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Priority to JP1988051437UpriorityCriticalpatent/JPH0626973Y2/ja
Priority to KR2019890004620Uprioritypatent/KR940006541Y1/ko
Publication of JPH01154523UpublicationCriticalpatent/JPH01154523U/ja
Application grantedgrantedCritical
Publication of JPH0626973Y2publicationCriticalpatent/JPH0626973Y2/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