Abstract: A touch sensitive device for generating contextual haptic feedback comprising a touch sensitive member, a transducer mounted to the member, a processor comprising a control process and a further processing device connected to the processor, the further processing device being adapted to use a context map to enable signals to be provided to the transducer, whereby the transducer can couple vibrational energy to the touch sensitive member to provide haptic feedback.

Abstract: A touch sensitive device for generating contextual haptic feedback comprising a touch sensitive member, a transducer mounted to the member, a processor comprising a control process and a further processing device connected to the processor, the further processing device being adapted to use a context map to enable signals to be provided to the transducer, whereby the transducer can couple vibrational energy to the touch sensitive member to provide haptic feedback.

Abstract: An inertial force transducer having an operative frequency range comprises a resonant element having a frequency distribution of modes in the operative frequency range of the transducer and a coupler for mounting the resonant element to a site to which force is to be applied. The resonant element is a piezoelectric device comprising a layer of piezoelectric material and a substrate layer on the layer of piezoelectric material. The substrate layer has a region extending beyond the piezoelectric layer, with the coupler mounted to the extended region whereby the low frequency performance of the transducer is extended.

Abstract: An electromechanical force transducer comprises at least two adjacent resonant elements and a damping layer coupled between their adjacent faces. The damping layer is selected so that the output is increased in the region of internal cancellation in the transducer. The adjacent resonant elements are beam-like and have substantially the same length. The resonant elements may be supported on a stub of low rotational stiffness whereby the fundamental resonance of the transducer becomes less dependent on bending motion of the transducer and more rigid body-like. The transducer may also include a member for increasing the rotational impedance of the transducer.