| 摘要 |
PCT No. PCT/GB85/00049 Sec. 371 Date Sep. 26, 1985 Sec. 102(e) Date Sep. 26, 1985 PCT Filed Feb. 4, 1985 PCT Pub. No. WO85/03595 PCT Pub. Date Aug. 15, 1985.A low profile switch or keypad has one or more touch pads (14) formed integrally with and raised from a surrounding membrane or key mat (15) of elastomeric material by a wall (30) of resiliently deformable material of thickness and angle relative to the mat (15) so that the wall (30) can flex under finger pressure on the or each pad (14) without deflecting the surrounding membrane. The underside of each pad (14) is formed with a convex contact pad (29) dimensioned in relation to the pad diameter and travel and the length of wall (30) so that the pad (29) makes surface to surface contact with conductors (12), (13) of an underlying circuit board (10). The mat (15) is held in tension to the board (10) fits. The keyboard uses only two interfitting parts and needs no bezel but provides a tactile response to key depression.
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