Optical pick-up apparatus

Details Optical pick-up apparatus Optical pick-up apparatus

2005-04-22

2008-03-18

Amari, Alessandro (Department: 2872)

Optical: systems and elements

Diffraction

From grating

C369S112070, C369S112180

Reexamination Certificate

active

07345820

ABSTRACT:
A compatible optical pick-up apparatus, which records to and/or reproduce from both digital versatile disc (DVD)-type optical disks and compact disc (CD)-type optical disks for improving a signal regeneration capacity and a tracking capacity in operation at a high temperature. A polarized hologram of the optical pick-up apparatus is divided into six diffraction regions. The rays of a first light diffracted at the first and second diffraction regions are separately received by divided parts of a first bisected light-receiving portion of a photodetector.

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