JPS643835A - Disk-shaped recording medium - Google Patents

Disk-shaped recording medium

Info

Publication number
JPS643835A
JPS643835A JP62156464A JP15646487A JPS643835A JP S643835 A JPS643835 A JP S643835A JP 62156464 A JP62156464 A JP 62156464A JP 15646487 A JP15646487 A JP 15646487A JP S643835 A JPS643835 A JP S643835A
Authority
JP
Japan
Prior art keywords
state
disk
erasing
carried out
information
Prior art date
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.)
Pending
Application number
JP62156464A
Other languages
Japanese (ja)
Inventor
Kazuo Hasegawa
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP62156464A priority Critical patent/JPS643835A/en
Publication of JPS643835A publication Critical patent/JPS643835A/en
Pending legal-status Critical Current

Links

Landscapes

  • Optical Record Carriers And Manufacture Thereof (AREA)

Abstract

PURPOSE:To prevent erasing of information by a malfunction by providing a display part which can be detected by a detecting means and can be changed to a state in which an erasing operation is not carried out and to a state in which the erasing is carried out. CONSTITUTION:A non-reflector 22 made of, for example, paper or cloth is stuck onto a reflecting part 21 which is a display part formed of a material to reflect light to an annular shape approximately concentrial with a disk 1 to change the display part from the 1st state to the 2nd state if the information required not to be erased is recorded on the disk 1. Then, a light receiving part in a photoelectric switch 31 detects the reflected light from a light projecting part discontinuously and the erasing operation is not carried out. The information is thus protected. The erasing is possible and the disk 1 is reusable if this non-reflector 22 is striped to change the display art from the 2nd state to the 1st state.
JP62156464A 1987-06-25 1987-06-25 Disk-shaped recording medium Pending JPS643835A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62156464A JPS643835A (en) 1987-06-25 1987-06-25 Disk-shaped recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62156464A JPS643835A (en) 1987-06-25 1987-06-25 Disk-shaped recording medium

Publications (1)

Publication Number Publication Date
JPS643835A true JPS643835A (en) 1989-01-09

Family

ID=15628320

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62156464A Pending JPS643835A (en) 1987-06-25 1987-06-25 Disk-shaped recording medium

Country Status (1)

Country Link
JP (1) JPS643835A (en)

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