Coded data generation or conversion – Bodily actuated code generator – Including keyboard or keypad
Patent
1989-08-31
1991-07-30
Yusko, Donald J.
Coded data generation or conversion
Bodily actuated code generator
Including keyboard or keypad
341 24, H03K 17955
Patent
active
050363212
ABSTRACT:
A solid state touch or control button assembly (10), with no moving button parts and operated by capacitive sensing by monitoring the phase shift of a signal applied to the face of the button, including in a first embodiment (FIGS. 2A & 2B) a auto balancing button and in a second embodiment (FIGS. 3A & 3B) a constant pressure button. If skin or other material comes into contact with the touch surface, the capacitance is changed and sensed, causing the electrical or electronic function controlled by the touch button to be activated (or deactivated, depending on the design, or otherwise altered). LEDs then are activated, providing visual feedback to the button pusher through a light ring (2A) surrounding the button surface (1). False activation of the button by residual impedance and external influences, such as temperature change, cleaner residue build-up and other deposits, are avoided by compensating for them by slowly auto balancing to all such phase shifts, with the rate of auto balance being set to be faster than the rate of change of the steady state phase shift; and, additionally, false activations by noise transients, including those due to EMI, FRI and other environmental fluctuations, are avoided by delaying the activation of the button by an appropriate amount of time, such as, for example, of the order of about one hundred (100 msec.) milliseconds.
REFERENCES:
patent: 4007459 (1977-02-01), Hagelbarger
patent: 4145748 (1979-03-01), Eichelberger et al.
patent: 4237421 (1980-12-01), Waldron
patent: 4305135 (1981-12-01), Dahl et al.
patent: 4543564 (1985-09-01), Audoin et al.
patent: 4728931 (1988-03-01), Linder et al.
patent: 4728932 (1988-03-01), Atherton
patent: 4737768 (1988-04-01), Lewiner et al.
patent: 4772874 (1988-09-01), Hasegawa
J. G. Irwin, Jr., "Dynamically Adjustable Capacitive Key Sensing Method", Jan. 1983, IBM Technical Disclosure Bulletin, p. 4097.
Leach Robert B.
Slabinski Chester J.
Youla Jean
Lau Yuk H.
Otis Elevator Company
Yusko Donald J.
LandOfFree
Capacitive sensing, solid state touch button system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Capacitive sensing, solid state touch button system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Capacitive sensing, solid state touch button system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1544957