Optical disk apparatus with a laser beam controllable in accorda

Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium

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369 54, 369 58, 369100, G11B 2018, G11B 2736, G11B 700

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active

051289202

ABSTRACT:
An optical disk apparatus for reproducing data from an optical disk having recording tracks emits a laser beam onto the optical disk and converts a reflection beam into an electric signal by an optical head. This electric signal is amplified by an amplifier. The amplifier signal is extracted by the envelope detector. The envelope signal is extracted in accordance with the amplified signal. The envelope signal is added with the amplified signal from the amplifier, and the resultant signal is converted into a binary signal by binary circuit.

REFERENCES:
patent: 4642803 (1987-02-01), Drexler
patent: 4792933 (1988-12-01), Suzuki
patent: 4870633 (1989-09-01), Matsushita et al.
patent: 4890274 (1989-12-01), Kaneko et al.
patent: 4961182 (1990-10-01), Saito et al.
patent: 4965692 (1990-10-01), Tanaka et al.
patent: 4972399 (1988-09-01), Miyasaka
Translation, German Patent Office Action for application Ser. No. p 39 13 992.1-53, dated Dec. 20, 1989.

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