Key sheets and method of producing the same
AssigneePolymatech Co., Ltd.
InventorsTakeshi Nishimura, Kengo Nishi, Masaya Katori
Life of this patent
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Abstract
A key sheet includes a base sheet and a plurality of key tops arranged on the base sheet and exposed from an operation opening formed in a case of a device. The operation opening has no partition bridge. The base sheet includes a plurality of bases for fixing the key tops and a reinforcing member for supporting the bases while allowing displacement upon pushing.
Claims20
A key sheet comprising:
- a base sheet;
- and
- a plurality of key tops arranged on the base sheet and exposed from an operation opening formed in a case of a device, the operation opening having no partition bridge,
- wherein the base sheet includes:
- a plurality of bases for fixing the key tops on the base sheet;
- and
- a resin film having through holes to fix the bases thereon by bridging over the bases.
A key sheet comprising:
- a base sheet;
- and
- a plurality of key tops arranged on the base sheet and exposed from an operation opening formed in a case of a device, the operation opening having no partition bridge,
- wherein the base sheet includes:
- a plurality of bases made of a rubber-like elastic body for fixing the key tops;
- and
- a thin-plate like reinforcing member made of a hard resin for supporting the bases while allowing displacement upon pushing.
A method of manufacturing a key sheet in which a plurality of key tops are exposed from an operation opening having no partition bridge formed in a case of a device and are fixed on a base sheet, comprising the steps of:
- preparing a reinforcing member using a heat-resistant hard resin having a deflection temperature under load of 170° C. or more measured on the basis of Japan Industrial Standard JIS K 7191;
- transferring the reinforcing member to a cavity of a die for molding the base sheet;
- and
- producing the base sheet by charging a rubber-like elastic body into the cavity and integrally combining the rubber-like elastic body and the reinforcing member at temperatures lower than the deflection temperature under load of the heat-resistant hard resin.
Dependencies are inferred from the claim text.