Apparatus for erasing information on a reversible optical record

Details Apparatus for erasing information on a reversible optical record Apparatus for erasing information on a reversible optical record

1985-03-18

1987-12-08

Richardson, Robert L.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 99, 369100, 369112, G11B 700

Patent

active

047122072

ABSTRACT:
An optical system is described for use in processing information on a surface of an erasable record disc. The system decreases erasure time by forming an elongated spot from the generally circular cross section of a collimated laser beam so as to provide increased illumination time to an area recorded on the disc. The system includes a source of collimated light having a generally circular cross section, a cylindrical lens for focusing one aspect of the collimated light at a finite distance f, and a beam expander having the principal plane of its input lens at the distance f from the cylindrical lens, where the light forms a beam waist. An objective lens focuses the expanded elongated beam to a diffraction spot on the surface of the record disc. A linear actuator, such as a voice coil, responds to a control signal to position the cylindrical lens in the path of the collimated light beam for the erasing process, or out of the light path for the recording process.

REFERENCES:
patent: 3851951 (1974-12-01), Eveleth
patent: 4097895 (1978-06-01), Spong
patent: 4216501 (1980-08-01), Bell
patent: 4403318 (1983-09-01), Nagashima et al.
patent: 4425570 (1984-01-01), Bell et al.
patent: 4472748 (1984-09-01), Kato et al.
A. A. Latwach and B. W. Siryj, "Evaluation of Erasable Optical Recorder Materials," S.P.I.E. Conf., Washington, D.C., Jun. 6, 1983.
M. Takenaga et al., "New Optical Erasable Medium Using Tellurium Suboxide Thin Film," abstract and nine figures.

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