EP0109245A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Radiation sensitive record disc with improved internal structure
Assignee: Toshiba Corp
•
Filing: 1983-11-07
•
Granted: —
•
Expires: 2003-11-07
Abstract
Abstract A radiation-sensitive record disc is disclosed having a first disc and a second disc coaxially positioned adjacent the first disc to reinforce the first disc. A first spacer is positioned between the first and second discs for fixedly connecting the discs together and to form an air space between the discs. A recording layer is formed on one surface of the first or second discs within the air space. A second spacer is radially displaced from the first spacer, and positioned between the first and second discs. This second spacer enables the discs to move relative to each other in a radial direction in response to expansion or contraction of at least one of the discs due to changes in temperature, humidity, atmospheric pressure, etc.
Inventors
- 👤 Kazuhara C/O Patent Division Odawara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 08:10
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/24015
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
133 words
A radiation sensitive record disc comprising: a first disc member (10); a second disc member (17) coaxially positioned adjacent said first disc member to reinforce said first disc member; first spacing means (13) between said first and second disc members for fixedly connecting said disc members together to form an air space (15) between said disc members; recording layer (11) formed on one surface of said first or second disc members in the air space between said disc members'; and second spacing means (18, 19) radially displaced from said first spacing means and between said first and second disc members and so arranged as to enable said disc members to move relative to each other in a radial direction in response to expansion or contraction of at least one of said disc members.
Claim 2
Dependent Claim
133 words
A radiation sensitive record disc comprising: a first disc member (10); a second disc member (17) coaxially positioned adjacent said first disc member to reinforce said first disc member; first spacing means (13) between said first and second disc members for fixedly connecting said disc members together to form an air space (15) between said disc members; recording layer (11) formed on one surface of said first or second disc members in the air space between said disc members'; and second spacing means (18, 19) radially displaced from said first spacing means and between said first and second disc members and so arranged as to enable said disc members to move relative to each other in a radial direction in response to expansion or contraction of at least one of said disc members.
Claim 3
Dependent Claim
106 words
A radiation sensitive record disc according to claim 1 further comprising a third disc member coaxially positioned adjacent said second disc member on a side opposite said first disc member, third spacing means between said second and third disc members for fixedly connecting said second and third disc members together to form a second air space and a recording layer formed on one surface of said second or third disc members in the second air space, said second spacing-means further extending between said second and third disc members for enabling said second and third disc members to move relative to each other in a radial direction.
Claim 4
Dependent Claim
26 words
A radiation sensitive record disc according to claim 1 or claim 2 wherein said second disc member has a thickness greater than said first disc member.
Claim 5
Dependent Claim
42 words
A radiation sensitive record disc according-to claim 2 or claim 3 wherein said first and third spacing means comprise a pair of concentric inner annular spacers bonded between said second disc member and each of said first and third disc members, respectively.
Claim 6
Dependent Claim
29 words
A radiation sensitive record disc according to claim 4 wherein said concentric inner annular spacers comprise projections on the inner periphery of said first and third disc members. ,
Claim 7
Dependent Claim
29 words
A radiation sensitive record disc according to claim 4 wherein said concentric inner annular spacers comprise projections on the inner periphery of both surfaces of said second disc member.
Claim 8
Dependent Claim
50 words
A radiation sensitive record disc according to any of claims 2 to 6 wherein said second spacing means comprises an outer annular spacer bonded between said first and third disc members, said outer annular spacing having a groove facing said second disc member to slidably receive said second disc member.
Claim 9
Dependent Claim
27 words
A radiation sensitive record disc according to claim 7 wherein said outer annular spacer comprises projections on the outer periphery of-said first, and third disc members. ,
Claim 10
Dependent Claim
53 words
A radiation sensitive record disc according to any of claims 2 to 6, wherein said second spacing means comprises a pair of outer annular rings bonded to opposite sides of said second disc member, each of said outer annular rings having a groove to slidably receive said first and third disc members, respectively.
Claim 11
Dependent Claim
38 words
A radiation sensitive record disc according.to any of claims 2 to 6 wherein said-second spacing means comprises outer annular projections on opposite sides of said second disc member which abut against said first and third disc members respectively.
Claim 12
Dependent Claim
50 words
A radiation sensitive record disc according to any of claims 2 to 6 wherein said second spacing means comprises a pair of elastic annular rings placed in grooves on opposite sides of the outer periphery of said second disc member to abpt against said first and third disc members, respectively.
Claim 13
Dependent Claim
68 words
A radiation sensitive record disc according to any of claims 2 to 6 wherein said second spacing means comprises an elastic annular belt supported on the outer peripheral surface of said second disc member and extending between said first and third disc members to slidably engage the inner surfaces of said first and third disc members, and an outer rim fixedly connecting said first and third disc members.
Claim 14
Dependent Claim
37 words
A radiation sensitive record disc according to claim 1 wherein said second disc member has an annular projection on its outer peripheral surface and said second spacing means comprises an outer annular ring slidably engaging said projection.
Claim 15
Dependent Claim
46 words
A radiation sensitive record disc according to claim 13 wherein said second spacing means further comprises an outer elastic ring between said first disc member and one surface of said projection, said outer annular ring slidably engaging a surface of said projection opposite said one surface.
Claim 16
Dependent Claim
41 words
A radiation sensitive record disc according . to claim 1 wherein said second spacing means forms an annular gap outside the outer peripheral surface of said second disc member to permit movement of said second disc member in the radial direction.
Claim 17
Dependent Claim
42 words
A radiaton sensitive record disc according to claim 1 wherein said second spacing means comprises an outer annular spacer bonded to said first disc member and having a first groove facing said second disc member to slidably receive said second disc member.
Claim 18
Dependent Claim
44 words
A radiation sensitive record disc according to claim 16 wherein said second spacing means further comprises a second groove in the outer peripheral surface of said second disc member for slidably receiving a portion of said outer annular spacer to form an interlocking configuration.
Claim 19
Dependent Claim
88 words
A radiation sensitive record disc according to claim 17 wherein said outer annular spacer comprises first and second interlocking elements, said first interlocking element being bonded to said first disc member and said second interlocking element being an annular elastic binder supported by said first interlocking element to form said first groove, said annular elastic binder further extending into said second groove to elastically bind said second disc member to said first interlocking element to enable said second disc member to slide relative to said first interlocking element.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.