Transducer assembly for automatic message system

DETAILED DESCRIPTION I claim: 1.
A sound transducer for converting energy between electrical signals and sound comprising a housing, a field magnet mounted in the housing the field magnet producing a magnetic field in the space surrounding the field magnet, a voice coil positioned adjacent to the field magnet and a location under the influence of the field produced by the field magnet, and a vibration transmitting baffle connected to the voice coil and arranged substantially coaxially with the voice coil, the vibration transmitting baffle including means defining a generally conically-shaped portion and a bellows fold extending along the periphery of the larger end of the conically-shaped portion so that the shape of the conically-shaped portion and the bellows fold cooperate to limit transmitted vibration of the conically-shaped portion to movement along a substantially linear path oriented along the axis of the voice coil; the vibration transmitting baffle including means for evenly contacting a sounding surface and the conically-shaped portion of the vibration transmitting baffle including a truncated portion which is truncated at a location near the apex of the conically-shaped portion, the truncated portion defining a substantially flat surface extending transverse to the axis of the voice coil, and the substantially flat surface providing said means for evenly contacting a sounding surface.
2.
The device of claim 1 wherein the bellows fold is shaped to stabilize the voice coil.
3.
The device of claim 1 wherein the bellows fold is shaped to maintain an edge of the vibration transmitting baffle in a relatively stationary condition and to thereby restrict motion of the conically-shaped portion to motion in a substantially linear direction along the axis of the voice coil.
4.
The device of claim 2 wherein the vibration transmitting baffle includes means defining stiffening ribs extending along the conically-shaped portion.
5.
The device of claim 4 wherein the ribs extend radially outward from a location situated near the center of the conically-shaped portion of the vibration transmitting baffle