Optical pickup device and optical element

Details Optical pickup device and optical element Optical pickup device and optical element

2008-05-06

2008-05-06

Korzuch, William (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112130

Reexamination Certificate

active

07369480

ABSTRACT:
An optical pickup device includes a light source emitting a light beam having a wavelength within a range of 390 nm to 420 nm and an optical element to perform recording and/or reproducing of information of an optical disk having a protective substrate thickness d1mm using the first light beam from the first light source, wherein the optical element is made of a mixed material produced by dispersing particles into a resin, a sign of a refractive index change Δn2/Δt of the particles owing to a temperature change is opposite to a sign of a refractive index change Δn1/Δt of the resin owing to a temperature change, or an absolute value of the refractive index change Δn2/Δt is smaller than an absolute value of the refractive index change Δn1/Δt.

REFERENCES:
patent: 5223978 (1993-06-01), Burkhart et al.
patent: 5225928 (1993-07-01), Dugan
patent: 6434104 (2002-08-01), Asoma
patent: 6594222 (2003-07-01), Maruyama
patent: 6728172 (2004-04-01), Ikenaka et al.

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