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Full text of "USPTO Patents Application 10670332"

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Published S( ;> ri;-il No 


TW37I752 


Title 


Optical disc having variable spare area rates and method for variably 
setting the rate of spare areas in the optical disc 


Patent type: 


B 


Date of Grant 


1999/10/11 


Application Number 


87106759 


Filing Date 


1998/5/1 


IPC 


G11B20/12 


Inventor 


YEO, WOON-SEONG(KR) 


Priority 


Country 


Application Number 


Priority Date 


KR 


19970019695 


5/21/1997 


Applicant 


Name 


Country 


Individual/ Company 


LG ELECTRONICS INC. 


KR 


Company 


A 1 \ e- t r-'y.- > t ■ ■ 


In a method for setting variable areas of an optical disc which 
variably sets spare area rates of a prescribed quantity provided for 
preparing liable -occurring recording error due to a defect of the 
optical disc an in the optical disc having the variable spare areas, the 
total quantity of the spare areas installed to the optical disc may be 
the same as the prescribed quantity. Also the size rates of the spare 
areas are variably set in the radius direction by centering about a 
center portion of the optical disc. Particularly, the more spare area 
rates are given to the inner circumferential portion and outer 
circumferential portion, and the less spare are rates are given to the 
center portion which is relatively stable portion, thereby minimizing 
the effect occurring rate to decrease the number of defective cliscs, 



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