AC voltage is applied to one side of the divided electrode to drive one side of the piezoelectric vibrator, longitudinal vibration of the stator in the length direction and The combination of bending vibrations caused by driving one side of the piezoelectric vibrator generates elliptical vibrations that move in one direction in the metal block, so by combining a driven body with the end face of the stator, the elliptical shape of one or more stators can be reduced. The driven body can be rotated or moved linearly by vibration, a stator can be attached to the driven body and it can run on the floor, or a stator can be mounted on wheels attached to the driven body or its shaft. The driven body can be made to travel by pressing the end face of the drive body, and the driven body can also be made reversible, so it has the advantage of having a very wide range of applications.

[Brief explanation of the drawing]

FIG. 1 shows an ultrasonic driver 1 of one embodiment of the present invention! FIG. 2 is a side view of the stator of the IJ device. FIG. 2 is a diagram showing the vibration state of the stator in FIG. 1. FIG. Side view of the sonic drive device, (b
) is a front view of an ultrasonic drive device, FIG. 4 is a perspective view of an ultrasonic drive device according to another embodiment of the present invention, and FIG. 5 is a plan view of an ultrasonic drive device according to yet another embodiment. . l... Long metal block, 2... Short metal block, 3... Bolt, 4.5... Piezoelectric vibrator, 6a,
6b, 7... Electrode, 8... Stator, 9a, 9
b...terminal, 10...switch, 10a, 10b
...Contact, 10c...Movable contact, 11...Terminal,
12... AC power supply, 13.14... Bearing, 1
5... Rotating shaft, 16... Rotating body, 17.18...
・Spring. Figure 1

Claims (1)

[Claims] 1. A set of divided electrodes and one electrode that are divided into two approximately along the center line by a long metal block and a short metal block, and 2.
A stator is constructed by sandwiching two piezoelectric vibrators and fixing them by tightening them into threaded holes provided in the axial direction approximately in the center of each of the long metal block and the short metal block using bolts having male threads at both ends, By applying an alternating current voltage between one of the divided electrodes and the electrode, the fundamental resonance of the longitudinal vibration and the resonance of the bending vibration of the stator are combined by the vibration of the piezoelectric vibrator in the thickness direction, and the stator 1. An ultrasonic driving device characterized by generating a reversible linear elliptical vibration on the end face of a stator, and combining a driven body with the end face of the stator. 2. The ultrasonic driving device according to claim 1, wherein a plurality of said stators are combined with said driven body.