Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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Filing date
Publication date
Application filed by Matsushita Electric Industrial Co LtdfiledCriticalMatsushita Electric Industrial Co Ltd
Priority to JP50151447ApriorityCriticalpatent/JPS5922291B2/en
Publication of JPS5274306ApublicationCriticalpatent/JPS5274306A/en
Publication of JPS5922291B2publicationCriticalpatent/JPS5922291B2/en
PURPOSE:To make the tracing on information tracks accurate by using a light beam of a diameter slightly larger than a recording light beam at the time of reading information using a convergent light beam.