US20050082916A1 - Lever-arm displacement-increasing device - Google Patents

Lever-arm displacement-increasing device Download PDF

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Publication number
US20050082916A1
US20050082916A1 US10/928,158 US92815804A US2005082916A1 US 20050082916 A1 US20050082916 A1 US 20050082916A1 US 92815804 A US92815804 A US 92815804A US 2005082916 A1 US2005082916 A1 US 2005082916A1
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US
United States
Prior art keywords
displacement
lever
arm
actuator element
increasing device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US10/928,158
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English (en)
Inventor
Yoshio Ohashi
Masaru Uryu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sony Corp
Original Assignee
Sony Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sony Corp filed Critical Sony Corp
Assigned to SONY CORPORATION reassignment SONY CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: URYU, MASARU, OHASHI, YOSHIO
Publication of US20050082916A1 publication Critical patent/US20050082916A1/en
Priority to US11/514,342 priority Critical patent/US7405509B2/en
Abandoned legal-status Critical Current

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    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H21/00—Gearings comprising primarily only links or levers, with or without slides
    • F16H21/10—Gearings comprising primarily only links or levers, with or without slides all movement being in, or parallel to, a single plane
    • F16H21/44—Gearings comprising primarily only links or levers, with or without slides all movement being in, or parallel to, a single plane for conveying or interconverting oscillating or reciprocating motions
    • 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
    • H02N2/02—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing linear motion, e.g. actuators; Linear positioners ; Linear motors
    • H02N2/04—Constructional details
    • H02N2/043—Mechanical transmission means, e.g. for stroke amplification

Definitions

  • the present invention relates to a lever-arm displacement-increasing device for use, for example, in a precise positioning device and a sound-generating actuator in the fields of cars, airplanes, high-precision machining, precise measuring apparatuses, and electronic apparatuses.
  • a magnetostrictive actuator has attracted interest which uses a magnetic material having magnetostrictivity and a rigidity higher than that of a piezoelectric material such as PZT, that is, which uses a magnetostrictive material.
  • the magnetostrictive material In the magnetostrictive actuator, the magnetostrictive material must be greatly displaced in order to produce great acoustic waves or oscillatory waves. However, in order to greatly displace the magnetostrictive material, a control current must be increased. This increases input power, and also increases the size of the actuator itself.
  • Japanese Unexamined Patent Application Publication No. 5-236595 discloses magnetostrictive displacement-producing devices that overcome the above problems, and that can efficiently produce a high output and a large displacement.
  • a magnetostrictive displacement-producing device according to an embodiment of the invention disclosed in this publication will now be briefly described with reference to FIG. 6 .
  • a driving mechanism is constituted by an actuator element 51 serving as a displacement-producing element having magnetostrictivity, a driving coil 52 extending in the longitudinal direction of the displacement-producing element 51 , and a support 53 made of a magnetic pole or a permanent magnet and serving as a magnetic-field generating member.
  • a control current generated by a displacement control circuit (not shown) is applied to the driving coil 52 , the driving coil 52 generates a control magnetic field, and the actuator element 51 expands and contracts in response to field changes.
  • the support 53 is made of an iron magnetic pole, the efficiency of the applied magnetic field can be increased.
  • the support 53 is a laminate composed of an iron material and a permanent magnet, a magnetic bias can be applied to the actuator element 51 , and controllability is enhanced.
  • the driving mechanism is fixed to a container 54 .
  • An action point 61 of a displacement-transmitting jig 60 in a displacement-increasing mechanism is movably attached to a displacing portion of the actuator element 51 .
  • a fulcrum 62 of the displacement-transmitting jig 60 provided in view of the lever ratio is pivotally supported by, for example, a pin.
  • a vibrating member 55 of an output section is fixed in contact with an action point 63 of the displacement-transmitting jig 60 .
  • the displacement-producing device includes many members such as the driving coil 52 , the support 53 , the actuator element 51 , and the displacement-transmitting jig 60 . Therefore, the structure is complicated, and the cost is increased.
  • the operation of the displacement-producing device will be described from the viewpoints of the fulcrum, the force point, and the action point with reference to FIG. 8 .
  • the above displacement-increasing mechanism uses a lever. As shown in FIG. 8 , the fulcrum of the lever is disposed ahead of the actuator element 51 , and cannot be moved toward the peripheral wall and the rear end of the actuator element 51 . That is, it is impossible to freely move the fulcrum of the lever.
  • Japanese Unexamined Patent Application Publication No. 10-201256 discloses a displacement-increasing mechanism having a simple structure in which the fulcrum of the lever is disposed behind the force point in order to overcome the technical problem of the above-described displacement-producing device.
  • the disclosed displacement-increasing mechanism aims to displace an output displacing portion in a direction orthogonal to the displacing direction of an actuator element and to increase the output from the output displacing portion.
  • the displacement-increasing mechanism will be briefly described with reference to FIG. 7 .
  • An actuator element 3 is stored in an actuator-holding space 104 provided in the center of a base 100 . Vibration displacement and force are produced by applying a voltage to the actuator element 3 , and press a force point 118 of a lever 109 .
  • the displacement and force applied to the force point 118 are increased and transmitted to an action-point hinge 117 of the lever 109 according to the lever principle, and turn an output displacing portion 112 , which extends in a direction orthogonal to the center axis of the base 100 , upward on a fulcrum hinge 116 . Consequently, the output displacing portion 112 is displaced in the direction orthogonal to the center axis of the base 100 .
  • this displacement-increasing mechanism will be described from the viewpoints of the fulcrum, the force point, and the action point with reference to FIG. 9 .
  • the action-point hinge is essential in order that the fulcrum may be disposed behind the force point.
  • the displacement-increasing mechanism cannot have a linear shape, but must be shaped like a box.
  • the box In order to increase the degree of freedom in positioning the fulcrum, the box must be enlarged. In other words, the housing must be enlarged, and it is necessary to increase the control current or to increase the size of the actuator element in order to move the large housing.
  • an object of the present invention is to provide a lever-arm displacement-increasing device in which the displacing direction of an output displacing portion is orthogonal to the displacing direction of an actuator element, the output displacing portion outputs a displacement larger than the displacement of the actuator element, and the position of the fulcrum can be freely determined.
  • the present invention provides a lever-arm displacement-increasing device including an actuator element; a first lever arm connected at one end to the actuator element by a connecting portion; and a second lever arm joined at one end to the other end of the first lever arm by a junction, wherein the displacing direction of the junction is orthogonal to the displacing direction of the actuator element.
  • the junction functions as a displacing portion.
  • a fulcrum is provided at the other end of the second lever arm, and is fixed offset from the connecting portion toward the actuator element.
  • first lever arm and the second lever arm are parallel to each other.
  • the lever-arm displacement-increasing device includes a plurality of units each including the first lever arm, the second lever arm, and the junction, thereby ensuring a larger displacement.
  • a displacing portion protrudes from the junction.
  • FIGS. 1A and 1B are a front view and a perspective view, respectively, of a lever-arm displacement-increasing device according to a first embodiment of the present invention
  • FIGS. 2A and 2B are explanatory views showing an operating manner of the lever-arm displacement-increasing device, respectively, when a rear end of an actuator element is aligned with the fulcrum and when the rear end is not aligned with the fulcrum;
  • FIGS. 3A and 3B are a front view and a perspective view, respectively, of a lever-arm displacement-increasing device according to a second embodiment of the present invention.
  • FIG. 4 is a perspective view of a lever-arm displacement-increasing device according to a third embodiment of the present invention.
  • FIG. 5 is a perspective view showing a case in which a plurality of lever-arm displacement-increasing devices of the present invention are stacked;
  • FIG. 6 is a schematic view of a first example of a conventional displacement-increasing device
  • FIG. 7 is a schematic view of a second example of a conventional displacement-increasing device
  • FIG. 8 is an explanatory view showing an operating manner of the first example of the conventional displacement-increasing device.
  • FIG. 9 is an explanatory view showing an operating manner of the second example of the conventional displacement-increasing device.
  • FIGS. 1A and 1B are a front view and a perspective view, respectively, of a lever-arm displacement-increasing device according to a first embodiment of the present invention.
  • a lever-arm displacement-increasing device 1 includes an actuator-holding space 14 for storing an actuator element 3 that displaces along a center axis 2 of the device.
  • the actuator element 3 is, for example, a piezoelectric, electrostrictive, or magnetostrictive element.
  • the lever-arm displacement-increasing device 1 also includes a pair of first and second upper lever arms 5 and 6 and a pair of first and second lower lever arms 7 and 8 .
  • the actuator element 3 is stored in the actuator-holding space 14 , and a rear end thereof is fixed to a fixed portion 4 . It is preferable that the fixed portion 4 have as high a strength as possible, and have a thickness more than or equal to double the thickness of the lever arms 5 , 6 , 7 , and 8 .
  • a front end of the actuator element 3 is joined to a connecting portion 9 that is made of a rigid material having a strength higher than that of the lever arms 5 , 6 , 7 , and 8 .
  • the second upper lever arm 6 and the second lower lever arm 8 are also connected at one end to the fixed portion 4 .
  • the first upper lever arm 5 and the first lower lever arm 7 are connected at one end to the rigid connecting portion 9 .
  • Fulcrums 15 are provided at the connections between the fixed portion 4 , and the second upper lever arm 6 and the second lower lever arm 8 .
  • the fulcrums 15 will be described in detail later.
  • the other end of the second upper lever arm 6 remote from the fixed portion 4 and the other end of the first upper lever arm 5 remote from the connecting portion 9 are joined at a junction 10 having a high strength and a thickness larger than the thickness of the lever arms 5 , 6 , 7 , and 8 .
  • the other end of the second lower lever arm 8 remote from the fixed portion 4 and the other end of the first lower lever arm 7 remote from the connecting portion 9 are joined at a junction 11 .
  • a displacement and a force produced from the actuator element 3 along the center axis 2 are transmitted to the rigid connecting portion 9 .
  • the transmitted displacement and force are further transmitted to the junctions 10 and 11 through the first upper lever arm 5 and the first lower lever arm 7 joined to the connecting portion 9 .
  • the displacement and force from the actuator element 3 are turned 90 degrees, and are directed in an upward direction 12 via the junction 10 between the first upper lever arm 5 and the second upper lever arm 6 , and the degree of displacement is increased.
  • the displacement and force are also turned 90 degrees, and are directed in a downward direction 13 via the junction 11 between the first lower lever arm 7 and the second lower lever arm 8 , and the degree of displacement is increased. That is, the junctions 10 and 11 function as displacing portions, and increase the displacement.
  • the connections between the fixed portion 4 , and the second upper lever arm 6 and the second lower lever arm 8 function as the fulcrums 15
  • the connecting portion 9 between the actuator element 3 , and the first upper lever arm 5 and the first lower lever arm 7 functions as the force point
  • the joint 10 between the first upper lever arm 5 and the second upper lever arm 6 functions as the action point.
  • the joint 11 between the first lower lever arm 7 and the second lower lever arm 8 similarly functions as the action point.
  • FIGS. 2A and 2B show the operating manner of only the upper part of the lever-arm displacement-increasing device 1 , and the lower part also operates in a similar manner.
  • the second lever arm 6 is connected to the fixed portion 4 to which the rear end of the actuator element 3 is fixed.
  • a displacement transmitted to the connecting portion (force point) 9 attempts to displace the junction 10 in the same direction as the direction of displacement of the actuator element 3 through the first upper lever arm 5 joined to the connecting portion 9 .
  • the junction 10 is also joined to the second upper lever arm 6 that is connected to the fixed portion 4 , the second upper lever arm 6 is displaced in the upward direction 12 so as to pull the junction (action point) 10 . That is, the connection between the second upper lever arm 6 and the fixed portion 4 functions as the fulcrum 15 .
  • the action point 10 shifts to a position 10 ′, and the first upper lever arm 5 and the second upper lever arm 6 shift to positions 5 ′ and 6 ′.
  • FIGS. 3A and 3B are a front view and a perspective view, respectively, of a lever-arm displacement-increasing device according to a second embodiment of the present invention.
  • a lever-arm displacement-increasing device 16 of the second embodiment is different from the above-described first embodiment shown in FIGS. 1A and 1B in having only one pair of lever arms, and the lever-arm displacement-increasing device 16 is used to produce output in one direction.
  • a displacement and a force produced from an actuator element 3 along a center axis 2 are transmitted to a connecting portion 9 made of a rigid material, and are then transmitted to a junction 10 through a first upper lever arm 5 joined to the connecting portion 9 .
  • the displacement and force of the actuator element 3 are turned 90 degrees through the junction 10 between the first upper lever arm 5 and a second upper lever arm 6 , and are directed in an upward direction 12 , and the degree of displacement is increased. That is, the junction 10 functions as a displacing portion, and increases the displacement.
  • a second upper lever arm 17 and a second lower lever arm 18 protrude from the side of a connecting portion 9 toward junctions 10 and 11 .
  • action points shift from the junctions 10 and 11 to displacing portions 19 and 20 at the front ends of the second upper lever arm 17 and the second lower lever arm 18 . Therefore, a small displacement can be converted into a large displacement.
  • displacing portions 19 and 20 are formed by protruding the second upper and lower lever arms 17 and 18 in the above third embodiment, they may be formed by protruding first upper and lower lever arms 5 and 7 .
  • first and second upper lever arms 5 and 17 parallel to each other with a gap smaller than the thickness of the lever arms therebetween, and to similarly arrange the first and second lower lever arms 7 and 18 . Further, the displacement can be further increased by increasing the lengths of the lever arms ( 5 , 7 , 17 , and 18 ), as shown in FIG. 4 .
  • the displacement increasing ratio can be further increased by stacking a plurality of units 1 , 1 ′, and 1 ′′ each including a first lever arm ( 5 or 7 ), a second lever arm ( 6 or 8 ), and a junction ( 10 or 11 ), as shown in FIG. 5 .
  • a DC voltage may be applied for static displacement, or an AC voltage may be applied for dynamic displacement.
  • the output displacing portion can produce a large displacement in a direction orthogonal to the displacing direction of the actuator element. Also, since the lever-arm displacement-increasing device has a single-piece structure, it can be easily produced, and the production cost can be reduced.
  • the displacement is not increased based on the lever principle, but is increased by the lengths of the lever arms, the position of the fulcrum can be freely determined, the degree of freedom in design is increased, and the range of applications can be widened.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Devices (AREA)
  • General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
US10/928,158 2003-09-05 2004-08-30 Lever-arm displacement-increasing device Abandoned US20050082916A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US11/514,342 US7405509B2 (en) 2003-09-05 2006-09-01 Lever-arm displacement-increasing device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2003-314702 2003-09-05
JP2003314702A JP4085936B2 (ja) 2003-09-05 2003-09-05 レバーアーム変位拡大装置

Related Child Applications (1)

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US11/514,342 Continuation US7405509B2 (en) 2003-09-05 2006-09-01 Lever-arm displacement-increasing device

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US20050082916A1 true US20050082916A1 (en) 2005-04-21

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US10/928,158 Abandoned US20050082916A1 (en) 2003-09-05 2004-08-30 Lever-arm displacement-increasing device
US11/514,342 Expired - Fee Related US7405509B2 (en) 2003-09-05 2006-09-01 Lever-arm displacement-increasing device

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US (2) US20050082916A1 (fr)
EP (1) EP1512888B1 (fr)
JP (1) JP4085936B2 (fr)
KR (1) KR101051547B1 (fr)
CN (1) CN100468942C (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150277103A1 (en) * 2014-04-01 2015-10-01 Luzhong Yin Microelectromechanical displacement structure and method for controlling displacement
CN110323966A (zh) * 2019-08-12 2019-10-11 潍坊聚德电子有限公司 一种压电位移放大机构
US10730740B2 (en) 2014-04-01 2020-08-04 Agiltron, Inc. Microelectromechanical displacement structure and method for controlling displacement

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JP5019615B2 (ja) * 2008-02-29 2012-09-05 Ｎｅｃトーキン株式会社 振動発生装置
DE102008017963B4 (de) * 2008-04-08 2016-10-06 Airbus Defence and Space GmbH Strömungssteuerungsbauelement
US8237334B2 (en) * 2009-04-22 2012-08-07 Parker-Hannifin Corporation Piezo actuator
WO2010151230A2 (fr) * 2009-06-26 2010-12-29 Vestas Wind Systems A/S Système actionneur, pale d'éolienne, et éolienne
WO2011029447A2 (fr) * 2009-09-09 2011-03-17 Vestas Wind Systems A/S Pale de rotor de turbine éolienne
JP2013090309A (ja) * 2011-10-24 2013-05-13 Kddi Corp 音響トランスデューサ、スピーカ、電子機器
WO2015100280A1 (fr) * 2013-12-24 2015-07-02 Viking At, Llc Actionneur en matériau intelligent amplifié mécaniquement utilisant un assemblage de toile en couches
EP3260837A1 (fr) * 2016-06-21 2017-12-27 Continental Automotive GmbH Appareil d'essais
CN111721247B (zh) * 2020-06-02 2021-06-04 南京泰普森自动化设备有限公司 测量装置及其位移传感器

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Publication number Priority date Publication date Assignee Title
US20150277103A1 (en) * 2014-04-01 2015-10-01 Luzhong Yin Microelectromechanical displacement structure and method for controlling displacement
US10730740B2 (en) 2014-04-01 2020-08-04 Agiltron, Inc. Microelectromechanical displacement structure and method for controlling displacement
US10752492B2 (en) 2014-04-01 2020-08-25 Agiltron, Inc. Microelectromechanical displacement structure and method for controlling displacement
CN110323966A (zh) * 2019-08-12 2019-10-11 潍坊聚德电子有限公司 一种压电位移放大机构

Also Published As

Publication number Publication date
EP1512888A2 (fr) 2005-03-09
KR101051547B1 (ko) 2011-07-22
US20070138913A1 (en) 2007-06-21
JP2005086881A (ja) 2005-03-31
EP1512888A3 (fr) 2009-12-02
CN100468942C (zh) 2009-03-11
JP4085936B2 (ja) 2008-05-14
EP1512888B1 (fr) 2011-08-17
KR20050024612A (ko) 2005-03-10
CN1592071A (zh) 2005-03-09
US7405509B2 (en) 2008-07-29

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