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:
Dec. 22, 2009
Filed:
Jun. 29, 2005
Noriaki Nishi, Kanagawa, JP;
Kenji Yamamoto, Kanagawa, JP;
Takashi Kobayashi, Kanagawa, JP;
Katsuhiro Shindo, Miyagi, JP;
Yuhei Kobayashi, Kanagawa, JP;
Noriaki Nishi, Kanagawa, JP;
Kenji Yamamoto, Kanagawa, JP;
Takashi Kobayashi, Kanagawa, JP;
Katsuhiro Shindo, Miyagi, JP;
Yuhei Kobayashi, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
An optical system and pick-up device having an optical magnification suitable for three different optical disc formats and a light emitting means for emitting a laser beam having a wavelength corresponding to each disc in the optical system of the optical pickup for recording and/or reproducing an information signal to the optical discs. The optical pickup device has a first light emitting unit for emitting a laser beam having a first wavelength or a second wavelength, a second light emitting unit for emitting a laser beam having a third wavelength, a first collimator lens for transmitting the laser beams having the first or second wavelengths, a second collimator lens for transmitting the laser beam having the third wavelength, a first objective lens for transmitting the laser beams having the first or third wavelengths, and a second objective lens for transmitting the laser beam having the second wavelength.