Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1985-10-17
1988-03-01
Cardillo, Raymond F.
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
369 44, 369110, 360114, G11B 1100
Patent
active
047291222
ABSTRACT:
In a magneto-optical reproducing head including first and second beam splitters (21, 22) and a Faraday effect member (25) between the splitters to suppress return to a laser beam source (11) of a reversed laser beam reversedly sent from a magneto-optical recording medium (12) on which a forward laser beam is incident, the second beam splitter is made to have a transmissivity of at least 0.5 for a p-polarized component. For an s-polarized component, the second beam splitter has a reflectivity which is substantially equal to unity as usual. In order to produce a servo control signal, a signal producing circuit (17) is made to receive an s-polarized component which is substantially totally reflected in the first beam splitter and into which the Faraday effect member converts the p-polarized component having reversedly passed through the second beam splitter. The transmissivity of the second beam splitter should preferably be at least 0.75 and not greater than 0.8. An optically active member (35) is preferably interposed between the Faraday effect member and either the first or the second beam splitter. The head is readily used in recording information on the recording medium and/or in erasing such information.
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Cardillo Raymond F.
NEC Corporation
Young Wayne R.
LandOfFree
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