JPS62178179A - Vibration-wave motor - Google Patents

Abstract

PURPOSE:To prevent partial friction, and to improve efficiency by dividing a slider into certain sections and separately making each section follow up to the sliding surface of a diaphragm. CONSTITUTION:A hemispherical contact member 7 is divided into some sections, and a plurality of the contact members 7 are mounted separately to a support plate 9 through an elastic body 8. The support plate 9 is fitted to a moving body through leaf springs 4. Even when the slider is given pushing force F by the leaf springs 4, each contact member 7 independently follows up to the warpage of a diaphragm 1, thus uniformly keeping surface pressure at all times.

Description

[Detailed Description of the Invention] A1 Objective of the Invention [Field of Industrial Application] The present invention relates to a vibration wave motor, in particular, to a vibration wave motor, which includes two sets of electrostrictive elements fixed to the surface of a diaphragm, and a motor which is suppressed by the diaphragm. It has a slider and a power supply that applies an alternating voltage to the electrostrictive element to generate a progressive vibration wave on the diaphragm, and the slider is driven by the frictional force between the diaphragm and the slider caused by the progressive vibration wave. This invention relates to a vibration wave motor that linearly drives a moving body to which it is attached.

[Conventional technology]

FIG. 5 is a perspective view showing the outline of a linear vibration wave motor. In FIG. 1, 1 is a diaphragm made of an elastic body forming an oval closed loop, and 2 is an electrostrictive element fixed to the surface of the diaphragm 1. It is. The electrostrictive elements 2 are arranged on both the front and back surfaces of one linear portion of the diaphragm 1, each having a depth of A, and the respective phases are joined alternately at regular intervals.

A slider 3 is pressed against the diaphragm l by a leaf spring 4. Reference numeral 6 denotes a movable body, which is connected to the leaf spring 4 and supported by a guide shaft 5 so as to be movable in the direction of the surface of the diaphragm l. As shown in FIG. 2, the jade slider 3 is elongated in the moving direction of the movable body, and has a convex cross section so that the contact part III with the diaphragm 1 is narrow, and the elongated surface of the convex part makes contact with the diaphragm.

When an alternating voltage with a phase difference of 90° is applied to the A-phase and B-phase electrostrictive elements 2, 2..., a progressive vibration wave (
A bending traveling wave) is generated, and the movable body 6 moves along the guide shaft 5 due to the frictional force generated at the contact portion between the slider 3 and the diaphragm l.

[Problem that the invention seeks to solve]

However, in the above configuration, (1) the linear part of the diaphragm is elongated relative to its thickness, so it is difficult to improve the accuracy of the flatness of the sliding surface of the diaphragm, and it is difficult to bring it into surface contact with the slider 3; It is.

(2) Since a moment is applied around the rear end of the slider 3 in the moving direction as the center of rotation, there is a partial contact with the rear end.

There were problems such as:

In order to solve the above-mentioned problems, it is necessary to increase the area of the sliding surface of the diaphragm, or to create a structure in which the slider follows the sliding surface of the diaphragm and is always in contact with the vibrating surface with uniform surface pressure. There is.

However, the former is extremely difficult to process, and the surface may become warped or bent due to temperature changes during use.
Not valid.

In the present invention, the slider follows the undulations of the sliding surface of the diaphragm,
The object of the present invention is to obtain a vibration wave motor which eliminates the above-mentioned problems by always contacting a vibration plate with a constant surface pressure.

Summary: Structure of the Invention [Means for Solving Problems] The present invention includes two sets of electrostrictive elements fixed to the surface of a diaphragm, a slider pressed against the diaphragm, and a progressive vibration on the diaphragm. a power source that applies an alternating voltage that generates a wave to the electrostrictive element, and a vibration wave that linearly drives a moving body to which the slider is attached by the frictional force between the vibration plate and the slider caused by the progressive vibration wave. A vibration wave motor, characterized in that the slider is divided into a plurality of parts along the traveling direction of the moving body, and each divided part is configured to independently contact the diaphragm via an elastic body. It is.

[For production]

Since each slider moves independently in the vertical direction following the vibrating surface, it always contacts the vibrating surface with uniform surface pressure, preventing localized wear and noise from the slider. .

〔Example〕

Hereinafter, embodiments of the present invention will be explained with reference to the drawings.

FIG. 1 shows a slider applied to the vibration wave motor of the present invention, with FIG. 1(a) being a front view and FIG. 1(b) being a side view. In FIG. 1, 7 is a hemispherical contact member, and a plurality of contact members 7 are each independently connected to an elastic body 8.
The supporting plate 9 is attached to the moving body via a leaf spring.

FIGS. 2(a) and 2(b) show a slider applied to a conventional vibration wave motor (Fig. 2(a)) and a slider having the structure described in 1-1 applied to the vibration wave motor of the present invention (Fig. 2(b)). FIG. If the diaphragm l is warped as shown in the figure, the conventional slide'' (Fig. (a)) is given a pressing force F by the leaf spring 4 and contacts the diaphragm only at one point in the center. The wear state of the contact surface becomes uneven, and the generated frictional force is also unstable.

However, as shown in FIG. 2(b), the slider according to the present invention, in which the contact member 7 is divided into a plurality of parts and each has elasticity independently, does not allow the diaphragm l to warp even when the pressing force F is applied by the leaf spring 4. Each contact member 7 independently follows this, making it possible to always keep the surface pressure uniform.

Even when the diaphragm 1 is warped in the opposite direction to that shown in FIG. 2, the slider according to the present invention can follow the sliding surface of the diaphragm 1, and a stable frictional force can be obtained with the diaphragm 1.

FIG. 3 is a plan view showing another embodiment of the slider applied to the vibration wave motor of the present invention, and FIG. 4 is a front view thereof. A leaf spring 11 divided into many parts in the shape of a comb tooth is fixed to a support member 12, and a contact member 7 is attached to each divided tip of the leaf spring 11 via a vibration isolating member 10. The member 7 follows the undulations of the sliding surface of the diaphragm.

C. Effects of the Invention As described above, according to the present invention, the slider is divided into several parts, each of which independently follows the sliding surface of the diaphragm.

(1) The slider and the sliding surface of the diaphragm come into uniform contact to prevent local wear.

(2) Efficiency is improved because the slider can follow variations in the vibration amplitude of the diaphragm.

(3) Prevents slider noise due to variations in the vibration amplitude of the diaphragm.

Effects such as this can be obtained.

[Brief explanation of drawings]

Figure 1 shows the configuration of a slider applied to the vibration wave motor of the present invention, with Figure 1 (a) being a front view and Figure 1 (b) being a front view.
is a side view thereof, and FIGS. 2(a) and 2(b) are comparative diagrams of the contact state between the sliding surface of a slider applied to a conventional vibration wave motor and a slider applied to the vibration wave motor of the present invention, respectively. FIG. 3 is a plan view showing another embodiment of the slider applied to the vibration wave motor of the present invention, FIG. 4 is a front view thereof, FIG. 5 is a structural diagram of a conventional linear vibration wave motor, and FIG. 6 1 is a perspective view showing a slider applied to a conventional vibration wave motor. ■...Vibration plate, 2...Electrostrictive element f, 3...Sura f
Da. 4...Slider pressure spring, 5...Guide shaft, 6...
- Moving body, 7... Contact member, 8... Elastic body, 9...
・Support plate. DESCRIPTION OF SYMBOLS 10... Vibration isolation member, 11... Leaf spring, 12... Supporting member.

Claims (1)

[Claims] (1) Two sets of electrostrictive elements fixed to the surface of a diaphragm, a slider pressed against the diaphragm, and a power source that applies an alternating voltage to the electrostrictive element to generate a progressive vibration wave on the diaphragm. A vibration wave motor that linearly drives a moving body to which the slider is attached by a frictional force between the diaphragm and the slider caused by the progressive vibration waves, wherein the slider is moved along the traveling direction of the moving body. 1. A vibration wave motor characterized in that it is divided into a plurality of parts, and each divided part is configured to be brought into contact with the diaphragm independently via an elastic body.