WO2010058985A2 - Élément piézoélectrique stratifié, dispositif d'excitation utilisant un élément piézoélectrique, et appareil photographique miniature utilisant l'élément piézoélectrique - Google Patents

Élément piézoélectrique stratifié, dispositif d'excitation utilisant un élément piézoélectrique, et appareil photographique miniature utilisant l'élément piézoélectrique Download PDF

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Publication number
WO2010058985A2
WO2010058985A2 PCT/KR2009/006838 KR2009006838W WO2010058985A2 WO 2010058985 A2 WO2010058985 A2 WO 2010058985A2 KR 2009006838 W KR2009006838 W KR 2009006838W WO 2010058985 A2 WO2010058985 A2 WO 2010058985A2
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WO
WIPO (PCT)
Prior art keywords
piezoelectric element
resonator
lens holder
terminal
coupled
Prior art date
Application number
PCT/KR2009/006838
Other languages
English (en)
Korean (ko)
Other versions
WO2010058985A3 (fr
Inventor
류재욱
정회원
서종식
김요섭
Original Assignee
(주)하이소닉
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
Priority claimed from KR1020080115264A external-priority patent/KR101005774B1/ko
Priority claimed from KR1020090043902A external-priority patent/KR101100140B1/ko
Priority claimed from KR1020090043905A external-priority patent/KR101046238B1/ko
Priority claimed from KR1020090060373A external-priority patent/KR101039684B1/ko
Priority claimed from KR1020090109457A external-priority patent/KR101104192B1/ko
Priority claimed from KR1020090109458A external-priority patent/KR101051074B1/ko
Application filed by (주)하이소닉 filed Critical (주)하이소닉
Publication of WO2010058985A2 publication Critical patent/WO2010058985A2/fr
Publication of WO2010058985A3 publication Critical patent/WO2010058985A3/fr

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    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
    • 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
    • H02N2/0005—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing non-specific motion; Details common to machines covered by H02N2/02 - H02N2/16
    • H02N2/001—Driving devices, e.g. vibrators
    • H02N2/0015—Driving devices, e.g. vibrators using only bending modes
    • 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
    • H02N2/026—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing linear motion, e.g. actuators; Linear positioners ; Linear motors by pressing one or more vibrators against the driven body
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/57—Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/20—Piezoelectric or electrostrictive devices with electrical input and mechanical output, e.g. functioning as actuators or vibrators
    • H10N30/204—Piezoelectric or electrostrictive devices with electrical input and mechanical output, e.g. functioning as actuators or vibrators using bending displacement, e.g. unimorph, bimorph or multimorph cantilever or membrane benders
    • H10N30/2041—Beam type
    • H10N30/2042—Cantilevers, i.e. having one fixed end
    • H10N30/2046—Cantilevers, i.e. having one fixed end adapted for multi-directional bending displacement

Definitions

  • the present invention relates to a small camera driving apparatus using a piezoelectric element, and more particularly, to a small camera driving apparatus using a piezoelectric element to transfer the lens by driving the lens holder in the vertical direction using the piezoelectric element.
  • an auto focusing camera device capable of adjusting a focus by driving a lens has become popular.
  • a VCM method is known in which a lens holder equipped with a lens is floated in a free vibration state through a suspension member, and the lens holder is driven using a driving force generated between the coil and the magnet as a power source.
  • the VCM method works well when the size of the lens holder is small or the weight is light, but when the size of the lens holder is large or the weight is heavy, there is a problem in that the operation force is weak and the operation is not good.
  • the lens holder is floated in a free vibration state through the suspension member, and thus, the suspension member is easily damaged when the mobile phone is subjected to the same shock as when falling.
  • the present invention provides a compact camera driving apparatus using a piezoelectric element that can be used for a camera equipped with a high pixel sensor because the lens holder works well, is more robust than the VCM method, and has a longer moving distance of the lens holder. There is this.
  • the compact camera driving apparatus using the piezoelectric element of the first invention includes a base; A lens holder disposed above the base and mounted with a lens and driven in an optical axis direction; A driving unit for driving the lens holder in the optical axis direction; A control part for controlling the driving part, wherein the driving part comprises: a resonator part having one end coupled to the base and the other end contacting an outer circumferential surface of the lens holder; A piezoelectric element mounted on the resonator unit, the piezoelectric element having a first (+) terminal and a second (+) terminal, wherein the control unit has a phase difference of 90 degrees between the first (+) terminal and the second (+) terminal.
  • the other end of the resonator is characterized in that to drive the lens holder in the optical axis direction while the elliptical displacement movement.
  • the frequency of the voltage applied to the piezoelectric element by the controller is a value between a first resonant frequency at which the other end of the resonator moves up and down and a second resonant frequency at which the other end of the resonator moves left and right.
  • the driving unit comprising: a resonator unit having one end rotatably coupled to the fixed shaft and the other end contacting an outer circumferential surface of the lens holder; A spring having one end coupled to the resonator unit and the other end coupled to the base to add an elastic force such that the other end of the resonator unit is pressed toward the outer circumferential surface of the lens holder; It includes the piezoelectric element mounted to the resonator.
  • the spring is made of a torsion spring, and the resonator comprises: a piezoelectric element coupling part on which the piezoelectric element is mounted; A rotary coupling portion formed at one end of the piezoelectric element coupling portion and surrounding the fixed shaft; One end of the piezoelectric element coupling portion is formed separated from the rotary coupling portion, and comprises a spring support portion is coupled to one end of the spring.
  • the resonator includes: a movable part formed at the other end of the piezoelectric element coupling part to contact an outer circumferential surface of the lens holder; A first connection part connecting an upper portion of the other end of the piezoelectric element coupling part to the movable part; And a second connection part connecting the lower part of the other end of the piezoelectric element coupling part to the movable part, wherein the first connection part and the second connection part are formed to be inclined toward the movable part, and the first connection part and the second connection part are connected to each other.
  • An elastic deformation hole is formed between the piezoelectric element coupling parts.
  • a small camera driving apparatus using the piezoelectric element of the second invention includes a base member; A lens holder disposed inside the base member and mounted with a lens and driven in an optical axis direction; A drive body for driving the lens holder in the optical axis direction; A control unit for controlling the drive unit, the drive unit comprising: a resonator unit having one end coupled to the base member and the other end contacting an outer circumferential surface of the lens holder; A piezoelectric element mounted on the resonator and having a first (+) terminal and a second (+) terminal, wherein the control unit has a 90 degree angle to the first (+) terminal and the second (+) terminal.
  • a voltage having a phase difference and having a frequency corresponding to the resonance frequency of the driving body is applied to the piezoelectric element, and the other end of the resonator is once in the vertical direction by the voltage of the first specific frequency applied to the piezoelectric element. Bent, and bent twice in left and right directions by a voltage of a second specific frequency applied to the piezoelectric element, wherein the control unit is configured to optimally specify the piezoelectric element between the first specific frequency and a second specific frequency.
  • a voltage having a frequency may be applied to drive the lens holder in the optical axis direction while the other end of the resonator moves in an elliptical trajectory.
  • the resonator unit includes a piezoelectric element coupling unit to which the piezoelectric element is mounted; A plurality of coupling protrusions protruding from one end of the piezoelectric element coupling portion to be spaced apart from each other; It is formed on the other end of the piezoelectric element coupling portion protruding to the movable portion for the elliptical displacement movement by the piezoelectric element, the base member is formed with a fixed shaft in parallel with the moving direction of the lens holder, a plurality of the coupling projection The fixed shaft is inserted therebetween to couple one end of the resonator to the fixed shaft, but the separation distance of the end of the coupling protrusion is smaller than the diameter of the fixed shaft.
  • the first (+) terminal and the second (+) terminal are mounted in parallel with each other in the longitudinal direction of the resonator, and the width of the movable portion is smaller than the width of the piezoelectric element coupling portion.
  • the movable portion is formed with a hole-shaped adjustment hole for adjusting the displacement movement trajectory of the movable portion.
  • the base member has a side portion parallel to the moving direction of the lens holder, a movement guide member for smoothly moving the lens holder is disposed between the side portion of the base member and the lens holder, the movement
  • the guide member includes a retainer disposed between the side portion and the lens holder;
  • the ball member is rotatably inserted into the retainer and is in contact with the side portion and the lens holder.
  • One of the base member or the lens holder is formed with a guide protrusion in the moving direction of the lens holder, and the other is formed with a guide groove into which the guide protrusion is inserted, thereby preventing the left and right flow of the lens holder.
  • a second driving body using the piezoelectric element of the present invention includes a resonator having a flat plate shape; A piezoelectric element coupled to the resonator to move the resonator, wherein the resonator comprises: a piezoelectric element coupling part on which the piezoelectric element is mounted; One end is connected to the piezoelectric element coupling portion and the other end is made of a movable portion for the elliptical displacement movement by the piezoelectric element, the piezoelectric element comprises a first (+) terminal and a second (+) terminal A first (+) terminal and a second (+) terminal are mounted in parallel with each other along the longitudinal direction of the resonator, and the first (+) terminal and the second (+) terminal have a voltage having a phase difference of 90 degrees.
  • the piezoelectric element is stretched in the longitudinal direction of the resonator to drive the resonator, and the width of the movable part is smaller than the width of the piezoelectric element
  • the movable portion is provided with a hole-shaped adjustment hole for adjusting the displacement movement trajectory of the movable portion.
  • the adjusting hole is made of a closed curve shape, is formed in the center of the width of the movable portion.
  • a friction member is mounted at the other end of the movable part, one end of which is connected to the piezoelectric element coupling part, and one end of the movable part is formed with an extension portion that is wider and connected to the piezoelectric element coupling part.
  • the adjustment hole is formed in an open curve shape symmetrically on both sides of the movable portion in the width direction.
  • a friction member is mounted at the other end of the movable part, and one end is connected to the piezoelectric element coupling part, and the adjustment hole is formed at one end of the movable part.
  • the multilayered piezoelectric element module of the third invention includes a first piezoelectric element layer having a first (+) terminal portion and a second (+) terminal portion spaced apart from each other on an upper surface thereof; A second piezoelectric element layer disposed below the first piezoelectric element layer and having a (-) terminal portion mounted on an upper surface thereof; A third piezoelectric element layer is disposed below the second piezoelectric element layer, and the first (+) terminal portion and the second (+) terminal portion, which are spaced apart from each other, are mounted, and the third piezoelectric element layer is mounted on the lower surface thereof.
  • the (-) terminal portion of the second piezoelectric element layer is in contact with the lower portion of the first piezoelectric element layer
  • the first (+) terminal portion and the second (+) terminal portion of the third piezoelectric element layer is the second piezoelectric It is characterized in that it is in contact with the lower portion of the device layer.
  • the first piezoelectric element layer on which the first (+) terminal portion and the second (+) terminal portion are mounted on the upper surface, and the second piezoelectric element layer on which the (-) terminal portion is mounted on the upper surface are sequentially and repeatedly stacked.
  • the third piezoelectric element having a first (+) terminal portion and a second (+) terminal portion spaced apart from each other on an upper surface thereof is mounted on a lower portion of the second piezoelectric element layer positioned at a lowermost portion, and a negative terminal portion is mounted on a lower surface thereof.
  • the element layer is in contact.
  • the plurality of first (+) terminal portions are electrically interconnected by a first connecting portion
  • the plurality of second (+) terminal portions are electrically interconnected by a second connecting portion
  • the plurality of (-) terminal portions The first connection part and the second connection part and the third connection part are electrically connected to each other by a third connection part.
  • the piezoelectric element module has a six-sided shape, wherein the first connection portion is mounted on one side of the piezoelectric element module to interconnect side surfaces of the plurality of first (+) terminal portions, and the second connection portion is a piezoelectric element module. It is mounted on the other side of the first connector and the side of the plurality of second (+) terminal portion interconnected, the third connector is mounted on the other side and the other side of the first connector and the second connector ) Connect the sides of the terminal to each other.
  • a compact camera driving apparatus using another multilayer piezoelectric element module of the third invention includes a base member; A lens holder disposed inside the base member and mounted with a lens and driven in an optical axis direction; A drive body for driving the lens holder in the optical axis direction; A control unit for controlling the drive unit, the drive unit comprising: a resonator unit having one end coupled to the base member and the other end contacting an outer circumferential surface of the lens holder; And a piezoelectric element module mounted on the resonator and having a first (+) terminal portion, a second (+) terminal portion, and a (-) terminal portion, wherein the control unit includes the first (+) terminal portion and the second (+) terminal portion.
  • a voltage having a phase difference of 90 degrees with respect to a terminal portion and having a frequency corresponding to the resonance frequency of the driving body is applied to the piezoelectric element module, wherein the piezoelectric element module includes a first (+) terminal portion and a first spaced apart from each other on an upper surface thereof.
  • the (-) terminal portion of the second piezoelectric element layer is in contact with the lower portion of the first piezoelectric element layer, and the first (+) terminal portion and the second (+) terminal portion of the third piezoelectric element layer are the second piezoelectric element. It is characterized in that it is in contact with the lower portion of the device layer.
  • the other end of the resonator is bent one time in the vertical direction by the voltage of the first specific frequency applied to the piezoelectric element module and twice in the left and right direction by the voltage of the second specific frequency applied to the piezoelectric element module.
  • the lens is flexibly moved, and the control unit applies a voltage having an optimum specific frequency between the first specific frequency and the second specific frequency to the piezoelectric element module, so that the other end of the resonator moves in an elliptic locus.
  • the holder is driven in the optical axis direction.
  • the drive body using the piezoelectric element comprises: a plate-shaped resonator; A first piezoelectric element and a second piezoelectric element coupled to the resonator to move the resonator; One is coupled to one surface of the first piezoelectric element between the first piezoelectric element and the resonator, and the other is coupled to the first (+) electrode and the first (GND) electrode coupled to the other surface of the first piezoelectric element. ; One is coupled to one surface of the second piezoelectric element between the second piezoelectric element and the resonator, and the other is coupled to the other surface of the second piezoelectric element and the second (GND) electrode.
  • the first piezoelectric element coupling portion is mounted to the first piezoelectric element;
  • One end is connected to the first piezoelectric element coupling portion, the other end is connected to the second piezoelectric element coupling portion, and a central portion is formed of a movable part that performs an elliptical displacement movement by the first piezoelectric element and the second piezoelectric element.
  • the first (+) electrode and the second (+) electrode are characterized in that the alternating voltage of the appropriate frequency having a mutual phase difference is applied to drive the resonator.
  • the first piezoelectric element coupling part and the second piezoelectric element coupling part are stretched by the first piezoelectric element and the second piezoelectric element with a phase difference in the longitudinal direction of the resonator part when an alternating voltage of an appropriate frequency is applied, and the movable part of the resonator part is extended. Make an elliptical displacement movement.
  • the first piezoelectric element coupling portion and the second piezoelectric element coupling portion are disposed in parallel to each other.
  • the center portion of the movable part is formed to protrude in the opposite direction of the first piezoelectric element and the second piezoelectric element, and is equipped with a friction member.
  • the appropriate frequency of the alternating voltage applied to the first (+) electrode and the second (+) electrode is a first resonant frequency in which the movable part reciprocates in the longitudinal direction of the resonator, and the movable part is in the longitudinal direction of the resonator. It is a value between the second resonant frequencies that bend in the vertical direction.
  • the first resonant frequency is a frequency such that the stretching motion of the first piezoelectric element coupling part and the second piezoelectric element coupling part is the same, and the second resonant frequency is the first piezoelectric element coupling part and the second piezoelectric element coupling. This is the frequency that the negative stretching movements take place alternately.
  • the range of the second resonant frequency is a value between a first resonance frequency and a first antiresonance frequency.
  • a fourth small camera driving apparatus using the piezoelectric element of the present invention comprises: a base member; A lens holder disposed inside the base member and mounted with a lens and driven in an optical axis direction; A drive body for driving the lens holder in the optical axis direction; And a control unit for controlling the driving body, wherein the driving body comprises: a resonator part having one end slidably contacted with the base member and the other end contacting an outer circumferential surface of the lens holder; A first piezoelectric element and a second piezoelectric element coupled to the resonator to move the resonator; One is coupled to one surface of the first piezoelectric element between the first piezoelectric element and the resonator, and the other is coupled to the first (+) electrode and the first (GND) electrode coupled to the other surface of the first piezoelectric element.
  • the controller is configured to apply an alternating voltage having a phase difference between the first (+) electrode and the second (+) electrode and having a frequency corresponding to the resonance frequency of the driving body. And reciprocating longitudinally by alternating voltages of the first resonant frequency applied to the first piezoelectric element and the second piezoelectric element, and alternating voltages of the second resonant frequency applied to the first piezoelectric element and the second piezoelectric element.
  • Reciprocally bent in a vertical direction in the longitudinal direction by the control unit by applying an alternating voltage having an appropriate frequency between the first resonant frequency and the second resonant frequency to the first piezoelectric element and the second piezoelectric element ,
  • the other end of the resonator unit It is characterized in that to drive the lens holder in the optical axis direction while performing an elliptical trajectory motion.
  • the resonator unit includes: a first piezoelectric element coupling unit on which the first piezoelectric element is mounted; A second piezoelectric element coupling part on which the second piezoelectric element is mounted; One end is connected to the first piezoelectric element coupling portion, the other end is connected to the second piezoelectric element coupling portion, and a central portion is formed of a movable part that performs an elliptical displacement movement by the first piezoelectric element and the second piezoelectric element.
  • the central portion of the movable part protrudes in a direction opposite to the first piezoelectric element and the second piezoelectric element, and is provided with a friction member, and the lens holder is equipped with a friction part in contact with the friction member.
  • the first piezoelectric element coupling part and the second piezoelectric element coupling part are stretched by the first piezoelectric element and the second piezoelectric element with a phase difference in the longitudinal direction of the resonator part, and the movable part of the resonator part has an elliptical displacement. Try to exercise.
  • the base member is formed with a side portion parallel to the moving direction of the lens holder, and the cover member is mounted on the side portion of the base member is covered, the sliding portion is formed in the side portion of the base member is the driving body is seated
  • the driving body is disposed in the sliding groove, and the other end of the resonator part is stretched in the longitudinal direction, and the driving body is disposed between the side portion of the base member and the cover member.
  • It further comprises a pressing member in contact with one end of the resonator unit and pushes the resonator in the direction of the friction portion, wherein the elastic means by applying an elastic force to the pressing member to push the one end of the resonator in the other end direction
  • the friction member mounted on the other end of the resonator unit is in close contact with the frictional part.
  • a circuit board for supplying power to the first piezoelectric element and the second piezoelectric element, wherein the first (GND) electrode is coupled to one surface of the first piezoelectric element between the first piezoelectric element and the resonance part.
  • the first (+) electrode is coupled to the other surface of the first piezoelectric element
  • the second (GND) electrode is coupled to one surface of the second piezoelectric element between the second piezoelectric element and the resonator.
  • a 2 (+) electrode is coupled to the other surface of the second piezoelectric element, and the circuit board includes: both terminal portions connected to the first (+) electrode and the second (+) electrode; And a negative terminal portion connected to the first (GND) electrode and the second (GND) electrode, wherein the negative terminal portion is disposed between one end of the resonator and the pressing member to be connected to the first (GND) electrode. It is connected to the electrode and the second (GND) electrode.
  • the first piezoelectric element coupling portion and the second piezoelectric element coupling portion are disposed in parallel to each other.
  • the first resonant frequency is a frequency such that the stretching motion of the first piezoelectric element coupling part and the second piezoelectric element coupling part is the same, and the second resonant frequency is the first piezoelectric element coupling part and the second piezoelectric element coupling. This is the frequency that the negative stretching movements take place alternately.
  • the base member has a side portion parallel to the moving direction of the lens holder, and a movement guide member for smoothly moving the lens holder is disposed between the side portion of the base member and the lens holder, the movement
  • the guide member includes a retainer disposed between the side portion and the lens holder;
  • the ball member is rotatably inserted into the retainer and is in contact with the side portion and the lens holder.
  • One of the inner circumferential surface of the base member or the outer circumferential surface of the lens holder is formed with a guide protrusion in the moving direction of the lens holder, the other is formed with a guide groove into which the guide protrusion is inserted, the left and right flow of the lens holder To prevent.
  • the small camera driving apparatus using the piezoelectric element of the present invention as described above, even if the weight of the lens holder is heavy, it works well, is more robust than the VCM method, and the moving distance of the lens holder is long in the camera equipped with a high pixel sensor Can be used.
  • a stronger elliptic motion may be generated in the movable part, so that the movement of the lens holder can be made more quickly.
  • FIG. 1 is a one-way perspective view of a compact camera driving apparatus according to a first embodiment of the present invention
  • FIG. 2 is a perspective view from another direction of the compact camera driving apparatus according to the first embodiment
  • FIG. 3 is an exploded perspective view in one direction of the compact camera driving apparatus according to the first embodiment
  • FIG. 4 is an exploded perspective view in another direction of the compact camera driving apparatus according to the first embodiment
  • FIG. 5 is a state diagram showing a state in which the other end of the resonator vibrates in the up and down direction according to the first embodiment
  • FIG. 6 is a state diagram illustrating a state in which the other end of the resonator vibrates in left and right directions according to the first embodiment
  • FIG. 7 is a process diagram of a state in which the other end of the resonator according to the first embodiment performs an elliptic motion
  • FIG. 8 is a perspective view of a compact camera driving apparatus according to a second embodiment
  • FIG. 9 is a plan view of a compact camera driving apparatus according to a second embodiment.
  • FIG. 10 is an exploded perspective view of a compact camera driving apparatus according to a second embodiment
  • FIG. 11 is a perspective view of a driving body according to the second embodiment
  • FIG. 12 is a state diagram showing a state in which the other end of the resonator vibrates in the up and down direction according to the second embodiment
  • FIG. 13 is a state diagram showing a state in which the other end of the resonator according to the second embodiment vibrates in left and right directions
  • FIG. 14 is a process diagram of a state in which the other end of the resonator according to the second embodiment performs an elliptic trajectory motion
  • FIG. 15 is a plan view of a drive body having various structures according to a second embodiment
  • FIG. 16 is a perspective view and a cross-sectional view of a piezoelectric element module according to a third embodiment of the present invention.
  • 17 is a state diagram showing a state in which the other end of the resonator vibrates in the up and down direction according to the third embodiment
  • FIG. 18 is a perspective view of a compact camera driving apparatus according to a fourth embodiment of the present invention.
  • FIG. 19 is an exploded perspective view of a state in which the cover member is separated from the compact camera driving apparatus according to the fourth embodiment
  • FIG. 20 is a front view in the state of FIG. 19;
  • FIG. 21 is a plan view in the state of FIG. 19;
  • FIG. 22 is an exploded perspective view of a cover member and a lens holder separated in the compact camera driving apparatus according to the fourth embodiment
  • FIG. 23 is a perspective view of the base member and the driving body in FIG. 22;
  • FIG. 24 is an exploded perspective view showing a part of the configuration shown in FIG. 23;
  • FIG. 25 is an exploded perspective view illustrating the entire configuration of FIG. 23;
  • FIG. 26 is a state diagram showing a state of motion according to a first resonance frequency of a driving body according to the fourth embodiment
  • FIG. 27 is a state diagram showing a motion state according to a second resonant frequency of the driving body according to the fourth embodiment
  • FIG. 28 is a state diagram showing an elliptic motion state of a movable part according to an appropriate frequency of a driving body according to the fourth embodiment.
  • FIG. 1 is a one-way perspective view of a compact camera driving apparatus according to a first embodiment of the present invention
  • FIG. 2 is another perspective view of the compact camera driving apparatus according to a first embodiment
  • FIG. 3 is a small size according to the first embodiment
  • 4 is an exploded perspective view of the camera driving apparatus in one direction
  • FIG. 4 is an exploded perspective view of the small camera driving apparatus according to the first embodiment
  • FIG. 5 illustrates a state in which the other end of the resonator unit vibrates in the vertical direction
  • 6 is a state diagram illustrating a state in which the other end of the resonator vibrates in left and right directions
  • FIG. 7 is a process diagram in which the other end of the resonator according to the first embodiment performs an elliptic motion. to be.
  • the compact camera driving apparatus of the present invention includes a base 10, a lens holder 20, a driving unit, a control unit, and the like.
  • the lens holder 20 is disposed above the base 10, and an image sensor (not shown) is disposed below.
  • a fixed shaft 12 protrudes from the base 10 in parallel with the moving direction of the lens holder 20.
  • the bearing ball 16 is mounted to the guide portion 14 to facilitate the movement of the lens holder 20 is formed protruding.
  • the guide portion 14 is formed with a first guide rail groove 15 in which a plurality of bearing balls 16 can slide in the vertical direction.
  • the lens holder 20 has a lens embedded therein and is driven in the optical axis direction.
  • the second guide rail groove 25 in which the bearing ball 16 is seated is formed in the vertical direction on the outer circumferential surface of the lens holder 20, and the lens holder 20 is the bearing ball 16. It is connected to the guide portion 14 through.
  • the lens holder 20 when the lens holder 20 is moved in the vertical direction, the lens holder 20 by the bearing ball 16 disposed between the first guide rail groove 15 and the second guide rail groove 25. ) Can be moved in the vertical direction more smoothly.
  • a friction part 27 is formed on the outer circumferential surface of the lens holder 20 to contact the driving part.
  • the driving unit serves to drive the lens holder 20 by pushing or pulling in the optical axis direction.
  • the drive unit includes a resonator unit 30, a piezoelectric element 40, and a spring 50.
  • One end of the resonator 30 is rotatably coupled to the fixed shaft 12 in detail, and the other end of the resonator 30 contacts the friction part 27 in detail on the outer circumferential surface of the lens holder 20. .
  • the resonator part 30 includes a piezoelectric element coupling part 31, a rotation coupling part 32, a spring support part 33, a movable part 34, a first connection part 35, and a second connection part. 36, elastic deformation holes 37, and the like.
  • the piezoelectric element coupling portion 31 has a flat plate shape, and the piezoelectric element 40 is mounted on one surface thereof.
  • the rotary coupling part 32 and the spring support part 33 are separated from one end of the piezoelectric element coupling part 31 in the vertical direction.
  • the rotary coupling portion 32 is formed to surround the fixed shaft 12 on one end of the piezoelectric element coupling portion 31, to couple the resonator portion 30 to the fixed shaft 12, When the resonator unit 30 rotates, the resonator unit 30 forms the center of rotation of the resonator unit 30 together with the fixed shaft 12.
  • the spring support part 33 is formed to be separated from the rotary coupling part 32 at one lower end of the piezoelectric element coupling part 31, and one end of the spring 50 is coupled thereto.
  • the movable part 34 is formed at the other end of the piezoelectric element coupling part 31 to contact the friction part 27 in detail on the outer circumferential surface of the lens holder 20.
  • the width of the movable part 34 is smaller than the width of the piezoelectric element coupling part 31.
  • the width of the movable part 34 is reduced, so that a force is concentrated on the movable part 34 so that the displacement motion is more. This is to make it work well.
  • the first connecting portion 35 connects the upper portion of the other end of the piezoelectric element coupling portion 31 and the movable portion 34, and the second connecting portion 36 is connected to the lower end of the other end of the piezoelectric element coupling portion 31.
  • the movable part 34 is connected.
  • the first connecting portion 35 and the second connecting portion 36 are formed to be inclined toward the movable portion 34, respectively.
  • the elastic deformation hole 37 is formed between the first connection part 35, the second connection part 36, and the piezoelectric element coupling part 31.
  • first connection part 35 and the second connection part 36 are formed to be inclined toward the movable part 34, and the elastic deformation hole 37 is formed in a substantially triangular or trapezoidal shape.
  • the first connecting portion 35 and the second connecting portion 36 may flow better when the resonator portion 30 flows by the elastic deformation hole 37, so that the first connecting portion 35 ) And the movable part 34 connected to the second connection part 36 can be better flow.
  • the piezoelectric element 40 is deformed by applying a voltage, and serves to cause the resonator unit 30 to be initially vibrated, and thus the resonator unit 30 is mounted on the piezoelectric element coupling unit 31 in detail. And a first (+) terminal 41 and a second (+) terminal 42.
  • first (+) terminal 41 and the second (+) terminal 42 are disposed on one surface of the piezoelectric element 40, and the first (+) terminal 41 and the first surface on the other surface thereof.
  • One (-) terminal 43 in contact with the 2 (+) terminal 42 is disposed.
  • one piezoelectric element 40 having two (+) terminals and one (-) terminal 43 is used.
  • one (+) terminal and one each is used.
  • Two piezoelectric elements 40 having four (-) terminals 43 may be used.
  • the spring 50 has one end coupled to the resonator 30 in detail, the spring support 33, and the other end coupled to the base 10, and the other end of the resonator 30 is the lens holder ( An elastic force is added to press in the direction of the outer circumferential surface of 20).
  • the spring 50 is preferably made of a torsion spring.
  • the spring 50 is mounted in an expanded state to apply a force to the spring support 33.
  • the control unit controls the driving unit, and in detail, controls the voltage applied to the piezoelectric element 40 so that the driving unit is driven to move the lens holder 20.
  • the control unit applies a voltage having a phase difference of 90 degrees to the first (+) terminal 41 and the second (+) terminal 42 and having a frequency corresponding to the resonance frequency of the driving unit, thereby resonating the resonance.
  • the movable part 34 located at the other end of the part 30 drives the lens holder 20 in the optical axis direction while performing an elliptical displacement motion.
  • the frequency of the voltage applied to the piezoelectric element 40 by the control unit is between the first resonant frequency of the other end of the resonator 30 moving up and down, and the second resonant frequency of the other end of the resonator moving left and right Value.
  • the other end of the resonator 30 combines the vertical motion and the left and right motion to perform an elliptic motion. .
  • the controller applies a voltage having a phase difference of 90 degrees to the first (+) terminal 41 and the second (+) terminal 42 of the piezoelectric element 40.
  • the phases of the voltages applied to the first (+) terminal 41 and the second (+) terminal 42 have a difference of 90 degrees.
  • the frequency of the applied voltage is a frequency corresponding to the resonance frequency of the drive unit.
  • the piezoelectric element 40 When a voltage having a phase difference of 90 degrees is applied to the first (+) terminal 41 and the second (+) terminal 42 of the piezoelectric element 40, the piezoelectric element 40 is contracted and expanded. Thus, the resonator 30 to which the piezoelectric element 40 is coupled also flows.
  • the resonator unit 30 may be largely flowed in detail by the driving unit with a small force.
  • the other end of the resonator unit 30 moves in the vertical direction by the first resonant frequency.
  • the other end of the resonator unit 30 moves in the left and right directions by the second resonant frequency.
  • the control unit uses the piezoelectric element.
  • the other end of the resonator 30 is combined with the vibration mode in the vertical direction and the vibration mode in the left and right directions to perform an elliptic motion.
  • the movable part 34 is elliptical.
  • the flow amount of the first connection portion 35 and the second connection portion 36 can be increased.
  • the movable part 34 connected to the first connection part 35 and the second connection part 36 may be made to flow larger.
  • the movable part 34 pushes the lens holder 20 upward or downward to move the lens holder 20 in the optical axis direction.
  • the resonator part 30 rotates about the fixed shaft 12 and the rotary coupling part 32.
  • the spring 50 is connected to the spring support 33 formed at one end of the resonator 30 so as to push the spring support 33, the other end of the resonator 30 by the lever principle
  • the movable portion 34 formed in the may be in close contact with the lens holder 20.
  • the movable part 34 is always in contact with the outer circumferential surface of the lens holder 20 to move the lens holder 20 in the vertical direction.
  • the spring 50 is mounted in a compressed or inflated state, and the movable part 34 formed at the other end of the other end of the resonator 30 by adding an elastic force to the spring support 33 is the lens holder ( 20) to be strongly pressed toward the outer circumferential surface thereof.
  • FIG. 8 is a perspective view of the small camera driving apparatus according to the second embodiment
  • FIG. 9 is a plan view of the small camera driving apparatus according to the second embodiment
  • FIG. 10 is an exploded perspective view of the small camera driving apparatus according to the second embodiment
  • 11 is a perspective view of a driving body according to the second embodiment
  • FIG. 12 is a state diagram showing a state in which the other end of the resonator vibrates in the up and down direction according to the second embodiment
  • FIG. FIG. 14 is a view illustrating a state in which the other end of the resonator vibrates in left and right directions
  • FIG. 14 is a process diagram of a state in which the other end of the resonator vibrates in an elliptic shape
  • FIG. 15 is a second embodiment of the present invention.
  • the compact camera driving apparatus includes a base member 110, a lens holder 120, a driving body 130, a leaf spring 140, and a movement guide member 150. ), A flexible circuit board 145, and a controller.
  • the lens holder 120 is disposed inside the base member 110, and an image sensor (not shown) is disposed below.
  • the base member 110 is formed with a side portion 111 and a fixed shaft 112 parallel to the moving direction of the lens holder 120.
  • the lens holder 120 includes a lens (not shown) therein and is driven by moving in the optical axis direction, that is, in the vertical direction.
  • a friction part 121 for contacting the driving body 130 is formed in the vertical direction.
  • the movement guide member 150 is disposed between the side portion 111 of the base member 110 and the lens holder 120 so that the vertical movement of the lens holder 120 can be performed smoothly.
  • the movement guide member 150 includes a retainer 151 disposed between the side portion 111 and the lens holder 120, and a ball member 152 rotatably inserted into the retainer 151.
  • the retainer 151 may not be in contact with the side portion 111 and the lens holder 120, and the ball member 152 may be in contact with the side portion 111 and the lens holder 120.
  • the diameter of the ball member 152 is larger than the thickness of the retainer 151.
  • the side groove 111 and the lens holder 120 has a rail groove (113, 23) for the ball member 152 is seated to move is formed long in the vertical direction.
  • the retainer 151 moves only about half of the moving distance of the lens holder 120.
  • either one of the base member 110 or the lens holder 120 is formed with a guide protrusion 114 in the moving direction of the lens holder 120, the other one is the guide protrusion 114 is inserted Guide grooves 122 are formed, the lens holder 120 is rotated in the left and right directions to prevent flow.
  • the guide protrusions 114 are formed in the base member 110 in the vertical direction, and the guide grooves 122 are formed in the lens holder 120 in the vertical direction.
  • the driver 130 drives the lens holder 120 by pushing or pulling in the optical axis direction, that is, the vertical direction.
  • the driver 130 includes a resonator 131 and a piezoelectric element 139.
  • One end of the resonator 131 is coupled to the base member 110, in detail, the fixed shaft 112, and the other end of the resonator 131 contacts the outer surface of the lens holder 120 in detail with the friction part 121. .
  • the resonator 131 includes a piezoelectric element coupling part 132, a movable part 133, a coupling protrusion 134, and a friction member 135.
  • the piezoelectric element coupling portion 132 has a flat plate shape, and the piezoelectric element 139 is mounted on one surface thereof.
  • the movable part 133 is formed to protrude from the other end of the piezoelectric element coupling part 132 to perform an elliptical displacement movement by the piezoelectric element 139.
  • One end of the movable part 133 is connected to the piezoelectric element coupling part 132, the other end of which is located at the free end, and the other end of the movable member 133 is coupled to the friction member 135.
  • the width of the movable portion 133 is smaller than the width of the piezoelectric element coupling portion 132.
  • the movable portion 133 is formed with a hole-shaped adjustment hole 137 for adjusting the displacement movement trajectory of the movable portion 133.
  • the adjusting hole 137 may be formed at various positions in the movable part 133, which will be described in detail later.
  • the coupling protrusion 134 has a plurality of protrusions formed at one end of the piezoelectric element coupling part 132 to be spaced apart from each other, and serves to couple the resonator 131 to the fixed shaft 112. .
  • a distance between the ends of the coupling protrusion 134 is smaller than a diameter of the fixed shaft 112.
  • the ends of the coupling protrusion 134 extend in a direction away from each other while contacting the fixed shaft 112 and then contract again.
  • One end of the resonator 131 is coupled to the fixed shaft 112 while surrounding the shaft 112.
  • the friction member 135 is coupled to the other end of the movable part 133 and in contact with the frictional part 121 mounted to the lens holder 120 during the movement of the movable part 133 to the lens holder 120. Transfer the force to move up and down.
  • the piezoelectric element 139 is mounted on the resonator 131 in detail, the piezoelectric element coupling part 132, and deforms by applying a current from the flexible circuit board 145 to operate the resonator 131. It plays a role, and comprises a first (+) terminal 139a and a second (+) terminal 139b.
  • the first (+) terminal 139a and the second (+) terminal 139b are disposed on one surface, and one (-) terminal 139c is disposed on the other surface.
  • the first (+) terminal 139a and the second (+) terminal 139b are mounted in parallel with each other along the longitudinal direction of the resonator 131.
  • the piezoelectric element 139 is applied with a voltage having a phase difference of 90 degrees to the first (+) terminal 139a and the second (+) terminal 139b so that the piezoelectric element 139 is connected to the resonator unit. It is stretched in the longitudinal direction of 131 to drive the resonator 131.
  • one piezoelectric element 139 having two (+) terminals and one (-) terminal 139c is used.
  • each of the one (+) terminal Two piezoelectric elements 139 having one (-) terminal 139c may be used.
  • the leaf spring 140 presses the driving body 130 in the direction of the outer circumferential surface of the lens holder 120.
  • the leaf spring 140 is coupled to the side portion 111 of the base member 110 in a hook manner while surrounding the outside of the drive body 130.
  • the flexible circuit board 145 is disposed between the driving body 130 and the leaf spring 140 to supply current to the piezoelectric element 139.
  • One surface of the flexible circuit board 145 is in contact with the piezoelectric element 139, and the other surface of the flexible circuit board 145 is in contact with the plate spring 140.
  • a sponge 146 is coupled to the flexible circuit board 145 in the direction of the leaf spring 140 such that the leaf spring 140 and the flexible circuit board 145 are always in contact with each other.
  • the leaf spring 140, the flexible circuit board 145, and the driving body 130 may be always in contact with each other, so that the pressing force of the leaf spring 140 is always transmitted to the driving body 130. Can be.
  • the controller controls the driving body 130, and in detail, controls the voltage applied to the piezoelectric element 139 so that the driving body 130 is driven to move the lens holder 120. It plays a role.
  • the control unit has a voltage having a phase difference of 90 degrees to each of the first (+) terminal 139a and the second (+) terminal 139b and having a frequency corresponding to the resonance frequency of the driver 130. It is applied to the piezoelectric element 139 so that the movable part 133 located at the other end of the resonator 131 drives the lens holder 120 in the optical axis direction while performing an elliptical displacement motion.
  • FIG. 12 illustrates the movement of the movable portion 133 as viewed in the Y-axis direction shown in FIG. 10
  • FIG. 13 illustrates the movement of the movable portion 133 as viewed in the Z-axis direction shown in FIG. 10.
  • FIG. 10 illustrates the movement of the movable part 133 as viewed in the X-axis direction shown in FIG. 10.
  • the movable part 133 has a bent shape only once in one of the up and down directions by a voltage of a first specific frequency applied to the piezoelectric element 139, and as time passes, It vibrates repeatedly in the vertical direction.
  • the movable part 133 has a curved shape once in each of the left and right directions by a voltage of the second specific frequency applied to the piezoelectric element 139 and over time. It vibrates repeatedly from side to side.
  • the first specific frequency is curved in an arc shape
  • the second specific frequency is curved in a wavy sinusoidal shape.
  • the controller is configured to apply a voltage of an optimum specific frequency between the first specific frequency and the second specific frequency to the piezoelectric element 139 so that the movable part 133 moves in an elliptic shape as shown in FIG. 14. Do it.
  • the optimum specific frequency is a frequency having a value 1/2 of the sum of the first specific frequency and the second specific frequency, and the difference between the first specific frequency and the second specific frequency is preferably 3 kHz or less.
  • the adjusting hole 137 is formed in a closed curve shape, that is, inside the movable part 133, the adjusting hole 137 is formed of the movable part 133. It should be formed in the center of the width.
  • the movable part 133 when the adjusting hole 137 is formed in the shape of an open curve contacting the piezoelectric element coupling part 132 at one end of the movable part 133, the movable part 133 is formed.
  • the movable part 133 may be bent better when the displacement motion is performed in the width direction.
  • the adjusting hole 137 is formed in a closed curve shape, so that the adjusting hole 137 is formed. If you exercise vertically or horizontally, you can exercise in a balanced manner without eccentricity.
  • the piezoelectric element 139 is formed.
  • the force generated in the may be better transmitted to the movable portion 133 through the expansion portion 138.
  • the adjustment hole 137 is formed to be symmetrically formed at both sides of the width direction of the movable part 133 in the shape of an open curve between one end and the other end of the movable part 133. It may be.
  • the adjusting hole 137 may be formed between one end and the other end of the movable part 133 and at one end of the movable part 133.
  • the size of the control hole 137 is to be formed smaller than the size of the control hole 137 shown in Figure 15 (a) and 10 (d).
  • the adjustment hole 137 may not be formed in the movable part 133.
  • the first specific frequency and the second specific frequency are adjacent to each other, as shown in FIG. 15 (f).
  • the distance between the first specific frequency and the second specific frequency is farther than that of the adjusting hole 137.
  • the control unit applies a voltage having a phase difference of 90 degrees to the first (+) terminal 139a and the second (+) terminal 139b of the piezoelectric element 139.
  • phase of the voltage applied to the first (+) terminal 139a and the second (+) terminal 139b has a difference of 90 degrees.
  • the frequency of the applied voltage is a frequency corresponding to the resonance frequency of the driver 130.
  • the piezoelectric element 139 contracts and expands.
  • the resonator 131 to which the piezoelectric element 139 is coupled also flows.
  • the resonating unit 131 may be largely flowed in detail with the driving force with a small force.
  • the movable part 133 formed at the other end of the resonator 131 by the first specific frequency moves upward and downward.
  • the movable part 133 vibrates repeatedly in the vertical direction as time passes while having a curved form only once in one of the vertical directions.
  • the movable part 133 is moved in the left and right directions by the second specific frequency.
  • the movable part 133 vibrates repeatedly in the left and right direction as time passes, while having a curved form once each in both the left and right directions (up and down directions in FIG. 8) of the lens holder 120.
  • the movable part 133 has an elliptic motion by combining the first bent vibration mode in the up and down directions and the two bent vibration modes in the left and right directions.
  • the friction member 135 to which the other end of the movable part 133 is coupled is elliptical.
  • the difference between the first specific frequency and the second specific frequency is large, the difference between the optimum specific frequency, the first specific frequency, and the second specific frequency is turned on to provide a voltage having the optimum specific frequency to the movable unit 133. Even if it is applied, the movable part 133 does not perform an elliptic motion.
  • the movable part 133 is vibrated to be bent once in the vertical direction and the movable part 133 is vibrated to be bent twice in the left and right directions.
  • the second specific frequency to be changed so as to have a value adjacent to each other.
  • the friction member 135 coupled to the movable part 133 comes into contact with the frictional part 121 mounted to the lens holder 120 and the lens.
  • the holder 120 is pushed upward or downward, so that the lens holder 120 moves in the optical axis direction.
  • the movable part 133 having the friction member 135 is provided with the frictional part 121. It may be in close contact with the lens holder 120.
  • the movable part 133 is always in contact with the outer circumferential surface of the lens holder 120 to move the lens holder 120 in the vertical direction.
  • FIG. 16 is a perspective view and a cross-sectional view of a piezoelectric element module according to a third embodiment of the present invention
  • FIG. 17 is a state diagram illustrating a state in which the other end of the resonator unit vibrates in the vertical direction.
  • the compact camera driving apparatus includes a base member 210, a lens holder 220, a driving body 230, a leaf spring 240, and a movement guide member 250. ), A flexible circuit board 245, and a control unit.
  • the lens holder 220 is disposed inside the base member 210, and an image sensor (not shown) is disposed below.
  • the base member 210 has a side portion 211 and a fixed shaft 212 parallel to the moving direction of the lens holder 220 is formed.
  • the lens holder 220 includes a lens (not shown) therein and is driven by moving in the optical axis direction, that is, in the vertical direction.
  • a friction part 221 for contacting the driving body 230 is formed in the vertical direction.
  • the movement guide member 250 is disposed between the side portion 211 of the base member 210 and the lens holder 220 in order to smoothly move the lens holder 220 up and down. .
  • the movement guide member 250 includes a retainer 251 disposed between the side portion 211 and the lens holder 220, and a ball member 252 rotatably inserted into the retainer 251.
  • the retainer 251 is not in contact with the side portion 211 and the lens holder 220, and the ball member 252 is in contact with the side portion 211 and the lens holder 220.
  • the diameter of the ball member 252 is larger than the thickness of the retainer 251.
  • the side grooves 211 and the lens holder 220 is formed with the rail grooves 213 and 23 for the ball member 252 is moved in the vertical direction.
  • the retainer 251 moves only about half of the moving distance of the lens holder 220.
  • either one of the base member 210 or the lens holder 220 has a guide protrusion 214 formed in the moving direction of the lens holder 220, and the guide protrusion 214 is inserted into the other one.
  • Guide grooves 222 are formed, the lens holder 220 is rotated in the horizontal direction to prevent the flow.
  • the guide protrusion 214 is formed in the base member 210 in the vertical direction
  • the guide groove 222 is formed in the lens holder 220 in the vertical direction.
  • the driving member 230 serves to push or pull the lens holder 220 in the optical axis direction, that is, in the vertical direction.
  • the driver 230 includes a resonator 231 and a piezoelectric element module 239.
  • One end of the resonator 231 is coupled to the base member 210, in detail, the fixed shaft 212, and the other end of the resonator 231 contacts the frictional part 221 in detail on the outer circumferential surface of the lens holder 220. .
  • the resonator 231 includes a piezoelectric element coupling part 232, a movable part 233, a coupling protrusion 234, and a friction member 235.
  • the piezoelectric element coupling portion 232 has a flat plate shape, and the piezoelectric element module 239 is mounted on one surface thereof.
  • the movable portion 233 is formed to protrude from the other end of the piezoelectric element coupling portion 232, and performs the elliptical displacement movement by the piezoelectric element module 239.
  • One end of the movable portion 233 is connected to the piezoelectric element coupling portion 232, the other end of the movable portion 233 is free, and the other end of the movable member 233 is coupled to the friction member 235.
  • the width of the movable portion 233 is smaller than the width of the piezoelectric element coupling portion 232.
  • the movable portion 233 is formed with a hole-shaped adjustment hole 237 for adjusting the displacement movement trajectory of the movable portion 233.
  • the adjustment hole 237 may be formed at various positions in the movable part 233, which will be described later.
  • the coupling protrusion 234 is formed of a plurality of protruding to be spaced apart from each other at one end of the piezoelectric element coupling portion 232, and serves to couple the resonator 231 to the fixed shaft (212). .
  • the separation distance of the end of the coupling protrusion 234 is smaller than the diameter of the fixed shaft 212.
  • the ends of the coupling protrusion 234 extend in a direction away from each other while contacting the fixed shaft 212, and then contract again.
  • One end of the resonator 231 is coupled to the fixed shaft 212 while surrounding the shaft 212.
  • the friction member 235 is coupled to the other end of the movable part 233 and in contact with the frictional part 221 mounted to the lens holder 220 during the movement of the movable part 233 to the lens holder 220. Transfer the force to move up and down.
  • the piezoelectric element module 239 is mounted on the resonator 231 in detail, and the piezoelectric element coupling part 232 operates to deform by applying a current from the flexible circuit board 245 to operate the resonator 231. It plays a role.
  • the piezoelectric element module 239 is illustrated in FIG. 16.
  • FIG. 16 (a) is a perspective view of the piezoelectric element module 239
  • FIG. 16 (b) is a sectional view taken along line AA of FIG. 16 (a)
  • FIG. 16 (c) is a line BB of FIG. 16 (a). This is a cross-sectional view taken from.
  • the piezoelectric element module 239 includes a first piezoelectric element layer 239d, a second piezoelectric element layer 239e, and a third piezoelectric element layer 239f.
  • the first piezoelectric element layer 239d has a first (+) terminal portion 239a and a second (+) terminal portion 239b spaced apart from each other on an upper surface thereof.
  • the second piezoelectric element layer 239e is disposed below the first piezoelectric element layer 239d, and one ( ⁇ ) terminal portion 239c is mounted on an upper surface thereof.
  • the third piezoelectric element layer 239f is disposed under the second piezoelectric element layer 239e, and the first (+) terminal portion 239a and the second (+) terminal portion 239b spaced apart from each other on an upper surface thereof. It is attached and one (-) terminal part 239c is attached to the lower surface.
  • the (-) terminal portion 239c of the second piezoelectric element layer 239e is in contact with the lower portion of the first piezoelectric element layer 239d and the first (+) terminal portion of the third piezoelectric element layer 239f. 239a and the second (+) terminal portion 239b are in contact with the lower portion of the second piezoelectric element layer 239e.
  • the (-) terminal portion 239c is composed of one on the same plane, and the first (+) terminal portion 239a and the second (+) terminal portion 239b are spaced apart from each other on the same plane.
  • the first piezoelectric device layer 239d, the second piezoelectric device layer 239e, and the third piezoelectric device layer 239f form one basic set.
  • the piezoelectric element module 230 may be sequentially stacked with the first piezoelectric element layer 239d and the second piezoelectric element layer 239e.
  • first piezoelectric element layer 239d on which the first (+) terminal portion 239a and the second (+) terminal portion 239b are mounted, and the (-) terminal portion 239c are mounted on the upper surface.
  • the first and second piezoelectric element layers 239e are sequentially and repeatedly stacked, and a first (+) terminal portion 239a spaced apart from each other on an upper surface of the lower portion of the second piezoelectric element layer 239e positioned at the lowest level.
  • a second (+) terminal portion 239b is mounted, and a lower surface of the third piezoelectric element layer 239f is provided with a negative terminal portion 239c mounted thereon.
  • one first piezoelectric element layer 239d, a second piezoelectric element layer 239e, and a third piezoelectric element layer 239f may be sequentially stacked to form a basic multilayer piezoelectric element module 239.
  • the first and second piezoelectric element layers 239d and 239e are repeatedly stacked, and the third piezoelectric element module 239 is deformed by mounting the third piezoelectric element layer 239f at the bottom thereof. May be formed.
  • the plurality of first (+) terminal portions 239a are electrically connected to each other by a first connecting portion 239g, and the plurality of second (+) terminal portions 239b are electrically connected by a second connecting portion 239h.
  • the first connection part 239g and the second connection part 239h are not in contact with each other.
  • the plurality of negative terminal parts 239c are electrically connected to each other by the third connection part 239i.
  • the first (+) terminal portion 239a and the second (+) terminal portion 239b are mounted in parallel to each other along the longitudinal direction of the resonator 231.
  • the piezoelectric element module 239 is formed in a hexahedral shape as a whole, and the first connection portion 239g is mounted on one side of the piezoelectric element module 239 to the side surfaces of the plurality of first (+) terminal portions 239a.
  • the second connection part 239h is mounted on the other side of the first connection part 239g of the piezoelectric element module 239 to interconnect the side surfaces of the plurality of second (+) terminal parts 239b.
  • the third connector 239i is mounted on the other side of the first connector 239g and the second connector 239h to interconnect side surfaces of the plurality of (-) terminals 239c.
  • the first piezoelectric element layer 239d is provided with a voltage having a phase difference of 90 degrees to the first (+) terminal portion 239a and the second (+) terminal portion 239b to the piezoelectric element module 239.
  • the second piezoelectric element layer 239e and the third piezoelectric element layer 239f are stretched in the longitudinal direction of the resonator 231 to drive the resonator 231.
  • the leaf spring 240 serves to press the driving body 230 in the direction of the outer circumferential surface of the lens holder 220.
  • the leaf spring 240 is coupled to the side portion 211 of the base member 210 in a hook manner while surrounding the outside of the drive body 230.
  • the flexible circuit board 245 is disposed between the driver 230 and the leaf spring 240 to supply current to the piezoelectric element module 239.
  • One surface of the flexible circuit board 245 is in contact with the piezoelectric element module 239, and the other surface of the flexible circuit board 245 is in contact with the plate spring 240.
  • the flexible circuit board 245 is coupled to the sponge 246 in the direction of the leaf spring 240 so that the leaf spring 240 and the flexible circuit board 245 are always in contact with each other.
  • the leaf spring 240, the flexible circuit board 245, and the driving body 230 may be always in contact with each other, so that the pressing force of the leaf spring 240 is always transmitted to the driving body 230. Can be.
  • the controller controls the driving body 230, and in detail, controls the voltage applied to the piezoelectric element module 239 to drive the driving body 230 to move the lens holder 220. Play a role.
  • the control unit has a voltage having a phase difference of 90 degrees to each of the first (+) terminal unit 239a and the second (+) terminal unit 239b and having a frequency corresponding to the resonance frequency of the driver 230. It is applied to the piezoelectric element module 239 so that the movable part 233 located at the other end of the resonator 231 drives the lens holder 220 in the optical axis direction while performing an elliptical displacement movement.
  • the movable part 233 has a bent shape only once in one of the up and down directions by the voltage of the first specific frequency applied to the piezoelectric element module 239 and over time. It vibrates repeatedly in the vertical direction.
  • the movable part 233 vibrates repeatedly from side to side as time passes, having a curved form once in each of the left and right directions by the voltage of the second specific frequency applied to the piezoelectric element module 239. do.
  • the first specific frequency is curved in an arc shape
  • the second specific frequency is curved in a wavy sinusoidal shape.
  • the control unit applies the voltage of the optimum specific frequency between the first specific frequency and the second specific frequency to the piezoelectric element module 239 to allow the movable unit 233 to perform an elliptic locus motion.
  • the optimum specific frequency is a frequency having a value 1/2 of the sum of the first specific frequency and the second specific frequency, and the difference between the first specific frequency and the second specific frequency is preferably 3 kHz or less.
  • the piezoelectric element module 239 As described above, by applying a voltage having a phase difference of 90 degrees to the piezoelectric element module 239 and having the optimum specific frequency, the vertical movement (2 degrees 7) and the movement by the first specific frequency to the movable part 233, The left and right motions by the second specific frequency are combined to perform an elliptic motion.
  • FIG. 18 is a perspective view of a compact camera driving apparatus according to a fourth embodiment
  • FIG. 19 is an exploded perspective view of a cover member separated from the compact camera driving apparatus according to a fourth embodiment
  • FIG. 20 is a state of FIG. 19.
  • 21 is a plan view in a state of FIG. 19
  • FIG. 22 is an exploded perspective view of a cover member and a lens holder separated in the compact camera driving apparatus according to the fourth embodiment
  • FIG. 24 is an exploded perspective view in which a part of the configuration in FIG. 23 is disassembled
  • FIG. 25 is an exploded perspective view in which the entire configuration is exploded in FIG. 23, and
  • FIG. 26 is a drive in accordance with a fourth embodiment.
  • FIG. 27 is a state diagram showing the motion state according to the first resonance frequency of Fig. 27 is a state diagram showing the motion state according to the second resonance frequency of the driving body according to the fourth embodiment, and Fig. 28 is a According to the proper frequency of the driving body It is a state diagram showing the state of the elliptic movement in the east.
  • the compact camera driving apparatus using the driving body of the present invention includes a base member 310, a lens holder 320, a cover member 330, and a driving body 340. , The elastic means 360, the pressing member 365, the circuit board 370, the control unit and the like.
  • the lens holder 320 is disposed inside the base member 310, and an image sensor (not shown) is disposed below.
  • the base member 310 has a side portion 311 parallel to the moving direction of the lens holder 320 is formed.
  • the lens holder 320 includes a lens (not shown) therein and is driven by moving in the optical axis direction, that is, in the vertical direction.
  • a friction part 321 for contacting the driving body 340 is formed long in the vertical direction.
  • the movement guide member 315 is disposed between the side portion 311 of the base member 310 and the lens holder 320 so that vertical movement of the lens holder 320 can be made smoothly.
  • the movement guide member 315 includes a retainer 316 disposed between the side portion 311 and the lens holder 320, and a ball member 317 rotatably inserted into the retainer 316.
  • the retainer 316 is not in contact with the side portion 311 and the lens holder 320, and the ball member 317 is in contact with the side portion 311 and the lens holder 320.
  • the diameter of the ball member 317 is greater than the thickness of the retainer 316.
  • the side groove portion 311 and the lens holder 320 has a rail groove (313, 23) for the ball member 317 is seated to move is formed long in the vertical direction.
  • the retainer 316 moves only about half of the moving distance of the lens holder 320.
  • either one of the base member 310 or the lens holder 320 has a guide protrusion 324 formed in the moving direction of the lens holder 320, and the guide protrusion 324 is inserted into the other one.
  • a guide groove 314 is formed to prevent the lens holder 320 from flowing by rotating in the left and right directions.
  • the guide protrusion 324 is formed on the outer circumferential surface of the lens holder 320 in the vertical direction, and the guide groove 314 is formed on the base member 310 in the vertical direction.
  • the cover member 330 is mounted to the base member 310 to cover the side portion 311 and the upper portion of the base member 310.
  • the driving member 340 of the present invention serves to push or pull the lens holder 320 in the optical axis direction, that is, in the vertical direction.
  • the driving body 340 includes a resonator 341, a first piezoelectric element 346, and a second piezoelectric element 347.
  • the resonator part 341 is made of phosphor bronze, one end of which is slidably disposed in contact with the base member 310, and the other end of the resonator part 311 contacts the to-be-friction part 321 in detail. have.
  • the resonator part 341 includes a first piezoelectric element coupling part 342, a second piezoelectric element coupling part 343, a movable part 344, and a friction member 345.
  • the first piezoelectric element coupling portion 342 and the second piezoelectric element coupling portion 343 each have a flat plate shape, one surface of which is in contact with the base member 310, and the other of the first piezoelectric element 346 is formed on the other surface thereof. And a second piezoelectric element 347 is mounted.
  • the first piezoelectric element coupling portion 342 and the second piezoelectric element coupling portion 343 are disposed in parallel to each other.
  • One end of the movable portion 344 is connected to the first piezoelectric element coupling portion 342, and the other end thereof is connected to the second piezoelectric element coupling portion 343.
  • the second piezoelectric element 347 is formed to protrude in the opposite direction.
  • the friction member 345 in contact with the frictional portion 321 is mounted on the protruding center portion of the movable portion 344.
  • the friction member 345 mounted on the central portion of the movable part 344 performs an elliptical displacement movement by the first piezoelectric element 346 and the second piezoelectric element 347.
  • the friction member 345 is coupled to the protruding center portion of the movable part 344 to contact the target friction part 321 mounted to the lens holder 320 during the movement of the movable part 344. It transmits the force to move 320 up and down.
  • the first piezoelectric element 346 and the second piezoelectric element 347 are respectively mounted on the resonator 341 in detail in the first piezoelectric element coupling part 342 and the second piezoelectric element coupling part 343, respectively.
  • a current is applied from the circuit board 370 and is deformed to operate the resonator 341.
  • a first (+) electrode is coupled to one surface of the first piezoelectric element 346, which is between the first piezoelectric element 346 and the resonance unit 341, and the first surface of the first piezoelectric element 346 is coupled to the first surface.
  • (GND) electrodes are coupled.
  • a second (+) electrode is coupled to one surface of the second piezoelectric element 347 between the second piezoelectric element 347 and the resonator 341, and the other surface of the second piezoelectric element 347. It is coupled to the second (GND) electrode.
  • the first (+) electrode, the first (GND) electrode, the second (+) electrode, and the second (GND) electrode may be formed on one surface and the other surface of the first piezoelectric element 346 and the second piezoelectric element 347. Since it is thinly attached, it is not separately shown in the drawing.
  • the first (3GND) electrode and the second (3GND) electrode are coupled to one surface of the first piezoelectric element 346 and one surface of the second piezoelectric element 347, respectively, and the first piezoelectric element
  • the first (+) electrode and the second (+) electrode may be coupled to the other surface of 346 and the other surface of the second piezoelectric element 347, respectively.
  • the first (+) electrode, the first (3GND) electrode, the second (+) electrode, and the second (3GND) electrode are mounted in parallel with each other along the longitudinal direction of the resonator 341.
  • the first piezoelectric element 346 and the second piezoelectric element 347 are applied with alternating voltages (three alternating voltages) of appropriate frequencies having a phase difference between the first (+) electrode and the second (+) electrode.
  • the first piezoelectric element 346 and the second piezoelectric element 347 are stretched in the longitudinal direction of the resonator 341 to drive the resonator 341.
  • the first piezoelectric element 346 and the second piezoelectric element 347 are stretched and contracted, the first piezoelectric element coupling portion 342 and the second piezoelectric element coupling portion 343 together of the resonator 341.
  • the movable portion 344 of the resonator portion 341 is an elliptical displacement movement.
  • the alternating voltages applied to the first (+) electrode and the second (+) electrode may preferably have a phase difference of 90 degrees.
  • the elastic means 360 and / or the pressing member 365 may have one end of the resonance portion 341 in detail, one end of the first piezoelectric element coupling portion 342 and one end of the second piezoelectric element coupling portion 343. Is pushed toward the frictional portion 321 so that the friction member 345 mounted at the other end of the resonance portion 341 is in contact with the frictional portion 321.
  • the pressing member 365 is composed of a ' ⁇ ' shaped support portion 366, and the pressing portion 367 formed on both sides of the support portion 366.
  • the pressing unit 367 may include one end of the resonator unit 341, that is, one end of the first piezoelectric element coupling unit 342 and one end of the second piezoelectric element coupling unit 343, respectively. Push in the other end.
  • the lengths of the first piezoelectric element coupling part 342 and the second piezoelectric element coupling part 343 may be measured. It is formed longer than the length of the first piezoelectric element 346 and the second piezoelectric element 347, and bent one end of the first piezoelectric element coupling portion 342 and one end of the second piezoelectric element coupling portion 343, respectively. As a result, one end of the first piezoelectric element coupling portion 342 and one end of the second piezoelectric element coupling portion 343, which are bent by the pressing portion 367, may be pushed in the other end direction.
  • the friction member 345 mounted on the movable part 344 formed at the other end of the resonance part 341 may be in strong contact with the frictional part 321 at all times.
  • the support 366 is slidably mounted to the base member 310 in the direction of the frictional portion 321.
  • the elastic means 360 is made of a coil spring, and adds an elastic force so that the pressing member 365 moves in the direction of the frictional portion 321.
  • the support protrusion 318 is formed on the base member 310, and the elastic means 360 is disposed between the support protrusion 318 and the support portion 366, thereby supporting the support portion 366. An elastic force to move in the direction of the friction part 321 was added.
  • the resonator 341 when the resonator 341 is expanded and contracted, the resonator 341 may extend and contract in a state in which the resonator 341 is slidably disposed without being separated from the base member 310.
  • the friction member 345 coupled to the other end is driven.
  • An elastic force is always applied to the friction member 345 coupled to the other end of the resonator 341 by the elastic means 360 as described above, so as to move in the direction of the friction part 321, and thus the friction member 345. And the frictional part 321 may be maintained in a contact state at all times.
  • one end of the elastic means 360 is coupled to the base member 310 and the other end is coupled to the resonator 341, the resonator by the elastic force of the elastic means (360) A force to move in the direction of the friction part 321 may be applied to the 341.
  • the circuit board 370 serves to supply power to the first piezoelectric element 346 and the second piezoelectric element 347.
  • the circuit board 370 includes a positive electrode portion 371 and a negative electrode portion 372.
  • the positive electrode portion 371 is coupled to the other surface of the first piezoelectric element 346 and the other surface of the second piezoelectric element 347, respectively, to expose the first (+) electrode and the second (+) electrode to the outside. Is connected to.
  • the negative electrode part 372 is disposed between one end of the resonator part 341 and the pressing part 367 of the pressing member 365 so that the first (GND) electrode is formed by the resonator part 341. And a second (GND) electrode.
  • the pressing unit 367 pushes one ends of the negative electrode unit 372 and the resonator unit 341 toward the frictional unit 310, respectively, so that the negative electrode unit 372 moves the resonator unit 341.
  • Two positive electrode portions 371 and two negative electrode portions 372 are formed.
  • the side surface 311 of the base member 310 is formed with a sliding groove 312 on which the driving body 340 is seated, and the driving body 340 is disposed in the sliding groove 312. .
  • the overall size can be reduced.
  • the driving body 340 inserted into the sliding groove 312 is disposed between the side portion 311 of the base member 310 and the cover member 330 so as not to be separated to the outside.
  • the pressing member 365, the elastic means 360 and the circuit board 370 is also disposed between the side portion 311 of the base member 310 and the cover member 330.
  • the controller controls the driver 340, and in detail, the driver 340 is driven by controlling an alternating voltage applied to the first piezoelectric element 346 and the second piezoelectric element 347. It serves to move the lens holder 320 in the vertical direction.
  • the resonator is configured to apply an alternating voltage having a phase difference of 90 degrees to the first (+) electrode and the second (+) electrode and having a frequency corresponding to an appropriate frequency of the driver 340, respectively.
  • the movable part 344 located at the other end of the 341 drives the lens holder 320 in the optical axis direction while performing an elliptical displacement motion.
  • 26 to 28 illustrate the motion of the movable part 344 by the driving body 340, and show the motion of the resonator part 341.
  • the other end of the resonator 341, that is, the movable part 344, is connected to the alternating voltage of the first resonant frequency applied to the first piezoelectric element 346 and the second piezoelectric element 347, as shown in FIG. To reciprocate in the longitudinal direction.
  • the movable part 344 is bent in the vertical direction in the longitudinal direction by the alternating voltage of the second resonant frequency applied to the first piezoelectric element 346 and the second piezoelectric element 347 as shown in FIG. Do a vertical reciprocating movement.
  • the first piezoelectric element coupling part 342 and the second piezoelectric element coupling part 343 have the same stretching motion by the first resonant frequency.
  • first piezoelectric element coupling portion 342 and the second piezoelectric element coupling portion 343 have the same phase difference and extend and contract in the same manner.
  • the first piezoelectric element coupling part 342 and the second piezoelectric element coupling part 343 are stretched and contracted alternately by the second resonant frequency.
  • the second piezoelectric element Coupling portion 343 is to be contracted movement.
  • the controller applies an alternating voltage having an appropriate frequency between the first resonance frequency and the second resonance frequency to the first piezoelectric element 346 and the second piezoelectric element 347, as shown in FIG. 28.
  • the movable part 344 located at the other end of the resonator 341 drives the lens holder 320 in the optical axis direction while performing an elliptical trajectory movement.
  • the appropriate frequency is a frequency having a value of 1/2 of the sum of the first resonant frequency and the second resonant frequency, and the range of the second resonant frequency is a first resonance frequency and a first antiresonance. It is preferable that the value is between the antiresonance frequency.
  • the length of the movable part 344 by the first resonance frequency is applied.
  • the directional motion (3 degrees 11) and the vertical motion (3 degrees 12) by the second resonant frequency are combined to perform an elliptic movement (3 degrees 13).
  • the controller applies an alternating voltage having a phase difference of 90 degrees to the first (+) electrode and the second (+) electrode respectively connected to the first piezoelectric element 346 and the second piezoelectric element 347.
  • phase of the alternating voltage applied to the first (+) electrode and the second (+) electrode has a difference of 90 degrees.
  • the frequency of the alternating voltage applied is an appropriate frequency corresponding to the middle of the first resonant frequency and the second resonant frequency of the driving body 340.
  • the first piezoelectric element 346 and the second piezoelectric element 347 each extend and contract.
  • the first piezoelectric element coupling portion 342 and the second piezoelectric element coupling portion 343, to which the first piezoelectric element 346 and the second piezoelectric element 347 are coupled may eventually flow to form the resonance unit ( 341) flows.
  • the frequency of the alternating voltage applied is an appropriate frequency positioned between the first resonant frequency and the second resonant frequency of the driving body 340, the driving unit 340 in detail with the small force, and the resonator unit 341. ) Can be greatly flown.
  • the movable part 344 formed at the other end of the resonator part 341 by the first resonant frequency is reciprocated in the longitudinal direction.
  • the movable part 344 reciprocates in the vertical direction by the second resonant frequency.
  • the controller controls the third resonance frequency.
  • a proper frequency of 365 kHz which is an average value of the sum of the first resonance frequency and the second resonance frequency, is applied to the first piezoelectric element 346 and the second piezoelectric element 347.
  • the movable part 344 has the vibration mode in the longitudinal direction and the vibration mode in the up and down direction to perform an elliptic motion.
  • the difference between the first resonant frequency and the second resonant frequency is large, the difference between the proper frequency and the first resonant frequency and the second resonant frequency is turned on to apply an alternating voltage having an appropriate frequency to the movable unit 344. Even if the movable portion 344 may not be an elliptic movement.
  • the friction member 345 coupled to the movable part 344 contacts the frictional part 321 mounted to the lens holder 320 while the lens is in contact with the lens.
  • the holder 320 is pushed upward or downward, so that the lens holder 320 moves in the optical axis direction.
  • the elastic member 360 adds an elastic force to the other end of the resonator 341 in the direction of the frictional part 321, the friction member 345 mounted to the movable part 344 is provided. It may be in close contact with the friction portion 321 mounted on the lens holder 320.
  • the movable part 344 always contacts the outer circumferential surface of the lens holder 320 so that the lens holder 320 can be strongly moved in the vertical direction.
  • the present invention is applied to a small camera device used in an electronic device such as a mobile phone, it works well even if the weight of the lens holder is heavy, more robust than the VCM method, and excellent operation even in a camera equipped with a high pixel sensor.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lens Barrels (AREA)
  • Telephone Set Structure (AREA)
  • General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)

Abstract

La présente invention concerne un élément piézoélectrique utilisé comme source d'excitation pour exciter un porte-objectif dans un appareil photographique miniature installé dans un appareil électronique tel qu'un téléphone mobile. L'objet de l'invention, qui fonctionne correctement même si le porte-objectif est lourd, est plus robuste que la technologie VCM et peut être utilisé dans un appareil photographique équipé d'un capteur à haute résolution dans lequel le porte-objectif doit accomplir une longue course.
PCT/KR2009/006838 2008-11-19 2009-11-19 Élément piézoélectrique stratifié, dispositif d'excitation utilisant un élément piézoélectrique, et appareil photographique miniature utilisant l'élément piézoélectrique WO2010058985A2 (fr)

Applications Claiming Priority (12)

Application Number Priority Date Filing Date Title
KR1020080115264A KR101005774B1 (ko) 2008-11-19 2008-11-19 압전소자를 이용한 소형카메라 구동장치
KR10-2008-0115264 2008-11-19
KR10-2009-0043905 2009-05-20
KR10-2009-0043902 2009-05-20
KR1020090043902A KR101100140B1 (ko) 2009-05-20 2009-05-20 압전소자를 이용한 소형카메라 구동장치
KR1020090043905A KR101046238B1 (ko) 2009-05-20 2009-05-20 압전소자가 장착된 구동체
KR10-2009-0060373 2009-07-02
KR1020090060373A KR101039684B1 (ko) 2009-07-02 2009-07-02 다층 압전소자모듈 및 이를 이용한 소형카메라 구동장치
KR10-2009-0109458 2009-11-13
KR10-2009-0109457 2009-11-13
KR1020090109457A KR101104192B1 (ko) 2009-11-13 2009-11-13 압전소자가 장착된 구동체
KR1020090109458A KR101051074B1 (ko) 2009-11-13 2009-11-13 압전소자를 이용한 소형카메라 구동장치

Publications (2)

Publication Number Publication Date
WO2010058985A2 true WO2010058985A2 (fr) 2010-05-27
WO2010058985A3 WO2010058985A3 (fr) 2010-09-23

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PCT/KR2009/006838 WO2010058985A2 (fr) 2008-11-19 2009-11-19 Élément piézoélectrique stratifié, dispositif d'excitation utilisant un élément piézoélectrique, et appareil photographique miniature utilisant l'élément piézoélectrique

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101222783B1 (ko) * 2010-09-28 2013-01-15 삼성전기주식회사 디지털 카메라모듈
CN114244183A (zh) * 2021-12-25 2022-03-25 西安交通大学 可双向驱动的x型结构共振式压电作动器及其作动方法
EP3972230A4 (fr) * 2019-06-06 2022-10-19 Huawei Technologies Co., Ltd. Module de caméra, caméra vidéo et terminal mobile

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100318861B1 (ko) * 1998-09-10 2002-03-25 김춘호 평판형선형초음파모터
KR20070050492A (ko) * 2004-09-29 2007-05-15 교세라 가부시키가이샤 카메라 모듈 및 이 카메라 모듈을 이용한 휴대 단말기

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100318861B1 (ko) * 1998-09-10 2002-03-25 김춘호 평판형선형초음파모터
KR20070050492A (ko) * 2004-09-29 2007-05-15 교세라 가부시키가이샤 카메라 모듈 및 이 카메라 모듈을 이용한 휴대 단말기

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101222783B1 (ko) * 2010-09-28 2013-01-15 삼성전기주식회사 디지털 카메라모듈
EP3972230A4 (fr) * 2019-06-06 2022-10-19 Huawei Technologies Co., Ltd. Module de caméra, caméra vidéo et terminal mobile
CN114244183A (zh) * 2021-12-25 2022-03-25 西安交通大学 可双向驱动的x型结构共振式压电作动器及其作动方法
CN114244183B (zh) * 2021-12-25 2023-08-15 西安交通大学 可双向驱动的x型结构共振式压电作动器及其作动方法

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