Instrumental Device Light Shield Arc Shape for Uniform Illumination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional meters on mobile objects suffer from uneven light brightness due to a circular light shield, leading to reduced visibility, which is difficult to correct without increasing man-hours for dimming prints.
Innovation Solution
An instrumental device with a light shield having an arc-shaped outer periphery to maintain constant distance from the concave's outer periphery, combined with inclined inner walls to reflect light uniformly across the dial plate, and legs to direct light towards the index, ensuring consistent illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a circular light shield is used, then the light source can be effectively positioned, but uneven brightness is generated in the circumferential direction of the concave
Solution Approach 1:
The light shield is designed with an asymmetric shape where the distance from the light source to the light shield varies in the circumferential direction. Specifically, the light shield has a shorter distance portion and a longer distance portion, creating intentional asymmetry that compensates for the natural light decay pattern, thereby achieving uniform brightness distribution across the dial plate.
Solution Approach 2:
The invention changes the geometric parameters of the light shield, specifically the distance parameter from the light source to different portions of the light shield. By adjusting this distance parameter circumferentially (shorter at some positions, longer at others), the light intensity distribution is controlled to achieve uniform brightness despite the point-source nature of the light emission.
2Illumination intensity
If dimming print is applied to cancel uneven brightness, then visibility can be improved, but manufacturing complexity and man-hours increase
Solution Approach 1:
The invention extracts the brightness uniformity control function from the post-manufacturing dimming print process and transfers it to the light shield's geometric design. By incorporating the compensation function directly into the light shield structure during manufacturing, the need for additional dimming print operations is eliminated, simplifying the overall manufacturing process.
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 homogenizes light distribution across the dial plate, enhancing visibility by maintaining consistent light intensity and improving illumination of indexes, thereby improving the overall visibility and ease of operation.
Implementation Method 1
The case is provided with a light shield interposed between the index and the light source and facing the light source
Implementation Method 2
an inner peripheral wall of the concave is so provided as to reflect light from the light source
Data Source
AI summary
An instrumental device includes: a dial plate formed in a circular plate shape, and on which indexes indicating a condition of a mobile object are arranged in a circumferential direction of the dial plate; a case provided with a concave formed in a concave groove shape along the indexes, and to which the dial plate is attached so as to cover an opening of the concave; and a light source provided on a rear side of the dial plate in the concave opposite to the index, and emitting light toward the index. The case is provided with a light shield interposed between the index and the light source and facing the light source. At least a part of an outer periphery 36 of the light shield is formed in an arc shape so that a distance from an outer periphery of the concave is constant.