US4331966A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Information storage device and method of forming same
Assignee: Storage Technology Corp
•
Filing: 1980-10-06
•
Granted: 1982-05-25
•
Expires: 2000-10-06
Abstract
Abstract An information storage device for recording by means of a radiant energy beam such as a laser in which a disc-shaped base member, one or more regions of recording medium and one or more disc-shaped protective layers (or "windows") are arranged to form a layered structure or sandwich. The innermost portions of the protective layer(s) are fastened to the corresponding portions of the base member and an annular support ring radially spaced from the outermost edge of the base member is fastened to the outer edge of the protective layer(s). A circumferential gap is thereby provided between the annular support and base member to permit expansion and contraction of the base member.
Inventors
- 👤 Erik Moe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:57
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/26
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
180 words
An information storage device comprising: a disc-shaped base member; at least one disc-shaped protective member overlying said base member; a radiant-energy-responsive recording medium disposed between said base member and said protective member within an annular information storage region, said storage region having an inner radius greater than an inner radius of said protective member and an outer radius less than an outer radius of said protective member; an annular support member having an inner radius greater than an outer radius of said base member, but less than said outer radius of said protective member; means for fastening the outer radius portion of said protective member to said annular support member; and means for fastening said protective member to said base member radially inwardly from said storage region; whereby said information storage region is enclosed by the the combination of said base member, said protective member, said support member and said fastening means and a circumferential gap is provided between said annular support member and said base member for permitting relative radial movement between said base member and said protective member.
Claim 2
Dependent Claim
180 words
An information storage device comprising: a disc-shaped base member; at least one disc-shaped protective member overlying said base member; a radiant-energy-responsive recording medium disposed between said base member and said protective member within an annular information storage region, said storage region having an inner radius greater than an inner radius of said protective member and an outer radius less than an outer radius of said protective member; an annular support member having an inner radius greater than an outer radius of said base member, but less than said outer radius of said protective member; means for fastening the outer radius portion of said protective member to said annular support member; and means for fastening said protective member to said base member radially inwardly from said storage region; whereby said information storage region is enclosed by the the combination of said base member, said protective member, said support member and said fastening means and a circumferential gap is provided between said annular support member and said base member for permitting relative radial movement between said base member and said protective member.
Claim 3
Dependent Claim
21 words
An information storage device according to claim 1 wherein: said annular support member and said base member have substantially equal thickness.
Claim 4
Dependent Claim
34 words
An information storage device according to claim 2 wherein: said annular support member and said base member have respective upper surfaces lying in a first plane and lower surfaces lying in a second plane.
Claim 5
Dependent Claim
52 words
An information storage device according to claim 3 wherein said one disc-shaped protective member overlies said upper surface of said base member and said device further comprises a second disc-shaped protective member overlying said lower surface of said base member, fastened thereto and fastened to said lower surface of said support member.
Claim 6
Dependent Claim
41 words
An information storage device according to claim 4 wherein said recording medium is disposed with respect to said base member to provide a first information storage layer adjacent said upper surface and a second information storage layer adjacent said lower surface.
Claim 7
Dependent Claim
36 words
An information storage device according to claim 5 wherein: said base member comprises recessed regions associated with each of said upper and lower surfaces and said recording medium is disposed within each of said recessed regions.
Claim 8
Dependent Claim
49 words
An information storage device according to claim 1 wherein: said base member and said protective member are formed of materials having different thermal coefficients of expansion and said circumferential gap is dimensioned to permit relative radial movement between said base and protective members over an intended operating temperature range.
Claim 9
Dependent Claim
20 words
An information storage device according to claim 7 wherein: said base member is aluminum and said protective member is glass.
Claim 10
Dependent Claim
22 words
An information storage device according to claim 7 wherein: said support member and said base member are formed of the same material.
Claim 11
Dependent Claim
84 words
In a method of forming an information storage device in which a recording medium is deposited on a disc-shaped base member and an overlying disc-shaped protective member is fastened to said base member at an inner radial portion thereof, the improvement which comprises forming an annular support member having an inner radius greater than the outer radius of said base member to form a circumferential gap between said annular support member and said base member and fastening said protective member to said support member.
Claim 12
Dependent Claim
84 words
In a method of forming an information storage device in which a recording medium is deposited on a disc-shaped base member and an overlying disc-shaped protective member is fastened to said base member at an inner radial portion thereof, the improvement which comprises forming an annular support member having an inner radius greater than the outer radius of said base member to form a circumferential gap between said annular support member and said base member and fastening said protective member to said support member.
Claim 13
Dependent Claim
30 words
The method of forming an information storage device according to claim 10 wherein said annular support member is formed by separating an outermost annular portion from said disc-shaped base member.
Claim 14
Dependent Claim
41 words
The method of forming an information storage device according to claim 11 and further comprising the step of fastening a second disc-shaped protective member to said base member and said support member on surfaces thereof opposite said overlying disc-shaped protective member.
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) | 1985-05-24 | 1985-11-23 | 1986-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-24 | 1989-11-23 | 1990-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-24 | 1993-11-23 | 1994-05-25 | $7700.00 | Window Closed / Lapsed |