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Priority to JP1990015110UpriorityCriticalpatent/JPH03106529U/ja
Priority to DE4104779Aprioritypatent/DE4104779A1/de
Priority to FR9101784Aprioritypatent/FR2659479A1/fr
Priority to CA002036412Aprioritypatent/CA2036412A1/en
Publication of JPH03106529UpublicationCriticalpatent/JPH03106529U/ja
G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector