| 摘要 |
A tactile layer for use in combination with diaphragm-type switch keyboards to impact a tactile signal to the user upon depression of a key. The tactile layer comprises a sheet of Mylar polyester material having integrally formed deformations therein wherein the deformation is in the form of an annular ring hingedly supporting a dome shaped projection about a generally circular transition line, the transition line being displaced a first predetermined distance from the plane of the sheet which is less than the distance which the top of the dome shaped projection is displaced from the plane of the sheet.
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