US4920359A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical information recording medium having protective layer
Assignee: Taiyo Yuden Co Ltd
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Filing: 1989-07-03
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Granted: 1990-04-24
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Expires: 2009-07-03
Abstract
Abstract An optical information recording medium comprising a substrate, an optical recording layer formed over the surface of the substrate, and a protective layer covering the optical recording layer. The protective layer incorporates an antireflection means, such as a laser beam absorbing means, a laser beam scattering means or a laser beam transmitting means, for preventing the reflection of a laser beam applied to the optical recording layer. An optical information recording medium of a second embodiment of the present invention, comprises a substrate, an optical recording layer formed over the surface of the substrate, a protective layer covering the optical recording layer, and a buffer layer interposed between the optical recording layer and the protective layer. At least one of the protective layer or the buffer layer incorporates at least one antireflection means, such as a laser beam absorbing means, a laser beam scattering means and a laser beam transmitting means, for preventing the reflection of a laser beam. The buffer layer facilitates precisely forming recording bits in the optical recording layer by locally deforming the optical recording layer by a laser beam.
Inventors
- 👤 Yuji Arai
- 👤 Emiko Hamada
- 👤 Yuaki Shin
- 👤 Takashi Ishiguro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:53
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/257; G11B7/2572; G11B7/2575; G11B7/254; G11B7/2542; G11B7/242; G11B7/243; G11B2007/24302; G11B2007/24312; G11B2007/24316; G11B7/244; G11B7/246; G11B7/247; G11B7/2472; G11B7/248; G11B7/249; G11B7/253; G11B7/2533; G11B7/2534; Y; Y10; Y10S; Y10S430/00; Y10S430/146; Y10S430/151
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
80 words
An optical information recording medium comprising: a substrate; an optical recording layer formed over the surface of the substrate; a protective layer covering the optical recording layer, said protective layer having incorporated therein antireflection means for preventing the reflection of a laser beam, said antireflection means being means for absorbing the laser beam in combination with means for scattering the laser beam; and a buffer layer made of gaseous matter interposed between the optical recording layer and the protective layer.
Claim 2
Dependent Claim
80 words
An optical information recording medium comprising: a substrate; an optical recording layer formed over the surface of the substrate; a protective layer covering the optical recording layer, said protective layer having incorporated therein antireflection means for preventing the reflection of a laser beam, said antireflection means being means for absorbing the laser beam in combination with means for scattering the laser beam; and a buffer layer made of gaseous matter interposed between the optical recording layer and the protective layer.
Claim 3
Dependent Claim
95 words
An optical information recording medium comprising: a substrate; an optical recording layer formed over the surface of the substrate; a protective layer covering the optical recording layer, said protective layer having incorporated therein antireflection means for preventing the reflection of a laser beam, said antireflection means being a member selected from the group consisting of means for scattering the laser beam and means for scattering a laser beam in combination with means for transmitting the laser beam; and a buffer layer made of gaseous matter interposed between the optical recording layer and the protective layer.
Claim 4
Dependent Claim
95 words
An optical information recording medium comprising: a substrate; an optical recording layer formed over the surface of the substrate; a protective layer covering the optical recording layer, said protective layer having incorporated therein antireflection means for preventing the reflection of a laser beam, said antireflection means being a member selected from the group consisting of means for scattering the laser beam and means for scattering a laser beam in combination with means for transmitting the laser beam; and a buffer layer made of gaseous matter interposed between the optical recording layer and the protective layer.
Claim 5
Dependent Claim
26 words
An optical information recording medium as claimed in claim 2, wherein said means for scattering the laser beam comprises a roughened surface of said protective layer.
Claim 6
Dependent Claim
90 words
An optical information recording medium comprising: a substrate; an optical recording layer formed over the surface of the substrate; a protective layer covering the optical recording layer; and a buffer layer interposed between the optical recording layer and the protective layer, said buffer layer having incorporated therein antireflection means for preventing the reflection of a laser beam, said antireflection means being two or more members selected from the group consisting of means for absorbing the laser beam, means for scattering the laser beam and means for transmitting the laser beam.
Claim 7
Dependent Claim
90 words
An optical information recording medium comprising: a substrate; an optical recording layer formed over the surface of the substrate; a protective layer covering the optical recording layer; and a buffer layer interposed between the optical recording layer and the protective layer, said buffer layer having incorporated therein antireflection means for preventing the reflection of a laser beam, said antireflection means being two or more members selected from the group consisting of means for absorbing the laser beam, means for scattering the laser beam and means for transmitting the laser beam.
Claim 8
Dependent Claim
59 words
An optical information recording medium as claimed in claim 4, wherein said means for scattering the laser beam comprises a roughened surface of said buffer layer and said means for transmitting the laser beam comprises said buffer layer having a stepwise or continuous increase in refractive index from the side facing the optical recording layer to the other side.
Claim 9
Dependent Claim
114 words
An optical information recording medium comprising: a substrate; an optical recording layer formed over the surface of the substrate; a protective layer covering the optical recording layer, said protective layer having incorporated therein antireflection means for preventing the reflection of a laser beam, said antireflection means comprising one or more members selected from the group consisting of means for absorbing the laser beam, means for scattering the laser beam and means for transmitting the laser beam; and a buffer layer interposed between the optical recording layer and the protective layer, said buffer layer having a stepwise or continuous increase in refractive index from the side facing the optical recording layer to the other side.
Claim 10
Dependent Claim
114 words
An optical information recording medium comprising: a substrate; an optical recording layer formed over the surface of the substrate; a protective layer covering the optical recording layer, said protective layer having incorporated therein antireflection means for preventing the reflection of a laser beam, said antireflection means comprising one or more members selected from the group consisting of means for absorbing the laser beam, means for scattering the laser beam and means for transmitting the laser beam; and a buffer layer interposed between the optical recording layer and the protective layer, said buffer layer having a stepwise or continuous increase in refractive index from the side facing the optical recording layer to the other side.
Claim 11
Dependent Claim
43 words
An optical information recording medium as claimed in claim 6, wherein said antireflection means incorporated into said protective layer is one or more members selected from the group consisting of means for absorbing a laser beam and means for scattering the laser beam.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-23 | 1993-10-23 | 1994-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-23 | 1997-10-23 | 1998-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-23 | 2001-10-23 | 2002-04-24 | $7700.00 | Window Closed / Lapsed |