Optical pickup having a polarization beam splitter

Details Optical pickup having a polarization beam splitter Optical pickup having a polarization beam splitter

2004-11-22

2008-11-11

Feild, Joseph (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S112210

Reexamination Certificate

active

07450477

ABSTRACT:
An optical pickup which can remove birefringence due to the non-uniformity of an optical recording medium by using a polarization beam splitter. The optical pickup includes a light source emitting a laser beam, a beam splitter reflecting part of incident light and straight transmitting the remaining light to change a proceeding path of the incident light, an objective lens focusing the incident light passed through the beam splitter to form a light spot on an optical recording medium, a polarization beam splitter arranged on an optical path between the beam splitter and the objective lens for transmitting light having one polarization and reflecting light having a different polarization. The optical pickup further includes a first photodetector for receiving the light having one polarization which is reflected from the optical recording medium and is transmitted by the polarization beam splitter and passes through the beam splitter, and a second photodetector for receiving the light having a different polarization reflected from the optical recording medium that is reflected by the polarization beam splitter. An information signal and error signals are then determined from a signal detected by the first and second photodetectors.

REFERENCES:
patent: 4841508 (1989-06-01), Kimura
patent: 4951274 (1990-08-01), Iwanaga et al.
patent: 5084850 (1992-01-01), Yanagawa et al.
patent: 5084851 (1992-01-01), Noda et al.
patent: 6567353 (2003-05-01), Kubo et al.
patent: 2002/0154582 (2002-10-01), Yonezawa et al.

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