Optical head device having a plurality of optical elements...

Details Optical head device having a plurality of optical elements... Optical head device having a plurality of optical elements...

2005-11-01

2005-11-01

Patel, Gautam R. (Department: 2655)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112210, C369S112280, C369S112290

Reexamination Certificate

active

06961298

ABSTRACT:
In an optical head device for recording/reproducing information on/from an optical recording medium, at least one laser light source emits a laser light beam provided with a first polarized light component and a second polarized light component which are perpendicular to each other. A plurality of optical elements transmit a return light beam reflected by the optical recording medium passes to the light receiving element. A transmission efficiency for the first polarized light component and a transmission efficiency for the second polarized light component in each optical element is made different. A total transmission efficiency for the first polarized light component and a total transmission efficiency for the second polarized light component, which are defined by the respective transmission efficiencies of all the optical elements, are made substantially identical.

REFERENCES:
patent: 6238063 (2001-05-01), Tanitsu et al.
patent: 6272098 (2001-08-01), Takahashi et al.
patent: 6426837 (2002-07-01), Clark et al.
patent: 6462873 (2002-10-01), Kwok et al.
patent: 6563977 (2003-05-01), Chen et al.
patent: 6597430 (2003-07-01), Nishi et al.
patent: 6717906 (2004-04-01), Shimano

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