The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 23, 1999
Filed:
Nov. 10, 1997
Tsuyoshi Nakamura, Tokyo, JP;
Plymatech Co., Ltd., Tokyo, JP;
Abstract
A sheet type key top of a push button switch which is disposed over a switch contact used for the input portion of a portable electric appliance or a machine control portion or the like, and through which the underlying switch is depressed to turn it on or off. A film on key tops is formed with a multi layered elastic film (4), and a display portion printed layer (3) is completely covered with the protective layer (4). Then, thermoplastic fine powder (5) capable of heat fusing is added to the display portion print layer (3) and/or to the protective layer (4), thereby the film and the display portion are integrally united by heat fusing a thermoplastic substance constituting key tops and the thermoplastic fine powder through heat generated during molding process. Further, stress intercepting zones of concave or convex shapes are disposed at distances between adjacent keys to prevent error activation. Thereby the free design of the key top profile can be secured, the variety of the key top design can be attained, and further in the case of the case design of three dimensional configuration, the various design thereof can be also realized.