Optical recording/reproducing system

Details Optical recording/reproducing system Optical recording/reproducing system

1982-03-29

1985-07-16

Faber, Alan

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

250201, 346 76L, G11B 700

Patent

active

045300801

ABSTRACT:
A simple heat mode optical recording system uses a laser beam comprised of a first laser beam and a second laser beam. The energy density of each beam is less than the threshold level for effecting the recording data on a recording medium, but the sum of the energy density of the two beams exceeds the threshold level. The second beam functions to pre-heat the recording medium, and is implemented by a powerful inexpensive LED laser, and the first beam functions to write and/or read data and has a sharp area to increase the storage capacity. Those two beams are focused on the recording medium by using a single focusing control means.

REFERENCES:
patent: 3902010 (1975-08-01), Goshima
patent: 3932700 (1976-01-01), Snopko
patent: 3969575 (1976-07-01), Gerritsen
patent: 4383261 (1983-05-01), Goldberg
patent: 4399529 (1983-08-01), Leterme

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