Light Emitting Device Optical Member Adhesion and Pressing
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Solution Overview
Problem
Conventional light emitting devices face issues with separation and positional shifting of optical members due to loss of adhesion between the optical and cover members, particularly under high temperature conditions, leading to failures in achieving desired optical characteristics.
Innovation Solution
A light emitting device design that includes a base, frame, semiconductor laser elements, a cover member, an optical member, and a pressing member, where the optical member is fixed to the cover member via an adhesive member with strategically placed first and second adhesive portions, and a pressing member that presses the optical member to the frame to inhibit detachment and lateral shifting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the optical member is fixed to the cover member via an ultraviolet curable adhesive member, then the optical member can be positioned on the cover member, but the adhesion may be lost due to breaking or separation of the adhesive member under high temperature conditions, leading to detachment or positional shifting of the optical member
Solution Approach 1:
The adhesive member is divided into multiple discrete adhesive portions (first adhesive portions and second adhesive portions) rather than using a single continuous adhesive layer. The first adhesive portions are positioned at specific locations between the optical member and cover member, while the second adhesive portions are positioned at different locations to provide redundant attachment points. This segmentation ensures that if some adhesive portions fail under thermal stress, other portions remain intact to maintain the optical member's position and prevent complete detachment or significant positional shifting.
2Reliability
If a pressing member is added to press the optical member to the frame, then detachment and lateral shifting of the optical member can be inhibited, but the device complexity increases
Solution Approach 1:
The pressing member is integrated with the frame structure, combining the functions of the frame (structural support) and the pressing member (mechanical constraint) into a single unified component. This merging reduces the total number of separate parts and simplifies the overall device structure while still providing the necessary pressing force to inhibit detachment and lateral shifting of the optical member.
Solution Approach 2:
The frame is designed to serve multiple functions: it provides structural support for the device, defines the through-opening, and simultaneously acts as a pressing member through its configuration that contacts and constrains the optical member. This multi-functionality eliminates the need for a separate dedicated pressing component, thereby reducing device complexity while maintaining fixation reliability.
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 design effectively reduces detachment and positional shifting of the optical member, even when adhesion is lost, thereby maintaining desired optical characteristics and preventing failures.
Implementation Method 1
an adhesive member to allow light that passed through the cover member to pass through, wherein the adhesive member includes one or more first adhesive portions and two or more second adhesive portions
Data Source
AI summary
A light emitting device includes a base, a frame, one or more semiconductor laser elements, a cover member, an optical member fixed to the cover member via an adhesive member, and a pressing member. The adhesive member includes one or more first adhesive portion disposed between an upper surface of the cover member and a lower surface of the optical member, and two or more second adhesive portions respectively disposed at locations in contact with or spaced apart from the one or more first adhesive portions when viewed from above, in contact with the first inner lateral surface of the cover member and the lateral surface of the optical member.