Electret Material Processing for Lower Charge Leakage

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Solution Overview

Problem

Existing methods for manufacturing electret materials face challenges in reducing charge leakage due to defects caused by ion implantation, which are not effectively addressed by heat treatments.

Innovation Solution

A method involving ion implantation into an insulator, followed by a heat treatment to reduce defects, and a charging step to stabilize the charge, with the option of forming an insulating protective film to further enhance charge retention.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If ion implantation is performed to charge the insulator, then the electret material can retain charge, but defects are caused that lead to charge leakage

Engineering Contradiction:

Improvecharge retentionVSAvoidcharge leakage due to defects

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary action by performing heat treatment immediately after ion implantation to repair defects before charge leakage can occur. The heat treatment is conducted at a temperature of 100°C to 600°C to activate defect repair mechanisms while maintaining the implanted charge, thereby preventing the harmful effect of charge leakage that would otherwise result from the ion implantation process.

Inventive Principle:

Principle #10Preliminary action

2Manufacturing precision

If heat treatment is performed to reduce defects, then defect density decreases, but charge leakage still occurs due to already implanted ions

Engineering Contradiction:

Improvedefect reductionVSAvoidcharge leakage

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The patent applies parameter changes by optimizing the temperature range of heat treatment to 100°C to 600°C. This specific temperature range enables effective defect repair through thermal activation while preventing excessive charge loss. The parameter optimization ensures that the heat treatment reduces defect density without causing significant charge leakage, resolving the contradiction between defect reduction and charge retention.

Inventive Principle:

Principle #35Parameter changes

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 method effectively reduces charge leakage in electret materials by addressing defects and stabilizing charge through a combination of ion implantation, heat treatment, and charging, while also providing an additional layer of protection with an insulating film.

Implementation Method 1

an ion implantation step of implanting ions into an insulator

Methodology Applied

Scientific EffectIon implantation: Ion Implantation

Implementation Method 2

a heat treatment step of, after the ion implantation step, performing a heat treatment on the insulator by supplying energy from outside

Methodology Applied

Scientific EffectHeat treatment: Heat Treatment

Data Source

PatentUS20250075310A1Method for manufacturing electret material

Publication Date: 2025.03.06 TOYOTA JIDOSHA KK

AI summary

A method for manufacturing an electret material includes: an ion implantation step of implanting ions into an insulator; a heat treatment step of, after the ion implantation step, performing a heat treatment on the insulator by supplying energy from the outside; and a charging step of charging the ions in the insulator after the heat treatment step.