Light Shield Plate Structure for Rod Integrator Heat Management
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Solution Overview
Problem
High-output lamps in digital cinema projectors cause excessive heat and light divergence, leading to premature deterioration of optical components and reliability issues in the illuminating optical system, especially when lamp outputs change.
Innovation Solution
A structure comprising a protecting tube for the rod integrator with strategically positioned light shield plates that reflect undesirable light, allowing only necessary light to enter the rod integrator, and a cooling system to manage heat, including cooling fins and a fan for air circulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a high-output xenon lamp (2kW-6kW) is used to increase brightness and performance, then the illumination intensity and projection quality are improved, but the heat generation and light divergence increase causing premature deterioration of optical components
Solution Approach 1:
The light shield plate is divided into multiple segments (first light shield plate and second light shield plate) that are positioned at different locations to selectively block divergent light rays from different angles, allowing the useful light to pass through while deflecting harmful divergent light away from optical components
Solution Approach 2:
The light shield plate acts as an intermediary element positioned between the light source and optical components, using reflective surfaces to redirect harmful divergent light while permitting useful light transmission, thereby protecting optical components without reducing overall illumination intensity
2Productivity
If the light shield plate opening is made larger to allow more light to reach the rod integrator, then the illumination efficiency is improved, but more divergent light reaches the optical components causing increased heat and deterioration
Solution Approach 1:
The light shield plate creates different light transmission qualities in different spatial regions: the central region allows useful light to pass through to the rod integrator, while peripheral regions block divergent light, achieving both high illumination efficiency and component protection
3Temperature
If cooling fins and air circulation are added to manage heat, then the temperature control is improved, but the device complexity increases
Solution Approach 1:
The cooling function is merged with the existing light shield plate structure by adding cooling fins directly to it, and the air circulation path is integrated with the housing structure, thereby achieving effective heat management without significantly increasing overall device complexity
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 solution effectively prevents temperature rises and maintains the reliability of optical components by reflecting unwanted light and ensuring efficient cooling, even when lamp outputs vary, thereby extending the lifespan of the projector's components.
Implementation Method 1
a light shield plate that is provided between the opening and a light source for emitting light to the rod integrator, the opening facing the light incident surface of the rod integrator, wherein the light shield plate has an opening for allowing light to pass therethrough so that the light is incident on the rod integrator
Implementation Method 2
a cooling system to manage heat, including cooling fins and a fan for air circulation
Data Source
AI summary
A structure for protecting a rod integrator that is used for a projection display apparatus is provided. The structure has: a protecting tube for the rod integrator, the protecting tube accommodating the rod integrator therein, wherein the protecting tube has openings which are defined at positions that face a light incident surface and a light exiting surface of the rod integrator, respectively; and a light shield plate that is provided between the opening and a light source for emitting light to the rod integrator, the opening facing the light incident surface of the rod integrator, wherein the light shield plate has an opening for allowing light to pass therethrough so that the light is incident on the rod integrator.