Optical Member Adhesion in Light-Emitting Packages Under Light Exposure
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Solution Overview
Problem
Existing light-emitting devices face challenges in maintaining stable adhesion of optical members due to degradation of adhesives under light exposure, leading to potential quality degradation and reduced device lifespan.
Innovation Solution
A light-emitting device design utilizing two types of adhesives, where a UV-curable resin (first adhesive) is used for initial bonding and positioning, and a thermosetting resin (second adhesive) with better light resistance is used for long-term stability, ensuring stable adhesion even after the first adhesive degrades.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a UV-curable resin (first adhesive) is used for initial bonding and positioning, then positioning precision and initial adhesion are improved, but light resistance and long-term adhesion stability deteriorate
Solution Approach 1:
The adhesive system is segmented into two distinct adhesives with different functions: the first adhesive (UV-curable resin) provides initial bonding and positioning precision, while the second adhesive (thermosetting resin) provides long-term light resistance. This segmentation allows each adhesive to be optimized for its specific function without compromise.
Solution Approach 2:
The patent uses a composite adhesive system combining two different resin types (UV-curable resin and thermosetting resin). Each material contributes its superior properties: the UV-curable resin offers rapid curing and precise positioning, while the thermosetting resin provides superior durability and light resistance, creating a composite solution that achieves both positioning precision and long-term reliability.
2Reliability
If a thermosetting resin (second adhesive) is used for long-term stability, then light resistance is improved, but initial bonding speed and positioning precision deteriorate
Solution Approach 1:
The first adhesive (UV-curable resin) performs the preliminary action of bonding and positioning the optical member to the package with high precision. This initial positioning is completed rapidly through UV curing, establishing the correct spatial relationship before the second adhesive is applied for long-term stability.
Solution Approach 2:
The adhesive application process is segmented into two stages: first applying the UV-curable resin for rapid positioning, then applying the thermosetting resin for durable fixation. This segmentation allows each adhesive to perform its specialized function optimally without interference from the other.
3Device complexity
If only a single adhesive is used for bonding, then device complexity is reduced, but adhesion stability under light exposure deteriorates
Solution Approach 1:
The patent changes the chemical and physical parameters of the adhesive system by introducing two adhesives with different curing mechanisms (UV-curable vs. thermosetting). This parameter change enables the system to achieve both rapid initial bonding and long-term light resistance, overcoming the limitations of a single-adhesive system.
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 use of a UV-curable resin for initial bonding and a thermosetting resin for long-term stability maintains the adhesion of the optical member to the package, ensuring the light-emitting device's performance and longevity by preventing adhesive degradation from light exposure.
Implementation Method 1
a UV-curable resin (first adhesive) is used for initial bonding and positioning
Implementation Method 2
a thermosetting resin (second adhesive) with better light resistance is used for long-term stability
Data Source
AI summary
A light-emitting device includes: a light-emitting element; a package in which the light-emitting element is arranged; an optical member fixed to the package, the optical member having a lens portion having a lens surface including a first lens, and a non-lens portion that is a portion that does not overlap the lens surface in a top view; and one or more adhesives fixing the optical member to the package. The package has an emission surface through which light from the light-emitting element exits the package. The optical member has an incidence surface on which the light exiting the package enters the optical member, and the lens surface from which the light that has entered the optical member exits the optical member.