Light Guide Member Brightness Uniformity
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Solution Overview
Problem
Conventional light guide members in vehicle measuring instruments experience uneven brightness and luminance, particularly at the peripheral edges, and fail to adequately illuminate specific characters on the scale design, affecting the instrument's appearance.
Innovation Solution
A light guide member with a thick wall section near the scale design and a thin wall section extending away from the light source, featuring a triangular boundary end face that reflects light to enhance illumination, and triangular holes to redirect light, allowing for adjustable brightness and reduced luminance unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional light guide member with uniform thickness is used, then the structure is simple, but the brightness is uneven particularly at the peripheral edge parts
Solution Approach 1:
The light guide member employs varying thickness across different regions: a first thickness in the central region and a second thickness (greater than the first) in the peripheral edge region. This local quality variation ensures that light is distributed more evenly, with the thicker peripheral region compensating for light loss at edges, thereby achieving uniform brightness without requiring complex additional components.
2Illumination intensity
If the light guide member uses a simple structure, then the manufacturing is easy, but the luminance uniformity is poor
Solution Approach 1:
The invention changes the geometric parameter of the light guide member by introducing a thickness gradient. The member transitions from a first thickness in the central region to a second thickness in the peripheral edge region. This parameter change is achieved through standard molding techniques, making the manufacturing process straightforward while significantly improving luminance uniformity across the illumination surface.
3Illumination intensity
If the light guide member has uniform thickness, then the manufacturing process is simple, but the peripheral edge brightness is insufficient
Solution Approach 1:
The light guide member employs varying thickness across different regions: a first thickness in the central region and a second thickness (greater than the first) in the peripheral edge region. This local quality variation ensures that light is distributed more evenly, with the thicker peripheral region compensating for light loss at edges, thereby achieving uniform brightness without requiring complex additional components.
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 significantly enhances brightness at the peripheral edges, improves luminance uniformity, and allows for targeted brilliant illumination of specific design elements, enhancing the instrument's appearance and functionality.
Implementation Method 1
a boundary end face which is connected to a region of the thick wall section and a region of the thin wall section in the second face of the light guide member reflects the light transmitted in the light guide member from the light receiving portion to irradiate the scale design
Data Source
AI summary
A measuring instrument includes a light source (L), a dial plate (130) with a scale design (131), and a light guide member (20) provided between the light source and the dial plate for guiding light received from the light source to the dial plate. The light guide member has a first face that faces to the dial plate and a second face that is opposite to the first face. The light guide member includes a light receiving portion (22) for receiving the light from the light source, and a flat plate portion (21) for irradiating the light to the dial plate. The scale design is arranged in a circular shape around the light source. The flat plane portion includes a thick wall section (25q) that is positioned at a vicinity of the scale design, and a thin wall section (25p) extending from the thick wall section in a direction away from the light source. The thick wall section is thicker than the thin wall section in a direction perpendicular to the dial plate. A boundary end face (25a) connected to a region of the thick wall section and a region of the thin wall section in the second face of the light guide member reflects the light transmitted in the light guide member to irradiate the scale design (131).