Keypad with long key travel and improved touch feeling

Details Keypad with long key travel and improved touch feeling Keypad with long key travel and improved touch feeling

H - Electricity

01

H

H01H 13/702 (2006.01) H01H 13/84 (2006.01) H01H 13/85 (2006.01)

Patent

CA 2741733

The present invention relates to a keypad comprising at least one push-button switch (13) and a key (15) making it possible to operate the switch (13) along a translational axis (X). It relates to taking account of the geometric dispersions of the keypad, to the lengthening of the travel of the key (15) and to the enhancement of the tactile sensation when the key (15) is pressed to operate the switch (13). The invention finds a particular, but not exclusive, utility in the instrument panel of an aircraft. According to the invention, the keypad comprises a plunger (31), interposed between the key (15) and the switch (13), of which a stiffness along the translational axis (X) increases continuously with an increase in the compression of the plunger (31). Therefore, the slight stiffness at the beginning of compression allows a long travel of the key (15) and the greater stiffness at the end of compression gives a good tactile sensation with an assured contact even when there are off-center pressures on the key (15).

La présente invention concerne un clavier comportant au moins un interrupteur (13) à poussoir et une touche (15) permettant de manuvrer l'interrupteur (13) suivant un axe (X) de translation. Elle se rapporte à la prise en compte des dispersions géométriques du clavier, à l'allongement de la course de la touche (15) et à l'amélioration de la sensation tactile lors de l'appui sur la touche (15) pour manuvrer l'interrupteur (13). L'invention trouve une utilité particulière, mais non exclusive, dans une planche de bord d'un aéronef. Selon l'invention, le clavier comporte un plongeur (31) interposé entre la touche (15) et l'interrupteur (13) dont une raideur suivant l'axe (X) de translation croît continûment avec une augmentation de la compression du plongeur (31). Ainsi, la faible raideur en début de compression permet une longue course de touche (15) et la plus forte raideur en fin de compression donne une bonne sensation tactile avec un contact assuré même lors d'appuis décentrés sur la touche (15).

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