Optical pickup apparatus

Details Optical pickup apparatus Optical pickup apparatus

2010-03-26

2011-12-20

Young, Wayne (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112010, C369S112160

Reexamination Certificate

active

08081557

ABSTRACT:
An optical pickup apparatus comprising: a laser light source; an objective lens; a reflection mirror; a photodetector; and a beam splitter, the beam splitter including a first reflective film configured to generate a first phase difference corresponding to a predetermined wavelength with respect to laser light, the reflection mirror including a second reflective film configured to generate a second phase difference corresponding to the predetermined wavelength with respect to the laser light, the first reflective film and the second reflective film being formed so that a combined phase difference of the first phase difference and the second phase difference becomes substantially quarter-wave with respect to the laser light.

REFERENCES:
patent: 4965780 (1990-10-01), Lee et al.
patent: 5307335 (1994-04-01), Komiya
patent: 5657305 (1997-08-01), Sasaki et al.
patent: 2006/0098552 (2006-05-01), Kawamura et al.
patent: 2008-251112 (2008-10-01), None

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