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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Telegraph and Telephone CorpfiledCriticalNippon Telegraph and Telephone Corp
Priority to JP5056077ApriorityCriticalpatent/JPS53135604A/en
Publication of JPS53135604ApublicationCriticalpatent/JPS53135604A/en
PURPOSE: To perform high-speed and high-accuracy access by tracking recording parts according to the intensity of the photo detecting signals of reference tracks of reflecting power or transmission different from that of recording tracks.