Touch switches and practical applications therefor
A touch switch apparatus emulating a mechanical switch includes a field effect sensor and an electric field stimulator mechanically associated with the field effect sensor. A field generation signal applied to the field effect sensor causes an electric field to be generated thereabout. The electric field stimulator can be moved between first and second positions with respect to the field effect sensor. When moved into proximity with the field effect sensor, the electric field stimulator disturbs the electric field. A detection circuit coupled to the field effect sensor detects and responds to the disturbance to the electric field.
1. An apparatus emulating a mechanical switch, comprising:
a substrate;
a first field effect sensor disposed on said substrate;
a first electric field stimulator operably associated with said first field effect sensor, wherein said first electric field stimulator is movable along a predetermined path, said predetermined path having at least a first point relatively near to said first field effect sensor and a second point relatively far from said first field effect sensor; and
a shaft extending from said substrate and in pivotable engagement with said substrate, wherein said first electric field stimulator moves with respect to said first field effect sensor in response to pivoting of said shaft with respect to said substrate.
2. The apparatus of claim 1 further comprising a second shaft coupled to said shaft proximate said substrate.
3. The apparatus of claim 2 further comprising means for latching said shaft in a first position wherein said first electric field stimulator is relatively near to said first field effect sensor and/or a second position wherein said first electric field stimulator is relatively far from said first field effect sensor.
4. The apparatus of claim 1 further comprising:
a second field effect sensor disposed on said substrate;
a second shaft extending from said substrate and in pivotable engagement with said substrate; and
a second electric field stimulator operably associated with said second shaft, wherein said second electric field stimulator is movable along a second predetermined path, said second predetermined path having at least a third point relatively near to said second field effect sensor and at least a fourth point relatively far from said second field effect sensor.
5. An apparatus emulating a mechanical switch, comprising:
a substrate;
a first field effect sensor disposed on said substrate;
a first electric field stimulator operably associated with said first field effect sensor, wherein said first electric field stimulator is movable along a predetermined path, said predetermined path having at least a first point relatively near to said first field effect sensor and a second point relatively far from said first field effect sensor;
a shaft extending from said substrate;
a first knob disposed about said shaft, said first electric field stimulator disposed on said first knob;
a second knob disposed about said first knob; and
a second electric field stimulator disposed on said second knob.
6. The apparatus of claim 5 further comprising:
a second field effect sensor disposed on said substrate;
wherein said second electric field stimulator is movable along a second predetermined path, said second predetermined path having at least a third point relatively near to said second field effect sensor and at least a second point relatively far from said second field effect sensor.
7. The apparatus of claim 5 further comprising a light source, wherein said light source is in optical communication with said first end of said shaft, and wherein said shaft is adapted to transmit said light through at least a portion thereof.
8. The apparatus of claim 1 wherein said shaft is flexible and wherein said first electric field stimulator moves with respect to said first field effect sensor in response to flexing of said shaft.
9. An apparatus emulating a mechanical switch, comprising:
a substrate;
a first field effect sensor disposed on said substrate;
a first electric field stimulator operably associated with said first field effect sensor, wherein said first electric field stimulator is movable along a predetermined path, said predetermined path having at least a first point relatively near to said first field effect sensor and a second point relatively far from said first field effect sensor;
a second field effect sensor;
a first resistor coupled in series between a first terminal of said first field effect sensor and a first terminal of said second field effect sensor; and
a detection circuit coupled in series between a second terminal of said first field effect sensor and a second terminal of said second field effect sensor.
10. The apparatus of claim 9 further comprising:
a third field effect sensor; and
a second resistor coupled in series between said second terminal of said second field effect sensor and a first terminal of said third field effect sensor;
wherein said detection circuit is coupled in series between said second terminal of said first field effect sensor and a second terminal of said third field effect sensor.
11. An apparatus for emulating a mechanical switch, comprising:
a substrate, said substrate defining a surface substantially comprising at least a portion of a sphere;
at least one field effect sensor operably associated with said substrate proximate said surface;
a substantially spherical member in operable association with said surface; and
at least one electric field stimulator in operable association with said substantially spherical member;
whereby rotation of said substantially spherical member with respect to said surface causes said at least one electric field stimulator to travel through a path substantially toward and away from said at least one field effect sensor.
12. The apparatus of claim 1 , further comprising a second field effect sensor disposed on said substrate, wherein said first electric field stimulator is movable along a second predetermined path, said second predetermined path having at least a third point relatively near to said second field effect sensor and a fourth point relatively far from said second field effect sensor.
13. The apparatus of claim 12 wherein said second predetermined path is contiguous with said predetermined path.
14. The apparatus of claim 8 further comprising:
a second field effect sensor disposed on said substrate;
a second shaft extending from said substrate and in pivotable engagement with said substrate; and
a second electric field stimulator operably associated with said second shaft, wherein said second electric field stimulator is movable along a second predetermined path, said second predetermined path having at least a third point relatively near to said second field effect sensor and at least a fourth point relatively far from said second field effect sensor.
15. The apparatus of claim 5 further comprising a second electric field stimulator disposed on said first knob, wherein said second electric field stimulator is movable along a predetermined path, said predetermined path having at least a third point relatively near to said first field effect sensor and a fourth point relatively far from said first field effect sensor.
16. The apparatus of claim 5 further comprising:
a second field effect sensor disposed on said substrate; and
a second electric field stimulator operably associated with said second field effect sensor, wherein said second electric field stimulator is movable along a second predetermined path, said second predetermined path having at least a third point relatively near to said first field effect sensor and a fourth point relatively far from said first field effect sensor.