# US 8,752,078 B1 · Objective lens driving unit, and optical pickup device and optical disc drive including the objective lens driving unit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,752,078 B1 - Document ID: US8752078B1 - Status: Granted - Kind: B1 - Application number: 13/680,015 - Filed: 2012-11-17 - Published: 2014-06-05 - Granted: 2014-06-10 - Earliest claimed: 2012-01-31 - Assignees: Toshiba Samsung Storage Technology Korea Corporation - Applicants: Toshiba Samsung Storage Technology Korea Corporation - Inventors: Young-bin Lee; Min-soo Kang; Jae-kuon Yun - Web page: https://patentgrep.com/patent/US8752078B1 ## CPC - G11B 7/1374: Objective lenses {(optical objectives per se G02B9/00)} - G11B 7/0933: {Details of stationary parts} - G11B 7/0932: {Details of sprung supports} - G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R) ## Abstract Provided is an objective lens driving unit that includes a moving structure including an objective lens and a driving coil, a yoke and a fixed portion extending from the yoke, and a wire holder that has a first surface and a second surface that is adjacent to the first surface. The fixed portion of the yoke is integrally bonded to the first surface, and a terminal unit comprising a plurality of interconnection layers is embedded on the second surface. The objective lens driving unit also includes a plurality of suspension wires that connect the driving coil to the terminal unit of the wire holder. ## Claims ### Claim 1 An objective lens driving unit for an optical disc drive, the objective lens driving unit comprising: a moving structure comprising an objective lens and a driving coil; a yoke structure comprising a magnet corresponding to the driving coil, a yoke supporting the magnet, and a fixed portion extending from the yoke; a wire holder comprising a first surface and a second surface that is adjacent to the first surface, wherein the fixed portion of the yoke structure is integrally bonded to the first surface by molding, and a terminal unit comprising a plurality of interconnection layers is embedded in the second surface; and a plurality of suspension wires that connect the driving coil to the terminal unit of the wire holder, wherein an opening is formed on the first surface of the wire holder in which the fixed portion of the yoke structure is embedded and the opening exposes the fixed portion. ### Claim 2 (depends on 1) The objective lens driving unit of claim 1, wherein the interconnection layers comprise an interconnection layer for grounding which extends toward a corner between the first surface and the second surface of the wire holder, and a protruding portion which extends from the fixed portion of the yoke structure exposed through the opening to the interconnection layer for grounding and is electrically connected to the interconnection layer for grounding. ### Claim 3 (depends on 2) The objective lens driving unit of claim 2, wherein the protruding portion extends from the center of an edge of the fixed portion. ### Claim 4 (depends on 2) The objective lens driving unit of claim 2, further comprising a protection cover that protects the moving structure and which is electrically connected to the interconnection layer for grounding. ### Claim 5 (depends on 2) The objective lens driving unit of claim 2, wherein the interconnection layer for grounding is located at the center of the second surface and the other interconnection layers are disposed on both sides of the interconnection layer for grounding. ### Claim 6 (depends on 1) The objective lens driving unit of claim 1, wherein the interconnection layers are directly embedded and fixed in the second surface of the wire holder. ### Claim 7 An objective lens driving unit for an optical disc drive, the objective lens driving unit comprising: a moving structure comprising an objective lens and a driving coil; a yoke structure comprising a magnet corresponding to the driving coil, a yoke supporting the magnet, and a fixed portion extending from the yoke; a wire holder comprising a first surface and a second surface that is adjacent to the first surface, wherein the fixed portion of the yoke structure is integrally bonded to the first surface by molding, and a terminal unit comprising a plurality of interconnection layers is embedded in the second surface; and a plurality of suspension wires that connect the driving coil to the terminal unit of the wire holder, wherein the terminal unit comprises a terminal substrate that is embedded and fixed in the wire holder, and the interconnection layers are formed on the terminal substrate. ### Claim 8 An optical pickup device comprising: a moving structure comprising an objective lens and a driving coil; a static structure comprising: a yoke structure comprising a magnet corresponding to the driving coil, a yoke supporting the magnet, and a fixed portion extending from the yoke, a wire holder comprising a first surface and a second surface that is adjacent to the first surface, wherein the fixed portion of the yoke structure is integrally formed by molding on the first surface and a terminal unit comprising a plurality of interconnection layers is embedded in the second surface, and a plurality of suspension wires connecting the driving coil to the interconnection layers; and a base that supports the static structure and which comprises a light source and a light-receiving device, wherein an opening is formed on the first surface of the wire holder in which the fixed portion of the yoke structure is embedded and the opening exposes the fixed portion. ### Claim 9 (depends on 8) The optical pickup device of claim 8, wherein the interconnection layers comprise an interconnection layer for grounding which extends toward a corner between the first surface and the second surface of the wire holder, and a protruding portion which extends from the fixed portion of the yoke structure exposed through the opening to the interconnection layer for grounding at the corner and which is electrically connected to the interconnection layer for grounding. ### Claim 10 (depends on 9) The optical pickup device of claim 9, wherein the protruding portion extends from the center of an edge of the fixed portion. ### Claim 11 (depends on 10) The optical pickup device of claim 10, wherein the fixed portion is fixed on the second surface of the wire holder which is adjacent to the first surface, and the protruding portion of the fixed portion is electrically connected to the interconnection layer for grounding through a corner between the first surface and the second surface. ### Claim 12 (depends on 8) The optical pickup device of claim 8, wherein the terminal unit comprises a terminal substrate that is embedded and fixed in the wire holder, and the interconnection layers are formed on the terminal substrate. ### Claim 13 (depends on 8) The optical pickup device of claim 8, wherein the interconnection layers are directly embedded and fixed in the second surface of the wire holder. ### Claim 14 (depends on 8) An optical disc drive comprising the optical pickup device of claim 8. ### Claim 15 (depends on 14) The optical disc drive of claim 14, wherein a protruding portion extends from the center of an edge of the fixed portion. ### Claim 16 (depends on 15) The optical disc drive of claim 15, wherein the protruding portion of the fixed portion is electrically connected to the interconnection layer for grounding through a corner between the first surface and the second surface. ### Claim 17 (depends on 14) The optical disc drive of claim 14, wherein the terminal unit comprises a terminal substrate that is embedded and fixed in the wire holder, and the interconnection layers are formed on the terminal substrate. ### Claim 18 An objective lens driving device for an optical disc drive, the device comprising: a wire holder comprising a first surface and a second surface that is adjacent to the first surface; a terminal unit comprising a plurality of interconnection layers, the terminal unit configured to be embedded in the second surface; and a yoke configured to support a magnet, driving coil, and objective lens of the driving device, to be integrally bonded to the first surface of the wire holder by molding, and to extend beyond the second surface of the wire holder and make contact with one of the interconnection layers of the terminal unit.