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:
Apr. 13, 1999
Filed:
Sep. 24, 1997
Jin-hwan Kim, Kyonggi-do, KR;
Hyun-kuk Shin, Kyonggi-do, KR;
Samsung Electronics Co., Ltd., Kyungki-do, KR;
Abstract
A hologram optical pick-up device using a first and second laser sources emit laser beams having different wavelengths, which are then focused by an objective lens on a disc, and reflected at a surface of the disc. The reflected laser beams are diffracted by a first hologram or a second hologram, and then received by a first photo detector or a second photo detector. Accordingly, a laser beam having an adjustable wavelength according to a thickness and a recording surface of the disc is emitted by the first laser source or the second laser source in order compensate the aberration of the laser beam due to the thickness of the disc. Thereby, the same hologram optical pick-up device can reproduce data from discs having different recording surfaces without loss of data. Also, the hologram optical pick-up can record and reproduce data on/from any disc with an increased efficiency of the laser beam.