G - Physics – 11 – B
Patent
G - Physics
11
B
G11B 7/24 (2006.01) G11B 7/0037 (2006.01) G11B 7/004 (2006.01) G11B 7/0045 (2006.01) G11B 7/005 (2006.01) G11B 7/007 (2006.01)
Patent
CA 2397132
An optical disc and methods for recording essential information in and reproducing essential information from an optical disc are provided. The optical disc includes as a pattern of crystalline and amorphous marks storing essential information. The essential information recording method involves: heating an amorphous recording layer above the temperature of crystallization by radiating a beam according to a photoelectrically converted signal; and slowly cooling the heated recording layer to the temperature of crystallization or below to form a pattern of crystalline and amorphous marks. The essential information reproducing method involves: radiating a beam onto a pattern of crystalline and amorphous marks in which essential information of the optical disc is recorded; receiving the beam reflected from the pattern of crystalline and amorphous marks and photoelectrically converting the received beam to detect a signal; filtering the detected signal through a high-pass filter; and reproducing the essential information of the optical disc from the filtered signal. Essential information can be recorded in a recordable optical disc by phase change using an existing disc initializing apparatus after deposition of a recording layer and before initialization of the optical disc. Therefore, an additional recording apparatus and process is not necessary, and no damage caused by a high energy of laser occurs in the optical disc.
Lee Kyung-Geun
Park In-Sik
Yoon Du-Seop
Ridout & Maybee Llp
Samsung Electronics Co. Ltd.
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