US Patent No: 5,497,367
Number of patents in Portfolio can not be more than 2000
Optical recording medium
Stats
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Mar 5, 1996
Issued date -
Sep 1, 1992
filing date -
07/939,031
serial no -
In Force
status
Importance
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Abstract
An optical storage medium provided with both a read-write area in which read-write data can be rewritably stored and a read-only area in which read-write data is previously stored in an unerasable manner. In the read-write area, a guide track is previously formed for tracking control, and read-write data is rewritably stored, for example photomagnetically, along the guide track. In the read-only area, data is stored along a read-only track that is offset over a portion of its length in a direction lateral to the track direction to represent the read-only data. This read-only data may be reproduced by detecting the laser light radiated from an optical pickup and reflected by the medium by a two-segment photodetector.
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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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| 4,501,000 Method of coding binary data | 43 | 1981 | |
| 4,775,968 Tracking error detecting system for optical head | 43 | 1986 | |
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| 4,907,216 Optical record carrier having position indentifying track modulation | 42 | 1987 | |
| 5,090,007 Optically inscribable record carrier with prerecorded information | 6 | 1989 | |
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| 4,716,560 Recording disc and method for fabricating same | 18 | 1985 | |
| 4,769,802 Information recording medium disc and method and apparatus for recording/reproducing information using the disc | 23 | 1985 | |
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| 4,797,752 Information storage carrier and method for storing duplicate information | 145 | 1984 | |
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| 5,150,339 Optical disk medium and its application method and system | 69 | 1990 | |
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| 5,173,886 Composite optical disc having both a data read-only area and a data rewritable area, and a recording/reproducing system for use therewith | 58 | 1990 | |
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| 4,940,618 Optical information recording medium | 54 | 1989 | |