Browse Prior Art Database

MULTI-POSITION RING SWITCH

IP.com Disclosure Number: IPCOM000008458D
Original Publication Date: 1997-Dec-01
Included in the Prior Art Database: 2002-Jun-17
Document File: 1 page(s) / 45K

Publishing Venue

Motorola

Related People

Joseph Namm: AUTHOR

Abstract

This device is composed of two rings (or cups), one fitting loosely in the other, A bushing (or boot) attaches one ring to the other such that the inner ring can float within the outer ring. The contigura- tion of the inner ring enables a person's finger to be inserted. One implementation has individual momentary switches along the inside of the outer ring so that when the inner ring is pressed against the outer ring one of the switches is activated. Each switch would thus be associated with one position of the device.

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MOTOROLA Technical Developments

MULTI-POSITION RING SWITCH

by Joseph Namm

  This device is composed of two rings (or cups), one fitting loosely in the other, A bushing (or boot) attaches one ring to the other such that the inner ring can float within the outer ring. The contigura- tion of the inner ring enables a person's finger to be inserted. One implementation has individual momentary switches along the inside of the outer ring so that when the inner ring is pressed against the outer ring one of the switches is activated. Each switch would thus be associated with one position of the device.

Another implementation has two parallel semi-conductive/resistive traces along the inside

circumference of the outer ring. These traces are not continuous and are connected to a conductor at one end. The outer surface of the inner ring is conduc- tive. When the inner ring is pressed against the outer ring, the resistive traces are shorted resulting in a resistance across the conductors relative to the radial in which the inner ring touched the outer ring (see figure below). For example, contacting the outer ring at the 0" radial would result in a resis- tance of (O/360) * (total resistance of the traces), a contact at the 135" radial as shown below would result in a resistance of (135/360) * (the total resis- tance of the traces).

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125

December I997

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