Light-Emitting Optics for Safe 3D Measurement Under Failure
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Solution Overview
Problem
Existing light-emitting devices in portable information processing terminals face challenges in diffusing light to achieve a predetermined light intensity distribution for three-dimensional shape measurement while preventing light leakage that exceeds safety standards, especially when components like the diffusion plate or light intensity reduction member fail.
Innovation Solution
A light-emitting device comprising a light source with plural light-emitting elements, a first optical member to reduce light intensity, and a second optical member to diffuse and irradiate light, ensuring the light intensity meets safety standards even in the event of component failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a diffusion plate is used to diffuse light from the light source, then the light intensity distribution is improved, but light leakage exceeding safety standards may occur when the diffusion plate fails
Solution Approach 1:
The light-emitting elements are divided into multiple groups (first group and second group) with different emission characteristics. The first group emits light in a first direction with first intensity, while the second group emits light in a second direction with second intensity. This segmentation ensures that even if one group fails, the other group maintains safe light leakage levels while still providing functional illumination.
Solution Approach 2:
Different regions of the light source have different emission properties tailored to specific requirements. The first light-emitting elements are positioned and configured to provide primary illumination, while the second light-emitting elements are positioned to control light leakage in specific directions. This local differentiation of emission characteristics allows the system to meet both illumination requirements and safety standards under various failure conditions.
2Reliability
If light intensity is reduced to meet safety standards, then light leakage control is improved, but the effectiveness of three-dimensional shape measurement may be degraded
Solution Approach 1:
The system dynamically controls the emission characteristics of different light-emitting element groups based on operational requirements. By selectively activating and adjusting the intensity of the first and second groups, the system can optimize the balance between measurement effectiveness and light leakage control for different measurement scenarios and failure conditions.
Solution Approach 2:
The light-emitting elements operate in periodic cycles, alternating between different emission patterns. This periodic operation allows the system to accumulate sufficient light intensity for accurate three-dimensional measurement during active phases while ensuring that light leakage remains within safe limits during transition phases or under failure conditions.
3Illumination intensity
If multiple light-emitting elements are arranged to provide uniform illumination, then the light intensity distribution is improved, but the complexity of controlling light leakage in all directions increases
Solution Approach 1:
The light-emitting elements are arranged in an asymmetric configuration where the first group and second group have different spatial distributions and emission directions. This asymmetric arrangement simplifies the control of light leakage by directing different groups toward different regions, reducing the need for complex control mechanisms while maintaining uniform overall illumination and meeting safety standards.
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 effectively maintains light intensity within safety limits, preventing excessive light leakage and ensuring reliable three-dimensional shape measurement and user authentication, even when the diffusion plate or light intensity reduction member is damaged.
Implementation Method 1
a first optical member that is provided in a light-emitting path of the light source, the first optical member being configured to reduce intensity of light emitted from the light source
Implementation Method 2
a second optical member that is provided on a light-emitting side of the first optical member and is configured to diffuse and irradiate light incident from the first optical member
Data Source
AI summary
A light-emitting device includes: a light source including plural light-emitting elements; a first optical member that is provided in a light-emitting path of the light source, the first optical member being configured to reduce intensity of light emitted from the light source and emit the light; and a second optical member that is provided on a light-emitting side of the first optical member and is configured to diffuse and irradiate light incident from the first optical member.