Optical disc readout apparatus for different types of optical di

Details Optical disc readout apparatus for different types of optical di Optical disc readout apparatus for different types of optical di

1996-05-07

1999-01-05

Tran, Thang V.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369110, 369112, 369121, G11B 700

Patent

active

058569650

ABSTRACT:
An optical disc readout apparatus having an optical system which guides a laser beam onto a signal recording surface of a loaded disc through an objective lens and guides a reflected laser beam onto a photo detector. An effective numerical aperture of the objective lens is adjusted according to the thickness between a substrate surface of the loaded disc and the signal recording surface, and the laser spot with a diameter suitable to a recording density of the loaded disc is focused on the signal recording surface. Therefore, the data recorded in a plurality of optical discs with different thickness or recording densities can be read out.

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patent: 5621717 (1997-04-01), Finkelstein et al.
patent: 5627814 (1997-05-01), Lee

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