Vehicle Pointer Device Light Distribution Control
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Solution Overview
Problem
Existing pointer devices for vehicle indicator instruments suffer from non-uniform and distracting light distribution, with difficulty in adjusting the amount of light transmitted to various areas, leading to potential glowing halos and aesthetic issues.
Innovation Solution
A pointer device featuring a light-guiding body with a hub and cap configuration that separates light into independent flows using reflecting surfaces and an opaque cap to control light emission, preventing halos and allowing for uniform illumination, with the cap being separate from the body to prevent absorption and disturbance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a cap is mounted on the hub to control light emission, then glowing halos on the dial are prevented, but the light distribution becomes non-uniform and distracting
Solution Approach 1:
The cap is divided into multiple zones with different light transmission properties. The central zone has different transparency than the peripheral zones, allowing each zone to control light emission independently. This segmentation enables uniform light distribution across the pointer while preventing glowing halos on the dial by blocking excessive light in specific areas.
Solution Approach 2:
Different regions of the cap are assigned different optical properties (transparency/opacity) based on their specific function. The central region may be more transparent to allow light through to illuminate the pointer tip, while peripheral regions are more opaque to prevent halo formation on the dial. This local differentiation of quality resolves the contradiction between preventing halos and maintaining uniform illumination.
2Ease of manufacture
If the cap is co-moulded or over-moulded on the hub to form a single piece, then manufacturing is simplified, but the ability to independently control light transmission to various areas is reduced
Solution Approach 1:
The cap is provided as a separate component from the hub rather than being co-moulded or over-moulded. This segmentation allows the cap to be independently designed with specific optical zones and to be removed or replaced to change light transmission characteristics. The separate cap maintains manufacturing simplicity while enabling versatile light control that integrated designs cannot achieve.
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
The solution achieves uniform and disturbance-free light distribution, enhancing visibility and aesthetics by independently calibrating light flows, reducing interference and maintaining a simple, economic design.
Implementation Method 1
a pointer device (1) for an indicator instrument (2), in particular for a vehicle, comprising a body (10) which is defined by a light-guiding material
Implementation Method 2
separates light into independent flows using reflecting surfaces
Implementation Method 3
an opaque cap to control light emission, preventing halos
Data Source
AI summary
A pointer device has a light-guiding body, including a shaft, a hub coaxial with the shaft and having a rear surface covered by a shield, and a pointer, which projects radially from the hub. A cap is defined by at least one piece separate from the light-guiding body and is mounted on the hub in a fixed position. The hub has an emitting surface, a first reflecting surface configured to reflect and direct a first light flow from the shaft to the pointer, and at least a second reflecting surface, which is configured to reflect and direct a second light flow from the shaft to the emitting surface and is, at least in part, set apart from the first reflecting surface. The cap has at least one light-permeable area, aligned with the emitting surface, and a barrier arranged radially between the emitting surface and the first reflecting surface.