Patent EP0145200A1 successfully refreshed from Google Patents.
EP0145200A1
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EP
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Double-sided stretched surface recording disk
Assignee: 3M Co
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Filing: 1984-10-25
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Granted: —
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Expires: 2004-10-25
Abstract
Abstract A double-sided stretched surface recording disk (10) includes a circular, planar main body (24) at the periphery ot which are located two reference surfaces (20, 22). Iron-oxide coated polymer films (14, 16) are stretched across the reference surfaces (20, 22) on each side of the main body (24) and bonded to each other at an edge (30). In a second embodiment, the disk main body (72) is annular rather than circular and further includes reference surfaces and a sharp edge located at the inner edge of the disk body (72) which are the mirror image of the structure located at the periphery of the recording disk. In this embodiment films (74, 76) are attached to each other at the outer and inner diameters of the annular main body (72).
Inventors
- 👤 Lynn R. c/o Minnesota Mining and Skow
- 👤 John W. c/o Minnesota Mining and Louks
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 11:45
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/74; G11B5/82; G11B5/825; G11B23/00; G11B23/0014; G11B23/0021; G11B25/00; G11B25/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
141 words
A stretched surface recording (10) disk comprising: a disk-shaped support (12) including a generally circular planar main body (24) having an axis perpendicular to the plane of said main body (24), at least one annular reference surface (20) adjacent the periphery of said main body (24), said reference surface (20) being axially spaced from the plane of said main body (24) and defining the furthermost extent of said support (12) in said axial direction from said main body (24), and an annular, relatively sharp peripheral edge (30) defining the furthermost radial extent of said support (12); and two films (14, 16), one (14) of which is stretched across said annular reference surface (20), and the other being positioned on the opposite axial side of said main body (24), said films (14, 16) being bonded to each other at said edge (30).
Claim 2
Dependent Claim
141 words
A stretched surface recording (10) disk comprising: a disk-shaped support (12) including a generally circular planar main body (24) having an axis perpendicular to the plane of said main body (24), at least one annular reference surface (20) adjacent the periphery of said main body (24), said reference surface (20) being axially spaced from the plane of said main body (24) and defining the furthermost extent of said support (12) in said axial direction from said main body (24), and an annular, relatively sharp peripheral edge (30) defining the furthermost radial extent of said support (12); and two films (14, 16), one (14) of which is stretched across said annular reference surface (20), and the other being positioned on the opposite axial side of said main body (24), said films (14, 16) being bonded to each other at said edge (30).
Claim 3
Dependent Claim
141 words
A stretched surface recording disk (10) according to claim 1 wherein said support (12) is formed of uniform thickness material and includes a first annular extension extending radially outwardly and axially from said main body and a second annular extension extending radially outwardly from said first extension and axially opposite said first extension to terminate in an end surface (26) generally perpendicular to said second extension and producing radially inward (20) and outward (30) corners with the major surfaces of said second extension; the junction of said first and second extensions defining said at least one reference surface (22), said inward corner defining another reference surface (20), and said outward corner (30) being said sharp edge (30) which defines the furthermost radial extent of said support (12) and that edge (30) where said films (14, 16) are bonded to each other.
Claim 4
Dependent Claim
33 words
A stretched surface recording disk (10) according to claim 2 wherein said outward edge (30) has an included angle between said end surface (26) and said one major surface of approximately 55 degrees.
Claim 5
Dependent Claim
31 words
A stretched surface recording disk (10) according to claim 2 wherein each of said extensions are oriented at approximately 45 degrees with respect to the plane of said main body (24).
Claim 6
Dependent Claim
95 words
A stretched surface recording disk (32) according to claim 1 wherein said support (34) includes a rim (36) triangular in cross-section which is attached to said main body (24) at a point approximately midway along the base of said triangular cross-section (36) and wherein said base angles of said triangular cross-sectional rim are axially spaced reference surfaces (38, 40) and the apex (46) of said triangular cross-sectional rim (36) is said sharp edge (46) defining the furthermost radial extent of said support (34) and at which said films (14, 16) are bonded to each other.
Claim 7
Dependent Claim
27 words
A stretched surface recording disk (32) according to claim 5 wherein said apex (46) of said triangular cross-section (36) produces an included angle of approximately 55 degrees.
References Cited (Backward Citations)
FR2372488A1
Cited
EP0092325A1
Cited
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