Browse Prior Art Database

SEALED TACTILE VIBRATING ALERT SYSTEM with ENERGY STORAGE ASSISTANCE

IP.com Disclosure Number: IPCOM000005963D
Original Publication Date: 1990-Oct-01
Included in the Prior Art Database: 2001-Nov-20
Document File: 2 page(s) / 105K

Publishing Venue

Motorola

Related People

Edward L. Ehmke: AUTHOR [+4]

Abstract

Many body-worn devices exist that provide some type of alert to the user, whether it be a timed alert in a watch, a message alert in a pager, an emergency alert in a radiation level detector, or any combination of these or other uses of alerts. These alerts typically are audible in nature and tend to be interruptive in a quiet atmosphere and ineffective in high ambient noise environments. A tactile alert has been utilized in some products which consists of a motor-driven off-balance weight system that transfers the vibration to the entire product in order for the user to notice the alert. These systems generally are expensive, large, unreliable, and require high energy input. With body-worn devices that make direct contact with the user, such as a watch, a pager, or a watch-pager combination, the technology exists to provide a tactile alert that can be produced in a low volume, low profile package applicable to even watches.

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MOZOROLA Technical Developments Volume 11 October 1990

SEALED TACTILE VIBRATING ALERT SYSTEM with ENERGY STORAGE ASSISTANCE

by Edward L. Ehmke, Robert D. Lloyd, Tuan K. Nguyen, and Thomas J. Rollins

   Many body-worn devices exist that provide some type of alert to the user, whether it be a timed alert in a watch, a message alert in a pager, an emergency alert in a radiation level detector, or any combination of these or other uses of alerts. These alerts typically are audible in nature and tend to be interruptive in a quiet atmosphere and ineffective in high ambient noise environments. A tactile alert has been utilized in some products which consists of a motor-driven off-balance weight system that transfers the vibration to the entire product in order for the user to notice the alert. These systems generally are expensive, large, unreliable, and require high energy input. With body-worn devices that make direct contact with the user, such as a watch, a pager, or a watch-pager combination, the technology exists to provide a tactile alert that can be produced in a low volume, low profile package applicable to even watches.

PERMANENT MAGNET

OUTER CASE

ELECTROMAGNET

BODY SIDE SEALED PERMANENT FLEXIBLE

CASE CHAMBER MAGNET MEMBRANE

0 Motorola, Inc. 1990 46

[This page contains 14 pictures or other non-text objects]

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MOTOROLA Technical Developments Volume 11 October 1990

   A permanent magnet is suspended in the center of a flexible membrane that rests against the user's body and seals the vibration chamber from contamination. Alternating activation of the electromagnet above the permanent magnet attracts and repels the permanent magnet causing it and the membrane to vibrate against the user's body. The sealing of the air inside the chamber also acts to dampen the impact of the two magnets on the attract cycle and adds to the outward force on the repel cycle through the potential energy stored by the co...