US3889272A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal film recording media for laser writing
Assignee: AT&T Inc
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Filing: 1974-05-30
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Granted: 1975-06-10
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Expires: 1994-05-30
Abstract
Abstract Thin metal film systems supported on transparent substrates are described for use in laser micromachining of high resolution facsimile images. An anti-reflection film, which requires less energy for micromachining than bismuth films of equal optical opacity, is provided by forming a thin layer of fine-grain crystallites of the metal between the incident laser radiation and a layer of coarse-grain crystallites of the metal.
Inventors
- 👤 David Yuan Kong Lou
- 👤 Ronald Howard Willens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:10
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/257; B; B41; B41M; B41M5/00; B41M5/24; G11B7/242; G11B7/243; G11B2007/24302; G11B2007/2431; G11B2007/24314; G11B2007/25705; G11B2007/25715
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
73 words
A METHOD FOR RECORDING INFORMATION IN A METAL FILM RECORDING MEDIUM BY SELECTIVELY REMOVING PORTIONS OF A THIN METAL RADIATION-ABSORBING FILM SUPPORTED ON A FLEXIBLE TRANSPARENT SUBSTRATE, THE METHOD COMPRISING EXPOSING THE METAL RADIATION-ABSORBING FILM TO MODULATED COHERENT RADIATION OF SUFFICIENT POWER AND DURATION TO REMOVE THE PORTIONS, CHARACTERIZED IN THAT THE FILM COMPRISES A FIRST LAYER OF FINE-GRAIN CRYSTALLITES OF THE METAL AND A SECOND LAYER OF COARSE-GRAIN CRYSTALLITIES OF THE METAL.
Claim 2
Independent Claim
73 words
A METHOD FOR RECORDING INFORMATION IN A METAL FILM RECORDING MEDIUM BY SELECTIVELY REMOVING PORTIONS OF A THIN METAL RADIATION-ABSORBING FILM SUPPORTED ON A FLEXIBLE TRANSPARENT SUBSTRATE, THE METHOD COMPRISING EXPOSING THE METAL RADIATION-ABSORBING FILM TO MODULATED COHERENT RADIATION OF SUFFICIENT POWER AND DURATION TO REMOVE THE PORTIONS, CHARACTERIZED IN THAT THE FILM COMPRISES A FIRST LAYER OF FINE-GRAIN CRYSTALLITES OF THE METAL AND A SECOND LAYER OF COARSE-GRAIN CRYSTALLITIES OF THE METAL.
Claim 3
Dependent Claim
46 words
An anti-reflection film coating on a surface of a metal radiation-absorbing film for reducing reflectance of incident radiation, characterized in that the anti-reflection film comprises at least a layer of fine-grain crystallites of the metal interposed between the incident radiation and coarse-grain crystallites of the metal.
Claim 4
Dependent Claim
46 words
An anti-reflection film coating on a surface of a metal radiation-absorbing film for reducing reflectance of incident radiation, characterized in that the anti-reflection film comprises at least a layer of fine-grain crystallites of the metal interposed between the incident radiation and coarse-grain crystallites of the metal.
Claim 5
Dependent Claim
58 words
A metal film recording medium for recording information by exposure of the medium to a laser beam, the medium comprising a flexible transparent substrate and a metal radiation-absorbing film formed on the substrate, characterized in that the film comprises at least a layer of fine-grain crystallites of the metal and a layer of coarse-grain crystallites of the metal.
Claim 6
Dependent Claim
58 words
A metal film recording medium for recording information by exposure of the medium to a laser beam, the medium comprising a flexible transparent substrate and a metal radiation-absorbing film formed on the substrate, characterized in that the film comprises at least a layer of fine-grain crystallites of the metal and a layer of coarse-grain crystallites of the metal.
Claim 7
Dependent Claim
44 words
The medium of claim 3 in which the grain size of the layer of fine-grain crystallites ranges from about 50 Angstroms to 300 Angstroms and in which the thickness of the layer of the fine-grain crystallites ranges from about 100 Angstroms to 400 AngStroms.
Claim 8
Dependent Claim
31 words
The medium of claim 4 in which the layer of coarse-grain crystallites is formed on the substrate and the layer of fine-grain crystallites is formed on the layer of coarse-grain crystallites.
Claim 9
Dependent Claim
31 words
The medium of claim 4 in which the layer of fine-grain crystallites is formed on the substrate and the layer of coarse-grain crystallites is formed on the layer of fine-grain crystallites.
Claim 10
Dependent Claim
30 words
The medium of claim 6 in which the film additionally comprises a layer of MgxIn1-x, where x is about 0.30, interposed between the layer of fine-grain crystallites and the substrate.
Claim 11
Dependent Claim
19 words
The medium of claim 5 in which the layer of MgxIn1-x has a maximum thickness of about 50 Angstroms.
Claim 12
Dependent Claim
15 words
The medium of claim 3 in which the metal radiation-absorbing film is bismuth or tin.
Claim 13
Dependent Claim
13 words
The medium of claim 9 in which the metal radiation-absorbing film is bismuth.
Claim 14
Dependent Claim
19 words
The medium of claim 3 in which the medium has an optical density ranging from about 1 to 3.
Claim 15
Dependent Claim
14 words
The medium of claim 3 in which the transparent substrate is a polyester film.
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) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |