Optical recording medium, master for optical recording...

Details Optical recording medium, master for optical recording... Optical recording medium, master for optical recording...

2007-11-20

2007-11-20

Young, Wayne (Department: 2627)

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

C369S277000

Reexamination Certificate

active

10845112

ABSTRACT:
To make a magneto-optical disk to have higher track density and enable stable tracking servo to be performed thereon. On an magneto-optical disk, a first groove Gv1, a second groove Gv2, and a third groove Gv3are formed so as to be adjacently arranged. The first groove Gv1and the second groove Gv2are deep grooves, and the third groove Gv3is a shallow groove. Data is recorded on six recording tracks of these three grooves and three lands between respective grooves. A CTS signal is obtained by a sum signal (A+B+C+D) of a photo-detector6, and a push-pull signal is obtained by a difference signal (A+D)−(B+C) of a photo-detector8.

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