Trigger Signal Device with Magnetic Field Attenuation

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Solution Overview

Problem

Conventional trigger signal generating devices for managing moving objects require large coil installations, making them difficult to integrate and install, especially in confined spaces, due to the limited detection range and directional dependency of magnetic fields.

Innovation Solution

A compact trigger signal generating device is designed with two facing trigger coils and a magnetic field attenuating material to create a large detection area, allowing the ID tag to detect signals from one coil while ignoring the other, by adjusting the magnetic field intensity distribution.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of moving object

If large trigger coils are used to create a sufficient detection area, then the detection area is large enough, but the device size becomes large and installation becomes difficult

Engineering Contradiction:

Improvedetection areaVSAvoiddevice size

Core Design Contradiction:

Area of moving objectVSVolume of moving object

Solution Approach 1:

The patent combines multiple trigger coils (first trigger coil and second trigger coil) into a single integrated device. The coils are arranged to face each other with their opening surfaces opposing, creating a merged structure that produces a combined magnetic field detection area larger than individual coils could achieve alone, while maintaining a compact overall device volume.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent utilizes three-dimensional spatial arrangement by positioning trigger coils at different locations (front surface and rear surface) facing each other. This dimensional configuration allows the magnetic fields to interact in space, creating an extended detection volume that exceeds the physical footprint of the device itself.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Volume of moving object

If trigger coils are placed close together to reduce device size, then the device becomes compact, but magnetic field interference between coils increases

Engineering Contradiction:

Improvedevice sizeVSAvoidmagnetic field interference

Core Design Contradiction:

Volume of moving objectVSObject-generated harmful factors

Solution Approach 1:

The patent introduces a magnetic field attenuating material positioned between the first and second trigger coils. This intermediary material selectively attenuates the magnetic field from one coil in the direction of the other coil, reducing mutual interference while preserving the individual detection capabilities of each coil within the compact integrated structure.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The magnetic field attenuating material is strategically positioned only in specific regions between the coils where interference occurs, rather than uniformly throughout the device. This localized application of field attenuation preserves the magnetic field integrity in detection regions while eliminating interference in overlapping regions.

Inventive Principle:

Principle #3Local quality

3Device complexity

If conventional single coil configuration is used, then the structure is simple, but the detection area is limited and directional dependency exists

Engineering Contradiction:

Improvestructure simplicityVSAvoiddetection area

Core Design Contradiction:

Device complexityVSArea of moving object

Solution Approach 1:

The patent merges multiple trigger coils into a single integrated device with the coils arranged to face each other. This combination creates a detection system where the effective detection area is the sum of individual coil detection areas, enabling detection of objects approaching from multiple directions simultaneously, thereby eliminating the directional dependency of single-coil systems.

Inventive Principle:

Principle #5Merging (Combining)

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 configuration enables a compact device with a larger detection area, allowing for easier installation and reduced size without affecting the accuracy of moving object direction detection.

Implementation Method 1

first and second trigger coils placed so as to face each other at a predetermined separation distance and each having predetermined magnetic field intensity distribution

Methodology Applied

Scientific EffectMagnetic field generation: Electromagnetic Induction

Implementation Method 2

attenuating means for attenuating intensity of a magnetic field generated by the first and second trigger coils to a predetermined level

Methodology Applied

Scientific EffectMagnetic field attenuation: Absorption (EM radiation)

Data Source

PatentUS9022297B2Trigger signal generating device and moving object management system

Publication Date: 2015.05.05 MATRIX INC

AI summary

A trigger signal generating device outputs a trigger signal activating an IC tag. The trigger signal generating device includes first and second trigger coils placed at a predetermined separation distance and each having predetermined magnetic field intensity distribution. Each of the first and second trigger coils includes attenuating means for attenuating intensity of a magnetic field generated by the first and second trigger coils to a predetermined level that allows the ID tag to detect trigger IDs of the first and second trigger coils on a side on which the first and second trigger coils are provided, and that does not allow the ID tag to detect the trigger ID of the first trigger coil on an opposite side to the side on which the first and second trigger coils are provided.