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:
Mar. 09, 2010
Filed:
Apr. 25, 2005
Kenji Yamamoto, Kanagawa, JP;
Katsutoshi Sato, Tokyo, JP;
Noriaki Nishi, Kanagawa, JP;
Midori Kanaya, Tokyo, JP;
Shinya Makita, Kanagawa, JP;
Kenji Yamamoto, Kanagawa, JP;
Katsutoshi Sato, Tokyo, JP;
Noriaki Nishi, Kanagawa, JP;
Midori Kanaya, Tokyo, JP;
Shinya Makita, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
An optical pickup including a light source unit having a first radiating unit for radiating a light beam of a first wavelength, a second radiating unit for radiating a light beam of a second wavelength and a third radiating unit for radiating a light beam of a third wavelenght, a collimator lens having different focal lengths dependent on the first to third wavelengths, and an objective lens for condensing light beams, radiated from the first to third radiating units, on an information recording surface of an optical disc, and a recording and/or reproducing apparatus employing the optical pickup, are disclosed. The optical pickup and the recording and/or reproducing apparatus are used for recording and/or reproducing the information for plural sorts of the information recording medium of different formats. Certain components of the optical pickup are used in common for the different light beams to reduce the size of the device as well as to correct the spherical aberration.