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:
Nov. 03, 2009
Filed:
Jun. 16, 2005
Mika Wachi, Hino, JP;
Mika Wachi, Hino, JP;
Konica Minolta Opto, Inc., Tokyo, JP;
Abstract
A converging optical element for use in an optical pickup apparatus reproducing and/or recording information on a first optical disc using a first light flux with a wavelength λemitted by a first light source, reproducing and/or recording information on a second optical disc using a second light flux with a wavelength λemitted by a second light source, and reproducing and/or recording information on a third optical disc using a third light flux with a wavelength λemitted by a third light source, the converting optical element includes: a phase structure arranged on at least one surface of the converging optical element, wherein when fis a focal length of the converging optical element for the third light flux, the focal length fsatisfies a predefined condition.