US4615969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for making a stamping master for video disk replication
Assignee: Energy Conversion Devices Inc
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Filing: 1984-04-25
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Granted: 1986-10-07
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Expires: 2004-04-25
Abstract
Abstract There is disclosed a new and improved method for making a stamping master for video disk replication wherein a film of material which is reversibly convertible between two stable states, one having a high electrical conductivity and the other having a low electrical conductivity, is deposited on a substrate while in one of the states. The material is then imaged with information in coded form by converting selected areas of the film to the other state in a predetermined pattern corresponding to the coded information. The conversion can be accomplished by light, electromagnetic energy or heat. At this stage, an intermediate subassembly, composed of the imaged film on the substrate, is formed which can be read for accuracy by detecting the state of the selectively converted areas with respect to the rest of the film. Corrections can be made by converting the state of selected areas of the film as required. A metal, such as nickel, is then electroplated onto the areas of the film which are in the high conductivity state. The plating is continued until the nickel spans the areas of the film on which it did not directly plate. In this way a continuous backing layer which is integral with the plated nickel is formed. The nickel is then separated from the imaged material to provide a first stamping master which is used to form a second stamping master of opposite polarity to the first, preferably by a similar plating onto the first master. The second stamping master is used directly for video disk replication.
Inventors
- 👤 David A. Strand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:04
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/26; G11B23/00; G11B23/0057; Y; Y10; Y10S; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
142 words
A method of making a stamping master to facilitate video disk replication comprising: (a) providing a substrate; (b) depositing a thin film of material over said substrate, said material being reversibly convertible at least twice between a state of high electrical conductivity and a state of low electrical conductivity, said film being deposited in one of said states; (c) converting selected areas of said film from one of said states to the other said state in a predetermined pattern; (d) depositing at least one additional material onto at least a portion of said areas of said film corresponding to one of said states; (e) forming a continuous backing layer over at least part of said additional material; and (f) separating said backing layer and said additional material from said film, said backing layer and said additional material forming a first stamping master.
Claim 2
Independent Claim
142 words
A method of making a stamping master to facilitate video disk replication comprising: (a) providing a substrate; (b) depositing a thin film of material over said substrate, said material being reversibly convertible at least twice between a state of high electrical conductivity and a state of low electrical conductivity, said film being deposited in one of said states; (c) converting selected areas of said film from one of said states to the other said state in a predetermined pattern; (d) depositing at least one additional material onto at least a portion of said areas of said film corresponding to one of said states; (e) forming a continuous backing layer over at least part of said additional material; and (f) separating said backing layer and said additional material from said film, said backing layer and said additional material forming a first stamping master.
Claim 3
Dependent Claim
20 words
The method as defined in claim 1 wherein the step of depositing said thin film includes depositing by vacuum deposition.
Claim 4
Dependent Claim
31 words
The method as defined in claim 1 wherein said step of depositing said thin film includes depositing said film to a thickness of from about 300 Å to about 3000 Å.
Claim 5
Dependent Claim
26 words
The method as defined in claim 1 wherein said step of depositing said thin film includes depositing said thin film in said high electrical conductivity state.
Claim 6
Dependent Claim
25 words
The method as defined in claim 1 wherein said step of depositing said thin film includes depositing said film in said low electrical conductivity state.
Claim 7
Dependent Claim
23 words
The method as defined in claim 5 wherein said step of depositing said thin film includes depositing said film in an amorphous state.
Claim 8
Dependent Claim
40 words
The method as defined in claim 4 wherein said step of converting selected areas of said film from said first state to said second state includes converting said selected areas from said high conductivity state to a low conductivity state.
Claim 9
Dependent Claim
32 words
The method as defined in claim 7 wherein said step of depositing said additional material includes depositing said additional material only onto at least a portion of said areas of high conductivity.
Claim 10
Dependent Claim
49 words
The method as defined in claim 5 comprising the further step of converting said deposited low electrical conductivity film in bulk to said high electrical conductivity state before the step of converting selected areas of said film from one of said states to the other in a predetermined pattern.
Claim 11
Dependent Claim
40 words
The method as defined in claim 9 wherein said step of converting selected areas of said film from said first state to said second state includes converting said selected areas from said high conductivity state to said low conductivity state.
Claim 12
Dependent Claim
33 words
The method as defined in claim 10 wherein said step of depositing said additional material includes depositing said additional material only onto at least a portion of said areas of said high conductivity.
Claim 13
Dependent Claim
45 words
The method as defined in claim 6 comprising the further step of converting said deposited amorphous film in bulk to a crystalline state before the step of converting selected areas of said film from one of said states to the other in a predetermined pattern.
Claim 14
Dependent Claim
38 words
The method as defined in claim 12 wherein said step of converting selected areas of said film from said first state to said second state includes converting said selected areas from said crystalline state to said amorphous state.
Claim 15
Dependent Claim
33 words
The method as defined in claim 13 wherein said step of depositing said additional material includes depositing said additional material only onto at least a portion of said areas in said crystalline state.
Claim 16
Dependent Claim
33 words
The method as defined in claim 1 wherein said step of converting selected areas of said film from said first state to said second state includes converting micro-sized areas to said second state.
Claim 17
Dependent Claim
17 words
The method as defined in claim 1 wherein said step of depositing said additional material includes electroplating.
Claim 18
Dependent Claim
47 words
The method as defined in claim 1 wherein said step of forming said backing layer includes continuing the deposition of said additional material until said deposited additional material forms said continuous backing layer over those areas of said film on which said additional material is not deposited.
Claim 19
Dependent Claim
37 words
The method as defined in claim 1 wherein said step of converting areas of said film from one of said states to the other said state includes focusing electromagnetic energy on said film in said predetermined pattern.
Claim 20
Dependent Claim
30 words
The method as defined in claim 1 comprising the further step of forming a reversed duplicate from said first stamping master to provide a second stamping master of opposite polarity.
Claim 21
Dependent Claim
81 words
The method as defined in claim 19 wherein said step of forming said second stamping master of opposite polarity comprises the further steps of: (a) depositing further material onto said additional material of said first stamping master; (b) forming a continuous support layer over at least part of said further material; and (c) separating said continuous support layer and said further material from said first stamping master to form said reversed duplicate to provide said second stamping master of opposite polarity.
Claim 22
Dependent Claim
28 words
The method as defined in claim 1 wherein said high conductivity state of said thin film is approximately four orders of magnitude greater than said low conductivity state.
Claim 23
Dependent Claim
14 words
The method as defined in claim 1 wherein said additional material includes metallic material.
Claim 24
Dependent Claim
13 words
The method as defined in claim 22 wherein said metallic material includes nickel.
Claim 25
Dependent Claim
14 words
The method as defined in claim 20 wherein said further material includes metallic material.
Claim 26
Dependent Claim
13 words
The method as defined in claim 24 wherein said metallic material includes nickel.
Claim 27
Dependent Claim
44 words
The method as defined in claim 20 wherein said step of depositing said further material onto said additional material of said first stamping master includes depositing said further material only onto at least a portion of said additional material of said first stamping master.
Claim 28
Dependent Claim
37 words
The method as defined in claim 26 wherein said portion of said additional material of said first stamping master is that portion which corresponds to said selected areas of said thin film in one of said states.
Claim 29
Dependent Claim
62 words
The method as defined in claim 20 wherein said step of forming said continuous support layer includes the step of continuing the deposition of said further material until said deposited further material forms said continuous support layer over those areas of said first stamping master which correspond to those areas of said thin film on which said additional material was not deposited.
Claim 30
Dependent Claim
13 words
The method as defined in claim 1 wherein said substrate further comprises glass.
Claim 31
Dependent Claim
23 words
The method as defined in claim 29 wherein said glass substrate is polished to a surface flatness of approximately one-half wave per inch.
Claim 32
Dependent Claim
24 words
The method as defined in claim 1 further comprising the step of depositing a delaminating layer on said substrate before depositing said thin film.
Claim 33
Dependent Claim
23 words
The method as defined in claim 31 wherein said step of depositing said delaminating layer includes depositing a delaminating layer which comprises polyurethane.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-10-06 | 1990-04-07 | 1990-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-06 | 1994-04-07 | 1994-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-06 | 1998-04-07 | 1998-10-07 | $7700.00 | Window Closed / Lapsed |