EP0237873A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Optical recording medium
Assignee: Canon Inc
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Filing: 1987-03-05
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Granted: —
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Expires: 2007-03-05
Abstract
Abstract In an optical recording medium which performs recording and reproduction by irradiating a laser beam onto a recording layer, the recording layer comprises at least a dye compound (A) having an absorption maximum near the wavelength of the recording laser beam and a reflective organic compound (B) which is a substance not having absorption necessary for recording relative to the recording laser beam but having high reflectance relative to the reproduction beam. Also, in an optical recording medium which performs recording and reproduction by irradiation of a laser beam onto a recording layer, the recording layer comprises a dye compound (A) and a reflective organic compound (B), said reflective organic compound having a reflectance of l0 % or higher relative to the light with absorption maximum wavelength of the dye compound (A), and said reflective organic compound (B) having a reflectance greater than that of the dye compound (A) relative to the light with said absorption maximum wavelength.
Inventors
- 👤 Oguchi Yoshihiro
- 👤 Takasu Yoshio
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 19:19
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/244; G11B7/252; G11B7/258; G11B7/246; G11B2007/24612; G11B7/2467; G11B7/247; G11B7/2472; G11B7/248; G11B7/253; G11B7/2531; G11B7/2533
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
72 words
An optical recording medium which performs recording and reproduction by irradiating a laser beam onto a recording layer, wherein the recording layer comprises at least a dye compound (A) having an absorption maximum near the wavelength of the recording laser beam and a reflective organic compound (B) which is a substance not having absorption necessary for recording relative to the recording laser beam but having high reflectance relative to the reproduction beam.
Claim 2
Dependent Claim
72 words
An optical recording medium which performs recording and reproduction by irradiating a laser beam onto a recording layer, wherein the recording layer comprises at least a dye compound (A) having an absorption maximum near the wavelength of the recording laser beam and a reflective organic compound (B) which is a substance not having absorption necessary for recording relative to the recording laser beam but having high reflectance relative to the reproduction beam.
Claim 3
Dependent Claim
38 words
An optical recording medium according to claim l, wherein said recording layer has an optical reflectance of l0 % or higher relative to the reproduction laser beam with the same wavelength as that of the recording laser beam.
Claim 4
Dependent Claim
38 words
An optical recording medium according to claim l, wherein said recording layer has an optical reflectance of l5 % or higher relative to the reproduction laser beam with the same wavelength as that of the recording laser beam.
Claim 5
Dependent Claim
90 words
An optical recording medium according to claim l, wherein the value of the absorption maximum wavelength of the dye compound (A) is within the range of ±50 nm of the wavelength of the recording laser beam, and the difference between the value of the absorption maximum wavelength of the dye compound (A) and the value of the wavelength of the recording laser beam is smaller than the difference between the value of the absorption maximum wavelength of the reflective organic compound (B) and the wavelength of the recording laser beam.
Claim 6
Dependent Claim
67 words
An optical recording medium according to claim 4, wherein the greatness of the difference between the value of the absorption maximum wavelength of the dye compound (A) and the value of the wavelength of the recording laser beam is l/2 or less of the difference between the value of the absorption maximum wavelength of the reflective organic compound (B) and the wavelength of the recording laser beam.
Claim 7
Dependent Claim
85 words
An optical recording medium which performs recording and reproduction by irradiation of a laser beam onto a recording layer, wherein the recording layer comprises a dye compound (A) and a reflective organic compound (B), said reflective organic compound having a reflectance of l0 % or higher relative to the light with absorption maximum wavelength of the dye compound (A), and said reflective organic compound (B) having a reflectance greater than that of the dye compound (A) relative to the light with said absorption maximum wavelength.
Claim 8
Dependent Claim
85 words
An optical recording medium which performs recording and reproduction by irradiation of a laser beam onto a recording layer, wherein the recording layer comprises a dye compound (A) and a reflective organic compound (B), said reflective organic compound having a reflectance of l0 % or higher relative to the light with absorption maximum wavelength of the dye compound (A), and said reflective organic compound (B) having a reflectance greater than that of the dye compound (A) relative to the light with said absorption maximum wavelength.
Claim 9
Dependent Claim
36 words
An optical recording medium according to claim 6, wherein said reflective organic compound (B) has a reflectance of l5 % or higher relative to the light with the absorption maximum wavelength of the dye compound (A).
Claim 10
Dependent Claim
57 words
An optical recording medium according to claim 6, wherein said reflective organic compound (B) has a reflectance relative to the light with the absorption maximum wavelength of the dye compound (A) which is greater than the value of the reflectance of the dye compound (A) relative to the light with said absorption maximum wavelength add 3 %.
References Cited (Backward Citations)
No citation records indexed.
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