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US 5,825,352 AGranted
Multiple fingers contact sensing method for emulating mouse buttons and mouse operations on a touch sensor pad
AssigneeLogitech, Inc.
InventorsStephen J. Bisset, Bernard Kasser
Life of this patent
Estimating the term…
Abstract
Method and apparatus for detecting an operative coupling between one or more fingers or other appropriate objects and a touch pad includes processes for detection of multiple maxima with intermediate minima in appropriate sequences to emulate the operations of cursor control and button actuations in a pointing and control device.
Claims31
A method for detecting the operative coupling of multiple fingers to a touch sensor involving the steps of
- scanning the touch sensor to (a) identify a first maxima in a signal corresponding to a first finger, (b) identify a minima following the first maxima, (c) identify a second maxima in a signal corresponding to a second finger following said minima, and
- providing an indication of the simultaneous presence of two fingers in response to identification of said first and second maxima.
A touch sensor for detecting the operative coupling of multiple fingers comprising:
- means for scanning the touch sensor to (a) identify a first maxima in a signal corresponding to a first finger, (b) identify a minima following the first maxima, and (c) identify a second maxima in a signal corresponding to a second finger following said minima, and
- means for providing an indication of the simultaneous presence of two fingers in response to identification of said first and second maxima.
Dependencies are inferred from the claim text.