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1. (EP0982719) OPTICAL RECORDING MEDIUM AND METHOD OF INFORMATION RECORDING/REPRODUCTION USING THE SAME

Office : European Patent Office
Application Number: 98919503 Application Date: 07.05.1998
Publication Number: 0982719 Publication Date: 01.03.2000
Publication Kind : B1
Designated States: DE, FR, GB
Prior PCT appl.: Application Number:JP1998002021 ; Publication Number: Click to see the data
IPC:
G11B 7/0045
G11B 7/005
G11B 7/24
G11B 7/244
G11B 7/2472
G11B 7/2475
G11B 7/248
G11B 7/253
[IPC code unknown for G11B 7/045][IPC code unknown for G11B 7/05]
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
7
Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation, reproducing using an optical beam at lower power; Record carriers therefor
24
Record carriers characterised by shape, structure or physical properties, or by the selection of the material 
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
7
Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation, reproducing using an optical beam at lower power; Record carriers therefor
24
Record carriers characterised by shape, structure or physical properties, or by the selection of the material 
241
Record carriers characterised by the selection of the material
242
of recording layers
244
comprising organic materials only
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
7
Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation, reproducing using an optical beam at lower power; Record carriers therefor
24
Record carriers characterised by shape, structure or physical properties, or by the selection of the material 
241
Record carriers characterised by the selection of the material
242
of recording layers
244
comprising organic materials only
246
containing dyes
247
methine or polymethine dyes
2472
cyanine
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
7
Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation, reproducing using an optical beam at lower power; Record carriers therefor
24
Record carriers characterised by shape, structure or physical properties, or by the selection of the material 
241
Record carriers characterised by the selection of the material
242
of recording layers
244
comprising organic materials only
246
containing dyes
247
methine or polymethine dyes
2475
merocyanine
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
7
Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation, reproducing using an optical beam at lower power; Record carriers therefor
24
Record carriers characterised by shape, structure or physical properties, or by the selection of the material 
241
Record carriers characterised by the selection of the material
242
of recording layers
244
comprising organic materials only
246
containing dyes
248
porphines; azaporphines, e.g. phthalocyanines
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
7
Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation, reproducing using an optical beam at lower power; Record carriers therefor
24
Record carriers characterised by shape, structure or physical properties, or by the selection of the material 
241
Record carriers characterised by the selection of the material
252
of layers other than recording layers
253
of substrates
CPC:
G11B 7/2475
G11B 7/0045
G11B 7/005
G11B 7/24
G11B 7/244
G11B 7/2472
G11B 7/248
G11B 7/253
Y10T 428/21
Applicants: MATSUSHITA ELECTRIC IND CO LTD
Inventors: TAKASE YOSHIYUKI
TOSAKI YOSHIHIRO
TAKAHASHI KATSUYUKI
Priority Data: 11782597 08.05.1997 JP
9802021 07.05.1998 JP
Title: (DE) OPTISCHES AUFZEICHNUNGSMEDIUM UND VERFAHREN ZUR INFORMATIONSAUFZEICHNUNG-/-WIEDERGABE DAFÜR
(EN) OPTICAL RECORDING MEDIUM AND METHOD OF INFORMATION RECORDING/REPRODUCTION USING THE SAME
(FR) SUPPORT D'ENREGISTREMENT OPTIQUE ET PROCEDE D'ENREGISTREMENT / REPRODUCTION D'INFORMATIONS L'UTILISANT
Abstract: front page image
(EN) The optical recording medium includes at least a recording layer (2), a recording supplemental layer (5), a reflection layer (3) and a protection layer (4) on a light permeable substrate (1), each of the recording layer and the recording supplemental layer is made mainly of an organic pigment material, with the optical recording medium, recording and reproducing is possible using a laser beam having a wavelength of lambda 1 and also recording and/or reproducing is possible using a laser beam having a wavelength of lambda 2 which is shorter than lambda 1, a spectral absorbance of the recording layer is in the range between 5 % and 35 % at a wavelength of lambda 1 and not less than 15 % at a wavelength of lambda 2, and the recording supplemental layer has a peak of spectral reflectance at a wavelength in the vicinity of lambda 2.
(FR) L'invention concerne un support d'enregistrement optique comprenant au moins une couche d'enregistrement (2), une couche auxiliaire d'enregistrement (5), une couche réfléchissante (3) et une couche protectrice (4) disposées sur un substrat transparent (1) dans cet ordre. La couche d'enregistrement et la couche d'enregistrement auxiliaire sont essentiellement constituées d'un colorant organique. On peut effectuer un enregistrement et/ou une reproduction au moyen d'un faisceau laser ayant une longueur d'onde $g(l)1 ou au moyen d'un faisceau laser ayant une longueur d'onde $g(l)2 plus courte que la longueur d'onde $g(l)1. La couche d'enregistrement présente une absorbance spectroscopique comprise entre 5 et 35 % pour la longueur d'onde $g(l)1 et de 15 % ou davantage pour la longueur d'onde $g(l)2. La couche d'enregistrement auxiliaire présente une crête de réflectance spectroscopique proche de la longueur d'onde $g(l)2.
Also published as:
KR1020010012368US6338888CN1255227WO/1998/050915