Haptic feedback system and method
A haptic feedback system includes movable and static portions coupled by one or more magnetic fields that serve to retard movement of the movable portion with respect to the static portion so as to provide haptic feedback when the movable portion is moved relative to the static portion. A magnet associated with one of the movable and static portions reacts with structure associated with the other of the movable and static portions so as to provide haptic feedback when the movable portion is moved with respect to the static portion.
1. A system for providing haptic feedback regarding movement of a first member relative to a corresponding second member, comprising:
a first magnetic field generator associated with one of said first member and said second member;
a first magnetic field coupler associated with the other of said first member and said second member; and
a touch sensor associated with said first member;
wherein said first magnetic field generator establishes a first magnetic field proximate said first magnetic field generator;
wherein said first magnetic field variably couples to said first magnetic field coupler as a function of the position of said first magnetic field generator relative to the position of said first magnetic field coupler;
wherein said first magnetic field tends to maintain said first magnetic field coupler in at least a first predetermined relationship with respect to said first magnetic field generator; and
wherein the operation of said touch sensor is not dependent on said first magnetic field.
2. The system of claim 1 wherein one of said first member and said second member is a static member.
3. The system of claim 2 wherein the other of said first member and said second member is a movable member.
4. The system of claim 1 wherein said first magnetic field generator comprises a permanent magnet.
5. The system of claim 1 wherein said first magnetic field generator comprises an electromagnet.
6. The system of claim 5 wherein said electromagnet is selectively and/or variably magnetizable.
7. The system of claim 1 wherein said first magnetic field coupler comprises a ferromagnetic material.
8. The system of claim 1 wherein said first magnetic field coupler comprises a second magnetic field generator.
9. The system of claim 1 further comprising a second magnetic field generator associated with one of said first member and said second member.
10. The system of claim 9 further comprising a second magnetic field coupler associated with the other of said first member and said second member.
11. The system of claim 1 wherein at least one of said first magnetic field generator and said first magnetic field coupler is in movable engagement with said corresponding static member and movable member.
12. The system of claim 1 wherein said touch sensor comprises at least one sensing electrode and a control circuit adapted to generate an electric field about said sensing electrode and to detect disturbances to said electric field.
13. The system of claim 1 wherein said second member further comprises structure adapted to disturb said electric field in response to movement of said second member with respect to said first member.
14. The system of claim 1 wherein said second member further comprises means for disturbing said electric field in response to movement of said second member with respect to said first member.
15. The system of claim 1 wherein said second member is movable with respect to said first member.