US4953385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Information storage stamper and method of manufacturing disks using the same
Assignee: Panasonic Holdings Corp
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Filing: 1989-08-22
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Granted: 1990-09-04
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Expires: 2009-08-22
Abstract
Abstract On a cemented carbide alloy disk or a cermet disk having been coated with either an iridium (Ir) alloy film or a ruthenium (Ru) alloy film is formed guide grooves by photography or ECR ion etching. The disk thus obtained is used as an optical or magnetic disk stamper. Next, a glass or aluminium disk is placed between a pair of stampers obtained as above and molded under pressure while heating thereby to make guide grooves of an optical or magnetic disk.
Inventors
- 👤 Masaki Aoki
- 👤 Hideo Torii
- 👤 Kiyoshi Kuribayashi
- 👤 Hideto Monji
- 👤 Makoto Umetani
- 👤 Eiji Fujii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:52
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/26; G11B5/00; G11B5/84; Y; Y10; Y10S; Y10S425/00; Y10S425/81
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
50 words
An information storage disk stamper-comprising a mother disk comprising, a cemented carbide alloy containing a tungsten carbide (WC) or a chromium carbide (Cr 3 C 2 ) or a cermet, and an iridium (Ir) alloy film coated on said mother disk and having formed thereon guide grooves for tracking servo.
Claim 2
Dependent Claim
50 words
An information storage disk stamper-comprising a mother disk comprising, a cemented carbide alloy containing a tungsten carbide (WC) or a chromium carbide (Cr 3 C 2 ) or a cermet, and an iridium (Ir) alloy film coated on said mother disk and having formed thereon guide grooves for tracking servo.
Claim 3
Dependent Claim
40 words
An information storage disk stamper as claimed in claim 1, wherein said iridium alloy film comprises at least one of iridium (Ir)- platinum (Pt) alloy, iridium (Ir)-rhodium (Rh) alloy, iridium (Ir)- osmium (Os) alloy and iridium (Ir)- rhenium (Re) alloy.
Claim 4
Dependent Claim
55 words
An information storage disk stamper comprising a mother disk comprising a cemented carbide alloy containing a tungsten carbide (WC) or a chromium carbide (Cr 3 C 2 ) as a main constituent or a cermet, and a ruthenium (Ru) alloy film coated on said mother disk and having formed thereon guide grooves for tracking servo.
Claim 5
Dependent Claim
55 words
An information storage disk stamper comprising a mother disk comprising a cemented carbide alloy containing a tungsten carbide (WC) or a chromium carbide (Cr 3 C 2 ) as a main constituent or a cermet, and a ruthenium (Ru) alloy film coated on said mother disk and having formed thereon guide grooves for tracking servo.
Claim 6
Dependent Claim
50 words
An information storage disk stamper as claimed in claim 3, wherein said ruthenium alloy film comprises at least one of ruthenium (Ru) - platinum (Pt) alloy, ruthenium (Ru) - rhodium (Rh) alloy, ruthenium (Ru) - osmium (Os) alloy, ruthenium (Ru) - iridium (Ir) alloy and ruthenium (Ru)- rhenium (Re) alloy.
Claim 7
Independent Claim
77 words
A method of manufacturing an information storage disk comprising the steps of: heating, a pair of information storage stampers each comprising a cemented carbide alloy or cermet mother disk coated with an iridium (Ir) alloy film; placing a glass or aluminium (Al) disk between said pair of stampers; and applying a pressure to said pair of stampers thereby to transfer a guide groove formed on one of said pair of stampers to said glass or aluminium disk.
Claim 8
Independent Claim
77 words
A method of manufacturing an information storage disk comprising the steps of: heating, a pair of information storage stampers each comprising a cemented carbide alloy or cermet mother disk coated with an iridium (Ir) alloy film; placing a glass or aluminium (Al) disk between said pair of stampers; and applying a pressure to said pair of stampers thereby to transfer a guide groove formed on one of said pair of stampers to said glass or aluminium disk.
Claim 9
Independent Claim
90 words
A method of manufacturing an information storage disk stamper comprising the steps of: spin-coating a negative type resist on a cemented carbide alloy or cermet mother disk coated with a ruthenium (Ru) alloy film; pre-baking the resist; drawing a guide groove pattern, for tracking servo on said resist by either laser beam exposure or electron beam exposure; developing the resist; etching a part of the ruthenium (Ru) alloy film by dry-etching; removing the resist; and removing all the resist and a part of the ruthenium (Ru) alloy film by dry-etching.
Claim 10
Independent Claim
90 words
A method of manufacturing an information storage disk stamper comprising the steps of: spin-coating a negative type resist on a cemented carbide alloy or cermet mother disk coated with a ruthenium (Ru) alloy film; pre-baking the resist; drawing a guide groove pattern, for tracking servo on said resist by either laser beam exposure or electron beam exposure; developing the resist; etching a part of the ruthenium (Ru) alloy film by dry-etching; removing the resist; and removing all the resist and a part of the ruthenium (Ru) alloy film by dry-etching.
Claim 11
Independent Claim
66 words
A method of manufacturing an information storage disk stamper comprising the steps of: spin-coating a negative type resist on a cemented carbide alloy or cermet mother disk coated with an iridium (Ir) alloy film; pre-baking the resist; drawing guide groove pattern for tracking servo by laser-exposure on the resist; developing the resist; etching, the iridium (Ir) alloy film by ECR ion etching; and removing the resist.
Claim 12
Independent Claim
66 words
A method of manufacturing an information storage disk stamper comprising the steps of: spin-coating a negative type resist on a cemented carbide alloy or cermet mother disk coated with an iridium (Ir) alloy film; pre-baking the resist; drawing guide groove pattern for tracking servo by laser-exposure on the resist; developing the resist; etching, the iridium (Ir) alloy film by ECR ion etching; and removing the resist.
Claim 13
Independent Claim
73 words
A method of manufacturing an information storage disk comprising the steps of: placing a glass or aluminium (Al) disk in position between a pair of information storage disk stampers each comprising a cemented carbide alloy or cermet mother disk coated with a ruthenium (Ru) alloy film; heating; and applying a pressure thereby transferring a guide groove formed on one of said pair of stampers on the surface of said glass or aluminium disk.
Claim 14
Independent Claim
73 words
A method of manufacturing an information storage disk comprising the steps of: placing a glass or aluminium (Al) disk in position between a pair of information storage disk stampers each comprising a cemented carbide alloy or cermet mother disk coated with a ruthenium (Ru) alloy film; heating; and applying a pressure thereby transferring a guide groove formed on one of said pair of stampers on the surface of said glass or aluminium disk.
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) | 1993-09-03 | 1994-03-05 | 1994-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-03 | 1998-03-05 | 1998-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-03 | 2002-03-05 | 2002-09-04 | $7700.00 | Window Closed / Lapsed |