Abstract: An actuator for optical pick-up using the concentrated magnetization method that is capable of moving an objective lens converging a laser light beam onto an optical disc. In the actuator, a lens holder is attached to the objective lens. Coils are wound around the lens holder to receive a current. A permanent magnet constructs a magnetic circuit along with the coils to generate a driving force for the objective lens and is magnetized to concentrate a magnetic flux toward the coils. The actuator can improve a driving sensitivity in a wide frequency band with the aid of the permanent magnet in which a magnetic flux density concentrates on the effective surfaces of the coils.

Abstract: An optical scanning device having an improved response characteristic, for use in an apparatus for optically reading or writing information in one or more tracks on a recording medium. The object of the invention is to provide an optical scanning device which, without any electronic compensation means, very largely avoids resonance peaks and has an improved response characteristic. According to the invention, this object is achieved by a retaining plate which supports the objective lens of the scanning device via bearing elements and has at least one cutout, which separates the mounting points, in the surface which holds the bearing elements for the objective lens holder. The field of application of the invention is optical scanning devices having an improved response characteristic for use in equipment for reading or writing information on an optical recording medium, such as a CD, DVD, a CD or DVD which can be written to, or else a magneto-optical recording medium, for example.

Abstract: In a biaxial actuator including an objective lens for converging a laser beam emitted from a light source to irradiate the laser beam on an information recording surface of an optical disk and guiding a laser beam reflected by the information recording surface to a photo detector, and a holder for causing the objective lens to oppose the information recording surface with a predetermined gap, the objective lens and the holder are formed such that the objective lens and the holder are integrally molded by using a synthetic resin which can transmit a laser beam.

Abstract: A method for manufacturing an objective lens driving apparatus comprising a lens holder which holds an objective lens and is driven in a focusing direction and a tracking direction with reference to the optical disk, at least two wires having first ends secured to the lens holder and controlling posture of the lens holder, and a wire holder to which second ends of the wires are fixed, the method comprising the steps of preparing a first integrally molded member including the lens holder and the wire holder which are connected together by a holder connecting frame to be removed after assembly, preparing a second integrally molded member including the wires which are suspended from a wire holding frame to be removed after assembly, positioning the second integrally molded member relative to the first integrally molded member such that the first ends of the wires are connected to the lens holder and the second ends of the wires are connected to the wire holder, and removing the wire holding frame and the holder

Abstract: Disclosed herein is an optical storage device having an objective lens actuator for moving an objective lens in a focusing direction. The objective lens actuator includes an actuator base fixed to a carriage movable in the radial direction of an optical disk, a lens holder for holding the objective lens, and a supporting mechanism for elastically supporting the lens holder to the actuator base. The actuator base has an elongated hole extending in the radial direction of the optical disk. A relative position between the actuator base and the carriage is adjusted so that the tilt of the optical axis of the objective lens in the radial direction of the optical disk occurring in displacing the lens holder in the focusing direction is minimized, and thereafter the actuator base is fixed to the carriage by means of screws.

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: In accordance with the present invention a pickup device for optical disks includes spring wires supporting displaceably in focusing and tracking directions a lens holder holding an objective lens. One set of more than two spring wires is provided for each side of the lens holder and a total of two such sets of spring wires are arranged parallel to each other. Of more than two spring wires of each set, at least one spring wire has a cross section allowing a spring constant in the focusing direction and that in the tracking direction to vary from each other and is also positioned farther or closer than the remaining spring wires away or to a centerline of the objective lens. As such the pickup device can ensure a sufficient displacement in the focusing and tracking directions and also control an inclination of the lens holder.

Abstract: In an objective lens driving device for an optical disk, a plurality of elastic supporting members supporting an objective lens have bent portions bent approximately in the focus direction and are arranged in parallel approximately in the focus direction to cause expansion/contraction of the elastic supporting members in the direction offsetting a moment M. With this structure, a tilt correction method of the movable portion, a tilt correction method of an objective lens for an optical disk, and an objective lens driving device for an optical disk can be provided capable of reducing the size of the movable portion, minimizing tilt of the objective lens in the focus direction to provide enhanced optical performance, and restraining a resonance peak by the elastic supporting members.

Abstract: An optical pickup apparatus suited for reducing the size and thickness and capable of performing a tilt control of an objective lens with ease, and an optical disk apparatus.

Abstract: An optical pickup assembly is provided having a base; an objective lens including a body portion and a lens portion built into the body portion; a suspension wherein one end is fixed to the body portion and the other end is fixed to a holder supporting the objective lens such that the objective lens is movable; coil members formed at the sides of the body portion of the objective lens; permanent magnets mounted on the base, opposite to the coil members; and yokes for guiding magnetic flux generated by the permanent magnets. In the optical pickup assembly, the objective lens is constructed such that the body portion serving as a bobbin is combined with the lens portion, thereby reducing the weight of the moving part. As a result, the moving part can sensitively accelerate with application of a voltage.

Abstract: An optical pickup device comprises an optical pickup body, a lens holder for holding the objective lens, a movable support member connected to the lens holder through a plurality of elongated flexible members for movably supporting the lens holder, a support section provided on the optical pickup body, said support section being arranged substantially perpendicular to an optical disc on which information is to be recorded or from which information is to be read out. In particular, the movable support member is adjustably attached on the support section in such a manner that the position of the objective lens is adjustable.

Abstract: An optical pickup comprises an objective-lens driving device including a movable section provided with an objective lens, a focusing coil, and tracking coils, and a fixed section provided with a single magnetic circuit having a magnetic gap, the focusing coil and the tracking coils being disposed in the magnetic gap. The point of application of a tracking-driving force, the point of application of a result force of focusing-driving forces occurring in and outside the magnetic gap, and the position of the center of gravity of the movable section are made to substantially coincide with each other. In addition, the objective lens and the magnetic circuit are disposed within an area of a window in a lower shell of a optical disk. Further, a through hole for accommodating a lower portion of a yoke of the magnetic circuit is provided in a mounting base on which the objective-lens driving device is mounted.

Abstract: A lens holding member carrying an objective lens is movable and supported by a fixed member via a plurality of supporting members. Each supporting member includes a bent part in its base portion on the side of the fixed member. The bent part is bent in a first direction (focusing direction) and a second direction (tracking direction) that are perpendicular to each another. Each supporting member is shaped so as to make all the principal planes of the supporting member parallel to the second direction. The fixed member includes a concave, which is impregnated with a gel material so that the bent part is covered with the gel material.

Abstract: A coil unit on which a focus coil and tracking coils are formed is arranged in a magnetic gap of a magnetic circuit including at least one magnet polarized on two poles in the focusing direction. The magnet and the tracking coils are arranged so that the boundary between the north pole and the south pole of the magnet polarized on two poles in the focusing direction falls within the width formed by the horizontal sides of the tracking coil in the focusing direction, the focusing direction is perpendicular to the focusing direction, when the coil unit is moved in the focusing direction.

Abstract: An optical pick-up actuator of the present invention includes a lens holder having a objective lens and tracking and focusing coils, a frame for raising the lens holder in a magnetic field using a suspension wire, and a tilt driving magnetic circuit for driving the actuator in a third direction as well as focusing and tracking directions.

Abstract: A lens driving apparatus for a disk player capable of easily approaching to the innermost circumference of a disk and realizing a reduction in size and weight thereof, in which: an actuator section where a movable portion including printed board coils fixed to the respective side surfaces of a lens holder containing an objective lens is movably supported by outer circumferential side wire-form elastic members and inner circumferential side wire-form elastic members fixed to an actuator base, and a suspension base including a pair of yokes to which a pair of magnets disposed so as to be opposed to each other with a predetermined magnetic space therebetween are fixed and standing portions are included; and a width Wi of each of the inner circumferential side wire-form elastic members is set to be greater than a width Wo of each of the outer circumferential side wire-form elastic members.

Abstract: In an objective lens driving device having a movable portion including an objective lens held by a lens holder, a damage prevention system for preventing the objective lens or a disk from being damaged when the objective lens or the lens holder collides with the disk is provided. The damage prevention system is constituted by inserting a protecting member formed of an elastic member in a fitting portion on an upper surface of the lens holder while being deformed. In this manner, it is possible to generate a sufficient holding power with respect to the protecting member without using glue or the like.

Abstract: In order to provide an optical pickup apparatus having a structure suitable for making thin, compact and light, there is provided a yoke member having two standing plates for forming magnetic poles and a horizontal yoke plate for connecting the standing plates to each other and having a U-shaped cross section, magnets provided on surfaces in the mutually opposing sides of two standing plates, a focus coil formed by being wound in an annular shape and arranged around the standing plate in a movable manner in a height direction and two track coils formed by being wound in an annular shape, in which a size in the direction of the horizontal width of the magnet is set to be equal to or greater than a height in the standing direction of the magnet, and a size in the direction of the horizontal width of the yoke is set to be equal to or greater than a height in the standing direction of the yoke.

Abstract: In an optical pickup device, wires 16A through 16D resiliently support a lens holder 12 in a cantilever fashion. Of the wires, wires 16A and 16C arranged so as to overlap when viewed in a tracking direction are fixed together by heat sealing. The wires 16B and 16D are arranged independently of each other. In each of the wires 16A through 16D, a portion 166 close to the base end of the wire is squeezed from a focusing direction, and a portion 167 close to the tip end of the wires is squeezed from the tracking direction.