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:
Aug. 21, 2007
Filed:
Aug. 13, 2004
Hyo-kune Hwang, Gyeonggi-Do, KR;
Byung-ju Dan, Gyeonggi-Do, KR;
Jong-man Kim, Seoul, KR;
Nam-woong Kim, Seoul, KR;
Hyo-Kune Hwang, Gyeonggi-Do, KR;
Byung-Ju Dan, Gyeonggi-Do, KR;
Jong-Man Kim, Seoul, KR;
Nam-Woong Kim, Seoul, KR;
LG Electronics Inc., Seoul, KR;
Abstract
The present invention discloses an optical disk formed according to double injection molding of forming an area of the optical disk on which a recording film is formed, namely, an outer circumferential area by using polycarbonate that is an amorphous polymer, and forming an area of the optical disk on which the recording film is not formed, namely, an inner circumferential area by using a semi-crystalline polymer having a similar elastic modulus to that of polycarbonate and having durability to a static fatigue, especially polyamide. Therefore, the optical disk is efficiently prevented from being damaged by restricting growth of cracks near its hole, obtaining excellent optical characteristics as an information recording medium.