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WO2009113163A1 - Moving apparatus - Google Patents

Moving apparatus Download PDF

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Publication number
WO2009113163A1
WO2009113163A1 PCT/JP2008/054475 JP2008054475W WO2009113163A1 WO 2009113163 A1 WO2009113163 A1 WO 2009113163A1 JP 2008054475 W JP2008054475 W JP 2008054475W WO 2009113163 A1 WO2009113163 A1 WO 2009113163A1
Authority
WO
WIPO (PCT)
Prior art keywords
guide shaft
driving
output means
ultrasonic motor
output
Prior art date
Application number
PCT/JP2008/054475
Other languages
French (fr)
Japanese (ja)
Inventor
公一 八重口
Original Assignee
パイオニア株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by パイオニア株式会社 filed Critical パイオニア株式会社
Priority to PCT/JP2008/054475 priority Critical patent/WO2009113163A1/en
Publication of WO2009113163A1 publication Critical patent/WO2009113163A1/en

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B21/00—Head arrangements not specific to the method of recording or reproducing
    • G11B21/02—Driving or moving of heads
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/4806—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed specially adapted for disk drive assemblies, e.g. assembly prior to operation, hard or flexible disk drives
    • G11B5/4873—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed specially adapted for disk drive assemblies, e.g. assembly prior to operation, hard or flexible disk drives the arm comprising piezoelectric or other actuators for adjustment of the arm
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
    • G11B7/0857—Arrangements for mechanically moving the whole head
    • G11B7/08582—Sled-type positioners
    • 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
    • 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
    • H10N30/202—Piezoelectric or electrostrictive devices with electrical input and mechanical output, e.g. functioning as actuators or vibrators using longitudinal or thickness displacement combined with bending, shear or torsion displacement
    • H10N30/2023—Piezoelectric or electrostrictive devices with electrical input and mechanical output, e.g. functioning as actuators or vibrators using longitudinal or thickness displacement combined with bending, shear or torsion displacement having polygonal or rectangular shape
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/54—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head into or out of its operative position or across tracks
    • G11B5/55—Track change, selection or acquisition by displacement of the head
    • G11B5/5521—Track change, selection or acquisition by displacement of the head across disk tracks
    • G11B5/5552—Track change, selection or acquisition by displacement of the head across disk tracks using fine positioning means for track acquisition separate from the coarse (e.g. track changing) positioning means
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0925—Electromechanical actuators for lens positioning
    • G11B7/0937—Piezoelectric actuators

Definitions

  • the present invention relates to a technical field of a drive device using an ultrasonic motor that drives, for example, an optical pickup or other drive object along the extension direction of a guide shaft.
  • Patent Documents 1 to 5 propose driving apparatuses using ultrasonic motors.
  • Patent Document 1 to Patent Document 5 described above may cause the following problems.
  • Patent Documents 1 to 4 adopt a substrate fixing structure in which the ultrasonic motor is not fixed to the moving object but is fixed to the substrate side provided with the guide shaft.
  • the relative positional relationship with the sonic motor changes. For this reason, the deflection of the guide shaft increases as the moving object moves away from the ultrasonic motor, and the pressing pressure (that is, the driving force) by the ultrasonic motor changes due to the influence. Therefore, there is a possibility that stable driving cannot be maintained.
  • the ultrasonic motor employs a moving object fixing structure in which the ultrasonic motor is fixed to the moving object, the relative relationship between the moving object (in this case, the optical pickup 5) and the ultrasonic motor is described. The relative position does not change.
  • the ultrasonic motor since the ultrasonic motor is built in the moving object, it is easy to receive vibrations from the ultrasonic motor, and the moving object is prevented from being thinned.
  • an ultrasonic motor requires a biasing mechanism for biasing the guide shaft so as to transmit a driving force to the guide shaft.
  • the space occupied by the biasing mechanism is small in size of the moving object. Obstructing the reduction in thickness and thickness.
  • the present invention has been made in view of, for example, the above-described problems, and is a driving device that reduces noise and can maintain stable driving when an object to be driven is driven. It is an object of the present invention to provide a drive device that can suitably suppress vibration transmitted from a moving object to a moving object and that can reduce the thickness of the moving object.
  • the drive device is a drive device that drives a drive object in a predetermined direction, and is a guide that is fixed to a substrate and extends in the predetermined direction.
  • An output means for outputting a driving force in the direction along the direction of extension of the shaft and the guide shaft from the output end to the guide shaft and translating to the drive target by being coupled to the drive target
  • the output object is coupled to the output means so that the output force is output to the guide shaft from a position facing the drive object across the guide shaft.
  • Coupling means for outputting a driving force in the direction along the direction of extension of the shaft and the guide shaft from the output end to the guide shaft and translating to the drive target by being coupled to the drive target
  • Coupling means for outputting a driving force in the direction along the direction of extension of the shaft and the guide shaft from the output end to the guide shaft and translating to the drive target by being coupled to the drive target
  • Coupling means for outputting a driving force in the direction along the direction of extension of the shaft and the guide shaft from the output
  • the drive object can be suitably driven in a predetermined direction by the following operation.
  • the guide shaft is fixed to the substrate at both ends, at one end, or at other points, and extends in a predetermined direction to support the movement or sliding of the driven object.
  • the “predetermined direction” is a direction predetermined as a direction in which the driven object is desired to be driven, or a direction that can be appropriately changed when used, and includes not only a linear direction but also a curved direction.
  • the output means outputs the driving force in the direction along the extending direction of the guide shaft from the output end to the guide shaft.
  • the “output unit” is, for example, an ultrasonic motor that outputs a driving force based on the following principle.
  • An ultrasonic motor for example, applies an elliptical motion obtained by applying a high-frequency alternating voltage in the ultrasonic region to a piezoelectric element and resonating with that frequency to generate a longitudinal resonance motion and a lateral resonance motion as a driving force from the output end. It is a motor that outputs.
  • the “output means” is not limited to the one that operates on this principle as long as it can output the driving force in the direction along the extending direction of the guide shaft.
  • this output means translates with this drive subject by being combined with the drive subject outside. That is, since the output means adopts a moving object fixing structure, the output means translates with the driving object while driving the driving object. Then, since the relative positional relationship between the moving object and the output unit does not change, it is possible to suppress the deflection of the guide shaft and maintain stable driving.
  • the coupling means couples the driving object and the output means so that the output means outputs the driving force to the guide shaft from a position facing the driving object across the guide shaft.
  • the output means outputs the driving force to the guide shaft from the position facing the drive object across the guide shaft”, in other words, the guide shaft is output on both sides by the output means and the drive object. In other words, the driving force is output to the guide shaft while being sandwiched between the two. Thereby, a drive target object and an output means are displaced relatively with respect to a guide shaft. At this time, since the output means is not built in the moving object, it is difficult to receive vibration by the output means, and the moving object can be made thin.
  • the coupling means and the driven object and the coupling means and the output means are coupled by, for example, a spiral, a spring, an adhesive, or welding.
  • the driving device of the present invention it is possible to reduce noise and maintain stable driving when driving a driving object.
  • vibration transmitted from the ultrasonic motor to the moving object can be suitably suppressed, and the moving object can be made thin, which is very advantageous in practice.
  • the coupling unit is unnecessary for driving the driving object in the predetermined direction among vibrations generated when the output unit outputs the driving force. Reduce the directional component.
  • the components in the direction unnecessary for driving the driving object in the predetermined direction are mixed, and the components are In view of the fact that the driven object is vibrated more than necessary, the component is reduced. Thereby, it is possible to suitably suppress vibration transmitted from the output means to the moving object.
  • the side surface of the guide shaft is formed with a flat surface along the extending direction of the guide shaft, and the output means is formed on the flat surface formed on the side surface of the guide shaft.
  • the driving force is output, and the coupling means is a direction unnecessary for driving the driving object in the predetermined direction among vibrations generated when the output means outputs the driving force. The component in the direction parallel to the plane formed on the side surface of the guide shaft and intersecting the predetermined direction may be reduced.
  • the guide shaft may be, for example, a polygonal column such as a triangular column or a quadrangular column, or a column having a D-cut surface.
  • a driving force is output with respect to this plane.
  • plane as used herein is not limited to a plane in a strict sense, but in a broad sense, a curved surface having a small curvature or a slight undulation as long as the driving force can be transmitted from the output end of the output means.
  • the coupling means reduces the vibration of the component. Thereby, it is possible to suitably suppress vibration transmitted from the output means to the moving object.
  • bonding means may elastically displace along an unnecessary direction in order to drive the said drive target object to the said predetermined direction.
  • the coupling means is elastically displaced along the unnecessary direction.
  • the coupling means may be composed of a relatively high-elasticity coupling plate such as metal or elastic rubber, or the coupling plate and the output means are not required as described above while the coupling plate has low elasticity. It is good also as a structure fastened with the spring which expands-contracts in a direction. In any case, vibrations transmitted from the ultrasonic motor to the moving object can be suitably suppressed.
  • the output means and the driven object may be provided with bearings for the guide shaft individually.
  • the driven object is provided with the guide shaft bearing, but also the output means is provided with the guide shaft bearing individually.
  • the output means is provided with the guide shaft bearing individually.
  • the output means also includes a bearing as described above
  • the bearing provided in the output means is formed with a hole through which the guide shaft passes, and the length of the hole in the direction in which the coupling means is elastically displaced is It is preferable that the cross-section of the guide shaft is larger than that of the guide shaft, and the contact state between the side surface of the guide shaft and the output end of the output means is maintained when the coupling means is elastically displaced.
  • the length of the hole formed in the bearing included in the output means in the direction in which the coupling means is elastically displaced is longer than the length of the cross section of the guide shaft, so that the coupling means is elastically displaced in that direction. Some room is left.
  • the coupling means is elastically displaced, the length is limited to a range in which the contact state between the side surface of the guide shaft and the output end of the output means is maintained, so that stable driving can be maintained. It is.
  • the driving device further includes a biasing unit that biases the output unit against the side surface of the guide shaft.
  • the driving force is firmly transmitted by the biasing means including a spring or the like.
  • the biasing means including a spring or the like.
  • the output means outputs a driving force from the vertical side to the guide shaft, an urging force is generated due to the weight of the output means, whereas when the driving force is output from the horizontal side, the urging force due to the weight of the output means is generated. This is effective because no occurs.
  • the urging means may be a mechanism (manual / FB control) that can release the urging as necessary.
  • the output means is an ultrasonic motor
  • the driving object is a pickup apparatus
  • the driving apparatus is used as a feeding mechanism of the pickup apparatus.
  • the information recording / reproducing apparatus refers to an apparatus capable of realizing at least one of a function of recording information on a recording medium and a function of reproducing information recorded on the recording medium, for example.
  • the pickup device refers to a device that includes a laser light source for recording or reproducing information on a recording medium such as a CD (Compact Disc), a DVD, or a BD (Blu-ray Disc), and a light receiving unit.
  • the recording medium is not limited to a disk-like one, and any mode is applicable as long as the pickup device needs to be driven in a predetermined direction.
  • the information recording / reproducing apparatus of the present invention can also cope with various aspects of the drive apparatus of the present invention described above.
  • the information recording / reproducing apparatus 1 which uses the drive device which concerns on the Example of this invention as a feed mechanism of a pick-up apparatus is shown partially, (a) Top view, (b) Sectional drawing in the straight line LM, (c) The It is an expanded sectional view. It is a top view which shows the structural example of the ultrasonic motor 2 which concerns on an Example (a: When the energizing switch 214 is OFF, b: When the energizing switch 214 is ON). It is a top view which shows a mode that the ultrasonic motor 2 which concerns on an Example drives the base 14 for pick-up apparatuses (a: When driving in the direction A, b: When driving in the direction B).
  • FIG. 1 partially shows an information recording / reproducing apparatus 1 using a drive device according to an embodiment of the present invention as a feeding mechanism of a pickup device, (a) a top view, (b) a sectional view along a straight line LM, (C) It is the expanded sectional view.
  • the configuration of other parts of the information recording / reproducing apparatus 1 may be the same as a known one, and the detailed configuration diagram thereof is omitted as appropriate.
  • the information recording / reproducing apparatus 1 is an apparatus for recording and reproducing information on a recording medium 200.
  • the substrate 11 of the information recording / reproducing apparatus 1 includes a hub portion 16.
  • the hub unit 16 clamps the recording medium 200 at the center thereof, and rotates the recording medium 200 at a predetermined linear velocity in response to the rotational force of a spindle motor (not shown).
  • An opening 13 is formed in the substrate 11.
  • the opening 13 has such a shape that the pickup device base 14 can be driven from the outer peripheral edge of the recording medium 200 to the vicinity of the center along the radial direction of the recording medium 200.
  • the pickup device base 14 is a base for mounting a pickup device (not shown).
  • the pickup device irradiates the recording medium 200 with laser light for writing information or reading information, and enters and detects reflected light from the recording medium 200 to record and reproduce information.
  • the pickup device base 14 is formed with an arc-shaped recess that matches the outer shape of the hub portion 16 so as to be close to the hub portion 16, and the thicknesses of the guide shaft 17 and the guide shaft 18 are formed on the side portions thereof.
  • the number of the bearing portions is preferably three or more from the viewpoint of balance of the pickup device base 14.
  • the guide shaft 17 and the guide shaft 18 extend in the opening 13 in a direction along the radial direction of the recording medium 200 and are arranged so as to be substantially parallel to each other.
  • the guide shaft 17 is a cylinder, for example, and both ends thereof are fixed to the substrate 11 by fixing portions 47 and 47.
  • the guide shaft 18 is a pillar having a D-cut surface as described later, for example, and both ends thereof are fixed to the substrate 11 by fixing portions 48 and 48.
  • the ultrasonic motor 2 is fixed to the pickup device base 14 by a plate-like coupling portion 15 so that the output end portion 20 thereof is in contact with the guide shaft 18.
  • the ultrasonic motor 2 is connected to the microprocessor 100 via the wiring 101 and operates by receiving a drive control signal from the microprocessor 100. During the operation, the ultrasonic motor 2 outputs a driving force in the direction A or the direction B along the extending direction of the guide shaft 18 to the guide shaft 18.
  • the ultrasonic motor 2 is fixed to the pickup device base 14 as a driving object via the coupling portion 15. Therefore, it translates with the pedestal 14 for the pickup device. Then, the relative positional relationship between the pickup apparatus base 14 and the ultrasonic motor 2 does not change. As a result, it is possible to suppress the deflection of the guide shaft 18 and maintain stable driving.
  • the guide shaft 18 is a pillar having a D-cut surface as described later. That is, the guide shaft 18 has a shape based on a cylinder, and a flat surface 182 is formed on a part of the side surface along the extending direction of the guide shaft. The curved surface 181 is the remaining side surface.
  • the ultrasonic motor 2 outputs a driving force in the direction A or the direction B from the output end 20 to the plane 218 of the guide shaft 18.
  • the coupling portion 15 is used for the pickup device so that the ultrasonic motor 2 outputs a driving force to the guide shaft 18 from a position facing the pickup device base 14 with the guide shaft 18 interposed therebetween.
  • the base 14 and the ultrasonic motor 2 are coupled.
  • the pickup device base 14 since the ultrasonic motor 2 is not built in the pickup device base 14, the pickup device base 14 and a pickup device (not shown) mounted thereon. Is less susceptible to vibration from the ultrasonic motor 2. In addition, the pickup device base 14 can be made thinner.
  • FIG. 2 is a top view illustrating a configuration example of the ultrasonic motor 2 according to the embodiment.
  • the case 281 of the ultrasonic motor 2 has a plate-like piezoelectric ceramic 291 having short sides 283 and 285 and long sides 287 and 289. Two (piezoelectric elements) are stacked and accommodated.
  • an opening 293 is provided on one short side 283 side of the piezoelectric ceramic 291, and the output end 20 (for example, a contact with the flat surface 182 of the guide shaft 18 is provided on the short side 283 of the opening 293.
  • the ceramic spacer is fixed.
  • a rectangular electrode 297, 299, 201, 203 is plated on one surface of the piezoelectric ceramic 291 and an electrode covering almost the entire surface is plated on the back surface.
  • the diagonal position electrode 297 and the electrode 203 are connected by a lead wire 205, and the diagonal position electrode 299 and the electrode 201 are connected by a lead wire 207.
  • spring-loaded supports 209 and 209 made of, for example, cylindrical silicon rubber are disposed, and the other long side 287 of the piezoelectric ceramic 291 is disposed on the case. 281 is pressed.
  • the case 281 whose long side 287 is pressed forms fixed supports 211 and 211.
  • the spring-loaded support 209, the fixed support 211, and the piezoelectric ceramic 291 are slidable.
  • a spring-loaded support 213 is disposed between the short side 285 of the piezoelectric ceramic 291 and the case 281, and biases the piezoelectric ceramic 291 against the flat surface 182 of the guide shaft 18 via the output end 20.
  • the urging switch 214 is a mechanism that can adjust the urging force of the spring-loaded support 213 between at least two stages (that is, on / off) between the spring-loaded support 213 and the case 281.
  • the urging switch 214 adjusts the urging force by switching the degree of tightening of bolts, switching between mechanical connection and absence, or applying a voltage to the piezoelectric element.
  • the periphery of the opening 293 serves as a stopper for the piezoelectric ceramic 291 when the short side 283 is urged by the spring-loaded support 113.
  • excitation of the piezoelectric ceramic 291 is performed with an AC voltage or a pulse voltage having a frequency near the resonance point (for example, 40 KHz).
  • the temporal response of the spring-loaded support 213 is sufficiently slower than the resonance frequency of the piezoelectric ceramic 291.
  • FIG. 3 is a top view illustrating a state in which the ultrasonic motor 2 according to the embodiment drives the pickup device base 14.
  • the operating principle for the ultrasonic motor 2 to drive the pickup device base 14 in the direction A is as follows. That is, when a positive pulse is applied to the electrodes 299 and 201 and a negative pulse is applied to the electrodes 297 and 203, the piezoelectric ceramic 291 is deformed so that the long side 287 is longer than the long side 289 with each vibration, and the output end portion 20 moves elliptically.
  • the temporal response of the spring-loaded support 213 is sufficiently slower than the resonance frequency of the piezoelectric ceramic 291, the output end 20 is only oscillated in one direction by the spring-loaded support 213.
  • the vibration of the piezoelectric ceramic 291 is converted into a driving force in one direction (direction B in the case of FIG. 3A).
  • the driving force in the direction B is output from the output end 20 of the ultrasonic motor 2 to the guide shaft 18 by the frictional force generated by the biasing force of the spring-loaded support 113.
  • the ultrasonic motor 2 and the pickup device base 14 translate in the direction A. That is, the ultrasonic motor 2 drives the pickup device base 14 in the direction A.
  • the ultrasonic motor 2 can obtain a large driving force at a lower speed than the electromagnetic motor, and the driving force of the piezoelectric ceramic 291 is directly transmitted to the plane 182 of the guide shaft 18 by the frictional force.
  • a gear mechanism for converting to a linear direction is not required.
  • the operating principle for the ultrasonic motor 2 to drive the pickup device base 14 in the direction B is as follows. That is, when a negative pulse is applied to the electrodes 299 and 201 and a positive pulse is applied to the electrodes 297 and 203, the piezoelectric ceramic 291 has a long side 287 having a long side 289 due to each vibration. The output end 20 is deformed so as to be shorter, and elliptically moves in the direction opposite to that of FIG. Similarly, the vibration of the piezoelectric ceramic 291 is converted into a driving force in one direction (direction A in the case of FIG. 3B).
  • the driving force in the direction A is output from the output end 20 of the ultrasonic motor 2 to the guide shaft 18 by the frictional force generated by the biasing force of the spring-loaded support 113.
  • the ultrasonic motor 2 and the pickup device base 14 translate in the direction B.
  • the ultrasonic motor 2 can output the driving force in the direction A or B along the extending direction of the guide shaft 18 from the output end 20 to the guide shaft 18. It becomes.
  • FIG. 4 is an enlarged cross-sectional view showing a state of vibration transmission from the ultrasonic motor 2 to the pickup device base 14 according to the comparative example.
  • the ultrasonic motor 2 is built in the pickup device base 14. Therefore, the vibration 62 generated when the ultrasonic motor 2 outputs a driving force is directly transmitted to the pickup device base 14 to generate the vibration 614.
  • a component of the vibration 62 that is parallel to the plane 182 formed on the side surface of the guide shaft 18 and intersects the predetermined direction A or direction B causes the pickup device base 14 to move in the predetermined direction A or The vibration is not suppressed by the plane 182 even though it is a component in a direction unnecessary for driving in the direction B.
  • the output end 20 of the ultrasonic motor 2 is in contact with the guide shaft 18 from above. Therefore, the thickness H of the pickup device base 14 is unnecessarily increased.
  • FIG. 5 is an enlarged sectional view showing a state of vibration transmission from the ultrasonic motor 2 to the pickup device base 14 according to the embodiment.
  • the ultrasonic motor 2 is not incorporated in the pickup device base 14, and is coupled to the outside by a coupling portion 15.
  • bond part 15 consists of a comparatively highly elastic coupling board like a metal, an elastic rubber, etc., and elastically displaces along the said unnecessary direction.
  • the ultrasonic motor 2 side bends in the direction of the arrow 715 with the fastening point 715 on the pickup device base 14 side in the coupling portion 15 as a fulcrum.
  • the vibration 62 generated when the ultrasonic motor 2 outputs the driving force is absorbed by the coupling portion 15 and hardly transmitted to the pickup device base 14.
  • the ultrasonic motor 2 is coupled by the coupling unit 15 so as to output a driving force to the guide shaft 18 from a position facing the pickup device base 14 with the guide shaft 18 interposed therebetween. Then, the thickness H of the pickup device base 14 does not increase due to the ultrasonic motor 2.
  • FIG. 6 is an enlarged cross-sectional view showing a state of vibration transmission from the ultrasonic motor 2 to the pickup device base 14 according to the first modification.
  • the coupling portion 15 and the ultrasonic motor 2 are fastened by a coupling elastic portion 51 that expands and contracts in the unnecessary direction. Therefore, the vibration 62 generated when the ultrasonic motor 2 outputs the driving force is absorbed by the expansion and contraction of the coupling elastic part 51 and hardly transmitted to the pickup device base 14.
  • the thickness H of the pickup device base 14 does not increase due to the ultrasonic motor 2 as in the embodiment.
  • the ultrasonic motor 2 is not built in the pickup device base 14, and the vibration of the ultrasonic motor 2 is absorbed by the coupling portion 15. It has been shown that vibration transmitted from the sonic motor 2 to the pickup device base 14 can be suitably suppressed, and in addition, the pickup device base 14 can be made thinner.
  • FIG. 7 is an enlarged cross-sectional view showing a problem caused by vibration of the ultrasonic motor 2 according to the first modification.
  • FIG. 8 is an enlarged cross-sectional view and a perspective view thereof partially showing the information recording / reproducing apparatus 1 using the drive device according to the second modification as a feeding mechanism of the pickup device (however, the ultrasonic motor 2 includes The built-in piezoelectric ceramic 291 etc. are omitted).
  • FIG. 9 is a top view illustrating a state in which the ultrasonic motor 2 drives the pickup device base 14 according to the second modification (a: when driving in the direction A, b: when driving in the direction B). .
  • the ultrasonic motor 2 includes bearings 2812 and 2813 in the vicinity of the opening 293, and holes 2822 and 2823 that allow the guide shaft 18 to pass therethrough.
  • the lengths of the holes 2822 and 2823 in the direction in which the coupling elastic portion 51 is elastically displaced are longer than the plane 182 formed on the guide shaft 18. This leaves some room for elastic displacement of the coupling elastic part 51 in the direction indicated by the arrow 751 and can suitably absorb the vibration 62 generated when the ultrasonic motor 2 outputs the driving force. .
  • the lengths of the holes 2822 and 2823 in the direction in which the coupling elastic portion 51 is elastically displaced are the planes formed on the guide shaft 18 when the coupling elastic portion 51 is elastically displaced. This is a range in which the contact state between 182 and the output end 20 of the ultrasonic motor 2 is maintained. Thereby, the stable drive by the ultrasonic motor 2 can be maintained.
  • FIGS. 7 to 9 show that the vibration 62 generated when the ultrasonic motor 2 outputs the driving force can be suitably absorbed and stable driving can be maintained. It was done.
  • the “pickup device base 14” is an example of the “driving object” according to the present invention
  • “Substrate 11” is an example of the “substrate” according to the present invention
  • the “guide shaft 18” is an example of the “guide shaft” according to the present invention
  • “Direction A” and “Direction B” are examples of "the direction along the extension direction of the guide shaft” according to the present invention
  • the “plane 182” is an example of the “side surface of the guide shaft” according to the present invention, and is an example of the “plane” formed along the extension direction of the guide shaft according to the present invention
  • “Ultrasonic motor 2" is an example of "output means” according to the present invention
  • “Output end 20” is an example of “output end” according to the present invention
  • “Coupling portion 15” and “coupling elastic portion 51” are examples of “coupling means” according to the present invention
  • “Bearing part 2812” and “bearing part 2813”
  • the present invention can be used in the technical field of a drive device using an ultrasonic motor that drives, for example, an optical pickup or other drive target along the extension direction of the guide shaft.

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  • General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)

Abstract

A driving unit (1) is a unit for moving an object to be moved (14) in a given direction, the driving unit being fixed to a base plate (11), and comprising a guide bearing (18) extending in a given direction, an outputting means (2) for outputting a driving force from an output end (20) to the guide bearing in a direction along the extending direction of the guide bearing as well as moving in parallel with the object to be moved by being coupled to the object to be moved, and coupling means (15, 51) for coupling the object to be moved and the outputting means to allow the outputting means to output the driving force to the guide bearing from a position in which it faces to the object to be moved with the guide bearing being interposed therebetween.

Description

移動装置Mobile device
　本発明は、例えば光ピックアップその他の駆動対象物を案内軸の伸長方向に沿って駆動する、超音波モータを用いた駆動装置の技術分野に関する。 The present invention relates to a technical field of a drive device using an ultrasonic motor that drives, for example, an optical pickup or other drive object along the extension direction of a guide shaft.
　この種の駆動装置として、一般的には電磁モータを利用するものが知られている。ところが、電磁モータは回転出力であるので、駆動対象物を案内軸に沿って駆動させるにあたり、電磁モータの出力を回転方向から案内軸の伸長方向に沿った方向へと変換するために、係合式のギヤ機構を介在させる必要がある。しかしながら、かかるギヤ機構の介在により、駆動時には係合部から騒音を生じてしまう。 As this type of drive device, one using an electromagnetic motor is generally known. However, since the electromagnetic motor is a rotational output, in order to convert the output of the electromagnetic motor from the rotational direction to the direction along the extending direction of the guide shaft when the driven object is driven along the guide shaft, the engagement type It is necessary to intervene the gear mechanism. However, due to the gear mechanism, noise is generated from the engaging portion during driving.
　そこで、当初から案内軸の伸長方向に沿った方向の駆動力を出力するべく、特許文献１から特許文献５には、超音波モータを利用した駆動装置が提案されている。 Therefore, in order to output a driving force in the direction along the extending direction of the guide shaft from the beginning, Patent Documents 1 to 5 propose driving apparatuses using ultrasonic motors.
　しかしながら、例えば前述の特許文献１から特許文献５に開示されている技術では、以下のような問題が生じ得る。 However, for example, the techniques disclosed in Patent Document 1 to Patent Document 5 described above may cause the following problems.
　特許文献１から特許文献４は、超音波モータが、移動対象物に固定されているのではなく、案内軸を備えた基板側に固定されている基板固定構造を採るので、移動対象物と超音波モータとの相対的な位置関係が変化する。このため、移動対象物が超音波モータから離れるにつれて案内軸の撓みが増大してしまい、その影響で超音波モータによる押付圧（つまり、駆動力）が変化してしまう。ゆえに、安定した駆動を維持できない虞がある。 Patent Documents 1 to 4 adopt a substrate fixing structure in which the ultrasonic motor is not fixed to the moving object but is fixed to the substrate side provided with the guide shaft. The relative positional relationship with the sonic motor changes. For this reason, the deflection of the guide shaft increases as the moving object moves away from the ultrasonic motor, and the pressing pressure (that is, the driving force) by the ultrasonic motor changes due to the influence. Therefore, there is a possibility that stable driving cannot be maintained.
　これに対し、特許文献５は、超音波モータが、移動対象物に固定されている移動対象物固定構造を採るので、移動対象物（この場合、光ピックアップ５）と超音波モータとの相対的な位置関係が変化しない。しかしながら、特許文献５の第３図によれば、超音波モータが移動対象物に内蔵されてしまっているので、超音波モータによる振動を受けやすいうえに、移動対象物の薄型化が妨げられる。特に、超音波モータは、案内軸に駆動力を伝動するべく、案内軸に対して付勢するための付勢機構が必要となるが、かかる付勢機構の占有スペースが、移動対象物の小型化や薄型化を妨げる。 On the other hand, since the ultrasonic motor employs a moving object fixing structure in which the ultrasonic motor is fixed to the moving object, the relative relationship between the moving object (in this case, the optical pickup 5) and the ultrasonic motor is described. The relative position does not change. However, according to FIG. 3 of Patent Document 5, since the ultrasonic motor is built in the moving object, it is easy to receive vibrations from the ultrasonic motor, and the moving object is prevented from being thinned. In particular, an ultrasonic motor requires a biasing mechanism for biasing the guide shaft so as to transmit a driving force to the guide shaft. However, the space occupied by the biasing mechanism is small in size of the moving object. Obstructing the reduction in thickness and thickness.
特開平９－３５４３３号公報JP-A-9-35433 特開平９－９１８９１号公報JP-A-9-91891 特開２００２－３６７２９９号公報JP 2002-367299 A 特開２００２－３６７３００号公報JP 2002-367300 A 実開平０２－０６０９６３号公報Japanese Utility Model Publication No. 02-060963
　本発明は、例えば上述した問題点に鑑みてなされたものであり、駆動対象物を駆動する際に、騒音を低減するとともに、安定した駆動を維持可能とする駆動装置であって、超音波モータから移動対象物へと伝動する振動を好適に抑制可能であるとともに、移動対象物の薄型化を可能とする駆動装置を提供することを課題とする。 The present invention has been made in view of, for example, the above-described problems, and is a driving device that reduces noise and can maintain stable driving when an object to be driven is driven. It is an object of the present invention to provide a drive device that can suitably suppress vibration transmitted from a moving object to a moving object and that can reduce the thickness of the moving object.
　本発明に係る駆動装置は、上述の課題を解決するために、駆動対象物を所定の方向へ駆動する駆動装置であって、基板に固定されており、前記所定の方向に伸長している案内軸と、前記案内軸の伸長方向に沿った方向の駆動力を出力端部から前記案内軸に対して出力するとともに、前記駆動対象物に結合されることで該駆動対象物と並進する出力手段と、前記出力手段が、前記案内軸を挟んで、前記駆動対象物と対向する位置から、前記駆動力を前記案内軸に対して出力するように、前記駆動対象物と前記出力手段とを結合する結合手段とを備える。 In order to solve the above-described problem, the drive device according to the present invention is a drive device that drives a drive object in a predetermined direction, and is a guide that is fixed to a substrate and extends in the predetermined direction. An output means for outputting a driving force in the direction along the direction of extension of the shaft and the guide shaft from the output end to the guide shaft and translating to the drive target by being coupled to the drive target And the output object is coupled to the output means so that the output force is output to the guide shaft from a position facing the drive object across the guide shaft. Coupling means.
　本発明に係る駆動装置によれば、以下のような作用により、駆動対象物を所定の方向へ好適に駆動することが可能となる。 According to the drive device according to the present invention, the drive object can be suitably driven in a predetermined direction by the following operation.
　案内軸は、その両端で、片端で、又は他の個所で、基板に固定されており、所定の方向に伸長し、駆動対象物の移動又は摺動を支持する。「所定の方向」とは、駆動対象物を駆動させたい方向として予め定められた方向、又はその使用時に適宜変更されうる方向であり、直線方向のみならず、曲線方向も含む。 The guide shaft is fixed to the substrate at both ends, at one end, or at other points, and extends in a predetermined direction to support the movement or sliding of the driven object. The “predetermined direction” is a direction predetermined as a direction in which the driven object is desired to be driven, or a direction that can be appropriately changed when used, and includes not only a linear direction but also a curved direction.
　出力手段は、案内軸の伸長方向に沿った方向の駆動力を出力端部から案内軸に対して出力する。「出力手段」は、例えば次のような原理で駆動力を出力する超音波モータである。超音波モータは、例えば、圧電素子に超音波領域の高周波交流電圧を加え、その周波数に共振して生じる縦方向共振運動と横方向共振運動を合成した楕円運動を、駆動力として出力端部から出力するモータである。なお、「出力手段」は、案内軸の伸長方向に沿った方向の駆動力を出力可能な限り、この原理で作動するものに限らない。そして、この出力手段は、駆動対象物に、その外部で結合されることで該駆動対象物と並進する。つまり、この出力手段は、移動対象物固定構造を採るので、駆動対象物を駆動しつつも、自身が駆動対象物と並進することになる。そうすると、移動対象物と出力手段との相対的な位置関係が変化しないので、案内軸の撓みを抑制し、もって安定した駆動を維持することが可能となる。 The output means outputs the driving force in the direction along the extending direction of the guide shaft from the output end to the guide shaft. The “output unit” is, for example, an ultrasonic motor that outputs a driving force based on the following principle. An ultrasonic motor, for example, applies an elliptical motion obtained by applying a high-frequency alternating voltage in the ultrasonic region to a piezoelectric element and resonating with that frequency to generate a longitudinal resonance motion and a lateral resonance motion as a driving force from the output end. It is a motor that outputs. The “output means” is not limited to the one that operates on this principle as long as it can output the driving force in the direction along the extending direction of the guide shaft. And this output means translates with this drive subject by being combined with the drive subject outside. That is, since the output means adopts a moving object fixing structure, the output means translates with the driving object while driving the driving object. Then, since the relative positional relationship between the moving object and the output unit does not change, it is possible to suppress the deflection of the guide shaft and maintain stable driving.
　本発明では更に、出力手段が、案内軸を挟んで、駆動対象物と対向する位置から、駆動力を案内軸に対して出力するように、結合手段が、駆動対象物と出力手段とを結合する。「出力手段が、案内軸を挟んで、駆動対象物と対向する位置から、駆動力を案内軸に対して出力する」というのは、言い換えれば、案内軸を出力手段と駆動対象物とによって両側から挟んだ状態で、駆動力を案内軸に対して出力するということである。これにより、駆動対象物及び出力手段は、案内軸に対して相対的に変位する。この際、出力手段が移動対象物に内蔵されていないので、出力手段による振動を受けにくく、しかも、移動対象物の薄型化が可能である。なお、結合手段と駆動対象物との間、および結合手段と出力手段との間は、例えば、螺旋、バネ、接着剤、あるいは溶接等によって結合されている。 In the present invention, the coupling means couples the driving object and the output means so that the output means outputs the driving force to the guide shaft from a position facing the driving object across the guide shaft. To do. “The output means outputs the driving force to the guide shaft from the position facing the drive object across the guide shaft”, in other words, the guide shaft is output on both sides by the output means and the drive object. In other words, the driving force is output to the guide shaft while being sandwiched between the two. Thereby, a drive target object and an output means are displaced relatively with respect to a guide shaft. At this time, since the output means is not built in the moving object, it is difficult to receive vibration by the output means, and the moving object can be made thin. Note that the coupling means and the driven object and the coupling means and the output means are coupled by, for example, a spiral, a spring, an adhesive, or welding.
　以上みてきたように、本発明に係る駆動装置によれば、駆動対象物を駆動する際に、騒音を低減するとともに、安定した駆動を維持することが可能となる。しかも、超音波モータから移動対象物へと伝動する振動を好適に抑制可能であるとともに、移動対象物の薄型化を可能であり、実践上非常に有利といえる。 As described above, according to the driving device of the present invention, it is possible to reduce noise and maintain stable driving when driving a driving object. In addition, vibration transmitted from the ultrasonic motor to the moving object can be suitably suppressed, and the moving object can be made thin, which is very advantageous in practice.
　本発明に係る駆動装置の一態様では、前記結合手段は、前記出力手段が前記駆動力を出力する際に生じる振動のうち、前記駆動対象物を前記所定の方向へ駆動するためには不要な方向の成分を低減する。 In one aspect of the driving apparatus according to the present invention, the coupling unit is unnecessary for driving the driving object in the predetermined direction among vibrations generated when the output unit outputs the driving force. Reduce the directional component.
　この態様によれば、出力手段が駆動力を出力する際に生じる振動のうち、駆動対象物を所定の方向へ駆動するためには不要な方向の成分が混在しており、当該成分が、前記駆動対象物を必要以上に振動させてしまうことに鑑みて、当該成分を低減する。これにより、出力手段から移動対象物へと伝動する振動を好適に抑制可能となる。 According to this aspect, among the vibrations generated when the output means outputs the driving force, the components in the direction unnecessary for driving the driving object in the predetermined direction are mixed, and the components are In view of the fact that the driven object is vibrated more than necessary, the component is reduced. Thereby, it is possible to suitably suppress vibration transmitted from the output means to the moving object.
　上記一態様では、前記案内軸の側面のうち少なくとも一部には、前記案内軸の伸長方向に沿って平面が形成されており、前記出力手段は、前記案内軸の側面に形成された平面に対して、前記駆動力を出力し、前記結合手段は、前記出力手段が前記駆動力を出力する際に生じる振動のうち、前記駆動対象物を前記所定の方向へ駆動するためには不要な方向の成分として、前記案内軸の側面に形成された平面と平行であって、かつ、前記所定の方向に交わる方向の成分を低減するとよい。 In the above aspect, at least a part of the side surface of the guide shaft is formed with a flat surface along the extending direction of the guide shaft, and the output means is formed on the flat surface formed on the side surface of the guide shaft. On the other hand, the driving force is output, and the coupling means is a direction unnecessary for driving the driving object in the predetermined direction among vibrations generated when the output means outputs the driving force. The component in the direction parallel to the plane formed on the side surface of the guide shaft and intersecting the predetermined direction may be reduced.
　この態様によれば、案内軸の側面のうち少なくとも一部には、案内軸の伸長方向に沿って平面が形成されている。すなわち、案内軸は、例えば、三角柱や四角柱等のような多角柱でもよいし、又はＤカット面を有する柱でもよい。そして、この平面に対して、駆動力が出力される。なお、ここで言う「平面」には、厳密な意味での平面のみならず、広義には、出力手段の出力端部から駆動力を伝動可能な限り、微小な曲率を有する曲面や若干の起伏を有する面も含まれる。さてここで、出力手段が駆動力を出力する際に生じる振動のうち、案内軸の側面に形成された平面と平行であって、かつ、所定の方向に交わる方向の成分（典型的には直交する成分）は、駆動対象物を所定の方向へ駆動するためには不要な方向の成分であるであるにもかかわらず、案内軸の側面に形成された平面によって抑制されることもない。そこで、結合手段は、当該成分の振動を低減する。これにより、出力手段から移動対象物へと伝動する振動を好適に抑制可能となる。 According to this aspect, at least a part of the side surface of the guide shaft is formed with a flat surface along the extending direction of the guide shaft. That is, the guide shaft may be, for example, a polygonal column such as a triangular column or a quadrangular column, or a column having a D-cut surface. And a driving force is output with respect to this plane. In addition, the term “plane” as used herein is not limited to a plane in a strict sense, but in a broad sense, a curved surface having a small curvature or a slight undulation as long as the driving force can be transmitted from the output end of the output means. Also included is a surface having Now, among the vibrations generated when the output means outputs the driving force, the component in the direction parallel to the plane formed on the side surface of the guide shaft and intersecting the predetermined direction (typically orthogonal) The component to be driven) is not suppressed by the plane formed on the side surface of the guide shaft, although it is a component in a direction unnecessary for driving the driven object in a predetermined direction. Therefore, the coupling means reduces the vibration of the component. Thereby, it is possible to suitably suppress vibration transmitted from the output means to the moving object.
　或いは、上記一態様では、前記結合手段は、前記駆動対象物を前記所定の方向へ駆動するためには不要な方向に沿って弾性変位させてもよい。 Or in the said one aspect | mode, the said coupling | bonding means may elastically displace along an unnecessary direction in order to drive the said drive target object to the said predetermined direction.
　この態様によれば、結合手段は、上記不要な方向に沿って弾性変位する。ここで、結合手段は、金属や弾性ゴム等のように比較的高弾性な結合板からなる構成としてもよいし、結合板は低弾性としつつも該結合板と出力手段とを、上記不要な方向に伸縮するバネによって留める構成としてもよい。いずれにせよ、超音波モータから移動対象物へと伝動する振動を好適に抑制可能となる。 According to this aspect, the coupling means is elastically displaced along the unnecessary direction. Here, the coupling means may be composed of a relatively high-elasticity coupling plate such as metal or elastic rubber, or the coupling plate and the output means are not required as described above while the coupling plate has low elasticity. It is good also as a structure fastened with the spring which expands-contracts in a direction. In any case, vibrations transmitted from the ultrasonic motor to the moving object can be suitably suppressed.
　上記のように結合手段が弾性変位する態様では、前記出力手段、および前記駆動対象物は前記案内軸の軸受けを個別に備えるとよい。 In the aspect in which the coupling means is elastically displaced as described above, the output means and the driven object may be provided with bearings for the guide shaft individually.
　この態様によれば、駆動対象物が案内軸の軸受けを備えるのは勿論、出力手段もが案内軸の軸受けを個別に備える。これにより、結合手段が弾性変位するのに伴い出力手段までが変位してしまうことを回避でき、もって安定した駆動を維持可能とする。 According to this aspect, not only the driven object is provided with the guide shaft bearing, but also the output means is provided with the guide shaft bearing individually. As a result, it is possible to avoid the displacement of the output means as the coupling means is elastically displaced, so that stable driving can be maintained.
　上記のように出力手段も軸受けを備える態様では、前記出力手段が備える軸受けには前記案内軸を貫通させる孔が形成されており、該孔の、前記結合手段が弾性変位する方向における長さは、前記案内軸の断面のそれ以上であり、かつ、前記結合手段が弾性変位する際に前記案内軸の側面と前記出力手段の出力端部との接触状態が維持される範囲であるとよい。 In the aspect in which the output means also includes a bearing as described above, the bearing provided in the output means is formed with a hole through which the guide shaft passes, and the length of the hole in the direction in which the coupling means is elastically displaced is It is preferable that the cross-section of the guide shaft is larger than that of the guide shaft, and the contact state between the side surface of the guide shaft and the output end of the output means is maintained when the coupling means is elastically displaced.
　この態様によれば、出力手段が備える軸受けに形成された孔の、結合手段が弾性変位する方向における長さは、案内軸の断面のそれ以上であるので、その方向において結合手段が弾性変位する余裕が幾らか残されている。加えて、その長さは、結合手段が弾性変位する際に、案内軸の側面と出力手段の出力端部との接触状態が維持される範囲に抑えられているので、安定した駆動を維持可能である。 According to this aspect, the length of the hole formed in the bearing included in the output means in the direction in which the coupling means is elastically displaced is longer than the length of the cross section of the guide shaft, so that the coupling means is elastically displaced in that direction. Some room is left. In addition, when the coupling means is elastically displaced, the length is limited to a range in which the contact state between the side surface of the guide shaft and the output end of the output means is maintained, so that stable driving can be maintained. It is.
　本発明に係る駆動装置の他態様では、前記出力手段を、前記案内軸の側面に対して付勢する付勢手段を更に備える。 In another aspect of the driving apparatus according to the present invention, the driving device further includes a biasing unit that biases the output unit against the side surface of the guide shaft.
　この態様によれば、案内軸の側面と出力手段の出力端部とが点接触のように接触面積が極めて少ない場合であっても、バネ等からなる付勢手段によって駆動力をしっかりと伝えることができる。特に、出力手段が案内軸に垂直側から駆動力を出力する場合には出力手段の自重による付勢力が生じるのに対し、水平側から駆動力を出力する場合には出力手段の自重による付勢力が生じないので、有効である。この際、出力手段は移動対象物に内蔵されていないので、付勢手段の形状によらず、移動対象物の薄型化が可能となる。尚、付勢手段は、必要に応じてその付勢を適宜解除できる機構（手動／ＦＢ制御）とするとよい。 According to this aspect, even when the contact area between the side surface of the guide shaft and the output end of the output means is extremely small, such as point contact, the driving force is firmly transmitted by the biasing means including a spring or the like. Can do. In particular, when the output means outputs a driving force from the vertical side to the guide shaft, an urging force is generated due to the weight of the output means, whereas when the driving force is output from the horizontal side, the urging force due to the weight of the output means is generated. This is effective because no occurs. At this time, since the output means is not built in the moving object, the moving object can be made thin regardless of the shape of the biasing means. The urging means may be a mechanism (manual / FB control) that can release the urging as necessary.
　本発明に係る情報記録再生装置は、上述の課題を解決するために、前記出力手段が超音波モータであり、前記駆動対象物がピックアップ装置であり、前記駆動装置をピックアップ装置の送り機構として用いる。 In the information recording / reproducing apparatus according to the present invention, in order to solve the above-described problem, the output means is an ultrasonic motor, the driving object is a pickup apparatus, and the driving apparatus is used as a feeding mechanism of the pickup apparatus. .
　この態様によれば、情報記録再生装置による情報の記録又は再生時にピックアップ装置を駆動する際に、騒音を低減するとともに、安定した駆動を維持することが可能となる。因みに、情報記録再生装置とは、例えば、記録媒体に情報を記録する機能、及び記録媒体に記録した情報を再生する機能のうち、少なくとも一方を実現可能な装置をいう。ピックアップ装置とは、ＣＤ（Ｃｏｍｐａｃｔ　Ｄｉｓｃ）、ＤＶＤ、又はＢＤ（Ｂｌｕ－ｒａｙ　Ｄｉｓｃ）等の記録媒体に対して情報の記録又は再生を行なうためのレーザー光源、及び受光部を備える装置をいう。尚、記録媒体は、ディスク状のもののみに限られず、ピックアップ装置を所定の方向に駆動させる必要がある限りにおいて、特に態様は問わない。尚、本発明の情報記録再生装置においても、上述した本発明の駆動装置における各種態様に対応可能である。 According to this aspect, when the pickup device is driven during recording or reproduction of information by the information recording / reproducing device, noise can be reduced and stable driving can be maintained. Incidentally, the information recording / reproducing apparatus refers to an apparatus capable of realizing at least one of a function of recording information on a recording medium and a function of reproducing information recorded on the recording medium, for example. The pickup device refers to a device that includes a laser light source for recording or reproducing information on a recording medium such as a CD (Compact Disc), a DVD, or a BD (Blu-ray Disc), and a light receiving unit. Note that the recording medium is not limited to a disk-like one, and any mode is applicable as long as the pickup device needs to be driven in a predetermined direction. Note that the information recording / reproducing apparatus of the present invention can also cope with various aspects of the drive apparatus of the present invention described above.
　本発明の作用及び他の利得は次に説明する実施例から明らかにされよう。 The operation and other advantages of the present invention will be made clear from the embodiments described below.
本発明の実施例に係る駆動装置をピックアップ装置の送り機構として用いている情報記録再生装置１を部分的に示す、（ａ）上面図、（ｂ）直線ＬＭにおける断面図、及び（ｃ）その拡大断面図である。The information recording / reproducing apparatus 1 which uses the drive device which concerns on the Example of this invention as a feed mechanism of a pick-up apparatus is shown partially, (a) Top view, (b) Sectional drawing in the straight line LM, (c) The It is an expanded sectional view. 実施例に係る超音波モータ２の構成例を示す上面図である（ａ：付勢スイッチ２１４がオフの場合、ｂ：付勢スイッチ２１４がオンの場合）。It is a top view which shows the structural example of the ultrasonic motor 2 which concerns on an Example (a: When the energizing switch 214 is OFF, b: When the energizing switch 214 is ON). 実施例に係る超音波モータ２がピックアップ装置用台座１４を駆動する様子を示す上面図である（ａ：方向Ａへ駆動する場合、ｂ：方向Ｂへ駆動する場合）。It is a top view which shows a mode that the ultrasonic motor 2 which concerns on an Example drives the base 14 for pick-up apparatuses (a: When driving in the direction A, b: When driving in the direction B). 比較例に係る、超音波モータ２からピックアップ装置用台座１４への振動伝動の様子を示す拡大断面図である。It is an expanded sectional view which shows the mode of the vibration transmission from the ultrasonic motor 2 to the base 14 for pick-up apparatuses based on a comparative example. 実施例に係る、超音波モータ２からピックアップ装置用台座１４への振動伝動の様子を示す拡大断面図である。It is an expanded sectional view which shows the mode of the vibration transmission from the ultrasonic motor 2 to the pick-up apparatus base 14 based on an Example. 第１変形例に係る、超音波モータ２からピックアップ装置用台座１４への振動伝動の様子を示す拡大断面図である。It is an expanded sectional view showing a situation of vibration transmission from ultrasonic motor 2 to pickup device base 14 concerning the 1st modification. 第１変形例に係る、超音波モータ２の振動による課題を示す拡大断面図である。It is an expanded sectional view showing a subject by vibration of ultrasonic motor 2 concerning the 1st modification. 第２変形例に係る駆動装置をピックアップ装置の送り機構として用いている情報記録再生装置１を部分的に示す、拡大断面図とその斜視図である。It is the expanded sectional view and its perspective view which show partially the information recording / reproducing apparatus 1 which uses the drive device which concerns on a 2nd modification as a feed mechanism of a pick-up apparatus. 第２変形例に係る、超音波モータ２がピックアップ装置用台座１４を駆動する様子を示す上面図である（ａ：方向Ａへ駆動する場合、ｂ：方向Ｂへ駆動する場合）。It is a top view which shows a mode that the ultrasonic motor 2 which drives the base 14 for pick-up apparatuses based on a 2nd modification (a: When driving in the direction A, b: When driving in the direction B).
符号の説明Explanation of symbols
　１　情報記録再生装置
　１４　ピックアップ装置用台座
　１１　基板
　１８　案内軸
　１８２　平面
　２　超音波モータ
　２０　出力端部
　４８　固定部
　４８１　固定穴
　２１３　負荷式支持体 DESCRIPTION OF SYMBOLS 1 Information recording / reproducing apparatus 14 Base for pick-up apparatus 11 Board | substrate 18 Guide shaft 182 Plane 2 Ultrasonic motor 20 Output end part 48 Fixed part 481 Fixed hole 213 Load type support body
　以下、本発明を実施するための最良の形態について、実施例毎に順に、図面に基づいて説明する。 Hereinafter, the best mode for carrying out the present invention will be described in each embodiment in order based on the drawings.
　図１は、本発明の実施例に係る駆動装置をピックアップ装置の送り機構として用いている情報記録再生装置１を部分的に示す、（ａ）上面図、（ｂ）直線ＬＭにおける断面図、及び（ｃ）その拡大断面図である。尚、情報記録再生装置１の他の部位の構成は、公知のものと同様でよく、その詳細な構成図は適宜省略してある。 FIG. 1 partially shows an information recording / reproducing apparatus 1 using a drive device according to an embodiment of the present invention as a feeding mechanism of a pickup device, (a) a top view, (b) a sectional view along a straight line LM, (C) It is the expanded sectional view. The configuration of other parts of the information recording / reproducing apparatus 1 may be the same as a known one, and the detailed configuration diagram thereof is omitted as appropriate.
　図１の（ａ）及び図１の（ｂ）に示すように、情報記録再生装置１は、記録媒体２００に対して情報の記録や再生を行なう装置である。 As shown in FIGS. 1A and 1B, the information recording / reproducing apparatus 1 is an apparatus for recording and reproducing information on a recording medium 200.
　情報記録再生装置１の基板１１は、ハブ部１６を備える。ハブ部１６は、記録媒体２００をその中央でクランプすると共に、スピンドルモータ（不図示）の回転力を受けて所定の線速度で回転させる。 The substrate 11 of the information recording / reproducing apparatus 1 includes a hub portion 16. The hub unit 16 clamps the recording medium 200 at the center thereof, and rotates the recording medium 200 at a predetermined linear velocity in response to the rotational force of a spindle motor (not shown).
　基板１１には、開口部１３が形成されている。開口部１３は、ピックアップ装置用台座１４を記録媒体２００の半径方向に沿って、記録媒体２００の外周端から中心部付近まで駆動可能な形状をしている。 An opening 13 is formed in the substrate 11. The opening 13 has such a shape that the pickup device base 14 can be driven from the outer peripheral edge of the recording medium 200 to the vicinity of the center along the radial direction of the recording medium 200.
　ピックアップ装置用台座１４は、ピックアップ装置（不図示）を搭載するための台座である。ピックアップ装置は、記録媒体２００に対して情報書き込み用又は情報読み取り用のレーザー光を照射すると共に、記録媒体２００からの反射光を入射及び検出して、情報の記録や再生を行なう。ピックアップ装置用台座１４は、ハブ部１６に近接可能なようにハブ部１６の外形に合わせた円弧状の凹みが形成されており、その側部には、案内軸１７及び案内軸１８の太さに合わせて貫通孔、又はコの字状の溝が形成された軸受け部１４１、１４２、及び１４３を備える。軸受け部の数は、ピックアップ装置用台座１４のバランスの観点から、３つ以上が好ましい。 The pickup device base 14 is a base for mounting a pickup device (not shown). The pickup device irradiates the recording medium 200 with laser light for writing information or reading information, and enters and detects reflected light from the recording medium 200 to record and reproduce information. The pickup device base 14 is formed with an arc-shaped recess that matches the outer shape of the hub portion 16 so as to be close to the hub portion 16, and the thicknesses of the guide shaft 17 and the guide shaft 18 are formed on the side portions thereof. Are provided with bearing portions 141, 142, and 143 in which through holes or U-shaped grooves are formed. The number of the bearing portions is preferably three or more from the viewpoint of balance of the pickup device base 14.
　案内軸１７及び案内軸１８は、開口部１３において、記録媒体２００の半径方向に沿った方向に伸長しており、互いに略平行となるように配置されている。案内軸１７は、例えば円柱であり、その両端が固定部４７、４７によって基板１１に固定されている。案内軸１８は、例えば後述するようにＤカット面を有する柱であり、その両端が固定部４８、４８によって基板１１に固定されている。 The guide shaft 17 and the guide shaft 18 extend in the opening 13 in a direction along the radial direction of the recording medium 200 and are arranged so as to be substantially parallel to each other. The guide shaft 17 is a cylinder, for example, and both ends thereof are fixed to the substrate 11 by fixing portions 47 and 47. The guide shaft 18 is a pillar having a D-cut surface as described later, for example, and both ends thereof are fixed to the substrate 11 by fixing portions 48 and 48.
　超音波モータ２は、その出力端部２０が案内軸１８に接するように、板状の結合部１５によって、ピックアップ装置用台座１４に固定されている。超音波モータ２は、配線１０１を介して、マイクロプロセッサ１００に接続されており、該マイクロプロセッサ１００から駆動制御信号を受けて動作する。その動作時には、超音波モータ２は、案内軸１８の伸長方向に沿った方向Ａ又は方向Ｂの駆動力を、案内軸１８に対して出力する。 The ultrasonic motor 2 is fixed to the pickup device base 14 by a plate-like coupling portion 15 so that the output end portion 20 thereof is in contact with the guide shaft 18. The ultrasonic motor 2 is connected to the microprocessor 100 via the wiring 101 and operates by receiving a drive control signal from the microprocessor 100. During the operation, the ultrasonic motor 2 outputs a driving force in the direction A or the direction B along the extending direction of the guide shaft 18 to the guide shaft 18.
　以上詳述したように、図１の（ａ）及び図１の（ｂ）によれば、超音波モータ２は、駆動対象物たるピックアップ装置用台座１４に、結合部１５を介して固定されているので、ピックアップ装置用台座１４と並進する。そうすると、ピックアップ装置用台座１４と超音波モータ２との相対的な位置関係が変化しない。これにより、案内軸１８の撓みを抑制し、もって安定した駆動を維持することが可能となる。 As described in detail above, according to FIGS. 1A and 1B, the ultrasonic motor 2 is fixed to the pickup device base 14 as a driving object via the coupling portion 15. Therefore, it translates with the pedestal 14 for the pickup device. Then, the relative positional relationship between the pickup apparatus base 14 and the ultrasonic motor 2 does not change. As a result, it is possible to suppress the deflection of the guide shaft 18 and maintain stable driving.
　更に、図１の（ｃ）に示すように、案内軸１８は、例えば後述するようにＤカット面を有する柱である。すなわち、案内軸１８は、円柱を基礎とした形状であり、その側面の一部には、前記案内軸の伸長方向に沿って平面１８２が形成されている。曲面１８１は、残りの側面である。超音波モータ２は、出力端部２０から、方向Ａ又は方向Ｂの駆動力を、案内軸１８の平面２１８に対して出力する。この際、特に、超音波モータ２が、案内軸１８を挟んで、ピックアップ装置用台座１４と対向する位置から、案内軸１８に対して駆動力を出力するように、結合部１５がピックアップ装置用台座１４と超音波モータ２とを結合している。 Furthermore, as shown in FIG. 1 (c), the guide shaft 18 is a pillar having a D-cut surface as described later. That is, the guide shaft 18 has a shape based on a cylinder, and a flat surface 182 is formed on a part of the side surface along the extending direction of the guide shaft. The curved surface 181 is the remaining side surface. The ultrasonic motor 2 outputs a driving force in the direction A or the direction B from the output end 20 to the plane 218 of the guide shaft 18. At this time, in particular, the coupling portion 15 is used for the pickup device so that the ultrasonic motor 2 outputs a driving force to the guide shaft 18 from a position facing the pickup device base 14 with the guide shaft 18 interposed therebetween. The base 14 and the ultrasonic motor 2 are coupled.
　以上詳述したように、図１の（ｃ）によれば、超音波モータ２がピックアップ装置用台座１４に内蔵されていないので、ピックアップ装置用台座１４およびそれに搭載されるピックアップ装置（不図示）は超音波モータ２による振動を受けにくい。加えて、ピックアップ装置用台座１４の薄型化が可能である。 As described above in detail, according to FIG. 1C, since the ultrasonic motor 2 is not built in the pickup device base 14, the pickup device base 14 and a pickup device (not shown) mounted thereon. Is less susceptible to vibration from the ultrasonic motor 2. In addition, the pickup device base 14 can be made thinner.
　次に、図２を参照して、付勢スイッチ２１４のオン／オフの別による、駆動力の伝動態様について詳述する。図２は、実施例に係る超音波モータ２の構成例を示す上面図である。 Next, with reference to FIG. 2, the transmission mode of the driving force according to whether the energizing switch 214 is turned on or off will be described in detail. FIG. 2 is a top view illustrating a configuration example of the ultrasonic motor 2 according to the embodiment.
　図２の（ａ）、及び図２の（ｂ）に示すように、超音波モータ２のケース２８１には、短辺２８３、２８５と長辺２８７、２８９とを持った板状の圧電セラミック２９１（圧電素子）が２枚重ねて収容されている。ケース２８１には、圧電セラミック２９１の一方の短辺２８３側に開口２９３が設けられており、この開口２９３の短辺２８３上には案内軸１８の平面１８２と接触する出力端部２０（例えば、セラミックスペーサ）が固定されている。 As shown in FIGS. 2A and 2B, the case 281 of the ultrasonic motor 2 has a plate-like piezoelectric ceramic 291 having short sides 283 and 285 and long sides 287 and 289. Two (piezoelectric elements) are stacked and accommodated. In the case 281, an opening 293 is provided on one short side 283 side of the piezoelectric ceramic 291, and the output end 20 (for example, a contact with the flat surface 182 of the guide shaft 18 is provided on the short side 283 of the opening 293. The ceramic spacer is fixed.
　圧電セラミック２９１の一面には、矩形の電極２９７、２９９、２０１、２０３がメッキされており、裏面には略全面を覆う電極がメッキされている。対角位置の電極２９７と電極２０３とはリード線２０５によって接続され、対角位置の電極２９９と電極２０１とはリード線２０７によって接続されている。 A rectangular electrode 297, 299, 201, 203 is plated on one surface of the piezoelectric ceramic 291 and an electrode covering almost the entire surface is plated on the back surface. The diagonal position electrode 297 and the electrode 203 are connected by a lead wire 205, and the diagonal position electrode 299 and the electrode 201 are connected by a lead wire 207.
　圧電セラミック２９１の一方の長辺２８９とケース２８１との間には、例えば円筒形のシリコンゴムからなる、ばね負荷式支持体２０９、２０９が配置され、圧電セラミック２９１の他方の長辺２８７をケース２８１に押圧している。長辺２８７が押圧されたケース２８１は固定支持体２１１、２１１をなしている。ばね負荷式支持体２０９、固定支持体２１１、及び圧電セラミック２９１は摺動可能である。 Between one long side 289 of the piezoelectric ceramic 291 and the case 281, spring-loaded supports 209 and 209 made of, for example, cylindrical silicon rubber are disposed, and the other long side 287 of the piezoelectric ceramic 291 is disposed on the case. 281 is pressed. The case 281 whose long side 287 is pressed forms fixed supports 211 and 211. The spring-loaded support 209, the fixed support 211, and the piezoelectric ceramic 291 are slidable.
　圧電セラミック２９１の短辺２８５とケース２８１との間には、ばね負荷式支持体２１３が配置されており、出力端部２０を介して圧電セラミック２９１を案内軸１８の平面１８２に付勢している。付勢スイッチ２１４は、ばね負荷式支持体２１３とケース２８１との間において、ばね負荷式支持体２１３による付勢力を少なくとも２段階（つまり、オン／オフ）で調整可能な機構である。付勢スイッチ２１４は、ボルトの締め付け程度や、機械的な連結の有無の切り替え、あるいは圧電素子に対する電圧の印加により、付勢力を調整する。ケース２８１のうち開口２９３の周囲は、ばね負荷式支持体１１３によって短辺２８３が付勢された際に、圧電セラミック２９１のストッパをなしている。 A spring-loaded support 213 is disposed between the short side 285 of the piezoelectric ceramic 291 and the case 281, and biases the piezoelectric ceramic 291 against the flat surface 182 of the guide shaft 18 via the output end 20. Yes. The urging switch 214 is a mechanism that can adjust the urging force of the spring-loaded support 213 between at least two stages (that is, on / off) between the spring-loaded support 213 and the case 281. The urging switch 214 adjusts the urging force by switching the degree of tightening of bolts, switching between mechanical connection and absence, or applying a voltage to the piezoelectric element. In the case 281, the periphery of the opening 293 serves as a stopper for the piezoelectric ceramic 291 when the short side 283 is urged by the spring-loaded support 113.
　図２の（ａ）によれば、付勢スイッチ２１４がオフであるので、案内軸１８の側面のうち平面１８２と超音波モータ２の出力端部２０とが接触していない。それゆえ、超音波モータ２の出力は案内軸１８に対して伝わらない。 2A, since the urging switch 214 is off, the plane 182 and the output end 20 of the ultrasonic motor 2 are not in contact with each other on the side surface of the guide shaft 18. Therefore, the output of the ultrasonic motor 2 is not transmitted to the guide shaft 18.
　他方で、図２の（ｂ）によれば、付勢スイッチ２１４がオンであるので、案内軸１８の側面のうち平面１８２と超音波モータ２の出力端部２０とが、接触領域２１８において点接触している。それゆえ、超音波モータ２の出力が案内軸１８に対して伝わり、もってピックアップ装置用台座１４を、案内軸１８の伸長方向に沿った方向Ａ又は方向Ｂへと駆動することができる。 On the other hand, according to FIG. 2B, since the bias switch 214 is on, the plane 182 of the side surface of the guide shaft 18 and the output end 20 of the ultrasonic motor 2 are pointed in the contact region 218. In contact. Therefore, the output of the ultrasonic motor 2 is transmitted to the guide shaft 18, so that the pickup device base 14 can be driven in the direction A or the direction B along the extending direction of the guide shaft 18.
　因みに、圧電セラミック２９１の励起は、共振点付近の周波数（例えば、４０ＫＨｚ）の交流電圧やパルス電圧で行われる。ばね負荷式支持体２１３の時間的応答性は、圧電セラミック２９１の共振振動数より充分に遅くしておく。 Incidentally, excitation of the piezoelectric ceramic 291 is performed with an AC voltage or a pulse voltage having a frequency near the resonance point (for example, 40 KHz). The temporal response of the spring-loaded support 213 is sufficiently slower than the resonance frequency of the piezoelectric ceramic 291.
　次に、図３を参照して、超音波モータ２が、案内軸１８の伸長方向に沿った方向Ａ又は方向Ｂの駆動力を出力端部２０から案内軸１８に対して出力する際の動作原理について、説明する。図３は、実施例に係る超音波モータ２がピックアップ装置用台座１４を駆動する様子を示す上面図である。 Next, referring to FIG. 3, the operation when the ultrasonic motor 2 outputs the driving force in the direction A or the direction B along the extending direction of the guide shaft 18 from the output end 20 to the guide shaft 18. The principle will be described. FIG. 3 is a top view illustrating a state in which the ultrasonic motor 2 according to the embodiment drives the pickup device base 14.
　図３の（ａ）に示すように、超音波モータ２がピックアップ装置用台座１４を方向Ａへ駆動するための動作原理は以下の通りである。すなわち、電極２９９、２０１に正のパルスを加え、電極２９７、２０３に負のパルスを加えると、圧電セラミック２９１は各振動で長辺２８７が長辺２８９より長くなるように変形し、出力端部２０は楕円運動する。ここで、上記のように、ばね負荷式支持体２１３の時間的応答性は圧電セラミック２９１の共振振動数より充分に遅いから、出力端部２０はばね負荷式支持体２１３によって振動の一方向だけ案内軸１８の平面１８２に付勢され、振動の反対方向では案内軸１８の平面１８２から離れる。こうして、圧電セラミック２９１の振動が一方向の方向（図３の（ａ）の場合、方向Ｂ）の駆動力に変換される。そして、ばね負荷式支持体１１３の付勢力によって生じた摩擦力により、方向Ｂの駆動力が、超音波モータ２の出力端部２０から案内軸１８に対して出力される。この反作用により、超音波モータ２、及びピックアップ装置用台座１４が、方向Ａへと並進する。すなわち、超音波モータ２が、ピックアップ装置用台座１４を、方向Ａへ駆動する。この際、超音波モータ２は、電磁モータに較べて、低速で大きな駆動力が得られると共に、圧電セラミック２９１の駆動力が摩擦力によって案内軸１８の平面１８２に直接伝動されるから、回転を直線方向に変換するギヤ機構が不要である。 As shown in FIG. 3A, the operating principle for the ultrasonic motor 2 to drive the pickup device base 14 in the direction A is as follows. That is, when a positive pulse is applied to the electrodes 299 and 201 and a negative pulse is applied to the electrodes 297 and 203, the piezoelectric ceramic 291 is deformed so that the long side 287 is longer than the long side 289 with each vibration, and the output end portion 20 moves elliptically. Here, as described above, since the temporal response of the spring-loaded support 213 is sufficiently slower than the resonance frequency of the piezoelectric ceramic 291, the output end 20 is only oscillated in one direction by the spring-loaded support 213. It is biased by the plane 182 of the guide shaft 18 and moves away from the plane 182 of the guide shaft 18 in the opposite direction of vibration. Thus, the vibration of the piezoelectric ceramic 291 is converted into a driving force in one direction (direction B in the case of FIG. 3A). Then, the driving force in the direction B is output from the output end 20 of the ultrasonic motor 2 to the guide shaft 18 by the frictional force generated by the biasing force of the spring-loaded support 113. By this reaction, the ultrasonic motor 2 and the pickup device base 14 translate in the direction A. That is, the ultrasonic motor 2 drives the pickup device base 14 in the direction A. At this time, the ultrasonic motor 2 can obtain a large driving force at a lower speed than the electromagnetic motor, and the driving force of the piezoelectric ceramic 291 is directly transmitted to the plane 182 of the guide shaft 18 by the frictional force. A gear mechanism for converting to a linear direction is not required.
　他方で、図３の（ｂ）に示すように、超音波モータ２がピックアップ装置用台座１４を方向Ｂへ駆動するための動作原理は以下の通りである。すなわち、図３の（ａ）とは反対に、電極２９９、２０１に負のパルスを加え、電極２９７、２０３に正のパルスを加えると、圧電セラミック２９１は各振動で長辺２８７が長辺２８９より短くなるように変形し、出力端部２０は、図３の（ａ）とは反対方向に楕円運動する。あとは同様にして、圧電セラミック２９１の振動が一方向の方向（図３の（ｂ）の場合、方向Ａ）の駆動力に変換される。そして、ばね負荷式支持体１１３の付勢力によって生じた摩擦力により、方向Ａの駆動力が、超音波モータ２の出力端部２０から案内軸１８に対して出力される。この反作用により、超音波モータ２、及びピックアップ装置用台座１４が、方向Ｂへと並進する。 On the other hand, as shown in FIG. 3B, the operating principle for the ultrasonic motor 2 to drive the pickup device base 14 in the direction B is as follows. That is, when a negative pulse is applied to the electrodes 299 and 201 and a positive pulse is applied to the electrodes 297 and 203, the piezoelectric ceramic 291 has a long side 287 having a long side 289 due to each vibration. The output end 20 is deformed so as to be shorter, and elliptically moves in the direction opposite to that of FIG. Similarly, the vibration of the piezoelectric ceramic 291 is converted into a driving force in one direction (direction A in the case of FIG. 3B). Then, the driving force in the direction A is output from the output end 20 of the ultrasonic motor 2 to the guide shaft 18 by the frictional force generated by the biasing force of the spring-loaded support 113. By this reaction, the ultrasonic motor 2 and the pickup device base 14 translate in the direction B.
　以上詳述したように、図３によれば、超音波モータ２が、案内軸１８の伸長方向に沿った方向Ａ又は方向Ｂの駆動力を出力端部２０から案内軸１８に対して出力可能となる。 As described above in detail, according to FIG. 3, the ultrasonic motor 2 can output the driving force in the direction A or B along the extending direction of the guide shaft 18 from the output end 20 to the guide shaft 18. It becomes.
　続いて、図４から図６を参照して、比較例と比較しながら、実施例、及びその第１変形例の利点を詳述する。 Subsequently, the advantages of the embodiment and its first modification will be described in detail with reference to FIGS.
　図４は、比較例に係る、超音波モータ２からピックアップ装置用台座１４への振動伝動の様子を示す拡大断面図である。図４に示すように、比較例では、超音波モータ２がピックアップ装置用台座１４に内蔵されている。そのため、超音波モータ２が駆動力を出力する際に生じる振動６２が、ピックアップ装置用台座１４へ直接伝動して、振動６１４を生じてしまう。振動６２のうち特に、案内軸１８の側面に形成された平面１８２と平行であって、かつ、所定の方向Ａ又は方向Ｂに交わる方向の成分は、ピックアップ装置用台座１４を所定の方向Ａ又は方向Ｂへ駆動するためには不要な方向の成分であるにもかかわらず、平面１８２によって振動が抑制されることもない。しかも、超音波モータ２の出力端部２０が、案内軸１８に上方から接触している。そのため、ピックアップ装置用台座１４の厚さＨが不要に増大してしまう。 FIG. 4 is an enlarged cross-sectional view showing a state of vibration transmission from the ultrasonic motor 2 to the pickup device base 14 according to the comparative example. As shown in FIG. 4, in the comparative example, the ultrasonic motor 2 is built in the pickup device base 14. Therefore, the vibration 62 generated when the ultrasonic motor 2 outputs a driving force is directly transmitted to the pickup device base 14 to generate the vibration 614. In particular, a component of the vibration 62 that is parallel to the plane 182 formed on the side surface of the guide shaft 18 and intersects the predetermined direction A or direction B causes the pickup device base 14 to move in the predetermined direction A or The vibration is not suppressed by the plane 182 even though it is a component in a direction unnecessary for driving in the direction B. In addition, the output end 20 of the ultrasonic motor 2 is in contact with the guide shaft 18 from above. Therefore, the thickness H of the pickup device base 14 is unnecessarily increased.
　これに対し、図５は、実施例に係る、超音波モータ２からピックアップ装置用台座１４への振動伝動の様子を示す拡大断面図である。図５に示すように、実施例では、超音波モータ２がピックアップ装置用台座１４に内蔵されておらず、その外部で結合部１５によって結合されている。そして、結合部１５は、金属や弾性ゴム等のように比較的高弾性な結合板からなり、上記不要な方向に沿って弾性変位する。例えば、結合部１５のうち、ピックアップ装置用台座１４側での留め点７１５を支点として、超音波モータ２側が矢印７１５の方向に撓る。そのため、超音波モータ２が駆動力を出力する際に生じる振動６２は、結合部１５において吸収され、ピックアップ装置用台座１４へは殆ど伝動しない。しかも、超音波モータ２が、案内軸１８を挟んで、ピックアップ装置用台座１４と対向する位置から、案内軸１８に対して駆動力を出力するように、結合部１５によって結合されている。そうすると、ピックアップ装置用台座１４の厚さＨが、超音波モータ２のために増すことはない。 On the other hand, FIG. 5 is an enlarged sectional view showing a state of vibration transmission from the ultrasonic motor 2 to the pickup device base 14 according to the embodiment. As shown in FIG. 5, in the embodiment, the ultrasonic motor 2 is not incorporated in the pickup device base 14, and is coupled to the outside by a coupling portion 15. And the coupling | bond part 15 consists of a comparatively highly elastic coupling board like a metal, an elastic rubber, etc., and elastically displaces along the said unnecessary direction. For example, the ultrasonic motor 2 side bends in the direction of the arrow 715 with the fastening point 715 on the pickup device base 14 side in the coupling portion 15 as a fulcrum. Therefore, the vibration 62 generated when the ultrasonic motor 2 outputs the driving force is absorbed by the coupling portion 15 and hardly transmitted to the pickup device base 14. In addition, the ultrasonic motor 2 is coupled by the coupling unit 15 so as to output a driving force to the guide shaft 18 from a position facing the pickup device base 14 with the guide shaft 18 interposed therebetween. Then, the thickness H of the pickup device base 14 does not increase due to the ultrasonic motor 2.
　更に、図６は、第１変形例に係る、超音波モータ２からピックアップ装置用台座１４への振動伝動の様子を示す拡大断面図である。図６に示すように、第１変形例では、結合部１５と超音波モータ２とを、上記不要な方向に伸縮する結合弾性部５１によって留めてある。そのため、超音波モータ２が駆動力を出力する際に生じる振動６２は、結合弾性部５１の伸縮によって吸収され、ピックアップ装置用台座１４へは殆ど伝動しない。しかも、実施例と同様に、ピックアップ装置用台座１４の厚さＨが、超音波モータ２のために増すことはない。 Furthermore, FIG. 6 is an enlarged cross-sectional view showing a state of vibration transmission from the ultrasonic motor 2 to the pickup device base 14 according to the first modification. As shown in FIG. 6, in the first modification, the coupling portion 15 and the ultrasonic motor 2 are fastened by a coupling elastic portion 51 that expands and contracts in the unnecessary direction. Therefore, the vibration 62 generated when the ultrasonic motor 2 outputs the driving force is absorbed by the expansion and contraction of the coupling elastic part 51 and hardly transmitted to the pickup device base 14. Moreover, the thickness H of the pickup device base 14 does not increase due to the ultrasonic motor 2 as in the embodiment.
　以上詳述したように、図４から図６によれば、超音波モータ２がピックアップ装置用台座１４に内蔵せず、超音波モータ２の振動を結合部１５において吸収する構成としたので、超音波モータ２からピックアップ装置用台座１４のへと伝動する振動を好適に抑制可能であり、加えて、ピックアップ装置用台座１４の薄型化を可能であることが示された。 As described above in detail, according to FIGS. 4 to 6, the ultrasonic motor 2 is not built in the pickup device base 14, and the vibration of the ultrasonic motor 2 is absorbed by the coupling portion 15. It has been shown that vibration transmitted from the sonic motor 2 to the pickup device base 14 can be suitably suppressed, and in addition, the pickup device base 14 can be made thinner.
　次に、図７から図９を参照して、第１変形例に係る課題を示し、その解決手段としての第２変形例について詳述する。図７は、第１変形例に係る、超音波モータ２の振動による課題を示す拡大断面図である。 Next, with reference to FIG. 7 to FIG. 9, the problem relating to the first modification will be described, and the second modification as a solution will be described in detail. FIG. 7 is an enlarged cross-sectional view showing a problem caused by vibration of the ultrasonic motor 2 according to the first modification.
　第１変形例において、超音波モータ２が駆動力を出力する際に生じる振動６２を、結合弾性部５１の伸縮によって吸収する場合、図７に示すように、超音波モータ２が基準位置Ｚ０から矢印７５１で示す方向に上下し、その伸縮の程度によっては、平面１８２と超音波モータ２の出力端部２０との接触が解除してしまう虞がある。そうすると、超音波モータ２の出力が案内軸１８に対して伝わらず、安定した駆動を維持できないという課題が生じる。勿論、バネ定数を調整することで、かかる事態を極力回避することはできるが、一層確実に回避するべく、図８及び図９に示す第２変形例を採用してもよい。図８は、第２変形例に係る駆動装置をピックアップ装置の送り機構として用いている情報記録再生装置１を部分的に示す、拡大断面図とその斜視図である（ただし、超音波モータ２に内蔵されている圧電セラミック２９１等は省略して描いてある）。図９は、第２変形例に係る、超音波モータ２がピックアップ装置用台座１４を駆動する様子を示す上面図である（ａ：方向Ａへ駆動する場合、ｂ：方向Ｂへ駆動する場合）。 In the first modification, when the vibration 62 generated when the ultrasonic motor 2 outputs a driving force is absorbed by the expansion and contraction of the coupling elastic portion 51, the ultrasonic motor 2 is moved to the reference position Z 0 as shown in FIG. , The contact between the flat surface 182 and the output end 20 of the ultrasonic motor 2 may be released depending on the degree of expansion and contraction. As a result, the output of the ultrasonic motor 2 is not transmitted to the guide shaft 18, causing a problem that stable driving cannot be maintained. Of course, such a situation can be avoided as much as possible by adjusting the spring constant, but the second modification shown in FIGS. 8 and 9 may be employed in order to avoid it more reliably. FIG. 8 is an enlarged cross-sectional view and a perspective view thereof partially showing the information recording / reproducing apparatus 1 using the drive device according to the second modification as a feeding mechanism of the pickup device (however, the ultrasonic motor 2 includes The built-in piezoelectric ceramic 291 etc. are omitted). FIG. 9 is a top view illustrating a state in which the ultrasonic motor 2 drives the pickup device base 14 according to the second modification (a: when driving in the direction A, b: when driving in the direction B). .
　図８に示すように、第２変形例において、超音波モータ２は、開口２９３の近傍に軸受け２８１２、２８１３を備え、そこには案内軸１８を貫通させる孔２８２２、２８２３が形成されている。そして、該孔２８２２、２８２３の、結合弾性部５１が弾性変位する方向（矢印７５１で示す方向）における長さは、案内軸１８に形成された平面１８２のそれ以上である。そうすると、その矢印７５１で示す方向において結合弾性部５１が弾性変位する余裕が幾らか残されていることになり、超音波モータ２が駆動力を出力する際に生じる振動６２を、好適に吸収できる。加えて、該孔２８２２、２８２３の、結合弾性部５１が弾性変位する方向（矢印７５１で示す方向）における長さは、結合弾性部５１が弾性変位する際に、案内軸１８に形成された平面１８２と超音波モータ２の出力端部２０との接触状態が維持される範囲である。これにより、超音波モータ２による安定した駆動を維持可能である。 As shown in FIG. 8, in the second modification, the ultrasonic motor 2 includes bearings 2812 and 2813 in the vicinity of the opening 293, and holes 2822 and 2823 that allow the guide shaft 18 to pass therethrough. The lengths of the holes 2822 and 2823 in the direction in which the coupling elastic portion 51 is elastically displaced (the direction indicated by the arrow 751) are longer than the plane 182 formed on the guide shaft 18. This leaves some room for elastic displacement of the coupling elastic part 51 in the direction indicated by the arrow 751 and can suitably absorb the vibration 62 generated when the ultrasonic motor 2 outputs the driving force. . In addition, the lengths of the holes 2822 and 2823 in the direction in which the coupling elastic portion 51 is elastically displaced (the direction indicated by the arrow 751) are the planes formed on the guide shaft 18 when the coupling elastic portion 51 is elastically displaced. This is a range in which the contact state between 182 and the output end 20 of the ultrasonic motor 2 is maintained. Thereby, the stable drive by the ultrasonic motor 2 can be maintained.
　以上詳述したように、図７から図９によれば、超音波モータ２が駆動力を出力する際に生じる振動６２を、好適に吸収し、かつ安定した駆動を維持可能であることが示された。 As described above in detail, FIGS. 7 to 9 show that the vibration 62 generated when the ultrasonic motor 2 outputs the driving force can be suitably absorbed and stable driving can be maintained. It was done.
　尚、上述した実施例において、
「ピックアップ装置用台座１４」が、本発明に係る「駆動対象物」の一例であり、
「基板１１」が、本発明に係る「基板」の一例であり、
「案内軸１８」が、本発明に係る「案内軸」の一例であり、
「方向Ａ」及び「方向Ｂ」が、本発明に係る「案内軸の伸長方向に沿った方向」の一例であり、
「平面１８２」が、本発明に係る「案内軸の側面」の一例であり、かつ、本発明に係る「案内軸の伸長方向に沿って」形成される「平面」の一例であり、
「超音波モータ２」が、本発明に係る「出力手段」の一例であり、
「出力端部２０」が、本発明に係る「出力端部」の一例であり、
「結合部１５」、及び「結合弾性部５１」が、本発明に係る「結合手段」の一例であり、
「軸受け部２８１２」及び「軸受け部２８１３」が、本発明に係る出力手段が備える「軸受け」の一例であり、
「負荷式支持体２１３」が、本発明に係る「付勢手段」の一例である。 In the embodiment described above,
The “pickup device base 14” is an example of the “driving object” according to the present invention,
“Substrate 11” is an example of the “substrate” according to the present invention,
The “guide shaft 18” is an example of the “guide shaft” according to the present invention,
"Direction A" and "Direction B" are examples of "the direction along the extension direction of the guide shaft" according to the present invention,
The “plane 182” is an example of the “side surface of the guide shaft” according to the present invention, and is an example of the “plane” formed along the extension direction of the guide shaft according to the present invention,
"Ultrasonic motor 2" is an example of "output means" according to the present invention,
"Output end 20" is an example of "output end" according to the present invention,
“Coupling portion 15” and “coupling elastic portion 51” are examples of “coupling means” according to the present invention,
"Bearing part 2812" and "bearing part 2813" are examples of "bearings" provided in the output means according to the present invention,
The “load type support body 213” is an example of the “biasing means” according to the present invention.
　尚、本発明は、上述した実施例に限られるものではなく、請求の範囲及び明細書全体から読み取れる発明の要旨、或いは思想に反しない範囲で適宜変更可能であり、そのような変更を伴うもまた、本発明の技術的範囲に含まれるものである。 It should be noted that the present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit or idea of the invention that can be read from the claims and the entire specification, and is accompanied by such changes. Moreover, it is included in the technical scope of the present invention.
　本発明は、例えば光ピックアップその他の駆動対象物を案内軸の伸長方向に沿って駆動する、超音波モータを用いた駆動装置の技術分野に利用可能である。 The present invention can be used in the technical field of a drive device using an ultrasonic motor that drives, for example, an optical pickup or other drive target along the extension direction of the guide shaft.

Claims (8)

  1. 　駆動対象物を所定の方向へ駆動する駆動装置であって、
    　基板に固定されており、前記所定の方向に伸長している案内軸と、
    　前記案内軸の伸長方向に沿った方向の駆動力を出力端部から前記案内軸に対して出力するとともに、前記駆動対象物に結合されることで該駆動対象物と並進する出力手段と、
    　前記出力手段が、前記案内軸を挟んで、前記駆動対象物と対向する位置から、前記駆動力を前記案内軸に対して出力するように、前記駆動対象物と前記出力手段とを結合する結合手段とを備える
    　ことを特徴とする駆動装置。     A driving device for driving a driving object in a predetermined direction,
    A guide shaft fixed to the substrate and extending in the predetermined direction;
    An output means for outputting a driving force in a direction along the extending direction of the guide shaft from the output end to the guide shaft, and being translated to the drive object by being coupled to the drive object;
    Coupling that couples the drive object and the output means so that the output means outputs the drive force to the guide shaft from a position facing the drive object across the guide shaft. And a driving device.
  2. 　前記結合手段は、前記出力手段が前記駆動力を出力する際に生じる振動のうち、前記駆動対象物を前記所定の方向へ駆動するためには不要な方向の成分を低減する
    　ことを特徴とする請求の範囲第１項に記載の駆動装置。     The coupling means reduces a component in a direction unnecessary for driving the driving object in the predetermined direction among vibrations generated when the output means outputs the driving force. The drive device according to claim 1.
  3. 　前記案内軸の側面のうち少なくとも一部には、前記案内軸の伸長方向に沿って平面が形成されており、
    　前記出力手段は、前記案内軸の側面に形成された平面に対して、前記駆動力を出力し、
    　前記結合手段は、前記出力手段が前記駆動力を出力する際に生じる振動のうち、前記駆動対象物を前記所定の方向へ駆動するためには不要な方向の成分として、前記案内軸の側面に形成された平面と平行であって、かつ、前記所定の方向に交わる方向の成分を低減する
    　ことを特徴とする請求の範囲第２項に記載の駆動装置。     A flat surface is formed along at least a part of the side surface of the guide shaft along the extending direction of the guide shaft,
    The output means outputs the driving force to a plane formed on a side surface of the guide shaft;
    The coupling means is arranged on a side surface of the guide shaft as a component in a direction unnecessary for driving the driving object in the predetermined direction among vibrations generated when the output means outputs the driving force. The drive device according to claim 2, wherein a component in a direction parallel to the formed plane and intersecting the predetermined direction is reduced.
  4. 　前記結合手段は、前記駆動対象物を前記所定の方向へ駆動するためには不要な方向に沿って弾性変位する
    　ことを特徴とする請求の範囲第２項に記載の駆動装置。     The driving apparatus according to claim 2, wherein the coupling means elastically displaces along a direction unnecessary for driving the driving object in the predetermined direction.
  5. 　前記出力手段、および前記駆動対象物は前記案内軸の軸受けを個別に備える
    　ことを特徴とする請求の範囲第４項に記載の駆動装置。     The driving device according to claim 4, wherein the output means and the driving object individually include bearings of the guide shaft.
  6. 　前記出力手段が備える軸受けには前記案内軸を貫通させる孔が形成されており、該孔の、前記結合手段が弾性変位する方向における長さは、前記案内軸の断面のそれ以上であり、かつ、前記結合手段が弾性変位する際に前記案内軸の側面と前記出力手段の出力端部との接触状態が維持される範囲である
    　ことを特徴とする請求の範囲第５項に記載の駆動装置。     A hole for penetrating the guide shaft is formed in the bearing provided in the output means, and the length of the hole in the direction in which the coupling means is elastically displaced is longer than the cross section of the guide shaft, and 6. The driving device according to claim 5, wherein the contact state between the side surface of the guide shaft and the output end of the output means is maintained when the coupling means is elastically displaced. .
  7. 　前記出力手段を、前記案内軸の側面に対して付勢する付勢手段を更に備える
    　ことを特徴とする請求の範囲第１項に記載の駆動装置。     The drive device according to claim 1, further comprising a biasing unit that biases the output unit with respect to a side surface of the guide shaft.
  8. 　前記出力手段が超音波モータであり、
    　前記駆動対象物がピックアップ装置であり、
    　前記駆動装置をピックアップ装置の送り機構として用いる
    　ことを特徴とする情報記録再生装置。     The output means is an ultrasonic motor;
    The driving object is a pickup device;
    An information recording / reproducing apparatus, wherein the driving device is used as a feeding mechanism of a pickup device.
PCT/JP2008/054475 2008-03-12 2008-03-12 Moving apparatus WO2009113163A1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2458758B (en) * 2008-03-06 2013-05-01 Nanomotion Ltd Apparatus for moving a body between a first position and a second position

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0260963U (en) * 1988-10-25 1990-05-07
JPH11102579A (en) * 1997-09-26 1999-04-13 Kenwood Corp Head feed mechanism of optical disk apparatus
WO2007069682A1 (en) * 2005-12-15 2007-06-21 Matsushita Electric Industrial Co., Ltd. Ultrasonic actuator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0260963U (en) * 1988-10-25 1990-05-07
JPH11102579A (en) * 1997-09-26 1999-04-13 Kenwood Corp Head feed mechanism of optical disk apparatus
WO2007069682A1 (en) * 2005-12-15 2007-06-21 Matsushita Electric Industrial Co., Ltd. Ultrasonic actuator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2458758B (en) * 2008-03-06 2013-05-01 Nanomotion Ltd Apparatus for moving a body between a first position and a second position

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