JPH03150079A - Oscillatory wave motor - Google Patents

Abstract

PURPOSE:To eliminate unevenness of a speed and generation of a sound by providing a rail-shaped stator with bending work applied to a bottom plate of a motor case. CONSTITUTION:An oscillatory wave motor is constituted of an elastic unit 1, piezoelectric element 2, pressure spring 3, vibratory insulating material 5, felt 7, etc. A rail-shaped protruding part 11a of squared section with one side open is formed by applying bending work to a bottom plate 11 of a motor case, and this part 11a serves as a railshaped stator on which the elastic unit 1 is moved. By providing this rail-shaped protruding part 11a, rigidity is increased of the bottom plate 11, even when it is in small thickness, a warp of a surface can be decreased to enable the elastic unit 1 to smoothly move.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a vibration wave motor that moves an elastic body in which a traveling wave is formed along a rail-shaped stator.

[Prior Art] Conventional vibration wave motors of this type include those shown in FIGS. 4 and 5.

Reference numeral 1 denotes an elastic body made of a metal material having projections 1a provided on the sliding surface side, and a progressive vibration wave is formed by applying an alternating current voltage to a piezoelectric element 2 bonded to the upper surface of the elastic body.

Note that the generation principle of the progressive vibration wave and the structure of the piezoelectric element 2 are well known and will not be described in detail. It is formed by applying an alternating current voltage having a Reference numeral 8 denotes a rail-shaped stator that comes into frictional contact with the elastic body l, and is fixed to the bottom plate 10 of the motor case, and is brought into contact with the elastic body l by a pressure spring 3 via a vibration insulating material 5 (for example, felt). There is.

Reference numeral 6 denotes a comb tooth-shaped slat stopper, the comb tooth portion 6a of which is inserted into a slit (not shown) of the elastic body 1 in a portion not in contact with the rail-shaped stator 8; The elastic body 1 is supported via a felt pad placed at the bottom of the holder.

The elastic body 1 is a detent 6. Placement table 4 via pressure spring 3 etc.
The mounting table 4 is supported by Bv, which is the planned movement direction.
It is supported by a restraining member 9 that restrains displacement in other directions.

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, and the mounting table moves accordingly. 4 and other members (3, 5, 6, 7) are also BY along the restraining member 9.
BwJ in the direction. At this time, the generated frictional driving force acts on a part of the elastic body 1, which is displaced from the support portion, so that a moment acts on the elastic body 1, causing it to shift in the 8x and BY directions.

As shown in FIG. 5, the comb teeth 6a of the detent 6 are inserted into the slits of the elastic body 1, and restrain the displacement of the elastic body 1 in the BY direction, and also transfer the own weight of the elastic body 1 to the felt flap. Supported through. The restraint members 6b and 6c restrain the displacement of the elastic body 1 in the Bx direction, and the restraint member 6d restrains the displacement of the elastic body 1 on the pressure section side in the BY direction. These members 6a 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, when the thickness of the rail-shaped stator 8 and the bottom plate 10 is reduced in order to save space, it becomes difficult to improve the flatness. The pressing force between the stator 8 and the stator 8 is uniform in the longitudinal direction (
However, unevenness may occur depending on the location. Therefore, there was a drawback that speed unevenness of linear motion occurred.

Also. A gap is likely to be formed between the rail-shaped stator 8 and the bottom plate 10, and noise may be generated by the two hitting each other during driving.

An object of the present invention is to provide a vibration wave motor that is rigid and has good planar accuracy even if the plate material constituting the rail-shaped stator is thin, and that does not generate speed unevenness or sound.

[Means for Solving the Problems] The gist of the present invention is to provide an elastic body on a rail-shaped stator so that it can be moved along its longitudinal direction, and to The rail-shaped stator is brought into pressure contact with the rail-shaped stator, and a progressive vibration wave is formed by applying an alternating current voltage to the electro-mechanical energy conversion element joined to the elastic body, and the elastic body is pressed into contact with the rail-shaped stator. The vibration wave motor is characterized in that the rail-shaped stator is formed by bending a part of another member made of plate material into a convex shape. This is a vibration wave motor.

[Function] The vibration waves of the above-mentioned configuration are generated by bending a part of other plate members to form the rail-shaped stator integrally, so the motor has high rigidity and high precision flatness. can be obtained.

[Embodiments] Embodiment 1 FIG. 1 is a side view showing Embodiment 1 of a vibration wave motor according to the present invention, and the same parts as in FIG. 4 are given the same reference numerals.

In this embodiment, the bottom plate 11 is bent to form a rail-shaped protrusion 11a having a U-shaped cross section, and this is used as a rail-shaped stator. 81
I try to do 11. This reduces the number of parts, eliminates the need to consider the adhesion between the bottom plate and the rail-shaped stator, and increases the rigidity of the bottom plate 11 by providing the rail-shaped protrusions 11a, preventing surface warping even if the bottom plate is thin. It can be made small and the elastic body 1 can be moved smoothly.

Example 2 FIG. 2 shows Example 2, in which resin flb is bonded to the upper surface of the rail-shaped convex portion 11a shown in FIG. 1 to improve wear resistance.

Embodiment 3 FIG. 3 shows Embodiment 3, in which the rail-shaped convex portion 11
A is formed into a semicircle.

In this embodiment, no matter how the elastic body 1 is inclined, the rough corners of the elastic body 1 do not come into contact with the rail-shaped convex portions 11a, so that the elastic body 1 can move smoothly.

[Effects of the Invention] As explained above, according to the present invention, the rail-shaped stator is provided by bending the bottom plate of the motor case, so even a thin bottom plate can have increased rigidity and improved flatness. This allows the elastic body to move smoothly. Further, since the bottom plate and the rail-shaped stator are integrated, for example, there is no gap between the two and they do not hit each other during driving, thereby preventing the generation of noise.

[Brief explanation of the drawing]

FIG. 1 is a side view showing Embodiment 1 of the vibration wave motor according to the present invention, FIGS. 2 and 3 are side views showing Embodiment 2.3, respectively, and FIGS. FIG. 2 is a side view and a plan view showing the configuration of a wave motor. 1-...Elastic body 2...Piezoelectric element 8, ll
a-Rail-shaped stator to, tt-...bottom plate and 4 others Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 8 b Port

Claims (1)

[Claims] 1. An elastic body is provided on the rail-shaped stator so as to be movable along its longitudinal direction, and the elastic body is brought into pressure contact with the rail-shaped stator by a pressure means, so that the elastic body In a vibration wave motor that forms a progressive vibration wave by applying an alternating current voltage to the joined electro-mechanical energy conversion elements and moves the elastic body while making frictional contact with the rail-shaped stator, the rail-shaped stator is A vibration wave motor characterized in that it is formed by bending a part of another member made of a plate material into a convex shape. 2. The vibration wave motor according to claim 1, wherein the rail-shaped stator has a U-shaped cross section. 3. The vibration wave motor according to claim 1, wherein the rail-shaped stator has a hemispherical cross section. 4. The vibration wave motor according to claim 1, 2 or 3, wherein the rail-shaped stator is formed in a part of the bottom plate of the motor case.