Optical recording medium recorded with information in depth...

Details Optical recording medium recorded with information in depth... Optical recording medium recorded with information in depth...

2006-01-24

2009-08-25

Hindi, Nabil Z (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S047100

Reexamination Certificate

active

07580329

ABSTRACT:
An optical disk has a lead-in region provided at the inner circumference side and a user region provided at the outer circumference side. Pit string3of pits of different depths is formed in the lead in region. Light beam reflected from the pit string is detected by detector and TPP and RF signals are output by differential amplifier and addition amplifier. A ternary signal is restored from pits based on the TPP and RF signals. Information is recorded by pits of the same depth in the user region. Recording information in the depth direction in the lead-in region increases the recording capacity thereof. The information recorded in the depth direction in the lead-in region cannot be transferred to a user region of another optical disk.

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