Optical disc record medium, disc production method,...

Details Optical disc record medium, disc production method,... Optical disc record medium, disc production method,...

2006-11-10

2010-11-02

Young, Wayne R (Department: 2627)

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

C369S275300, C369S275400

Reexamination Certificate

active

07826319

ABSTRACT:
A guide groove is formed without wobbles. The guide groove is periodically modulated with its width. Encrypted data are recorded with marks formed on the record film along the guide groove. Information recorded by periodically modulating the guide groove with its width can be accurately detected by a band pass filter. Thus, rotation control information and address information can be stably reproduced. In addition, since the guide groove is formed without wobbles, a drive device having a pirated disc determination mechanism can reproduce encrypted content as with a ROM disc.

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