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Key-top-panel-and-keyboard-structure-using-the-panel

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Key-top panel and keyboard structure using the panel

Details

Inventors: Kato, Yoshinobu;
Assignee: Sun Arrow Koeki Company Ltd. (Tokyo, JP)
Primary Examiner: Scott; J. R.
Assistant Examiner:
Attorney, Agent or Firm: Smolowitz; Martin

A key-top panel constructed of an electrically non-conductive, resilient material and formed with closed-loop grooves each of which has a closed-loop cross section, each of the closed-loop grooves being deep in the direction of thickness of the key-top panel and having a land portion surrounded by the groove; key-top portions each constituted by the land portion; concavities which are open at the inner face of the key-top panel and which are in registry in cross section with the key-top portions, respectively; and skirt portions each formed between each of the closed-loop grooves and each of the concavities so that the key-top portion surrounded by each closed-loop groove is bridged to an inner wall portion of the key-top panel through each of the skirt portions. The key-top panel may form part of a keyboard structure which may further comprise movable contact elements respectively positioned within the concavities and each fixedly attached to the aforesaid inner end surface portion of each key-top portion.

DETAILED DESCRIPTION What is claimed is: 1.
A key-top panel constructed of an electrically non-conductive, resilient material and having substantially flat parallel inner and outer faces and a plurality of closed-loop grooves which are open at the outer face of the panel and each of which has a closed-loop cross section, each of the closed-loop grooves being deep in the direction of thickness of the key-top panel and defining a land portion surrounded by the closed-loop groove, comprising a plurality of key-top portions each of which is constituted by said land portion and surrounded by each of said closed-loop grooves throughout the thickness of the key-top portion; a plurality of concavities which are open at the inner face of the key-top panel and which are substantially in registry in cross section with said key-top portions, respectively; and skirt portions each of which is formed between each of the closed-loop grooves and each of the concavities so that the key-top portion surrounded by each of said closed-loop grooves is bridged to an inner wall portion of the key-top panel through each of said skirt portions, each of the skirt portions joining with each of said key-top portions and enabling each of the key-top portions to be elastically deformed a desired distance in the direction of thickness of the key-top panel when the key-top portion is depressed at the outer face thereof inwardly in said direction, each of said skirt portions extending generally in frusto-conical form between each of said key-top portions and each of peripheral portions of the key-top panel which surrounds the key-top portions, respectively, and the depth of each of said closed-loop grooves being larger than the thickness of each of said key-top portions.
2.
A key-top panel as set forth in claim 1, having a substantially flat outer face, said key-top portions respectively having flat outer faces which are substantially flush with the flat outer faces of said peripheral portions of the key-top panel.
3.
A key-top panel as set forth in claim 1 or 2, in which each of said skirt portions extends from the inner end of each of said key-top portions and in which the depth of each of said closed-loop grooves is substantially equal to the sum of the thickness of each of said key-top portions and the height of each of said skirt portions

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