Browse Prior Art Database

TILT AND MOVEMENT DETECTOR

IP.com Disclosure Number: IPCOM000007316D
Original Publication Date: 1994-Oct-01
Included in the Prior Art Database: 2002-Mar-14
Document File: 2 page(s) / 98K

Publishing Venue

Motorola

Related People

Stephen E. Baulcomb: AUTHOR

Abstract

Present Tilt and movement sensors are used in a wide variety of applications. From Military uses, i.e. movement sensors used in anti personal devices to equipment sledges which automatically release parachutes on landing.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 50% of the total text.

Page 1 of 2

MOTOROLA Technical Developments Volume 23 October 1994

TILT AND MOVEMENT DETECTOR

by Stephen E. Baulcomb

Present Tilt and movement sensors are used in a wide variety of applications. From Military uses,
i.e. movement sensors used in anti personal devices to equipment sledges which automatically release parachutes on landing.

  In the civilian market, tilt and movement sen- sors are used as anti-thief devices, i.e. if an object has anti movement tilt and movement electronics fitted and if the equipment is moved, an alarm is automatically generated.

The Present Tilt and movement sensors in use generally use mercury as a fluid and conductive

medium, this leads to a number of drawbacks.

i) Environmental use ofmercury.

ii) Accuracy of the tilt angle, caused by the tilt angle the equipment has moved through. This is caused by the viscosity of the Mercury,

i.e. the contacts within the sensor 'bounce; usually giving an output an oscillating out- put, ofindeterminate stated
iii) Mercury movement sensors, are limited in the angles in which they can perform from the vertical.

iv) Mercury tilt switches do not have consist/ omni directional detection, due to construc- tion and the use of the sensor and the physi- cal properties of mercury

  In the broadest sense, the invention can be either a tilt or movement sensor, using light and a opaque liquid which gives rise to the benefit ofhigher accu- racy of the tilt angle, omni- or uni detection of move-

ment, environmentally acceptable.

Diagrams which show the operation of the tilt and Movement sensor.

Clear Plastic

/

Outer Housing,

(Opaque)

Liquid

(Opaque)

ODtical

I

Controlling Electronics

Figure 1

0 M010r01a. 1°C. 1994 127

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

Page 2 of 2

MOTOROLA Technical Developments Volume 23 October 1994

Clear

Plastic

,

Outer Housing

(Opaque)

Optical 4

Rkceiver

Liquid

(OpaqW

Figure 2

  A sensor built as shown in Figure 1...