Optical recording medium and optical recording/reproducing appar

Details Optical recording medium and optical recording/reproducing appar Optical recording medium and optical recording/reproducing appar

1990-07-24

1992-03-17

Envall, Jr., Roy N.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4424, 369118, G11B 700

Patent

active

050974645

ABSTRACT:
A data playback apparatus for reproduction of data from an optical recording medium which has a data layer disposed on a substrate thereof having a specific thickness is provided with an optical length corrector interposed between the recording medium and an objective lens for converging a light beam. The optical length corrector is selected so that the sum of the optical length of the substrate of the recording medium and the optical length of the optical length corrector equals a predetermined length for the objective lens. Accordingly, the light passing the objective lens can converge on the data layer developing a light spot close to the limit of refraction, regardless of the thickness of the substrate of the recording medium.

REFERENCES:
patent: 3999009 (1976-12-01), Bouwhuis
patent: 4725721 (1988-02-01), Nakamura et al.

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