WO2009157405A1 - 振動アクチュエータ、それを備えるレンズ鏡筒及びカメラ - Google Patents
振動アクチュエータ、それを備えるレンズ鏡筒及びカメラ Download PDFInfo
- Publication number
- WO2009157405A1 WO2009157405A1 PCT/JP2009/061310 JP2009061310W WO2009157405A1 WO 2009157405 A1 WO2009157405 A1 WO 2009157405A1 JP 2009061310 W JP2009061310 W JP 2009061310W WO 2009157405 A1 WO2009157405 A1 WO 2009157405A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- vibration
- vibration actuator
- magnet
- pressure
- magnetic force
- Prior art date
Links
- 238000003825 pressing Methods 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 230000005284 excitation Effects 0.000 claims description 3
- 230000010355 oscillation Effects 0.000 abstract 1
- 230000007423 decrease Effects 0.000 description 8
- 239000000696 magnetic material Substances 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 244000126211 Hericium coralloides Species 0.000 description 2
- 229910052772 Samarium Inorganic materials 0.000 description 2
- 229910000828 alnico Inorganic materials 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- HFGPZNIAWCZYJU-UHFFFAOYSA-N lead zirconate titanate Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ti+4].[Zr+4].[Pb+2] HFGPZNIAWCZYJU-UHFFFAOYSA-N 0.000 description 2
- 229910052451 lead zirconate titanate Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910001172 neodymium magnet Inorganic materials 0.000 description 2
- KZUNJOHGWZRPMI-UHFFFAOYSA-N samarium atom Chemical compound [Sm] KZUNJOHGWZRPMI-UHFFFAOYSA-N 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910001374 Invar Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/10—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing rotary motion, e.g. rotary motors
- H02N2/16—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing rotary motion, e.g. rotary motors using travelling waves, i.e. Rayleigh surface waves
- H02N2/163—Motors with ring stator
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2203—Arrangements for controlling the attitude of actuators, e.g. speed, floating function
- E02F9/221—Arrangements for controlling the attitude of actuators, e.g. speed, floating function for generating actuator vibration
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/64—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
- G02B27/646—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image compensating for small deviations, e.g. due to vibration or shake
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/08—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted to co-operate with a remote control mechanism
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/10—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens
- G02B7/102—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens controlled by a microcomputer
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
- G03B13/32—Means for focusing
- G03B13/34—Power focusing
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B3/00—Focusing arrangements of general interest for cameras, projectors or printers
- G03B3/10—Power-operated focusing
Definitions
- the present invention relates to a vibration actuator, a lens barrel including the vibration actuator, and a camera.
- the vibration actuator includes a vibrating body, and the vibrating body includes an elastic body and an electromechanical conversion element.
- the vibration actuator expands and contracts the electromechanical conversion element by a drive signal, and generates a progressive vibration wave (hereinafter referred to as a traveling wave) on the driving surface of the elastic body by using the expansion and contraction. Due to this traveling wave, an elliptical motion is generated on the drive surface of the vibrating body, and the relative movement member in pressure contact with the wavefront of the elliptical motion is driven.
- a vibration actuator changes its drive characteristics from a normal temperature state in a high or low temperature environment.
- a sensor electrode is provided on the piezoelectric body (electromechanical transducer) that constitutes the vibration body, the temperature of the vibration body is detected, and the speed control of the moving body (relative movement member). Is disclosed (for example, see Patent Document 1).
- An object of the present invention is to provide a vibration actuator having stable driving characteristics, a lens barrel and a camera including the vibration actuator with a simple structure.
- the present invention solves the above problems by the following means.
- a relative movement member that is brought into pressure contact with the vibration member and moves relative to the vibration member by vibration of the vibration member, and the vibration member and the relative movement member are added.
- a vibration actuator comprising: a pressure member that is brought into pressure contact; and a magnetic force generation unit that adjusts the pressure applied by the pressure member by a magnetic force.
- the pressure member includes an elastic member that pressurizes the vibration member toward the relative movement member
- the magnetic force generator includes A vibration actuator characterized in that a magnetic force is generated in a direction to suppress the pressing of the elastic member.
- the magnetic force generator includes a magnetic body and a magnet, and the elastic member is disposed between the magnetic body and the magnet.
- the magnet is a permanent magnet.
- the vibration member is disposed on a side opposite to the magnetic body with respect to the magnet. It is.
- a sixth aspect of the present invention is the vibration actuator according to the fifth aspect, wherein the relative movement member is disposed on a side opposite to the magnet with respect to the vibration member. is there.
- the vibration member includes an electromechanical conversion element that converts electrical energy into mechanical energy, and the electromechanical conversion element.
- the vibration actuator is characterized in that it has an elastic body that generates the vibration by the excitation of, and the electromechanical conversion element is provided on the opposite side of the relative movement member with respect to the elastic body.
- the invention according to an eighth aspect is a lens barrel including the vibration actuator according to any one of the first to seventh aspects.
- a ninth aspect of the present invention is a camera comprising the vibration actuator according to any one of the first to seventh aspects.
- the said structure may be improved suitably, and at least one part may substitute for another structure.
- a vibration actuator having stable driving characteristics, a lens barrel and a camera including the vibration actuator with a simple structure.
- an ultrasonic motor 10 using vibration in an ultrasonic region will be described as an example of a vibration actuator.
- FIG. 1 is a diagram showing a camera 1 having an ultrasonic motor 10 of the present embodiment.
- the camera 1 includes a camera body 2 having an image sensor 6 and a lens barrel 3.
- the lens barrel 3 is an interchangeable lens that can be attached to and detached from the camera body 2.
- the camera 1 shows an example in which the lens barrel 3 is an interchangeable lens.
- the present invention is not limited to this, and may be a lens barrel integrated with the camera body, for example.
- the lens barrel 3 includes a lens 4, a cam barrel 5, an ultrasonic motor 10, and the like.
- the ultrasonic motor 10 has a substantially annular shape, and is disposed in the lens barrel 3 so that the center axis direction of the ring substantially coincides with the optical axis direction (the direction of arrow A in FIG. 1).
- the ultrasonic motor 10 is used as a driving source for driving the lens 4 during the focusing operation of the camera 1.
- the driving force obtained from the ultrasonic motor 10 is transmitted to the cam cylinder 5.
- the lens 4 is cam-engaged with the cam cylinder 5, and when the cam cylinder 5 is rotated by the driving force of the ultrasonic motor 10, the lens 4 is moved in the optical axis direction by the cam engagement with the cam cylinder 5, Focus adjustment is performed.
- FIG. 2 shows a cross section of the ultrasonic motor 10 in the direction of the center axis of the ring.
- the ultrasonic motor 10 includes a vibrator 11, a moving body 14, a buffer member 15, a support body 16, a buffer member 17, and a pressure member 18.
- the vibrator 11 is a substantially ring-shaped member, and includes an elastic body 12 and a piezoelectric body 13.
- the elastic body 12 is a substantially ring-shaped member formed using a metal material that can be elastically deformed, such as an iron alloy such as stainless steel or invar material, or brass.
- a piezoelectric body 13 is provided on one end face of the elastic body 12.
- the front end surface of the comb tooth portion 12 b is a driving surface that drives the moving body 14 by generating a traveling wave due to excitation of the piezoelectric body 13.
- Piezoelectric body 13 is an electromechanical transducer that converts electrical energy into mechanical energy.
- the piezoelectric body 13 is formed using PZT (lead zirconate titanate) and bonded to the elastic body 12 using a conductive adhesive or the like.
- An electrode (not shown) electrically connected to a flexible printed board (not shown) is formed on the piezoelectric body 13. The piezoelectric body 13 is excited by a drive signal supplied from the flexible printed board.
- the moving body 14 is a substantially ring-shaped member, and is brought into pressure contact with the driving surface of the elastic body 12 by the pressure of the pressing member 18 described later, and is frictionally driven by the traveling wave of the elastic body 12.
- the buffer member 15 is a substantially ring-shaped member formed using rubber or the like.
- the buffer member 15 is a member that prevents the vibration of the moving body 14 from being transmitted to the support body 16 side, and is provided between the moving body 14 and the support body 16.
- the support 16 is a member that supports the moving body 14.
- the support body 16 is a member that rotates integrally with the moving body 14 to transmit the rotational motion of the moving body 14 to a driven member (not shown) and regulates the position of the moving body 14 in the rotation center axis direction. is there.
- the buffer member 17 is a substantially ring-shaped member formed using a nonwoven fabric, felt, or the like.
- the buffer member 17 is a member that prevents the vibration of the vibrator 11 from being transmitted to the pressure member 18 side, and is provided between the piezoelectric body 13 and the pressure member 18.
- the pressurizing member 18 is a member that is made of an elastic member such as a spring, and that generates pressure to bring the vibrator 11 into pressure contact with the moving body 14.
- the pressure member 18 includes a spring member 18b, and a pressure plate 18a and a pressure plate 18c disposed at both ends thereof.
- the spring member 18b uses a disc spring in this embodiment.
- the spring member 18b is not limited to a disc spring, and may be, for example, an annular member formed in a wave shape along the circumference as long as it can be expanded and contracted in the vertical direction in the figure.
- the pressure plate 18a is a substantially ring-shaped plate member made of a permanent magnet.
- the material of the permanent magnet is not limited to these, but is a ferrite magnet, a samarium / cobalt magnet, a neodymium magnet, an alnico magnet, or the like.
- the holding plate 18 c is a substantially ring-shaped plate member made of a magnetic material, and has a function of fixing the ultrasonic motor 10 to the lens barrel 3.
- a magnetic substance means the substance which can be magnetized easily.
- the pressure plate 18a is made of a permanent magnet and the pressing plate 18c is made of a magnetic material, a magnetic force is generated between the pressing plate 18a and the pressing plate 18c.
- the strength of the magnetic force changes depending on the environmental temperature, and the amount M of change in the magnetic force of the permanent magnet due to the temperature change is expressed by the following equation.
- M ⁇ ⁇ ⁇ ⁇ t ⁇ M
- M is the magnetic force of the permanent magnet at normal temperature
- ⁇ is the temperature coefficient (%) of the permanent magnet
- ⁇ t is the difference between the normal temperature and the actual temperature.
- the temperature coefficient ⁇ is ⁇ 0.18 for ferrite magnets, ⁇ 0.03 for samarium / cobalt magnets, ⁇ 0.12 for neodymium magnets, and ⁇ 0.02 for alnico magnets. Since these temperature coefficients are negative, the magnetic force between the pressure plate 18a and the pressing plate 18c increases as the temperature decreases and decreases as the temperature increases.
- FIG. 3 is a diagram showing the force relationship of the pressure member 18 at (a) normal temperature, (b) low temperature, and (c) high temperature.
- the applied pressure amount in the direction in which the vibrator 11 generated by the spring member 18b is pushed toward the moving body 14 is set to 2.0 kg. This amount of pressure does not change at (a) normal temperature, (b) low temperature, and (c) high temperature.
- the magnetic force between the pressure plate 18a and the pressing plate 18c at normal temperature is 1.0 kg. Then, at normal temperature, the force with which the pressure plate 18a pushes the vibrator 11 in the direction of the moving body 14 is 1.0 kg obtained by subtracting 1.0 kg from 2.0 kg as shown in FIG.
- the magnetic force between the pressure plate 18a and the pressing plate 18c at a low temperature is larger than that at room temperature, it is set to 1.1 kg, for example. Then, the force with which the pressure plate 18a pushes the vibrator 11 toward the moving body 14 is 0.9 kg obtained by subtracting 1.1 kg from 2.0 kg as shown in FIG. That is, it becomes smaller than that at room temperature.
- the magnetic force between the pressure plate 18a and the holding plate 18c at a high temperature is smaller than that at normal temperature, and is, for example, 0.9 kg. Then, the force with which the pressure plate 18a pushes the vibrator 11 toward the moving body 14 is 1.1 kg obtained by subtracting 0.9 kg from 2.0 kg as shown in FIG. That is, it becomes larger than that at room temperature.
- the drive characteristics of the ultrasonic motor 10 change depending on the temperature change of the environment in which it is used. This is because the joint surface between the elastic body 12 and the piezoelectric body 13 is deformed due to the difference in thermal expansion coefficient between the elastic body 12 and the piezoelectric body 13 due to temperature change, or the humidity of the air in the environment in which it is used changes. This is because the friction coefficient of the frictional contact surface between the vibrator 11 and the moving body 14 changes or the capacitance of the piezoelectric body 13 changes.
- the ultrasonic motor 10 when the ultrasonic motor 10 is placed in a low temperature environment, the electrostatic capacity of the piezoelectric body 13 is reduced, and the driving force generated by the traveling wave generated by the vibrator 11 is reduced. Then, the driving force generated by the ultrasonic motor 10 is reduced. Further, in a low temperature environment, the amount of moisture in the air decreases, so the friction coefficient of the frictional contact surface between the vibrator 11 and the moving body 14 increases. For this reason, the ultrasonic motor 10 tends to have inferior starting characteristics, low-speed driving characteristics, and the like in a low temperature environment as compared to normal temperatures.
- the pressing force by which the pressure plate 18a pushes the vibrator 11 in the direction of the moving body 14 decreases as described above in a low temperature environment.
- the force that presses the moving body 14 decreases, and the moving body 14 becomes easier to rotate than at normal temperature. For this reason, the above-described decrease in driving force due to a decrease in temperature can be compensated, and a change in driving characteristics with respect to normal temperature can be reduced.
- the ultrasonic motor 10 when the ultrasonic motor 10 is placed in a high temperature environment, the electrostatic capacity of the piezoelectric body 13 increases, and the traveling wave generated by the vibrator 11 increases the driving force of the moving body 14. If it does so, the rotation speed of the mobile body 14 will rise and the driving force which the ultrasonic motor 10 emits will become large. Further, the joint surface between the elastic body 12 and the piezoelectric body 13 is deformed, and the driving of the moving body 14 is likely to become unstable. Therefore, the ultrasonic motor 10 tends to generate abnormal noise due to the vibration of the moving body 14 in a high temperature environment as compared with the normal temperature.
- the pressurizing force generated by the entire pressure member 18 increases as described above in a high temperature environment.
- the force for pressing the moving body 14 increases, and the moving body 14 is less likely to rotate than at normal temperature. For this reason, it is possible to suppress an increase in the number of rotations accompanying a temperature rise and to reduce the occurrence of abnormal noise.
- this embodiment has the following effects. (1) According to the present embodiment as described above, it is possible to compensate for the decrease in the driving force of the ultrasonic motor 10 in a low temperature environment, and to reduce the change in the driving characteristics of the ultrasonic motor 10 with respect to normal temperature. it can. In addition, it is possible to mitigate the increase in the rotational speed in a high temperature environment and reduce the occurrence of abnormal noise. In this way, it is possible to obtain a stable drive that does not depend on a temperature change in the ultrasonic motor 10. (2) Further, according to the present embodiment, adjustment of the force with which the vibrator 11 presses the moving body 14 is achieved with a simple structure in which the pressing plate 18a is made of a permanent magnet and the pressing plate 18c is made of a magnetic material. Can do. Therefore, manufacture is easy and production cost can also be suppressed.
- the present invention is not limited to the above-described embodiment, and various modifications and changes as described below are possible, and these are also within the scope of the present invention.
- the permanent magnet pressure plate 18a
- the magnetic body pressing plate 18c
- the present invention is not limited to this.
- a magnetic body pressing plate 18c
- a permanent magnet pressure plate 18a
- the ultrasonic motor 10 is disposed in the lens barrel 3 so that the center axis of the ring is substantially coincident with the optical axis direction.
- the present invention is not limited to this.
- the optical axis of the lens barrel 3 and the central axis of the ultrasonic motor 10 may be arranged differently.
- the ultrasonic motor 10 in which the moving body 14 is rotationally driven is described as an example of the vibration actuator.
- the present invention is not limited to this.
- the moving body 14 may be a linear vibration actuator that is driven in a linear direction.
- vibration actuators such as a rod type, a pencil type, and a disk type.
- the ultrasonic motor 10 using the vibration in the ultrasonic region is described as an example of the vibration actuator, but the present invention is not limited to this.
- a vibration actuator that uses vibration outside the ultrasonic region may be used.
- the ultrasonic motor 10 is used as a driving source of the lens 4 during the focusing operation of the camera 1 .
- the present invention is not limited to this.
- it may be a drive source during the zoom operation of the camera 1.
- it may be used as a drive source of a camera shake correction mechanism that drives a part of the imaging system of the camera 1 to correct camera shake.
- You may use for the drive part of a copying machine, the steering wheel tilt device of a motor vehicle, the drive part of a headrest, the drive device of a timepiece, etc.
- the embodiment and the modification can be combined as appropriate, but detailed description thereof is omitted.
- the present invention is not limited to the embodiment described above.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Optics & Photonics (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
- Lens Barrels (AREA)
Abstract
Description
請求項2に記載の発明は、請求項1に記載の振動アクチュエータにおいて、前記加圧部材は、前記振動部材を前記相対移動部材側に加圧する弾性部材を有し、前記磁力発生部は、該弾性部材の加圧を抑制する方向に磁力を発生させること、を特徴とする振動アクチュエータである。
請求項3に記載の発明は、請求項2に記載の振動アクチュエータにおいて、前記磁力発生部は、磁性体と磁石とを有し、前記弾性部材は、前記磁性体と前記磁石との間に配置されていること、を特徴とする振動アクチュエータである。
請求項4に記載の発明は、請求項3に記載の振動アクチュエータにおいて、前記磁石は永久磁石であること、を特徴とする振動アクチュエータである。
請求項5に記載の発明は、請求項3または4に記載の振動アクチュエータにおいて、前記振動部材は、前記磁石に対して前記磁性体と反対側に配置されていること、を特徴とする振動アクチュエータである。
請求項6に記載の発明は、請求項5に記載の振動アクチュエータにおいて、前記相対移動部材は、前記振動部材に対して前記磁石と反対側に配置されていること、を特徴とする振動アクチュエータである。
請求項7に記載の発明は、請求項1~6のいずれか1項に記載の振動アクチュエータにおいて、前記振動部材は、電気エネルギーを機械エネルギーに変換する電気機械変換素子と、前記電気機械変換素子の励振により前記振動を発生する弾性体を有し、前記電気機械変換素子は前記弾性体に対して前記相対移動部材と反対側に設けられていることを特徴とする振動アクチュエータである。
請求項8に記載の発明は、請求項1~請求項7のいずれか1項に記載の振動アクチュエータを備えるレンズ鏡筒である。
請求項9に記載の発明は、請求項1~請求項7のいずれか1項に記載の振動アクチュエータを備えるカメラである。
なお、上記構成は、適宜改良してもよく、また、少なくとも一部を他の構成物に代替してもよい。
M×α×Δt=ΔM
ここで、Mは常温における永久磁石の磁力、αは永久磁石の温度係数(%)、Δtは常温と実際の温度の差である。
(1)上述のように本実施形態によれば、低温環境下における超音波モータ10の駆動力の減少を補うことができ、常温時に対する超音波モータ10の駆動特性の変化を少なくすることができる。また、高温環境下における、回転数の上昇を緩和し、異音の発生を低減することができる。このように、超音波モータ10において温度変化によらない安定した駆動を得ることができる。
(2)また、本実施形態によると、振動子11が移動体14を押圧する力の調整を、加圧板18aを永久磁石、押さえ板18cを磁性体で製造するといった簡単な構造で達成することができる。したがって、製造が容易で、生産コストを抑えることもができる。
以上、説明した実施形態に限定されることなく、以下に示すような種々の変形や変更が可能であり、それらも本発明の範囲内である。
(1)本実施形態において、永久磁石(加圧板18a)をバネ部材18bの振動子11側に配置し、磁性体(押さえ板18c)をバネ部材18bにおけるその反対側に配置した。しかし本発明はこれに限定されない。磁性体(押さえ板18c)をバネ部材18bの振動子11側に配置し、永久磁石(加圧板18a)をバネ部材18bにおけるその反対側に配置してもよい。
なお、実施形態及び変形形態は、適宜組み合わせて用いることもできるが、詳細な説明は省略する。また、本発明は以上説明した実施形態によって限定されることはない。
Claims (9)
- 振動部材に加圧接触され、前記振動部材の振動により、前記振動部材との間で相対移動する相対移動部材と、
前記振動部材と前記相対移動部材とを加圧接触させる加圧部材と、
前記加圧部材の加圧力を、磁力によって調整する磁力発生部とを備えること、
を特徴とする振動アクチュエータ。 - 請求項1に記載の振動アクチュエータにおいて、
前記加圧部材は、前記振動部材を前記相対移動部材側に加圧する弾性部材を有し、前記磁力発生部は、該弾性部材の加圧を抑制する方向に磁力を発生させること、
を特徴とする振動アクチュエータ。 - 請求項2に記載の振動アクチュエータにおいて、
前記磁力発生部は、磁性体と磁石とを有し、前記弾性部材は、前記磁性体と前記磁石との間に配置されていること、
を特徴とする振動アクチュエータ。 - 請求項3に記載の振動アクチュエータにおいて、前記磁石は永久磁石であること、
を特徴とする振動アクチュエータ。 - 請求項3または4に記載の振動アクチュエータにおいて、
前記振動部材は、前記磁石に対して前記磁性体と反対側に配置されていること、
を特徴とする振動アクチュエータ。 - 請求項5に記載の振動アクチュエータにおいて、
前記相対移動部材は、前記振動部材に対して前記磁石と反対側に配置されていること、
を特徴とする振動アクチュエータ。 - 請求項1~6のいずれか1項に記載の振動アクチュエータにおいて、
前記振動部材は、電気エネルギーを機械エネルギーに変換する電気機械変換素子と、前記電気機械変換素子の励振により前記振動を発生する弾性体を有し、前記電気機械変換素子は前記弾性体に対して前記相対移動部材と反対側に設けられていることを特徴とする振動アクチュエータ。 - 請求項1~請求項7のいずれか1項に記載の振動アクチュエータを備えるレンズ鏡筒。
- 請求項1~請求項7のいずれか1項に記載の振動アクチュエータを備えるカメラ。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN200980123964.2A CN102067004B (zh) | 2008-06-23 | 2009-06-22 | 振动促动器、具有该振动促动器的透镜镜筒及相机 |
US13/000,063 US8803986B2 (en) | 2008-06-23 | 2009-06-22 | Vibration actuator, and lens barrel and camera provided with the vibration actuator |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008-163080 | 2008-06-23 | ||
JP2008163080A JP5309719B2 (ja) | 2008-06-23 | 2008-06-23 | 振動アクチュエータ、それを備えるレンズ鏡筒及びカメラ |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2009157405A1 true WO2009157405A1 (ja) | 2009-12-30 |
Family
ID=41444471
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2009/061310 WO2009157405A1 (ja) | 2008-06-23 | 2009-06-22 | 振動アクチュエータ、それを備えるレンズ鏡筒及びカメラ |
Country Status (5)
Country | Link |
---|---|
US (1) | US8803986B2 (ja) |
JP (1) | JP5309719B2 (ja) |
KR (1) | KR20110039273A (ja) |
CN (1) | CN102067004B (ja) |
WO (1) | WO2009157405A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103875168A (zh) * | 2011-11-11 | 2014-06-18 | 奥林巴斯株式会社 | 惯性驱动促动器 |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6548408B2 (ja) * | 2015-02-27 | 2019-07-24 | キヤノン株式会社 | 撮像装置及びその制御方法並びにコンピュータプログラム |
FR3042660B1 (fr) * | 2015-10-16 | 2018-04-06 | Airbus Helicopters | Actionneur electromecanique pour commandes de vol electriques d'un aeronef |
JP7313808B2 (ja) * | 2018-10-04 | 2023-07-25 | キヤノン株式会社 | レンズ装置、撮像装置及びカメラシステム |
EP3851892A1 (de) * | 2020-01-20 | 2021-07-21 | Baden-Württemberg Stiftung gGmbH | Aktuierbare optische vorrichtung, verfahren zur herstellung der vorrichtung, und verwendung einer magnetischen substanz |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6055866A (ja) * | 1983-09-02 | 1985-04-01 | Sony Corp | 弾性波モ−タ |
JPH02266879A (ja) * | 1989-04-06 | 1990-10-31 | Brother Ind Ltd | 超音波アクチュエータ |
JP2007226234A (ja) * | 2006-02-20 | 2007-09-06 | Samsung Electro-Mechanics Co Ltd | レンズ移送装置 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59185180A (ja) * | 1983-04-04 | 1984-10-20 | Canon Inc | 超音波モ−タ |
JPH02123972A (ja) * | 1988-10-28 | 1990-05-11 | Matsushita Electric Ind Co Ltd | 超音波モータ |
JP2924455B2 (ja) | 1992-06-11 | 1999-07-26 | 松下電器産業株式会社 | 超音波モータの駆動方法 |
JP3783410B2 (ja) * | 1998-05-28 | 2006-06-07 | コニカミノルタフォトイメージング株式会社 | 補正光学装置 |
US7036490B2 (en) * | 2003-01-17 | 2006-05-02 | Siemens Vdo Automotive Inc. | Elastomeric vapor flow control actuator |
JP4540354B2 (ja) * | 2004-01-30 | 2010-09-08 | Hoya株式会社 | 像ブレ補正装置 |
-
2008
- 2008-06-23 JP JP2008163080A patent/JP5309719B2/ja not_active Expired - Fee Related
-
2009
- 2009-06-22 US US13/000,063 patent/US8803986B2/en not_active Expired - Fee Related
- 2009-06-22 CN CN200980123964.2A patent/CN102067004B/zh not_active Expired - Fee Related
- 2009-06-22 KR KR1020117001500A patent/KR20110039273A/ko not_active Application Discontinuation
- 2009-06-22 WO PCT/JP2009/061310 patent/WO2009157405A1/ja active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6055866A (ja) * | 1983-09-02 | 1985-04-01 | Sony Corp | 弾性波モ−タ |
JPH02266879A (ja) * | 1989-04-06 | 1990-10-31 | Brother Ind Ltd | 超音波アクチュエータ |
JP2007226234A (ja) * | 2006-02-20 | 2007-09-06 | Samsung Electro-Mechanics Co Ltd | レンズ移送装置 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103875168A (zh) * | 2011-11-11 | 2014-06-18 | 奥林巴斯株式会社 | 惯性驱动促动器 |
CN103875168B (zh) * | 2011-11-11 | 2016-05-04 | 奥林巴斯株式会社 | 惯性驱动促动器 |
Also Published As
Publication number | Publication date |
---|---|
US20110102610A1 (en) | 2011-05-05 |
JP2010002817A (ja) | 2010-01-07 |
CN102067004B (zh) | 2014-08-06 |
JP5309719B2 (ja) | 2013-10-09 |
CN102067004A (zh) | 2011-05-18 |
KR20110039273A (ko) | 2011-04-15 |
US8803986B2 (en) | 2014-08-12 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP2006330053A (ja) | レンズ鏡胴 | |
WO2009157405A1 (ja) | 振動アクチュエータ、それを備えるレンズ鏡筒及びカメラ | |
JP4941469B2 (ja) | 振動アクチュエータ、レンズ鏡筒、カメラシステム、振動子 | |
US8283838B2 (en) | Piezoelectric linear motor offering enhanced displacement | |
JP2011095446A (ja) | リニア駆動装置 | |
JP2008289347A (ja) | 駆動装置 | |
JP5273915B2 (ja) | 振動型リニア駆動装置及びカメラレンズ | |
JP5218045B2 (ja) | 振動アクチュエータ、レンズ鏡筒、カメラシステム及び振動アクチュエータの駆動方法 | |
JP6025446B2 (ja) | 振動型アクチュエータ、撮像装置および、振動型アクチュエータを備えた装置 | |
JP7122555B2 (ja) | 光学機器用アクチュエータおよびこれを備えたレンズ鏡筒 | |
JP2010271417A (ja) | レンズ鏡筒及び撮像装置 | |
WO2016002917A1 (ja) | 振動型アクチュエータ、レンズ鏡筒、撮像装置及び自動ステージ | |
JP2012151924A (ja) | 振動体保持機構、振動モータ及びレンズ駆動装置 | |
JP5381241B2 (ja) | 振動アクチュエータ、レンズ鏡筒及びカメラ | |
JP2008289348A (ja) | 駆動装置 | |
JP2008259266A (ja) | 振動アクチュエータ、レンズ鏡筒、カメラ | |
JP5541281B2 (ja) | 振動アクチュエータ、レンズ鏡筒及びカメラ | |
JP2008259325A (ja) | 振動アクチュエータ装置、レンズ鏡筒、カメラ | |
JP6012226B2 (ja) | 振動波駆動装置及びその駆動回路 | |
JP5978646B2 (ja) | 振動波モータ、レンズ鏡筒、カメラ及び振動波モータの制御方法 | |
JP2013054171A (ja) | レンズ鏡筒およびカメラ | |
JP2011109787A (ja) | 振動アクチュエータ、レンズ鏡筒及びカメラ | |
JP2011166899A (ja) | 振動波モータ、レンズ鏡筒及びカメラ | |
WO2013161961A1 (ja) | 振動アクチュエータ及び光学機器 | |
JP2010032912A (ja) | 駆動装置及びレンズ駆動装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 200980123964.2 Country of ref document: CN |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 09770115 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 13000063 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
ENP | Entry into the national phase |
Ref document number: 20117001500 Country of ref document: KR Kind code of ref document: A |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 09770115 Country of ref document: EP Kind code of ref document: A1 |