JP2002199754A - Ultrasonic motor, stator and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ultrasonic motor which can prevent deterioration of performance and generation of noise, even if the planarization is attempted. SOLUTION: The ultrasonic motor is provided with a first and a second piezoelectric elements, a stator 1 which is tightened with a bolt inserted in the axial direction, with a friction member 10 thereof attached to an upper end surface 4d of an upper side metal block 4, under the condition that a first and a second electrode plates be held between the lower side and upper side metal blocks 4 and that a rotor which be pressurized in contact with the friction member 10 of stator 1 to be rotatable. The ultrasonic motor rotatingly drives the rotor 2 with composite vibration generated on the stator 1. The friction member 10 is cut at the projected portion 10, after it is tightened, so that surface processing to make the upper end surface uniformly flat.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic motor, a stator and a method for manufacturing the same.

[0002]

2. Description of the Related Art As a conventional ultrasonic motor, there is a standing wave type (so-called bolted Langevin type) as shown in FIG. This ultrasonic motor includes a stator 1 and a rotor 2. The stator 1 has a metal block 3
4, piezoelectric elements 5 and 6, electrode plates 7 and 8, and bolts 9. The members 3 to 8 are stacked in a columnar shape as shown in FIG. 7, and are connected and fixed by tightening the blocks 3 and 4 with bolts 9.

[0003] More specifically, the engagement surface 3 which is flattened by being cut out is formed at the lower end of the outer peripheral surface of each of the blocks 3 and 4.
a, 4a are four in the circumferential direction (only two are shown in FIG. 7)
They are formed at equal angle (90 °) intervals. The engaging surfaces 3a and 4a are chucked (held) by jigs (not shown), and the blocks 3 and 4 are screwed and fastened to bolts 9.

[0004] A plurality of slits (not shown) which generate torsional vibration when longitudinal vibration is excited are formed in the lower periphery of the stator 1, specifically, on the upper end of the outer peripheral surface of the lower metal block 3. . A thin friction material (lining material) 10 is attached to an annular upper end surface of the upper metal block 4.

The rotor 2 is formed in a substantially cylindrical shape, and is slidably and rotatably brought into contact with an upper surface of the stator 1, that is, a friction material 10 attached to the metal block 4 by a pressing mechanism (not shown). A plurality of slits (not shown) that generate torsional vibration when longitudinal vibration is excited are formed in the outer circumference of the rotor 2 in the circumferential direction.

In such an ultrasonic motor, the electrode plate 7,
When a high frequency voltage having a resonance frequency (a common resonance frequency of the stator 1 and the rotor 2) is applied to the piezoelectric element 8,
A longitudinal vibration is generated at 6, and a torsional vibration is generated at the slit of the metal block 3 based on the vibration. Then, the torsional vibration and the longitudinal vibration are combined to generate a composite vibration on the stator 1 (the upper end surface of the friction material 10). Also, stator 1
In the rotor 2 that is in pressure contact with the (upper end surface of the friction material 10), torsional vibration is generated in the slit based on the longitudinal vibration component of the stator 1. Then, the stator 1 and the rotor 2
The rotor 2 is rotated by the propulsive force due to the torsional vibration component.

[0007]

However, in the above-described ultrasonic motor, when the stator 1 (metal block 4) is flattened in the axial direction, the metal block 4 is plastically deformed due to stress at the time of fastening. As a result, as shown in FIG. 8, a part of the rotor contact surface (friction material 10) rises, and a protrusion 10a is formed. In addition, as shown in FIG.
Is rotated in the clockwise direction (in the direction of arrow A in FIG. 9) to fasten, the position indicated by the one-dot chain line in FIG. 9 and the position corresponding to the clockwise end of the engaging surface 4a (such as Angle (9
0 °) at four intervals). Therefore, the contact state between the stator 1 (the friction material 10) and the rotor 2 becomes uneven. This degrades motor performance (output and efficiency) and causes abnormal noise.

An object of the present invention is to provide an ultrasonic motor, a stator, and a method of manufacturing the same, which can prevent performance deterioration and generation of abnormal noise even when flattening is performed.

[0009]

According to the first aspect of the present invention, there is provided a stator in which a piezoelectric element is sandwiched between a plurality of metal blocks and fastened by a fastening member inserted in an axial direction; And a rotor rotatably pressurized and contacted with the rotor, wherein a contact surface of the stator with the rotor is surface-finished after the fastening, in an ultrasonic motor that rotationally drives the rotor by vibration generated in the stator.

According to the second aspect of the present invention, the piezoelectric element is fastened by a fastening member inserted in the axial direction while being sandwiched between the plurality of metal blocks, and a friction member is provided on one end surface in the axial direction. And an ultrasonic motor that includes a rotor that is rotatably pressed against the friction member, and that rotates the rotor by vibration generated in the stator. .

According to the third aspect of the present invention, the piezoelectric element is fastened by the fastening member inserted in the axial direction while being sandwiched between the plurality of metal blocks, and the friction member is provided on one end surface in the axial direction. A stator, comprising a rotor rotatably pressed against the friction member, an ultrasonic motor that rotationally drives the rotor by vibration generated in the stator, in the axial direction one end surface of the metal block body, After the fastening, the surface was worked, and the friction member was attached to the surface.

According to a fourth aspect of the present invention, in the stator of the ultrasonic motor, the piezoelectric element is fastened by the fastening member inserted in the axial direction while being sandwiched between the plurality of metal blocks, and one end face in the axial direction is provided. Was subjected to surface processing after the fastening.

According to the fifth aspect of the present invention, the piezoelectric element is fastened by the fastening member inserted in the axial direction while being sandwiched between the plurality of metal blocks, and the friction member is provided on one end surface in the axial direction. In the stator of the ultrasonic motor, the friction member was subjected to surface processing after the fastening.

According to the present invention, the piezoelectric element is fastened by the fastening member inserted in the axial direction while being sandwiched between the plurality of metal blocks, and the friction member is provided on one end surface in the axial direction. In the stator of the ultrasonic motor, one end surface in the axial direction of the metal block body was subjected to surface processing after the fastening, and the friction member was attached to the surface.

According to the present invention, the stator is fastened by the fastening member inserted in the axial direction in a state where the piezoelectric element is sandwiched between the plurality of metal blocks, and the stator is rotatably pressed to the stator. A method of manufacturing an ultrasonic motor that includes a rotor that is in contact with the rotor and that drives the rotor to rotate by vibration generated in the stator, wherein a surface of the stator that contacts the rotor is processed after the fastening.

According to the present invention, the piezoelectric element is fastened by the fastening member inserted in the axial direction while being sandwiched between the plurality of metal blocks, and the friction member is provided on one end surface in the axial direction. A method for manufacturing an ultrasonic motor, comprising: a rotor that is rotatably pressurized and contacted with the friction member, and rotationally drives the rotor by vibration generated in the stator. Surface processing after fastening.

According to the ninth aspect of the present invention, the piezoelectric element is fastened by the fastening member inserted in the axial direction while being sandwiched between the plurality of metal blocks, and the friction member is provided on one end surface in the axial direction. And a rotor rotatably pressed against the friction member. The method for manufacturing an ultrasonic motor for rotating the rotor by vibration generated in the stator, the method comprising: One end surface in the direction is subjected to surface processing after the fastening, and the friction member is attached to the surface.

According to a tenth aspect of the present invention, there is provided a method of manufacturing a stator of an ultrasonic motor, wherein a piezoelectric element is fastened by a fastening member inserted in an axial direction while being sandwiched between a plurality of metal blocks. Then, one end surface in the axial direction is subjected to surface processing after the fastening.

According to the eleventh aspect of the present invention, the piezoelectric element is fastened by the fastening member inserted in the axial direction while being sandwiched between the plurality of metal blocks, and a friction member is provided on one end surface in the axial direction. A method of manufacturing a stator for an ultrasonic motor, comprising: surface-treating the friction member after the fastening.

In the twelfth aspect of the present invention, the piezoelectric element is fastened by the fastening member inserted in the axial direction while being sandwiched between the plurality of metal blocks, and the friction member is provided on one end surface in the axial direction. A method of manufacturing a stator for an ultrasonic motor, comprising: subjecting an axial end surface of the metal block body to a surface processing after the fastening, and affixing the friction member to the surface.

(Operation) According to the first aspect of the present invention,
Since the contact surface of the stator with the rotor is processed after the stator is fastened, the contact state between the stator and the rotor can be uniform even if the stator is flattened in the axial direction.

According to the second aspect of the present invention, the friction member to be brought into contact with the rotor is surface-finished after the stator is fastened. Therefore, even if the stator is flattened in the axial direction, the contact between the stator and the rotor is prevented. The state can be made uniform.

According to the third aspect of the present invention, since one end surface in the axial direction of the metal block body is processed after fastening and a friction member is attached to the surface, flattening of the stator in the axial direction is achieved. Even so, the contact state between the stator and the rotor can be made uniform.

According to the fourth aspect of the present invention, the one end surface in the axial direction of the stator is surface-finished after the stator is fastened, so that even if the stator is flattened in the axial direction, it is added to the one end surface in the axial direction. The contact state with the rotor that is brought into pressure contact can be made uniform.

According to the fifth aspect of the present invention, since the friction member is surface-finished after the stator is fastened, even if the stator is flattened in the axial direction, the rotor and the rotor that come into pressure contact with the friction member can be used. Can be made uniform.

According to the sixth aspect of the present invention, one end surface in the axial direction of the metal block body is worked after fastening and a friction member is attached to the surface, so that the stator is flattened in the axial direction. Even when the friction member is in contact with the rotor under pressure, the contact state with the rotor can be made uniform.

According to the seventh aspect of the present invention, since the contact surface of the stator with the rotor is processed after the stator is fastened, even if the stator is flattened in the axial direction, the contact between the stator and the rotor can be achieved. The state can be made uniform.

According to the eighth aspect of the present invention, since the friction member to be brought into contact with the rotor is surface-finished after the stator is fastened, even if the stator is flattened in the axial direction, the contact between the stator and the rotor can be achieved. The state can be made uniform.

According to the ninth aspect of the present invention, since one end surface in the axial direction of the metal block body is processed after fastening and a friction member is attached to the surface, the flattening of the stator in the axial direction is achieved. Even so, the contact state between the stator and the rotor can be made uniform.

According to the tenth aspect, the one end surface in the axial direction of the stator is surface-finished after the stator is fastened, so that even if the stator is flattened in the axial direction, it is added to the one end surface in the axial direction. The contact state with the rotor that is brought into pressure contact can be made uniform.

According to the eleventh aspect of the present invention, since the surface of the friction member is machined after the stator is fastened, even if the stator is flattened in the axial direction, the rotor and the rotor that come into pressure contact with the friction member can be used. Can be made uniform.

According to the twelfth aspect of the present invention, one end surface in the axial direction of the metal block body is subjected to surface processing after fastening,
Since the friction member is attached to the surface, even if the stator is flattened in the axial direction, the contact state with the rotor that is brought into pressure contact with the friction member can be uniform.

[0033]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. 1, 2, and 7 to 9. FIG.
In the present embodiment, the same parts as those of the above-described conventional technology are denoted by the same reference numerals, and the description will be made with reference to the same drawings.

As shown in FIG. 7, the ultrasonic motor has a stator 1 and a rotor 2. The stator 1 is shown in FIG.
As shown in the figure, the lower metal block 3, the upper metal block 4, the first and second piezoelectric elements 5, 6, the first and second electrode plates 7, 8, the bolt 9 as a fastening member, the friction material (lining material) ) 10 and an insulating collar 11.

The lower and upper metal blocks 3, 4 are made of a conductive metal, and in this embodiment, are made of an aluminum alloy. The lower metal block 3 is formed in a substantially cylindrical shape, and at the lower end side of the outer peripheral surface, four engagement surfaces 3a which are flattened by being cut out are formed at equal angular (90 °) intervals in the circumferential direction. Have been. A female screw 3b is formed on the inner peripheral surface of the through hole of the lower metal block 3. In addition, a plurality of slits (recesses) 3c that generate torsional vibration when longitudinal vibration is excited are formed on the upper end side of the outer peripheral surface of the lower metal block 3.

The upper metal block 4 is formed in a substantially cylindrical shape having the same inner and outer diameters as the lower metal block 3, and has an engagement surface 4a which is flattened by being cut out at the lower end of the outer peripheral surface in the circumferential direction. Are formed at equal angle (90 °) intervals.
A female screw 4b is formed on the inner peripheral surface of the through hole of the upper metal block 4. Further, a constricted portion 4c is formed on the upper end side of the outer peripheral surface of the upper metal block 4 so as to reduce its outer diameter. A thin friction material 10 is attached to an annular upper end surface 4d of the upper metal block 4.

The first and second piezoelectric elements 5 and 6 are formed in a disk shape, and a through hole is formed at the center thereof. The inner diameters of the first and second piezoelectric elements 5 and 6 are set to be larger than the inner diameter of the lower metal block 3.

The first and second electrode plates 7 and 8 are formed in a disk shape, and a through hole is formed at the center thereof. The inner diameters of the first and second electrode plates 7, 8 are set to be the same as the inner diameters of the first and second piezoelectric elements 5, 6.

The bolt 9 is formed in a substantially columnar shape, and has an external thread 9a formed on the outer peripheral surface thereof. The male screw 9a is
The diameter is set such that it can be screwed with the female screws 3b, 4b of the lower and upper metal blocks 3, 4.

The insulating collar 11 is formed in a cylindrical shape with an insulating resin. The outer diameter of the insulating collar 11 is set to be the same as the inner diameter of the first and second piezoelectric elements 5 and 6, and the first and second electrode plates 7 and 8, and the inner diameter is the same as the outer diameter of the bolt 9. (The bolt 9 can be fitted inside).

The lower metal block 3 sandwiching the first and second piezoelectric elements 5 and 6 and the first and second electrode plates 7 and 8 therebetween.
And the upper metal block 4 are fastened by bolts 9 passing through the inside thereof in the axial direction. More specifically, as shown in FIG. 7, the lower metal block 3, the second electrode plate 8, the second piezoelectric element 6, the first electrode plate 7, the first piezoelectric element 5, and the upper metal block 4 are arranged in this order. They are stacked and fastened by screwing the male screw 9a of the bolt 9 to the female screw 3b, 4b of the lower and upper metal blocks 3, 4. At this time, the first
The second piezoelectric elements 5 and 6 are stacked such that the polarization directions are inverted upside down. At this time, an insulating collar 11 is provided between the inner peripheral surfaces of the first and second piezoelectric elements 5 and 6 and the first and second electrode plates 7 and 8 and the outer peripheral surface of the bolt 9.
Is interposed. Therefore, the first and second piezoelectric elements 5, 6,
The inner peripheral surfaces of the first and second electrode plates 7 and 8 and the outer peripheral surface of the bolt 9 are electrically insulated. At this time, the second
The electrode plate 8 is electrically connected to the upper metal block 4 via the lower metal block 3 and the bolt 9.

Here, the surface of the stator 1 that is in contact with the rotor 2, that is, the upper end surface of the friction material 10, is surface-finished after the lower and upper metal blocks 3 and 4 are fastened. Specifically, the lower metal block 3 and the upper metal block 4 to which the friction material 10 is attached are chucked (held) by engaging jigs (not shown) with the engagement surfaces 3 a and 4 a, and screwed to the bolt 9. It is concluded. At this time, particularly when the stator 1 (upper metal block 4) is flattened in the axial direction, the upper metal block 4 is plastically deformed by the stress at the time of fastening, and as shown in FIG. 8 and FIG. A protrusion 10a is formed on the material 10. Then, as shown by a two-dot chain line in FIG. 2, the protruding portion 10a is cut to make the upper end surface of the friction material 10 uniform and flat.

The rotor 2 is formed in a substantially cylindrical shape having the same inner and outer diameters as the lower metal block 3, and is attached to the upper surface of the stator 1, that is, the friction material 10 adhered to the upper metal block 4 by a pressing mechanism (not shown). It is in pressure contact so that it can slide and rotate. As shown in FIG. 1, a plurality of slits 2 a that generate torsional vibration when longitudinal vibration is excited are formed in the outer periphery of the rotor 2 in the circumferential direction.

In the ultrasonic motor configured as described above,
When a high-frequency voltage having a resonance frequency (a common resonance frequency of the stator 1 and the rotor 2) is applied between the first and second electrode plates 7 and 8, the first and second piezoelectric elements 5 and 6 longitudinally vibrate. Is generated, and torsional vibration is generated in the slit 3c of the lower metal block 3 based on the vibration. Then, the torsional vibration and the longitudinal vibration are combined to generate a composite vibration on the upper surface of the stator 1 that is the contact surface with the rotor 2, that is, the upper end surface of the friction material 10. Further, in the rotor 2 which is in pressure contact with the stator 1 (the upper end surface of the friction material 10), torsional vibration is generated in the slit 2a based on the longitudinal vibration component of the stator 1. Then, the rotor 2 is rotationally driven by the propulsive force of the torsional vibration component of the stator 1 and the rotor 2.

Next, the characteristic effects of the above embodiment will be described below. (1) The contact surface of the stator 1 with the rotor 2, that is, the friction material 1
0 is flattened after the lower and upper metal blocks 3 and 4 are fastened, so that the flattening of the stator 1 (upper metal block 4) in the axial direction is particularly achieved so that the friction material 10 is fastened at the time of fastening. Even if the protruding portion 10a is formed, the contact state between the stator 1 and the rotor 2 can be made uniform.
Thus, it is possible to prevent the performance (output and efficiency) of the ultrasonic motor from deteriorating and generating abnormal noise.

(2) The lower and upper metal blocks 3 and 4 have flat engagement surfaces 3a and 4a by being cut out.
Is formed. Then, the lower metal block 3 and the upper metal block 4 are engaged (clamped) with the jigs (not shown) at the engagement surfaces 3a and 4a, respectively, and screwed and fastened to the bolts 9. Therefore, stator 1 can be easily assembled.

The above embodiment may be modified and implemented as follows. In the above embodiment, the lower metal block 3 and the friction material 1
After fastening the upper metal block 4 to which "0" is stuck, the upper end surface of the friction material 10 was subjected to surface processing.
The surface of the contact surface of the stator with the rotor 2 may be processed.

For example, as shown in FIG. 3, the lower metal block 3 is fastened to the upper metal block 4 to which no friction material is attached. At this time, particularly when the stator 1 (upper metal block 4) is flattened in the axial direction, the upper metal block 4 is plastically deformed by the stress at the time of fastening, as shown in FIG. Top end face 4
A projection 4e is formed on d. Next, as shown by a two-dot chain line in FIG.
Is processed so that the upper end surface 4d becomes uniform and flat.
Then, as shown in FIG.
The friction material 21 is attached to the upper end face 4d of the.

Even in this case, even if a protrusion 4e is formed on the upper metal block 4 at the time of fastening by flattening the stator 1 (the upper metal block 4) in the axial direction, the stator 1 and the rotor 2 are in contact with each other. The state can be made uniform. Thus, it is possible to prevent the performance (output and efficiency) of the ultrasonic motor from deteriorating and generating abnormal noise.

In the above embodiment, the lower and upper metal blocks 3 and 4 are formed with the engagement surfaces 3a and 4a which are flattened by being cut out, and the engagement surfaces 3a and 4a are shown in the drawing. It is assumed that the lower metal block 3 and the upper metal block 4 are screwed and fastened to the bolts 9 by means of chucks (not held) by jigs which are not used. You may change to what is concluded.

The engaging surfaces 3a and 4a of the lower and upper metal blocks 3 and 4 may be changed to engaging portions of other shapes as long as the jig can be engaged in the rotating direction at the time of fastening. . For example, the engagement surfaces 3a, 4a may be changed to concave portions or convex portions.
Even in this case, the same effect as that of the above embodiment can be obtained.

The lower and upper metal blocks in which the engaging surfaces 3a and 4a are not formed may be changed. In this case, it is necessary to change the method (jig) for holding the lower and upper metal blocks at the time of fastening. This makes it difficult for stress to concentrate at the time of fastening, making it difficult to form the protrusion 10a on the contact surface with the rotor 2. However, even if the contact surface with the rotor 2 is slightly distorted, the stator 1 and the rotor 2 can be made uniform. Thus, it is possible to prevent the performance (output and efficiency) of the ultrasonic motor from deteriorating and generating abnormal noise.

In the above embodiment, the stator 1 has the friction material 10 attached to the upper end surface 4d of the upper metal block 4. However, the stator 1 may be changed to a stator without the friction material 10. In this case, as described in the above example,
The protruding portion 4e (see FIG. 4) of the upper metal block 4 is cut and the upper end surface 4d of the upper metal block 4 is subjected to surface processing so as to be uniformly flat (see FIG. 5). Then, the rotor is brought into pressure contact with the upper end surface 4d to manufacture an ultrasonic motor. Even in this case, even if the upper metal block 4 is formed with the protrusion 4e at the time of fastening by flattening the stator (the upper metal block 4) in the axial direction, the contact state between the stator 1 and the rotor 2 is made uniform. can do. Thus, it is possible to prevent the performance (output and efficiency) of the ultrasonic motor from deteriorating and generating abnormal noise.

The stator 1 of the above embodiment has two metal blocks (lower and upper metal blocks 3 and 4), but the number of metal blocks may be changed as appropriate. For example, three metal blocks may be provided.

The stator 1 of the above embodiment has two piezoelectric elements (first and second piezoelectric elements 5 and 6), but the number of piezoelectric elements may be changed as appropriate. For example, one or three piezoelectric elements may be provided.

The stator 1 of the above embodiment has two electrode plates (first and second electrode plates 7, 8), but the number of electrode plates may be changed as appropriate. For example, one having no electrode plate (the metal block itself serves as an electrode plate) or one having three electrode plates may be used.

In the above-described embodiment, the ultrasonic motor that rotates the rotor 2 by using the torsional vibration components of both the stator 1 and the rotor 2 is embodied. However, only the torsional vibration component generated by the stator is used. The present invention may be embodied in an ultrasonic motor that rotates the rotor by rotation, an ultrasonic motor that rotates the rotor using only a torsional vibration component generated by the rotor, or the like. Even in this case, the same effect as that of the above embodiment can be obtained.

The technical ideas that can be grasped from the above embodiments will be described below together with their effects. (A) In the ultrasonic motor according to any one of claims 1 to 3, the metal block body is formed in a substantially cylindrical shape, and has an outer peripheral surface for rotating the metal block body at the time of fastening. An ultrasonic motor, wherein an engaging portion with which the jig is engaged is formed. With this configuration, the contact state between the stator and the rotor can be made uniform, and the stator can be easily assembled.

(B) In the ultrasonic motor stator according to any one of claims 4 to 6, the metal block body is formed in a substantially cylindrical shape, and the metal block body is formed on the outer peripheral surface thereof at the time of fastening. A stator for an ultrasonic motor, wherein an engagement portion with which a jig for rotating a body is engaged is formed. With this configuration, the contact state with the rotor that is brought into pressure contact can be made uniform, and the stator can be easily assembled.

(C) In the method of manufacturing an ultrasonic motor according to any one of claims 7 to 9, the metal block body is formed in a substantially cylindrical shape, and the metal block body is formed on the outer peripheral surface thereof at the time of fastening. A method for manufacturing an ultrasonic motor, wherein an engaging portion with which a jig for rotating a block body is engaged is formed. With this configuration, the contact state between the stator and the rotor can be made uniform, and the stator can be easily assembled.

(D) A method of manufacturing a stator for an ultrasonic motor according to any one of claims 10 to 12,
The metal block is formed in a substantially cylindrical shape, and an outer peripheral surface thereof is formed with an engagement portion with which a jig for rotating the metal block at the time of fastening is formed. A method for manufacturing a stator of an ultrasonic motor. With this configuration, the contact state with the rotor that is brought into pressure contact can be made uniform, and the stator can be easily assembled.

[0062]

As described in detail above, according to the first to third aspects of the present invention, there is provided an ultrasonic motor capable of preventing deterioration of performance and generation of abnormal noise even when flattening is achieved. can do.

According to the invention of claims 4 to 6,
It is possible to provide a stator of an ultrasonic motor that can prevent deterioration of performance and generation of abnormal noise even when flattening is performed.

According to the invention of claims 7 to 9,
It is possible to provide a method of manufacturing an ultrasonic motor that can prevent deterioration of performance and generation of abnormal noise even when flattening is performed.

According to the tenth to twelfth aspects of the present invention, there is provided a method of manufacturing a stator of an ultrasonic motor which can prevent deterioration of performance and generation of abnormal noise even when flattening is performed. Can be.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an ultrasonic motor according to an embodiment.

FIG. 2 is an enlarged view of a main part of the ultrasonic motor according to the embodiment.

FIG. 3 is an explanatory diagram for explaining an ultrasonic motor according to another example.

FIG. 4 is an explanatory diagram for explaining an ultrasonic motor according to another example.

FIG. 5 is an explanatory diagram for explaining an ultrasonic motor according to another example.

FIG. 6 is an explanatory diagram for explaining an ultrasonic motor according to another example.

FIG. 7 is a longitudinal sectional view of a main part of the ultrasonic motor.

FIG. 8 is an enlarged view of a main part of the ultrasonic motor.

FIG. 9 is an explanatory diagram for explaining a protruding portion of a rotor contact surface of a stator.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Stator, 2 ... Rotor, 3, 4 ... Lower and upper metal block (metal block body), 5, 6 ... 1st and 2nd piezoelectric element (piezoelectric element), 9 ... Bolt (fastening member), 10,
21: friction material (friction member), 4d: upper end surface of the upper metal block (one end surface in the axial direction).

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5H680 AA01 AA06 AA18 AA19 BB04 BB16 CC03 DD01 DD14 DD23 DD27 DD37 DD53 DD55 DD66 DD72 DD88 DD92 DD93 FF04 FF11 FF12 FF32 GG25

Claims (12)

[Claims] A stator (1) which is fastened by a fastening member (9) inserted in an axial direction in a state where a piezoelectric element (5, 6) is sandwiched between a plurality of metal blocks (3, 4). An ultrasonic motor, comprising: a rotor (2) rotatably press-contacted with the stator (1); and an ultrasonic motor that rotationally drives the rotor (2) by vibration generated in the stator (1). The contact surface of 1) with the rotor (2) is
An ultrasonic motor having a surface processed after the fastening. 2. A state in which the piezoelectric element (5, 6) is sandwiched between a plurality of metal blocks (3, 4) and fastened by a fastening member (9) inserted in the axial direction. A stator (1) provided with a friction member (10); and a rotor (2) rotatably press-contacted with the friction member (10). An ultrasonic motor for rotating a rotor (2), wherein the friction member (10) is subjected to surface processing after the fastening. 3. The piezoelectric element (5, 6) is fastened by a fastening member (9) inserted in the axial direction in a state sandwiched between the plurality of metal blocks (3, 4), and attached to one end surface in the axial direction. A stator provided with a friction member (21); and a rotor (2) rotatably pressed against the friction member (21), wherein the rotor (2) is rotated by vibration generated in the stator. In the ultrasonic motor to be driven, one end surface (4d) in the axial direction of the metal block body (4)
, A surface processing after the fastening, and the friction member (21) is affixed to the surface thereof. 4. A stator of an ultrasonic motor, wherein a piezoelectric element (5, 6) is fastened by a fastening member (9) inserted in an axial direction in a state sandwiched between a plurality of metal blocks (3, 4). 3. The stator for an ultrasonic motor according to claim 1, wherein one end surface in the axial direction is processed after the fastening. 5. The piezoelectric element (5, 6) is fastened by a fastening member (9) inserted in the axial direction while being sandwiched between the plurality of metal blocks (3, 4), and one end face in the axial direction (9). 4
d) An ultrasonic motor stator comprising a friction member (10) provided thereon, wherein the friction member (10) is subjected to a surface processing after the fastening. 6. The piezoelectric element (5, 6) is fastened by a fastening member (9) inserted in the axial direction while being sandwiched between the plurality of metal blocks (3, 4), and is attached to one end surface in the axial direction. In the stator of the ultrasonic motor provided with the friction member (21), one end surface (4d) in the axial direction of the metal block body (4).
, A surface processing after the fastening, and the friction member (21) is affixed to the surface thereof. 7. A stator (1) which is fastened by a fastening member (9) inserted in the axial direction in a state where the piezoelectric elements (5, 6) are sandwiched between a plurality of metal blocks (3, 4). A rotor (2) rotatably press-contacted with the stator (1), wherein the rotor (2) is driven to rotate by vibrations generated in the stator (1). The contact surface of the stator (1) with the rotor (2)
A method of manufacturing an ultrasonic motor, wherein a surface is processed after the fastening. 8. A state in which the piezoelectric element (5, 6) is sandwiched between a plurality of metal blocks (3, 4), and is fastened by a fastening member (9) inserted in the axial direction. A stator (1) provided with a friction member (10); and a rotor (2) rotatably press-contacted with the friction member (10). A method for manufacturing an ultrasonic motor that rotationally drives a rotor (2), wherein the friction member (10) is subjected to surface processing after the fastening. 9. A state in which the piezoelectric element (5, 6) is sandwiched between a plurality of metal blocks (3, 4), and is fastened by a fastening member (9) inserted in the axial direction. A stator provided with a friction member (21); and a rotor (2) rotatably pressed against the friction member (21), wherein the rotor (2) is rotated by vibration generated in the stator. A method for manufacturing an ultrasonic motor to be driven, wherein one end surface (4d) in an axial direction of the metal block body (4).
A surface processing after the fastening, and affixing the friction member (21) to the surface thereof. 10. An ultrasonic motor stator comprising a piezoelectric element (5, 6) sandwiched between a plurality of metal blocks (3, 4) and fastened by a fastening member (9) inserted in the axial direction. The method of manufacturing a stator for an ultrasonic motor according to claim 1, wherein one end surface in the axial direction is subjected to surface processing after the fastening. 11. The piezoelectric element (5, 6) is fastened by a fastening member (9) inserted in the axial direction in a state sandwiched between the plurality of metal blocks (3, 4), and is attached to one end surface in the axial direction. A method for manufacturing a stator for an ultrasonic motor, comprising a friction member (10), wherein the friction member (10) is subjected to surface processing after the fastening. 12. A state in which the piezoelectric element (5, 6) is sandwiched between a plurality of metal blocks (3, 4) and fastened by a fastening member (9) inserted in the axial direction. A method for manufacturing a stator for an ultrasonic motor, comprising a friction member (21), wherein one end surface (4d) in an axial direction of the metal block (4) is provided.
After the fastening, and affixing the friction member (21) to the surface thereof.