Ion Generating Device Shielding Insulation
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Solution Overview
Problem
Shielding an ion generating device with a metal box to reduce electromagnetic noise results in a reduction of ion emission, as ions adhere to the metal, leading to a decrease in the amount of ions emitted.
Innovation Solution
A conductive shield case is used to cover the housing of the ion generating device, with an insulating section applied to the outer surface to prevent ions from adhering, while allowing ions to be emitted through designated ports, thereby maintaining ion emission while minimizing electromagnetic noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a metal box is used to shield the housing to reduce electromagnetic noise, then electromagnetic noise is reduced, but ion emission is reduced due to ion adhesion to the metal surface
Solution Approach 1:
The patent applies a conductive coating only to specific areas of the housing where electromagnetic shielding is needed, rather than coating the entire housing. This localized application maintains shielding effectiveness while reducing the total surface area available for ion adhesion, thus preserving ion emission quantity.
Solution Approach 2:
The patent uses a composite structure combining conductive material (for shielding) with insulating material (to prevent ion adhesion). The conductive coating is applied to the housing surface, and an insulating coating is applied over it in ion emission areas, creating a multi-layer composite structure that simultaneously provides electromagnetic shielding and prevents ion loss.
2Object-affected harmful factors
If a conductive shield case is used to cover the housing, then electromagnetic noise is reduced, but ions adhere to the shield case reducing ion emission
Solution Approach 1:
The insulating coating is applied selectively to the outer surface of the shield case only in areas where ions are emitted, rather than coating the entire shield case. This localized insulation prevents ion adhesion at critical emission points while maintaining the conductive shielding properties in other areas.
Solution Approach 2:
The insulating coating acts as an intermediary layer between the conductive shield case and the ions. This intermediate layer prevents direct contact between ions and the conductive surface, eliminating the adhesion problem while preserving the electromagnetic shielding function of the underlying conductive material.
3Object-affected harmful factors
If the entire housing is covered with conductive material, then electromagnetic shielding is maximized, but ion emission is significantly reduced due to increased ion adhesion surface
Solution Approach 1:
The patent implements selective coating where conductive material is applied only to areas requiring electromagnetic shielding, and insulating material is applied only to areas where ions are emitted. This localized differentiation optimizes both shielding effectiveness and ion emission by matching material properties to functional requirements.
Solution Approach 2:
The housing surface is segmented into different functional zones: areas requiring electromagnetic shielding are coated with conductive material, while areas requiring ion emission are coated with insulating material. This segmentation allows independent optimization of shielding and ion emission performance in different regions.
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 insulating section effectively prevents ions from adhering to the shield case, maintaining ion emission levels while reducing electromagnetic noise, ensuring effective ion distribution without ion loss.
Implementation Method 1
If the high-voltage generating circuit section 2 applies a high voltage between the discharge electrode 5 and the induction electrode 6, corona discharge occurs at a tip of the discharge electrode 5, and one or both of positive and negative ions are generated.
Implementation Method 2
an insulating section is provided on an outer surface of the shield case so that ions emitted from the emission port do not adhere to the shield case. The insulating section is an insulating film provided on an outer surface of the shield case and having an electrically insulating property
Data Source
Figure 1(a)~1(d)
Figure 2(a)~2(d)
Figure 3
AI summary
To prevent a reduction in an amount of an ion emission while preventing generation of electromagnetic noise. A high-voltage generating circuit section (2) that supplies a high voltage to an ion generating element (1) that generates ions is housed in a housing (3), and sealed with filled resin (22). An emission port (12) for emitting the generated ions is formed in the housing (3), and an outer surface of the housing (3) except the emission port (12) is covered with a shield case (30). A passage port (33) communicating with the emission port (12) is formed in the shield case (30). A periphery of the passage port (33) of the shield case (30) is covered with an electrically insulating covering sheet (36) so that emitted ions do not adhere to the shield case (30). The ions emitted from the emission port (12) do not adhere to the shield case (30) covered with the covering sheet (36).