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:
Apr. 27, 2010
Filed:
May. 24, 2005
Kiyono Ikenaka, Hino, JP;
Kiyono Ikenaka, Hino, JP;
Konica Minolta Opto, Inc., Tokyo, JP;
Abstract
An objective lens is provided for an optical pickup apparatus at least reproducing information for a first optical disc, and recording and/or reproducing information for second and a third optical discs. The objective lens includes an optical surface including a common area including a diffractive structure having a cross section in a serrated shape and divided into a plurality of ring-shaped zones. Refractive index differences between media arranged at both side of the optical surface for a light flux with one and the other wavelength satisfy a predetermined condition, and the objective lens satisfies a predetermined conditions defined by using an approximate coefficient which makes a Pearson's correlation coefficient R satisfy 0.99998≦R when a depth parallel to the optical axis of step differences between the ring-shaped zones at a vertical distance from the optical axis is approximated by a least squares method.