| 摘要 |
A panel keyboard comprising a switch sheet (17) having a pattern of contacts (14) spaced by insulating spacers (11) from a base portion (10) also having a pattern of contacts (12). The corresponding contact pairs (14,12) are engageable with each other upon application of pressure to the switch sheet (17) or base portion (10). The thickness of the portions of the switch sheet (17) attached to respective contact pairs (12,14) differs from portion to portion providing a variation in actuation pressure between one contact pair A and the next contact pair B. Alternatively such a variation may be provided by differing thicknesses in the base portion (10). <IMAGE> |
