Holtz, Holtz, Goodman & Chick PC
Quarter-wave plate, and optical pickup device
A quarter-wave plate includes a base member including a ridge and trough periodic structure with a structural period of λmin/2<P<λmin arranged on one side of the base member, where λmin is 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 λmin and 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.
Konica Minolta Holdings, Inc.
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G02B G02B G11B G11B G11B
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Makiko Osamu
Saito Masuda