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2003 ^3 M 27 H (27.03.2003) 




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= (54) Title: OPTICAL RECORDING MEDIUM 

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Mbps or above can be ensured. 



(57) Abstract: A high-speed write-once optical 
recording medium employing a laser beam blue 
or one with a shorter wavelength, and an optical 
recording method and an optical recorder for 
recording thereon. The high-speed write-once 
optical recording medium (10) comprises a recording 
layer (18) and an light transmitting layer (22) formed 
sequentially on a supporting substrate (12), wherein 
the recording layer (18) comprises first and second 
subrecording layers (18A, 18B) laid in layer and 
principally containing Al and Sb, respectively. When 
the recording layer (18) is irradiated with a blue laser 
beam from a laser light source (24) through the light 
transmitting layer (22), Al and Sb contained in the 
first and second subrecording layers (18A, 18B) are 
diffused and mixed thus forming a recording mark 
having a reflectivity varied irreversibly through the 
mixing. Thickness of the recording layer (18) is set 
such that recording at a record transfer rate of 35 



WO 03/025924 Al 



(57) 

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20 

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Fig. 3 




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PCT/JP02/09300 




INTERNATIONAL SEARCH REPORT 



InternlBnai application No. 

PCT/JP02/09300 



A. CLASSIFICATION OF SUBJECT MATTER 
Int. CI 7 G11B7/24, 7/0045 



According to International Patent Classification (IPC) or to both national classification and IPC 
B. FIELDS SEARCHED 

Minimum documentation searched (classification system followed by classification symbols) 
Int. CI 7 G11B7/24, 7/0045, 7/26 



Documentation searched other than minimum documentation to the extent that such documents are included in the fields searched 
Jitsuyo Shinan Koho 1922-1996 Toroku Jitsuyo Shinan Koho 1994-2002 

Kokai Jitsuyo Shinan Koho 1971-2002 Jitsuyo Shinan Toroku Koho 1996-2002 

Electronic data base consulted during the international search (name of data base and, where practicable, search terms used) 



C. DOCUMENTS CONSIDERED TO BE RELEVANT 



Category* 


Citation of document, with indication, where appropriate, of the relevant passages 


Relevant to claim No. 


Y 
A 


JP 2000-222764 A (Director General, Agency of 
Industrial Science and Technology, Minolta Co., 
Ltd.), 

11 August, 2000 (11.08.00), 
Par. Nos. [0015], [0023] 
(Family: none) 


1-3, 6-10 
4,5 

t 


Y 
A 


JP 2000-285509 A (Ricoh Co., Ltd.), 
13 October, 2000 (13.10.00), 
Full text; all drawings 
(Family: none) 


1-3, 6-10 
4,5 


Y 
A 


JP 6-171236 A (Ricoh Co., Ltd.), 
21 June, 1994 (21.06.94), 
Full text; all drawings 
(Family: none) 


1-3, 6-10 
4,5 



px~| Further documents are listed in the continuation of Box C. See patent family annex. 



"A" 

« L » 

XT 
«p» 



Special categories of cited documents: "T* 
document defining the general state of the art which is not 
considered to be of particular relevance 

earlier document but published on or after the international filing "X" 
date 

document which may throw doubts on priority claim(s) or which is 
cited to establish the publication date of another citation or other "Y" 
special reason (as specified) 

document referring to an oral disclosure, use, exhibition or other 
means 

document published prior to the international filing date but later 



later document published after the international filing date or 
priority date and not in conflict with the application but cited to 
understand the principle or theory underlying the invention 
document of particular relevance; the claimed invention cannot be 
considered novel or cannot be considered to involve an inventive 
step when the document is taken alone 

document of particular relevance; the claimed invention cannot be 
considered to involve an inventive step when the document is 
combined with one or more other such documents, such 
combination being obvious to a person skilled in the art 
document member of the same patent family 



Date of the actual completion of the international search 
21 October, 2002 (21.10.02) 


Date of mailing of the international search report 

05 November, 2002 (05.11.02) 


Name and mailing address of the ISA/ 

Japanese Patent Office 

Facsimile No. 


Authorized officer 
Telephone No. 



Form PCT/ISA/210 (second sheet) (July 1998) 



INTERNATIONAL SEARCH REPORT 



International application No. 

PCT/JP02/09300 



C (Continuation). DOCUMENTS CONSIDERED TO BE RELEVANT 



Category* 



Y 
A 



A 



Citation of document, with indication, where appropriate, of the relevant passages 



Microfilm of the specification and drawings annexed 
to the request of Japanese Utility Model Application 
No. 7929/1991 (Laid-open No. 89374/1992) 

(Toshiba Corp.), 

04 August, 1992 (04.08.92), 

Full text; all drawings 

(Family: none) 

JP 2000-187882 A (Sony Corp.), 
04 July, 2000 (04.07.00), 

Claims; Par. Nos. [0010], [0011], [0022], [0061] 
(Family: none) 

WO 99/44199 A (Sony Corp.), 
02 September, 1999 (02.09 99), 
Pages 22, 31, 32 
Sc EP 0984443 Al 

JP 10-329426 A (TDK Corp.), 
15 December, 1998 (15.12.98), 
Claims 

(Family: none) 

JP 6-131693 A (Hitachi, Ltd.), 
13 May, 1994 (13.05.94) , 
Abstract 
(Family: none) 

JP 2000-99988 A (Toyota Central Research And 
Development Laboratories, Inc.) 
07 April, 2000 (07.04.00), 
Abstract 
(Family: none) 

JP 11-34501 A (Kao Corp.), 
09 February, 1999 (09-02.99)-, 
Abstract 
(Family: none) 



Relevant to claim No. 



1-3, 6-10 
4,5 



1-3, 6-10 



1-3, 6-10 



1-10 



1-10 



1-10 



1-10 



Form PCT/ISA/210 (continuation of second sheet) (July 1998) 



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C. 



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Y 
A 



Y 
A 

Y 
A 



IP 2000-222764 A (Tmm®&k, 5 7 
#%h) 2000. 08. 11 [0015], [0023] 

JP 2000-285509 A (t^C^thU ) 
2000. 1 0. 13 ^@ (7r5y^U 

JP 6-171236 A (t*^%hy =»— ) 

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4,5 

1-3, 6-10 
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JP 2000-187882 A (y~~ $c£#*±) 
2000. 07. 04 #fpff ^CDfSffls [0010] , 
[0011], [0 0 2 2], [0 0 6 1] C7r$y— fcU 

WO 99/4 4199 A (y=— t*^%h) 
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JP 2000-99988 A (tfcSl^fcftffl "P^W^Bf) 
2000. 04. 07 ®ft (77 5y-4L) 

JP 11-34501 A (^3E^^|t) 
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