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1. (US6338888) Optical recording medium and method of information recording/reproduction using the same

Office : United States of America
Application Number: 09423244 Application Date: 05.11.1999
Publication Number: 6338888 Publication Date: 15.01.2002
Grant Number: 6338888 Grant Date: 15.01.2002
Publication Kind : B1
Prior PCT appl.: Application Number:JP98002021 ; Publication Number: Click to see the data
IPC:
B32B 3/02
G11B 7/00
G11B 7/0045
G11B 7/005
G11B 7/24
G11B 7/244
G11B 7/247
G11B 7/248
B PERFORMING OPERATIONS; TRANSPORTING
32
LAYERED PRODUCTS
B
LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
3
Layered products essentially comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products essentially having particular features of form
02
characterised by features of form at particular places, e.g. in edge regions
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
[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
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
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 Industrial Co., Ltd.
Inventors: Takase, Yoshiyuki
Tosaki, Yoshihiro
Takahashi, Katsuyuki
Agents: Wenderoth, Lind & Ponack, L.L.P.
Priority Data: 09117825 08.05.1997 JP
Title: (EN) Optical recording medium and method of information recording/reproduction using the same
Abstract: front page image
(EN)

The optical recording medium includes at least a recording layer, a recording supplemental layer, a reflection layer and a protection layer on a light permeable substrate, 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 λ1and also recording and/or reproducing is possible using a laser beam having a wavelength of λ2which is shorter than λ1,a spectral absorbance of the recording layer is in the range between 5% and 35% at a wavelength of λ1and not less than 15% at a wavelength of λ2,and the recording supplemental layer has a peak of spectral reflectance at a wavelength in the vicinity of λ2.


Also published as:
KR1020010012368EP0982719CN1255227WO/1998/050915