Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1986-04-21
1989-05-23
Faber, Alan
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
369124, 369128, 369 54, 369110, 360114, G11B 1304, G11B 2024
Patent
active
048336629
ABSTRACT:
A reproduction apparatus for an optical magnetic disk having data recorded in a magneto-optical recording form and an address recorded in an optical recording form, includes a pickup for detecting P- and S-axis components of a linearly polarized laser beam reflected on an optical magnetic disk, an adder for adding the P- and S-axis components, and a subtracter for subtracting the S-axis component from the P-axis component. A reproduction signal processing circuit confines an output of the adder and that of the subtracter to produce a reproduction signal. A comparator converts the reproduction signal into a binary signal, the reproduction signal processing circuit including a circuit for identifying whether a reproduction signal is one of magneto-optical recording information or one of optical recording information. A variable gain amplifier amplifies the subtraction signal of the P- and S-axis components, at an amplification factor corresponding to a result of identification, in which the reproduction signal of optical recording information has a greater amplification factor than the amplification factor of the reproduction signal for magneto-optical recording information.
REFERENCES:
patent: 4169219 (1979-09-01), Beard
patent: 4417290 (1983-11-01), Tanaka et al.
patent: 4472748 (1984-09-01), Kato et al.
patent: 4587644 (1986-05-01), Fujiie
patent: 4663751 (1987-05-01), Kaku et al.
Denshi Tsushin Gakkai, Gijutsu Kenkyu Hokoku, vol. 83, No. 197, Nov. 25, 1983.
Faber Alan
Nguyen Hoa T.
Olympus Optical Co,. Ltd.
LandOfFree
Reproduction apparatus for a magneto-optical recording medium does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Reproduction apparatus for a magneto-optical recording medium, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reproduction apparatus for a magneto-optical recording medium will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1735512