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. 03, 1996
Filed:
Aug. 28, 1995
Keun Y Yang, Seoul, KR;
Goldstar Co., Ltd., Seoul, KR;
Abstract
This invention relates to an optical pickup system which can detect focus errors and tracking errors without using diffraction grating. The optical pickup system comprises a laser diode for emitting laser beams, an objective lens for focusing the laser beam from the laser diode onto an optical disc, a two division hologram positioned between the laser diode and the objective lens for diffracting beams after separating a reflected beam reflected at the optical disc and passed through the objective lens into a first laser beam and a second laser beam along an tangential line to a track of the optical disc, and a four division photodetector for focusing the two laser beams diffracted by the two division hologram.