Projector Light-Adjustment Blades With Stepped Overlap to Reduce Heating
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Solution Overview
Problem
Existing light quantity adjustment devices in projection image display devices using laser light sources face issues of blade heating, deformation, and breakage due to high illumination light intensity, which affect contrast and brightness adjustment.
Innovation Solution
A light quantity adjustment device with blade substrates designed to rotate and overlap, featuring sections with varying heights and materials with high thermal conductivity and diffusive reflection, allowing for increased thickness and improved heat dissipation, reducing blade heating and deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the F-number is increased to enhance contrast, then a larger quantity of light hits the blades, but the blades become heated by the illumination light causing burning, deformation, and breakage
Solution Approach 1:
The blade substrate is designed with a stepped structure having different height levels (first height and second height). This dimensional variation allows portions of adjacent blade substrates to overlap when viewed from the thickness direction, creating a configuration where blades are positioned at different axial levels. This spatial arrangement reduces the concentration of light absorption on single planes, thereby mitigating heat accumulation while preserving the aperture's light-blocking function for contrast control.
Solution Approach 2:
Each blade substrate is divided into multiple sections (first section and second section) at different height levels. This segmentation of the blade structure into discrete vertical zones allows light to interact differently with each section, reducing the total absorbed energy concentration on any single blade portion and distributing thermal load across multiple segmented surfaces.
2Stability of the object's composition
If the F-number is increased, then contrast can be enhanced, but the quantity of light hitting the blades increases causing heating
Solution Approach 1:
By introducing height variation (first height and second height) to blade substrates, the invention creates a three-dimensional stepped configuration. When viewed from the thickness direction, sections at different heights overlap, forming a multi-level aperture structure. This dimensional approach allows light to be blocked effectively for contrast enhancement while distributing the light-absorbing surfaces across different axial positions, reducing heat concentration and generation.
Solution Approach 2:
Different sections of the blade substrate are positioned at different height levels (first section at first height, second section at second height). This local variation in blade geometry creates zones with different light exposure characteristics. The stepped configuration allows certain regions to be optimized for light blocking while other regions are positioned to minimize thermal absorption, applying local quality differentiation to resolve the contradiction between contrast enhancement and heat generation.
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 device effectively suppresses blade heating and deformation, enabling precise adjustment of contrast and brightness in projection image display devices, even with high-power laser light sources.
Implementation Method 1
materials with high thermal conductivity and diffusive reflection, allowing for increased thickness and improved heat dissipation
Implementation Method 2
materials with high thermal conductivity and diffusive reflection
Data Source
AI summary
A light quantity adjustment device of the present disclosure includes: blade substrates that are each provided rotatably with a rotation axis and an actuation axis; a first member having a first center aperture, defining positions of the rotation axes along a circumferential direction; and a second member that sandwiches the blade substrates between the first member, engaging the blade substrates via the actuation axes. The blade substrates are rotatable to change an amount by which the first center aperture is shielded. Each of the blade substrates includes a first section and a second section on a tip-end side, a bottom surface of the second section is positioned higher in a thickness direction than a top surface of the first section. When viewed from the thickness direction, at least at the stopping position, the second section of each blade substrate partially overlaps the first section of adjacent blade substrates.