# US 7,411,751 B2 · Optical pickup actuator > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,411,751 B2 - Document ID: US7411751B2 - Status: Granted - Kind: B2 - Application number: 11/257,064 - Filed: 2005-10-25 - Published: 2006-04-27 - Granted: 2008-08-12 - Earliest claimed: 2004-10-26 - Assignees: LG Electronics Inc. - Inventors: Jung Eung Park; Ho Chul Ryu; Sam Nyol Hong - Web page: https://patentgrep.com/patent/US7411751B2 ## CPC - G11B 7/0933: {Details of stationary parts} - 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 optical pickup actuator for writing/reading data in/from an optical storage medium. The optical pickup actuator includes a heat sink member or a heat conductive material for minimizing a bad influence of heat generated from a coil. ## Claims ### Claim 1 An optical pickup actuator comprising: a lens holder holding an object lens; a coil formed in a side of the lens holder; a magnet spaced apart from and faced by the coil such that the coil is disposed between the lens holder and the magnet; a pickup base supporting the magnet; a fixed frame fixed to the pickup base; an elastic support having one end fixed to the fixed frame and the other end fixed to the lens holder; and a heat sink member formed on the magnet and configured to dissipate heat generated by the coil and transferred to the magnet, wherein the coil is formed directly adjacent to the lens holder such that the heat generated by the coil is transferred to the lens holder, and then the heat transferred to the lens holder is transferred to the magnet and is dissipated by the heat sink member formed on the magnet. ### Claim 2 (depends on 1) The optical pickup actuator according to claim 1, wherein the heat sink member is coated on an upper surface of the magnet. ### Claim 3 (depends on 1) The optical pickup actuator according to claim 1, wherein the heat sink member has a higher thermal emissivity than the magnet. ### Claim 4 (depends on 1) The optical pickup actuator according to claim 1, wherein the heat sink member has a higher thermal conductivity than the magnet. ### Claim 5 (depends on 1) The optical pickup actuator according to claim 1, wherein the heat sink member is formed of anodized aluminum. ### Claim 6 (depends on 1) The optical pickup actuator according to claim 1, wherein the heat sink member is formed of black or white lacquer. ### Claim 7 An optical pickup actuator comprising: a lens holder holding an object lens; a coil formed in a side of the lens holder; a magnet spaced apart from and faced by the coil such that the coil is disposed between the lens holder and the magnet; a pickup base supporting the magnet; a fixed frame fixed to the pickup base; an elastic support having one end fixed to the fixed frame and the other end fixed to the lens holder; and a heat conductive material formed on one surface of the magnet facing the coil and configured to dissipate heat generated by the coil and transferred to the magnet, wherein the coil is formed directly adjacent to the lens holder such that the heat generated by the coil is transferred to the lens holder, and then the heat transferred to the lens holder is transferred to the magnet and is dissipated by the heat sink member formed on the magnet. ### Claim 8 (depends on 7) The optical pickup actuator according to claim 7, further comprising a heat sink member formed on the magnet. ### Claim 9 (depends on 8) The optical pickup actuator according to claim 8, wherein the heat sink member is coated on an upper surface of the magnet. ### Claim 10 (depends on 8) The optical pickup actuator according to claim 8, wherein the heat sink member has a higher thermal emissivity than the magnet. ### Claim 11 (depends on 8) The optical pickup actuator according to claim 8, wherein the heat sink member has a higher thermal conductivity than the magnet. ### Claim 12 (depends on 8) The optical pickup actuator according to claim 8, wherein the heat sink member is formed of anodized aluminum. ### Claim 13 (depends on 8) The optical pickup actuator according to claim 8, wherein the heat sink member is formed of black or white lacquer. ### Claim 14 (depends on 7) The optical pickup actuator according to claim 7, wherein the heat conductive material is coated on the magnet. ### Claim 15 (depends on 7) The optical pickup actuator according to claim 7, wherein the heat conductive material has a higher thermal conductivity than the magnet. ### Claim 16 An optical pickup actuator comprising: a movable unit including a lens holder for holding an object lens attached thereto and a coil formed therein to follow an optical medium when a current is applied thereto; and a stationary unit supporting the movable unit and including a magnet formed therein to generate a magnetic field, wherein the coil is disposed between the lens holder and the magnet, wherein the stationary unit further includes a heat sink member formed on an upper surface of the magnet for dissipating heat generated by the coil and transferred to the magnet, and wherein the coil is formed directly adjacent to the lens holder such that the heat generated by the coil is transferred to the lens holder, and then the heat transferred to the lens holder is transferred to the magnet and is dissipated by the heat sink member formed on the magnet. ### Claim 17 (depends on 16) The optical pickup actuator according to claim 16, wherein the heat sink member has a higher thermal emissivity than the magnet. ### Claim 18 (depends on 16) The optical pickup actuator according to claim 16, wherein the stationary unit further includes a heat conductive material for absorbing and dissipating the heat generated at the coil. ### Claim 19 (depends on 18) The optical pickup actuator according to claim 18, wherein the heat conductive material is formed on one surface of the magnet facing the coil. ### Claim 20 (depends on 1) The optical pickup actuator according to claim 1, wherein the coil includes a tracking coil and a focusing coil in which the tracking coil and the focusing coil are disposed in a same plane in the side of the lens holder. ### Claim 21 (depends on 7) The optical pickup actuator according to claim 7, wherein the coil includes a tracking coil and a focusing coil in which the tracking coil and the focusing coil are disposed in a same plane in the side of the lens holder. ### Claim 22 (depends on 16) The optical pickup actuator according to claim 16, wherein the coil includes a tracking coil and a focusing coil in which the tracking coil and the focusing coil are disposed in a same plane in the side of the lens holder.