Multiple-touch sensor

• US 7,952,564 B2
• Filed: 02/16/2006
• Issued: 05/31/2011
• Est. Priority Date: 02/17/2005
• Status: Expired due to Fees

• Current Assignee: David Ritchie, Donald W. Bouldin, Hurst G. Samuel, Robert J. Warmack, Rufus H. Richie
• Original Assignee: David Ritchie, Donald W. Bouldin, Hurst G. Samuel, Robert J. Warmack, Rufus H. Richie
• Inventors: Hurst, G. Samuel, Warmack, Robert J., Richie, Rufus H., Bouldin, Donald W., Ritchie, David
• Primary Examiner(s): Kumar, Srilakshmi K
• Application Number:
  US11/356,431
• Publication Number:
  US 20060197752A1
• Time in Patent Office: 1,930 Days
• Field of Search: 345/156, 345173-178, 178 1801- 1809, 178/20.01
• US Class Current: 345/173
• CPC Class Codes: G06F 3/047 using sets of wires, e.g. crossed wires

Abstract

A touch sensor method and device are described that allow one or more simultaneous touches to be sensed and mapped to Cartesian coordinates. The device utilizes closely spaced multiple conducting strips to provide digital location of a touch position according to the position strip and analog location along the length of the strip. When the strips are energized individually and in coordinated ways, multiple touches are individually sensed and their positions are reported.

Claims

1. A multiple touch sensor which requires a conductive coupling internal of the sensor to effect a touch of the sensor, the multiple touch sensor comprising:

an electrically insulating substrate having two sides and a touch region on one of the two sides;

a plurality of electrically-conducting band segments coupled to and traversing the touch region and wherein the band segments are insulated from one another;

a cover layer overlying the touch region and having two opposite sides;

a controller providing an electrical means of sequentially energizing a plurality of the segments and an electrical means for monitoring the electrical characteristics of the touch sensor and for identifying the locations at which touch positions on the touch sensor are touched from the monitored electrical characteristics; and

the cover layer has an electrically-conductive surface on one of its two opposite sides wherein the electrically-conductive surface is supported in an insulated relationship with the touch region but is capable of being moved into contact with the touch region and the band segments coupled thereto when external pressure is applied to the side of the cover layer opposite the electrically-conductive surface so that a touch of the sensor is effected by the conductive coupling between the touch region and the band segments when the touch region is moved into contact with the band segments; and

wherein the controller is adapted to identify multiple locations on the touch region which are simultaneously touched upon movement of the cover layer into contact with the touch region at the multiple locations.

2. The touch sensor of claim 1, in which insulating spacers are positioned between the cover layer and the touch region to prevent electrical contact between the cover layer and the touch region unless external pressure is applied to a side of the cover layer as aforesaid.

3. The touch sensor of claim 1, in which the substrate, the band segments, and the cover layer are transparent over the touch region.

4. The touch sensor of claim 1 in which the cover layer is an insulating film.

5. The touch sensor of claim 1, which further comprises a conductive guard layer on the electrically insulating substrate on the side opposite the side of the touch region.

6. The touch sensor of claim 1 in which the controller provides a means of monitoring the current delivered to each end of the band segments for identifying the locations at which at the touch positions on the touch sensor are touched.

7. The touch sensor of claim 1 in which the controller provides a means of sequentially energizing a plurality of the said segments of the touch sensor with an oscillating voltage and monitoring the oscillating current at each end of the band segments for identifying the locations at which the touch positions on the touch sensor are touched.

8. The touch sensor of claim 1 in which the controller provides a means of monitoring the voltage delivered to the cover layer by each band or group of bands for identifying the locations at which the touch positions on the touch sensor are touched from the monitored voltage.

9. The touch sensor of claim 1 in which the controller provides an electrical means of sequentially energizing a plurality of the said segments of the touch sensor and sequentially energizes band segments of the touch sensor and electrically determines the coordinates of a plurality of touch positions on the touch sensor.

10. A multiple touch sensor system which requires a conductive coupling internal of the sensor system to effect a touch of the sensor system, the multiple touch sensor system comprising:

an electrically insulating substrate having a touch region;

a cover coupled to the touch region and having two opposite sides;

a plurality of electrically-conducting band segments coupled to and traversing the touch region;

wherein the cover has an electrically-conductive surface on one of its two opposite sides and the electrically-conductive surface is supported in an insulated relationship with the touch region but is capable of being moved into contact with the touch region and the band segments coupled thereto when external pressure is applied to the side of the cover layer opposite the electrically-conductive surface so that a touch of the sensor system is effected by the conductive coupling between the touch region and the band segments when the touch region is moved into contact with the band segments; and

a means whereby touches upon the side of the cover opposite the electrically-conductive surface are used to encode information that is transmitted to an external system and whereby multiple locations on the touch screen which are simultaneously touched are identified upon movement of the cover layer into contact with the touch region at the multiple locations.

11. The system of claim 10 where the encoded information is generated in the complete absence of light.

12. The system of claim 10 where the code is Braille-based.

13. The system of claim 10 where the code is binary-based.

14. The system of claim 10 where custom codes are used to accommodate to the preference of the sender.

15. The system of claim 10 in which the external system includes a computer monitor.

16. The system of claim 10 in which the coded information is transmitted to an external system.

17. The system of claim 16 in which the information at the distant user'"'"'s site is monitored and converted by a transducer to a useful form.

18. The system of claim 17 in which monitoring is done with an audio converter.

19. The system of claim 17 in which monitoring is done with a visual converter.

20. A multiple touch sensor system which requires a conductive coupling internal of the sensor system to effect a touch of the sensor system, the multiple touch sensor system comprising:

an electrically insulating substrate having two sides and a touch region on one of the two sides;

a plurality of electrically-conducting band segments coupled to and traversing the touch region and wherein the band segments are insulated from one another;

a cover with an electrically-conductive surface that is supported in an insulated relationship with the touch region but is able to be moved into contact with the touch region upon application of external pressure to the side of the cover opposite the electrically-conductive surface so that a touch of the sensor system is effected by the conductive coupling between the touch region and the band segments when the touch region is moved into contact with the band segments; and

a controller providing an electrical means of sequentially energizing a plurality of the segments and an electrical means for monitoring the electrical characteristics of the touch region and for identifying the locations of a plurality of touch positions on the touch region from the monitored electrical characteristics; and

a means by which the weight of an object left on the cover will cause contact between the electrically-conductive surface of the cover and the electrically conducting band segments so that the shape of the object in contact with the touch region can be determined; and

wherein the controller is adapted to identify multiple locations on the touch region which are simultaneously touched upon movement of the cover layer into contact with the touch region at the multiple locations.

21. The touch sensor system of claim 20, which further includes a predetermined pattern of insulating and conductive spacers positioned between the cover and the touch region to permit electrical contact between the cover and the individual electrically conducting band segments at only one point each.

22. The predetermined pattern of claim 21 in which the area pattern of the object is determined.

23. The predetermined pattern of claim 20 in which the weight distribution of the object is sensed.

24. A method for identifying the locations at which multiple touch positions on a touch sensor are touched, said method comprising the steps of:

providing a touch screen which requires a conductive coupling internal of the touch sensor to effect a touch of the sensor including;

(a) an electrically insulating substrate having two sides and a touch region on one of the two sides;

(b) a plurality of electrically-conductive band segments coupled to and traversing the touch region and wherein the band segments are insulated from one another;

(c) a cover layer overlying the touch region and having two opposite sides; and

(d) a controller providing an electrical means of sequentially energizing a plurality of the segments and an electrical means for monitoring the electrical characteristics of the touch sensor and for identifying the locations at which touch positions on the touch sensor are touched from the monitored electrical characteristics, and the cover layer has an electrically-conductive surface on one of its two opposite sides and wherein the electrically-conductive surface is supported in an insulated relationship with the touch region but is capable of being moved into contact with the touch region when an external pressure is applied to the side of the cover layer opposite the electrically-conductive surface so that a touch of the sensor is effected by the conductive coupling between the touch region and the band segments when the touch region is moved into contact with the band segments and wherein the controller is adapted to identify multiple locations on the touch region which are simultaneously touched upon movement of the cover layer into contact with the touch region at the multiple locations;

sequentially energizing a plurality of the segments;

monitoring the electrical characteristics of the touch sensor, and

identifying the locations at which multiple touch positions on the touch region are touched from the monitored electrical characteristics.

25. A method according to claim 24 in which regions-of-interest are selected simultaneously using a plurality of simultaneous touches.

26. A method according to claim 25 which further allows operations to be activated with additional simultaneous touches.

27. A method according to claim 24 that allows an operator to input data to an electronic device without requiring the operator to look at the placement of the fingers.