Objective lens with two numerical apertures for reading/writing

Details Objective lens with two numerical apertures for reading/writing Objective lens with two numerical apertures for reading/writing

1996-02-27

1998-04-07

Nelms, David C.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

369 4437, 369112, 369 4423, G11B 700, G02B 300

Patent

active

057372942

ABSTRACT:
An objective lens having at least two regions of different numerical apertures is configured for focusing a light beam through the regions of the different numerical apertures on two different signal recording surfaces of at least two optical discs having light transmitting layers of different thicknesses. Since the objective lens is integrally formed by at least two lens portions, a light beam outgoing from a common light source is focused on signal recording surfaces of at least two optical discs having the light transmitting layers of different thicknesses.

REFERENCES:
patent: 5446565 (1995-08-01), Komma et al.
patent: 5471455 (1995-11-01), Jabr
patent: 5526338 (1996-06-01), Hasman et al.
patent: 5608715 (1997-03-01), Yokogawa et al.

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