Optical element, optical head, optical information recording...

Details Optical element, optical head, optical information recording... Optical element, optical head, optical information recording...

2011-01-04

2011-01-04

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

C369S112110, C369S112120, C369S112130

Reexamination Certificate

active

07864650

ABSTRACT:
The present invention provides a first light source (21) that emits light of a first wavelength, that at least either records onto or reproduces information from an information recording medium (30), a light source (22) that emits light of a second wavelength that records onto or reproduces information from an information recording medium (33), a light source (23) that emits light of a third wavelength that records onto or reproduces information from an information recording medium (23), focusing means, an optical element (28) that passes light of the first wavelength and diffracts light of the second and third wavelengths, wherein the optical element (28) is an optical element in which grooves are formed in a substrate, wherein the expression:in-line-formulae description="In-line Formulae" end="lead"?380 nm≦(n−1)×d≦420 nmin-line-formulae description="In-line Formulae" end="tail"?is satisfied, where n is a refractive index of the substrate at a wavelength of 400 nm, and d (nm) is a depth per step of the grooves, and wherein the grooves are formed in two steps of depth d and depth2d.

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“Blue/DVD/CD Compatible Optical Head With Three Wavelengths and a Wavelength Selective Filter”, Ryuichi Katayama and Yuichi Komatsu, Function Devices Research Laboratories, NEC Corporation, We-C-05, p. 30-31.

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