Patent EP0032005A1 successfully refreshed from Google Patents.
EP0032005A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Improvements in or relating to disc record preparation
Assignee: EMI Ltd
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Filing: 1980-12-09
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Granted: —
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Expires: 2000-12-09
Abstract
Abstract A method for manufacturing modulated disc records (i.e. video or audio records) including bonding a plastics material foil (14,15) to the unmodulated face of a stamper plate (12,13) before the stamper plate is secured between the rams (R) of the record press.
Inventors
- 👤 Samuel James Blair Johnston
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 06:57
CPC Classifications
B; B30; B30B; B30B15/00; B30B15/06; B29; B29C; B29C43/00; B29C43/02; B29L; B29L2017/00; B29L2017/001; B29L2017/003; Y; Y10; Y10S; Y10S425/00; Y10S425/81
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
103 words
A method of manufacturing a modulated disc record comprising the steps of:- providing a stamper plate (12, 13) bearing modulations at one surface only representing a negative impression of the information or data to be recorded, securing the stamper plate between the rams (R) of a press and then moulding a thermoplastics material, interposed between the rams, so as to impart thereto a positive impression of said data or information, the method being characterised in that before the stamper plate is so secured a plastics material foil (14, 15) is disposed between the unmodulated surface of the stamper plate and the ram. -
Claim 2
Independent Claim
103 words
A method of manufacturing a modulated disc record comprising the steps of:- providing a stamper plate (12, 13) bearing modulations at one surface only representing a negative impression of the information or data to be recorded, securing the stamper plate between the rams (R) of a press and then moulding a thermoplastics material, interposed between the rams, so as to impart thereto a positive impression of said data or information, the method being characterised in that before the stamper plate is so secured a plastics material foil (14, 15) is disposed between the unmodulated surface of the stamper plate and the ram. -
Claim 3
Dependent Claim
35 words
A method according to Claim 1 wherein the foil is bonded to the unmodulated surface of the stamper plate or to the surface of a mould block interposed between the ram and the stamper plate.
Claim 4
Independent Claim
25 words
A method according to Claims 1 or 2 wherein the foil has a metalised film at the surface thereof lying closest to the stamper plate.
Claim 5
Independent Claim
20 words
A method according to Claims 1 to 3 wherein the foil has a thickness in the range 0.025mm to 0.125mm.
Claim 6
Dependent Claim
18 words
A method according to Claim 4 wherein the foil has a thickness in thr range 0.050mm to 0.100mm.
Claim 7
Dependent Claim
20 words
_ A method according to Claims 1 to 5 wherein the foil is made of a polyester or polycarbonate material.
Claim 8
Dependent Claim
16 words
A disc record produced by a method according to any one of Claims 1 to 6.
References Cited (Backward Citations)
No citation records indexed.
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