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US4607264A
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Recording medium of deformable air-sandwich structure
Assignee: Fujifilm Holdings Corp
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Filing: 1985-08-19
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Granted: 1986-08-19
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Expires: 2005-08-19
Abstract
Abstract A recording medium having an air-sandwich structure comprising two disc-shaped substrates opposed to each other at a given distance by interposing therebetween a ring-shaped inner spacer and a ring-shaped outer spacer and a recording layer for writing and/or reading information with laser beam which is provided on the inner surface of at least one substrate, characterized in that the distance between said two substrates satisfies the following expression (I): <IMAGE> (I) wherein h is the distance in mm between two substrates, E1 and E2 are each a Young's modulus (in kg/mm2) of each substrate, l is the distance (in mm) between the inner spacer and the outer spacer, and t1 and t2 are each the thickness (in mm) of each substrate.
Inventors
- 👤 Yoshio Tani
- 👤 Kyoichi Naruo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:45
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/24015
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
125 words
A recording medium having an air-sandwich structure comprising two disc-shaped substrates opposed to each other at a given distance by interposing therebetween a ring-shaped inner spacer and a ring-shaped outer spacer and a recording layer for writing and/or reading information with laser beam which is provided on the inner surface of at least one substrate, characterized in that the distance between said two substrates satisfies the following expression (I): ##EQU10## wherein h is the distance in mm between two substrates, E 1 and E 2 are each a Young's modulus in kg/mm 2 of each substrate, l is the distance in mm between the inner spacer and the outer spacer, and t 1 and t 2 are each the thickness in mm of each substrate.
Claim 2
Dependent Claim
125 words
A recording medium having an air-sandwich structure comprising two disc-shaped substrates opposed to each other at a given distance by interposing therebetween a ring-shaped inner spacer and a ring-shaped outer spacer and a recording layer for writing and/or reading information with laser beam which is provided on the inner surface of at least one substrate, characterized in that the distance between said two substrates satisfies the following expression (I): ##EQU10## wherein h is the distance in mm between two substrates, E 1 and E 2 are each a Young's modulus in kg/mm 2 of each substrate, l is the distance in mm between the inner spacer and the outer spacer, and t 1 and t 2 are each the thickness in mm of each substrate.
Claim 3
Dependent Claim
76 words
The recording medium as claimed in claim 1, wherein said distance h between the substrates satisfies the following expression (II): ##EQU11## wherein h is the distance in mm between two substrates E 1 and E 2 are each a Young's modulus in kg/mm 2 of each substrate, l is the distance in mm between the inner spacer and the outer spacer, and t 1 and t 2 are each the thickness in mm of each substrate.
Claim 4
Dependent Claim
81 words
The recording medium as claimed in claim 2, wherein said two substrates are made of the same material and has the same thickness, and said distance h between the substrates satisfies the following expression (II'): ##EQU12## wherein h is the distance in mm between two substrates, E is a Young's modulus in kg/mm 2 of the substrate, l is the distance in mm between the inner spacer and the outer spacer and t is the thickness in mm of the substrate.
Claim 5
Dependent Claim
23 words
The recording medium as claimed in claim 2 or 3, wherein said distance h between the substrates satisfies the condition of 0.5≦h≦2.0 mm.
Claim 6
Dependent Claim
32 words
The recording medium as claimed in claim 2, wherein said thickness t 1 and t 2 of the substrates satisfy the conditions of 1.0≦t 1 ≦2.0 mm and 1.0≦t 2 ≦2.0 mm.
Claim 7
Dependent Claim
21 words
The recording medium as claimed in claim 3, wherein said thickness t of the substrate satisfies the condition of 1.0≦t≦2.0 mm.
Claim 8
Dependent Claim
28 words
The recording medium as claimed in claim 2 or 3, wherein said distance l between the inner spacer and the outer spacer satisfies the condition of 50≦l≦100 mm.
Claim 9
Dependent Claim
35 words
The recording medium as claimed in claim 2 or 3, wherein each of said two substrates is made of a material selected from the group consisting of glass, an acrylic resin and a polycarbonate resin.
Claim 10
Dependent Claim
19 words
The recording medium as claimed in claim 8, wherein both of said two substrates are made of tempered glass.
Claim 11
Dependent Claim
76 words
The recording medium as claimed in claim 1, wherein said distance h between the substrates satisfies the following expression (III): ##EQU13## wherein h is the distance in mm between two substrates, E 1 and E 2 are each a Young's modulus in kg/mm 2 of each substrate, l is the distance in mm between the inner spacer and the outer spacer, and t 1 and t 2 are each the thickness in mm of each substrate.
Claim 12
Dependent Claim
81 words
The recording medium as claimed in claim 10, wherein said two substrates are made of the same material and has the same thickness, and said distance h between the substrates satisfies the following expression (III'): ##EQU14## wherein h is the distance in mm between two substrates, E is a Young's modulus in kg/mm 2 of the substrate, l is the distance in mm between the inner spacer and the outer spacer and t is the thickness in mm of the substrate.
Claim 13
Dependent Claim
23 words
The recording medium as claimed in claim 10 or 11, wherein said distance h between the substrates satisfies the condition of 0.2≦h≦2.0 mm.
Claim 14
Dependent Claim
32 words
The recording medium as claimed in claim 10, wherein said thickness t 1 and t 2 of the substrates satisfy the conditions of 1.0≦t 1 ≦2.0 mm and 1.0≦t 2 ≦2.0 mm.
Claim 15
Dependent Claim
21 words
The recording medium as claimed in claim 11, wherein said thickness t of the substrate satisfies the condition of 1.0≦t≦2.0 mm.
Claim 16
Dependent Claim
28 words
The recording medium as claimed in claim 10 or 11, wherein said distance l between the inner spacer and the outer spacer satisfies the condition of 20≦l≦100 mm.
Claim 17
Dependent Claim
38 words
The recording medium as claimed in claim 10 or 11, wherein each of said two substrates is made of a material selected from the group consisting of glass, an acrylic resin, a polycarbonate resin and an epoxy resin.
Claim 18
Dependent Claim
24 words
The recording medium as claimed in claim 16, wherein both of said two substrates are made of an acrylic resin or a polycarbonate resin.
References Cited (Backward Citations)
US4449138A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-18 | 1990-02-17 | 1990-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-18 | 1994-02-17 | 1994-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-18 | 1998-02-17 | 1998-08-19 | $7700.00 | Window Closed / Lapsed |