H - Electricity – 01 – H
Patent
H - Electricity
01
H
H01H 13/70 (2006.01) H01H 13/84 (2006.01)
Patent
CA 2070797
The present invention relates to a key touch adjusting method and a device thereof which are capable of setting a profile of the displacement of a key top and the depressing force freely and readily. The position of the key top is detected, and a resistive force corresponding to that position is generated and applied to the key top. Hence, the numeral array for the position data and the force data is stored in a memory. To apply hysteresis to a key force profile curve, a RS flip-flop whose output is inverted by the position data is provided to generate different resistive forces in the key top depressing process and the key top returning process. The present invention also discloses a method of comparing an actually obtained profile curve with a predetermined profile curve on a display device by detecting both the position of the key top and the depressing force thereof, a method of achieving hysteresis characteristics by storing a plurality of numeral arrays of the depressing force vs. the displacement in a memory of a control computer beforehand and by changing the numeral array according to the position of the key top, a mechanism for restricting a range in which the key top is displaced, and a method of generating an on/off signal corresponding to the position of the key top without using an electrical contact.
Iwasa Seiichi
Motoyama Hideyuki
Fetherstonhaugh & Co.
Fujitsu Limited
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