Optical pickup apparatus and optical disc apparatus...

Details Optical pickup apparatus and optical disc apparatus... Optical pickup apparatus and optical disc apparatus...

2011-08-16

2011-08-16

Edun, Muhammad N (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044120, C369S044410, C369S112030, C369S112050

Reexamination Certificate

active

08000188

ABSTRACT:
An optical pickup apparatus comprising at least: a diffraction grating configured to split first wavelength light into at least a first main beam and first sub-beam, and to split second wavelength light into at least a second main beam and second sub-beam, the diffraction grating including a diffraction surface portion corresponding to the second wavelength light; and a photodetector including a first main light-receiving unit configured to be applied with the first main beam, a first sub-light-receiving unit configured to be applied with the first sub-beam, a second main light-receiving unit configured to be applied with the second main beam, and a second sub-light-receiving unit configured to be applied with the second sub-beam, a distance between the first main light-receiving unit and first sub-light-receiving unit being changed relative to a standardized distance between the first main light-receiving unit and first sub-light-receiving unit.

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ISA/US, Int'l Search Report/Written Opinion in PCT/JP2008/064668 in the name of Sanyo Electric Co., Ltd., dated Aug. 26, 2008. F1080515W000, PCT/ISA/220, W02009/022747.

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