Keyboard using pressurized fluid to generate key stroke characte

Details Keyboard using pressurized fluid to generate key stroke characte Keyboard using pressurized fluid to generate key stroke characte

1996-12-19

1998-04-21

Hofsass, Jeffery

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

200 5R, 341 34, 345168, H03K 1794, H03M 1100

Patent

active

057422427

ABSTRACT:
A notebook computer is provided with a collapsible keyboard structure in which, during operation of the computer, the keys are held in extended operating positions by the force of a pressurized fluid-filled flexible mat member having spaced apart orificed compartments against which bottom ends of vertically movable plunger portions of the keys downwardly bear. Position sensors monitor the stroke positions of the keys and, as the keys are depressed during computer use, responsively transmit corresponding position signals to a control system which utilizes the position signals to alter the fluid pressure within the mat member in a manner providing the keys with predetermined, selectively variable stroke force/distance characteristics. When the computer is turned off, fluid pressure within the mat member is relieved in a manner permitting the keys to collapse to retracted storage/transport orientations, thereby reducing the overall thickness of the keyboard until subsequent operation of the computer.

REFERENCES:
patent: 3603983 (1971-09-01), Mitchell
patent: 4109118 (1978-08-01), Kley
patent: 4795888 (1989-01-01), MacFarlane
patent: 5459461 (1995-10-01), Crowley et al.
patent: 5595449 (1997-01-01), Vitkin
patent: 5648771 (1997-07-01), Halgren et al.

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