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:
Nov. 30, 2004
Bong-gi Kim, Suwon-si, KR;
Soo-han Park, Yongin-si, KR;
Jung-gug Pae, Suwon-si, KR;
Tae-youn Heor, Suwon-si, KR;
Bong-Gi Kim, Suwon-si, KR;
Soo-Han Park, Yongin-si, KR;
Jung-Gug Pae, Suwon-si, KR;
Tae-Youn Heor, Suwon-si, KR;
Samsung Electronics Co., Ltd., Suwon-si, KR;
Abstract
Disclosed is an optical pickup including a polarization holographic optical element (HOE) and a photodetector. The optical pickup includes a light source, an optical path changer, an objective lens, a polarization HOE, and a photodetector. The polarization HOE has a pattern designed to generate different astigmatisms in the left and right halves of the polarization HOE in a tangential direction and to divide plus and minus first-order beams in a radial direction. The photodetector includes a first light-receiving portion receiving a zero-order beam and second and third light-receiving portion that are disposed on either side of the first light-receiving portion in the tangential direction and respectively receive the plus and minus first-order beams.