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:
Sep. 01, 1998
Filed:
Dec. 11, 1996
Yong-Jae Lee, Uiwang, KR;
Samsung Electronics Co., Ltd., Kyungki-Do, KR;
Abstract
An optical pickup apparatus compatible with disks having different thicknesses is provided. The optical pickup apparatus includes an optical source, a beam splitter for changing the direction of the incident beam, an objective lens which is located between the optical source and the disk for focusing the incident beam to form an optical spot on the disk, and a photodetector for detecting information and error signals by receiving the beam which is reflected from the disk and passed through the beam splitter. A hologram optical element (HOE) is provided between the beam splitter and the photodetector for diffracting the beam reflected from the disk into a zero-order beam and a positive first-order beam. The photodetector includes a first photodetector and a second photodetector which receive the zero-order beam and the positive first-order beam, respectively.