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:
Jul. 13, 2010
Filed:
Jul. 19, 2005
Yasuyuki Sugi, Ibaraki, JP;
Yoshiaki Minakawa, Ibaraki, JP;
Mitsuhiro Miyauchi, Ibaraki, JP;
Koichiro Wakabayashi, Ibaraki, JP;
Yasuyuki Sugi, Ibaraki, JP;
Yoshiaki Minakawa, Ibaraki, JP;
Mitsuhiro Miyauchi, Ibaraki, JP;
Koichiro Wakabayashi, Ibaraki, JP;
Hitachi Maxell, Ltd., Ibaraki-Shi, JP;
Abstract
An optical pickup system for reading information of three kinds of optical recording media. The optical pickup system has a wavelength selective filter that includes an outer area for shielding one light beam of light beams having three kinds of wavelengths and an inner area for allowing all the light beams to pass through. The optical pickup system also has an objective lens that focuses each light beam having passed through the wavelength selective filter on each light recording medium. An optical head and an optical disk apparatus have the optical pickup system.