Patent ID: 6181799
Filing Date: 2001-01-30
Classification: B42D,B60R,G06F,G07F,H04R

Abstract:
A greetings card comprising:a pair of leaves, at least one of said leaves being in the form of a panel member, the member having capability to sustain and propagate input vibrational energy by a plurality of resonant bending wave modes in at least one operative area extending transversely of thickness, wherein frequencies of resonant bending wave modes are interleaved in the predetermined frequency range so that the frequencies of the resonant bending wave modes are substantially evenly distributed;a transducer mounted on said operative area of the member, at a preferential location or site for coupling to the resonant bending wave modes, wherein the transducer is an exciter for exciting resonant bending wave modes in the member, the resonant bending wave modes in turn producing an acoustic output; andmeans associated with the leaves for triggering actuation of the transducer on movement of one leaf relative to the other leaf.