Tamper-Resistant Access Reader Using Accelerometer Tilting Detection

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Solution Overview

Problem

Conventional access control readers are vulnerable to vandalism and hacking, as existing detection devices can be easily circumvented, and they fail to detect complete removal of the casing without opening it, due to mechanical, optical, or magnetic sensor limitations.

Innovation Solution

An access control reader design that incorporates complementary guiding means, such as notches and pins, or guide rails and bearing elements, to enforce a tilting motion and inclination of the facade, combined with an accelerometer or gyroscope for reliable detection of the opening or removal of the casing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional detection devices (mechanical switch, optical sensor, magnetic sensor) are used, then the detection function is provided, but the detection can be easily circumvented by inserting blades or magnets to simulate closed configuration

Engineering Contradiction:

Improvedetection reliabilityVSAvoidvulnerability to tampering

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent replaces conventional mechanical switches, optical sensors, and magnetic sensors with an accelerometer-based detection system. The accelerometer detects the tilting motion and inclination angle of the facade during opening, providing a more reliable and tamper-resistant detection method that cannot be easily circumvented by inserting blades or magnets.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the detection parameter from static contact presence (mechanical switch), light reflection (optical sensor), or magnetic field (magnetic sensor) to dynamic motion parameters including tilting motion detection and inclination angle measurement. This parameter change makes the detection system immune to static tampering attempts.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If conventional detection devices are used, then opening detection is provided, but complete pull-off of the casing cannot be detected

Engineering Contradiction:

Improvedetection completenessVSAvoiddetection coverage

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The accelerometer-based detection system provides multi-functional detection capability, detecting both partial opening (tilting motion) and complete pull-off (acceleration and inclination changes) of the casing. This universal detection approach covers all opening scenarios that conventional single-function sensors cannot detect.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If optical sensor or magnetic sensor is used, then detection function is provided, but mounting complexity increases due to centering requirements

Engineering Contradiction:

Improvedetection accuracyVSAvoidmounting simplicity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent replaces optical and magnetic sensors that require precise centering and alignment during mounting with an accelerometer-based system. The accelerometer detects motion and inclination regardless of its position on the facade, eliminating the complex centering requirements and simplifying the mounting process while maintaining high detection accuracy.

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

Ensures tamper-proof detection of the casing opening and complete pull-off, preventing false alarms and ensuring secure operation by mandating a specific motion that cannot be simulated by external means, while allowing detection of acceleration and inclination during removal.

Implementation Method 1

the detection device includes an accelerometer, in particular a three-dimensional type accelerometer

Methodology Applied

Scientific EffectAcceleration detection: Accelerometer

Implementation Method 2

Alternatively or complementarily, the detection device includes a gyroscope

Methodology Applied

Scientific EffectGyroscopic effect: Gyroscope

Data Source

PatentUS10091895B2Access control reader with an opening detection device

Publication Date: 2018.10.02 SYSTEMES ET TECHNOLOGIES IDENTIFICATION (STID)

AI summary

An access control reader includes a housing incorporating a base having a main wall designed to be secured to a support and a front part mounted on the base; a device detects opening of the housing. The reader is characterized in that the base and the front part include complementary guide components shaped so as to guide the front part in a tilting movement relative to the base when the housing is opened, from a closed configuration in which the front part is secured and folded down onto the base into an open configuration in which the front part is spaced apart from the base and is inclined relative to the main wall at a predefined angle which is not zero. The detection device is mounted on the front part in order to detect the tilting movement thereof.