Textile Sensor Array for Plush Toy Interaction Detection

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Solution Overview

Problem

Current smart toys face challenges in incorporating sensing elements without compromising their soft feel, leading to inadequate detection of children's interactions due to rigid sensors and limited spatial sensing coverage.

Innovation Solution

The integration of an array of textile-based pressure sensors beneath the outer fabric layer of plush toys, combined with optimized hardware and machine learning models for efficient data processing and energy management, enabling robust interaction detection while maintaining a natural feel.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If rigid sensors are placed near the surface of the plush toy, then interaction detection capability is improved, but the soft feel and touch of the toy deteriorates

Engineering Contradiction:

Improveinteraction detection capabilityVSAvoidsoft feel and touch

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The patent applies flexible sensors that can be integrated into the plush toy's fabric layers, allowing the toy to maintain its soft and squishy characteristics while enabling interaction detection. The flexible nature of these sensors eliminates the need for rigid surface-mounted components, resolving the contradiction between detection capability and tactile comfort.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The patent changes the physical state and material properties of the sensors from rigid to flexible, enabling them to conform to the plush toy's soft structure. This parameter change allows the sensors to function effectively within the soft fabric layers without compromising the toy's overall softness and appeal to children.

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If a small number of sensors are placed in the toy, then the soft feel is maintained, but the spatial sensing coverage and fine-grained interaction measurement deteriorates

Engineering Contradiction:

Improvesoft feelVSAvoidspatial sensing coverage

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent divides the sensing system into multiple distributed flexible sensors embedded throughout the plush toy's fabric layers. This segmentation allows for dense spatial sensing coverage across different locations of the toy while maintaining the soft feel, as each sensor is small and flexible rather than relying on a few large rigid sensors.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent transitions from surface-level sensing to volumetric sensing by embedding flexible sensors within the fabric layers of the plush toy. This dimensional change enables comprehensive spatial coverage throughout the toy's structure while preserving the external soft appearance and tactile properties.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Device complexity

If binary pressure detection is used, then device complexity is reduced, but the ability to detect and classify fine-grained interactions deteriorates

Engineering Contradiction:

Improvesensing system complexityVSAvoidinteraction detection accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent replaces simple binary pressure switches with flexible sensor arrays that provide continuous analog pressure measurements. This substitution enables fine-grained interaction detection while managing complexity through the use of integrated flexible sensing elements that can be embedded in the fabric without requiring complex mechanical structures.

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 allows for accurate, fine-grained interaction detection across the plush toy's surface, improving the ability to classify interactions with high accuracy and reducing power consumption, thus enhancing the usability and appeal of smart toys for children.

Implementation Method 1

Each sensor can include an inner textile layer sandwiched between two outer conductive textile layers. The inner textile layer can include a perfluorosilane coating. The sensors operate by detecting pressure-induced changes in electrical resistance through the textile layers.

Methodology Applied

Scientific EffectPiezoresistive effect: Piezoresistive Effect

Data Source

PatentUS20230381677A1Plush toy with array of textile-based sensors for interaction detection

Publication Date: 2023.11.30 UNIV OF MASSACHUSETTS

AI summary

A plush toy system comprises a plush toy body with an outer fabric layer, wherein the outer fabric layer forms an interactive surface engageable by a user, an array of textile-based pressure sensors coupled to the plush toy body proximate to the outer fabric layer, and sensor conditioning circuits coupled to the plush toy, the sensor conditioning circuits being configured to interpret signals from the textile-based pressure sensors to identify interaction between the user and the interactive surface.