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:
Jul. 21, 2009
Filed:
Sep. 30, 2004
Jong-man Kim, Seoul, KR;
Hyo-kune Hwang, Gyeonggi-Do, KR;
Byung-ju Dan, Gyeonggi-Do, KR;
Nam-woong Kim, Seoul, KR;
Jong-Man Kim, Seoul, KR;
Hyo-Kune Hwang, Gyeonggi-Do, KR;
Byung-Ju Dan, Gyeonggi-Do, KR;
Nam-Woong Kim, Seoul, KR;
LG Electronics Inc., Seoul, KR;
Abstract
An optical disc drive include a turntable for mounting an optical disc, a driving unit rotating the turntable, and an optical disc heating member for heating a center portion of the optical disc. In the optical disc drive, an inner circumference temperature of the optical disc is maintained to be higher than a peripheral temperature of the optical disc by at least 50° C. According to this, a growth of a crack generated at a periphery of a hole of the optical disc is restrained thereby to effectively prevent a damage of the optical disc.