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PATENT ABSTRACTS OF JAPAN 

(1 1 publication number : 09-270175 
(43)Date of publication of application : 14.10.1997 



(51)Int.CI. 



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(21 Application number : 08-078044 
(22)Date of filing : 29.03.1 996 



(71 Applicant : RICOH CO LTD 
(72)Inventor : KIGUCHI HIROYUKI 



(54) DIRECT READ AFTER WRITE TYPE OPTICAL DISK DEVICE 

(57)Abstract: 

PROBLEM TO BE SOLVED: To enhance the reliability of data 
and to make the load of a host computer small even though a 
defect or the like are present on a disk by provid ing a 
warning to the host computer when a prescribed defect is 
detected in reproducing data. 

SOLUTION: The figure 1 shows the constitution of the whole 
of a driving device. Data are transferred from a hot computer 
PC2 to a driving device via an I/F controller 3. Then, the data 
are temporarily stored in a buffer RAM 5 are read out by a 
data control part 4 and are converted into a CD format in a 
data processing part 7 to be transmitted to an LD control 
part 10 to control the light emitting quantity of the LD and 
then a laser light beam is irradiated on a disk. Servo signal is 
detected from the reflected light beam from the disk in a 
reproducing part 9 and is inputted to a mechanical control 
part 8 to control the movable part of an optical part 14. At 
this time, when the defect of a reproduced signal is detected 
by a defect detecting part 6, an error is warned to the host 
computer PC2. 




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