Communications: electrical – Continuously variable indicating – With calibration
Patent
1993-09-28
1996-05-07
Swarthout, Brent A.
Communications: electrical
Continuously variable indicating
With calibration
34087038, 341 20, 341 22, 345168, G08C 1506
Patent
active
055150403
ABSTRACT:
This invention relates to methods of self-calibration for computer display cursor positioning devices imbedded within a computer keyboard key (sometimes referred to herein as a "key-type mouse") or other pointing device. A plurality of Force Sensitive Resistor grids ("FSRs") or other pressure sensitive sensors are used to detect relative pressure applied in various directions to a predetermined key of a computer keyboard. An RC circuit is used to indirectly read the values of the FSRs. A predetermined delay period is associated with each sensor followed by a measurement period. The resistance of the FSR is related to the measurement period taken to reach a given voltage value after the predetermined delay period. A positive or negative offset to the predetermined delay period adjusts the time necessary for the RC circuit to reach a predetermined bias voltage value. By breaking the charging time into a delay period and a measurement period the amount of time that the keyboard controller or microprocessor must spend devoted to watching the voltage across the RC circuit for the moment when it reaches V.sub.CC is reduced, improving the operation of the keyboard.
REFERENCES:
patent: 4680577 (1987-07-01), Straayer et al.
patent: 5124689 (1992-06-01), Franz et al.
patent: 5184120 (1993-02-01), Schultz
patent: 5252971 (1993-10-01), Franz et al.
"System Builder's Design Guide for Home Row's J-Mouse", Home Row, Inc., Document No. 280-002-03, pp. 1-18.
"Force and Position Sensing Resistors", Interlink Electronics, Feb., 1990, Technical Overview, Dr. Yaniger, Stuart, pp. 1-4.
Kim Byung T.
Lee Hyung J.
Hill Andrew
Sejin Electron, Incorporated
Swarthout Brent A.
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