The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 06, 2008
Filed:
Apr. 19, 2005
Kiyono Ikenaka, Hachioji, JP;
Mika Wachi, Hachioji, JP;
Kiyono Ikenaka, Hachioji, JP;
Mika Wachi, Hachioji, JP;
Konica Minolta Opto, Inc., Tokyo, JP;
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 dmm 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 Δn/Δt of the particles owing to a temperature change is opposite to a sign of a refractive index change Δn/Δt of the resin owing to a temperature change, or an absolute value of the refractive index change Δn/Δt is smaller than an absolute value of the refractive index change Δn/Δt.