Projection Optical System Compact Design via Intermediate Image Deflection
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Solution Overview
Problem
There is a demand for a projection optical system that is compact in size while maintaining favorable optical performance, which existing systems struggle to achieve.
Innovation Solution
The projection optical system consists of a first optical system and a second optical system, with an intermediate image formed between them. The first optical system includes an optical path deflection surface and satisfies Conditional Expression (1): 0.2 < Imax/Ddef < 0.7, where Imax is the radius of the maximum effective image circle and Ddef is the distance from the lens surface closest to the magnification side to the optical path deflection surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a projection optical system is designed to be compact in size, then the system length is reduced, but optical performance deteriorates
Solution Approach 1:
The projection optical system is divided into multiple lens groups (first through fourth lens groups) with different optical powers arranged in sequence. This segmentation allows each group to contribute differently to the overall optical performance, enabling compact design while maintaining image quality through optimized distribution of optical functions across groups with varying powers
Solution Approach 2:
Each lens group is designed with specific local optical characteristics (positive or negative power) tailored to its position in the optical path. The first lens group has positive power, the second has negative power, the third has positive power, and the fourth has negative power, creating localized optical corrections that collectively achieve high performance in a compact configuration
2Length of moving object
If the distance from the lens surface to the optical path deflection surface is reduced, then the system size is reduced, but image quality deteriorates
Solution Approach 1:
The patent optimizes the distance parameter Ddef (distance from the lens surface closest to the magnification side to the optical path deflection surface) by establishing specific conditional expressions that define acceptable ranges. By carefully controlling this parameter within optimized bounds, the system achieves compact size while preventing degradation of image quality and optical performance
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 allows for a compact projection optical system with improved optical performance, achieving a balance between size reduction and maintaining high image quality.
Implementation Method 1
the first optical system includes an optical path deflection surface which deflects an optical path
Implementation Method 2
consists of, in order from the magnification side to the reduction side along an optical path, a first optical system and a second optical system
Data Source
AI summary
The projection optical system projects an image on a reduction side to a magnification side, does not include a reflecting surface having a power, and consists of, in order from the magnification side to the reduction side along an optical path, a first optical system and a second optical system. An intermediate image is formed between the first optical system and the second optical system, and the first optical system includes an optical path deflection surface which deflects an optical path. Assuming that a radius of a maximum effective image circle on the reduction side is Imax, a distance on an optical axis from a lens surface closest to the magnification side in the first optical system to the optical path deflection surface is Ddef, 0.2<Imax/Ddef<0.7 is satisfied.