• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    ultrasonic motor and lens apparatus including motor. an ultrasonic motor is provided comprising: a vibrator including a contact surface which is brought into contact with a member to be driven, and including a piezoelectric element attached thereto, the vibrator configured to drive the member to be driven by an excited ultrasonic vibration by the piezoelectric element; and a pressurizing unit supported by a clamping unit, the pressurizing unit configured to apply a compressive force to the vibrator so as to press the contact surface against the member to be actuated, where the pressurizing unit comprises: a pressurizing member held by the clamping unit to move in a direction perpendicular to the contact surface while being restricted from moving in a direction parallel to the contact surface; and an elastic member that applies a compressive force in the direction perpendicular to the contact surface of the vibrator, via the pressurizing member.
    公开号:BR102012019554B1
    申请号:R102012019554-2
    申请日:2012-08-03
    公开日:2021-06-15
    发明作者:Ryo Yamasaki；Makoto Oikawa
    申请人:Canon Kabushiki Kaisha；
    IPC主号:
    专利说明:

    technical field
    [0001] The present invention relates to an ultrasonic motor to drive a member to be driven by generating an ellipsoidal vibration on a pressed vibrator, and to a lens apparatus using the ultrasonic motor. Description of prior art
    [0002] An ultrasonic motor has been conventionally used as a drive source to drive, for example, a lens mechanism or a camera, taking advantage of quiet operation, low to high speed drive capability, and high shift transmission. For example, an ultrasonic motor disclosed in JP 4,652,784 includes an annular member to be driven, having an axis of rotation and multiple vibrators. Each vibrator is in a so-called pressurized contact condition with respect to the member to be actuated, in a state of being pressed against the member to be actuated. Vibrators are arranged on the ring member to be actuated at predetermined intervals. When an ultrasonic vibration is excited on the vibrator under the condition of pressurized contact, an ellipsoidal motion is generated on the vibrator in a portion in contact with the member to be actuated, so that the member to be actuated is actuated to rotate around of the rotation axis of the member to be actuated. The condition of pressurized contact of the vibrator in relation to the member to be actuated is obtained by pressing, by means of a plate spring, a portion of the vibrator corresponding to a vibration node situated close to the center of the vibrator. A pressing force of the plate spring is adjusted by a screw and an adjusting washer provided near a clamping portion of the plate spring.
    [0003] However, the ultrasonic motor disclosed in patent JP-4,652,784, includes a complicated adjustment mechanism to adjust the propensity force applied to the vibrator, with numerous components constituting the adjustment mechanism. Additionally, the plate spring of the adjusting mechanism is linearly formed which can remain within the annular shape, and therefore the plate spring has a small overall length and a high spring constant. As a result, slight adjustment of the plate spring implies a significant change in propensity force and thus fine adjustment is necessary. Invention Summary
    [0004] The present invention was made with the above situation in mind, and in an ultrasonic motor to drive a limb to be driven by an ultrasonic vibration generated on a vibrator, an appropriate propensity force is obtained without using a mechanism to adjust the force of propensity to make the vibrator come into pressurized contact with a contact surface of the member to be actuated, thus obtaining an appropriate pressurized contact condition between the vibrator and the member to be actuated.
    [0005] According to the present invention, an ultrasonic motor is provided comprising: a vibrator including a contact surface that is brought into contact with a member to be actuated, and including a piezoelectric element attached thereto, the vibrator configured to actuate the limb to be actuated by an ultrasonic vibration excited by the piezoelectric element; and a pressurizing unit supported by a clamping unit, the clamping unit configured to apply a biasing force to the vibrator so as to press the contact surface against the member to be actuated, which pressurizing unit comprises: a pressurizing member supported by the clamping unit so as to move in a direction perpendicular to the contact surface while being constrained to move in a direction parallel to the contact surface; and an elastic member that applies a biasing force in the direction perpendicular to the contact surface of the vibrator, via the pressurizing member.
    [0006] Other features of the present invention will become apparent from the following description of exemplary embodiments, with reference to the accompanying drawings. Brief description of drawings
    [0007] Figure 1 is an exploded perspective view of an ultrasonic engine according to a first embodiment of the present invention.
    [0008] Figure 2 is a perspective view to illustrate an assembled state of members illustrated in Figure 1.
    [0009] Figure 3 is an enlarged perspective view to illustrate a united state of a vibrator and a smaller base.
    [00010] Figure 4A is an enlarged cross-sectional view to illustrate the assembled state of the members according to the first embodiment.
    [00011] Figure 4B is an enlarged cross-sectional view to illustrate the assembled state of the members according to the first embodiment.
    [00012] Figure 4C is an enlarged detail view of a portion A shown in figure 4B, to illustrate vectors of components of a pressure force of an elastic member.
    [00013] Figure 5 is an enlarged cross-sectional view to illustrate a case in which a rotor and a ring base are respectively inclined.
    [00014] Figure 6 is an exploded perspective view of an ultrasonic engine according to a second embodiment of the present invention.
    [00015] Figure 7 is an enlarged cross-sectional view illustrating an assembled state of members illustrated in Figure 6.
    [00016] Description of realization modes
    [00017] Preferred embodiments of the present invention will be described in detail according to the attached drawings. First mode of realization
    [00018] Exemplary embodiments of the present invention are described below, with reference to the attached drawings. Although a rotary drive type motor formed in a unit as an actuator to drive a lens cylinder or the like of a digital camera is described as an example of an ultrasonic motor according to this embodiment, its use is not limited to This one.
    [00019] Figure 1 is an exploded perspective view of an ultrasonic engine according to a first embodiment of the present invention. In the figures, the same members are represented by the same reference symbols. As shown in Figure 1, the ultrasonic motor according to the first embodiment includes a rotor 101, a vibration plate 102, a piezoelectric element 103, a smaller base 104, a ring base 105, a pressurizing member 106 and a plate spring 107. The rotor 101 is a member to be driven, including a contact surface 101a with which a vibrator 109, described below, contacts pressurized by a pressing force. Vibration plate 102 is a member in contact with contact surface 101a under a pressurized contact condition involving a compression. The piezoelectric element 103 is strongly adhered to the vibration plate 102 with an adhesive or the like. When a voltage is applied to the piezoelectric element 103 in a state in which the piezoelectric element 103 is tightly adhered to the vibration plate 102, an ultrasonic vibration is generated so that an ellipsoidal motion can be generated on the vibration plate 102. vibration plate 102 and piezoelectric element 103 constitute the vibrator 109. In this embodiment, the vibrator 109 is provided at three points, thereby driving the rotation of the rotor 101. The smaller base 104 is a support member for supporting the vibrator 109. The base ring 105 is a clamping member for supporting the smaller base 104, the pressurizing member 106 and plate spring 107. The pressurizing member 106 is fitted in a through hole portion 105b of the base ring 105, and is restrained to move only in a direction perpendicular to the contact surface 101a of the rotor 101, thus causing the vibrator 109 to come into pressurized contact with the rotor 101 via the smaller base 104 by a force of compression of the plate spring 107 described below. The plate spring 107 serves as an elastic member, which is fixed to the ring base 105 with a screw 108 in each end portion thereof, and causes the vibrator to come into pressurized contact with the member to be actuated by a force of plate spring compression. The pressurizing member 106 and the plate spring 107 constitute a pressurizing unit of the present invention.
    [00020] As described above, the aforementioned members are mounted in a unit like an ultrasonic motor.
    [00021] Figure 2 is a perspective view to illustrate an assembled state of members illustrated in Figure 1. In Figure 2, a configuration around the vibrator 109 is the same for all three points and thus to simplify the figure, reference symbols are assigned only to one front side in the figure. As illustrated in Figure 2, at each of the three points of the ring base 105, a biasing force is applied to the vibrator 109 by the plate spring 107, which is secured with two screws 108, via the pressurizing member 106 and the base. smaller 104 and, as a result, the vibrator 109 and the contact surface 101a of the rotor 101 are in pressurized contact with each other. When actually mounting the ultrasonic motor on the lens cylinder or similar, the rotor 101 is coupled to a focusing mechanism or a zoom mechanism for driving.
    [00022] Below, details of the structural members of the ultrasonic engine will be described. Figure 3 is an enlarged perspective view to illustrate a joint state of the vibrating plate 102 and the smaller base 104 illustrated in Figures 1 and 2 as seen from the side of the rotor 101. As illustrated in Figure 3, two projection parts 102b are formed on a plate portion 102a at the center of the vibration plate 102. Upper end surfaces of the projection portions 102b, i.e. surfaces bearing on the contact surface 101a of the rotor 101, are formed on the same plane, and of In order to obtain a proper condition and confinement in relation to the contact surface, the upper end surfaces are finished as smooth surfaces by polishing or similar in a manufacturing process.
    [00023] On the other hand, the piezoelectric element 103 is strongly adhered to a rear surface side of the plate part 102a shown in Figure 3 (a surface side opposite the surface on which the two projection parts 102b are formed) with a adhesive or similar. The method of strongly adhering the piezoelectric element 103 to the rear surface side of the plate portion 102a is not limited as long as the two components are strongly adhered to each other. Piezoelectric element 103 includes multiple laminated and integrated piezoelectric element films. An application of a desired alternating current (AC) voltage to the piezoelectric element 103 formed by laminating multiple films of piezoelectric elements causes a vibration, thus exciting two modes of vibration on the vibration plate 102 having the piezoelectric element 103 strongly adhered the same. At this time, by adjusting the vibration phases of the two vibration modes to obtain a desired phase difference, an ellipsoidal motion is generated over the projection parts 102b as indicated by the arrows illustrated in figure 3. The ellipsoidal motion is generated on the vibrator 109 at three points, as illustrated in Figures 1 and 2, is transferred to the contact surface 101a of rotor 101 so that rotor 101 can be driven to rotate. Details on the aforementioned laminated structure of the piezoelectric element and the aforementioned vibration mode are substantially the same as the content described in Japanese open-ended patent application 2004-304,887. The entire contents of this patent application are incorporated herein in its entirety as presented herein.
    [00024] Two joining parts 102c for joining to the larger upper surface parts 104a formed on both sides of the smaller base 104 are formed on both ends of the vibration plate 102. Although the vibration plate 102 is joined to the smaller base 104 by welding or adhesion on the joint part 102c, the method of joining the vibration plate 102 and the smaller base 104 is not limited to the vibration plate 102 and the smaller base 104 being joined together. Two arm parts 102d are respectively formed between the two junction parts 102c and the plate part 102a, and the vibration plate 102 and the piezoelectric element 103 are fixed to the smaller base 104 via the arm parts 102d. The arm parts 102d are formed more narrowly than the plate part 102a and the junction part 102c, as shown in figure 3, to obtain such a configuration which very difficultly transfers the vibration generated on the plate part 102a for junction part 102c. In other words, a coupling configuration to prevent the vibration generated on the plate part 102a from being interrupted by the smaller base 104 which is a rigid member is obtained by the joining parts 102c. Additionally, a predetermined space 203 is formed between a flat portion 104b near the center of the smaller base 104 and a surface (not shown) of the piezoelectric element 103 facing the flat portion 104b.
    [00025] Figures 4A and 4B are enlarged cross-sectional views to illustrate the assembled state of the members, in which only a surrounding area of one of the three vibrators 109 illustrated in figure 2 is illustrated in an enlarged manner. The remaining two vibrators have the same configuration, and a description thereof is omitted.
    [00026] Figure 4A is seen in which the rotor 101 is located on the upper side, having a cutting plane on a plane including the respective centers of gravity of the upper end surfaces that come into contact with the contact surface 101a of the rotor 101 on the two projection portions 102b of the vibration plate 102 and respective normals of the upper end surfaces arising at the respective centers of gravity.
    [00027] Figure 4B illustrates a cutting plane on a plane including a center of gravity of the entire upper end surface contacting the contact surface 101a on the projection parts 102b of the vibration plate 102 shown in Figure 3 and a pattern of the contact surface 101a, and perpendicular to the view shown in Figure 4A. All top end surface refers to a surface including all two top end surfaces.
    [00028] In figures 4A and 4B, a centerline 201 is a line passing through the center of gravity of the entire upper end surface contacting the contact surface 101a on the projection parts 102b of the vibration plate and including the standard to contact surface 101a.
    [00029] The upper end surfaces of the projection parts 102b rest on the contact surface 101a of the rotor 101, and are kept in a pressurized contact condition. Additionally the joining parts 102c on both ends of the vibration plate 102 are joined to the smaller base 104 at the two upper surface parts 104a. The predetermined space 203 is then formed between the piezoelectric element 103 and the flat portion 104b of the smaller base 104.
    [00030] A hole part 104c and an elongated hole part 104d are provided on the lower surface side of the smaller base 104, and the two shaft parts 105a formed on the ring base 105 are respectively fitted thereto. A bearing part 104e is provided on the lower center of the smaller base 104. The bearing part 104e is formed as a half cylinder, in which an arc shape, illustrated in Figure 4A, extends in a depth direction of the drawing sheet. (a lateral direction in figure 4B). An upper end surface 106a of pressurizing member 106 contacts bearing portion 104e. The upper end surface 106a is formed as a flat surface, and thus the contact with the bearing part 104e is a contact line with a length in the direction of the depth of the drawing sheet in figure 4A (the lateral direction in figure 4B ). Although the bearing part 104e is formed half-cylinder, the shape of the bearing part 104e is not limited, since the bearing part 104e and the upper end surface 106a of the pressurizing member 106 can maintain the contact line of a straight line.
    [00031] The ring base 105 includes the through hole portion 105b on a surface facing the plate spring 107, as shown in figure 1, and the pressurizing member 106 contacts the plate spring 107 by being fitted in the through hole part 105b, thus cooperating with plate spring 107. The central axes of through hole part 105b and pressurizing member 106 substantially mate with centerline 201, i.e. an axial direction perpendicular to the surface of 101st contact. The plate spring 107 is deformed to contact a spherical surface portion 106b on the underside of the pressurizing member 106 in Figures 4A and 4B, in a state where the pressurizing member 106 is pressed against the smaller base 104 by an elastic force of the plate spring 107.
    [00032] The plate spring 107 needs to have a spring constant for a certain length, so as to reduce a propensity force fluctuation due to changing a deformation value. Therefore, it is desired that the plate spring 107 be as long as possible. The plate spring 107 according to the first embodiment is formed using a thin arc-shaped plate to obtain as long arc length as possible in the annular ultrasonic motor. With this structure, the fluctuation of the bias force by the plate spring 107 can be suppressed even when certain displacement of the pressurizing member 106 in the compression direction is somewhat changed. Therefore, unlike a conventional example, a mechanism to adjust the propensity force is not necessary. With the aforementioned configuration, the vibrator 109 is compressed against the rotor 101 by the plate spring 107, via the smaller base 104 and the pressurizing member 106.
    [00033] A configuration for transferring the bias force by the plate spring 107 is described below with reference to figures 4A, 4B and 4C. In the following description, a propensity force vector is a force vector including a direction and magnitude of the propensity force in the cross section of each figure.
    [00034] As illustrated in 4A, the smaller base 104 is held in contact with the pressurizing member 106 on the support part 104e. The smaller base 104 is further kept in contact with the rotor 101 in the two projection parts 102b, the center of gravity of each contact surface is located at the same distance from the center line 201 in the rotor drive direction. On the other hand, with respect to the contact between the plate spring 107 and the pressurizing member 106, the plate spring is arcuately formed in the first embodiment and thus the support parts on both ends of the plate spring 107 and a propensity force entry point (a contact point between plate spring 107 and pressurizing member 106) does not exist on a straight line. Therefore, the cross section of the plate spring when the biasing force is generated is in a state having an inclination as illustrated in Figure 4B. As a result, the input of the bias force vector into the pressurizing member 106 by the plate spring 107 can be initiated by an arrow 206a. The point of contact between the pressurizing member 106 and the plate spring 107 does not exist on the centerline 201 and, in Figure 4B, the point of contact is changed to a point 205 on the right side of the centerline 201.
    [00035] Figure 4C is an enlarged detail view of a neighborhood of point 205 in a portion A, illustrated in figure 4B. The biasing force applied to the pressurizing member 106 by the plate spring 107 is represented by the vector 206a, which is slanted relative to the centerline 201. Therefore, the biasing force vector 206a can be divided into a component vector 206b by one direction parallel to centerline 201 and a component vector 206c in a direction perpendicular to centerline 201.
    [00036] As shown in figures 4A and 4B, the pressurizing member 106 is held by the ring base 105 with a degree of freedom only in a direction substantially parallel to the center line 201. That is, the movement of the pressurizing member 106 is allowed in the direction substantially perpendicular to the plane in which the projection parts 102b and the contact surface 101a of the rotor 101 come into contact with each other, while being constrained in a direction parallel to the plane. Thereby, the bias force vector 206a applied to the pressurizing member 106 by the plate spring 107 is transferred to the smaller base 104 with a force (vector 204a) corresponding to the component vector 206b in the direction of the centerline 201.
    [00037] The contact between the projection parts 102b and the contact surface 101a is a contact surface and thus, in practice, the propensity force is evenly distributed over the plane. However, for a better understanding, the propensity force is represented as a force vector acting on a position of the plane's center of gravity. Likewise, the contact between the pressurizing member 106 and the support part 104e of the smaller base 104 is a contact line, and thus, in practice, the propensity force vector is evenly distributed over the line. However, the propensity force vector is also represented as a force vector acting on a position of the center of gravity of the line. Below, the propensity force is represented as a force vector at the center of gravity position for both surface contact and line contact.
    [00038] In addition, on a lateral surface part of the pressurizing member 106, a friction force is generated by the component vector 206c of the step-daughter propensity force vector 206a in the pressurizing member 106 by the plate spring 107, the component vector 206c acting in the direction perpendicular to the centerline 201. On the other hand, a frictional force is also generated on the clamping portions of the shaft parts 105a. These frictional forces are ignored, as they are small enough in relation to the propensity force. In practice, if the finish of the side surface is somewhat smoothed, an influence of frictional forces can be reduced to a level capable of being ignored.
    [00039] In the first embodiment, as described above, the pressurizing member 106 is substantially held on the ring base 105 in a state of certain degree of freedom in the direction of the ice 201. Therefore, the propensity force vector 204 applied to the smaller base 104 by the pressurizing member 106 can be substantially matched to the centerline 201. At this time, the magnitude of the propensity force vector 204a is equal to the component vector 206b of the propensity force vector 206a by the plate spring in direction parallel to the centerline 201. This is just because the component vector 206b of the component vector 206a works as the propensity force vector 204a. The component vector 206c of the propensity force vector 206a in the direction perpendicular to the centerline 201 affects the friction force on the lateral surface portion of the pressurizing member 106. Through the smooth finishing of the surfaces, the friction force generated between the surface side of the pressurizing member 106 and an inner surface of the through hole portion 105b is sufficiently small compared to the biasing force, and does not interfere with a smooth reciprocating motion of the pressurizing member 106. Finally, the biasing force vector applied to the contact surface 101a by one of the projection parts 102b is the propensity force vector 204b, and its magnitude is half of the propensity force vector 204a. This is because the projection parts 102b exist at two points, as shown in figure 4A. Thus, with reference to the cross-sections illustrated in Figures 4A and 4B, the load point of the input propensity force vector 206a is shifted from centerline 201, and the direction of component vector 206a is not parallel to centerline 201, but the propensity force vectors 204b and 206b can maintain an appropriate propensity force.
    [00040] As described above, in this embodiment, the smaller base 104 is not pressed by the plate spring 107 directly, but pressed via the pressurizing member 106 which is maintained to have a degree of freedom substantially only in the direction perpendicular to the contact surface 101a, i.e. a direction of a plane vector of the contact surface 101a. With this configuration, compression against the contact surface 101a in the direction perpendicular to the contact surface 101a can be achieved with a small fluctuation of the bias force by the plate spring in response to an amount of displacement in the compression direction, in spite of deformation of the plate spring 107 at the moment of compression. Therefore, the plate spring 107 can also be formed in an arc, so that the plate spring 107 can be placed inside the annular ultrasonic motor. Furthermore, as long as possible a length can be ensured and the spring constant can be reduced. As a result, the amount of deformation of the plate spring 107 can be increased at the time of compression and thus the propensity force fluctuation due to the change in the amount of deformation can be reduced, eliminating the need for the mechanism to adjust the force of propensity, unlike conventional technology.
    [00041] On the other hand, the smaller base 104 is pressed via a line-shaped contact part of the support part 104e. Therefore, in the cross section illustrated in Figure 4A, the smaller base 104 can be tilted and can maintain a proper pressurized contact condition even when tilting of a member occurs due to a dimension error at the time of manufacture or a disturbance.
    [00042] Figure 5 is a cross-sectional view in the same cross-section of the same members illustrated in f 4A, to show a case where relative rotational tilt occurs around the support part 104e of the smaller base 104 over the rotor 101 and the ring base 105 compared to the state illustrated in Figure 4A. Even in Figure 5, the projection parts 102b of the vibration plate 202 follow the contact surface 101a of the rotor 101, thus maintaining a proper pressurized contact condition. Although the ring base 105 is fitted to the smaller base 104 by the bore portion 104c, the elongated bore portion 104d and shaft portions 105a, the smaller base 104 and the ring base 105 may be relatively slanted due to a spacing. of adjustment, that is, a clamping space. Therefore, the contact surface 101a can be properly pressed on the two projection parts 102b, even when the inclination of a member occurs over the rotor 101 and the ring base 105, due to a dimension error at the time of manufacture, or even when the inclination of a limb occurs over the rotor 101 and the ring base 105, due to a vibration or a disturbance at the time of actuation.
    [00043] That is, in the cross section of figure 4A, even when the inclination, as in the case illustrated in figure 5, occurs between the members, this problem is solved by taking the support part 104e of the smaller base 104 and the member pressurizing 106 of Figure 4A to the point of contact and maintaining a tracking capability between the contact surfaces with respect to slope. On the other hand, in the cross section shown in Figure 4B, the smaller base 104 and the pressurizing member 106 are not slanted relative to each other in the lateral direction in Figure 4B by displacement of the support part 104e of the smaller base 104 and the member. of pressurization 106 for the contact line of a straight line.
    [00044] As described above, in this embodiment, the vibrator 102 is pressed against the rotor 101 via the smaller base 104 to which the vibrator 102 is joined by both ends, thereby enabling a pressurized contact between them without interfering with a vibration applied to the vibrator 102 by the piezoelectric element 103. In addition, compression on the smaller base 104 is obtained by pressing the plate spring 107 via the pressurizing member 106 which is maintained having a degree of freedom only in the direction perpendicular to the contact surface 101a and, thus, proper compression can be obtained in spite of a deformation condition of the plate spring 107. In addition, compression is obtained by the provision of the bearing part 104e on the smaller base 104 and thus a Proper pressurized contact condition can be maintained despite tilting of a limb due to a dimension error occurred at the time of manufacture or disturbance.
    [00045] Although the vibrator is held by the smaller base 104 and pressed via the smaller base 104 in the first embodiment, if the vibration node is located in the center of the vibrator as in conventional technology, the vibrator can be directly pressed into a neighborhood from the center without involving the smaller base. Second mode of realization
    [00046] A second embodiment of the present invention is an example of modification of the first embodiment, in which the three plate springs 107, respectively corresponding to the three pressurizing members 106 are integrated. With this configuration the plate spring 107 and the screw 108 can be omitted, leading to a cost saving effect.
    [00047] Figure 6 is an exploded perspective view of an ultrasonic engine according to the second embodiment of the present invention. In the figure, the same members represented by the same reference symbols, and also the same members of the first embodiment, are represented by the same reference symbols. As shown in Figure 6, a ring base 301 according to the second embodiment includes only shaft portions 105a for positioning the smaller base 104 and through hole portions 105b for securing the pressurizing members 106. A washer 302 is maintained in contact with the three pressurizing members 106. A spring washer 303 is provided for pressing the washer 302. A stationary member (not shown) is provided over an upper portion of the spring washer 303, and by placing the spring washer 303 between the stationary member and the washer 302, a wavy shape of the pressure washer 303 is clamped by a predetermined amount to generate a biasing force.
    [00048] Figure 7 is an enlarged cross-sectional view to illustrate an assembled state of members according to the second embodiment. As shown in Figure 7, the spring washer 303 is tightened by the predetermined amount and thus the bias force is transferred to the pressurizing member 106 via the washer 302. The subsequent configuration for transferring the bias force is the same as for first embodiment.
    [00049] By the way, in the first embodiment, the plate spring 107 is fixed to the ring base 105 and thus an absolute position of the ring base 105 in the direction of the center line 201 illustrated in figures 4A and 4B is determined , depending on the amount of deformation of the plate spring 107. However, in the second embodiment, the ring base 301 only plays the role of supporting the smaller base 104 and the pressurizing member 106, and the pressure washer 303 is not fixed. Thereby, the position of the ring base 301 in the direction of the centerline 201 is not determined. Therefore, when mounting the ultrasonic motor according to the second embodiment to a lens cylinder or the like, for example, the ring base 301 can be fixed to take a desired absolute position relative to a stationary tube in the cylinder. , so that the ring base 301 does not inadvertently move. Alternatively, the 301 ring base can be integrated with the stationary tube, depending on the configuration.
    [00050] Therefore, in the second embodiment, the single pressure washer 303 is normally used for the three pressurizing members 106 as an elastic member which exerts pressure against the three pressurizing members 106 and thus there is no need for a plate spring and a screw, leading to cost savings. third mode of realization
    [00051] A lens apparatus having the effect of the present invention can be obtained by employing the ultrasonic motor according to the first or second embodiment as a drive unit for driving a focusing lens or a zoom lens in the lens apparatus. lens.
    [00052] As described above, in the ultrasonic motor that drives the member to be driven by an ellipsoidal vibration generated on the vibrator, a suitable pressurized contact condition can be obtained at the contact surface by transferring a propensity force from the elastic member to the vibrator, via the pressurizing member configured to move in the direction perpendicular to the contact surface of the vibrator, and the member being actuated without using the mechanism for adjusting the propensity force, which has been used in conventional technology.
    权利要求:
    Claims (8)
    [0001]
    1. Vibrating actuator comprising: a vibrator (109) including a contact surface that is driven into contact with a first member (101), and including a piezoelectric element (103) attached thereto, the vibrator configured to cause relative movement with respect to the first member by a drive of the piezoelectric element; and a pressurizing unit (106) configured to apply a biasing force to the vibrator so as to press the contact surface against the first member by an elastic member (107, 302), wherein the vibrator comprises a vibrating plate having the contact surface provided on a side of the surface opposite the surface on which the piezoelectric element is fixed in the direction of the propensity force, characterized in that a fastening unit comprises a part of the through hole (105b) with an axial direction perpendicular to the surface of contact; and the pressurizing unit configured through the through hole portion of the clamping unit.
    [0002]
    2. Vibration actuator, according to claim 1, characterized in that the pressurizing unit comprises a contact part (106b) which is driven into a contact point with the elastic member.
    [0003]
    3. Vibration actuator according to claim 1, characterized in that the elastic member comprises an arc-shaped plate spring (107).
    [0004]
    4. Vibration actuator, according to claim 1, characterized in that the vibrator is configured to cause movement relative to the first member by an ultrasonic vibration by driving the piezoelectric element.
    [0005]
    5. Vibrating actuator comprising: a vibrator (109) configured to include a contact surface that is driven into contact with a first member (101) and a piezoelectric element (103) attached thereto, and in which the vibrator is configured to causing a movement relative to the first member by a drive of the piezoelectric element; characterized in that a clamping unit (105, 301) configured to have a through hole portion (105b) with an axial direction perpendicular to the contact surface; and a pressurizing unit (106) configured through the through hole portion of the clamping unit and connected to a second member which is connected to the vibrator, which pressurizing unit is configured to apply while being restricted to move in a direction parallel to the contact surface through a support of the clamping unit, a biasing force to the vibrator so as to press the contact surface against the first member by an elastic member, where the elastic member is normally used for at least two of the multiple pressurizing members of the pressurizing unit and applying a biasing force in the direction perpendicular to the contact surface of the vibrator through at least two of the multiple pressurizing members.
    [0006]
    6. Vibration actuator according to claim 5, characterized in that the elastic member comprises a pressure washer (302).
    [0007]
    7. Vibration actuator, according to claim 5, characterized in that the vibrator is configured to cause movement relative to the first member by an ultrasonic vibration by driving the piezoelectric element.
    [0008]
    8. Lens apparatus, characterized in that it comprises the vibration actuator as defined in any one of claims 1 to 7.
    类似技术:
    公开号 | 公开日 | 专利标题
    BR102012019554B1|2021-06-15|ULTRASOUND ENGINE AND LENS APPARATUS INCLUDING ENGINE
    BR102012019556B1|2020-11-03|ultrasonic motor and lens apparatus including motor
    TWI472143B|2015-02-01|Motor and lens unit
    JP5975614B2|2016-08-23|Ultrasonic motor and lens apparatus having the same
    US9641104B2|2017-05-02|Actuator
    US10177687B2|2019-01-08|Oscillatory wave motor
    US9653675B2|2017-05-16|Driving apparatus, lens apparatus including the same, and imaging apparatus
    JP5985004B2|2016-09-06|Vibration type motor and lens device having the same
    JP5871546B2|2016-03-01|Ultrasonic motor and lens apparatus having the same
    JP6106306B2|2017-03-29|Ultrasonic motor and lens apparatus having the same
    JP6310514B2|2018-04-11|Vibration type motor and lens device having the same
    US11201568B2|2021-12-14|Vibration actuator including vibration element, and apparatus
    JP2014209819A|2014-11-06|Driving device
    KR20190045988A|2019-05-07|Piezo actuator type axis precision control module and piezo actuator type axis precision control device
    JP2016082862A|2016-05-16|Driving device and optical device using the same
    同族专利:
    公开号 | 公开日
    US20130033152A1|2013-02-07|
    EP3098637A1|2016-11-30|
    CN105915108A|2016-08-31|
    EP2555412B1|2016-07-20|
    EP3098637B1|2019-11-06|
    KR101685362B1|2016-12-12|
    CN102916609B|2016-06-01|
    KR20160053870A|2016-05-13|
    KR101555903B1|2015-09-25|
    US9091805B2|2015-07-28|
    US9705426B2|2017-07-11|
    KR101617675B1|2016-05-03|
    US20150280615A1|2015-10-01|
    JP5744670B2|2015-07-08|
    KR20130016090A|2013-02-14|
    JP2013038877A|2013-02-21|
    BR102012019554A2|2013-10-01|
    CN105915108B|2018-04-27|
    EP2555412A3|2014-05-07|
    EP2555412A2|2013-02-06|
    CN102916609A|2013-02-06|
    KR20150035887A|2015-04-07|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    SE436675B|1975-08-12|1985-01-14|Ki Politekhnichsky I Im 50 Let|ELECTRIC ENGINE OPERATED BY PIEZOELECTRIC FORCES|
    US5136200A|1989-07-27|1992-08-04|Olympus Optical Co., Ltd.|Ultransonic motor|
    US5247220A|1989-10-20|1993-09-21|Seiko Epson Corporation|Ultrasonic motor|
    JPH04145880A|1990-10-04|1992-05-19|Olympus Optical Co Ltd|Ultrasonic motor|
    JP3179662B2|1994-09-06|2001-06-25|キヤノン株式会社|Ultrasonic motor and device having ultrasonic motor|
    JPH0947044A|1995-07-31|1997-02-14|Canon Inc|Oscillation wave driver|
    CN1148866C|2001-07-27|2004-05-05|南京航空航天大学|Straight-line suppersonic motor based on vibration in rectangular piezoelectric ceramic thin plate|
    WO2003075445A1|2002-03-04|2003-09-12|Seiko Epson Corporation|Linear actuator|
    JP4838865B2|2002-07-12|2011-12-14|セイコーインスツル株式会社|Piezoelectric motor and electronic device with piezoelectric motor|
    JP2004304887A|2003-03-28|2004-10-28|Canon Inc|Oscillatory drive unit|
    JP4504152B2|2004-09-21|2010-07-14|亀川輝代|Garbage storage machine with charging machine|
    JP4576214B2|2004-11-26|2010-11-04|オリンパスイメージング株式会社|Ultrasonic motor and lens barrel|
    US20060113867A1|2004-11-26|2006-06-01|Olympus Imaging Corp.|Vibration wave motor|
    JP4652784B2|2004-11-26|2011-03-16|オリンパスイメージング株式会社|Ultrasonic motor|
    KR100799867B1|2006-02-20|2008-01-31|삼성전기주식회사|Device for Lens Transfer|
    JP2008178250A|2007-01-19|2008-07-31|Olympus Corp|Pressing mechanism of ultrasonic resonator and ultrasonic motor|
    JP2009268240A|2008-04-24|2009-11-12|Olympus Corp|Linear drive type ultrasonic motor|
    JP5121058B2|2008-04-24|2013-01-16|オリンパス株式会社|Linear drive type ultrasonic motor|
    JP5246919B2|2008-04-24|2013-07-24|オリンパス株式会社|Linear drive type ultrasonic motor|
    JP4802313B2|2008-08-01|2011-10-26|ニッコー株式会社|Holding device for piezoelectric vibrator|
    JP5709413B2|2010-06-21|2015-04-30|キヤノン株式会社|Vibration type driving device|
    JP5744670B2|2011-08-05|2015-07-08|キヤノン株式会社|Ultrasonic motor and lens apparatus having the same|JP5744670B2|2011-08-05|2015-07-08|キヤノン株式会社|Ultrasonic motor and lens apparatus having the same|
    JP5913857B2|2011-08-05|2016-04-27|キヤノン株式会社|Ultrasonic motor and lens apparatus having the same|
    JP5975614B2|2011-09-20|2016-08-23|キヤノン株式会社|Ultrasonic motor and lens apparatus having the same|
    JP5773900B2|2012-01-30|2015-09-02|キヤノン株式会社|motor|
    JP6218501B2|2013-08-26|2017-10-25|キヤノン株式会社|Vibration wave motor|
    CN103607135B|2013-10-29|2016-06-29|南京航空航天大学|A kind of Two-degree-of-freedorotation rotation holder|
    JP6245273B2|2013-11-27|2017-12-13|株式会社村田製作所|Drive device|
    DE102013226418B3|2013-12-18|2015-04-02|Physik InstrumenteGmbh & Co. Kg|ultrasonic motor|
    CN103869459B|2014-03-07|2016-01-20|南京航空航天大学|A kind of microscope objective lens fine motion focus control|
    JP6818428B2|2016-04-28|2021-01-20|キヤノン株式会社|Vibration wave motor and equipment using it|
    JP6808345B2|2016-04-28|2021-01-06|キヤノン株式会社|Electronic devices equipped with vibration wave motors and vibration wave motors, lens barrels, imaging devices|
    CN105915113B|2016-05-17|2018-09-28|东阳市阳涛电子科技有限公司|A kind of boiler smoke power generator|
    CN107228268B|2017-01-18|2019-02-26|上海朋邦实业有限公司|A kind of monitoring camera fixed equipment|
    JP2019195233A|2018-05-01|2019-11-07|キヤノン株式会社|Vibration wave motor and driving unit with the vibration wave motor|
    JP2019221073A|2018-06-20|2019-12-26|キヤノン株式会社|Vibration wave motor and drive unit|
    EP3812848A1|2019-10-21|2021-04-28|The Swatch Group Research and Development Ltd|Measuring device for a mechanical watch|
    CN112202359B|2020-09-10|2021-09-17|南京航空航天大学|Single-mode cooperative hollow piezoelectric actuator and working method thereof|
    法律状态:
    2013-10-01| B03A| Publication of a patent application or of a certificate of addition of invention [chapter 3.1 patent gazette]|
    2018-12-11| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-12-31| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-08-11| B06A| Notification to applicant to reply to the report for non-patentability or inadequacy of the application [chapter 6.1 patent gazette]|
    2021-04-06| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-06-15| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 03/08/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2011172013A|JP5744670B2|2011-08-05|2011-08-05|Ultrasonic motor and lens apparatus having the same|
    JP2011-172013|2011-08-05|
    [返回顶部]