JPH11122959A - Friction material for vibration wave, motor, and the vibration wave motor and equipment using the friction material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the stable rotation of a contact unit and prevent the contact unit from sticking to the vibration unit of a vibration wave motor, regardless of the frictional heat and humidity by a method wherein the frictional contact part of the contact unit which is brought into frictional contact with the vibration unit and moved by relatively vibration is made of resin composition, which contains heat-resistant resin and a titanate system coupling agent. SOLUTION: A rod-shaped vibration unit 11, and a contact unit 1 which is a moving unit brought into contact with the top end part of the vibration unit 11, are provided. If positinonal phase differences between annular piezoelectric devices 3-6 which are the electro-mechanical conversion devices of the vibration unit, and time phase differences between AC voltages applied to the piezoelectric devices from an electrode board are selected properly, circular or elliptical motions of the surface particles of a driving plane 10 of the vibration unit 11 are formed, and the contact unit 1 pressed against the driving plane 10 is driven to be rotated. The contact unit 1 is pressed against the driving plane 10 of the vibration unit 11 with a load of, for instance, 300 gw to obtain friction force. If friction material 12 such as a liquid resin composition is sprayed onto the frictional contact plane and cured by a heat treatment to form a film, stable rotation is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction material for a vibration wave motor, a vibration wave motor and a device using the same.

[0002]

2. Description of the Related Art In general, a vibration wave motor or the like causes a surface particle of a vibrating body to make a circular or elliptical motion and frictionally drives a contact body pressed against the particle. Therefore, the output of the vibration wave motor can be more efficiently obtained by providing a material having a large friction coefficient as the friction material in the pressure contact portion of the vibrating body and the contact body. Further, since the wear of the friction material directly leads to the life of the vibration wave motor, a material with a small wear is desirable. Therefore, various organic materials, inorganic materials, and metallic materials have been conventionally proposed as friction materials.

Specifically, alkyd resins, polyester resins, acrylic resins, amino resins, polyamide resins, polyimide resins, epoxy resins, phenol resins, urea resins, polyurethane resins, polyamide imide resins, polyether imide resins, silicone resins, A friction material using a heat-resistant resin such as a fluororesin as a base material has been proposed.

However, the above-mentioned friction material does not have a well-balanced condition such as the magnitude of friction coefficient, stability, abrasion resistance, and start-up stability. If left unattended, the vibrating body and the contact body adhere to each other via the friction material, and a phenomenon that the vibration wave motor cannot be started (hereinafter referred to as “adsorption”) occurs.

[0005]

Since the output of the vibration wave motor depends on the frictional force, if a material having a high coefficient of friction is used as a friction material to obtain a high output, the friction is severe. As a result, a change in the shape of the friction material itself or an adverse effect due to the generation of abrasion powder causes deterioration of motor characteristics such as a decrease in starting torque and a change in the number of revolutions, resulting in a short life.

Further, when a material such as ethylene tetrafluoride is used alone as a heat-resistant resin for the base material in order to enhance the durability, it must be added in a large amount in order to improve the effect. As a result, there are drawbacks in that the coefficient of friction is small and high output cannot be obtained, and that a large amount is added, whereby the mechanical strength is weakened and the wear itself is severe.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, to obtain a stable rotation, to prevent suction between a vibrating body and a contact body regardless of frictional heat and moisture, and to prevent suction. As a result, it was possible to reduce the amount of additives to
An object of the present invention is to provide a friction material for a vibration wave motor that can increase mechanical strength and secure stable startability, and a vibration wave motor and a device using the same.

[0008]

That is, the present invention provides a vibrating body for generating vibration of a vibration wave motor, and a frictional contact between the vibrating body and the contact body which moves in relative contact with the vibrating body by the vibration. A friction material for a vibration wave motor, wherein the friction material is a friction material used for a part, and is made of a resin composition containing a heat-resistant resin and a titanate-based coupling agent.

Further, the present invention provides a vibration member for generating vibration of a vibration wave motor, and a friction material used for a friction contact portion of a contact member which comes into frictional contact with the vibration member and moves relatively to the vibration member by the vibration. A friction material for a vibration wave motor, comprising a resin composition containing a heat-resistant resin, a fluorine compound and a titanate-based coupling agent.

The present invention also provides a vibration wave motor having a vibrating body for generating vibration, and a contact body that comes into frictional contact with the vibrating body and moves relative to the vibrating body by the vibration.
A vibration wave motor, wherein the friction material for the vibration wave motor is provided on at least one friction contact portion of the vibration body or the contact body. Further, the present invention is an apparatus provided with the above-mentioned vibration wave motor as a driving source.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
The friction material for a vibration wave motor according to the present invention includes a vibration member that generates vibration of the vibration wave motor, and a friction member that is in frictional contact with the vibration member and is used as a friction contact portion of a contact member that moves relatively to the vibration member by the vibration. A specific resin composition is used for the friction material.

That is, the friction material for the vibration wave motor of the present invention is made of a material composed of a resin composition containing a heat-resistant resin and a titanate-based coupling agent (hereinafter referred to as a resin composition A). It is characterized by.

The heat-resistant resin contained in the resin composition used for the friction material of the present invention includes alkyd resin, polyester resin, acrylic resin, amino resin, polyamide resin, polyimide resin, epoxy resin, phenol resin,
One or two or more resins selected from urea resins, polyurethane resins, polyamide imide resins, polyether imide resins, silicone resins, and fluorine resins. Since these resins have high durability, heat resistance, and hydrophobicity, friction characteristics optimal for a vibration wave motor can be obtained. The heat-resistant resin is used as a base material, and the content in the resin composition is determined by the ratio with other components and is not particularly limited, but is usually in the range of 70 to 100% by weight.

Resin composition A used for the friction material of the present invention
Examples of the titanate-based coupling agent contained in are: isopropyl triisostearoyl titanate, isopropyl tri-N-dodecylbenzenesulfonyl titanate, isopropyl tri (dioctyl pyrophosphate) titanate, tetraisopropyl bis (dioctyl phosphite) titanate, tetraoctyl Bis (ditridecylphosphite) titanate, tetra (2,2-
Diallyloxymethyl-1-butyl) bis (di-tridecyl) phosphite titanate, bis (dioctylpyrophosphate) oxyacetate titanate, bis (dioctylpyrophosphate) ethylene titanate, isopropyltrioctanoyl titanate, isopropyldimethacryloyl isostearyl titanate, One or more compounds selected from isopropyl isostearyl diacryl titanate, isopropyl tri (dioctyl phosphate) titanate, isopropyl tricumyl phenyl titanate, isopropyl tri (N-aminoethyl-aminoethyl) titanate and the like are used.

In the present invention, the content of the titanate coupling agent in the resin composition A is 0.1 to 20% by weight, preferably 0.1 to 10% by weight, more preferably 0.1 to 3% by weight. Is desirable. If it is less than 0.1% by weight,
The effect of preventing the friction material from being adsorbed and the durability cannot be obtained, and if it exceeds 20% by weight, the strength of the resin composition is undesirably reduced.

The friction material for a vibration wave motor of the present invention may use the above-mentioned titanate-based coupling agent and a fluorine compound in combination. In this case, the above-mentioned heat-resistant resin, fluorine compound and titanate A material composed of a resin composition containing a system coupling agent (hereinafter referred to as resin composition B) is used.

The resin composition B used for the friction material of the present invention
As the fluorine compound contained in, for example, potassium borofluoride, potassium aluminum tetrafluoride, silver hexafluoroantimonate, sodium hexafluoroantimonate, potassium hexafluorophosphate, ammonium hexafluorophosphate,
Lithium hexafluorophosphate, lead borofluoride, tin borofluoride, copper borofluoride, zinc borofluoride, nickel borofluoride, sodium borofluoride, ammonium borofluoride, borofluoric acid, ferrous borofluoride, magnesium fluoride, Lithium fluoride, potassium fluoride, calcium fluoride, aluminum fluoride, barium fluoride, chromium fluoride, potassium fluoride, magnesium fluoride, cerium fluoride, potassium fluoride titanate, potassium fluoride zirconate, fluorosilicate One or two or more compounds selected from inorganic fluorine compounds such as hydrogen acid and synthetic quartz stone are used.

In the present invention, the content of the titanate coupling agent in the resin composition B is 0.1 to 20% by weight, preferably 0.1 to 10% by weight, more preferably 0.1 to 3% by weight. % Is desirable. Further, the content of the fluorine compound is desirably 0.1 to 30% by weight, preferably 5 to 20% by weight, and more preferably 10 to 20% by weight. If the content is out of the above range, if the content is small, the effect of preventing the friction material from being adsorbed and the durability cannot be obtained, and if the content is large, the strength of the resin composition is undesirably reduced.

In particular, in the resin composition B of the present invention, by using a fluorine compound and a titanate-based coupling agent in combination, the amount of the fluorine compound used can be reduced, and the synergistic effect of both can be used. The effect of preventing the friction material from being attracted and the durability is remarkable.

The resin compositions A and B according to the present invention may further contain other additives, if necessary, in addition to the above components. As an additive, for example, the durability can be improved by adding an organic or inorganic fiber. In addition, another effect can be expected from the addition of a solid lubricant by reduction.

As described above, according to the structure of the present invention, a resin composition containing a heat-resistant resin and the above-described titanate-based coupling agent in a friction material that comes into frictional contact with at least one of a contact body and a vibration body of a vibration wave motor. Since A is used as a base material,
Extremely high heat resistance, high mechanical strength at high temperature, deformation and deterioration due to frictional heat and high temperature and high humidity atmosphere generated when the vibrating body relatively moves the contact body by friction drive,
Since there is no softening or the like, and the friction material is hydrophobic, it is possible to prevent adsorption due to moisture adsorption.

In the resin composition B used in combination with a fluorine compound and a titanate coupling agent,
There are the following advantages. In a vibration wave motor having a vibrating body that generates vibration and a contact body that comes into frictional contact with the vibrating body and moves relative to the vibrating body by the vibration, at least one of the contact body and the vibrating body has a frictional contact portion. A vibration-wave motor provided with a friction material having a heat-resistant resin containing a fluorine compound as a base material, a heat-resistant resin containing a fluorine compound in a friction contact member provided on at least one of a contact body and a vibration body. Since it is a base material, it has extremely high heat resistance, high mechanical strength at high temperatures, and deforms due to frictional heat generated when the vibrating body relatively moves the contact body by friction drive and high temperature and high humidity atmosphere No friction, deterioration, softening, etc., and the frictional contact member is hydrophobic, so that adsorption due to moisture adsorption can be prevented.

However, when the fluorine compound is added to the heat-resistant resin, the compatibility with the resin is poor, or the secondary compound is agglomerated, the dispersion of the fluorine compound is poor, and a large amount of the fluorine compound is required before the effect on the adsorption appears. Had to be added. Therefore, in the configuration of the present invention, the friction material provided on at least one of the contact body and the vibration body of the vibration wave motor in frictional contact contains the heat-resistant resin, the fluorine compound, and the titanate coupling agent together. In a configuration in which a friction material having heat-resistant resin B as a base material is provided, by using a titanate-based coupling agent, the dispersion of the fluorine compound is improved, and the affinity between the fluorine compound and the resin is also improved. Even if the addition amount of the fluorine compound is smaller than the conventional case, a hydrophobic effect can be obtained on the surface of the friction material as before, so that the inherent properties of the resin can be utilized and the physical properties of the cured product do not decrease. Optimal friction characteristics for a durable vibration wave motor can be obtained.

As described above, in the present invention, a friction material having a base material of a resin composition obtained by adding the above-mentioned titanate-based coupling agent or the titanate-based coupling agent and a fluorine compound to a heat-resistant resin in combination is used. Because we use material,
Optimal friction characteristics for the vibration wave motor can be obtained, and it is possible to prevent the suction of a size that poses a practical problem.

Next, a vibration wave motor according to the present invention is a vibration wave motor having a vibrating body for generating vibration, and a contact body which comes into frictional contact with the vibrating body and moves relative to the vibrating body by the vibration. A friction for a vibration wave motor comprising a resin composition containing the heat-resistant resin and a titanate-based coupling agent or a titanate-based coupling agent and a fluorine compound in at least one friction contact portion of the vibrator or the contact body. The material is provided.

The friction material for the vibration wave motor can be provided on either the vibrating body or the contact body, or on the frictional contact portions of both the vibrating body and the contact body.

Further, the present invention can be used for various devices using the vibration wave motor provided with the friction material as a drive source. Specific examples of devices include optical devices such as cameras,
Office equipment such as printers and copiers, power windows,
Automotive-related devices such as active suspensions.

[0028]

EXAMPLES The present invention will be specifically described below with reference to examples.

Embodiment 1 FIG. 1 is a schematic sectional view showing an embodiment of a vibration wave motor according to the present invention. In FIG. 1, the configuration of the vibration wave motor according to the present invention includes a rod-shaped vibrating body 11 and a contact body (rotor) 1 which is a moving body that comes into contact with an upper end portion as basic constituent members.
The positional phase difference between a plurality of ring-shaped piezoelectric elements 3, 4, 5, and 6 as an electro-mechanical conversion element of the vibrating body 11, and the temporal position of an AC voltage applied to the piezoelectric elements from an electrode plate (not shown). By appropriately selecting the phase difference, a circular or elliptical motion is formed on the surface particles of the driving surface 10 of the vibrating body 11, and the contact body 1 contacting the driving surface 10 is rotationally driven. That is, the contact body 1 is caused by the progressive vibration wave generated in the vibrator 11.
Is to be driven.

The vibrating body 11 is made of N 2 containing SiC particles on its surface.
Hollow vibrating body structures 2, 8 made of i-plated metal
In between, the driving piezoelectric elements 3, 4, 5, 6 and the detecting piezoelectric element 7 as an electro-mechanical conversion element for detecting the vibration state of the vibrating body 11 are arranged, and from the vibrating body structure 8 side. By fastening the fastening bolt 9 inserted into the hollow portion of the vibrating body structure 8 to the female thread of the hollow vibrating body structure 2, the piezoelectric elements 3 to 6 and the detecting piezoelectric element 7 are clamped and fixed and integrated. Oscillating body 11 is constituted.

The contact body 1 is disposed on the driving surface 10 of the vibrating body 11.
By a well-known pressure means (not shown), for example, pressure contact is performed with a load of 300 gw, and a frictional force is obtained.
A friction material 12 is provided on a friction contact surface between the contact body 1 and the vibrating body 11. The friction material 12 is, for example, the contact body 1
A liquid resin composition is sprayed on the side by air spray, and thereafter, a heat treatment as described below is performed and cured,
A film having a thickness of 30 to 40 μm was formed and provided. Thereafter, the motor was subjected to a continuous drive test in an atmosphere of a temperature of 25 ° C. and a humidity of 60% at a rotation speed of 350 rpm and an additional torque of 9 gf · cm.

FIG. 2 is an enlarged view of a portion A in FIG. 1, and is an explanatory view showing a contact body coated with a friction material according to the present invention and a vibrating body coming into contact with the contact body. FIG. 3 is an enlarged view showing a friction material 12 applied to a contact body 1 and cured, and a contact portion between a driving surface 10 of a vibrating body 11 and a circular shape having a diameter of 9 mm on the driving surface 10. , Width 0. There is a 1 mm projection 10a, and the surface thereof is plated with Ni electroless plating containing SiC powder. Then, the protrusion 10a is pressurized and in contact with the friction material 12. The friction material 12 forms a coating film on the contact body 1 by a spray method using a resin composition.
Finished by polishing to 0 μm.

As Reference Example 1, an epoxy resin composition in which potassium borofluoride, which is a fluorine compound, was added to epoxy resin in an amount of 25 wt% in advance as a friction material 12 was applied to the contact body 1 and a cured epoxy resin composition was used. As a result, the protrusion 10a is pressurized and in contact with the friction material 12. The friction material 12 is formed by forming a coating film on the contact body 1 by a spray method using an epoxy resin composition, and polishing it to about 20 μm after curing at 180 ° C. for 60 minutes.

FIG. 4 shows the effect on the adsorption of potassium borofluoride. As a condition for generating the suction, the vibration wave motor shown in FIG.
After rotating for 24 hours, in a 45 ° C, 95% environment for 24 hours
A temperature cycle was performed in which the sample was allowed to stand, and then dried at 45 ° C. and 20% for 2 hours. Then, the contact body 1 and the vibrating body 1
The maximum torque until the holding torque between 1 and 1 started to rotate smoothly after the adsorption was released was measured as the adsorption torque with a torque meter, and the relationship between the adsorption torque and the weight ratio of the added potassium borofluoride was shown. As can be seen from this figure, as the amount of potassium borofluoride added increases, the adsorption torque when adsorption occurs decreases.

Since the curing temperature of the resin is 180 ° C., the thermal decomposition temperature of the fluorine compound to be added is 200 ° C.
Although potassium borofluoride is used as described above, it is desirable to select a fluorine compound having a thermal decomposition temperature equal to or higher than the curing temperature of the resin.

Next, an epoxy resin composition cured by applying 15% by weight of potassium borofluoride to an epoxy resin to the contact body 1 and further adding 2% by weight of isopropyl triisostearoyl titanate as a titanate-based coupling agent is applied. The protrusions 10a are pressurized and in contact with the friction material 12 in the same manner as described above. The friction material 12 forms a coating film by a spray method using the epoxy resin composition for the contact body 1,
After curing at 60 ° C. for 60 minutes, polishing is performed to about 20 μm to finish. In addition, potassium borofluoride 100 ° C,
After preheating for 15 minutes, isopropyl triisostearoyl titanate was added little by little while stirring in a heated state (80 ° C.) to obtain a treated filler, which was then mixed with the epoxy resin.

FIG. 4 shows the effect of the addition of isopropyltriisostearoyl titanate on the adsorption of potassium borofluoride. The conditions for generating the adsorption are as follows: after rotating the vibration wave motor shown in FIG. 1 at 350 rpm for 3 hours, and then in an environment of 45 ° C. and 95% for 24 hours.
After that, a temperature cycle of drying at 45 ° C. and 20% for 2 hours was performed. Then, the holding torque between the contact body 1 and the vibrating body 11 is measured with a torque meter as the maximum torque until the adsorption is released and the rotation starts smoothly, and the adsorption torque and the added isopropyl triisostearoyl titanate and The relationship of the weight ratio of potassium iodide was shown. As can be seen from this figure, it can be seen that as the amount of addition of isopropyl triisostearoyl titanate and potassium borofluoride increases, the adsorption torque when adsorption occurs decreases. Also, compared to the case of adding potassium borofluoride alone,
It can be seen that when the same amount of potassium borofluoride (10% by weight) was added, the adsorption torque was reduced by about 40%.

FIG. 5 shows that the friction material of Reference Example 1 was subjected to a load torque of 9 gf ·
3 and after 100,000 rotations, the friction material 1 shown in FIG.
2 shows the relationship between the wear depth 13 of No. 2 and the amount of potassium borofluoride added. FIG. 3 is a diagram showing the wear depth of the portion of FIG.

FIG. 6 is a diagram showing the relationship between the attraction torque and the wear depth when the friction material of Reference Example 1 and the present embodiment is used. In this example, the titanate-based coupling agent was added, so that the amount of potassium borofluoride for achieving the same level of adsorption torque was small, and the strength of the epoxy resin did not decrease. The durability was improved as compared with the case where no agent was used.

Example 2 In Example 2, the contact body 1 was coated with epoxy resin in which 0.5% by weight of isopropyl triisostearoyl titanate was added as a titanate-based coupling agent, and was applied. An agent 12 was provided, and the protrusion 10a was configured to be in pressure contact with the friction material 12 as in Example 1. The friction material 12 forms a coating film on the contact body 1 by a spray method using an epoxy resin composition, and after being cured at 180 ° C. for 60 minutes, about 20 μm.
Polished to finish.

FIG. 8 shows the effect on adsorption when isopropyl triisostearoyl titanate is added. As the conditions for generating the suction, the vibration wave motor shown in FIG.
After rotating for 3 hours at 45 ° C. and 95% environment.
A temperature cycle was performed in which the sample was allowed to stand for 45 hours and then dried at 45 ° C. and 20% for 2 hours. Thereafter, the holding torque between the contact body 1 and the vibrating body 11 was measured with a torque meter as the maximum torque until the adsorption was released and the rotation started smoothly, and the adsorption torque and the weight of the added isopropyl triisostearoyl titanate were measured. The relationship of the ratio was shown. As can be seen from this figure, as the amount of isopropyltriisostearoyl titanate increases, the adsorption torque when adsorption occurs decreases.

In this embodiment, isopropyl triisostearoyl titanate is added as a titanate coupling agent. However, isopropyl tri-N-dodecylbenzenesulfonyl titanate, isopropyl tri (dioctyl pyrophosphate) titanate, tetraisopropyl bis (Dioctyl phosphite) titanate, tetraoctyl bis (ditridecyl phosphite)
Titanate, tetra (2,2-diallyloxymethyl-
1-butyl) bis (di-tridecyl) phosphite titanate, bis (dioctylpyrophosphate) oxyacetate titanate, bis (dioctylpyrophosphate) ethylene titanate, isopropyltrioctanoyl titanate, isopropyldimethacryloyl isostearyl titanate, isopropyl isostearyl dithionate The same effect as that of the present example was obtained by adding acrylic titanate, isopropyl tri (dioctyl phosphate) titanate, isopropyl tricumylphenyl titanate, isopropyl tri (N-aminoethyl-aminoethyl) titanate and the like.

In this embodiment, silicon carbide powder (SiC particles) is used as a frictional contact portion of the vibrating body with the epoxy resin.
Is used, but there is wide scope for selection of the material of the frictional contact portion of the vibrating body on the other side with respect to the friction material which is an epoxy resin or another polymer material. As long as the material is somewhat harder than the epoxy resin or other polymer material, as shown in FIGS. 2 and 3, only the relatively soft epoxy resin or other polymer material wears during friction driving, so that the wear proceeds. It becomes a stable wear state. For example, various coatings such as hard plating such as chromium, oxide ceramics such as alumina, and other nitride ceramics such as titanium nitride, and various coatings such as thermal spraying, and nitriding and quenching of metals are used as friction contact parts of other vibrators. Curing treatment may be used.

In this embodiment, aluminum is used as the contact body 1. However, in the case of aluminum, when performing spray coating, adhesion is poor and the coating is easily peeled off. Therefore, the roughness of the coating surface is roughened by shot blasting on aluminum, and the adhesion with the epoxy resin coated by alumite treatment is increased.

The present invention is also applicable to a motor of a type in which the contact body 1 is fixed and the vibrating body 11 moves by a vibration wave. In the above embodiment, the example in which the friction material is applied to the rod-shaped vibration wave motor shown in FIG. 1 has been described. A surface may be formed.

FIG. 7 is a schematic diagram of a device using the vibration wave motor shown in FIG. 1 as a driving source. 13 is a large gear 13
a large gear 13a meshes with the gear 1a of the vibration wave motor. Reference numeral 14 denotes a driven member, for example, a lens barrel, and a gear 14 provided on an outer peripheral portion.
The small gear 13b of the gear 13 meshes with a and rotates by the driving force of the motor. On the other hand, an encoder slit plate 15 is attached to the gear 13, and the rotation of the gear 13 is detected by the photocoupler 16, and the rotation and stop of the motor are controlled, for example, for autofocus.

[0047]

As described above, according to the present invention, a vibration wave motor having a vibrating body that generates vibration, and a contact body that comes into frictional contact with the vibrating body and relatively moves with the vibrating body due to the vibration. In the contact body, or at least one of the frictional contact portion of the vibrating body, a heat-resistant resin, since a friction material having a resin composition A containing a titanate-based coupling agent as a base material is provided. Stable rotation is obtained, and the effect of preventing adsorption between the vibrating body and the contact body irrespective of frictional heat and moisture can be obtained, and stable startability can be secured.

Further, in the present invention, at least one of the contact body of the vibration wave motor and the frictional contact portion of the vibration body includes:
Since a friction material having a heat-resistant resin and a resin composition B containing a fluorine compound and a titanate-based coupling agent as a base material is provided, by using a fluorine compound, adsorption of a size which is a problem in practical use is achieved. Can be prevented and at the same time, by using a titanate coupling agent,
The dispersion of the fluorine compound is improved, the affinity between the fluorine compound and the resin is also improved, and the hydrophobic effect can be obtained on the surface of the friction material even if the amount of the fluorine compound is smaller than before, so that the resin inherently Therefore, the frictional characteristics optimal for a durable vibration wave motor that does not cause deterioration in cured physical properties can be obtained.

Further, the present invention can provide an apparatus using the vibration wave motor having the above-mentioned excellent frictional characteristics.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing one embodiment of a vibration wave motor of the present invention.

FIG. 2 is an enlarged view of a portion A in FIG. 1, showing a contact body coated with a friction material and a vibrating body contacting the contact body.

FIG. 3 is a view showing a wear depth of a portion shown in FIG. 2;

FIG. 4 shows the mixing amount of the fluorine compound of Reference Example 1 according to the present invention and the adsorption torque at the time of adsorption, and the mixing amount of the fluorine compound and the adsorption torque at the time of adsorption in the case of the fluorine compound deca-titanate coupling agent of Example 1. FIG.

FIG. 5 is a graph showing the relationship between the amount of the fluorine compound added in Reference Example 1 according to the present invention and the wear depth of the friction material.

FIG. 6 is a diagram showing a relationship between a suction torque and a wear depth at the time of suction in Reference Example 1 and Example 1 according to the present invention.

FIG. 7 is a schematic diagram of a device that uses the vibration wave motor shown in FIG. 1 as a driving source.

FIG. 8 is a diagram showing the relationship between the mixing amount of a titanate-based coupling agent and the adsorption torque during adsorption according to Example 2 of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Contact body 2, 8 Vibration body structure 3, 4, 5, 6 Piezoelectric element for driving 7 Piezoelectric element for vibration detection 9 Fastening bolt 10 Driving surface 11 Vibrating body 12 Friction material 13 Wear depth

Claims (7)

[Claims] A friction material used for a vibrating body that generates vibration of a vibration wave motor and a frictional contact portion of a contact body that comes into frictional contact with the vibrating body and moves relatively to the vibrating body due to the vibration. A friction material for a vibration wave motor, comprising a resin composition containing a resin and a titanate-based coupling agent. 2. The resin composition according to claim 1, wherein the content of the titanate coupling agent is 0.1 to 20% by weight.
A friction material for a vibration wave motor as described in the above. 3. A friction material used for a frictional contact portion of a vibrating body that generates vibration of a vibration wave motor and a contact body that comes into frictional contact with the vibrating body and moves relatively to the vibrating body due to the vibration. A friction material for a vibration wave motor, comprising a resin composition containing a resin, a fluorine compound and a titanate coupling agent. 4. The resin composition according to claim 3, wherein the content of the fluorine compound is 0.1 to 30% by weight and the content of the titanate coupling agent is 0.1 to 20% by weight. Friction material for vibration wave motor. 5. The heat-resistant resin is an alkyd resin, a polyester resin, an acrylic resin, an amino resin, a polyamide resin, a polyimide resin, an epoxy resin, a phenol resin, a urea resin, a polyurethane resin, a polyamideimide resin, a polyetherimide resin, The friction material for a vibration wave motor according to any one of claims 1 to 4, comprising one or more resins selected from a silicone resin and a fluororesin. 6. A vibration wave motor having a vibrating body that generates vibration, and a contact body that comes into frictional contact with the vibrating body and moves relative to the vibrating body by the vibration, wherein at least one of the vibrating body and the contacting body is provided. 6. A method according to claim 1, wherein one of the friction contact portions is provided.
A vibration wave motor provided with the friction material according to any one of the above items. 7. An apparatus provided with the vibration wave motor according to claim 6 as a drive source.