US4892606A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical recording medium having space therein and method of manufacturing the same
Assignee: Canon Inc
•
Filing: 1987-08-24
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Granted: 1990-01-09
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Expires: 2007-08-24
Abstract
Abstract An optical recording medium has a space therein and is prepared such that a pair of substrates are partially adhered by an adhesive obtained by dispersing granular or filler type spacing members therein. At least one of the substrates has an optical recording layer thereon, the recording layer faces inside and a specific gravity of the spacing member falls within a range of 0.9 to 1.3 times that of the adhesive. When applying the adhesive to part of at least one of the substrates, a mixture of the spacing members and an adhesive is stored in a tank and is supplied in a small amount in each application cycle.
Inventors
- 👤 Takeshi Miyazaki
- 👤 Tetsuro Fukui
- 👤 Tsuyoshi Santoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:12
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/253
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
116 words
A method comprising the steps of: forming an optical recording layer on at least one of a pair of substrates; applying an adhesive mixture from a storage tank to part of at least one of the pair of substrates, said adhesive mixture being a dispersion of granular or filler-type spacing members in said adhesive, said spacing members having a specific gravity from 0.9 to 1.3 times that of the adhesive in said tank, the spacing members and the adhesive being mixed to prepare a mixture, said mixture being supplied in a small amount from said tank in each applic cycle; adhering the pair of substrates while an optical recording layer faces inside; and curing the adhesive.
Claim 2
Independent Claim
116 words
A method comprising the steps of: forming an optical recording layer on at least one of a pair of substrates; applying an adhesive mixture from a storage tank to part of at least one of the pair of substrates, said adhesive mixture being a dispersion of granular or filler-type spacing members in said adhesive, said spacing members having a specific gravity from 0.9 to 1.3 times that of the adhesive in said tank, the spacing members and the adhesive being mixed to prepare a mixture, said mixture being supplied in a small amount from said tank in each applic cycle; adhering the pair of substrates while an optical recording layer faces inside; and curing the adhesive.
Claim 3
Dependent Claim
50 words
A method according to claim 1, wherein each of said substrates comprises a disk having a central hole, and the adhesive mixture is applied such that the adhesive mixture is dispensed from a dispenser to the inner and outer peripheral portions of each said substrate while the substrate is rotated.
Claim 4
Dependent Claim
32 words
A method according to claim 1, wherein the adhesive mixture is applied to each said substrate by transferring the adhesive mixture from a roll-like plate or blanket cylinder to each said substrate.
Claim 5
Dependent Claim
19 words
A method according to claim 1, wherein the adhesive mixture is applied to each said substrate by screen printing.
Claim 6
Dependent Claim
39 words
A method according to claim 1, wherein each said substrate comprises a disk having a central hole, and the step of adhering the substrates comprises the step of using a jig for aligning the central holes of the substrates.
Claim 7
Dependent Claim
27 words
A method according to claim 5, wherein the jig comprises a ring-like member having an inner diameter substantially equal to an outer diameter of each said substrate.
Claim 8
Dependent Claim
31 words
A method according to claim 5, wherein the jig comprises a columnar member having an outer diameter substantially equal to an inner diameter of the central hole of each said substrate.
Claim 9
Dependent Claim
32 words
A method according to claim 1, wherein the adhesive comprises an ultraviolet curing type adhesive, and the step of curing the adhesive comprises the step of emitting ultraviolet rays onto the adhesive.
Claim 10
Dependent Claim
34 words
A method according to claim 1, further including the step of relatively moving the substrates in a direction parallel to adhesion surfaces thereof after the substrates are adhered and the adhesive is thereafter cured.
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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) | 1993-01-08 | 1993-07-10 | 1994-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-08 | 1997-07-10 | 1998-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-08 | 2001-07-10 | 2002-01-09 | $7700.00 | Window Closed / Lapsed |