TOUCH SWITCHES AND PRACTICAL APPLICATIONS THEREFOR

• US 20120267964A1
• Filed: 07/02/2012
• Published: 10/25/2012
• Est. Priority Date: 01/19/1999
• Status: Active Grant

• Current Assignee: Touchsensor Technologies LLC (Methode Electronics Incorporated)
• Original Assignee: Touchsensor Technologies LLC (Methode Electronics Incorporated)
• Inventors: Caldwell, David W., Oppor, Rick L., Gioiosa, Anthony V., Campbell, Robert B., Schreiber, Thomas M., Wadia, Bahar N., Mathews, Mark R., Mueller, Donald Charles, Eavenson, Daniel
• Granted Patent: US 9,306,561 B2
• Time in Patent Office: Days
• US Class Current: 307/112
• CPC Class Codes: A47B 57/00 Cabinets, racks or shelf units, characterised by features for adjusting shelves or partitions shelf units with stackable uprights A47B87/00; details of cabinets, racks or shelf units in general A47B96/00; brackets adjustable in themselves A47B96/07
• CPC Class Codes: A47B 96/025 Shelves with moving elements, e.g. movable extensions or link elements cabinets, racks or shelf units enabling enlargement in height, length or depth A47B45/00
• CPC Class Codes: F25D 2325/022 Shelves made of glass or ceramic
• CPC Class Codes: F25D 2331/803 Bottles
• CPC Class Codes: F25D 25/02 by shelves
• CPC Class Codes: G09F 3/204 specially adapted to be attached to a shelf or the like
• CPC Class Codes: G09F 9/30 in which the desired character or characters are formed by combining individual elements panels comprising a number of electrodes in a single cell controlling light arriving from an independent light source, e.g. electro-optical or magneto-optical cell, G02F1/00
• CPC Class Codes: H03K 17/96 Touch switches specially adapted for electronic time-pieces with no moving parts G04G21/08
• CPC Class Codes: H03K 17/962 Capacitive touch switches
• CPC Class Codes: H03K 17/9622 using a plurality of detectors, e.g. keyboard
• CPC Class Codes: H03K 2017/9602 characterised by the type or shape of the sensing electrodes

Abstract

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.

Claims

1. An apparatus emulating a mechanical switch, comprising:

a substrate;

a first field effect sensor disposed on said substrate; and

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.

2. 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 predetermined path, said predetermined path having at least a first point relatively near to said second field effect sensor and a second point relatively far from said second field effect sensor.

3. The apparatus of claim 1 further comprising:

a second field effect sensor disposed on said substrate; and

a second electric field stimulator operably associated with said first 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.

4. The apparatus of claim 1 further comprising 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.

5. The apparatus of claim 4 further comprising a second shaft coupled to said shaft proximate said substrate.

6. The apparatus of claim 5 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.

7. The apparatus of claim 4 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 first field effect sensor.

8. The apparatus of claim 1 further comprising a shaft extending from said substrate and a knob disposed about said shaft, said first electric field stimulator disposed on said knob.

9. The apparatus of claim 8 further comprising:

a second field effect sensor disposed on said substrate;

a second knob disposed about said first knob; and

a second electric field stimulator disposed on said second knob;

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.

10. The apparatus of claim 8 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.

11. The apparatus of claim 8 wherein said shaft is flexible and extends from said substrate and wherein said first electric field stimulator moves with respect to said first field effect sensor in response to flexing of said shaft.

12. The apparatus of claim 1 further comprising:

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.

13. The apparatus of claim 12 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.

14. The apparatus of claim 1 wherein said first electric field stimulator is slidingly engaged with said substrate.

15. 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 shaft 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.

16. An apparatus for emulating a mechanical switch, comprising:

a variable impedance wire having a length, a first end and a second end, said first end of said wire electrically connected to a first terminal of a signal generation and detection circuit and said second end of said wire electrically connected to a second terminal of said signal generation and detection circuit; and

an electric field stimulator operably associated with said wire, said electric field stimulator movable between a first position along the length of said wire relative to said first end of said wire and a second position along the length of said wire relative to said first end of said wire.