Abstract: An optical type pick-up actuator can include a lens holder having an object lens for condensing a light on an optical disc mounted at one side thereof and activated in a predetermined direction, and a plurality of yokes and magnets facing one another. A focusing coil and a tracking coil can be installed between the plurality of magnets, and disposed in a Y-axis direction to activate the lens holder by an electromagnetic force with the magnets in focusing and tracking directions.

Abstract: Disclosed is a lens mechanism made of a flexible support with a lens positioned on the support. A sensor is positioned below the lens so that it senses photons passing through the lens. At least one actuator is positioned around the lens such that a change in an electric charge on the actuator causes the lens to move. In one embodiment, the lens moves along its optical axis. In another embodiment, the lens moves so that its optical axis tips from the original orientation. In yet another embodiment, the lens moves due to a change in electric charge on an electrostatic charge layer that is substantially coincident with the lens. Embodiments of the invention can provide a dynamic actuator mechanism for positioning a small lens.

Abstract: An autofocus actuator includes a cover which is provided with elastic tabs in addition to protrusions to which a stopper attached to a holder with a lens unit abuts when the holder is excessively displaced by, for example, a fall of an electronic equipment provided with the autofocus actuator. The protrusions are provided on the peripheral edge of an opening formed in the cover, and the elastic tabs are also provided on the peripheral edge of the opening. Each of the elastic tab has one end which is supported on the cover and the other end which protrudes from the peripheral edge of the opening in a cantilever manner so that the other end makes abutment with the stopper attached to the holder before the stopper makes contact with the protrusions to thereby absorb a shock applied to the holder.

Abstract: A CD-DVD compatible optical pickup in which both on-axis and off-axis light form a circular light spot on a recording surface of an optical recording medium, and an optical recording and/or reproducing apparatus using the same. The CD-DVD compatible optical pickup includes an optical output module, an objective lens, an optical path conversion unit, a photodetector, and an actuator. The optical output module has a mount and light sources emitting light of different wavelengths. The objective lens focuses the emitted light onto two types of optical recording media. The optical path conversion unit between the optical output module and objective lens, converts incident light. The photodetector receives beams emitted from the light sources, reflected from the optical recording media, and then passed through the optical path conversion unit, detecting data and error signals. The actuator has a movable member, moving the objective lens and compensating focusing and tracking error signals.

Abstract: An objective lens drive device (8) includes a supporting block (9), a movable block (10) for holding an objective lens (27), and supporting springs (22) for connecting the supporting block and the movable block. Elements of the supporting block of the objective lens drive device (8) are a stationary section (11), a supporting shaft (12), a tilt drive section (13), and tilt drive magnetic circuits (20 and 20). The stationary section (11) is secured to a movable base (7) that is movable in radial directions of a disc-shaped recording medium (100). An axial direction of the supporting shaft (12) is perpendicular to both focusing directions and tracking directions. The tilt drive section (13) is rotatably supported at the stationary section through the supporting shaft and is connected to the movable block through the supporting springs. The tilt drive magnetic circuits (20 and 20) are used to rotate the tilt drive section with respect to the stationary section.

Abstract: An optical disk drive includes an optical pick-up unit having a fixed part with at least a light source, and a movable part mounted on a guide. The movable part includes a mirror, a focusing lens, and lens-moving elements. The movable part is adapted to move a focused beam along the disk. A single PCB is provided having a signal connection to the lens-moving elements on the movable part of the pick-up unit though flexible wires. The PCB serves as a mounting base for the fixed part of the optical pick-up unit, the guide, and the drive motor.

Abstract: A lens holder is so supported that the lens holder is movable along a supporting shaft in parallel to an optical axis of the object lens, and rotatable about the supporting shaft. Magnets are mounted on the lens holder. Focusing coils and tracking coils having sides facing the magnets are mounted on a base on which the supporting shaft is planted. Yokes are so provided that the yokes and the magnets respectively sandwich the focusing coils and the tracking coils. The yokes have facing portions that face respective magnetic poles of the magnets and extending portions extending in the directions away from the magnets.

Abstract: An autofocus actuator is provided by which it is possible to easily confirm that a holder and a yoke do not make contact with each other even when the space between the holder and the yoke is made as small as possible in order to improve shock resistance. The autofocus actuator includes light transmission holes for confirming a space between an inner peripheral surface of an inner cylindrical portion of the yoke and an outer peripheral surface of a cylindrical portion of the holder provided with a lens unit and being capable of adjusting its position in the optical axis direction by supplying electrical power to a coil secured to the holder. The light transmission holes are provided at predetermined positions of a flange portion of the holder and a stopper for attaching a leaf spring to the holder, respectively, so that light can pass therethrough.

Abstract: The present invention provides an optical pickup device comprising a light condensing means for condensing light emergent from a light source to an optical disk, a light condensing holder on which the light condensing means is mounted, a suspension holder for elastically supporting the light condensing holder, a focus coil mounted on the light condensing holder, a tracking coil mounted on the light condensing holder, and a magnetic field impression means for impressing a magnetic field upon the focus coil and the tracking coil, wherein the tracking coil is composed of a first to a third tracking coil portion combined with each other.

Abstract: A lens position determination apparatus of an optical pickup includes a lens holder with a mounted lens, a base supporting the lens holder, and a pressing member. The base has an accommodation surface accommodating the lens holder and a pair of facing support walls on the accommodation surface. The pressing member is a bendable arm. A first elastic portion between arm end portions applies an elastic force in a direction in which the arm end portions closely contact the support walls. A second elastic portion connected to the arm presses the lens holder toward the accommodation surface to fix the lens holder position. The lens adjustment can be performed while the pressing force to fix the lens holder to the base is removed by bending the pressing member into a V shape to reduce frictional resistance of the lens holder with the base during the adjustment.

Abstract: Systems and methods for actuating lens assemblies (e.g., for purposes of zoom and/or focus lens operations) that may be implemented, for example, in any camera lens or other lens application that employs one or more actuatable lenses.

Abstract: An objective lens driving apparatus for an optical pickup includes a blade on which an objective lens can be mounted, a plurality of elastic support members supporting the blade and capable of elastically moving with respect to the blade, and a servo mechanism driving the blade up and down, left and right, and in a rotational direction. The elastic support members are grouped into pairs arranged to face each other with respect to a center of rotation of the blade, and distances between the elastic support members in the respective pairs are substantially identical. By lessening the difference in the amount of deformation between the elastic support members supporting the blade during tilt control, the elastic support members are less likely to move in undesired directions when vibration is applied.

Abstract: A lens actuator includes a lens holder to support an objective lens and having a pair of first side surfaces in a tracking direction and a pair of second side surfaces in a tangential direction, a fixed magnet disposed to confront the second side surface and comprising four regions having approximately the same area and are magnetic, such that magnetic directions of the four regions are perpendicular to a plane including a focusing direction and the tracking direction but are in opposite directions between two mutually adjacent regions, a pair of tracking coils disposed between the second surface and the magnet and having centers located on an outer side of corresponding centers of the four regions in the tracking direction, a focusing coil disposed between the second surface and the magnet and having a center located on an outer side of corresponding centers of the four regions in the focusing direction, and a radial tilt coil disposed between the second surface and the magnet and having a center located on

Abstract: A lens actuator keeps an objective lens focused on a track in an information recording layer of an optical disc against fluctuation unavoidable for the optical disc, and has a lens holder, three electromagnetic actuators for moving and tilting the lens holder and three pairs of elastically deformable conductive connecting rods connected to both side surfaces of the lens holder for movably retaining the lens holder over a base plate; since two pairs of elastically deformable conductive connecting rods are symmetrically arranged on upper and lower sides of the remaining pair, the lens holder is smoothly tilted and moved in the radial direction of the optical disc without any tilt, whereby the lens actuator promptly and exactly cancels the fluctuation of the optical disc.

Abstract: It is an object of the present invention to provide an optical pickup apparatus appropriate for the notebook PC that can prevent structural resonance of the lens holder by arranging the focus coil and the tracking coil in a way to stabilize the weight balance, enable the tilt servo, and be composed in an extremely reduced thickness. An optical pickup apparatus composed to adjust the irradiation position of light beam to an optical disk by displacing an objective lens through a driving control of a lens holder holding the objective lens with a moving coil method, wherein an objective lens driving section is composed by arranging and fixing focus coils 7a, 7b so that a pair of coil main bodies be symmetrical about the objective lens 4 arranged at the middle of the lens holder 4, and arranging a pair of tracking coils 8a, 8b, 8c, 8d at both sides of the respective focus coils.

Abstract: An optical disk drive apparatus has an objective lens which converges a light beam to direct it to an optical disk, an objective lens support, an elastic support member which movably supports the objective lens on the objective lens support portion, and a coil and a magnet. The coil and magnet are capable of moving the objective lens against an elastic force of the elastic support member relative to the objective lens support portion so as to vary an angle of incidence of the light beam emitted from the objective lens with respect to an irradiated surface of the optical disk. The angle of incidence is adjusted by an electric power supplied to the coil.

Abstract: An optical pickup apparatus for an optical disk drive records or reproduces data on or from an optical disk, includes an optical head section including an object lens focusing an incident light on the optical disk, a slider on which the object lens is mounted, wherein the slider floats over the optical disk by an air bearing generated between the optical disk and the slider, a bobbin on which the slider is mounted, and a flexure disposed between the slider and the bobbins elastically supporting the slider. A driving unit drives the slider in a tracking direction and a focusing direction. In the above construction, the slider floats over a recording surface of the optical disk due to an air bearing and a near field between the object lens and the optical disk can be controllably maintained.

Abstract: An optical pickup actuator includes a base having a holder installed at one side thereof, a moving portion in which an objective lens is installed at the periphery thereof and a guide hole is formed, a bobbin coupled to the guide hole, a magnetic driving portion provided at the base and symmetrically arranged to make the moving portion perform focusing and tracking, and suspensions having one end supported at the holder and the other end fixed to the moving portion to be connected to the bobbin. Thus, since the magnetic driving portion is symmetrically arranged, a pitching mode and a rolling mode generated due to an asymmetrical structure are prevented. Also, the AC sensitivity and DC sensitivity can be improved.

Abstract: An objective lens driving apparatus is used for accurately positioning an abject to focus a light spot on an optical recording medium. A lens holder holds the objective lens and has a bearing hole through which a shaft extends in a direction parallel to the optical axis so that the lens holder is rotatably supported on the shaft. Two magnets are supported on the lens holder so that the shaft is between the magnets. A base has two magnetic members disposed such that each of the two magnets exerts an attraction force on a corresponding one of the two magnetic members to urge the lens holder in a direction of the optical axis and in a direction perpendicular to the optical axis. A first coil set of first focusing and tracking coils and a second coil set of focusing and tracking coils are mounted to the two magnetic members.

Abstract: A relay lens driving device provided in an optical head moves a relay lens in the direction of an optical axis thereof to correct a spherical aberration that may be caused by an error in the thickness of a cover layer of an optical disk. The relay lens driving mechanism has a lens to correct spherical aberrations, a lens holder which holds the lens, a first parallel plate spring which supports the lens holder at one end thereof, an intermediate member attached to the other end of the first parallel plate spring, a second parallel plate spring arranged to extend from the intermediate member to the lens holder to support the intermediate member at one end thereof, and a fixing member which fixes the other end of the second parallel plate spring.

Abstract: A balanced microdevice comprising a substrate, a movable structure overlying the substrate, an element and a lever assembly having a pivot and a lever coupled to and pivotable about the pivot. The lever has a first extremity coupled to the movable structure and an opposite second extremity coupled to the element. The movable structure causes the lever to pivot about the pivot so as to move the element in a direction of travel. The element is substantially mechanically balanced to inhibit undesirable movement of the element in the direction of travel in response to externally applied forces.

Abstract: An optically recorded information recording and/or reading apparatus which eliminates the influence of stray light occurring within an optical system. In a state or a focus state which is forcedly set to position a reading point outside the outermost periphery of a disk surface, and the signal level is adjusted in a signal combiner circuit such that a light receiving level at that time matches a desired level.

Abstract: An optical pick-up actuator for optical pick-up devices is disclosed. In the actuator of this invention, the blade positioned to float above a yoke plate has one focusing coil, two tracking coils and two tilting magnets. The yoke plate has two side yokes holding two tilting coils at positions vertically aligned with the two tilting magnets. The tilting magnets are formed on the lower surface of the blade at positions, which are symmetrical around the perpendicular optical path of an object lens of the blade or around the tilting axis of the blade. The tilting magnets of the blade and the tilting coils of the yoke plate are operated under the control of a solenoid. When a current flows in the tilting coils, the tilting magnets generate electromagnetic fields to tilt the blade at a desired angle relative to the perpendicular optical path of the object lens.

Abstract: A data storage module for a data storage device has a rotor having a plurality of storage areas for data storage, the storage areas each being in one of a plurality of states to represent the data stored in that area. A first set of flexures suspends the rotor within a first frame and permits the rotor to move in a first direction. A first comb drive is connected to the rotor and the first frame for moving the rotor in the first direction. A second set of flexures suspends the first frame within a second frame and permits the first frame to move in a second direction normal to the first direction. A second comb drive is connected to the first frame and the second frame for moving the first frame in the second direction.

Abstract: A drive unit for driving an objective lens of an optical head includes: a lens holder 12 for holding an objective lens; a plurality of coils Tr1, F11, F21, Tr2, F21, F22, which are provided on two sides 12a, 12b of the lens holder 12 by three coils; a plurality of wires of the first to the third wire W1 to W3 for supplying electric currents to the coils and for supporting the lens holder 12; magnets 31, 32 for generating a magnetic field in the coil portions, wherein the plurality of coils includes a first system coil F11, F12 connected between the first wire W1 and the common wire W4, a second system coil F21, F22 connected between the second wire W2 and the common wire W4, and a third system coil Tr1, Tr2 connected between the is third wire W3 and the common wire W4.

Abstract: For moving an objective lens in its optical axis direction and its tracking direction perpendicular to the optical axis direction, a lens drive apparatus includes a movable section to which a focus coil and a tracking coil are annexed, and a fixed section for supporting the movable section. The fixed section includes magnetic field units correspondingly to coils. The axis of inertia (z-axis) passing through the center of gravity of the movable section is accorded with the optical axis of the objective lens, and the tracking coil is provided on a side surface of the movable section on one side in the x-axis direction (the linear velocity direction of a disk), and the focus coil is provided on the side surface on the other side. The center of gravity of the movable section and the driving center are regulated at positions sifted from each other in the x-axis direction.

Abstract: An object of the invention is to secure a high reading performance in an optical pickup even if magnets are miniaturized. In an optical pickup, around a lens holder which holds a lens, track coils are wound from a range of a flange of the lens to the outside in a diameter direction. The track coils become close to an optical axis of the lens and close to the center of a magnetic field formed in a unipolar face-to-face type of magnetic circuit, with the result that it is possible to displace so that the optical axis is hard to be tilted and secure high reading accuracy. By forming a wound line shape of a focus coil and the track coils into a hexagon or the like, it is possible to make curving magnetic fluxes generated around magnetic pole surfaces hard to affect in the unipolar face-to-face type of magnetic circuit.

Abstract: The method of assembling a pick-up actuator includes assembling a lens holder assembly to a base unit creating a magnetic gap between complementary electromagnetic components of the lens holder assembly and the base unit, disposing a quantity of a volatile magnetic fluid or a low viscosity oil-based magnetic fluid into the magnetic gap created between complementary electro-magnetic components of a lens holder assembly and a base unit, fixing resilient support members between the lens holder assembly and the base unit. The optical pick-up actuator includes a lens holder assembly, a base unit, resilient support members connecting the lens holder assembly and the base unit, an electromagnetic drive system, and a volatile magnetic fluid or a low viscosity oil-based magnetic fluid.

Abstract: A micro-electro-mechanical device comprises a moveable mass, a frame for supporting the mass, and a flexure extending between the mass and the frame. The flexure includes an integral actuator for moving the mass member with respect to the frame.

Abstract: An apparatus for moving an optical element in an opto-mechanical system, includes at least one circularly symmetric flexure surrounding the optical element, and a device for moving the optical element along an axis perpendicular to and extending through the center of the flexure. A number of flexures may be provided in a stack with spacers therebetween, and the optical element may be mounted in a tubular member supported by two spaced apart stacks. Structure is also provided for damping end of movement vibrations.

Abstract: In an optical pickup actuator performable a tilting operation which operates an object lens so as to follow the center of signal tracks of an optical disc, an optical pickup actuator performable a tilting operation includes a plurality of damper holders separately fixed to both sides of a base, a lens holder placed between the plurality of damper holders and having an object lens for reading and writing information on a disc, suspension support means separately connected between both sides of the lens holder and the plurality of damper holders so as to support the lens holder as two sides one-stage support structure, and magnetic operating means separately installed at the lens holder and the base and operating the lens holder so as to follow an optical disc, accordingly an optical pickup actuator performable a tilting operation in accordance with the present invention can perform not only a translational motion in a tracking direction and a focusing direction but also a tilting motion in a radial direction a

Abstract: A flexure for a micro-electro-mechanical device includes a longitudinal beam. An actuator integral to the beam acts to flex the beam when activated.

Abstract: An optical actuator according to this invention includes a focusing lens for focusing a laser beam on a information disk, a lens holder for holding the focusing lens, a focusing coil for driving the focusing lens in an axial direction of the laser beam, a tracking coil for driving the focusing lens in a radial direction of the information disk, a tilting coil for pivotally rotating the focusing lens on an axis along the tangential direction of the disk and a pair of supporting members each disposed on each opposing sides of the lens holder. Each of the supporting members having at least three fixing elements disposed in an approximately circular arc, and a plurality of linear elastic members are connected to each of the fixing elements.

Abstract: An objective lens unit has a reinforcing frame portions formed along an outer peripheral surface of each of a pair of tracking coils by applying an epoxy resin adhesive to portions between a lens holder and the outer peripheral surface of each of the tracking coils. Reinforcing core portions are formed by filling the epoxy resin adhesive into a central hole of each of the tracking coils, and a reinforcing connecting portion is formed by filling the epoxy resin adhesive into a gap defined by the lens holder, each of the tracking coils, and a focusing coil.

Abstract: An optical pickup includes a lens holder body having a first surface and a second surface opposing to each other, tracking coils, a focusing coil, and tilt coils which are formed on a pair of flat panels respectively disposed on the first and second surfaces, and first and second magnetic bodies respectively disposed to face the first and second surfaces of the lens holder body and each constituting a planar closed magnetic circuit.

Abstract: An optical pickup actuator which can compensate for a curvature of a disc, an optical pickup employing the optical pickup actuator, and an optical recording/reproducing apparatus employing the optical pickup. The optical pickup actuator includes a base having a holder, a bobbin mounting an objective lens, a plurality of elastic supports having one end coupled to the holder and another end coupled to the bobbin such that the bobbin is movably supported, and a magnetic driving portion which drives the bobbin in a focusing direction and for a tracking direction. The plurality of elastic supports includes inner elastic supports that are positioned on a side of the optical pickup actuator closest to a center of the disc and outer elastic supports that are positioned on an opposite side of the optical pickup actuator closest to an outer perimeter of the disc, and the inner elastic supports and outer elastic supports have different lengths.

Abstract: An optical pickup actuator and an optical recording and/or reproducing apparatus adopting the optical pickup actuator. The optical pickup actuator includes a bobbin in which an objective lens is mounted, and suspension wires each having one end fixed on a side of the bobbin and the other end fixed to a holder disposed on a portion of a base to allow the bobbin to move with respect to the base. A magnetic circuit is installed in the bobbin and the base including a pair of unipolar magnets positioned on the base to face two sides of the bobbin. A focusing coil is wound around the bobbin. A pair of tracking coils are wound opposite one another and next to the objective lens in the radial direction to cross over the focusing coil so as to encircle the bobbin and interact with the unipolar magnets to generate an electromagnetic force to control a tracking movement.

Abstract: An optical pickup has a lens that is resiliently supported in such a manner as to be displaceable in different directions by pairs of a first wire, a second wire, and a third wire which are attached to a fixing portion by attaching means. The optical pickup includes a lens holder for holding the lens, and a printed circuit board secured to the lens holder. The first, second, and third wires have the same length and are formed of the same material, and are soldered to the printed circuit board at different distances from the attaching means.

Abstract: An optical head is driven in a tracking direction with respect to a rotating optical disc. The optical head includes a light source, an optical block, a condenser shifter, and a rotating mechanism. The light source is used to read and write data from/on the optical disc. The optical block supports the light source. The condenser shifter includes a condenser, a movable body, a base, a focus direction drive mechanism and a tracking direction drive mechanism. The condenser focuses light, emitted from the light source, toward the optical disc. The movable body supports the condenser. The base supports the movable body elastically such that the movable body is able to shift in a focus direction and in the tracking direction. The focus and tracking direction drive mechanisms are provided to shift the movable body in the focus and tracking directions, respectively.

Abstract: An objective lens drive device (8) includes a supporting block (9), a movable block (10) for holding an objective lens (27), and supporting springs (22) for connecting the supporting block and the movable block. Elements of the supporting block of the objective lens drive device (8) are a stationary section (11), a supporting shaft (12), a tilt drive section (13), and tilt drive magnetic circuits (20 and 20). The stationary section (11) is secured to a movable base (7) that is movable in radial directions of a disc-shaped recording medium (100). An axial direction of the supporting shaft (12) is perpendicular to both focusing directions and tracking directions. The tilt drive section (13) is rotatably supported at the stationary section through the supporting shaft and is connected to the movable block through the supporting springs. The tilt drive magnetic circuits (20 and 20) are used to rotate the tilt drive section with respect to the stationary section.

Abstract: An actuator for an optical pickup includes a base, a holder fixed to the base, a moving portion on which an objective lens for focusing incident light onto a disc and a liquid crystal panel for correcting spherical aberration are mounted, a magnetic driving portion which drives the moving portion in a radial direction and in a focusing direction relative to the disc, and a connection section which includes a first connection part which serves as an electrical connection path of a signal used to drive the magnetic driving portion and has at least four wires, and a second connection part electrically independent of the first connection part, which serves as an electrical connection path of a signal used to drive the liquid crystal panel, and has wires, and which supports the moving portion to be movable with respect to the holder.

Abstract: An optical head and a disk drive reduce the weight of a moving section of the optical head including an objective lens, and achieve more precise aberration correction by independently driving the objective lens and an aberration correcting device. An optical head (3) that constitutes a disk drive (1) is provided with an aberration correcting device (8) for an optical system including an objective lens (6). A first driving means (7) for driving the objective lens (6) and a second driving means (9) for driving the aberration correcting device (8) or a moving section including the device and components (10) of the optical system are provided. The misalignment between the objective lens (6) and the aberration correcting device (8) is corrected.

Abstract: The present invention provides an optical pickup device comprising a light condensing means for condensing light emergent from a light source to an optical disk, a light condensing holder on which the light condensing means is mounted, a suspension holder for elastically supporting the light condensing holder, a focus coil mounted on the light condensing holder, a tracking coil mounted on the light condensing holder, and a magnetic field impression means for impressing a magnetic field upon the focus coil and the tracking coil, wherein the tracking coil is composed of a first to a third tracking coil portion combined with each other.

Abstract: A lens actuator includes a lens holder to support an objective lens and having a pair of first side surfaces in a tracking direction and a pair of second side surfaces in a tangential direction, a fixed magnet disposed to confront the second side surface and comprising four regions having approximately the same area and are magnetic, such that magnetic directions of the four regions are perpendicular to a plane including a focusing direction and the tracking direction but are in opposite directions between two mutually adjacent regions, a pair of tracking coils disposed between the second surface and the magnet and having centers located on an outer side of corresponding centers of the four regions in the tracking direction, a focusing coil disposed between the second surface and the magnet and having a center located on an outer side of corresponding centers of the four regions in the focusing direction, and a radial tilt coil disposed between the second surface and the magnet and having a center located on

Abstract: A CD-DVD compatible optical pickup in which both on-axis and off-axis light form a circular light spot on a recording surface of an optical recording medium, and an optical recording and/or reproducing apparatus using the same. The CD-DVD compatible optical pickup includes an optical output module, an objective lens, an optical path conversion unit, a photodetector, and an actuator. The optical output module has a mount and light sources emitting light of different wavelengths. The objective lens focuses the emitted light onto two types of optical recording media. The optical path conversion unit between the optical output module and objective lens, converts incident light. The photodetector receives beams emitted from the light sources, reflected from the optical recording media, and then passed through the optical path conversion unit, detecting data and error signals. The actuator has a movable member, moving the objective lens and compensating focusing and tracking error signals.

Abstract: An apparatus for driving an objective lens of the present invention includes: a base which is moved along an optical disk; an objective lens disposed so as to be opposed to the optical disk and having an optical axis in a vertical direction with respect to the optical disk, for optically recording information onto the optical disk or optically reproducing information from the optical disk; a holder portion for holding the objective lens; a plurality of elastic arms extending between the base and the holder portion in a tangent direction of the optical disk, for supporting the holder portion movably with respect to the base; and a driving portion for generating an electromagnetic force for moving the holder portion with respect to the base, wherein the elastic arms are disposed away from each other in a vertical direction, the base includes each movable portion for supporting one end of each of the elastic arms, and each of the movable portions is supported at each position in a vertical direction outside of o

Abstract: An optical pickup apparatus includes an object lens opposed to a disk, a fixing section, and a bobbin suspended by the fixing section and four or more longitudinal elastic members for supporting the object lens. A plurality of coil pairs symmetric with respect to a point (180 degrees), the centroid of the object lens placement face of the bobbin exist and are placed in a different surface.

Abstract: An optical pickup actuator, an optical pickup employing the optical pickup actuator, and an optical disc drive apparatus employing the optical pickup. The optical pickup actuator includes a blade on which an objective lens for condensing light onto an optical disc is mounted, and on which coils are wound, and a base which includes a plurality of driving magnets, which interact with current flowing through the coils, to generate force that drives the blade in a predetermined direction and a shielding magnet, which is arranged opposite to and has the same polarity as at least one of the driving magnets, to block leakage magnetic flux from the driving magnets.

Abstract: In an optical pickup actuator recording or reproducing information onto an optical disc, the optical pickup actuator includes a lens holder installed an object lens focusing an optical beam onto an information recording surface of an optical disc and having a hole at the center portion, focusing/tilt operating means installed inside the hole of the lens holder and generating magnetic force so as to operate the lens holder in a focusing or tilt direction and tracking operating means respectively installed at the right and the left sides of the lens holder and generating magnetic force in order to operate the lens holder in a tracking direction, accordingly it is possible to perform a radial tilt movement with a focusing and a tracking movements and obtain a thinner optical pickup apparatus.

Abstract: An objective-lens driving apparatus includes permanent magnets on both ends of the movable unit, simultaneously, on the other side of the movable unit parallel to the tracking direction, also a permanent magnet at a position closer to the center of the movable unit. This configuration makes it possible to reduce each moment generated at each of a focusing coil and a tracking coil when an objective lens is displaced.