Lightpipe Mounting Assembly Using Panel Hooks
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Solution Overview
Problem
Existing methods for attaching lightpipes to panels, such as press-fit and snap-fit assemblies, are prone to failure due to vibrations and temperature variations, and require costly and complex mold processes or additional post-processing fixtures, while adhesive solutions are difficult to use effectively.
Innovation Solution
A lightpipe mounting assembly that includes a panel with hooks extending from its periphery, allowing the lightpipe to engage and secure to the panel, enabling visibility from the front side without the need for undercuts or additional mold tools, and facilitating secure attachment without adhesives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If press-fit assembly methods are used to attach lightpipes, then the assembly process is simple, but the retention reliability deteriorates due to vibrations and temperature variations reducing frictional forces
Solution Approach 1:
The panel is segmented with multiple openings and hooks distributed across its surface, allowing the lightpipe to be secured at multiple discrete locations rather than relying on a single friction-based interface. This segmentation distributes the retention forces and prevents catastrophic failure from vibration or thermal expansion.
Solution Approach 2:
The solution transitions from a two-dimensional friction-based press-fit interface to a three-dimensional mechanical interlocking structure using hooks that extend into openings. This dimensional change creates physical engagement that resists pull-out forces from vibration and thermal cycling.
2Reliability
If snap-fit assembly methods are used to attach lightpipes, then the lightpipe can be securely retained, but the device complexity increases due to requiring undercuts formed during plastic injection molding
Solution Approach 1:
Instead of creating complex undercuts in the panel during molding to secure the lightpipe, the solution inverts the approach by having the lightpipe itself feature attachment members (hooks) that engage with simple openings in the panel. This reverses the complexity from the panel mold to the lightpipe component, simplifying the panel manufacturing process.
Solution Approach 2:
The complex undercut feature is extracted from the panel and relocated to the lightpipe as attachment members. This extraction simplifies the panel's mold process while maintaining the secure retention function through the lightpipe's own structural features.
3Reliability
If heatstaking is used to attach lightpipes, then the lightpipe can be securely retained, but additional post-processing fixtures and equipment are required
Solution Approach 1:
The lightpipe's attachment members (hooks) are designed to self-engage with the panel's openings through simple insertion and elastic deformation, eliminating the need for external heatstaking equipment or post-processing fixtures. The material's inherent elasticity provides the securing mechanism without additional tools.
Solution Approach 2:
The thermal field-based heatstaking process is replaced with a purely mechanical elastic deformation system. The flexible attachment members use elastic recovery to secure the lightpipe, substituting a complex thermal process with a simple mechanical engagement.
4Reliability
If glues or adhesives are used to secure lightpipes, then the lightpipe can be retained, but the ease of operation deteriorates due to difficulty in application and positioning
Solution Approach 1:
The chemical bonding process using adhesives is replaced with a mechanical elastic deformation system. The flexible attachment members use elastic recovery to secure the lightpipe, providing immediate mechanical retention without requiring adhesive application, curing time, or precise positioning during bonding.
Solution Approach 2:
The attachment members are pre-formed with elastic properties during lightpipe manufacturing, preparing them in advance to automatically secure the lightpipe upon insertion into the panel openings, eliminating the need for operational adhesive application and positioning steps.
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 solution provides a cost-effective and vibration-resistant method for attaching lightpipes to panels, eliminating the need for complex mold processes and adhesive use, ensuring stable light transmission and visibility.
Implementation Method 1
a flexible attachment member (66) adapted to cooperate with the at least one hook
Implementation Method 2
Lightpipes are designed to transmit light from a source (e.g., a light emitting diode on a printed circuit board) to an outlet
Data Source
AI summary
A lightpipe mounting assembly comprises a panel having at least one opening extending from a front side of the panel to a rear side of the panel. The panel also comprises at least one hook extending rearwardly from a periphery of the opening. The mounting assembly also comprises a lightpipe adapted to engage the at least one hook to secure the lightpipe to the panel to enable visibility of the lightpipe from the front side of the panel.