Optical Coupling Device Epoxy Resin Discoloration
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Solution Overview
Problem
The light transmission property of resins in photocouplers is decreased due to discoloration, which affects the signal transmission performance and requires improvement.
Innovation Solution
The use of a cured product of an epoxy resin composition containing an aromatic ring and an alicyclic compound as the internal mold resin between the light emitting and receiving elements, along with a silicone resin cured product as the potting resin, to suppress discoloration and maintain light transmission properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional epoxy resin composition is used as the internal mold resin, then the resin provides good sealing and structural properties, but the light transmission property decreases due to discoloration under high temperature conditions
Solution Approach 1:
The patent changes the chemical composition parameters of the epoxy resin by incorporating specific compounds (cyclic carbonate compound, cyclic carboxylate compound, and their derivatives) to improve thermal stability and prevent discoloration while maintaining light transmission properties under high temperature conditions
Solution Approach 2:
The patent creates a composite resin system by combining epoxy resin with specific cyclic carbonate and cyclic carboxylate compounds, forming a multi-component composition that provides both structural integrity and resistance to thermal discoloration, thereby maintaining light transmission over time
2Duration of action of stationary object
If the resin is exposed to high temperature for extended periods, then the device operates reliably, but the resin undergoes discoloration and loses light transmission property
Solution Approach 1:
The patent applies preliminary protective action by incorporating antioxidant and thermally stable compounds (cyclic carbonate and cyclic carboxylate) into the resin composition before device operation, which prevent discoloration from occurring during extended high temperature exposure and maintain light transmission throughout the device's operational lifetime
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 configuration effectively suppresses discoloration and maintains the light transmission property, enhancing the signal transmission performance and extending the device's lifespan under high temperatures.
Implementation Method 1
a cured product of a composition having an epoxy resin and a curing agent
Implementation Method 2
a light emitting element, such as a light emitting diode
Implementation Method 3
a light receiving element, such as a phototransistor
Data Source
AI summary
In order to improve properties, an optical coupling device has a potting resin and an internal mold resin between a light emitting element and a light receiving element. The internal mold resin is a cured product of a composition having an epoxy resin and a curing agent, and is a resin having a light transmission property. Additionally, the internal mold resin MRI contains an aromatic ring and an alicyclic compound. By thus lowering the ratio of an aromatic ring in the epoxy resin, deterioration of the resin can be suppressed. Thereby, a decrease in the light transmission property of the epoxy resin cured product can be suppressed, and degradation of the transmission performance for an optical signal can be reduced.