Inertial vibration transducers

An inertial vibration transducer for exciting a member having capability to sustain and propagate input vibrational energy by bending waves in at least one operative area extending transversely of thickness, the transducer comprising a motor coil assembly having a coil rigidly fixed to a tubular member which is adapted to be rigidly mounted directly to the member to be vibrated, a magnet assembly disposed concentrically with respect to the motor coil assembly, and a resilient suspension supporting the magnet assembly for axial movement relative to the motor coil assembly, wherein the motor coil assembly is adapted for reception in a corresponding shaped cavity in the member.

An inertial vibration transducer for exciting a member having capability to sustain and propagate input vibrational energy by bending waves in at least one operative area extending transversely of thickness, the transducer comprising a motor coil assembly having a coil rigidly fixed to a tubular member which is adapted to be rigidly mounted directly to the member to be vibrated, a magnet assembly disposed concentrically with respect to the motor coil assembly, a resilient suspension supporting the magnet assembly for axial movement relative to the motor coil assembly, and caps closing the axial ends of the tubular member, wherein the caps comprise the resilient suspension.

An inertial vibration transducer for exciting a member having capability to sustain and propagate input vibrational energy by bending waves in at least one operative area extending transversely of thickness, the transducer comprising complementary magnet assemblies and motor coil assemblies adapted for mounting on opposite faces of the member and a fastener tying the magnet assemblies together for push-pull operation, wherein each motor coil assembly has a coil rigidly fixed to a tubular member which is adapted to be rigidly mounted directly to the member to be vibrated, each magnet assembly is disposed concentrically with respect to its respective motor coil assembly, and a resilient suspension supports the magnet assemblies for axial movement relative to the motor coil assemblies.

A loudspeaker comprising:

• a member having capability to sustain and propagate input vibrational energy by bending waves in at least one operative area extending transversely of thickness, and
• an inertial transducer mounted on said member to vibrate the member forming an acoustic radiator which provides an acoustic output, the transducer comprising:
• a motor coil assembly having a coil rigidly fixed to a tubular member which is rigidly mounted directly to the member to be vibrated, a magnet assembly disposed concentrically with respect to the motor coil assembly, and a resilient suspension supporting the magnet assembly for axial movement relative to the motor coil assembly, wherein the resilient suspension comprises mutually opposed elastomeric members disposed on opposite sides of the magnet assembly.

A loudspeaker comprising:

• a member having capability to sustain and propagate input vibrational energy by bending waves in at least one operative area extending transversely of thickness, and
• an inertial transducer mounted on said member to vibrate the member forming an acoustic radiator which provides an acoustic output, the transducer comprising:
• a motor coil assembly having a coil rigidly fixed to a tubular member which is rigidly mounted directly to the member to be vibrated, a magnet assembly disposed concentrically with respect to the motor coil assembly, and a resilient suspension supporting the magnet assembly for axial movement relative to the motor coil assembly, wherein the motor coil assembly is received in a correspondingly shaped cavity in the radiator.

A loudspeaker comprising:

• a member having capacity to sustain and propagate input vibrational energy by bending waves in at least one operative area extending transversely of thickness, and
• an inertial transducer mounted on said member to vibrate the member forming an acoustic radiator which provides an acoustic output, the transducer comprising:
• a motor coil assembly having a coil rigidly fixed to a tubular member which is rigidly mounted directly to the member to be vibrated, a magnet assembly disposed concentrically with respect to the motor coil assembly, a resilient suspension supporting the magnet assembly for axial movement relative to the motor coil assembly, and caps closing the axial ends of the tubular member, wherein the caps comprise the resilient suspension.

A loudspeaker comprising:

• a member having capacity to sustain and propagate input vibrational energy by bending waves in at least one operative area extending transversely of thickness, and
• an inertial transducer mounted on said member to vibrate the member forming an acoustic radiator which provides an acoustic output, the transducer comprising complementary magnet assemblies and motor coil assemblies mounted on opposite faces of the member and a fastener tying the magnet assemblies together for push-pull operation,
• wherein each motor coil assembly has a coil rigidly fixed to a tubular member which is rigidly mounted directly to the member to be vibrated, each magnet assembly is disposed concentrically with respect to its respective motor coil assembly, and a resilient suspension supports the magnet assemblies for axial movement relative to the motor coil assemblies.