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. 04, 1999
Filed:
Nov. 13, 1995
Yang-Oh Choi, Seoul, KR;
Daewoo Electronics, Co., Ltd., Seoul, KR;
Abstract
An optical pickup system for regenerating information stored on an optical disk including a pair of recording surfaces thereon, is provided with a pair of light sources, a detector, an objective lens, a signal detection unit, and a beam splitter having a first and a second recording surface. In this system, when the first light source is used for reproducing an information signal on the first recording surface of the optical disk, the first light beam transmitted through the second surface of the beam splitter is used for detecting the focusing error signal of the first recording surface of the optical disk. When the second light source is used for detecting the focusing error signal of the second recording surface of the optical disk, the second light beam reflected from the second surface of the beam splitter is utilized for reproducing an information signal on the second recording surface with the first light source turned off.