Pressure-Sensitive Sheet Resistive Grid Weight Detection

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Solution Overview

Problem

Standard commercial pressure-sensitive conductive sheets have limitations in detecting multiple heavy items due to their narrow weight detection range and inability to determine the quantity and location of items on a Point-of-Purchase display shelf.

Innovation Solution

A pressure-sensitive conductive sheet with a resistive grid formed from an electrically non-conductive polymer, embedded in the pressure-sensitive sheet layer, which increases the baseline resistance and allows for more accurate detection of object placement and weight distribution.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If standard commercial pressure-sensitive conductive sheets are used, then the sheets are inexpensive and easy to manufacture, but the weight detection range is narrow and cannot detect multiple heavy items

Engineering Contradiction:

Improveweight detection rangeVSAvoidsheet structure

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The conductive sheet is divided into multiple resistive grid patterns with different densities across the sheet surface. Each grid pattern creates distinct electrical resistance characteristics that enable differentiation between single light items and multiple heavy items, expanding the weight detection range while maintaining the basic simple sheet structure

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the conductive sheet are assigned different resistive grid densities to create localized sensing zones with unique electrical characteristics. This allows the sheet to distinguish between items based on their weight distribution and position, improving measurement precision without requiring a completely complex redesign

Inventive Principle:

Principle #3Local quality

2Loss of information

If standard commercial pressure-sensitive conductive sheets are used, then the sheets are simple in structure, but the ability to determine quantity and location of items is lost

Engineering Contradiction:

Improveitem quantity and location informationVSAvoidresistive grid structure

Core Design Contradiction:

Loss of informationVSDevice complexity

Solution Approach 1:

The sheet is segmented into multiple resistive grid patterns with different densities, creating distinct electrical signatures for different regions. When items are placed on the sheet, the resistance changes in specific grid regions provide information about item quantity and location, reducing information loss without excessive complexity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The resistive grid patterns act as intermediaries between the physical placement of items and the electrical signal. The grids translate mechanical pressure and position information into distinct resistance patterns, enabling extraction of quantity and location data from the electrical response

Inventive Principle:

Principle #24Intermediary (Mediator)

3Measurement precision

If the resistive grid increases baseline resistance, then the weight detection range expands, but the electrical conductivity of the sheet decreases

Engineering Contradiction:

Improveweight detection rangeVSAvoidelectrical conductivity

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The resistive grid patterns modify the electrical parameters of the conductive sheet by introducing controlled resistance variations. These parameter changes create distinct resistance signatures that enable weight detection while the overall sheet maintains sufficient conductivity for functional operation

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The conductive sheet combines the base conductive material with resistive grid patterns formed from different materials or structures. This composite approach allows the sheet to exhibit both adequate overall conductivity and localized resistance variations for weight detection

Inventive Principle:

Principle #40Composite materials

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 modified pressure-sensitive conductive sheet with a resistive grid enhances the weight detection range, enabling the detection of multiple heavy items and determining their location, thus improving the sensing performance and analysis capabilities.

Implementation Method 1

the pressure-sensitive sheet layer exhibits a decrease in electrical resistance with the application of pressure

Methodology Applied

Scientific EffectPressure-sensitive conductive effect: Piezoresistive Effect

Implementation Method 2

the resistive grid is configured to increase a baseline resistance of the pressure-sensitive conductive sheet in response to application of pressure against the pressure-sensitive conductive sheet

Methodology Applied

Scientific EffectResistive grid pressure response: Piezoresistive Effect

Data Source

PatentUS12216011B2Systems and methods for improved sensing performance of pressure-sensitive conductive sheets

Publication Date: 2025.02.04 GENESEE VALLEY INNOVATIONS LLC

AI summary

Systems and methods for detecting item placement on a surface are provided. The system includes a pressure-sensitive conductive sheet and a resistive grid connected to the pressure-sensitive conductive sheet. The resistive grid includes an electrically non-conductive polymer. The resistive grid includes one or more lines arranged in a pattern. The lines may include parallel lines, parallel and perpendicular lines, concentric circles, arcs of expanding radius, and/or any other suitable types of lines and/or any combination thereof. The resistive grid may include one or more distinct lines and/or shapes positioned at various points along the pressure-sensitive sheet layer.