Optical pickup

Details Optical pickup Optical pickup

2006-11-21

2006-11-21

Wellington, Andrea (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112150, C369S112170

Reexamination Certificate

active

07139234

ABSTRACT:
An optical pickup is provided for recording and reproduction of information onto and from an optical disk. In the optical disk, in a forward optical path, a single polarized optical beam is converted to plural polarized optical beams. Polarization modes of the plural polarized optical beams are then converted to a polarization mode suitable for one of the recording and the reproduction to produce polarization-converted optical beams and to radiate the polarization-converted optical beams to the disk. In the backward optical path, polarization modes of the polarization-converted optical beams reflected from the disk are returned to the same polarization mode as that of the plural polarized optical beams, so that plural polarized reflected optical beams are produced. Polarization modes of the plural polarized reflected optical beams are then returned to the same polarization mode as the single polarized optical mode.

REFERENCES:
patent: 5793735 (1998-08-01), Oono
patent: 5892749 (1999-04-01), Yamanaka
patent: 5905708 (1999-05-01), Richter
patent: 5917798 (1999-06-01), Horimai et al.
patent: 2002-150598 (2002-05-01), None

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