PROXIMITY SWITCH ASSEMBLY HAVING NON-SWITCH CONTACT AND METHOD

• US 20130321065A1
• Filed: 05/29/2012
• Published: 12/05/2013
• Est. Priority Date: 05/29/2012
• Status: Active Grant

• Current Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Original Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Inventors: Salter, Stuart C., Buttolo, Pietro, Gardner, Cornel Lewis
• Granted Patent: US 8,981,602 B2
• Time in Patent Office: Days
• US Class Current: 327/517
• CPC Class Codes: H03K 17/9622 using a plurality of detectors, e.g. keyboard
• CPC Class Codes: H03K 2217/94036 Multiple detection, i.e. where different switching signals are generated after operation of the user is detected at different time instants at different locations during the actuation movement by two or more sensors of the same or different kinds
• CPC Class Codes: H03K 2217/960705 Safety of capacitive touch and proximity switches, e.g. increasing reliability, fail-safe

Abstract

A proximity switch assembly includes first and second proximity switches comprising first and second proximity sensors and a tactile feature disposed between the first and second proximity switches. The assembly also includes controlling circuitry detecting an object on the tactile feature based on sensed signals from the first and second proximity sensors and preventing activation of the first and second switches when an object is detected on the tactile feature. The assembly further includes a resting pad having a third sensor, wherein the control circuitry detects an object with the first sensor and an object on the resting pad and determines activation of the first and second proximity switches based on the detected objects.

Claims

1. A proximity switch assembly comprising:

a first proximity switch comprising a first proximity sensor;

a second proximity switch comprising a second proximity sensor;

a tactile feature disposed between the first and second proximity switches; and

control circuitry detecting an object on the tactile feature based on sensed signals from the first and second proximity sensors and preventing activation of the first and second switches when an object is detected on the tactile feature.

2. The proximity switch assembly of claim 1, wherein the tactile feature comprises an outward extending member.

3. The proximity switch assembly of claim 2, wherein the outward extending member comprises a ridge.

4. The proximity switch assembly of claim 1, wherein the control circuitry activates the first proximity switch based on a signal associated with the first proximity sensor exceeding a threshold when no object is detected on the tactile feature.

5. The proximity switch assembly of claim 1 further comprising a resting pad comprising a third sensor for sensing an object on a resting pad, wherein the control circuitry determines activation of one of the first and second proximity switches based on detection of an object on the resting pad.

6. The proximity switch assembly of claim 5, wherein the control circuitry allows activation of one of the first and second proximity switches when an object is detected on the resting pad.

7. The proximity switch assembly of claim 5, wherein the control circuitry prevents activation of the first and second proximity switches when an object is detected on the resting pad.

8. The proximity switch assembly of claim 1, wherein each of the first and second proximity sensors comprises a capacitive sensor.

9. The proximity switch assembly of claim 1, wherein the proximity switch assembly is employed on a vehicle.

10. A proximity switch assembly comprising:

a first proximity switch comprising a first sensor;

a resting pad comprising a second sensor for sensing an object on the resting pad; and

control circuitry detecting a first object with the first proximity sensor and a second object on the resting pad and determining activation of the first proximity switch based on detection of the first and second objects.

11. The proximity switch assembly of claim 10 further comprising a second proximity switch comprising a third proximity sensor, and a tactile feature disposed between the first and second proximity switches, wherein the control circuitry detects an object on the tactile feature based on sensed signals from the first and third proximity sensors and prevents activation on the first and second switches when an object is detected on the tactile feature.

12. The proximity switch assembly of claim 11, wherein the control circuitry prevents activation of the first and second proximity switches when an object is detected on the tactile feature.

13. The proximity switch assembly of claim 11, wherein the control circuitry allows activation of the first and second proximity switches when an object is detected on the tactile feature.

14. The proximity switch assembly of claim 11, wherein the tactile feature comprises an outward extending member.

15. The proximity switch assembly of claim 14, wherein the outward extending member comprises a ridge.

16. The proximity switch assembly of claim 10, wherein the first proximity sensor comprises a capacitive sensor.

17. The proximity switch assembly of claim 10, wherein the proximity switch assembly is employed on the vehicle.

18. A method of controlling activation of proximity switches comprising:

sensing a first signal associated with a first sensor for a first proximity switch;

sensing a second signal associated with a second sensor for a second proximity switch;

detecting an object on a tactile feature disposed between the first and second proximity switches based on the first and second signals; and

controlling activation of the first and second switches based on the detected object.

19. The method of claim 18, wherein the step of controlling activation of the first and second switches comprises preventing activation of the first and second switches, when an object is detected on the tactile feature.

20. The method of claim 18 further comprising the step of sensing an object on a resting pad comprising a third sensor and determining activation of one of the first and second proximity switches based on detection of an object on the resting pad.