In a system employing a plurality of touch sensitive screens which generate analog signals representing the coordinates of a position touched, a selection means is provided to select the screens rapidly in sequence with the analog output signals from the selected screen being fed to analog-to-digital converters. The sequence of selection proceeds rapidly from screen to screen until it is detected that a screen has been touched whereupon the selection sequencing pauses to permit the analog-to-dig...

The apparatus comprises a wire sheet graphics tablet and a display apparatus, particularly a cathode ray tube, for receiving the signals transmitted by the graphics tablet. Alternating current flows through wires (5,6) of the tablet. The non-conducting plate (4) of the tablet is transparent and the wire sheets (5,6) are made up of transparent electrical conductors or of small conducting wires, which makes them practically invisible. The tablet is placed on the screen of the display apparatus. Be...

A touch tablet (10) for determination of x-axis and y-axis coordinates of point touched includes a two-layer operating structure, each layer (11,21) containing a resistive bar (12,22) at an edge portion of an insulative substrate and a series of interdigitated conductive pathways (14,15) extending toward and away from the bar and an opposed conductive strip (13,33,43) on at least one of the layers. The bars and conductive pathways are orthogonally with respect to one another on each layer and fu...

A coordinate input device with display comprises a tablet having a plurality of X-direction magnetostrictive transmission mediums arranged in parallel, a plurality of Y-direction magnetostrictive transmission mediums arranged in parallel and superposed on the X-direction transmission mediums substantially orthogonally thereto, and first and second coils arranged over substantial regions of the magnetostrictive transmission mediums. A magnetic pen is used to produce just enough magnetism for caus...

This invention is an input device that enables the user to take symbol sequences such as whole words, phrases, sentences, paragraphs, or other multi-symbol sequences from a computer's memory and have these symbol sequences printed out or displayed by some other means such as a computer monitor. This invention uses a grid of points of switch closure, where each point is identified by an alphanumeric or other code; and where each point of switch closure can be individually activated by the user. P...

A cathode ray tube display device has conductive plates mounted adjacent the four sides of the CRT faceplate. These plates are positioned to sense electromagnetic noise radiation generated by the CRT. The plates are coupled to differential circuits so that normally the noise signals generated in the plates cancel. However when a finger or other object is placed at or near the CRT faceplate, the noise radiation field is disturbed, and the changed signals generated in the plates are sensed by the ...

In the inventive touch-operated see-through coordinate input unit, the contacting wires embedded in the upper and lower substrate sheets in a relative perpendicular disposition are divided into groups each of at least two of the adjacent wires and the wires belonging to the same group are bonded to the same electrode. When the upper sheet is depressed with a finger tip or stylus point at a crossing point of the wires on the upper and lower sheets, electrical contact can be obtained at two points...

Apparatus and methods for creating a virtual push button comprise a touch sensitive orthogonal data field input device useably connected within a computing system in which a touch action at the device generates a stream of data related to the location within the field of the touch action. The orthogonal data field input device includes circuitry for sensing the onset of a first touch action and for monitoring the continuity thereof; and the computing system including a second condition sensor fo...

A touch sensing display apparatus having improved electrical signal processing is described. A plurality of signal threshold comparison levels are employed by the electronic signal calculating and processing unit to identify actual touch signals and to exclude extraneous vibration and offset signal components. Static thresholds of comparison are utilized at lower signal levels and a dynamic, signal tracking threshold is utilized at higher signal levels. The apparatus is particularly effective fo...

A touch panel has panel scanning signals selectively applied to the four sides of a touch sensing surface of the panel so as to establish alternating current voltage gradients in desired directions across the touch sensing surface. When the panel is touched, touch signals or currents result and are utilized by a touch location circuit in determining the location of touch. The impedance touch current resulting from a user's touch may also be determined and used. The touch panel circuit automatica...