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:
May. 06, 2008
Filed:
Jan. 04, 2005
Masaru Ogawa, Ikoma, JP;
Tetsuo Ueyama, Nara, JP;
Kohji Minami, Gose, JP;
Tomoyuki Miyake, Nara, JP;
Tomiyuki Numata, Tenri, JP;
Masaru Ogawa, Ikoma, JP;
Tetsuo Ueyama, Nara, JP;
Kohji Minami, Gose, JP;
Tomoyuki Miyake, Nara, JP;
Tomiyuki Numata, Tenri, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
The optical miniaturized module includes a semiconductor laser for irradiating an optical disk with laser light, a diffraction grating for forming a main beam and two sub beams from the laser light, a polarization hologram for dividing reflected light from the optical disk, and a photodetector for detecting the reflected light. The polarization hologram includes a first parting line defined in a direction optically corresponding to a radial direction as the optical disk rotates. A main beam M incident area is divided with a boundary defined by the first parting line. A sub beam A incident area and a sub beam B incident area are each arranged avoiding the first parting line.