JPH0393481A - Vibration wave motor - Google Patents

Abstract

PURPOSE:To permit the stabilized movement of an elastic body by a method wherein resin is jointed so that the contacting surface of a rail type stator is covered with the resin from the contacting surface to the upper part of a side surface orthogonal to the contacting surface and the contacting part between the stator and the elastic body is made smooth. CONSTITUTION:A coating layer 8a is formed by jointing resin so that the surface of a rail type stator 8, which is opposed to the bottom sheet 10 of the stator 8, and the upper part of one side surface of the stator 8 are covered by the resin. Accordingly, the surface of the rail type stator 8, which is contacted with the elastic body 1, can be smoothed when the elastic body 1 is contacting with the stator 8 with such inclination as the left side of the elastic body 1 in the figure becomes lower than the right side of the same or becomes the same level as the right side. According to this method, the elastic body 1 may be moved stably even when the same is not face contacting with the rail type stator 8 strictly.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a vibration wave motor, in particular, a vibration wave motor in which an elastic body in which a traveling wave is formed is pressed against a rail-shaped stator, and the elastic body is moved along the rail-shaped stator. This relates to a vibration wave motor that uses a vibration wave motor. [Prior Art] Conventional vibration wave motors of this type include, for example, those shown in FIG.
A configuration as shown in FIG. 7 has been proposed.

1 is an elliptical elastic body having a protrusion 1a provided on the sliding surface side, and a piezoelectric element 2 for forming a progressive vibration wave on the elastic body 1 is bonded to the upper surface of the elastic body 1. A rail-shaped stator 8 is in frictional contact with the elastic body 1, and is pressed against the elastic body 1 by a pressure spring 3 via a vibration insulating material 5 (for example, felt). Reference numeral 6 denotes a comb-shaped detent, the comb tooth portion 6a of which is inserted into a slit of the elastic body 1 in a portion not in contact with the rail-shaped stator 8, and the comb tooth portion 6a is placed at the bottom of the slit. The elastic body 1 is supported via felt 7.

The elastic body 1 is supported by a mounting table 4 via a detent 6, a pressure spring 3, etc., and the mounting table 4 is moved in the planned direction of movement B.
It is supported by a restraining member 9 that restrains displacement in directions other than the Y direction.

When a progressive vibration wave is formed in the elastic body 1, the elastic body 1 moves on the rail-shaped stator 8 due to the frictional force between the rail-shaped stator 8 and the elastic body 1. The stand 4 and other members (3, 5, 6.7) are also BY along the restraining member 9.
move in the direction. At this time, the generated frictional driving force acts on a part of the elastic body 1, and since it is displaced from the support part, a moment acts on the elastic body 1, causing it to shift in the BX and BY directions. The comb tooth portion 6a of the detent 6 is connected to the elastic body 1 as shown in FIG.
is inserted into the slit of the elastic body 1, and restrains the displacement of the elastic body 1 in the BY direction, and also supports the own weight of the elastic body 1 via the felt 7. The restraint parts 8b and 8c are BX of the elastic body 1.
The restraining member 6d restrains the displacement of the elastic body 1 on the pressure section side in the BY direction. These restraining members 68 to 6d allow the elastic body 1 to smoothly move linearly together with the mounting table 4 without wobbling. [Problems to be Solved by the Invention] However, in the conventional example described above, it is extremely difficult to bring the elastic body 1 and the rail-shaped fixing member 8 into exact surface-to-surface contact, and in reality, FIGS. The elastic body 1 makes contact with a slight tilt as shown in the figure. Therefore, in the case of Figure 8,
A corner of the elastic body 1 is in line contact with the rail-shaped stator 8, and in FIG. 9, a corner of the rail-shaped stator 8 is in line contact with the elastic body 1. However, there was a problem in that it was difficult to clean the corners of both the elastic body 1 and the rail-shaped stator 8, and it was difficult to move the elastic body 1 stably. An object of the present invention is to provide a vibration wave motor that can stably move an elastic body without strictly surface contact between the elastic body and a rail-shaped stator.

[Means and effects for solving the problem] The gist of achieving the object of the present invention is to solve the following problems from the contact surface of the rail-shaped stator:
By bonding the resin so as to cover the upper part of the side surface perpendicular to that surface, or by chamfering or spherical corners, the contact area with the elastic body can be made smooth, and the elastic body and rail shape can be made smooth. This allows the elastic body to move stably without making strict surface contact with the stator. [Embodiment] The present invention will be explained in detail below based on the illustrated embodiment, but FIGS. 1 to 5 only differ from the conventional structure shown in FIGS. 6 and 7. It shows. FIG. 1 shows a first embodiment of the present invention. In this example,
A coating layer 8a is formed by bonding resin to cover the rail-shaped stator 8 from the surface opposite to the bottom plate 10 to the top of one side surface. Therefore, if the elastic body 1 is in contact with the rail-shaped stator 8 at an angle such that the right side is lower than the left side in the figure, or the same slope, the contact portion of the rail-shaped stator 8 with the elastic body 1 The surface can be made smooth.

FIG. 2 shows a second embodiment of the invention.

Corner 8a of the sliding part of the rail-shaped stator 8 in this embodiment
By making it a spherical surface, the contact portion with the elastic body 1 can be made smooth.

FIG. 3 shows a third embodiment, in which a rail-shaped stator 8 with a semicircular cross-sectional shape is used, so that the contact portion with the elastic body 1 can be made smooth. FIG. 4 shows a fourth embodiment, in which a round bar rail-shaped stator 8 is installed on a bottom plate 10 with a V-groove 10a, and the same applies to the third embodiment. However, even if the elastic body 1 is tilted so that the right side is higher than the left side in the figure (not shown), the corner of the elastic body 1 does not come into contact with the rail-shaped stator 8, so it can be driven smoothly. ．． Figure 5 shows
A fifth embodiment is shown, in which corner portions 8a of the sliding portions of the rail-shaped stator 8 are chamfered so that the contact portions with the elastic body 1 can be made smooth.

In addition, in FIGS. 2 to 5, the rail-shaped stator 8 is shown as being made of an elastic member or resin, but if the rail-shaped stator is formed of an elastic member, for example, the smooth elastic body 1 and the Needless to say, it is also possible to form a coating layer by bonding a resin to the contact area. [Effects of the Invention] As explained above, according to the present invention, by smoothing the contact surface of the rail-shaped stator with the elastic body and chamfering the corners of the contact part, the contact between the rail-shaped stator and the elastic body can be easily achieved. The surface roughness of the contact area can be reduced, and the elastic body can be moved stably without having to make strict surface contact between the elastic body and the rail-shaped stator.

[Brief explanation of drawings]

1 to 5 are schematic diagrams of main parts of vibration wave motors showing first to fifth embodiments of the present invention, respectively, and FIGS. 6 and 7 are side views of the configuration of a conventional vibration wave motor, respectively. The figure, plan view, and FIGS. 8 and 9 are partial schematic diagrams of a conventional vibration wave motor.

Claims (1)

[Claims] 1. By applying an alternating electric field to an electro-mechanical energy conversion element joined to an elastic body, a progressive vibration wave is formed in the elastic body, and the elastic body is aligned with a rail-shaped stator. A vibration wave motor that moves the rail-shaped stator along the rail-shaped stator by the progressive vibration waves in frictional contact with each other, characterized in that the contact surface of the rail-shaped stator with the elastic body is smoothed. motor. 2. Claim 1, wherein the rail-shaped stator is formed to have a rectangular cross section, and a coating layer made of resin is formed from the surface facing the elastic body to a part of at least one side surface thereof.
The vibration wave motor described in . 3. The vibration wave motor according to claim 1, wherein the rail-shaped stator has a rectangular cross section with a corner of the sliding portion having a spherical shape. 4. A vibration wave motor characterized in that the rail-shaped stator of claim 3 is replaced with a semicircular rail-shaped stator. 5. A vibration wave motor characterized in that the rail-shaped stator of claim 3 is replaced with a round bar. 6. A vibration wave motor characterized in that, instead of the rail-shaped stator according to claim 3, the rail-shaped stator is formed to have a rectangular cross section with chamfered corners of the sliding portion.