Coil Or Magnet Patents (Class 720/683)
  • Patent number: 11582380
    Abstract: A focus module for an optoelectronic sensor is provided that has a focus adjustable optics, a focus adjustment unit for varying a focal position of the optics, and a focus control to move the optics into a focal position corresponding to a distance value by means of the focus adjustment unit. The focus module here furthermore has a distance sensor for determining the distance value and the focus adjustment unit, the focus control, and the distance sensor are parts of the focus module.
    Type: Grant
    Filed: October 26, 2020
    Date of Patent: February 14, 2023
    Assignee: SICK AG
    Inventors: Florian Schneider, Tobias Pontiggia, Jonathan Pfeil
  • Patent number: 11467395
    Abstract: An electro-mechanical device includes a payload of a magnet affixed to a mirror, and a coil assembly. The coil assembly has a body with wound electrically conducting wires and a payload aperture through which the payload travels. When voltage is applied to the coil assembly, current through the coil assembly generates a magnetic field resulting in a net upward force on the magnet that accelerates the payload to travel upward through the payload aperture for the mirror to block an optical pulse. As the magnet travels through the payload aperture, due to a magnetization direction of the magnet and a magnetic field in an upper portion of the coil assembly, the magnet experiences a net deceleration force that arrests the payload.
    Type: Grant
    Filed: June 12, 2020
    Date of Patent: October 11, 2022
    Assignees: CALIFORNIA INSTITUTE OF TECHNOLOGY, MASSACHUSETTS INSTITUTE OF TECHNOLOGY
    Inventors: Richard Abbott, Peter Fritschel, Kavya Sreedhar
  • Patent number: 9201238
    Abstract: In an optical scanning device, a lower frame includes a first wall contacting an optical element, a second wall connected to a second-wall connecting portion of the first wall, a third wall connected to a third-wall connecting portion of the first wall, and a biasing member having a first end contacting the optical element and a second end supported by a scanner frame to press the optical element against the first wall. The second wall extends in a traverse direction angled with respect to a direction in which the first wall extends. The third wall extends in a direction facing away from an optical element side of the first wall on which the optical element is located. The optical element is in contact with at least one position of the first wall which position is between the second-wall connecting position and the third-wall connecting position.
    Type: Grant
    Filed: December 6, 2013
    Date of Patent: December 1, 2015
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventor: Shinya Kusuda
  • Patent number: 8861320
    Abstract: Provided is a lens driving unit for an optical pickup and an optical disc drive that employs the lens driving unit. The lens driving unit includes a lens frame in which an object lens and a plurality of driving coils are installed, and a plurality of suspension wires connected to the driving coils. The lens frame also includes a plurality of winding posts disposed on opposing sides of the lens frame and extending in a direction in which the suspension wires extend. According to various examples, coil ends of the driving coils are wound around the winding posts to electrically connect the driving coils to the suspension wires.
    Type: Grant
    Filed: November 13, 2012
    Date of Patent: October 14, 2014
    Assignee: Toshiba Samsung Storage Technology Korea Corporation
    Inventors: Young-bin Lee, Seok-gyun Lee
  • Patent number: 8667517
    Abstract: Provided is a compact-type objective lens (OBL) holder and the like provided with a bobbin making it possible to appropriately wind a coil therearound. An OBL holder of the present invention includes: a main surface portion provided with a fixing part on which an objective lens is fixed; and a first side-wall portion and a second side-wall portion provided with bobbins around which tracking coils for driving the OBL holder itself by using a magnetic effect are wound. Further, in the present invention, each bobbin includes a tubular portion and a through-hole penetrating the tubular portion in a thickness direction thereof. Thus, an adhesive can be supplied to the tracking coil through the through-hole.
    Type: Grant
    Filed: July 12, 2012
    Date of Patent: March 4, 2014
    Assignee: SANYO Electric Co., Ltd.
    Inventors: Shunichi Morimoto, Noboru Tajiri, Shingo Matsuzaki, Mitsuhiko Uchida
  • Patent number: 8599660
    Abstract: Provided are an objective lens driving device capable of strengthening the effective magnetic fluxes of the magnets while preventing increases in size and costs of the device; and an optical pickup apparatus including the same. The objective lens driving device of the invention includes an actuator frame for movably supporting an OBL holder. Four tracking coils are attached to sidewalls of the OBL holder, and four magnets are attached to the back yokes of the actuator frame to be opposed to the tracking coils, respectively. In addition, two of the tracking coils are placed tilting to one of the sidewalls of the OBL holder.
    Type: Grant
    Filed: September 25, 2012
    Date of Patent: December 3, 2013
    Assignee: SANYO Electric Co., Ltd.
    Inventors: Shunichi Morimoto, Shingo Matsuzaki
  • Patent number: 8593743
    Abstract: The subject matter disclosed herein relates to electromagnetic force generation for an imaging device having a small form factor.
    Type: Grant
    Filed: July 19, 2011
    Date of Patent: November 26, 2013
    Assignee: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventors: Kin Ming Fan, Kwok Sing Cheng, Kai Cheong Kwan
  • Patent number: 8533749
    Abstract: A mounting structure of a magnetic member at least includes: a magnetic member; a magnetic coupling member mounted with the magnetic member; and an adhesive member bonding the magnetic member to the magnetic coupling member, either one or both of the magnetic member and the magnetic coupling member provided with an adhesion securing portion configured to secure adhesive strength, either one or both of the magnetic member and the magnetic coupling member provided with an adhesive member reservoir portion configured to lead the adhesive member to the adhesion securing portion.
    Type: Grant
    Filed: October 22, 2012
    Date of Patent: September 10, 2013
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Shunichi Morimoto, Kenichi Imai
  • Patent number: 8422351
    Abstract: An optical disc apparatus records information onto plural disc shaped mediums of different standards or reproduces information from the plural disc shaped mediums. The optical disc apparatus includes an optical pickup equipped with a spherical aberration correcting unit using a movable lens, and a disc insertion unit for inserting and ejecting the disc shaped mediums. The spherical aberration correcting unit starts the movement of the movable lens to an initial position while the disc insertion unit inserts or ejects the disc shaped medium. As such, the present invention discloses the optical disc apparatus with a reduced disc recognition time for improving user convenience and a driving method thereof.
    Type: Grant
    Filed: September 27, 2006
    Date of Patent: April 16, 2013
    Assignees: Hitachi, Ltd., Hitachi-LG Data Storage, Inc.
    Inventor: Hideki Maruyama
  • Patent number: 8255936
    Abstract: An objective lens drive apparatus configured to drive an objective lens that focuses a laser beam on an optical disk is disclosed, the apparatus including a holding member that holds the objective lens; at least one pair of drive magnets arranged to face each other at opposite sides of the holding member with respect a tangential direction that is parallel to a tangential line of the optical disk, the drive magnets having protruding end portions that protrude from each side of the holding member with respect to a tracking direction that is parallel to a radial direction of the optical disk; and plural drive coils configured to drive the holding member through interaction with the drive magnets, at least one of the drive coils being arranged on each side of the drive magnets with respect to the tangential direction.
    Type: Grant
    Filed: December 4, 2007
    Date of Patent: August 28, 2012
    Assignee: Ricoh Company, Ltd.
    Inventors: Goichi Akanuma, No-Cheol Park, Dong-Ju Lee, Myeong-Gyu Song, Yang-Hyun Seok
  • Patent number: 8220012
    Abstract: A holding member provided with a coil comprising a proximity facilitating portion capable of bringing the coil closer to a magnetic member facing the coil.
    Type: Grant
    Filed: April 15, 2010
    Date of Patent: July 10, 2012
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Kenichi Imai, Shunichi Morimoto
  • Patent number: 8166495
    Abstract: An optical pickup in which the position of a magnet can be adjusted with respect to a yoke is provided. The optical pickup has an objective lens, a lens holder that holds the objective lens, a magnet disposed opposite to a side surface of the lens holder, and a yoke to the inside of which the magnet is attached. The yoke has an opening at least near the bottom of the magnet, through which the magnet can be visually observed from the outside of the yoke, the bottom being on the side of the yoke that is farther from an optical disc and the top being on the side of the yoke that is closer to the optical disc along the optical axis of the objective lens.
    Type: Grant
    Filed: January 29, 2007
    Date of Patent: April 24, 2012
    Assignee: Hitachi Media Electronics Co., Ltd.
    Inventors: Katsuhiko Kimura, Hidenao Saito, Jun Hato, Takahiro Yamaguchi
  • Patent number: 8111593
    Abstract: An objective lens drive and an optical pickup apparatus are provided which can be reduced in size. Two tilt coils and two tracking coils are disposed so that among planes defined by the respective coils, a plane perpendicular to a winding direction thereof is parallel to a reference plane defined on a lens holder at a predetermined reference distance or less, and are disposed at such positions as to be symmetrical to each other about a center of gravity of the lens holder. A focus coil is disposed so that among planes defined by the focus coil, a plane perpendicular to a recording surface of an optical disk is parallel to the reference plane at a predetermined reference distance or less relative to the two tilt coils and the two tracking coils.
    Type: Grant
    Filed: October 24, 2008
    Date of Patent: February 7, 2012
    Assignee: Sharp Kabushiki Kaisha
    Inventor: Shinichi Sako
  • Patent number: 8040763
    Abstract: An objective lens driving device includes a lens holder (3) holding an objective lens (1, 2), a stationary part (5) that supports the lens holder (3) via wires (7a, 7b), an electromagnetic coil (11a-11d, 12a-12d) provided on the lens holder, and a magnet (4a, 4b) provided on the stationary part and magnetized in a multipolar manner so that different magnetic pole surfaces are arranged on a surface of the magnet facing the electromagnetic coil. The lens holder has a convex portion (16a-16d, 17a-17d) on a surface thereof facing the magnet. The convex portion has at least one groove (601-604, 701-704) portion extending parallel to a direction of magnetic flux lines of the magnet facing the convex portion, and at least a surface of the convex portion is formed of material having magnetic property.
    Type: Grant
    Filed: September 1, 2008
    Date of Patent: October 18, 2011
    Assignee: Mitsubishi Electric Corporation
    Inventors: Toshiya Matozaki, Nobuo Takeshita
  • Patent number: 8040621
    Abstract: A miniature magnetic-levitated lens driving device includes a lid, a casing, a lens module, a plate spring, and a magnetic-levitated module. The lid has a hollow structure and is coupled to the casing. The casing is formed therein with a receiving space. The lens module is provided in the receiving space. The plate spring is fixed between the lid and the casing and configured to resiliently confine the lens module to the receiving space. The magnetic-levitated module is provided in the receiving space and corresponds in position to the lens module. A magnetic repulsive force is produced by and between the magnetic-levitated module and the lens module, and in consequence the lens module is magnetically suspended in the receiving space formed by the lid and the casing, so as to save power, and minimize friction and microparticles.
    Type: Grant
    Filed: January 22, 2010
    Date of Patent: October 18, 2011
    Assignee: PowerGate Optical Inc.
    Inventors: Chi Lone Chang, Chuan Yu Hsu, Wen Tsai Hsu, Chi Tai Meng
  • Patent number: 8037488
    Abstract: This invention aims at reducing a rolling moment generated in coils mounted to lens holder side face without losing drive forces in a focusing direction and tracking direction in an objective lens drive of an optical pickup device. By shifting a coil line portion near the objective lens of two coil line portions substantially parallel to the tracking direction of the first coil in a direction departing from a lens optical axis, increase and decrease in drive forces generated in right and left first coils when the lens holder is moved in the tracking direction cancel each other so as to eliminate imbalance between the right and left drive forces.
    Type: Grant
    Filed: September 26, 2006
    Date of Patent: October 11, 2011
    Assignee: Hitachi Media Electronics Co., Ltd.
    Inventors: Katsuhiko Kimura, Hidenao Saito, Jun Hato
  • Patent number: 8028310
    Abstract: An optical pickup includes a moving base moved in a radial direction of a disk-like recording medium mounted on a disk table, and an objective lens drive device disposed on the base and including an objective lens. The drive device includes a fixed block fixed to the base, a movable block including the lens and a lens holder and moved in focusing and tracking directions, supporting springs connecting the fixed and movable blocks, focusing magnets moving the movable block in the focusing direction, tracking magnets moving the movable block in the tracking direction and each having two magnetized poles, focusing coils facing the focusing magnets, and tracking coils facing the tracking magnets and spaced apart in the tracking direction. The north and south poles of the tracking magnet are adjacent in the tracking direction. The boundary between the poles is formed by a line segment not being one straight line.
    Type: Grant
    Filed: May 1, 2009
    Date of Patent: September 27, 2011
    Assignee: Sony Corporation
    Inventor: Satoshi Hayakawa
  • Patent number: 8009373
    Abstract: A lens actuator includes a cylindrical carrier having a hollow for accommodating a lens, the hollow being formed in a first direction; a driving yoke for housing the carrier; a base for holding the yoke thereon; a driving magnet and a driving coil, which are fixed either to the outer periphery of the carrier or the driving yoke; a moving magnet fixed to the driving yoke; and a moving coil fixed to the base. The carrier is movable with respect to the driving yoke in the first direction, and the driving yoke is movable with respect to the base in a second direction perpendicular to the first direction. The driving magnet and the driving coil face each other in the second direction, and the moving magnet and the moving coil face each other in the first direction.
    Type: Grant
    Filed: December 1, 2010
    Date of Patent: August 30, 2011
    Assignee: Panasonic Corporation
    Inventors: Norifumi Sata, Hidekazu Tanaka
  • Patent number: 7969828
    Abstract: An optical pickup actuator independently drivable in focusing, tilting and tracking directions. The optical pickup includes a lens holder movably installed on a base, and mounted with an objective lens for transmitting an incident light to an optical information recording medium; and a magnetic circuit to independently driving the lens holder in the focusing, tilting and tracking directions. The magnetic circuit includes opposing magnets; a focusing coil and tilting coils interposed between the magnets, mounted inside the lens holder, and wound around respective axes parallel to the focusing direction; and a plurality of tracking coils mounted outside the lens holder, interposed between the magnets and wound around respective axes transverse to the focusing direction. The magnetic fields of the magnets are guided by outer yokes partially encompassing the magnets and inner yokes positioned within the focusing coil and the tilting coils.
    Type: Grant
    Filed: April 13, 2006
    Date of Patent: June 28, 2011
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Seok-jung Kim, Moon-whan Lee, Do-hoan Nam, Jung-gug Pae, Soo-han Park
  • Patent number: 7932797
    Abstract: An electromagnetic drive includes a drive plate disposed in a magnetic field. The drive plate includes a non-conductive medium with a first plurality of linear conductive elements arranged parallel to a first axis. The first plurality of linear conductive elements connects first and second electrical terminals supported by the non-conductive medium. The drive plate may be driven in the magnetic field along a second axis that is substantially perpendicular to the first axis when an electrical current of sufficient magnitude is passed through the first plurality of linear conductive elements.
    Type: Grant
    Filed: October 17, 2007
    Date of Patent: April 26, 2011
    Assignee: Harman Becker Automotive Systems GmbH
    Inventors: Tsuneo Suzuki, Rolf Dupper
  • Patent number: 7924665
    Abstract: The pickup device includes: a fixed portion 11, a movable portion 12 movable in a tracking direction and a focus direction; linear resilient members 13A through 13D for connecting the fixed portion 11 and the movable portion 12; a coil 21 provided on the lateral side of the movable portion 12; and a flux providing unit 22 for providing a magnetic flux generating a translational force for driving a portion different from the center of gravity O of the movable portion 12 in the tracking direction in association with the coil 21 and a rotational force for rotating the movable portion 12 in a plane orthogonal to the focus direction, the flux providing unit 22 having an arrangement in which a torque generated by driving the portion different from the center of gravity with the translational force is counteracted by the rotational force.
    Type: Grant
    Filed: March 30, 2005
    Date of Patent: April 12, 2011
    Assignee: Pioneer Corporation
    Inventors: Jun Suzuki, Yasuhiro Ohira
  • Patent number: 7898752
    Abstract: An optical package is provided comprising a lens system, the lens system comprising an adjustable lens component, a plurality of magnetic elements, and a multi-directional lens flexure. The adjustable lens component is mechanically coupled to a lens mounting portion of the multi-directional lens flexure. The magnetic elements comprise at least one fixed magnetic element and at least one motive magnetic element. The arrangement of the fixed and motive magnetic elements relative to each other forms a first fixed/motive element pair and a second fixed/motive element pair. The motive magnetic element of each fixed/motive element pair is mechanically coupled to a motive portion of the multi-directional lens flexure.
    Type: Grant
    Filed: November 24, 2008
    Date of Patent: March 1, 2011
    Assignee: Corning Incorporated
    Inventors: Steven Joseph Gregorski, Matthew Patrick Hammond
  • Patent number: 7870572
    Abstract: An object lens driving apparatus (100) includes a lens holder (4) that holds an object lens (1) facing a recording medium and is so supported that the lens holder (4) is movable toward and away from the surface of the recording medium. A focusing coil (5) is fixed in the interior of the lens holder (4) so that the focusing coil (5) surrounds an optical axis of the object lens (1). By apply current to the focusing coil (5), a driving force is generated, which moves the lens holder (4) toward and away from the surface of the recording medium. By disposing the focusing coil (5) in the interior of the lens holder (4) so that the focusing coil (5) surrounds the optical axis of the object lens (1), a movable part of the object lens driving apparatus (100) can be reduced in size and weight, so that a high sensitivity can be accomplished.
    Type: Grant
    Filed: August 31, 2005
    Date of Patent: January 11, 2011
    Assignee: Mitsubishi Electric Corporation
    Inventors: Mitoru Yabe, Keiji Nakamura
  • Patent number: 7830759
    Abstract: An objective lens drive includes a lens holder holding first and second objective lenses and moved at least in a focusing direction substantially parallel to optical axes of the objective lenses and in a tracking direction orthogonal to the focusing direction; a support supporting the lens holder movably at least in the focusing and tracking directions; a first adjusting unit provided between the first objective lens and the lens holder and adjusting a tilt of the first objective lens in a direction about an axis in a first direction being any direction in a plane orthogonal to the focusing direction; and a second adjusting unit provided between the second objective lens and the lens holder and adjusting a tilt of the second objective lens in a direction about an axis in a second direction being in a plane orthogonal to the focusing direction and substantially orthogonal to the first direction.
    Type: Grant
    Filed: October 22, 2007
    Date of Patent: November 9, 2010
    Assignee: Sony Corporation
    Inventor: Muneyuki Horiguchi
  • Patent number: 7821727
    Abstract: A lens driving device, comprises a base; a casing fixed to the base; a coil bracket disposed within the casing; a coil wound on the coil bracket, a spring disposed within the casing, a drive rod; and a lens holder; wherein, one end of the spring is fixed to the base; one end of the drive rod is fixed to the other end of the spring, and the other end of the drive rod extends out of the casing. The lens holder is slidably fixed to the exposed portion of the drive rod. The lens holder is held stationary with respect to the drive rod by static friction between the drive rod and the lens holder. A driving signal may be applied to the coil to move the lens holder. The driving signal has the characteristic of making the current flowing through the coil slowly increase and then rapidly decrease, or to rapidly increase and then slowly decrease. The drive current is preferably a sawtooth pulse train, with each pulse causing movement of the lens holder in the micron range or below.
    Type: Grant
    Filed: January 30, 2009
    Date of Patent: October 26, 2010
    Assignee: Johnson Electric S.A.
    Inventors: Bin Shi, Hong Li, Xingquan Li
  • Patent number: 7810111
    Abstract: An optical pickup that can incline an objective lens in the same direction as that of a bend of an optical disc is provided. The optical pickup includes a lens holder that holds an objective lens, focusing coils attached to the lens holder, a yoke to which magnets are attached, and inner yokes disposed opposite to the magnets via the focusing coils, and the optical pickup is structured so that a cross-sectional area of the inner yoke disposed toward the outer periphery of the optical disc is greater than a cross-sectional area of the inner yoke disposed on the inner periphery of the optical disc.
    Type: Grant
    Filed: January 29, 2007
    Date of Patent: October 5, 2010
    Assignee: Hitachi Media Electronics Co., Ltd.
    Inventors: Katsuhiko Kimura, Jun Hato
  • Patent number: 7800985
    Abstract: An optical pickup device includes an objective lens (1) for focusing a light flux onto an information layer of a disk-shaped medium, an objective lens driving unit that drives the objective lens (1) in a focus servo direction and in a tracking servo direction, a correction lens (14) disposed on the same optical axis as the objective lens (1), and a correction lens driving unit that drives the correction lens (14) in the same direction as the focus servo direction to control the condition of the light flux incident on the objective lens.
    Type: Grant
    Filed: January 30, 2006
    Date of Patent: September 21, 2010
    Assignee: Mitsubishi Electric Corporation
    Inventors: Toshiya Matozaki, Nobuo Takeshita
  • Patent number: 7779433
    Abstract: An optical pick-up actuator includes a lens holder having tracking and focusing coils which substantially extend in two parallel planes at a side of the lens holder. A magnet system cooperates with the tracking and focusing coils and is arranged separately from the lens holder and extends beyond the planes. The coils are arranged for effecting tilt through cooperation with the magnet system and may be provided at each of two opposite sides of the lens holder.
    Type: Grant
    Filed: February 13, 2008
    Date of Patent: August 17, 2010
    Assignee: Koninklijke Philips Electronics, N.V.
    Inventors: Joannes Antonius van Rooij, Bart Hendriks, Jadranko Dovic, Bernardus Johannes Stinesen, Jacobus Cornelis Gerardus van der Sanden, Hendrik Josephus Goossens
  • Patent number: 7656756
    Abstract: An optical pickup actuator includes a lens holder on which tracking and focusing coils are attached, at least one of the coils being a polygon coil having at least two sides that are different in a length from each other, magnets disposed facing the coils, and a rotation preventing unit formed on the lens holder. The rotation preventing unit surface-contacts an inner surface of the polygon coil to prevent the polygon coil from being twisted.
    Type: Grant
    Filed: December 13, 2004
    Date of Patent: February 2, 2010
    Assignee: LG Electronics Inc.
    Inventor: Jeong Yeop Han
  • Patent number: 7652957
    Abstract: A lens driving mechanism eccentrically drives at least one lens or lens subunit, hereunder called a correcting lens, in a lens system constituting a taking lens unit in a plane perpendicular to an optical axis direction, and includes a movable frame holding the correcting lens, two coils fixed at a lens barrel where the taking lens unit is disposed, and magnetic circuit formation members generating a magnetic field crossing the coils that are disposed around the correcting lens when viewed in the optical axis direction of the taking lens unit. The members include at least two magnets and yokes disposed at each of the two coils for generating movement forces in different directions perpendicular to the optical axis. The yokes oppose the respective magnets. Either the magnets or the yokes are held by the movable frame, and the other of the magnets and yokes are secured to the lens barrel.
    Type: Grant
    Filed: May 17, 2005
    Date of Patent: January 26, 2010
    Assignee: Sony Corporation
    Inventor: Takuya Tsutsumi
  • Patent number: 7631322
    Abstract: A magnetic circuit, an optical pickup actuator, an optical recording and/or reproducing apparatus using the magnetic circuit, and method of the same, wherein the magnetic circuit includes a plurality of focus coil units each of which includes a first focus coil and a second focus coil, and a magnet including a plurality of magnet portions which interact with the plurality of focus coil units and each of which is polarized in a direction opposite to adjacent magnet portions thereamong. Here, electromagnetic forces act on the first and second focus coils in each focus coil unit in a same direction in response to focus driving signals and in opposite directions in response to tilt driving signals, with the first and second focus coils in each focus coil unit have different effective coil lengths.
    Type: Grant
    Filed: January 27, 2005
    Date of Patent: December 8, 2009
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Hyung-joo Kang, Byung-youn Song, Pyong-yong Seong, Dae-jong Jang
  • Patent number: 7619951
    Abstract: An optical pickup actuator, including a lens holder movably installed on a base, and mounted with an objective lens to transmit an incident light to an optical information recording medium, and a magnetic circuit to independently drive the lens holder in a focusing direction, a tilting direction and a tracking direction, respectively.
    Type: Grant
    Filed: December 23, 2005
    Date of Patent: November 17, 2009
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Seok-jung Kim, Hyung-hoon Kang, Jung-gug Pae, Young-man Ahn, Soo-han Park
  • Patent number: 7589938
    Abstract: To enable a read-write head to perform a fast and accurate track following, the invention proposes a read-write head (1), which exhibits: a first block (11) and a carrier (14) movably attached to the first block (11) carrying a read-write element, and at least one electromagnetic actuator device, with at least one electromagnetic element (8, 9) to generate magnetic forces, which are acting upon the carrier (14).
    Type: Grant
    Filed: December 16, 2003
    Date of Patent: September 15, 2009
    Inventor: Hans-Heinrich Gatzen
  • Patent number: 7567486
    Abstract: A slim type optical pick-up actuator is provided. The actuator including: a lens holder provided with an object lens mounted at a predetermined portion thereof, two or more focusing coils received in a receiving groove thereof, a tracking coil disposed on a front surface of the focusing coils, and a tilt coil disposed on a top of the focusing coils, and moving in 3-axis directions; a bipolar magnet disposed facing the coils; two or more unipolar magnets facing the bipolar magnet and having an opposite polarity to the bipolar magnet; a yoke plate having a bent inner yoke, the inner yoke having inner surfaces facing each other, on which the bipolar magnet and the two or more unipolar magnets are respectively attached; and a wire suspension supporting moving of the lens holder and electrically connected to the coils.
    Type: Grant
    Filed: November 10, 2004
    Date of Patent: July 28, 2009
    Assignee: LG Electronics Inc.
    Inventors: Chae Min Ju, In Ho Choi
  • Patent number: 7562372
    Abstract: An optical pickup is provided for driving objective lenses in focusing and radial directions. The pickup includes a movable member, and objective lenses at the center portion of the movable member. The pickup also includes coil blocks provided at two side portions of the movable member, and pairs of magnets flanking the coil blocks in a tangential direction perpendicular to the focusing and radial directions. Support members are attached to the side portions of the movable member, permitting the movable member to move in the focusing direction and the radial direction. Each coil block includes focusing and tracking coils for driving the movable member in the focusing direction and the radial direction. The center portion of the movable member, below which a reflector is arranged, is thinner than the side portions of the movable member.
    Type: Grant
    Filed: February 28, 2006
    Date of Patent: July 14, 2009
    Assignee: Fujitsu Limited
    Inventors: Satoshi Shimokawa, Kouichi Tezuka
  • Patent number: 7555761
    Abstract: An optical pick-up actuator is provided. The optical pick-up actuator includes a lens holder, a tracking coil, a focusing coil, and a magnet. The lens holder holds an objective lens. The tracking coil is wound with wire, is disposed at a central portion on both sides of the lens holder, and includes a horizontal width at a top thereof that is less than a horizontal width at a bottom thereof. The focusing coil is wound with wire, is disposed at a left and a right on both sides of the lens holder, and includes a horizontal width at a top thereof that is greater than a horizontal width at a bottom thereof. The magnet faces the tracking coil and the focusing coil.
    Type: Grant
    Filed: December 23, 2005
    Date of Patent: June 30, 2009
    Assignee: LG Electronics Inc.
    Inventors: In Ho Choi, Sam Nyol Hong, Jin A Kim, Young Joong Kim
  • Patent number: 7543312
    Abstract: An optical pickup device is provided with a plurality of object lens corresponding to various kinds of optical discs having different recording densities, in which the structure of the optical pickup device is simplified and the size of the optical pickup device is minimized. The optical pickup device comprises a bobbin including an upper surface, at which first and second object lenses are mounted, an opened lower surface, and a first and second side surfaces supported by a supporting unit, the first and second side surfaces being opposite to each other, a first focus coil and a first tracking coil mounted at a third side surface of the bobbin, a second focus coil and a second tracking coil mounted at a fourth side surface of the bobbin, which is opposite to the third side surface, and magnets disposed opposite to the first and second focus coils and the first and second tracking coils.
    Type: Grant
    Filed: June 20, 2006
    Date of Patent: June 2, 2009
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Seok Jung Kim, Yong Han Yoon, Soo Han Park, Jung Gug Pae
  • Patent number: 7540004
    Abstract: An ultra-small optical/magnetic head actuator includes: a swing arm movable in a horizontal direction (tracking direction) and a vertical direction (focusing direction) and having mounted thereon a head for reading and writing information on a disk. A tracking actuator moves the swing arm in the horizontal direction (tracking direction) and a pivot hinge adjusts a radius of rotation of the swing arm and guides the movement of the swing arm in the tracking direction. A focusing actuator moves the swing arm in the vertical direction (focusing direction), wherein the focusing actuator includes a focusing coil attached under the swing arm and a Halbach magnet array disposed under the focusing coil minimizes thickness. Friction or backlash can be avoided, and non-repetitive errors can be reduced. The thickness of the ultra-small storage device can be reduced due to the use of a Halbach magnet array.
    Type: Grant
    Filed: November 9, 2005
    Date of Patent: May 26, 2009
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Sung Q Lee, Kang Ho Park, Mun Cheol Paek, Kwang Yong Kang
  • Patent number: 7522358
    Abstract: An optical head device includes a lens holder, a wire support body which supports the lens holder through a plurality of wires, and a plate-like member on which the wire support body is mounted. The plate-like member includes a bottom plate part on which the wire support body is mounted and a rising part raised from the bottom plate part so as to face with a gap to a side face of the wire support body. The wire support body is subjected to surface bonding to the rising part with a first adhesive which is disposed within the gap and mounted on the plate-like member.
    Type: Grant
    Filed: August 18, 2004
    Date of Patent: April 21, 2009
    Assignee: Sankyo Seiki Mfg. Co., Ltd
    Inventors: Masanobu Harada, Manabu Sakamoto
  • Patent number: 7516464
    Abstract: Disclosed is an optical pickup device which is small, light, and thin and which is equipped with a tilt adjusting mechanism. A lens holding body holding an objective lens and a support body supporting the lens holding body so as to allow the lens holding body to move in the focusing direction and/or the tracking direction of the objective lens, are supported at two support points on a support body mounting surface of an optical base so as to be rotatable around an axis extending in a tangential direction of an optical disk.
    Type: Grant
    Filed: February 27, 2004
    Date of Patent: April 7, 2009
    Assignee: Canon Kabushiki Kaisha
    Inventor: Osamu Nagatsuka
  • Patent number: 7484229
    Abstract: An optical pick-up adapted to have ability to conduct a control so as to tilt a lens holder (2), including a supporting block (3) for movably supporting the lens holder in the focus direction and in the tracking direction, a supporting member (4) including a pair of leg pieces (41), (41) for supporting and allowing the supporting block to be tilted by fixing front end sides of these leg pieces onto a base (16), the leg pieces being arranged such that spacing between the leg pieces increases as a distance from a side at which the supporting block is supported increases toward the front end side, and a drive mechanism (5) for applying a drive force to the supporting block so as to tilt the supporting block by changing a shape of the pair of leg pieces, whereby tilting the lens holder which is supported by the supporting block.
    Type: Grant
    Filed: May 19, 2005
    Date of Patent: January 27, 2009
    Assignee: Sony Corporation
    Inventor: Takahiro Miyagi
  • Patent number: 7478411
    Abstract: An optical pickup actuator including a multi-conductive suspension. The optical pickup actuator may include a base, a holder fixed to the base, a bobbin holding an object lens and having a plurality of driving coils, and a plurality of suspensions connected between the bobbin and the holder and movably supporting the bobbin toward the holder, wherein each of the suspensions may be a multi-conductive suspension including a flexible substrate and a plurality of wires, formed on the flexible substrate, applying currents to the coils.
    Type: Grant
    Filed: September 15, 2005
    Date of Patent: January 13, 2009
    Assignee: Toshiba Samsung Storage Technology Korea Corporation
    Inventors: Byung-youn Song, Hyung-loo Kang, Sang-yol Yoon, Pyong-yong Seong, Young-won Lee
  • Patent number: 7441258
    Abstract: An objective lens drive device includes a drive mechanism for driving a lens holder at least in a focusing direction and a tracking direction. The drive mechanism includes a drive magnet provided with a magnetized opposing face in which different magnetic poles are disposed to be adjacent to each other via a magnetic pole boundary portion formed in a roughly U-shape. The drive mechanism also includes a tilt drive coil for driving the lens holder in a tilt direction and the tilt drive coil is opposedly disposed to the magnetized opposing face at a position where the tilt drive coil overlaps with at least a focusing drive coil or a tracking drive coil in a direction in which the focusing drive coil and the tracking drive coil face the magnetized opposing face.
    Type: Grant
    Filed: March 7, 2005
    Date of Patent: October 21, 2008
    Assignee: NIDEC Sankyo Corporation
    Inventors: Manabu Sakamoto, Tsuyoshi Yokouchi
  • Publication number: 20080163279
    Abstract: An optical pickup head and an electromagnetic actuating device thereof are provided. The electromagnetic actuating device is used to move an objective lens carrier having an objective lens assembly to form an optical pickup head. The electromagnetic actuating device includes at least a magnet, at least a coil, and at least a yoke. The magnet is spaced apart from the objective lens carrier by a distance, and the coil is disposed at the objective lens carrier, for generating an electromagnetic force to interact with the magnet. The yoke is spaced apart from the objective lens carrier by a distance, in which the yoke has a protruding part that extends towards the objective lens carrier and is used to attract magnetic flux lines produced by the magnet, and thus making the magnetic flux that passes through the coil be distributed evenly.
    Type: Application
    Filed: March 28, 2007
    Publication date: July 3, 2008
    Inventors: Ming-Tsan Peng, Chun-Te Wu, Chi-Shen Chang, Kwen-Jin Lee, Tzuan-Ren Jeng, Lei-Ming Yang, Chau-Yuan Ke, Jau-Jiu Ju, Shyh-Jier Wang, Hai-Jo Huang
  • Patent number: 7389519
    Abstract: An optical head includes a fixed part, a movable part movably held by a plurality of wires fixed on the fixed part, and magnets fixed to the fixed part. The movable part includes a movable-part housing, a heatsink held by the movable-part housing, a light emitting element and a light receiving element both mounted on the heatsink, magnets provided to both sides of the movable-part housing to contact the heatsink, an objective lens held by the movable-part housing to allow an emitted laser beam from the light emitting element to focus, and a diffraction grating provided between the objective lens and the light emitting element and between the objective lens and the light receiving element. The gap between each coil and the adjacent magnet is filled with ferrofluid having a higher thermal conductivity than the atmosphere.
    Type: Grant
    Filed: June 18, 2004
    Date of Patent: June 17, 2008
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kazuhiko Yamanaka, Takuya Okuda, Kazutoshi Onozawa
  • Patent number: 7385885
    Abstract: Disclosed is a magnetic circuit operable in multiple axes in an optical pick-up actuator. The optical pick-up actuator includes: a lens holder for receiving and moving an object lens in a predetermined direction; a magnetic circuit having; a plurality of coils series and parallel connected and attached to both sides of the lens holder; a yoke and a magnet faced with the coils, for generating and inducing different polarities in perpendicular directions. With such construction, the actuator moves the lens holder to tracking, focusing, tilting directions under control of a direction and intensity of a current by the magnetic circuit.
    Type: Grant
    Filed: April 21, 2003
    Date of Patent: June 10, 2008
    Assignee: LG Electronics Inc.
    Inventor: In Ho Choi
  • Patent number: 7379397
    Abstract: The invention provides an optical disc apparatus which restricts an operation sound generated from an objective lens driving portion of an optical pickup and has a reduce sound, in an optical disc apparatus, in particular, an optical disc apparatus installing a microphone for recording an external voice therein. Coils (107, 108), a magnet (109) and opposing surfaces of a yoke (110) are respectively arranged at substantially point symmetrical positions with respect to an optical axis (111) of an objective lens (103) in a state in which no electric current is applied, the yoke (110) and a unit base (117) are connected via a spring member (118), and the unit base (117) is mounted to a casing (120). In this case, the spring member (118) is connected at a position (121) forward apart from the objective lens (103) with respect to the yoke (110), and is formed so as to have at least a deformation freedom in a direction of the optical axis of the objective lens (103).
    Type: Grant
    Filed: June 14, 2006
    Date of Patent: May 27, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Hiromitsu Mori, Kyuichiro Nagai, Atsushi Inoue, Toshimasa Kamisada, Ryuichiro Mizuno
  • Patent number: 7376962
    Abstract: To reduce vibrations occurring in an objective lens driving apparatus there is provided an objective lens driving apparatus used in an optical pickup that reads/writes information from or onto an optical disk using an objective lens. The objective lens driving apparatus has a lens holder that holds an objective lens in a center part thereof, and a plurality of tracking coils that are disposed on both sides of the lens holder. The mass of a pair of first tracking coils that are disposed on one of the sides is greater than the mass of a pair of second tracking coils that are disposed on the other side.
    Type: Grant
    Filed: April 20, 2005
    Date of Patent: May 20, 2008
    Assignee: Hitachi Media Electronics Co., Ltd.
    Inventors: Katsuhiko Kimura, Junichi Senga
  • Patent number: 7340756
    Abstract: An optical pickup actuator having a flux shielding magnet, 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 holding the objective lens; coils installed to the blade; and a base having a plurality of driving magnets interacting with a current flowing through the coils and generating a force that drives the blade in a predetermined direction, a shielding magnet arranged opposite to, and having a same polarity facing at least one of the driving magnets, the shielding magnet blocking leakage of magnetic flux from the driving magnets, and a holder having a surface to which the shielding magnet is attached and to which the blade is movably attached.
    Type: Grant
    Filed: September 2, 2003
    Date of Patent: March 4, 2008
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Myung-sik Kwon, Jung-gug Pae
  • Publication number: 20080052735
    Abstract: An optical device. A first yoke is connected to a support base. A second yoke is connected to the support base and opposes the first yoke. A lens module is movably disposed in the support base and between the first and second yokes. At least one magnetic member is comnected to the lens module and disposed between the first and second yokes. A coil is connected to the support base and disposed between the first and second yokes. The coil surrounds the magnetic member and lens module and is separated from the magnetic member. At least one elastic suspension rod is connected to the support base and lens module, supporting the lens module.
    Type: Application
    Filed: November 2, 2006
    Publication date: February 28, 2008
    Applicant: LITE-ON TECHNOLOGY CORPORATION
    Inventors: Yu Chien Huang, Mu Hsuian Cheng, Tzu Kan Chen, Hsu Ting Cheng, Chia Hsi Tsai