Dual-layered optical disc and pickup head

Details Dual-layered optical disc and pickup head Dual-layered optical disc and pickup head

1996-06-06

1998-07-07

Tran, Thang V.

Dynamic information storage or retrieval

Systems having plural physically distinct independent tracks...

Having layered storage medium

3692751, G11B 700

Patent

active

057779694

ABSTRACT:
A dual-layered optical disc for use with a pickup head has a first signal layer, a semitransparent film, a space layer, a reflective film, and a second signal layer, all of which are deposited one upon the other in this order. A plurality of first signal pits are formed on one side of the first signal layer confronting the semitransparent film, while a plurality of second signal pits are formed on one side of the second signal layer confronting the reflective film. The first signal layer has a thickness selected so that when a read laser beam emitted from the pickup head is incident on the first signal layer in a direction generally perpendicular thereto, the focus position where the read laser beam is best focused is positioned within the space layer, thereby substantially equalizing jitters of signals played back from the first and second signal pits.

REFERENCES:
patent: 5625609 (1997-04-01), Latta et al.

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