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. 16, 1999
Filed:
Jul. 22, 1997
Yang-Oh Choi, Seoul, KR;
Daewoo Electronics Co., Ltd., Seoul, KR;
Abstract
An optical pickup system reads an information signal from stored on one of a first and a second optical disks alternatively to be loaded on a disk tray, wherein each of the optical disks may have a different thickness. The optical pickup system includes a light source for generating a first and a second light beams having a different wavelength from each other, a first wavelength .lambda..sub.1, and a second wavelength .lambda..sub.2, and an objective lens provided with a first and a second parts, wherein the surface of the first part is coated with a first dielectric film capable of transmitting only the first light beam emitted from the light source, whereas the surface of the second part is coated with a second dielectric film capable of transmitting only the second light beam, but totally reflecting the other light beams impinging thereon, thereby allowing the optical pickup system to detect an information signal from the respective optical disks.