US Patent No: 6,611,491
Number of patents in Portfolio can not be more than 2000
Optical recording medium having dual recording layers
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Aug 26, 2003
Issued date -
Jun 3, 2002
filing date -
10/162,392
serial no -
In Force
status
Importance
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Abstract
An optical information recording medium has a first information layer composed of at least three thin films, which is capable of reflecting a portion of incident light and permitting the passage of a portion of incident light. The optical recording medium also has a second information layer composed of at least four thin films. Information can be recorded on or reproduced from the second information layer with light that has passed through the first information layer. The first and second information layers are separated by a transparent separation layer. The first information layer may be composed of a first dielectric layer, a recording layer and a second dielectric layer, and the second information layer may be composed a third dielectric layer, a second recording layer, a fourth dielectric layer and a reflecting layer.
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First Claim
Related Publications
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
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| 5,381,401 Multiple data surface optical data storage system | 46 | 1993 | |
| 5,373,499 Multilayer optical disk and system having multiple optical paths include identical total disk substrate thickness | 53 | 1993 | |
| 5,499,231 Optical disk drive with multiple data layer disk and system for focusing the optical beam | 46 | 1994 | |
| 5,449,590 Multiple data surface optical data storage system | 25 | 1995 | |
| 5,513,170 Multiple data surface optical data storage system | 16 | 1995 | |
| 5,555,537 Optical data storage system with multiple write-once phase-change recording layers | 37 | 1995 | |
| 5,745,473 Multiple data layer optical disk with recorded information identifying the type of tracking | 8 | 1997 | |
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| 5,263,011 Optical recording and reproducing apparatus and recording medium having multilayer recording membranes | 50 | 1991 | |
| 5,428,597 Multi-layered optical disk with track and layer identification | 69 | 1994 | |
| 5,627,816 Multilayer optical disk and apparatus | 21 | 1995 | |
| 6,031,813 Optical recording medium having dual information surfaces | 16 | 1999 | |
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| 4,815,060 Optical pickup device with tracking and focusing utilizing a photodetector having four regions | 20 | 1987 | |
| 5,126,996 Optical information record carrier and the method of producing the same | 65 | 1989 | |
| 5,485,452 Optical information recording medium | 56 | 1994 | |
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| 4,188,433 Record carrier in disk form having cover layers | 37 | 1978 | |
| 4,450,553 Multilayer information disc | 189 | 1979 | |
| 5,511,057 Multiplane information storage system with an improved record carrier | 23 | 1993 | |
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| 4,866,672 Information-recording thin film and method for recording and reproducing information | 16 | 1988 | |
| 5,235,591 Stack type optical disc apparatus, sealed and separate type optical head therefor and optical disc medium | 21 | 1991 | |
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| 4,800,112 Optical recording medium | 26 | 1987 | |
| 4,990,208 Method of manufacturing an optical recording medium | 37 | 1990 | |
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| 5,059,473 Optical recording medium and manufacturing method thereof | 26 | 1989 | |
| 4,917,751 Method of producing double sided optical memory disks | 21 | 1989 | |
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| 5,764,621 Optical disc with a plurality of recording layers | 39 | 1995 | |
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| 4,310,919 Optical video disc structure | 33 | 1979 | |
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| 5,828,648 Optical information recording medium and method of manufacturing | 39 | 1997 | |
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| 5,540,966 Dual layer optical medium having partially reflecting thin film layer | 39 | 1994 | |
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| 5,808,989 Optical disk recording and/or reproducing apparatus for performing optimizing operation for servo control with recording and/or reproducing operation | 26 | 1997 | |
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| 5,318,653 Optical disc and method and apparatus for making same | 29 | 1992 | |
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| 5,023,439 Arrangement for detecting a signal for effecting a focus control of an optical head | 10 | 1989 | |
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| 5,768,221 Method of and apparatus for initializing multi-layer optical recording medium | 52 | 1996 | |
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| 5,200,948 Recording method and apparatus | 14 | 1989 | |
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| 5,093,174 Optical recording medium | 76 | 1990 | |
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| 5,013,107 Polarization selective holographic optical element | 39 | 1988 | |
| 5,251,198 Reading device for multi-layered optical information carrier | 91 | 1992 | |
Patent Citation Ranking
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Feb 26, 2015 |
| Fee | Large entity fee | small entity fee | micro entity fee |
|---|---|---|---|
| Surcharge - 11.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
| Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |