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. 05, 2002
Filed:
Dec. 23, 1998
Samsung Electro-Mechanics Co., Ltd., Suwon, KR;
Abstract
A first light source of an optical pickup emits a first laser beam having a first predetermined wavelength. A second light source emits a second laser beam that substantially perpendicularly crosses the first laser beam and has a second predetermined wavelength different from the first predetermined wavelength. A holographic beam splitter is slopingly disposed where the laser beams cross. The holographic beam splitter has a hologram diffractive surface on one surface and a coating layer on another surface for being penetrated by and reflecting the laser beams at a first predetermined ratio. A flat beam splitter is arranged on a first path of the laser beams from the holographic beam splitter to be penetrated by and reflect the laser beams at a second predetermined ratio. A collimator lens is arranged on a second path of the laser beams from the flat beam splitter to shape the laser beams. An objective lens focuses the shaped laser beams at least upon an optical disc. A photodiode reads out recorded and error information from the laser beams when reflected from the optical disc.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile