Abstract: A sound generator and method of projecting sound that includes a piezoelectric buzzer secured to a tensioned, flexible surface of an inflatable object, the surface being under tension in response to variations of pressure within the object. The sound generator includes a sound source and a piezoelectric buzzer electrically connected with each other so that the sound source generates signals, the piezoelectric buzzer converts the signals into sounds and the tensioned, flexible surface amplifies the sounds.

Abstract: A generally pyramid shaped sound module is provided that is attachable to a balloon for producing hi-fidelity sound effects. The sound module includes a piezoelectric element connected at the top of the pyramid shaped piezo amplification device. An electric circuit is connected to the piezoelectric element by wires. The electric circuit includes a power supply, such as one or more batteries, and the circuitry necessary for producing or reproducing a desired sound (e.g. musical notes, voices, sounds, prerecorded sound, a combination of the aforementioned, etc.). The pyramid shape allows the piezoelectric element to be coupled to the balloon without physically touching the balloon surface. Thus, even when the balloon begins to deflate, the sound quality of the sound module can be maintained.

Abstract: The invention provides a balloon and a method for heat tacking one side of an object to an interior of the balloon without the other side of the object becoming attached to the balloon. The balloon is formed from at least a top sheet and a bottom sheet of a substantially gas-impermeable, heat-sealable material such as BON. A portion of the object is chosen to be heat sealed to the interior of the balloon. The reverse side of the portion of the object is coated with a heat resistant barrier such as synthetic resinous fluorine-containing polymer, heat-resistant nitrocellulose ink or the like. The object is then placed between the two sheets that form the balloon. A heating element is applied to the sheet on which the object will be attached and a pressure plate is applied on the other sheet thus forming a sandwich. This sandwich heat stakes one side of the object to the balloon while the heat resistant barrier prevents the other side from attaching to the balloon.