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PATENT ABSTRACTS OF JAPAN 

(1 1 publication number : 09-145634 
(43)Date of publication of application : 06.06.1 997 



(SDlntCI. G01N 21/88 

G11B 7/24 
G11B 20/12 
G11B 20/18 
G11B 20/18 



(21) Application number : 07-303074 (71)Applicant : SONY CORP 

(22) Date of filing : 21 .1 1 .1 995 (72)Inventor : FUJII NOBORU 



(54) METHOD AND DEVICE FOR DEFECT DETECTION AND OPTICAL INFORMATION 
RECORDING MEDIUM 

(57)Abstract: 

PROBLEM TO BE SOLVED: To enable defect detection 
in which error correction capability is considered, by 
superposing a data pattern, to which an error correcting 
code is added, to the laser beam of reproduction power 
for recording, and performing error correcting process 
for the data pattern, to which the error correcting code 
is added from the reflection photodetecting signal. 
SOLUTION: For a data pattern outputted from a record 
reproduction pattern generation circuit 1 , signal process 
such as addition of error correcting code, etc., is 
performed in sector unit with an encoder 2, and based 
on the signal, the signal driving an optical head 10 in real 
sector unit is formed. The top of a direct-read-after- 
write optical disk 12 is irradiated with the reproduction 
laser beam on which the defect detecting signal is 
superposed. The reproduction laser beam reflected from 
a disk 7 is detected with a head 109 photodetecting 
element, and the photodetecting signal is sent to a 
photodetecting system circuit 5. The circuit 5 extracts 

the defect detecting signal from the photodetecting signal, and the extracted defect detecting 
signal is sent to a decoder 6. The decoder 6 performs error correcting process for the defect 
detecting signal in sector unit. 



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