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:
Nov. 02, 2004
Filed:
May. 29, 2002
Mitsuhiro Togashi, Yokohama, JP;
Naoki Kaiho, Yokohama, JP;
Noriyoshi Takeya, Yokohama, JP;
Ichiro Morishita, Yokohama, JP;
Samsung Electro-Mechanics Co., Ltd., Kyunggi-Do, KR;
Abstract
Disclosed herein is an optical pickup device and method of adjusting the same. The optical pickup device and method of adjusting the same of the present invention can correct aberrations due to variation of thickness of an optical disc and dispersion of the emission wavelength by a semiconductor laser, which are generated in manufacturing processes of the optical disc and the optical pickup device, correct aberrations generated in recording/reproducing of the optical disc, due to variation of the emission wavelength and secular changes in the environment of the semiconductor laser, simplify and miniaturize the construction of the optical pickup device, and easily reduce manufacturing cost thereof. The optical pickup device of the present invention has a semiconductor laser ( ) and a photo diode ( ) for narrowing light emitted from the semiconductor laser ( ) to a predetermined diameter and for detecting light reflected and returned from an optical disc ( ). Further, the optical pickup device has a relay lens ( ) and a liquid crystal aberration correcting device ( ) disposed between the semiconductor laser ( ) and an object lens ( ) for correcting wavefront aberrations and/or remaining wavefront aberrations.