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PATENT ABSTRACTS OF JAPAN 

(1 OPublication number : 10-050032 
(43)Date of publication of application : 20.02.1998 



(51)Int.CI. 



G11B 27/00 
G11B 7/00 
61 IB 20/12 
61 IB 20/18 
G11B 20/18 
G11B 20/18 



(21) Application number : 08-214075 (71)Applicant : SONY CORP 

(22) Date of filing : 26.07.1 996 (72)Inventor : FUNABASHI TAKESHI 



KIMURA MAKOTO 



(54) DRAW TYPE DISK SYSTEM, DRAW TYPE DISK RECORDING OR REPRODUCING 
METHOD AND DRAW TYPE DISK DRIVE DEVICE 

(57)Abstracfc 

PROBLEM TO BE SOLVED: To obtain a suitable 
recording or reproducing method by writing or reading 
management information about a DRAW type recording 
area of a DRAW type disk on a rewritable recording 
means. 

SOLUTION: A laser is continuously outputted at a 
reproducing level from a laser diode 31a by a laser diode 
driver 29a. A laser output level is controlled by an 
automatic laser power control(ALPC) circuit 39a. Laser 
light outputted from the laser diode 31a is projected 
from an objective lens 33a via an optical system to a 
recording surface of the disk 2, while its reflecting light 
is guided to a detector 32a by the optical system. This 
detector 32a composed of plural photodetectors is 
operated to output currents as photoelectrically 
converted signals from the individual photodetectors 
respectively, and these outputs are sent to an I- 
V/matrix amplifier 36a. 




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