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Priority to JP28501185ApriorityCriticalpatent/JPS62143233A/ja
Publication of JPS62143233ApublicationCriticalpatent/JPS62143233A/ja
Publication of JPH0439741B2publicationCriticalpatent/JPH0439741B2/ja
Method and apparatus for detecting the focusing state and positioning accuracy of a light beam directed onto an optical disk tracking guide in an optical recording system