Linear Luminaire Assembly Using Ultrasonic-Welded Plastic Optics
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Solution Overview
Problem
Existing linear luminaires face issues with varying LED module thicknesses leading to assembly gaps and component stress, compromising IP ratings and requiring complex manual assembly, especially in automated production.
Innovation Solution
The use of plastic mounting brackets and optics connected via ultrasonic welding, along with a housingless driver design and modular device carriers, allows for assembly in a single direction without rotation, ensuring airtightness and ease of production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If traditional mounting brackets and assembly methods are used, then assembly flexibility is maintained, but assembly complexity increases and automation becomes difficult
Solution Approach 1:
The luminaire is divided into modular components (mounting bracket, LED module, optics, driver) that can be independently manufactured and assembled. The mounting bracket is segmented with specific engagement features that simplify the assembly process and enable automated assembly lines.
Solution Approach 2:
Traditional mechanical fastening systems (screws, clips, multiple fasteners) are replaced with a snap-fit engagement system where the mounting bracket directly engages with the LED module mounting plate through complementary geometric features, eliminating the need for additional fasteners and simplifying assembly.
2Adaptability or versatility
If LED modules of varying thicknesses are used, then adaptability improves, but assembly gaps and component stress occur
Solution Approach 1:
The mounting bracket is designed with localized engagement features at specific positions that adapt to the thickness variations of LED modules. The bracket includes adjustable or compliant elements at the engagement points that maintain proper contact and sealing regardless of the LED module thickness, ensuring consistent IP rating protection.
Solution Approach 2:
The mounting bracket incorporates design parameters that allow it to accommodate a range of LED module thicknesses. This includes variable thickness sections, compliant mounting surfaces, or adjustable engagement mechanisms that adapt to different LED module dimensions while maintaining proper sealing and structural integrity.
3Reliability
If multiple fasteners and sealing components are used, then airtightness is ensured, but aesthetic appeal and manufacturing simplicity decrease
Solution Approach 1:
The mounting bracket integrates multiple functions into a single component: structural support, mechanical fastening, and sealing. The bracket itself forms the sealing barrier between the LED module and the luminaire housing, eliminating the need for separate gaskets or sealing components while maintaining IP rating protection.
Solution Approach 2:
Traditional separate fasteners (screws, clips) and sealing components (gaskets, seals) are extracted from the assembly and their functions are integrated into the mounting bracket itself. The bracket includes built-in engagement features and sealing surfaces that perform both fastening and sealing functions without requiring additional parts.
4Ease of operation
If visible fasteners are used, then assembly simplicity is maintained, but aesthetic appeal deteriorates
Solution Approach 1:
The fastening function is merged into the mounting bracket structure itself through snap-fit engagement features. The bracket engages with the LED module and luminaire housing through integrated geometric features that are hidden within the structure, providing secure fastening without visible external fasteners, thus maintaining both assembly simplicity and aesthetic appeal.
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 design achieves high IP ratings, simplifies manufacturing, reduces assembly complexity, and enhances aesthetic appeal by eliminating visible fasteners, while accommodating LED modules of varying thicknesses and enabling easy component replacement.
Implementation Method 1
The mounting bracket and the optics are made of plastic or are substantially formed from it, and a material-bonded connection between the two components is realized at a connection point provided between these two components
Data Source
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AI summary
The invention relates to a linear luminaire, in particular a continuous-row luminaire, designed for mounting on a support rail connected to a building structure for receiving wiring, comprising a gear tray 12 detachably connectable to the support rail, which is designed for arranging at least one LED module 14 for generating a luminous flux radiating in a direct direction and electrical and/or electronic components, and an optic 18 arranged in the direct direction in front of the at least one LED module 14, designed for directing the luminous flux to achieve a visual task to be accomplished with the continuous-row luminaire. To simplify assembly and reduce throughput times, the invention proposes that the gear tray 12 and the optic 18 comprise plastic and are bonded together at a connection point.