Coded data generation or conversion – Bodily actuated code generator – Including keyboard or keypad
Patent
1994-09-15
1995-07-18
Peng, John K.
Coded data generation or conversion
Bodily actuated code generator
Including keyboard or keypad
400481, H03K 1794, B41J 508
Patent
active
054345669
ABSTRACT:
A key touch adjusting device wherein the position of a key top is detected, and a resistive force corresponding to that position is generated and applied to the key top. 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. Also disclosed are 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.
REFERENCES:
patent: 4343557 (1982-08-01), DuRoss et al.
patent: 4977298 (1990-12-01), Fujiyama
patent: 5220318 (1993-06-01), Staley
Patent Abstracts of Japan, vol. 13, No. 578 (E-864)(3926) Dec. 20, 1989 for Japanese Application No. 12 43 325, Sep. 28, 1989.
European Search Report, The Hague, Apr. 21, 1993.
Iwasa Seiichi
Motoyama Hideyuki
Fujitsu Limited
Mullen Jr. Thomas J.
Peng John K.
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