Projection Lens Aberration Correction via Group Segmentation
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Solution Overview
Problem
Existing projection lenses for display devices with wide angles and compact configurations fail to adequately correct various aberrations, leading to suboptimal performance and higher costs.
Innovation Solution
A projection lens system with specific optical configurations, including a reference lens with negative refractive power, aspheric surfaces, and a cemented lens structure, that satisfies conditional expressions for focal lengths and pupil magnification, ensuring effective aberration correction and cost reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a projection lens is designed to be compact with wide angle, then the device size is reduced and portability is improved, but aberration correction becomes insufficient
Solution Approach 1:
The lens is divided into multiple groups (front group, rear group, and reference lens) with specific functions. The front group handles wide-angle light collection, the rear group manages aberration correction, and the reference lens provides focal length control. This segmentation allows each group to be optimized for its specific function while maintaining overall compactness.
Solution Approach 2:
Different lens elements are assigned different refractive powers and shapes based on their specific functions. The reference lens has negative refractive power for focal control, while other elements have customized properties for aberration correction. This local optimization of lens properties enables compact design without sacrificing correction quality.
2Ease of manufacture
If conventional lens structures are used for wide-angle projection, then manufacturing cost is reduced, but projection performance deteriorates
Solution Approach 1:
The patent optimizes specific parameters including focal length ratios (fM/fF and fM/fR), pupil magnification (βP), and half-angle of view (ω) to achieve the desired balance between cost and performance. By carefully controlling these parameters within specified ranges, the lens achieves satisfactory projection performance while maintaining manufacturing feasibility.
3Reliability
If more lens elements are added to correct aberrations, then aberration correction improves, but device complexity and cost increase
Solution Approach 1:
Multiple lens elements are combined into functional groups (front group, rear group) that work together synergistically. The reference lens is integrated with these groups to provide focal length control. This merging approach achieves effective aberration correction while avoiding the complexity of having entirely separate correction systems.
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 achieves a compact, cost-effective projection lens with improved wide-angle performance and satisfactory aberration correction, enabling favorable projection performance and size reduction.
Implementation Method 1
a projection lens which projects optical images generated by light modulated by the light valve onto a screen
Data Source
AI summary
When a single lens which includes a surface having the smallest effective beam diameter or a cemented lens is designated as a reference lens, a system substantially consisting of lenses disposed closer to a magnification side than the reference lens is designated as a front group, and a system substantially consisting of lenses disposed closer to a reduction side than the reference lens is designated as a rear group, the projection lens satisfying conditional expressions (1) and (2) given below as well as conditional expressions (3) and (4): 75<2ω(1), βP<10 (2), |fM/fF|<2.0 (3), and |fM/fR|<2.0 (4).