Pushbutton switch key arrangement for keyboards having indicia
AssigneeSharp Kabushiki Kaisha
InventorHiroshi Kawasaki
Life of this patent
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Abstract
Pushbutton switch configurations are provided in which one or a plurality of pushbutton switches are formed with integrated bases, actuating springs and key top structures to facilitate fabrication of arrays of such switches in a substantially unitary matrix or in line configuration. In a preferred embodiment a metal base is etched to form spring and key top frame patterns which are press formed into key top and vertically extending supporting spring structures integral with the base plate in a desired matrix or line configuration. Epoxy or similar resin material can then be integrated with the key top frame to complete each pushbutton switch. Suitable operating indicia are press formed or etched in the key top surfaces and contrasted with resin as desired.
Claims6
A pushbutton switch key structure comprising:
- a flexible unitary metal frame including a key top defining surface, a key top frame of metal strips integral with and dependent from said top surface;
- an annular support shoulder integral with the lowermost end of said key top frame;
- a plurality of actuating leaf spring means integrally affixed at one end to the periphery of said support shoulder and extending downwardly therefrom, and a metal base plate integrally affixed to the lower end of said spring means;
- and
- a solid block of molded resin integrated with said key top frame in a desired push-button key configuration;
- said molded resin block and said key top defining surface being configured to define operating indicia on said pushbutton switch key structure.
Dependencies are inferred from the claim text.