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. 11, 2006
Filed:
May. 18, 2004
Kun Yul Kim, Seoul, KR;
Kun Yul Kim, Seoul, KR;
Daewoo Electronics Corporation, Seoul, KR;
Abstract
A tilt servo apparatus for use in a ROM system includes means for generating a reconstructing beam to be projected onto a digital storage medium to generate a reflected beam; a holographic plate for storing a first and a second hologram and diffracting the reflected beam with the first and the second hologram to generate a first and a second holographic diffracted beam, respectively; a first and a second detector for generating a first and a second detected signal by detecting the first and the second holographic diffracted beam, respectively; means for generating a tilt servo signal based on the first and the second detected signal; and means for compensating a tilt error of the digital storage medium by using the tilt servo signal.