SILENT ALERT DEVICE
Original Publication Date: 1992-May-01
Included in the Prior Art Database: 2002-Jan-02
There are several approaches that can be taken to This invention solves these problems by using a fluid provide a silent alert device for a wrist-worn product. One coupling between the piezo drive element and the prod. such method would be to manufacture a P&o-driven When a voltage is applied, the piezo bender diaphragm prod which would tap the wearer's skin to initiate a tactile flexes, compressing the fluid (gas or liquid) which forces response. Some of the major problems encountered in the bellows/prod into the wearer's skin. As designed, developing this type of device include: preventing the the prod cannot be forced into the caseback enough to prod from causing damage to the drive device when an damage the piezo. The bellows serves double-duty as a excessive external force is applied, maintaining "water- seal/force transmitter. Proper choice of the bender to tight" integrity, and developing enough displacement of bellows surface area ratio will result in a multiplied the prod to effect a significant tactile response. displacement at the prod.