# US 4,395,211 A · Method and device for manufacturing a plastic record carrier

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- Number: US 4,395,211 A
- Document ID: US4395211A
- Status: Granted
- Kind: A
- Application number: 06/286,905
- Filed: 1981-07-27
- Granted: 1983-07-26
- Earliest claimed: 1979-08-10
- Assignees: U.S. Philips Corporation
- Inventors: Egbert Broeksema; Arnoldus A. Smeets
- Web page: https://patentgrep.com/patent/US4395211A

## CPC

- B29C 43/021: {characterised by the shape of the surface}
- G11B 3/70: characterised by the selection of material or structure; Processes or apparatus specially adapted for manufacturing record carriers
- B29C 2043/025: {forming a microstructure, i.e. fine patterning}
- B29L 2017/003: {Records or discs}
- Y10S 425/81: Sound record
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R)
- B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A method and device for manufacturing a record carrier is disclosed in which a liquid moulding resin is deposited in a cavity formed in the surface of a mould which also has at least one data track. Thereafter a flexible substrate, having a central projection, is deformed into a convex shape and is pressed against the moulding resin. As the projection on the substrate enters the mating cavity in the mold, the resin is squeezed out of the cavity and rolled out across the mould surface by the substrate which is flattened into a planar form during the pressing step. The moulding resin is then cured and the assembly of the substrate with attached, cured resin layer is removed from the mould.

## Claims

### Claim 1

An apparatus for manufacturing a record carrier having a stratified structure and at least one data track, said apparatus comprising a mold having a surface with a pattern formed therein corresponding to the data track to be provided on the record carrier, means for supporting a planar, flexible substrate opposite said mold for movement towards and away from said surface, said mold having a cavity formed in the center of said surface for receiving a curable, fluid resin, said cavity being configured to mate with a central projection on the substrate so that upon movement of the substrate towards said mold, the projection enters said cavity and squeezes the resin in the cavity onto said surface, means for deforming said substrate into a convex form bulging toward said mold and for changing the configuration of said substrate from said convex to a planar form when said substrate contacts the resin on said surface as said substrate is moved towards said mold by said supporting means to thereby roll out the resin over said surface and means for covering the periphery of said substrate during curing of the resin.

### Claim 2 (depends on 1)

The apparatus according to claim 1 wherein said resin is radiation-curable and including means for exposing said resin with radiation to thereby cure said resin.

### Claim 3 (depends on 1)

The apparatus according to claim 1 wherein said covering means includes a first and second flexible ring extending about said mold, the inner edges of said rings adjacent said mold being connected to each other and the other edges of said rings which are remote from said mold being spaced from each other so that said rings enclose a generally conical space therebetween, first means for rigidly clamping the outer edge of said first ring in a plane lying generally in the plane of said surface, and second means for clamping the outer edge of said second ring in a plane which is generally parallel to and spaced from the plane of said surface, said second means being arranged for movement in a direction normal to said surface between a first position at which said inner edges of said rings are spaced from said surface and a second position at which said inner edges of said rings engage the periphery of said substrate when the latter is disposed on said surface.

### Claim 4 (depends on 1)

The apparatus according to claim 1 including means for rotatably supporting said mold.