Prismoidal Light Source Housing for Projector Brightness
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Solution Overview
Problem
Projector apparatuses using ultra-high voltage mercury lamps face issues with high power consumption, heat radiation, noise, and short lifespan due to inadequate cooling, while LED light sources provide insufficient illumination due to limited arrangement in a small space.
Innovation Solution
A pyramidal or prismoidal light source housing with dichroic mirrors and total reflection surfaces allows for the efficient arrangement and emission of LEDs in a three-dimensional manner, optimizing light distribution and reducing light loss by using dichroic mirrors to separate and direct light of different wavelengths, and total reflection mirrors to maximize illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If LEDs are arranged on one end surface of a light tunnel, then the structure is simple, but the number of LEDs that can be arranged is limited and sufficient illumination is not obtained
Solution Approach 1:
The patent transitions from two-dimensional planar arrangement of LEDs on a single surface to three-dimensional arrangement by placing LEDs on multiple inclined surfaces (first, second, third, and fourth inclined surfaces) within the light tunnel, thereby increasing the arrangement capacity and total light output while maintaining structural efficiency
2Illumination intensity
If LEDs are arranged in a three-dimensional manner on multiple inclined surfaces, then more LEDs can be arranged and brighter light source is achieved, but light beams may contact wrong dichroic mirrors and cause light loss
Solution Approach 1:
The patent applies different optical properties to different surfaces: the first and second inclined surfaces are equipped with dichroic mirrors that selectively reflect and transmit specific wavelength ranges, while the third and fourth inclined surfaces use total reflection mirrors for all wavelengths, optimizing light directionality and minimizing loss for LEDs arranged on each specific surface
Solution Approach 2:
The patent uses dichroic mirrors with wavelength-selective reflective and transmissive properties to direct different color ranges (wavelengths) of light from LEDs to appropriate paths, ensuring that blue/violet light from first inclined surface LEDs and yellow/red light from second inclined surface LEDs are properly separated and directed without mutual interference
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 enables a brighter light source with improved efficiency by allowing more LEDs to be used effectively, reducing light wastage, and enhancing the compactness and brightness of the projector apparatus.
Implementation Method 1
the first inclined surface being formed of a first dichroic mirror which transmits light of a wavelength less than a predetermined wavelength and reflects light of a wavelength equal to or greater than the predetermined wavelength
Implementation Method 2
the second inclined surface being formed of a second dichroic mirror which transmits light of a wavelength equal to or greater than the predetermined wavelength and reflects a light of a wavelength less than the predetermined wavelength
Implementation Method 3
the third and fourth inclined surfaces each having internal surfaces formed of total reflection mirrors
Data Source
AI summary
A light source apparatus is provided with a prismoidal light source housing having a first inclined surface formed of a dichroic mirror which transmits light of a wavelength less than 600 nm and reflects light of a wavelength of 600 nm or more, a second inclined surface opposed to the first inclined surface and formed of a dichroic mirror which transmits light of a wavelength of 600 nm or more and reflects a light of a wavelength less than 600 nm, green LEDs and blue LEDs are arranged on an external surface of the first inclined surface, and red LEDs which are arranged on an external surface of the second inclined surface.