Switching device and portable terminal device

Abstract

A switching device is provided in which a substrate on which switch components are arranged, a resilient sheet arranged on this substrate and a button arranged on the resilient sheet are stored in a predetermined case such that the surface of the button is exposed, and the switch components are operated by being pressed by the button; on the periphery of the button are provided a plurality of columnar projections whose ends are approximately spherical (or tapered depressions) in the direction approximately at right angles to an upper surface pressing the button, and on the surface of the case in contact with the button are provided a plurality of tapered depressions (or columnar projections whose ends are approximately spherical) which engage with the columnar projections (or tapered depressions) of the button. Accordingly, the switching device which can be easily assembled is obtained, including an operational button which returns to a predetermined position in a hole with the release after pushed down.

Dependencies are inferred from the claim text.