MAGNETO-OPTICAL DISK DEVICE

PURPOSE:To reproduce an overwritten signal positively using a magneto-optical disk device which is capable of overwriting freely. CONSTITUTION:This device is provided with an optical head 2 for outputting signals P1, P2, and PBRF based on the already recording signal of a magneto- optical disk, a tr...

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Bibliographic Details
Main Authors NARAOKA KOJI, IWATA AKIO, HOTSUTA HIROKI, HIGO NOBUTSUGU
Format Patent
LanguageEnglish
Published 07.10.1994
Edition5
Subjects
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
PHYSICS
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Summary:PURPOSE:To reproduce an overwritten signal positively using a magneto-optical disk device which is capable of overwriting freely. CONSTITUTION:This device is provided with an optical head 2 for outputting signals P1, P2, and PBRF based on the already recording signal of a magneto- optical disk, a tracking error signal generation circuit 3 for generating a tracking error signal TE based on the signal P1 and P2, and a linear motor 4 and a tracking actuator coil 5 for driving the optical disk 2 in tracking direction based on the error signal TE, thus outputting a reproduction signal PBD after performing a specific treatment to the signal PBRF. Then, it also consists of a reproduction signal processing circuit 6 for outputting a state signal EC for indicating the reproduction state of an already recorded signal, an error amplifier 7 for adding a tracking offset signal TOF to the error signal TE, and an MPU 8 for controlling so that the offset signal TOF is generated and then the specific reproduction signal PBD from the reproduction signal processing circuit 6 can be obtained by varying the amount according to the state signal EC.
Bibliography:Application Number: JP19930068517