JPS6479985A - Disk device - Google Patents
Disk deviceInfo
- Publication number
- JPS6479985A JPS6479985A JP23846187A JP23846187A JPS6479985A JP S6479985 A JPS6479985 A JP S6479985A JP 23846187 A JP23846187 A JP 23846187A JP 23846187 A JP23846187 A JP 23846187A JP S6479985 A JPS6479985 A JP S6479985A
- Authority
- JP
- Japan
- Prior art keywords
- disk
- format
- detecting
- existing
- new
- 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
Links
Landscapes
- Indexing, Searching, Synchronizing, And The Amount Of Synchronization Travel Of Record Carriers (AREA)
Abstract
PURPOSE:To drive the title device with a simple electronic circuit and to prevent an image from being disturbed by providing a plural number of flag members for detecting a rotational phase in prescribed positions within an area of a central angle <180 deg. against the rotational center of a recording medium. CONSTITUTION:A PG yoke 103 at a center hub 102 and a PG yoke 104 in a position at the central angle 90 deg. are provided. When this disk is used to a reproducing device for exclusive use of the existing format, a PG detecting pulse is generated twice each time the disk rotates, and a discrepancy of the interval in length is generated so that abnormality is detected not to work a spindle servo, thus resulting in an impossibility of driving the device. Consequently, it is prevented that a disk recorded in a new format is reproduced by mistake in the existing system to output a disturbed image. On the other hand, in a system for both new and existing formats, by adding a simple circuit using a one shot multivibrator, one of the PG detecting pulses generated twice per rotation can be neglected to enable a disk for the new format only to be reproduced as well, and also the discrimination can be facilitated as to which format is applied.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23846187A JPS6479985A (en) | 1987-09-22 | 1987-09-22 | Disk device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23846187A JPS6479985A (en) | 1987-09-22 | 1987-09-22 | Disk device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6479985A true JPS6479985A (en) | 1989-03-24 |
Family
ID=17030571
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP23846187A Pending JPS6479985A (en) | 1987-09-22 | 1987-09-22 | Disk device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6479985A (en) |
-
1987
- 1987-09-22 JP JP23846187A patent/JPS6479985A/en active Pending
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