Light Guiding Member Fixation Structure for Vibration Resistance
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Solution Overview
Problem
Conventional illumination apparatuses with light guiding members face detachment issues due to vibrations, as the existing fixation methods are not robust enough to secure the lens to the case or garnish.
Innovation Solution
A structure that includes a light guiding member with a flange and shaft portion, where the holder has an insertion hole for the shaft, and a fixed member is attached to the projecting shaft portion, allowing the holder to be clamped between the flange and fixed member, thereby enhancing the securement of the light guiding member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the lens is fixed by engagement between the engagement pawl and the engagement hole, then the lens can be assembled to the case, but the lens may detach due to vibration
Solution Approach 1:
The light guiding member is divided into two functional parts: a flange portion that provides a stopping surface and a shaft portion that inserts through the holder. This segmentation allows the shaft to be securely clamped between the flange and the fixed member, preventing detachment while maintaining assembly ease.
Solution Approach 2:
The fixation mechanism transitions from a single-point engagement (pawl-hole) to a multi-dimensional clamping structure. The shaft portion passes through the insertion hole in the depth dimension, and the clamping force is applied in the radial dimension between the flange and fixed member, creating a three-dimensional fixation system that resists vibration.
2Reliability
If a flange and shaft portion structure is used with clamping between flange and fixed member, then detachment is suppressed, but the structure becomes more complex
Solution Approach 1:
The flange and shaft portions are integrated as a single light guiding member component, eliminating the need for separate fixation parts. The holder structure merges the insertion hole and clamping surfaces into one piece, reducing overall part count and assembly complexity while maintaining reliable fixation.
Solution Approach 2:
The light guiding member's own flange portion serves as the stopping surface for fixation, and its shaft portion serves as the inserted member. The structure uses itself as part of the fixation mechanism, eliminating the need for additional specialized fixation components and simplifying the overall design.
Data Source
AI summary
A structure for fixing a light guiding member includes a light guiding member that guides light emitted from a light source to a prescribed position, a holder that holds the light guiding member, and a fixed member fixed to the light guiding member. The holder includes an insertion hole through which the light guiding member is inserted. The light guiding member includes a flange larger in outer geometry than the insertion hole and a shaft portion connected to the flange and inserted through the insertion hole. The fixed member is fixed to a portion of the shaft portion that projects from the insertion hole and larger in outer geometry than the insertion hole.