PICKUP FOR PHOTOMAGNETIC RECORDING AND REPRODUCING DEVICE OF SIMULTANEOUS ERASING AND RECORDING TYPE

PICKUP FOR PHOTOMAGNETIC RECORDING AND REPRODUCING DEVICE OF SIMULTANEOUS ERASING AND RECORDING TYPE

PURPOSE:To use an auxiliary beam as monitor light at the recording time and use it as information light at the reproducing time by making the wavelength of a main beam irradiated on a recording area different from that of the auxiliary beam irradiated on the recording area and a non-recording area a...

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1. Verfasser: AKASAKA HIDEKI
Format: Patent
Sprache:eng
Schlagworte:
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
PHYSICS
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creator AKASAKA HIDEKI
description PURPOSE:To use an auxiliary beam as monitor light at the recording time and use it as information light at the reproducing time by making the wavelength of a main beam irradiated on a recording area different from that of the auxiliary beam irradiated on the recording area and a non-recording area and using polarized light as the auxiliary beam. CONSTITUTION:A polarized beam Bm reflected on a medium S includes the reflected light from a recorded part Po of a recording area Aw, and this reflected light has information recorded just now. A part of this reflected light Bm is used as the following monitor light which checks whether recording is performed correctly or not. At the reproducing time, the reflected light from the medium S of a main beam Bw is used as control light, and the reflected light from the medium S of the non-modulated auxiliary beam Bm is divided by a PBS 6, and obtained beams B'm and B''m are received by a photodetector 8b of the second photoelectric converting means 8 and are converted to electric signals, and the difference is operated to reproduce an information signal.
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subjects INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
PHYSICS
title PICKUP FOR PHOTOMAGNETIC RECORDING AND REPRODUCING DEVICE OF SIMULTANEOUS ERASING AND RECORDING TYPE
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