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Browse Prior Art Database

SILENT ALERT DEVICE

IP.com Disclosure Number: IPCOM000006425D
Original Publication Date: 1992-May-01
Included in the Prior Art Database: 2002-Jan-02
Document File: 1 page(s) / 59K

Publishing Venue

Motorola

Related People

Michael P. Goldenberg: AUTHOR

Abstract

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.

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0' M

MOTOROLA INC. Technical Developments Volume 15 May 1992

SILENT ALERT DEVICE

by Michael F! Goldenberg

  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.

Elastic bellows/prod Pie20 ceramic diaphragm bender

sealed fluid cavi

Fig.

1

0 Motorola, IX 1992 95

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