Lighting System Spacer Guide Recesses Assembly Precision

A spacer is introduced as an intermediary component between the printed circuit board and the optical unit. The spacer includes a bearing opening that receives the light guide and guide recesses on its edge that open into the bearing opening. These guide recesses act as threading aids that prevent the light guide from becoming wedged during assembly, while the spacer itself provides precise positioning. This intermediary element resolves the contradiction by enabling both simple assembly (the optical unit can be directly mounted to the PCB via the spacer) and high positioning precision (the guide recesses ensure accurate alignment without wedging issues).

The edge of the bearing opening is segmented into multiple functional features: the main bearing opening itself, and multiple guide recesses distributed around its perimeter. These recesses are formed as separate, discrete features that can be easily manufactured using standard processes like injection molding or CNC machining. The segmentation allows the spacer to provide multiple functions (positioning, guiding, preventing wedging) without requiring complex overall design, as each recess is a simple, independent feature that contributes to the overall assembly ease.

The guide recesses are designed to work with the natural insertion process of the light guide. As the light guide is inserted into the bearing opening, the guide recesses automatically engage and guide it into the correct position without requiring external alignment tools or complex positioning mechanisms. The light guide's own geometry (its outer surface) interacts with the guide recesses to achieve self-alignment and self-positioning. This self-service mechanism ensures tight fixation for homogeneous light patterns while reducing assembly precision requirements, as the system self-corrects during assembly rather than requiring pre-aligned components.