Anti-Tampering Alarm Peripheral Using Magnetic Field Detection

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Solution Overview

Problem

Existing alarm systems lack an efficient and cost-effective anti-tampering mechanism that can detect unauthorized removal or displacement of devices without relying on mechanical switches, which complicates design and manufacturing and may allow dust ingress.

Innovation Solution

An alarm peripheral unit with a tamper detection element and housing that uses a mechanical element to change positions upon mounting and removal, utilizing non-contacting means like magnet sensors or optical coupling to generate an alarm signal, eliminating the need for mechanical switches and allowing for easy mounting and re-mounting without part replacement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If mechanical switches are used for anti-tampering detection, then the device can detect unauthorized removal, but the design and manufacturing complexity increases

Engineering Contradiction:

Improveanti-tampering detection capabilityVSAvoiddesign and manufacturing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces mechanical switches with a magnetic field-based detection system. A magnet is attached to the mounting surface, and a magnetic sensor inside the device detects the presence or absence of the magnet. When the device is removed from the mounting surface, the magnet moves away, causing the magnetic field at the sensor to change and triggering an alarm. This substitution eliminates mechanical contact points, reducing design and manufacturing complexity while maintaining reliable anti-tampering detection.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If mechanical switches are used for anti-tampering detection, then tampering can be detected, but dust ingress may affect device functioning

Engineering Contradiction:

Improvetamper detection capabilityVSAvoiddust ingress

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

By replacing mechanical switches with a magnetic field-based detection system, the patent eliminates openings or gaps that would allow dust ingress. The magnetic sensor and magnet operate through non-contact means, allowing the device housing to remain sealed and protecting internal components from dust contamination while maintaining tamper detection capability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If mechanical switches are used in the device, then anti-tampering function is achieved, but production and assembly costs increase

Engineering Contradiction:

Improveanti-tampering functionVSAvoidproduction and assembly cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The magnetic field-based detection system uses simple components (a magnet and a magnetic sensor) that are inexpensive to manufacture and assemble. The magnet can be attached to the mounting surface using standard adhesives or mounting methods, and the magnetic sensor can be integrated into the device circuit board using standard SMT processes. This eliminates the need for precision-machined mechanical switches, reducing production and assembly costs while maintaining the anti-tampering function.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Reliability

If mechanical switches are used, then tamper detection is possible, but the device requires replacement of all parts upon removal

Engineering Contradiction:

Improvetamper detectionVSAvoidre-mountability

Core Design Contradiction:

ReliabilityVSEase of repair

Solution Approach 1:

The magnetic field-based detection system allows the device to be removed and re-mounted multiple times without requiring replacement of mechanical components. The magnet remains attached to the mounting surface, and when the device is re-mounted, the magnetic sensor again detects the magnet's presence, restoring the anti-tampering function. This eliminates the need to replace mechanical switches or other wear-prone components upon removal and re-installation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This solution simplifies manufacturing, reduces costs, and prevents dust ingress while effectively detecting tampering attempts, providing a reliable and cost-efficient anti-tampering arrangement for various electronic devices.

Implementation Method 1

Movements of he tamper detection element are detected by a magnet sensor

Methodology Applied

Scientific EffectMagnetic field detection: Magnetic Field

Implementation Method 2

Movements of he tamper detection element are detected by a magnet sensor, optical means and other non-contacting means

Methodology Applied

Scientific EffectOptical detection: Light

Data Source

PatentEP3499479B1An alarm peripheral with an Anti-tampering arrangement and an Anti-tampering arrangement

Publication Date: 2021.05.26 VERISURE SARL

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AI summary

An alarm peripheral (10) comprising a tamper detection element (18) and a housing (12) arranged to be mounted on a surface, the tamper detection element (18) being biased towards a first position and arranged to be displaced away from the first position when the housing (12) is mounted on the surface, the peripheral being arranged to generate an alarm signal in response to the detection of the movement of the tamper detection element towards the first position when the peripheral is removed from the surface.