JP2701093B2 - Ultrasonic linear slide mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piezoelectric ceramic vibrator, and more particularly to a linear slide mechanism using a cylindrical piezoelectric ceramic vibrator.

[0002]

2. Description of the Related Art A conventional example will be described with reference to FIG. In this case, a standing wave type ultrasonic motor is shown, in which the tip of a vibrating piece 51 attached to a Langevin type vibrator 50 is brought into contact with the rotor 52 with a slightly inclined surface. Thereby,
When the vibrating piece 51 reciprocates in the length direction, the rotor 52 is rotated by a component force generated in the circumferential direction of the rotor 52.

FIG. 7 shows a piezoelectric element at one end of a moving body 60.
This is an example in which the fixing of the piezoelectric element 61 is carried out in a worm-like manner by utilizing a reaction accompanying the rapid deformation of the piezoelectric element 61. That is,
The inertial body 62 is attached to the moving body 60 via the piezoelectric element 61, and the moving body 60 is held on the guide surface 63 by a frictional force. The moving body 60 is placed on the guide surface 63 and held by frictional force. Then, by controlling the applied voltage pattern of the piezoelectric element 61 coupled to one end of the moving body 60, an appropriate acceleration is given to the inertial body 62, and a small distance of the moving body 60, for example, the order of μm is obtained by the reaction. Things.

[0004]

The above-mentioned conventional example has a problem that it is not a linear slide, and a problem that the contact point between the vibrating reed and the rotor is apt to occur, so that it has not been put to practical use. Further, the second conventional example has a problem that the moving distance is in the range of nm to μm, and the application is limited to only a small distance of movement.

[0005]

In order to achieve the above-mentioned object, the invention according to claim 1 of the present application is directed to a two-piece type having a cylindrical shape.
Piezoelectric ceramics coaxially connected with a spacer in between
And a cylindrical shape in the central opening of each of the piezoelectric ceramics.
Are disposed, and the inner peripheral surface of one of the elastic bodies
Consists of a plurality of protrusions inclined at a predetermined angle to the central axis
A first projection piece group is formed, and on the inner peripheral surface of the other elastic body,
A plurality of protrusions inclined in a direction opposite to the first protrusion piece group.
A second group of projections made of raised pieces is formed.
In the central opening of the elastic body, the first projection piece group and the second
A pipe-shaped moving body that comes into contact with the projections
Alternating voltage applied to one of the piezoelectric ceramics
To generate ultrasonic vibrations and reversibly move the moving body in the axial direction.
It is characterized by being able to slide. Also, billing
The invention described in Item 2 is the two piezoelectric ceramics having a cylindrical shape.
Are connected coaxially with a spacer
Insert a pipe-shaped moving body through the center opening of the mix,
Covering the periphery of the piezoelectric ceramic and the moving body
Each of the above-mentioned piezoelectric ceramics
And move to the contact part between one elastic body and the moving body
A first projection comprising a plurality of projections inclined with respect to the axial direction of the body;
And a contact portion between the other elastic body and the moving body.
Has a plurality of projections inclined in the direction opposite to the first projection piece group.
Forming a second projection group consisting of the projection pieces of
An alternating voltage is applied to one of the ceramics to produce a supersonic
Wave vibration is generated, and the moving body is reversibly slid in the axial direction.
It is characterized by being able to perform id. Claim 3
Akira is in the center opening of a cylindrical piezoelectric ceramic.
A cylindrical elastic body is provided at the center of the elastic body.
Insert a pipe-shaped moving body into the opening, and
To generate an ultrasonic vibration by applying an alternating voltage to the
Ultrasonic linear slide that slides the moving body in the axial direction
In the mechanism, an axial direction of the moving body is provided around the moving body.
Forming a plurality of projecting pieces inclined in a predetermined direction with respect to the
It is characterized by having.

[0006]

The present invention is a linear slide mechanism using an ultrasonic vibrator that generates vibration controlled by an applied voltage pattern when an electric field is applied to electrodes provided on the upper and lower surfaces of a cylindrical piezoelectric ceramic. . That is, when an electric field is applied to the electrodes, resonance is obtained by a transverse effect in the length direction and the width direction and a longitudinal effect in the thickness direction. However, in the present invention, the piezoelectric ceramic is vibrated in the radial direction to make the piezoelectric ceramic transparent. Similarly, the elastic body arranged in the hole is vibrated in the radial direction, and the protrusion is vibrated in the axial direction,
The moving body frictionally joined to the moving body is moved linearly (linear slide).

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described based on one embodiment shown in the drawings. FIG. 1 shows a linear slide mechanism 1 according to the present invention, in which an elastic body 4 is arranged in a through hole 2 of a cylindrical piezoelectric ceramic 3 having a plane circular shape and having a through hole 2 in the center. As an example, the cylindrical piezoelectric ceramic 3 is made of zircon-titanate obtained by adding a small amount of an appropriate additive to zircon oxide, titanium oxide, and lead oxide powder raw materials, molding with a press, and firing at about 1200 ° C. Lead ceramics (PZ
T ceramics) or the like, but is not limited thereto.

The elastic body 4 is made of metal, rubber such as natural rubber or synthetic rubber, hard plastic such as ABS resin, a laminate of carbon fiber or glass fiber, or a composite with metal, and has excellent wear resistance. Use the appropriate material.

The elastic body 4 is integrally fixed in the through hole 2 of the piezoelectric ceramic 3, and a projection 6 for sliding the moving body 5 described below is provided on the inner wall surface. Moving object 5
Is made of metal or the same material as the elastic body. The protrusion 6 has a direction by inclining a portion in contact with the moving body 5 slightly downward.

[0010] Further, the connecting electrodes for applying an electric field to the piezoelectric ceramic 3 and below the thickness direction, it it the upper electrode 7, forming the lower electrode 8, and connect it to the drive circuit (not shown) ing.

FIG. 3 shows an example in which the same components as those in the above-described embodiment are arranged vertically with a spacer interposed therebetween. When an electric field is applied to the piezoelectric ceramic electrode, the moving body can be moved in any direction of the inclination by the same action as described above.

FIG. 4 shows another embodiment of the present invention.
In this embodiment, as shown in FIG.
Mixes 10 and 11 are arranged in upper and lower tiers,
Elastic bodies 14 and 15 having a two-stage cylindrical structure are arranged. Soshi
Between the narrow diameter portions of the elastic bodies 14 and 15 and the moving body 16.
Are provided with projections 12 and 13, respectively. Soshi
Therefore, each of the projections 12 and 13 is positioned with respect to the longitudinal direction of the moving body 16.
Slant in the opposite direction.

FIG . 5 is a diagram showing the configuration of still another embodiment.
In this embodiment, a projection 22 is formed on the elastic body 22 side.
Instead of being formed, a serrated protrusion 2
By moving the elastic body 1, when the elastic body is vibrated,
Structured so that a moving body can slide in a predetermined direction
It is.

In the embodiment shown in FIG. 4, when an electric field is applied to a cylindrical piezoelectric ceramic through an electrode, radial vibrations are generated, and the vibrations are transmitted to the elastic body, and the vibrations with respect to the inclination direction of the projections are generated. The moving body is moved linearly in the feed direction by the component force.
In the figure, when the upper electrode is charged, a large driving force for sending the moving body downward is obtained by charging the lower electrode, and when the lower electrode is charged, a large driving force is obtained.

[0015]

As described above, the present invention is a reversible linear slide mechanism that utilizes the power saving and high torque characteristic of an ultrasonic vibrator while being extremely compact as described above. For example, rearview mirror
It is enabling adoption to the driving mechanism such as the actuator to be mounted on.

[Brief description of the drawings]

FIG. 1 is a sectional view illustrating an operation state of the present invention.

FIG. 2 is a perspective view of the same.

FIG. 3 is a sectional view showing a second embodiment of the same.

FIG. 4 is a sectional view showing a third embodiment of the same.

FIG. 5 is a sectional view showing a part of the fourth embodiment;

FIG. 6 is an explanatory view showing a first conventional example.

FIG. 7 is an explanatory diagram showing a second conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Linear slide mechanism, 2 ... Through-hole, 3 ... Cylindrical piezoelectric ceramics 4 ... Elastic body, 5 ... Moving body, 6 ... Projection, 7 ... Upper electrode, 8 ... Lower electrode

Claims (3)

(57) [Claims] 1. Two piezoelectric ceramics having a cylindrical shape
Are connected coaxially with a spacer in between, and the piezoelectric ceramics
A cylindrical elastic body is placed in the center opening of the box.
A predetermined angle with respect to the central axis on the inner peripheral surface of one elastic body.
A first projection piece group formed of a plurality of projection pieces inclined at an angle is formed.
On the inner peripheral surface of the other elastic body, the first projection piece group is provided.
Is a second projection consisting of a plurality of projections inclined in opposite directions.
A raised piece group is formed, and furthermore, at the central opening of each elastic body.
Is a pattern that comes into contact with the first projection piece group and the second projection piece group.
A moving body in the shape of an arrow is inserted, and an alternating voltage is applied to one of the piezoelectric ceramics.
To generate ultrasonic vibrations to move the moving body in the axial direction.
Ultrasonic linear slide mechanism characterized by being slidable in reverse . 2. A piezoelectric body having a cylindrical shape is connected coaxially with a spacer interposed therebetween, and a pipe-shaped moving body is inserted through a central opening of each piezoelectric ceramic.
Two steps covering the periphery of the electroceramics and the moving body
An elastic body having a cylindrical structure is provided for each of the piezoelectric ceramics.
And the contact point between one elastic body and the moving body is the axis of the moving body.
A first projection comprising a plurality of projection pieces inclined with respect to a direction
One group is formed, and the contact part between the other elastic body and the moving body is
A plurality of projections inclined in a direction opposite to the first projection piece group;
Forming a second projection piece group consisting of a piece , applying an alternating voltage to one of the piezoelectric ceramics to generate ultrasonic vibration, and allowing the moving body to slide reversibly in the axial direction. Ultrasonic linear slide mechanism characterized by the following. 3. A central pressure conductive ceramics to forming a tubular shape
A cylindrical elastic body is arranged in the opening, and
Insert a pipe-shaped moving object into the central opening of the
An ultrasonic vibration is generated by applying an alternating voltage to the ceramics.
, The ultrasonic linear to slide the moving body in the axial direction
In the slide mechanism, a predetermined portion is provided around the moving body with respect to the axial direction of the moving body.
An ultrasonic linear slide mechanism characterized by forming a plurality of protrusions inclined in the direction of .