Patent US4834819A successfully refreshed from Google Patents.
US4834819A
Expired / Lapsed
US
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Process for producing information recording discs
Assignee: Mitsui Chemicals Inc
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Filing: 1988-08-11
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Granted: 1989-05-30
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Expires: 2008-08-11
Abstract
Abstract A process for producing information recording discs of an air sandwich structure by ultrasonic welding together two disc substrates, at least one of which has a recording medium containing layer, through outer and inner peripheral spacers lying therebetween, which process is characterized in that the ultrasonic welding is carried out by the use of a horn and an anvil which are so designed that each of said horn and said anvil has a difference in height along the axial direction between its portion corresponding to the outer peripheral spacer and its portion corresponding to the inner peripheral spacer, wherein the sum of differences in height of said horn and said anvil corresponds to the difference in thickness between the outer peripheral poritons of said two disc substrates plus the outer peripheral spacer and the inner peripheral portions of said two disc substrates plus the inner peripheral spacer.
Inventors
- 👤 Akira Todo
- 👤 Toshio Kimura
- 👤 Masayoshi Kurisu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:54
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/26; B; B29; B29C; B29C65/00; B29C65/02; B29C65/08; B29C65/78; B29C65/7802; B29C65/7805; B29C65/7808; B29C65/7811; B29C65/7841; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/118; B29C66/20; B29C66/24; B29C66/242; B29C66/2422; B29C66/24221; B29C66/302; B29C66/3022; B29C66/30221; B29C66/30223; B29C66/3024; B29C66/40; B29C66/41; B29C66/45; B29C66/452; B29C66/47; B29C66/70; B29C66/73; B29C66/739; B29C66/7392; B29C66/73921; B29C66/80; B29C66/81; B29C66/814; B29C66/8141; B29C66/81411; B29C66/81425; B29C66/81427; B29C66/81431; B29C66/82; B29C66/824; B29C66/8242; B29C66/83; B29C66/832; B29C66/8322; B29D; B29D17/00; B29D17/005; G11B23/00; G11B23/0014; G11B23/0021; G11B7/24015; B29C66/71; B29C66/72; B29C66/723; B29L; B29L2017/00; B29L2017/001; B29L2017/003; B29L2017/005; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1089; Y10T156/1092; Y10T156/1093
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
148 words
A process for producing information recording discs of an air sandwich structure by ultrasonic welding together two disc substrates, at least one of which has a recording medium containing layer, through outer and inner peripheral spacers lying therebetween, which process is characterized in that the ultrasonic welding is carried out by the use of a horn and an anvil which are so designed that each of said horn and said anvil has a difference in height along the axial direction between its portion corresponding to the outer peripheral spacer and its portion corresponding to the inner peripheral spacer, wherein the sum of said differences in height of said horn and said anvil corresponds to the difference in thickness between the outer peripheral portions of said two disc substrates plus the outer peripheral spacer and the inner peripheral portions of said two disc substrates plus the inner peripheral spacer.
Claim 2
Dependent Claim
148 words
A process for producing information recording discs of an air sandwich structure by ultrasonic welding together two disc substrates, at least one of which has a recording medium containing layer, through outer and inner peripheral spacers lying therebetween, which process is characterized in that the ultrasonic welding is carried out by the use of a horn and an anvil which are so designed that each of said horn and said anvil has a difference in height along the axial direction between its portion corresponding to the outer peripheral spacer and its portion corresponding to the inner peripheral spacer, wherein the sum of said differences in height of said horn and said anvil corresponds to the difference in thickness between the outer peripheral portions of said two disc substrates plus the outer peripheral spacer and the inner peripheral portions of said two disc substrates plus the inner peripheral spacer.
Claim 3
Dependent Claim
21 words
The process as claimed in claim 1 wherein the outer and inner peripheral spacers both have projections on both surfaces thereof.
Claim 4
Dependent Claim
15 words
The process as claimed in claim 2 wherein the projections are arranged annularly but discontinuously.
References Cited (Backward Citations)
US4159220A
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US4564932A
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US4499477A
Cited
JPS60103537A
Cited
US4644520A
Cited
JPS62173234A
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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) | 1992-05-29 | 1992-11-28 | 1993-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-29 | 1996-11-28 | 1997-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-29 | 2000-11-28 | 2001-05-30 | $7700.00 | Window Closed / Lapsed |