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US 4,877,475 AGranted
Method for producing information storage disk
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsMasami Uchida, Seiko Minamide
Life of this patent
Estimating the term…
Abstract
Bonding of a protection sheet on the substrate of the information storing disk is made by revolving the substrate and the protection film with viscous adhesive applied therebetween, to spread it by centrifugal force, and, after slowing down the rotation speed, UV light is irradiated through the protection film to harden the adhesive.
Claims8
A method for making information storage disk, comprising the steps of:
- applying viscose adhesive on a first disk having a center hole, at a part near said center hole,
- placing a second disk having a center hole corresponding to said center hole of said first disk on said first disk, to form an assembled disk, in which a face of said first disk confronts a face of said second disk,
- temporarily mounting said assembled disk on rotating means, temporarily inserting a center boss of said rotating means in both said center holes,
- while releasably holding only said first disk, revolving said assembled disk around an axis of said center boss by said rotating means to spread said viscose adhesive to all parts of said confronting faces, and
- revolving said assembled disk around said axis of said center boss by said rotating means, while hardening said adhesive while maintaining said assembled disk temporarily mounted on said center boss.
2 more elements
Dependencies are inferred from the claim text.