Wave plate and optical pickup unit using the same

Details Wave plate and optical pickup unit using the same Wave plate and optical pickup unit using the same

2007-05-29

2007-05-29

Hindi, Nabil (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S110040

Reexamination Certificate

active

10828055

ABSTRACT:
As a ½ wave plate constituted by laminating two wave plates, a wave plate where temperature dependence of a phase difference is reduced is provided. In a wave plate constituted by laminating a first wave plate having a phase difference τ1(deg.) and an optical axis azimuth θ1(deg.), and a second wave plate having a phase difference τ2(deg.) and an optical axis azimuth θ2(deg.), the phase difference τ1(deg.) of the first wave plate and the phase difference τ2(deg.) of the second wave plate are set to 360n+180 (n=0, 1, 2 . . . ), and an angle formed by polarization planes of incident light and emitted light is θ (deg.). In this case, the first wave plate and the second wave plate are laminated so as to satisfy θ1=(90+θ/2)/2 and θ2=θ1+90+θ/2.

REFERENCES:
patent: 6504811 (2003-01-01), Morimoto

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