WO2005116998A1 - レンズ駆動装置および光ピックアップ装置 - Google Patents
レンズ駆動装置および光ピックアップ装置 Download PDFInfo
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- WO2005116998A1 WO2005116998A1 PCT/JP2005/009823 JP2005009823W WO2005116998A1 WO 2005116998 A1 WO2005116998 A1 WO 2005116998A1 JP 2005009823 W JP2005009823 W JP 2005009823W WO 2005116998 A1 WO2005116998 A1 WO 2005116998A1
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- lens
- film
- driving
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- fixed
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- 230000003287 optical effect Effects 0.000 title claims abstract description 48
- 229920001940 conductive polymer Polymers 0.000 claims abstract description 46
- 150000002500 ions Chemical class 0.000 claims description 60
- 239000002019 doping agent Substances 0.000 claims description 31
- 239000002861 polymer material Substances 0.000 claims description 30
- 230000004075 alteration Effects 0.000 claims description 27
- 238000006073 displacement reaction Methods 0.000 claims description 18
- 230000005540 biological transmission Effects 0.000 claims description 16
- 239000011245 gel electrolyte Substances 0.000 claims description 15
- 230000004807 localization Effects 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 8
- 239000007784 solid electrolyte Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 2
- 238000005452 bending Methods 0.000 claims 6
- 230000007246 mechanism Effects 0.000 abstract description 10
- 229920006254 polymer film Polymers 0.000 description 76
- 229920000642 polymer Polymers 0.000 description 67
- 238000010586 diagram Methods 0.000 description 14
- 238000005304 joining Methods 0.000 description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
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- 239000010419 fine particle Substances 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 6
- 239000008151 electrolyte solution Substances 0.000 description 5
- 239000004065 semiconductor Substances 0.000 description 5
- 230000008602 contraction Effects 0.000 description 4
- 238000010030 laminating Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- -1 1-butyl-3-methylimidazolium tetrafluoroborate Chemical compound 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- IQQRAVYLUAZUGX-UHFFFAOYSA-N 1-butyl-3-methylimidazolium Chemical compound CCCCN1C=C[N+](C)=C1 IQQRAVYLUAZUGX-UHFFFAOYSA-N 0.000 description 1
- RABBMOYULJIAFU-UHFFFAOYSA-N 1h-pyrrole;thiophene Chemical group C=1C=CNC=1.C=1C=CSC=1 RABBMOYULJIAFU-UHFFFAOYSA-N 0.000 description 1
- QGHDLJAZIIFENW-UHFFFAOYSA-N 4-[1,1,1,3,3,3-hexafluoro-2-(4-hydroxy-3-prop-2-enylphenyl)propan-2-yl]-2-prop-2-enylphenol Chemical group C1=C(CC=C)C(O)=CC=C1C(C(F)(F)F)(C(F)(F)F)C1=CC=C(O)C(CC=C)=C1 QGHDLJAZIIFENW-UHFFFAOYSA-N 0.000 description 1
- XMWRBQBLMFGWIX-UHFFFAOYSA-N C60 fullerene Chemical compound C12=C3C(C4=C56)=C7C8=C5C5=C9C%10=C6C6=C4C1=C1C4=C6C6=C%10C%10=C9C9=C%11C5=C8C5=C8C7=C3C3=C7C2=C1C1=C2C4=C6C4=C%10C6=C9C9=C%11C5=C5C8=C3C3=C7C1=C1C2=C4C6=C2C9=C5C3=C12 XMWRBQBLMFGWIX-UHFFFAOYSA-N 0.000 description 1
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- 240000009038 Viola odorata Species 0.000 description 1
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- 235000002254 Viola papilionacea Nutrition 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229920001222 biopolymer Polymers 0.000 description 1
- LRESCJAINPKJTO-UHFFFAOYSA-N bis(trifluoromethylsulfonyl)azanide;1-ethyl-3-methylimidazol-3-ium Chemical compound CCN1C=C[N+](C)=C1.FC(F)(F)S(=O)(=O)[N-]S(=O)(=O)C(F)(F)F LRESCJAINPKJTO-UHFFFAOYSA-N 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
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- 229910003472 fullerene Inorganic materials 0.000 description 1
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- 229920002521 macromolecule Polymers 0.000 description 1
- 125000004170 methylsulfonyl group Chemical group [H]C([H])([H])S(*)(=O)=O 0.000 description 1
- 239000002052 molecular layer Substances 0.000 description 1
- 125000001280 n-hexyl group Chemical group C(CCCCC)* 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 229920000128 polypyrrole Polymers 0.000 description 1
- 229920000123 polythiophene Polymers 0.000 description 1
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- ITMCEJHCFYSIIV-UHFFFAOYSA-M triflate Chemical compound [O-]S(=O)(=O)C(F)(F)F ITMCEJHCFYSIIV-UHFFFAOYSA-M 0.000 description 1
Classifications
-
- 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
- Patent application title Lens driving device and optical pickup device
- the present invention relates to a lens driving device and an optical pickup device, and is particularly suitable for use in aberration correction or tilt correction.
- Wavefront aberrations such as spherical aberration occur on convergent light converged on the disk from the optical pickup device due to a disk thickness error, a wavelength variation of the semiconductor laser, or the like. This problem becomes more prominent as the wavelength of laser light used advances, such as the next-generation DVD (Digital Versatile Disc) using blue-violet laser light.
- next-generation DVD Digital Versatile Disc
- an aberration correction lens is disposed in an optical path from a semiconductor laser to an objective lens, and this lens is driven in the optical axis direction by a motor. Further, in Patent Document 2, such an aberration correcting lens is driven by a voice coil driving actuator composed of a coil and a magnet.
- Aberration correction can be performed by driving and controlling the aberration correction lens so as to cancel out the difference of the convergent light on the disk.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2000-913-1847
- Patent Document 2 Japanese Patent Application Laid-Open No. 2003-166660
- the present invention provides a lens driving device and an optical pickup device that have a very simple configuration of a driving mechanism, have no fear of generating heat, and can realize low vibration, low power consumption, and low noise.
- the task is to
- the most important feature of the present invention is that a lens is driven by using a structure whose shape and dimensions change when a voltage is applied as a drive source.
- a structure in which the shape and dimensions are displaced when a dopant ion enters and exits a conductive polymer material by application of a servo voltage, and the displacement of the shape and dimensions of the structure is used as a driving force for the lens support means.
- Transmission means for transmitting for transmitting.
- a structure which is deformed by electric attraction or repulsion generated by the movement and localization of ions by application of a servo voltage, and the deformation of the structure is transmitted to a lens supporting means as a driving force.
- Transmission means for transmitting for transmitting.
- the first and second inventions are applied to a lens driving device or an optical pickup device incorporating the same.
- the structure can be constituted by a film-like structure whose dimension in the plane direction is displaced, a film-like structure that is curved in a direction perpendicular to the plane, or a structure whose dimension in the longitudinal direction is displaced.
- the “structure” in the present invention is indicated as “polymer film” in the embodiment.
- an actuator such as a motor, a lead screw, a coil, or a magnet is not required, and a lens driving mechanism is used. 'Simple' simple be able to.
- this structure since this structure hardly generates heat or mechanical vibration, there is no problem that the characteristics of the pick-up device are deteriorated by heat or vibration from the driving means. Further, since this structure consumes less power and generates almost no noise during driving, it is possible to reduce the power consumption and noise of the lens driving device.
- a polymer film (a volume-change type polymer film) whose shape and dimensions are displaced by a volume change caused by entry and exit of dopant ions, and electricity generated by movement and localization of ions.
- a polymer film an electric force type polymer film
- an electric force type polymer film that is deformed by the attractive or repulsive force is used as a driving source.
- Figure 1 shows the cross-sectional structure of a strong polymer film.
- the polymer film has a structure in which a solid electrolyte layer, a conductive polymer material A, and a conductive polymer material B are laminated.
- the planar shape of the polymer film is a long and narrow rectangle whose longitudinal direction is the horizontal direction (the direction of the arrow on the pattern (1)).
- macromolecules are formed by polymerizing monomer molecules with each other to form long chains of molecules.
- the monomer molecule has a property that electrons can be transferred between adjacent molecules during polymerization, the polymer after generation becomes a conductive polymer, that is, the polymer body becomes conductive. Will be provided.
- this conductivity is semiconductor Is close to the conductivity.
- a typical monomer molecule suitable for forming a conductive polymer is pyrrole-thiophene. When these polymerize, they become polypyrrole and polythiophene.
- the conductive polymer itself has p-type or n-type characteristics depending on the polarity of the ion species.
- the conductive polymer is immersed in the electrolyte solution, and for example, if the potential is applied with the electrolyte solution side being negative and the conductive high molecular layer side being positive, if the incorporated dopant ions have positive polarity, The dopant ions go out into the electrolyte solution. When a potential opposite to this is applied, dopant ions are taken into the conductive polymer. When the dopant ion has a negative polarity, the opposite behavior is exhibited.
- the amount of ions entering and exiting the conductive polymer is determined by the applied potential difference.
- the amount (number, or charge amount) of the incorporated ions in the conductive polymer is uniquely determined so as to be in an electrochemically equilibrium state with the predetermined potential. If the application of potential is interrupted while ions are taken in (or go out), ions do not substantially enter and exit between the conductive polymer and the electrolyte solution. .
- the dopant ions when the dopant ions are incorporated during the polymerization as described above, a pocket of ions (having the opposite polarity to the dopant ions) secured by the dopant ions is formed in the conductive polymer material itself. Is done.
- the dopant ions incorporated into the conductive polymer have various sizes. By appropriately selecting the size, it is possible to control the physical penetration speed into the conductive polymer.
- the “conductive polymer material A” and “conductive polymer material B” shown in FIG. 1 are materials having pockets of dopant ions of opposite polarity. Therefore, the same potential was applied to these two materials In one case, one will increase in volume and the other will decrease in volume. Therefore, when a flexible polymer film is formed by arranging these two material layers in the laminating direction, the polymer film bends in the direction of reduced volume.
- the polymer film shown in FIG. 1 is configured by utilizing the properties of the conductive polymer.
- a solid electrolyte layer is used instead of the electrolyte solution described above.
- the pattern of (4) is similar to the pattern of (1), but differs from the polymer film of (1) in that the vertical displacement is not physically regulated.
- the entire polymer film is deformed (curved) into an arc shape, whereby the center of the polymer film is moved up and down (pattern (4)). (In the direction of the arrow above).
- the pattern of (6) has conductive high molecular material layers A and B having pockets of dopant ions of opposite polarities arranged in the stacking direction.
- the polymer film of this pattern is not physically restricted in vertical displacement.
- the entire polymer film is deformed (curved) into an arc shape in the same manner as in the pattern (4) above, so that the polymer film has a central portion similar to the pattern in (4). It is displaced vertically (in the direction of the arrow on pattern (4)).
- the conductive polymer material layers A and B are simultaneously deformed into an arc shape. Large displacement can be obtained.
- the pattern (7) is formed by alternately arranging conductive polymer material layers A and B having pockets of dopant ions of opposite polarities. Like the patterns (4), (5), and (6), the polymer film of this pattern is not physically restricted in vertical displacement. In this case, when the same potential is applied to the conductive polymer material layers A and B, the polymer film as a whole is deformed into a bellows-like shape (corrugated shape shown on the pattern (7) in Fig. 1). . As a result, the polymer film expands and contracts in the longitudinal direction and the vertical direction.
- FIG. 1 shows, in addition to the configuration of the polymer film, a circuit configuration for applying a potential to each layer.
- the applied potential By increasing or decreasing the applied potential, the amount of dopant ions taken into or released from each layer changes, and the displacement of the polymer film changes accordingly.
- the magnitude of the applied potential is adjusted to change the amount of displacement of the polymer film, thereby adjusting the amount of driving of the lens.
- the laminated structure using a conductive polymer material and its manufacturing process are described in, for example, JP-A-2003-340982 and JP-A-2004-0882. It is also described in the 239 bulletin.
- FIG. 2 shows a cross-sectional structure of such a polymer film.
- the polymer film has a structure in which a gel electrode layer and a gel electrolyte layer are laminated.
- the planar shape of the polymer film is a slender rectangle whose longitudinal direction is the horizontal direction in FIG.
- a gel is an elastic polymer having a large network structure of polymer chains.
- liquid molecules and the like can be held in the network structure of the polymer chains.
- the ion-containing gel in which the ion is stably retained in the gel becomes a gel electrolyte.
- carbon-based fine particles, which are conductive fine particles into the polymer network structure of the gel electrolyte, the gel electrolyte becomes a gel electrode, that is, the gel itself is a conductive material like an electrode. Will have the property.
- a typical polymer suitable for forming a gel electrolyte or a gel electrode there is a polypyridylfluoridehexafluoropropylene copolymer.
- ions contained in the polymer ionic liquids that are stable at normal temperature and normal pressure are suitable.
- Representative examples thereof include 1-butyl-3-methylimidazolium tetrafluoroborate and 1-Ethyl-1-3-Methylimidazolym Tetrafluoroborate, 1-Hexyl 3-Methylimidazolymtetrafluoroborate, 1-Ethyl-3-Methylimidazolium bis (trifluoromethylsulfonyl) imide , 1-butyl-3-methylimidazolium Liu Mubisu (triflate Ruo b methylsulfonyl) imide and, 1- (4 Akuriroi Noreokishibuchiru) - 3-methyl-imidazo Riu to arm hexa fluoro phosphate is c further conductive to gel electrolyte Carbon nanotubes, graphite, and fullerene are carbon-based fine particles suitable for application. That.
- the laminated structure of the polymer film shown in FIG. 2 is created by repeating casting and drying in the order of gel electrode, gel electrolyte, and gel electrode. A voltage is applied to both gel electrode layers.
- the polymer film shown in FIG. 2 is constructed by utilizing the properties of a strong gel electrode layer.
- the entire polymer film is deformed (curved) into an arc shape in accordance with the expansion and contraction of each gel electrode layer, and as a result, the polymer The center of the film is displaced vertically (in the direction of the arrow on pattern (1)).
- the pattern (2) is formed by dividing the gel electrode layers on the upper and lower surfaces into two parts and wiring them so as to apply a reverse polarity potential.
- a potential when a potential is applied, the polymer film as a whole is deformed into a bellows-like shape (corrugated shape on the pattern (2)). As a result, the polymer film expands and contracts in the longitudinal direction and the vertical direction.
- FIG. 2 shows a circuit configuration for applying a potential to each layer in addition to the configuration of the polymer film.
- the applied potential is increased or decreased, the amount of displacement of the polymer film changes accordingly.
- the amount of displacement of the polymer film is changed by adjusting the magnitude of the applied potential, and thereby the amount of driving of the lens is adjusted.
- the manufacturing process of the laminated structure consisting of the gel electrode layer and the gel electrolyte layer and the manufacturing process of the material are described in, for example, The Society of Instrument and Control Engineers, 5th System Integration Division, 6 5 7-6 58 Oops Sciense 3 0 0, 2 0 7 2 (2 0 3).
- FIG. 3 shows the configuration of the polymer actuator (cylinder type) used in this embodiment.
- the polymer actuator 100 includes a polymer film 101, a cylinder 102, a sliding member 103, and a cylinder cap 104.
- the polymer film 101 is a polymer film whose external dimensions in the longitudinal direction change when a potential is applied.
- the polymer film having the pattern (7) shown in FIG. 1 or the polymer film having the pattern (2) shown in FIG. 2 is used.
- Joining jigs are arranged at both ends of the polymer film 101 to be pressed.
- the joining jig on the cylinder 102 side serves as a potential supply terminal for supplying potential to the conductive polymer material layer and the solid electrolyte layer in the polymer film of the pattern (7) in FIG.
- the polymer film of pattern (2) in FIG. 2 also functions as a potential supply terminal for supplying a potential to one of the gel electrode layers on both sides.
- the cylinder 102 is composed of a cylindrical tube and a bottom lid for closing the bottom of the cylinder. Of these, a bonding jig (potential supply) disposed at the end of the polymer film 101 is attached to the bottom lid. The joint (terminal) to which the terminal is joined is arranged.
- the sliding member 103 is formed of a circular plate having a predetermined thickness. A back surface of the sliding member 103 is provided with a bonding member disposed at an end of the polymer film 101. A joint (not shown) to which the jig is joined is provided, and a columnar movable portion 103a is formed on the upper surface side. Note that the outer diameter of the sliding member 103 is slightly smaller than the inner diameter of the cylinder 102.
- the cylinder cap 104 is a cap that closes the upper part of the cylinder 102, and has a bearing 104a into which the movable part 103 is inserted.
- a joining jig (potential supply terminal) arranged at one end of the polymer film 101 is connected to a joining portion (end) arranged at the bottom lid of the cylinder 102. And a joining jig arranged on the other end is joined to a joint arranged on the back surface of the sliding member 103. Then, after the bottom lid is fixed to the bottom of the cylinder of the cylinder 102, the sliding member 103 is housed in the cylinder 102, and the movable part 103 is attached to the bearing 104a. ⁇ ⁇ While inserting, fix the cylinder cap 104 to the top of the cylinder 102.
- FIGS. 4 and 5 show the structure of the polymer actuator 100 assembled in this manner.
- FIG. 4 shows the configuration when the polymer film of the pattern (7) shown in FIG. 1 is used
- FIG. 5 shows the configuration when the polymer film of the pattern (2) shown in FIG. 2 is used. It is.
- the polymer film 101 accommodated in the cylinder 102 has a force corresponding to the magnitude of the applied potential. Scale to dimensions.
- the sliding member 103 is displaced in the cylinder 102 while being guided by the bearing 104a, and the movable portion 103a formed on the upper surface thereof is driven upward and downward.
- FIGS. 6 to 8 show a configuration example of a lens driving device using the polymer actuator 100 as a driving source.
- the lens driving device drives an aberration correcting lens disposed in the optical pickup device.
- FIG. 6 is a diagram (exploded perspective view) showing a main configuration of the lens driving device.
- a lens holder 2 for holding and driving the movable lens 301 out of a pair of aberration correcting lenses (movable lens 301 and fixed lens 302). 0 1 is prepared.
- An opening is formed in the lens holder 201, and the movable lens 301 is mounted in the opening.
- a hole 202 is formed in the lens holder 201, and the movable portion 103a of the polymer actuator 100 is fitted and fixed in the hole 202.
- a guide groove 203 is formed at an end portion of the lens holder 201, and the guide shaft 204 is inserted into the guide groove 203 so that the lens holder 201 has a lower force. Moving direction to guide shaft 104a Is displaceably supported.
- FIG. 7 is a diagram showing a state where the members shown in FIG. 6 are assembled.
- one of the movable lens 301 and the fixed lens 302 is a concave lens, and the other is a convex lens. Therefore, when the distance between the two lenses changes due to the driving of the polymer actuator 100, the spread angle of the laser beam after passing through these two lenses changes according to the change in the distance.
- FIG. 8 shows a state in which the lens driving device is mounted on the housing 400 of the optical pickup device.
- the polymer actuator 100 is mounted on a cylinder mounting portion 401 arranged in a recess of the housing 400, and the guide shaft 204 is arranged on a guide shaft arranged in the recess.
- the fixed lens 302 is mounted in the recess of the housing 400 so as to face the movable lens 301.
- a semiconductor laser 303, a beam splitter 304, a mirror 305, a converging lens 300, and a substrate 3 ⁇ 7 holding a photodetector are mounted in the recess of the housing 400.
- an objective lens driving actuator (not shown) for driving the objective lens in the focusing direction and the tracking direction is mounted.
- the spread angle is adjusted by the fixed lens 302 and the movable lens 301. Thereafter, the light is reflected upward by the mirror 305 and converged on the disk by the objective lens of an objective lens driving actuator (not shown). The laser light reflected from the disk travels backward in the optical path and enters the beam splitter 304. The light reflected by the beam splitter 304 is converged by a converging lens 303 on a photodetector provided on a substrate 307.
- a servo signal (potential signal) for aberration correction is applied to the polymer actuator 100, and the movable lens 301 is displaced in the optical axis direction.
- the spread angle of the laser light incident on the objective lens is changed, and the aberration of the converged light on the disk is corrected.
- the use of the polymer actuator 100 as a drive source eliminates the need for a large-scale actuator such as a motor, a lead screw, a coil, and a magnet, and as shown in FIG.
- the mechanism can have a very simple configuration.
- the polymer film accommodated in the polymer actuator 100 hardly generates heat or mechanical vibration, there is a problem that the characteristics of the pick-up device deteriorate due to heat or vibration from a driving source.
- this polymer film has low power consumption and generates almost no noise when it is driven. Therefore, it is necessary to reduce the power consumption and noise of the lens driving device or optical pickup device. Can be.
- FIG. 9 shows a main configuration of a lens driving device according to the present embodiment.
- the lens driving device according to the present embodiment drives the aberration correcting lens disposed in the optical pickup device, as in the first embodiment.
- a film type polymer actuator 110 is used as a driving source.
- the polymer actuator 110 is made of a polymer film whose only external dimension changes in the longitudinal direction when a potential is applied.
- the patterns shown in FIG. 1 the patterns (1) to (3) ) Can be used.
- the polymer filters of patterns (2) and (3) When a system is used, the expansion / contraction stroke is large according to the fluctuation of the applied potential, which is advantageous in achieving a high response of the servo operation.
- a joining terminal 111 for supplying a potential to the high molecular material layer and the solid electrolyte layer of the polymer film is provided.
- a lens holder 211 for holding and driving the movable lens 301 is prepared.
- the bottom surface of the lens holder 211 is fixed to the upper surface of the polymer actuator 110.
- An opening is formed near the center of the lens holder 211, and a movable lens 301 is mounted in the opening.
- the lens holder 2 11 is formed with two holes 2 12 in a diagonal direction.
- the guide shaft 2 13 is inserted into each of the holes 2 1 2 so that the lens holder 2 1 1 force Supported to be displaceable in the direction of the arrow in the figure.
- FIG. 10 shows a state in which the lens driving device is mounted on the housing 400 of the optical pickup device.
- a stepped film mounting portion 411 which is open on the side is disposed in the concave portion of the housing 400.
- a joining terminal for electrically joining with a joining terminal 111 provided at an end of the polymer actuator 110 is provided in the film mounting portion 4111.
- the joining terminal 111 is inserted into the film mounting portion 4111 from its open side, and is bonded and fixed to the film mounting portion 4111.
- the guide shaft 2 13 is inserted into the hole 2 12 of the lens holder 2 1 1, and is mounted on the guide shaft mounting section 4 1 2 arranged in the concave portion. Further, the fixed lens 302 is mounted in a recess of the housing 400 so as to face the movable lens 301.
- Other configurations are the same as those in FIG. 8 in the first embodiment. In the state shown in the figure, when a voltage is applied to the polymer actuator 110 to expand and contract the polymer actuator 110 in the longitudinal direction, the lens holder 211 is guided by the guide shaft 211. Displaced.
- the movable lens 301 is displaced in the optical axis direction, and the distance between the movable lens 301 and the fixed lens 302 changes.
- one of the movable lens 301 and the fixed lens 302 is a concave lens, and the other is a convex lens. Therefore, when the distance between the two lenses fluctuates in this manner, the two lenses pass through the two lenses.
- the divergence angle of the laser beam after the change is changed according to the distance variation.
- a servo signal (potential signal) for aberration correction is applied to the polymer actuator 110, and the movable lens 301 is displaced in the optical axis direction. As a result, the spread angle of the laser light incident on the objective lens is changed, and the aberration of the converged light on the disk is corrected.
- the lens driving mechanism can have a very simple configuration.
- the characteristics of the pickup device are deteriorated due to heat or vibration from the driving source, and further, low power consumption and low noise can be achieved.
- FIG. 11 shows a main configuration of a lens driving device according to the present embodiment.
- the lens driving device according to the present embodiment drives the differential correction lens disposed in the optical pickup device as in the first and second embodiments.
- a film type polymer actuator 120 is used as a driving source.
- the polymer actuator 120 is composed of a polymer film that is entirely deformed (curved) in an arc shape in a direction perpendicular to the film surface when a potential is applied, and the pattern (4) shown in FIG. Or the polymer film of pattern (6) or the polymer film of pattern (1) shown in FIG.
- the displacement stroke is large in accordance with the fluctuation of the applied potential, which is advantageous in achieving a high response of the servo operation.
- a joining terminal 121 is provided at one end of the polymer actuator 120.
- a potential is supplied to the conductive polymer material layer and the solid electrolyte layer of the polymer film via the joint terminal 122.
- an electric potential is supplied to the gel electrolyte layer and the gel electrode layer of the polymer film via the bonding terminal 121.
- the polymer actuator 120 has a stepwise wide central portion, and an opening for guiding light to the movable lens 301 is formed in the wide portion 122.
- a lens holder 221 for holding and driving the movable lens 301 is prepared.
- the side surface of the lens holder 222 is fixed to the side surface of the wide portion 122 of the polymer actuator 120.
- the lens holder 222 has an opening near the center thereof, and the movable lens 301 is mounted in this opening.
- the lens holder 211 has two diagonal holes 222 formed therein, and the guide shaft 222 is inserted into each of the holes 222 so that the lens holder 211 is formed.
- 2 2 1 Force Supported to be displaceable in the direction of the arrow in the figure.
- FIG. 12 shows a state where the lens driving device is mounted on the housing 400 of the optical pickup device.
- a pair of film mounting portions 421 are arranged in a concave portion of the housing 400.
- a bonding terminal electrically connected to a bonding terminal 121 provided at an end of the polymer actuator 120 is provided in the groove of one of the film mounting portions 421.
- the polymer actuator 120 is fixed to the film mounting portion 411 with both side ends inserted into the grooves of the film mounting portion 4 21.
- the guide shaft 2 2 3 can be attached to the lens holder as described with reference to FIG. 11 above. It is inserted into the hole 221 of the 221 and is mounted to the guide shaft mounting portion 422 arranged in the concave portion. Further, the fixed lens 302 is mounted in the recess of the housing 400 so as to face the movable lens 301. Other configurations are the same as those in FIG. 8 in the first embodiment.
- a servo signal (potential signal) for aberration correction is applied to the polymer actuator 120, and the movable lens 301 is displaced in the optical axis direction.
- the spread angle of the laser light incident on the objective lens is changed, and the aberration of the converged light on the disk is corrected.
- the lens driving mechanism can have an extremely simple configuration as in the first and second embodiments.
- the lens driving devices according to the first to third embodiments drive the aberration correcting lens provided in the optical pickup device
- the lens driving device according to the present embodiment moves the objective lens in the tilt direction. Is driven.
- FIG. 13 shows a configuration example of a lens driving device according to the present embodiment.
- a pair of polymer actuators 130 are arranged so as to be parallel to each other, and an objective lens driving actuator 500 is mounted on the polymer actuators 130. It is attached in the state that it was.
- the polymer actuator 130 is composed of a polymer film which is entirely deformed (curved) in an arc shape in a direction perpendicular to the film surface when an electric potential is applied, and the pattern shown in FIG.
- the polymer film of any of 4) to (6) or the polymer film of pattern (1) shown in FIG. 2 can be used.
- the displacement stroke corresponding to the fluctuation of the applied potential is large, which is advantageous in increasing the response of the servo operation.
- the polymer actuator 130 has a physical strength enough to mount the objective lens driving actuator 500 and a driving force characteristic enough to displace the objective lens driving actuator by deformation. Need to be.
- two identical polymer activators 130 may be prepared. In this case, when the same potential is applied in the opposite polarity, the same potential is deformed (curved) in the opposite direction by the same stroke.
- two polymer actuators that deform (bend) in the opposite direction by the same stroke when the same potential is applied may be prepared. In the former case, a servo signal (potential) is applied to each polymer actuator 130 while reversing the polarity. In the latter case, a servo signal (potential) is applied to each polymer actuator 130 as it is. As a result, the center of the objective lens driving actuator 500 is displaced in the opposite direction in accordance with the deformation of the polymer actuator 130, whereby the objective lens 502 rolls in the tilt direction. become.
- the pair of polymer actuators 130 is mounted on a support (not shown) arranged on the housing 400 so as to be suspended on the housing 400, for example. Thereafter, the pair of flanges 501 formed on the base of the objective lens driving actuator 500 is placed on the center of the corresponding polymer actuator 130, respectively. The flange portion 501 is fixed on the polymer actuator 130.
- a servo signal (potential signal) for tilt correction is applied to the polymer actuator 130, and the objective lens driving actuator 500 is rolled in the tilt direction. Thereby, the optical axis of the convergent light converged by the objective lens 502 is tilted, and the tilt error of the optical axis on the disk is corrected.
- the lens driving mechanism for tilt correction can be made extremely simple. Also, since no heat or vibration is generated from the polymer actuator 130 during tilt drive, there is no problem that the characteristics of the pick-up device deteriorate due to heat or vibration from the drive source. Further, since the polymer actuator 130 consumes little power and generates almost no noise, the power consumption and noise of the pickup device can be reduced.
- FIG. 1 is a diagram showing a structure of a polymer film according to an embodiment.
- FIG. 2 is a diagram showing a structure of a polymer film according to the embodiment.
- FIG. 3 is a diagram illustrating a configuration of a polymer actuator according to the first embodiment.
- FIG. 4 is a diagram illustrating a configuration of a polymer actuator according to the first embodiment.
- FIG. 5 is a diagram illustrating a configuration of a polymer actuator according to the first embodiment.
- FIG. 6 is a diagram illustrating a main configuration of a lens driving device according to the first embodiment.
- FIG. 7 is a diagram illustrating a configuration of a main part of the lens driving device according to the first embodiment.
- FIG. 8 is a diagram showing a state where the lens driving device is mounted on an optical pickup.
- FIG. 9 is a diagram illustrating a main configuration of a lens driving device according to a second embodiment.
- FIG. 10 is a diagram showing a state where the lens driving device is mounted on an optical pickup.
- FIG. 11 illustrates a configuration of a main part of a lens driving device according to a third embodiment.
- FIG. 12 is a diagram illustrating a state where the lens driving device is mounted on an optical pickup.
- FIG. 13 is a diagram illustrating a main configuration of a lens driving device according to a third embodiment.
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Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
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JP2004158032 | 2004-05-27 | ||
JP2004-158032 | 2004-05-27 | ||
JP2005-125968 | 2005-04-25 | ||
JP2005-125969 | 2005-04-25 | ||
JP2005125969A JP2006012387A (ja) | 2004-05-27 | 2005-04-25 | レンズ駆動装置および光ピックアップ装置 |
JP2005125968A JP2006302458A (ja) | 2005-04-25 | 2005-04-25 | レンズ駆動装置および光ピックアップ装置 |
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WO2005116998A1 true WO2005116998A1 (ja) | 2005-12-08 |
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PCT/JP2005/009823 WO2005116998A1 (ja) | 2004-05-27 | 2005-05-23 | レンズ駆動装置および光ピックアップ装置 |
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WO2004014987A1 (ja) * | 2002-08-09 | 2004-02-19 | Eamex Corporation | 導電性高分子の製造方法 |
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WO2004014987A1 (ja) * | 2002-08-09 | 2004-02-19 | Eamex Corporation | 導電性高分子の製造方法 |
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