Abstract:
The cost and complexity of an electronic pressure sensitive transducer are decreased by constructing such a transducer directly on a printed circuit board containing support electronics. Conductive traces are formed on the printed circuit board to define a contact area. A flexible substrate having an inner surface is positioned over the contact area. An adhesive spacer, substantially surrounding the contact area, attaches the flexible substrate to the printed circuit board. At least one resistive layer is deposited on the flexible substrate inner surface. In use, the resistive layer contacts at least two conductive traces in response to pressure applied to the flexible substrate to produce an electrical signal indicative of applied pressure.
Abstract:
The cost and complexity of an electronic pressure sensitive transducer (20) are decreased by constructing such a transducer directly on a printed circuit board (22) containing support electronics. Conductive traces (24) are formed on the printed circuit board (22) to define a contact area (26). A flexible substrate (28) having an inner surface is positioned over the contact area (26). An adhesive spacer (34), substantially surrounding the contact area (26), attaches the flexible substrate to the printed circuit board (22). At least one resistive layer (32) is deposited on the flexible substrate (28) inner surface. In use, the resistive layer (32) contacts at least two conductive traces (24) in response to pressure applied to the flexible substrate to produce an electrical signal indicative of applied pressure.
Abstract:
A method for implementing a control function via a sensor having a touch sensitive control input surface. The method includes detecting a contact with the touch sensitive control input surface, deterpiining a pressure value corresponding to the contact, and initiating a control function from a set of possible control functions based at least in part on the pressure value.
Abstract:
A touchpad includes a first substrate and a second substrate, at least one of which is flexible. A resistor on the first substrate has a narrow shape dividing the first substrate into two regions. A set of conductors in electrical contact with the resistor extend from the resistor into the two regions. A second resistor and at least one second substrate conductor in electrical contact with the second resistor are on the second substrate. This construction allows the touchpad to have an outer shape is not restricted by the need for rectangular coordinates.
Abstract:
A pointing device may be directly soldered to a printed circuit board. In one embodiment, a bottom substrate defines a sensing region with a plurality of interdigitated conductive trace regions. Each trace region includes interdigitated common and sense traces. At least one via passes through the bottom substrate for each trace. Each via supports a conductive path from one trace to at least one lead element. Each lead element is solderable to a printed circuit board. A flexible substrate is constructed from a heat resistant polymer. The flexible substrate has a resistive layer deposited on a bottom side. A raised pedestal is formed on the bottom substrate top face around at least a portion of the sensing region. The pedestal separates the interdigitated conductive traces from the flexible substrate resistive layer. A button on a keypad membrane may be used to depress the flexible substrate onto the trace region.
Abstract:
The present invention determines angular position using a potentiometric touch sensor (100). The sensor (100) has an annular pattern of resistive material (104) on a bottom substrate (102) top surface. Conductive drive lines radially traverse the resistive material (104) so as to make electrical connection with the resistive material (104). A top substrate (108) is spaced above the top surface of the bottom substrate (102). A conductive sense layer (110) on a bottom surface of the top substrate (108) is positioned above the resistive material (104). Pressure applied to either the top substrate (108) or the bottom substrate (102), such as by the touch of a user, causes a portion of the conductive sense layer (110) to contact a corresponding portion of the annular pattern of resistive material (104). The angular position of the applied pressure can be determined by measuring at least one electrical parameter between at least one of the conductive drive lines and the conductive sense layer (110).
Abstract:
A touchpad includes a first substrate and a second substrate, at least one of which is flexible. A resistor on the first substrate has a narrow shape dividing the first substrate into two regions. A set of conductors in electrical contact with the resistor extend from the resistor into the two regions. A second resistor and at least one second substrate conductor in electrical contact with the second resistor are on the second substrate. This construction allows the touchpad to have an outer shape is not restricted by the need for rectangular coordinates.
Abstract:
An apparatus and method for using a scroll sensor providing a touch sensitive control input surface for a plurality of control functions is provided. The input surface is divided into a plurality of regions. Each region is assigned to one of the plurality of control functions. At least one of these control functions accepts parametric control input. A first touch is received at one of the regions on the input surface. The control function assigned to the touched region is selected. If the selected control function is one of the control functions accepting parametric control input, a second touch on the input surface is received as parametric control input during an activation period for the selected control function. The second touch may be received as parametric control input at any point of the input surface.
Abstract:
A force sensing resistor (FSR) includes a substrate having separated electrically conductive traces and another substrate having a resistive layer in which the substrates are subjected to a biasing force such that the substrates contact one another with the resistive layer electrically connecting the traces with a resistance inversely dependent on the biasing force. Upon an external force applied towards a substrate, the substrates contact one another with a total force which is the sum of the forces with the resistive layer electrically connecting the traces with a resistance inversely dependent on the total force. An FSR output which is a function of the resistance is measured. Whether a change in magnitude of the FSR output during a time interval is greater than a threshold is determined. A touch applied on the FSR is detected during the time interval if the change is greater than the threshold.