Optical disc drive including detection and correction of...

Details Optical disc drive including detection and correction of... Optical disc drive including detection and correction of...

2008-03-25

2008-03-25

Psitos, A M (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044410

Reexamination Certificate

active

10679171

ABSTRACT:
The optical disc drive reads and/or writes data from/on an optical disc having an information storage layer. In an optical disc drive100, light from a light source3is focused by a focusing section1, and each of the peripheral and non-peripheral part of light reflected by the information storage layer is received by a photodetector4. Then, for each part of light, the drive100generates a focus signal and a light quantity signal, and normalizes the focus signal based on the light quantity signal. As a result, it is possible to generate a spherical aberration signal according to a quantity of spherical aberration produced at the focusing position of the light. Hence, the signal is not affected by defocusing and thus it is possible to precisely detect a spherical aberration caused by an uneven thickness of the disc and to detect a spherical aberration with high accuracy.

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