GRATING ELEMENT, OPTICAL PICKUP OPTICAL SYSTEM AND METHOD OF DESIGNING GRATING ELEMENT

A grating element is provided with diffraction members wherein protrusions and recesses are periodically arranged, respectively, on one surface of each of transparent substrates. The diffraction members are laminated in the substantially perpendicular direction to the transparent substrates, the pro...

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Bibliographic Details
Main Authors SHIBA TAKAKO, SHIMANO TAKESHI, MIYAUCHI MITSUHIRO
Format Patent
LanguageEnglish
Published 14.04.2011
Subjects
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
LAYERED PRODUCTS
LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PERFORMING OPERATIONS
PHYSICS
TRANSPORTING
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Summary:A grating element is provided with diffraction members wherein protrusions and recesses are periodically arranged, respectively, on one surface of each of transparent substrates. The diffraction members are laminated in the substantially perpendicular direction to the transparent substrates, the protrusions of the diffraction members are made of a dielectric multilayer film, and the dielectric multilayer film has dielectric films of two or more types laminated in the substantially perpendicular direction on the transparent substrates. The wavelengths of laser beams diffracted at predetermined diffraction efficiencies by the diffraction members are different from one another.
Bibliography:Application Number: US20090995761