Trimmed Resistor Protective Coating for Moisture-Stable Resistance
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Solution Overview
Problem
Existing electronic components, such as resistors, experience significant changes in characteristics due to moisture absorption, particularly in the trimming grooves where resin layers are used, leading to resistance value fluctuations.
Innovation Solution
The use of an insulating protective layer containing a cured product of polysilsesquioxane, which has low hygroscopicity, is applied to cover the element part and fill the trimming grooves, reducing moisture exposure and maintaining resistance values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resin layer is used to fill the trimming groove, then the element part is covered and protected, but the resin layer absorbs moisture causing changes in resistance values
Solution Approach 1:
The patent changes the material parameter of the insulating protective layer from conventional resin to polysilsesquioxane coating. This material substitution fundamentally alters the hygroscopic properties, reducing moisture absorption and stabilizing resistance values under humid conditions.
Solution Approach 2:
The patent uses a composite structure where the polysilsesquioxane coating is applied over the resin layer in the trimming groove. This composite approach combines the protective coverage of resin with the low-hygroscopicity properties of polysilsesquioxane, achieving both coverage and moisture resistance.
2Object-affected harmful factors
If an insulating protective layer with low hygroscopicity is used, then moisture absorption is reduced, but the manufacturing process becomes more complex
Solution Approach 1:
The insulating protective layer is segmented into two functional parts: the base resin layer providing coverage and the polysilsesquioxane coating providing moisture resistance. This segmentation allows each layer to perform its specific function optimally while maintaining overall simplicity.
Solution Approach 2:
The polysilsesquioxane coating is applied as a preliminary protective layer before final inspection. This preliminary action ensures moisture resistance is built into the structure during manufacturing, preventing later degradation without requiring complex post-processing.
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 polysilsesquioxane-based protective layer effectively minimizes moisture-induced changes in resistance values by providing a barrier that is less susceptible to moisture absorption, thus stabilizing the electronic component's characteristics.
Implementation Method 1
The smokeless coating material is formed by mixing an organosilsesquioxane of a trifunctional unit and a silicate of a tetrafunctional unit to form silanol, and condensing the silanol
Implementation Method 2
the body of the resistor is subjected to a heat treatment at a temperature of 100° C. to 200° C. in a vacuum furnace to volatilize the organic component of the coating material
Data Source
AI summary
Provided is an electronic component having a small change in characteristics due to moisture. Electronic component includes substrate, element part, and insulating protective layer. Element part is formed on substrate. Insulating protective layer covers element part. Element part includes trimming groove. Insulating protective layer includes cover part containing a cured product of polysilsesquioxane. Cover part includes surface cover layer covering a surface of element part and filling part filled in trimming groove.