Quarter-wave plate, and optical pickup device

Details Quarter-wave plate, and optical pickup device Quarter-wave plate, and optical pickup device

2011-08-16

2011-08-16

Young, Wayne R (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C359S506000

Reexamination Certificate

active

08000210

ABSTRACT:
A quarter-wave plate includes a base member including a ridge and trough periodic structure with a structural period of λmin/2<P<λminarranged on one side of the base member, where λminis the minimum wavelength among the wavelengths of a plurality of light fluxes which pass the quarter-wave plate. In the quarter-wave plate, refractive index of a ridge portion of the ridge and trough periodic structure for the wavelength λminand a light transmittance have predetermined values. The ridge and trough periodic structure satisfies the predetermined condition relating to the structural height and the structural width of the ridge portion.

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English Language International Search Report dated Aug. 28, 2007 issued in parent Appln. No. PCT/JP2007/061273.

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