Method of manufacturing a key top for a push-button switch
AssigneePolymatech Co., Ltd.
InventorsMasanori Shimizu, Kazuo Kikuchi
Life of this patent
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Abstract
A method of manufacturing a key top for a push-button switch according to the present invention includes forming a hot-melt adhesive layer on a resin key top so as to have a shape corresponding to a display portion for displaying a letter, symbol, or other indicia, and transferring a metallic thin film layer onto the hot-melt adhesive layer. Therefore, the metallic thin film layer is not damaged due to coating of the hot-melt adhesive layer, and positioning of the display portion is unnecessary. Further, when a transfer resin layer is formed on the metallic thin film layer, oxidation of the metallic thin film layer or damages thereto can be prevented.
Claims20
A method of manufacturing a key top for a push-button switch, comprising the steps of:
- forming a hot-melt adhesive layer on a resin key top so as to have a shape corresponding to a display portion for displaying a letter, symbol, or other indicia;
- forming a metallic thin film layer on a releasable sheet material;
- forming a transfer resin layer made by a thermoplastic resin in advance on the metallic thin film layer;
- and
- transferring the metallic thin film layer onto the hot-melt adhesive layer through the transfer resin layer to thereby form a resin key top with a metallic tint,
- wherein the transfer resin layer is disposed between the hot-melt adhesive and the metallic thin film layer.
A key top for a push-button switch, said key top being manufactured by a process comprising the steps of:
- forming a hot-melt adhesive layer on a resin key top so as to have a shape corresponding to a display portion for displaying a letter, symbol, or other indicia;
- forming a metallic thin film layer on a releasable sheet material;
- forming a transfer resin layer made by a thermoplastic resin in advance on the metallic thin film layer;
- and
- transferring the metallic thin film layer onto the hot-melt adhesive layer through the transfer resin layer to thereby form a resin key top with a metallic tint,
- wherein the transfer resin layer is disposed between the hot-melt adhesive and the metallic thin film layer.
Dependencies are inferred from the claim text.