US4606017A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical recording disc
Assignee: US Philips Corp
•
Filing: 1983-06-13
•
Granted: 1986-08-12
•
Expires: 2003-06-13
Abstract
Abstract Optical recording disc having successively a transparent substrate plate, a first layer of a formstable synthetic resin comprising an optically readable information track, a second thin layer of a linearly polymerized amorphous synthetic resin and a recording layer in which optically readable information bits are formed by exposure to modulated laser light.
Inventors
- 👤 Dirk J. Broer
- 👤 Leendert Vriens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:41
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/244; G11B7/246; G11B7/243; G11B7/2433; G11B2007/24302; G11B2007/24306; G11B2007/2431; G11B2007/24312; G11B2007/24314; G11B2007/24316; G11B7/252; G11B7/253; G11B7/2531; G11B7/258; G11B7/2585
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
128 words
An optical recording disc comprising a transparent substrate plate which on at least one side comprises a layer of a transparent formstable synthetic resin in which an optically readable information track is provided and which on the side of the layer of dimensionally stable synthetic resin comprises a recording layer in which recording layer optically readable information bits are formed by exposure to modulated laser light, characterized in that a thin synthetic resin layer of a linearly polymerized amorphous synthetic resin is provided between the layer of transparent formstable synthetic resin and the recording layer, the thin layer following the contours of the information track and reducing the energy which is minimally required to form an information bit in the recording layer by means of the laser light.
Claim 2
Dependent Claim
128 words
An optical recording disc comprising a transparent substrate plate which on at least one side comprises a layer of a transparent formstable synthetic resin in which an optically readable information track is provided and which on the side of the layer of dimensionally stable synthetic resin comprises a recording layer in which recording layer optically readable information bits are formed by exposure to modulated laser light, characterized in that a thin synthetic resin layer of a linearly polymerized amorphous synthetic resin is provided between the layer of transparent formstable synthetic resin and the recording layer, the thin layer following the contours of the information track and reducing the energy which is minimally required to form an information bit in the recording layer by means of the laser light.
Claim 3
Dependent Claim
26 words
An optical recording disc as claimed in claim 1, characterized in that the thin layer of synthetic resin has a thickness of at most 200 nm.
Claim 4
Dependent Claim
30 words
An optical recording disc as claimed in claim 1 characterized in that the thin layer of synthetic resin is manufactured from a linearly polymerised acrylate-, methacrylate- or styrene synthetic resin.
Claim 5
Dependent Claim
60 words
An optical recording disc as claimed in claim 1 having a substrate plate of glass which on one side comprises a layer of a crosslinked acrylate synthetic resin in which an optically readable information track is provided, which layer is provided successively with a thin layer of a linearly polymerised acrylate-, methacrylate or styrene synthetic resin and a recording layer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-11 | 1990-02-10 | 1990-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-11 | 1994-02-10 | 1994-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-11 | 1998-02-10 | 1998-08-12 | $7700.00 | Window Closed / Lapsed |