Force invariant touch sensitive actuator
First Claim
1. A load control device for controlling the amount of power delivered to an electrical load from an AC power source, the load control device comprising:
- a semiconductor switch operable to be coupled in series electrical connection between the source and the load, the semiconductor switch having a control input for controlling the semiconductor switch between a non-conductive state and a conductive state;
a controller operatively coupled to the control input of the semiconductor switch for controlling the semiconductor switch between the non-conductive state and the conductive state;
a touch sensitive actuator having a touch sensitive front surface responsive to a point actuation characterized by a position and a force, the touch sensitive actuator having an output operatively coupled to the controller for providing an output voltage;
a usage detection circuit operatively coupled between the output of the touch sensitive actuator and the controller, the usage detection circuit operable to generate a first control signal; and
a stabilizing circuit operatively coupled between the output of the touch sensitive actuator and the controller, the stabilizing circuit operable to generate a second control signal;
wherein the second control signal is representative of only the position of the point actuation on the touch sensitive front surface of the touch sensitive actuator, and the first control signal is representative of whether the point actuation is presently occurring on the front surface, the first control signal characterized by a faster response than the second control signal, such that the controller controls the semiconductor switch in response to the second control signal when the controller determines that the point actuation is presently occurring in response to the first control signal.
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Accused Products
Abstract
A load control device, such as a dimmer switch, has a touch sensitive actuator, such as a three-wire touch sensitive screen, that produces an output voltage representing the position of a manual pressure touch along a longitudinal axis of the actuator. A stabilizing circuit receives the output voltage of the actuator and comprises, for example, a capacitor. The stabilizing circuit operates to prevent the detection of transient touches and touches having less than a certain actuation force, such that the output voltage is responsive only to the position of the touch. In addition, a usage detection circuit may also be coupled to the output voltage of the actuator for determining whether the touch is presently occurring. Alternatively, the actuator may comprise a four-wire touch sensitive screen that produces a first output voltage received by the stabilizing circuit and a second output voltage received by the usage detection circuit.
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Citations
36 Claims
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1. A load control device for controlling the amount of power delivered to an electrical load from an AC power source, the load control device comprising:
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a semiconductor switch operable to be coupled in series electrical connection between the source and the load, the semiconductor switch having a control input for controlling the semiconductor switch between a non-conductive state and a conductive state; a controller operatively coupled to the control input of the semiconductor switch for controlling the semiconductor switch between the non-conductive state and the conductive state; a touch sensitive actuator having a touch sensitive front surface responsive to a point actuation characterized by a position and a force, the touch sensitive actuator having an output operatively coupled to the controller for providing an output voltage; a usage detection circuit operatively coupled between the output of the touch sensitive actuator and the controller, the usage detection circuit operable to generate a first control signal; and a stabilizing circuit operatively coupled between the output of the touch sensitive actuator and the controller, the stabilizing circuit operable to generate a second control signal; wherein the second control signal is representative of only the position of the point actuation on the touch sensitive front surface of the touch sensitive actuator, and the first control signal is representative of whether the point actuation is presently occurring on the front surface, the first control signal characterized by a faster response than the second control signal, such that the controller controls the semiconductor switch in response to the second control signal when the controller determines that the point actuation is presently occurring in response to the first control signal. - View Dependent Claims (2, 3, 4, 5)
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6. A user interface for a lighting control, the user interface comprising:
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a touch sensitive actuator having a touch sensitive front surface responsive to a point actuation characterized by a position and a force, the touch sensitive actuator having an output operatively coupled to the controller for providing an output voltage; a usage detection circuit operatively coupled the output of the touch sensitive actuator, the usage detection circuit operable to generate a first control signal representative of whether the point of actuation is presently occurring; a stabilizing circuit operatively coupled to the output of the touch sensitive actuator, the stabilizing circuit operable to stabilize the output voltage of the touch sensitive actuator, and to generate a second control signal representative of only the position of the point actuation on the touch sensitive front surface of the touch sensitive actuator, the stabilizing circuit having slower response time than the usage detection circuit; and a controller operatively coupled to the usage detection circuit and the stabilizing circuit, the controller responsive to the second control signal when the usage detection circuit has determined that the point actuation is presently occurring.
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7. A load control device for controlling the amount of power delivered to an electrical load from an AC power source, the load control device comprising:
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a semiconductor switch operable to be coupled in series electrical connection between the source and the load, the semiconductor switch having a control input for controlling the semiconductor switch between a non-conductive state and a conductive state; a controller operatively coupled to the control input of the semiconductor switch for controlling the semiconductor switch between the non-conductive state and the conductive state; a touch sensitive actuator having a touch sensitive front surface responsive to a point actuation characterized by a position and a force, the touch sensitive actuator having an output for providing an output voltage; a usage detection circuit operatively coupled between the output of the touch sensitive actuator and the controller, the usage detection circuit operable to generate a first control signal representative of whether the point of actuation is presently occurring; and a stabilizing circuit operatively coupled between the output of the touch sensitive actuator and the controller, the stabilizing circuit operable to stabilize the output voltage of the touch sensitive actuator and generate a second control signal representative of only the position of the point actuation on the touch sensitive front surface of the touch sensitive actuator; wherein the usage detection circuit has a faster response time than the stabilizing circuit, such that the controller controls the semiconductor switch in response to the second control signal when the controller determines that the point actuation is presently occurring in response to the first control signal. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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- 14. In a control circuit for operating an electrical load in response to an output signal from a touch pad, said touch pad comprising an elongated manually touchable resistive area which produces an output signal at an output terminal, said signal representative of the location at which the touch pad is manually touched, said control circuit including a microprocessor having an input connected to said output signal and producing an output for controlling said load in response to the manual input to said touch pad, the improvement comprising a filter capacitor connected between said output terminal and a ground terminal to define a resistive-capacitive circuit with the resistance of said touch pad, said resistive-capacitive circuit characterized by a time constant and being adapted to prevent large transient voltage changes due to low pressure touches of said touch pad, said filter capacitor both charging and discharging through said touch pad.
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27. In a manually operable control structure for producing an electrical signal dependent on the location at which a touch screen is touched;
- said control structure comprising a resistive touch screen having a control voltage connected to terminals at its opposite ends and an output terminal which is connected to said touch screen at the location of a local manual pressure applied to said screen by a user;
a microprocessor having an input connected to said output terminal and producing an output related to the position at which said screen receives said local manual pressure;
the improvement which comprises a filter capacitor connected between said output terminal and a ground terminal and defining an RC circuit with the resistance of said touch screen between said position at which said screen receives local manual pressure and one of its said terminals, said filter capacitor both charging and discharging through said touch pad. - View Dependent Claims (28, 29, 30, 31, 32, 33)
- said control structure comprising a resistive touch screen having a control voltage connected to terminals at its opposite ends and an output terminal which is connected to said touch screen at the location of a local manual pressure applied to said screen by a user;
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34. A process for generating an operating signal from a resistive touch screen in which an output voltage on an output terminal thereof is related to both the location on the screen area which is touched by a user'"'"'s finger and to the pressure of the touch;
- said process comprising the production of a usage detection signal in response to the touching of said screen at any location on its surface and the production of a position signal in response to the location at which the screen is touched, and applying said usage detection and position signals to a microprocessor;
said microprocessor producing an output signal to a circuit to be controlled only when said usage detection signal is present and said position signal is also present at the end of a predetermined sample interval,wherein the position signal is substantially responsive only to the position of the point actuation on the touch sensitive front surface of the touch sensitive actuator and the usage detection signal is representative of whether an actuation is presently occurring, said usage detection signal having a faster response time than said position signal. - View Dependent Claims (35, 36)
- said process comprising the production of a usage detection signal in response to the touching of said screen at any location on its surface and the production of a position signal in response to the location at which the screen is touched, and applying said usage detection and position signals to a microprocessor;
Specification