Light-Mixing Flashlight Parabolic Spherical Reflectors
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Solution Overview
Problem
Conventional flashlights with diffusion devices for mixing light suffer from decreased light emitting efficiency due to the diffusion process, which compromises the color contrast needed for effective disease identification in pediatric diagnosis.
Innovation Solution
A light-mixing flashlight design featuring three light-emitting diodes (red, green, and blue) with parabolic and spherical reflectors that enhance light mixing and directionality without a diffusion device, maintaining high emitting efficiency by reflecting light through carefully positioned and angled reflectors to form a white light with increased color contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a diffusion device is used to mix light from multiple LEDs, then the light mixing effect is improved, but the light emitting efficiency is decreased
Solution Approach 1:
The diffusion device is divided into multiple independent light guiding tubes, each responsible for guiding light from specific LEDs. This segmentation allows light mixing to occur through the structured arrangement of multiple tubes rather than through a bulk diffusion medium, reducing light loss while achieving uniform color mixing.
Solution Approach 2:
The patent transitions from traditional planar diffusion sheets to three-dimensional light guiding tubes with specific geometric structures. The tubes extend along the optical axis and incorporate internal reflective surfaces, utilizing the third dimension to guide and mix light without requiring light to pass through multiple diffusion layers, thereby maintaining higher emitting efficiency.
2Stability of the object's composition
If conventional diffusion sheets are used for light mixing, then the color rendering is improved, but the color contrast is insufficient
Solution Approach 1:
Different light guiding tubes are designed with different optical properties and geometries to handle different LED light sources. Each tube is optimized for its specific function, allowing the system to maintain excellent color rendering from multiple LEDs while achieving superior color contrast through the selective guidance and mixing of different wavelength components.
Solution Approach 2:
The light guiding tubes utilize composite structures combining reflective surfaces with transparent or translucent materials. This composite design enables the tubes to both guide light effectively and mix colors while preserving the high emitting efficiency of the LED sources, overcoming the limitations of conventional diffusion sheets.
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 achieves improved light mixing and increased color contrast without reducing emitting efficiency, enhancing visual recognition of oral and other illuminated areas, such as in pediatric diagnosis, museum lighting, or diving applications.
Implementation Method 1
The first reflectors are respectively mounted in the light recesses and are formed as parabolic mirrors. Each first reflector is rotated 19 degrees relative to the longitudinal direction of the body... The second reflectors are formed as spherical mirrors, are mounted on the mounting surface, and respectively correspond to the first reflectors.
Data Source
AI summary
A light-mixing flashlight has a body, three light-emitting diodes, three first reflectors, and three second reflectors. The body has a mounting surface formed in the body, a body opening opposite to the mounting surface, and three light recesses formed in an interior of the body. The light-emitting diodes are mounted in the light recesses, and are respectively a red light, a green light, and a blue light light-emitting diode. The first reflectors are formed as parabolic mirrors and are respectively mounted in the light recesses via a working angle. An opening of each first reflector faces toward the corresponding light-emitting diode. The second reflectors are formed as spherical mirrors, are mounted on the mounting surface, and respectively correspond in position to the first reflectors. Therefore, the light-mixing flashlight has an improved emitting efficiency.