Curved Light Guide for Mouse Rear Illumination

The patent introduces a curved reflective surface (including concave and convex curved surfaces) within the light guide member to redirect light paths. This curvature enables light emitted from the circuit board to be reflected at multiple angles, effectively reaching characters and patterns on the rear side that would otherwise be in shadow, thus resolving the contradiction between simple structure and effective illumination.

The patent transforms the lighting approach by adding a third dimension through the curved reflective surfaces. Instead of direct upward or downward light emission in a single dimension, the curved surfaces create multi-dimensional light paths, allowing light to reach the rear side characters through reflected paths that traverse multiple spatial dimensions.

The patent converts the otherwise wasted downward-emitted light into a useful resource. The curved reflective surfaces within the light guide member capture light that would otherwise be lost and redirect it toward the rear side characters, transforming what was originally harmful (light loss) into a beneficial illumination source.

The light guide member with curved reflective surfaces acts as an intermediary between the light source and the rear side characters. It mediates the light path by receiving downward-emitted light and redirecting it through multiple reflections to illuminate the target area, thereby improving light utilization efficiency without requiring direct line-of-sight illumination.

The patent employs curved reflective surfaces (concave and convex) instead of flat surfaces to extend the light propagation distance. The curvature of these surfaces enables light to be reflected at wider angles and travel farther across the light guide member, illuminating distant areas while maintaining manufacturing feasibility through standard molding techniques.

The patent changes the geometric parameters of the reflective surfaces from flat to curved, and from single-curved to multi-curved configurations. This parameter change increases the reflection angle range and extends the effective light propagation distance, allowing illumination of distant characters while remaining compatible with conventional manufacturing processes.