Vehicle Pointer Light Distributor Refraction
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Solution Overview
Problem
Vehicle instrument cluster pointers suffer from inefficient light distribution, with light sources positioned off the axis of rotation resulting in wasted illumination as the pointer rotates, as light from the inner side never reaches a reflecting surface to be directed into the pointer arm.
Innovation Solution
Incorporating a light distributor with angled surfaces on its inner side adjacent to the pointer arm, which refracts light towards a reflecting surface to redirect it into the pointer arm, ensuring uniform illumination and utilizing otherwise wasted light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light sources are positioned off the axis of rotation to illuminate the pointer arm, then illumination is provided to the pointer, but light from the inner side of the rotational axis is wasted and does not reach the reflecting surface
Solution Approach 1:
The light distributor is divided into distinct functional zones: an outer light-receiving surface that captures light from off-axis sources, and an inner reflecting surface that redirects light into the pointer arm. This segmentation allows different portions of the light distributor to perform specialized functions, ensuring that light from all directions is utilized effectively.
Solution Approach 2:
The light distributor acts as an intermediary component between the off-axis light sources and the pointer arm. It captures light that would otherwise be wasted, redirects it through its internal structure, and delivers it to the pointer arm, thereby mediating the light transfer and eliminating energy loss.
2Illumination intensity
If light sources are positioned off the axis of rotation, then the pointer can be illuminated, but uniform illumination at any rotational position is not achieved
Solution Approach 1:
The light distributor features locally optimized surfaces: the outer portion is designed to maximize light capture from off-axis sources, while the inner portion is designed to efficiently reflect and redirect light into the pointer arm. This local differentiation ensures uniform illumination performance regardless of the pointer's rotational position.
Solution Approach 2:
The light distributor creates an equipotential illumination environment by ensuring that light is distributed uniformly to the pointer arm at all rotational positions. The geometric design of the light-receiving and reflecting surfaces compensates for variations in light source distance and angle, maintaining consistent illumination levels throughout the rotation.
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 enhances light distribution efficiency by redirecting 10-20% of previously wasted light from the inner side towards the pointer arm, providing more consistent and efficient illumination across the pointer's rotation.
Implementation Method 1
The angled surfaces refract rays toward the light reflecting surface
Implementation Method 2
The light reflecting surface is configured to reflect the rays into the pointer arm
Data Source
AI summary
A pointer for an instrument cluster assembly of a motor vehicle is provided. The pointer includes a pointer arm and a light distributor formed of light conducting material. The pointer arm has a proximal end and a distal end. The light distributor is disposed at the proximal end. The light distributor has a light receiving side and a light reflecting surface. The light distributor is configured to receive rays through the light receiving side. The light reflecting surface is configured to reflect rays into the pointer arm. The light receiving side has an inner portion and an outer portion. The inner portion is disposed closer to the distal end of the pointer arm than the outer portion is with respect to the distal end. Angled surfaces are disposed on the inner portion. The angled surfaces are configured to refract rays toward the light reflecting surface.