Light Guide Pointer Separating Face Reduces Luminance Unevenness
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Solution Overview
Problem
Conventional light guide pointers experience luminance unevenness due to light reflection at corners between the rotation shaft and the lower face, leading to increased luminance in certain areas of the light emitting face.
Innovation Solution
The design incorporates a light guide pointer with a light entrance shaft, a main pointer portion, a sub-pointer portion, and a light control space featuring vertex and inclined portions, along with a separating face on the lower face that extends away from the light emitting face, preventing light from being reflected towards the tip end and reducing luminance unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional pointer structure with a rotation shaft and lower face is used, then the pointer can rotate and guide light, but light reflected by the corner between the outer circumference face and lower face causes increased luminance at certain areas of the light emitting face, resulting in luminance unevenness
Solution Approach 1:
The invention extracts and removes the harmful corner reflection by introducing a separating face that divides the lower face into distinct functional regions. The separating face extends from the light entrance shaft toward the tip end, effectively separating the corner that causes unwanted reflection from the light path, thereby eliminating the harmful reflection while preserving the pointer's rotation and light guidance functions
Solution Approach 2:
The separating face acts as an intermediary element between the light entrance shaft and the light emitting face. It mediates the light path by providing a controlled surface that prevents direct reflection from the corner, while still allowing the pointer to perform its primary function of guiding light from the light source to the emitting face
2Ease of manufacture
If the lower face is designed as a simple flat surface, then the manufacturing is easier, but light reflects off the corner formed with the outer circumference face, causing luminance unevenness
Solution Approach 1:
The lower face is segmented into multiple functional regions by introducing the separating face. This divides the originally simple flat surface into distinct zones: a first region adjacent to the light entrance shaft and a second region adjacent to the light emitting face. This segmentation allows each region to be optimized for its specific function while maintaining manufacturability through standard molding techniques
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 effectively reduces luminance unevenness by ensuring that light is not reflected towards the tip end, maintaining consistent luminance across the light emitting face.
Implementation Method 1
light from the light source that has entered the pointer is totally reflected inside the pointer and is emitted from a surface (a light emitting face) of the pointer
Data Source
AI summary
A light guide pointer and a light emitting pointer device which can reduce luminance unevenness at a light emitting face are provided. A lower face of a main pointer portion includes a separating face extending away from a light emitting face, thus light reflected by a front inclined portion of a light control space, that is not likely to travel in a direction away from the light emitting face, is not likely to reach to a corner which is a boundary between the separating face and a recessed portion. Consequently, light is not likely to be reflected by the corner between the separating face and the recessed portion, thereby preventing luminance to be partially high at the light emitting face and thereby reducing luminance unevenness.