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. 15, 2005
Filed:
Jul. 12, 2001
Tetsuo Ueyama, Nara, JP;
Keiji Sakai, Nara, JP;
Yukio Kurata, Tenri, JP;
Katsushige Masui, Nara, JP;
Naotaka Otsuka, Nara, JP;
Renzaburo Miki, Nara, JP;
Hiroshige Hirajima, Tenri, JP;
Noboru Fujita, Kitakatsuragi-gun, JP;
Tetsuo Ueyama, Nara, JP;
Keiji Sakai, Nara, JP;
Yukio Kurata, Tenri, JP;
Katsushige Masui, Nara, JP;
Naotaka Otsuka, Nara, JP;
Renzaburo Miki, Nara, JP;
Hiroshige Hirajima, Tenri, JP;
Noboru Fujita, Kitakatsuragi-gun, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
An optical pickup can be provided, the optical pickup being capable of recording and playback of a plurality of optical disks having different specs by using light beams of different wavelengths, and further being suitable for integrating the semiconductor lasers and light receiving elements into a single package, by including: first and second semiconductor lasers adjacently disposed; a three-beam diffraction grating for generating three beams for tracking control; a second hologram element for diffracting light of the second semiconductor laser to guide it to a photosensor; a complex polarization beam splitter (PBS) for reflecting only light from the first semiconductor laser; and a first hologram element for diffracting light of the first semiconductor laser to guide it to the photosensor.