3D Pressure-Sensitive Sheet for Reliable Object Placement Sensing

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Solution Overview

Problem

Conventional pressure-sensitive conductive sheets face challenges in reliability and cost when used for object placement sensing, particularly on 3D surfaces, due to issues with the interface layer and inconsistent readings caused by non-flat item bottoms.

Innovation Solution

A stretchable pressure-sensitive conductive sheet system with a 3D structure featuring depressions and conductive material applied to interlocking fibers, which changes electrical resistance upon pressure application, allowing for accurate object detection through a conductive grid pattern and support sheet.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional pressure-sensitive conductive sheets with three layers are used for object placement sensing, then object detection capability is achieved, but cost increases and reliability deteriorates due to interface layer issues

Engineering Contradiction:

Improvereliability of pressure-sensitive conductive sheet layer interfaceVSAvoidthree-layer structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent removes the top conductive sheet layer from the conventional three-layer structure, retaining only the bottom conductive sheet and the pressure-sensitive conductive sheet. This extraction simplifies the structure while maintaining the essential pressure sensing function, thereby improving reliability by eliminating interface issues between the top and middle layers.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent combines the functions of the top conductive sheet and bottom conductive sheet into a single bottom conductive sheet that serves as both the structural support and the electrical sensing element. This merging reduces the number of layers and interfaces, simplifying the overall structure and improving reliability.

Inventive Principle:

Principle #5Merging (Combining)

2Measurement precision

If pressure-sensitive conductive sheets are used on 3D surfaces, then object placement monitoring is enabled, but measurement precision deteriorates due to non-flat item bottoms

Engineering Contradiction:

Improveaccuracy of object placement detectionVSAvoidadaptability to 3D surfaces and various object shapes

Core Design Contradiction:

Measurement precisionVSAdaptability or versatility

Solution Approach 1:

The patent employs a stretchable fabric with a 3D structure that can conform to curved and non-planar surfaces. The fabric's elastic properties allow it to adapt to various object shapes and 3D surface geometries, maintaining consistent contact and measurement precision regardless of surface flatness.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The patent utilizes changes in electrical resistance parameters of the conductive material in response to mechanical pressure. When an object is placed on the fabric, the pressure alters the resistance values, providing precise measurement data that works effectively on both flat and 3D surfaces.

Inventive Principle:

Principle #35Parameter changes

3Measurement precision

If stretchable fabric with conductive material is used, then sensitivity to pressure changes improves, but manufacturing precision requirements increase

Engineering Contradiction:

Improvesensitivity of pressure detectionVSAvoidprecision of conductive material positioning on fabric

Core Design Contradiction:

Measurement precisionVSManufacturing precision

Solution Approach 1:

The patent uses a stretchable fabric as a flexible substrate that can accommodate variations in manufacturing tolerances. The fabric's elasticity allows for some degree of dimensional variation while maintaining functional performance, reducing the stringency of manufacturing precision requirements compared to rigid substrates.

Inventive Principle:

Principle #30Flexible shells and thin films

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

The system provides reliable and cost-effective object placement monitoring by accurately measuring changes in electrical resistance, enhancing sensitivity and durability with the use of a conductive ink and support layer, suitable for various object shapes and sizes.

Implementation Method 1

pressure-sensitive conductive sheets are materials in which the electrical resistance is altered with the application of pressure against the materials

Methodology Applied

Scientific EffectPressure-sensitive conductive effect: Piezoresistive Effect

Implementation Method 2

a conductive material positioned on a plurality of adjoining fibers of the stretchable fabric

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS12056994B2Systems and methods for improved object placement sensing for point-of-purchase sales

Publication Date: 2024.08.06 GENESEE VALLEY INNOVATIONS LLC

AI summary

Systems and methods are provided for monitoring object placement on a surface. The system includes a pressure-sensitive conductive sheet. The pressure-sensitive conductive sheet includes a stretchable fabric, having a plurality of fibers, and a conductive material positioned on a plurality of adjoining fibers of the stretchable fabric. The system further includes a 3-dimensional structure positioned under the pressure-sensitive conductive sheet. The 3-dimensional structure includes one or more depressions onto which the stretchable fabric can be stretched and the conductive material is positioned over the one or more depressions.