Projection Optics Layout for Heat-Stable Image Formation
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Solution Overview
Problem
Conventional reflective-type projection apparatuses experience performance fluctuations, such as blur, due to high heat generation and light absorption by lenses near the stop, leading to potential damage and discoloration of cemented members.
Innovation Solution
An image formation optical system with a first and second refractive system, each having stops and lens surfaces, is designed to disperse ray heights and distances to reduce light absorption, using specific formulas to maintain lens separation and regulate ray angles, and employs glass materials with controlled Abbe's numbers and temperature coefficients to minimize heat and light impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If higher output light sources are used to increase brightness, then projection brightness is improved, but heat generation increases causing damage to cemented members and performance fluctuation
Solution Approach 1:
The optical system is divided into multiple lens groups with air spaces between them, preventing concentrated heat buildup in a single cemented structure. The patent uses separate lens elements rather than cemented members, segmenting the optical path to distribute thermal load.
Solution Approach 2:
The patent applies different material properties and structural characteristics to different regions of the optical system. Specifically, lens surfaces near the stop have optimized ray heights to reduce light absorption locally, while other regions maintain standard design parameters.
2Volume of moving object
If lenses are arranged close to the stop to compact the system, then device size is reduced, but light absorption increases causing performance fluctuation and blur
Solution Approach 1:
The patent optimizes specific parameters including ray height at lens surfaces (Y1-1, Y1-2, Y2-1, Y2-2) and distances from lenses to stops (D1-1, D1-2, D2-1, D2-2) to maintain stable optical performance while keeping the system compact. These parameter adjustments prevent excessive light absorption without requiring large separations.
3Length of stationary object
If lens surfaces are positioned near the stop, then optical path length is reduced, but temperature increase from light absorption causes blur and performance fluctuation
Solution Approach 1:
The patent replaces cemented mechanical lens structures with air-spaced lens arrangements. This substitution eliminates the thermal conduction path through cemented members and allows better thermal management while maintaining compact optical path length through optimized lens positioning.
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 system effectively prevents performance fluctuations by reducing light absorption and heat impact on lenses, maintaining optical quality and durability, especially for high-brightness projectors, while allowing for compact and high-quality image formation.
Implementation Method 1
a first refractive system arranged toward the reduction side of the intermediate image and a second refractive system arranged toward the magnification side of the intermediate image
Data Source
AI summary
An image formation optical system includes a first optical system, in which a first refractive system is arranged toward the reduction side of an intermediate image and a second refractive system is arranged toward the magnification side of the intermediate image, and the first refractive system has a first stop, and the second refractive system has a second stop. Lens surfaces are arranged next to and both toward the reduction side and toward the magnification side of the first stop and the second stop, and the following condition is satisfied:1.5<Y1-1 (unit of mm), whereY1-1 is the absolute value of the ray height of a principal ray at an outermost angle of view in rays emitted from a lens surface arranged next to and toward the reduction side of the first stop.