US4290075A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical recording device having several ablative recording layers
Assignee: US Philips Corp
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Filing: 1979-07-16
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Granted: 1981-09-15
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Expires: 1999-07-16
Abstract
Abstract The invention relates to an optical recording device having a substrate plate which is provided on at least one side with a first ablative recording layer and a second ablative recording layer provided hereon, the second ablative recording layer having a higher surface energy than the second ablative recording layer. Both recording layers preferably comprise the same common metal, for example tellurium.
Inventors
- 👤 Bernardus A. J. Jacobs
- 👤 Adriaan W. De Poorter
- 👤 Pieter Zalm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:53
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/243; G11B2007/24302; G11B2007/24316; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31928
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
151 words
A device for the optical recording of information comprising a substrate plate having on at least one side an ablative recording layer which locally melts and forms holes as a result of exposure to laser light modulated in accordance with the information to be written, characterized in that on its surface remote from the substrate the ablative recording layer has a second ablative recording layer having a higher surface energy than the first recording layer, in which during operation of the device both recording layers melt and form liquid regions in the places exposed to the laser light and furthermore as a result of mixing of the recording layers in the liquid regions, a leap in the surface energy occurs at the circumferential edge thereof so that the molten recording material is drawn to the circumferential edge, wets the solid surface of the second recording layer and a hole is formed.
Claim 2
Independent Claim
151 words
A device for the optical recording of information comprising a substrate plate having on at least one side an ablative recording layer which locally melts and forms holes as a result of exposure to laser light modulated in accordance with the information to be written, characterized in that on its surface remote from the substrate the ablative recording layer has a second ablative recording layer having a higher surface energy than the first recording layer, in which during operation of the device both recording layers melt and form liquid regions in the places exposed to the laser light and furthermore as a result of mixing of the recording layers in the liquid regions, a leap in the surface energy occurs at the circumferential edge thereof so that the molten recording material is drawn to the circumferential edge, wets the solid surface of the second recording layer and a hole is formed.
Claim 3
Dependent Claim
52 words
A device as claimed in claim 1, characterized in that the surface energy of the second recording layer is at least 2% higher than that of the first recording layer, the thickness of the second recording layer being 1-20 nm and the thickness of the first recording layer being from 10-100 nm.
Claim 4
Dependent Claim
25 words
A device as claimed in claim 1, characterized in that first and second recording layers both comprise a metal, metal alloy or a chalcogenide glass.
Claim 5
Dependent Claim
76 words
A device as claimed in claim 1, characterized in that the device comprises an assembly of two transparent substrate plates each provided on one side with a first and a second ablative recording layer, in which the second ablative recording layer has a higher surface energy than the first recording layer and in which furthermore the recording layers of each substrate plate face each other and are connected together with the interposition of an annular spacer.
Claim 6
Dependent Claim
33 words
A device as claimed in claim 1, characterized in that on the side of the ablative recording layers the substrate has a non-ablative recording layer having a lower surface energy than the substrate.
Claim 7
Dependent Claim
59 words
A device as claimed in claim 1 or 5, characterized in that a transparent substrate having the recording layers on one side is used and is provided on the side of the recording layers with an optically readable servo track having at least partly a relief structure of servo regions situated alternately at a higher and a lower level.
Claim 8
Dependent Claim
57 words
A device as claimed in claim 1, characterized in that the same common metal is present in the first and the second recording layer, in which furthermore the first and/or second recording layer comprise additional components so that the surface energy of the second ablative recording layer is higher than that of the first ablative recording layer.
Claim 9
Dependent Claim
15 words
A device as claimed in claim 7, characterized in that the common metal is tellurium.
Claim 10
Dependent Claim
73 words
A device as claimed in claim 8, characterized in that the first recording layer comprises, in addition to tellurium, also sulphur and/or selenium and the second recording layer comprises, in addition to tellurium, also selenium and/or bismuth, in which for the case in which both recording layers comprise, in addition to tellurium, only selenium, the weight concentration of selenium in the first recording layer is higher than that in the second recording layer.
Claim 11
Dependent Claim
20 words
A device as claimed in claim 9, characterized in that the first and/or the second recording layer also comprise antimony.
Claim 12
Dependent Claim
90 words
A device as claimed in claim 10, characterized in that the first ablative recording layer consists of a compound of the formula Te p Sb q Se r S s wherein p has the value 20-70 q has the value 10-50 r has the value 5-40 s has the value 3-15, and p+q+r+s=100 and the second ablative recording layer consists of a compound of the formula Te x Sb y Se z wherein x has the value 20-97 y has the value 0-50 z has the value 3-50, and x+y+z=100.
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) | 1984-09-14 | 1985-03-16 | 1985-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-14 | 1989-03-16 | 1989-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-14 | 1993-03-16 | 1993-09-15 | $7700.00 | Window Closed / Lapsed |