Light spot advancing direction judging device and method,...

Details Light spot advancing direction judging device and method,... Light spot advancing direction judging device and method,...

2006-06-20

2006-06-20

Psitos, A M (Department: 2653)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S044280

Reexamination Certificate

active

07065023

ABSTRACT:
A device and a method for judging the radial moving direction of light spots formed on the signal recording surface of an optical disc having grooves of two types, which are different from each other in terms of depth and which are arranged along a recording track that is a land of the optical disc. The judging section of the device judges the moving direction of the main spot on the basis of binarized data of a difference signal of the main spot and binarized data of a difference signal of one of spots on the side. With this arrangement, the moving direction of the light spots relative to a radial direction of the optical disc can be determined only by using difference signals without using any sum signal.

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