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. 01, 2005
Filed:
Jun. 28, 2002
Byung-ki Cheong, Seoul, KR;
Soon-gwang Kim, Gyeonggi-Do, KR;
Won-mok Kim, Seoul, KR;
Moonkyo Chung, Seoul, KR;
Taek-sung Lee, Seoul, KR;
Sung-jin Park, Seoul, KR;
Sung-hun Lee, Daegu, KR;
Sung-hun Cho, Jeollanam-Do, KR;
Byung-ki Cheong, Seoul, KR;
Soon-Gwang Kim, Gyeonggi-Do, KR;
Won-Mok Kim, Seoul, KR;
Moonkyo Chung, Seoul, KR;
Taek-Sung Lee, Seoul, KR;
Sung-Jin Park, Seoul, KR;
Sung-Hun Lee, Daegu, KR;
Sung-Hun Cho, Jeollanam-Do, KR;
Korea Institute of Science and Technology, Seoul, KR;
Abstract
The present invention provides an optical recording medium in which the spot size of incident laser beam, focused on the medium by a far-field optic system characterized by λ and NA, is further reduced and maintained below the diffraction-limited size by means of material characteristics of the medium while reproducing from and recording on the information layer of the recording medium, thus making it possible to record and reproduce a high density of information exceeding the resolution limit of the optic system. A high density optical recording medium according to the present invention adopts a combination of two different super-resolution layers of mutually complementary optical characteristics with increasing light power. The combination of two super-resolution layers is made in either of two different types: for one type, each of the two super-resolution layers, having a respective threshold light intensity (or temperature) for the onset of change in optical transmittance, produces an increasing spot size of the transmitted beam with increasing light power once a respective threshold light intensity (or temperature) is exceeded, and for the other type, one layer produces an increasing spot size of the transmitted beam with increasing light power whereas the other layer exhibits a reverse trend.