Acousto-optical intensity control of laser beam during etching of optical servo information of magnetic media
June 10, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3875024 Method and apparatus for recording on a disk supported deformable metallic film Method for manufacturing optical type recording medium Optical servo for magnetic disks Method and apparatus for recording disk servo information with detachable position decoder Magnetic media containing reference feature and methods for referencing magnetic head position to the reference feature Magnetic information media storage with optical servo tracks Method and apparatus for optically/acoustically monitoring laser materials processing High track density magnetic media with pitted optical servo tracks and method for stamping the tracks on the media Patent #: 5067039 InventorsAssigneeApplicationNo. 896196 filed on 06/10/1992US Classes:264/1.33, Optical recording medium219/121.61, Beam energy control219/121.69, Methods264/40.1, WITH MEASURING, TESTING, OR INSPECTING264/400LASER ABLATIVE SHAPING OR PIERCING (I.E., NONETCHING, DEVOID OF CHEMICAL AGENT OTHER THAN AIR)ExaminersPrimary: Lowe, JamesAttorney, Agent or FirmForeign Patent References
International ClassesB23K 026/10G11B 007/26 B29D 017/00 AbstractThe intensity of a beam of light used to etch concentric servo tracks on a magnetic medium is adjusted with an acousto-optical device to maintain a substantially constant energy density delivered by the beam while the optics which generate the beam move radially of the disk.Other References
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