Optical disk unit

Details Optical disk unit Optical disk unit

2004-12-22

2009-08-04

Young, Wayne R (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S112170, C369S116000

Reexamination Certificate

active

07570562

ABSTRACT:
In an optical disk apparatus, transmittance and reflectance of a polarization beam splitter13to the S polarization and the P polarization of laser beams are adjusted so that a first polarization component level ratio in the laser beam received by a light receiver for reproducing signal17from a laser diode11via the polarization beam splitter13, and a second polarization component level ratio in the laser beam received by a light receiver for monitoring light source18from the laser diode11via the polarization beam splitter13become equal or the difference between the first and the second polarization component level ratios becomes within a predetermined permissible range.

REFERENCES:
patent: 5363363 (1994-11-01), Gage
patent: 5555538 (1996-09-01), Yanagawa et al.
patent: 6958805 (2005-10-01), Kim
patent: 60-93649 (1985-05-01), None
patent: 63-100647 (1988-05-01), None
patent: 5-128535 (1993-05-01), None
patent: 6-267102 (1994-09-01), None
patent: 7-249233 (1995-09-01), None
patent: 95/00873 (1995-01-01), None

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