Light Homogenizing Module Stray Light Shielding
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Solution Overview
Problem
Current projection devices face issues with optical elements overheating due to increased energy absorption, leading to potential cracking and reduced service life, despite efforts to reduce stray light using sheet metal integration rod covers which can reflect light back into the optical path.
Innovation Solution
A light homogenizing module with a light shielding element featuring a first reflection portion, second reflection portions, and a light entrance, designed to redirect and absorb unnecessary light, reducing energy absorption by optical elements and incorporating heat dissipation fins for improved thermal management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If higher energy light sources are used to increase brightness, then the illumination intensity is improved, but the temperature of optical elements increases causing cracking and reduced service life
Solution Approach 1:
The patent extracts and removes stray light from the optical path by integrating a light shielding component that blocks reflected light from re-entering the optical path, thereby preventing additional heat generation in optical elements while maintaining the high brightness output from high-energy light sources
Solution Approach 2:
The light shielding component acts as an intermediary element between the integration rod and the optical path, intercepting stray light before it can reflect back and contribute to thermal accumulation in optical elements, thus decoupling the brightness function from the thermal problem
2Object-generated harmful factors
If sheet metal integration rod covers are used to block light rays and reduce stray light, then the stray light formation is reduced, but light rays are reflected back into the optical path causing increased temperature in optical elements
Solution Approach 1:
The patent converts the potentially harmful reflected light into a controlled situation by using the light shielding component to intercept stray light that would otherwise reflect back into the optical path, transforming an uncontrolled thermal problem into a managed optical configuration where reflected light is deliberately blocked
Solution Approach 2:
The light shielding component extracts and removes stray light from the optical system by blocking its path, preventing the reflection that would otherwise occur with simple sheet metal covers, thus eliminating the source of thermal accumulation in optical elements
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 lowers the temperature of optical elements, increasing their service life and maintaining optical quality by minimizing stray light and heat absorption within the illumination system.
Implementation Method 1
The light shielding element includes a first reflection portion, at least one second reflection portion
Data Source
AI summary
A light homogenizing module, including a light homogenizing element and a light shielding element, is provided. The light homogenizing element includes a light incident surface and an axis perpendicular to the light incident surface. The light shielding element is disposed on a side of the light incident surface. The light shielding element includes a first reflection portion, at least one second reflection portion, and a light entrance. The first reflection portion surrounds the light entrance. The second reflection portion has a first end portion and a second end portion opposite to each other. The first end portion is connected to the first reflection portion. The second end portion is farther away from the light homogenizing element than the first reflection portion. The light entrance exposes the light incident surface. An extension direction of the first reflection portion is parallel to the light incident surface.