Method and device for manufacturing information carriers
AssigneeU.S. Philips Corporation
InventorAndries Mijnheer
Life of this patent
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Abstract
Method of and a device for manufacturing information carriers form a thermoplastic material, where a thin information carrying die is heated by bringing it into contact with a relatively thick, heated surface and is subsequently separated from the heated surface and pneumatically pressed against the thermoplastic material by a layer of air that thermally isolates the die from the heated surface so that the die may rapidly cool.
Claims4
A method of manufacturing information carriers from a thermoplastic material, comprising first bringing a relatively thin die into contact with a relatively thick surface heated to a temperature slightly above the melting temperature of a solid thermoplastic substrate while maintaining said die spaced from said substrate, then maintaining the contact between the heated surface and the die and the spatial separation between the die and the substrate for a time sufficient to permit the die to acquire the temperature of the heated surface, then separating the die from the heated surface with an insulating layer of gas, and finally pressing the die against the thermoplastic substrate immediately thereafter by means of pneumatic pressure derived from said gas.
A device for manufacturing record carriers from a solid thermoplastic material, comprising a relatively thin information carrying die, a relatively thick block positioned in opposed relationship to said die and heated to a temperature slightly higher than the melting temperature of the thermoplastic material, means to position and support said thermoplastic material on a side of the die opposite and spaced from said block, and pressing means for alternately moving the die into a position spaced from said thermoplastic material and abutting the block and for thereafter moving the die to an alternate position spaced from the block and in contacting relationship with said thermoplastic material and for providing an insulting gas layer between the die and the block when the die is in the alternate position.
Dependencies are inferred from the claim text.