US4917751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing double sided optical memory disks
Assignee: Sharp Corp
•
Filing: 1989-03-20
•
Granted: 1990-04-17
•
Expires: 2009-03-20
Abstract
Abstract Double sided optical memory disks are produced by dropping a viscous adhesive material hardenable by ultraviolet radiation at predetermined longitudinal intervals onto an elongated cloth material of uniform thickness thereby causing the adhesive material to become absorbed by and contained in the cloth material, thereafter placing this cloth material sandwichedly between two optical disk pieces each containing a recording layer, thereafter applying pressure between these pieces such that the sandwiching pieces remain separated uniformly by a predetermined separation distance, and thereafter applying ultraviolet radiation to and thereby hardening the adhesive material while the disk pieces are maintained at the uniform separation distance.
Inventors
- 👤 Kenji Ohta
- 👤 Hiroyuki Katayama
- 👤 Akira Takahashi
- 👤 Yoshiteru Murakami
- 👤 Junji Hirokane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:29
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/26; B; B29; B29C; B29C35/00; B29C35/02; B29C35/08; B29C70/00; B29C70/04; B29C70/06; B29C70/08; B29C70/086; B29C35/0805; B29C2035/0827; B29L; B29L2017/00; B29L2017/001; B29L2017/003; B29L2017/005; G11B11/00; G11B11/10; G11B11/105; G11B11/10582; G11B11/10584; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1089; Y10T156/1092; Y10T156/1097; Y10T156/1098
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
140 words
A method of producing double sided optical memory disks comprising the steps of dropping a viscous adhesive material hardenable by ultraviolet radiation at predetermined longitudinal intervals onto an elongated cloth material of uniform thickness so as to cause said adhesive material to become absorbed by and contained in said cloth material, thereafter placing said cloth material sandwichedly between a first optical disk piece and a second optical disk piece, each of said optical disk pieces containing a recording layer, thereafter applying pressure between said first and second optical disk pieces with said cloth material sandwiched therebetween such that said first and second optical disk pieces remain separated uniformly by a predetermined separation distance, and thereafter applying ultraviolet radiation to and thereby hardening said adhesive material while said first and second optical disk pieces are maintained at said uniform separation distance.
Claim 2
Independent Claim
140 words
A method of producing double sided optical memory disks comprising the steps of dropping a viscous adhesive material hardenable by ultraviolet radiation at predetermined longitudinal intervals onto an elongated cloth material of uniform thickness so as to cause said adhesive material to become absorbed by and contained in said cloth material, thereafter placing said cloth material sandwichedly between a first optical disk piece and a second optical disk piece, each of said optical disk pieces containing a recording layer, thereafter applying pressure between said first and second optical disk pieces with said cloth material sandwiched therebetween such that said first and second optical disk pieces remain separated uniformly by a predetermined separation distance, and thereafter applying ultraviolet radiation to and thereby hardening said adhesive material while said first and second optical disk pieces are maintained at said uniform separation distance.
Claim 3
Dependent Claim
15 words
The method of claim 1 wherein said adhesive material has viscosity of several hundred cps.
Claim 4
Dependent Claim
33 words
The method of claim 1 wherein said pressure applying step comprises allowing some of said adhesive material to spill over edges of said optical disk pieces and become reabsorbed by said cloth material.
Claim 5
Dependent Claim
46 words
The method of claim 1 wherein said cloth material and said optical disk pieces are horizontally disposed, said second optical disk piece being placed on a horizontal top surface and said pressure being applied by a force applied vertically downward on said first optical disk piece.
Claim 6
Dependent Claim
38 words
The method of claim 4 further comprising the step of pulling said cloth material longitudinally after said ultraviolet radiation applying step to remove completed one of said optical memory disks away from where said force is applied thereonto.
References Cited (Backward Citations)
JPS4811588A
Cited
US4191800A
Cited
US4467383A
Cited
US4414650A
Cited
US4390600A
Cited
US4489139A
Cited
US4544443A
Cited
US4610912A
Cited
US4740947A
Cited
US4686543A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-16 | 1993-10-16 | 1994-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-16 | 1997-10-16 | 1998-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-16 | 2001-10-16 | 2002-04-17 | $7700.00 | Window Closed / Lapsed |