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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 filedfiledCritical
Priority to JP1990065578UpriorityCriticalpatent/JPH087587Y2/ja
Priority to KR2019910009006Uprioritypatent/KR950000453Y1/ko
Publication of JPH0426479UpublicationCriticalpatent/JPH0426479U/ja
Application grantedgrantedCritical
Publication of JPH087587Y2publicationCriticalpatent/JPH087587Y2/ja
G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
G11B23/28—Indicating or preventing prior or unauthorised use, e.g. cassettes with sealing or locking means, write-protect devices for discs
G11B23/287—Indicating or preventing prior or unauthorised use, e.g. cassettes with sealing or locking means, write-protect devices for discs by mechanical lock
Landscapes
Engineering & Computer Science
(AREA)
Computer Security & Cryptography
(AREA)
Packaging Of Annular Or Rod-Shaped Articles, Wearing Apparel, Cassettes, Or The Like
(AREA)