Vehicle Instrument Scale Brightness Uniformity
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Solution Overview
Problem
Conventional vehicle instruments experience uneven brightness due to varying attenuation of light across protrusion-shaped scales, leading to inconsistent illumination.
Innovation Solution
Incorporating a high-diffusion portion on the light incident surface of protrusion-shaped scales with a larger diffusion degree for areas with smaller protrusion amounts, and forming the surface roughness differently to balance light diffusion across scales.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If protrusion-shaped scales are formed with varying protrusion amounts to display measurement values, then the scale can indicate different measurement levels, but the light attenuation varies across different protrusion portions causing uneven brightness
Solution Approach 1:
The patent applies local quality by providing a high-diffusion portion specifically at the light incident surface of the scale structure. This localized diffusion treatment compensates for the varying light attenuation caused by different protrusion amounts at different scale positions, ensuring uniform brightness across the entire scale while maintaining the measurement indication function.
Solution Approach 2:
The patent changes the diffusion parameter of light at the incident surface by introducing a high-diffusion portion. This parameter change compensates for the varying light transmission characteristics caused by different protrusion amounts, thereby achieving uniform brightness across scales with different heights while preserving the measurement value indication capability.
2Use of energy by moving object
If the light incident surface is made smooth for clear light transmission, then light can pass through efficiently, but portions with larger protrusion amounts become relatively darker due to increased light path length
Solution Approach 1:
The patent introduces a high-diffusion portion at the light incident surface to locally modify light diffusion characteristics. This localized treatment compensates for the increased light attenuation in portions with larger protrusion amounts, ensuring that all scale portions maintain uniform brightness while preserving overall light transmission efficiency.
Solution Approach 2:
The high-diffusion portion is provided in advance at the light incident surface to preemptively counteract the light attenuation effect caused by varying protrusion amounts. By introducing additional diffusion at the entry point, the patent compensates for the expected brightness variations before light traverses through different path lengths.
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 configuration ensures uniform brightness across the entire protrusion-shaped scale, suppressing unevenness and enhancing visual clarity in vehicle instrument displays.
Implementation Method 1
the light incident surface of a portion having a relatively small protrusion amount from the light incident surface is provided with a high-diffusion portion having a relatively large diffusion degree for the incident light
Data Source
AI summary
A vehicle instrument includes: a three-dimensional object which is formed of a light transmitting material and is formed so as to protrude from a surface displaying a measurement value involved with a vehicle; and a light source which emits light to the three-dimensional object, wherein the three-dimensional object includes a portion having a different protrusion amount from a light incident surface to which light emitted from the light source is incident, and the light incident surface of the portion having a relatively small protrusion amount from the light incident surface is provided with a high-diffusion portion having a relatively large diffusion degree for the incident light compared with the light incident surface of the portion having a relatively large protrusion amount from the light incident surface.