Optical information recording and erasing method using two laser

Details Optical information recording and erasing method using two laser Optical information recording and erasing method using two laser

1988-11-17

1990-12-25

Richardson, Robert L.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369116, G11B 700

Patent

active

049808796

ABSTRACT:
A method for performing a high quality recording of information signals on an optical disk utilizes reversible structural changes between crystalline and amorphous states of a chalcogenide glass film or the like and two circular or nearly circular laser spots closely arranged along a recording track of optical disk. The preceding spot, which emits a continuous mode or high-frequency mode by far exceeding the recording frequency, operates cancel the past history in the irradiated portion by melting the recording film. The succeeding spot, which is modulated between the power levels for amorphizing and crystallizing according to the recorded information, operates to record new information signals on the track just after erased by the preceding laser spot.

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patent: 4564931 (1986-01-01), O'Hara et al.
patent: 4566088 (1986-01-01), Yoshida et al.
patent: 4710911 (1987-12-01), Yamada et al.
patent: 4718053 (1988-01-01), Sato et al.
patent: 4841514 (1989-06-01), Tsuboi et al.

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