Strip Fixation Member for Narrow Frame LED Light Guide Assembly
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Solution Overview
Problem
The existing fixation members in planar illumination devices are difficult to handle and assemble due to their narrow design, which complicates the assembly process and reduces workability, especially when trying to narrow the frame of the device.
Innovation Solution
A planar illumination device with a fixation member of strip shape that is bonded to multiple regions on the light guide plate between adjacent LEDs, using ultrasonic welding to improve bonding strength and facilitate assembly, while maintaining a narrow frame design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the fixation member is narrowed to achieve a narrower frame, then the frame size is reduced, but the workability for assembly deteriorates
Solution Approach 1:
The fixation member is divided into multiple separate members positioned at different locations (first fixation member at one end, second fixation member at the other end, and third fixation member at the intermediate position). This segmentation allows each fixation member to be independently handled and assembled, improving workability while maintaining a narrow overall frame structure.
Solution Approach 2:
The third fixation member acts as an intermediary element positioned at the intermediate location between the first and second fixation members. This intermediary fixation member provides additional support and facilitates assembly by creating stable reference points, making it easier to handle the narrow frame structure during assembly operations.
2Length of stationary object
If the fixation member is narrowed to achieve a narrower frame, then the frame size is reduced, but the handling difficulty increases
Solution Approach 1:
By segmenting the fixation structure into multiple separate fixation members distributed at different positions, each individual member remains narrow (achieving the narrow frame goal) but the distributed arrangement provides multiple handling points, significantly improving overall handling ease during assembly and maintenance operations.
Solution Approach 2:
Different fixation members are positioned at specific locations (ends and intermediate positions) to provide localized support where needed. This local quality approach ensures that the narrow frame design maintains structural integrity and ease of handling at critical positions without requiring the entire fixation structure to be wide.
3Strength
If multiple fixation points are used to improve bonding strength, then the bonding strength increases, but the device complexity increases
Solution Approach 1:
The fixation structure is segmented into multiple independent fixation members positioned at different locations. Each fixation member provides localized bonding strength, and their combined effect achieves high overall bonding strength. The segmentation approach actually simplifies the structure compared to a single complex wide fixation member, as each segment can be independently manufactured and positioned.
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 solution enhances the bonding strength between the light guide plate and the frame, allows for easier assembly and reworking, and enables further frame narrowing by improving the handling and workability of the fixation member.
Implementation Method 1
using ultrasonic welding to improve bonding strength and facilitate assembly
Data Source
AI summary
A planar illumination device according to an embodiment includes a light guide plate, light sources, and a fixation member with a strip shape. The light guide plate outputs light that is incident on a side surface thereof from one principal surface among two principal surfaces thereof. The light sources face the side surface, are arrayed to be spaced apart in a longitudinal direction of the side surface, and have light-emitting surfaces that emit light that is incident on the side surface. The fixation member is arranged between the light guide plate and another member and fixes the light guide plate to the other member. The fixation member is bonded to regions on the light guide plate that are each located anteriorly between two adjacent light sources in mutually different combinations and that are located to be spaced apart in an array direction of the light sources.