Intermediate-Image Optical Layout for Wide-Angle Aberration Correction
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Solution Overview
Problem
Existing optical systems struggle to achieve a wide angle of view while effectively correcting various aberrations, particularly in projection devices and imaging apparatuses.
Innovation Solution
An imaging optical system comprising a first and second optical system with specific lens configurations and conditional expressions to form and re-form intermediate images, utilizing aspherical surfaces and telecentric design to correct aberrations and maintain a compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a wide angle of view is implemented in the optical system, then the field of view is improved, but various aberrations become more difficult to correct
Solution Approach 1:
The optical system is divided into multiple lens groups with specific positive and negative lenses arranged in sequence. This segmentation allows each lens to contribute to correcting specific aberrations while collectively achieving wide-angle performance, resolving the contradiction between wide field of view and aberration control
Solution Approach 2:
Different regions of the optical system are assigned different functions: certain lens groups are optimized for field curvature correction while others focus on distortion or chromatic aberration. This local optimization enables comprehensive aberration correction across the entire wide field of view
2Measurement precision
If high-resolution imaging is achieved, then image quality is improved, but the optical system becomes more complex
Solution Approach 1:
The patent employs aspherical surfaces with specific curvature parameters and refractive index variations to achieve high-resolution imaging. By optimizing these parameters, the system attains superior image quality without proportionally increasing complexity, as the aspherical parameters are integrated into the existing lens structure
Solution Approach 2:
Aspherical lens surfaces are utilized to correct spherical aberration and other monochromatic aberrations more effectively than spherical surfaces. This curvature modification enables high-resolution imaging while maintaining a manageable number of lens elements
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 achieves a high-resolution imaging with a wide angle of view and appropriate aberration correction, facilitating a compact and efficient projection type display device and imaging apparatus.
Implementation Method 1
an imaging optical system that forms an intermediate image at a position conjugate to a reduction-side imaging plane and re-forms the intermediate image on an enlargement-side imaging plane
Data Source
AI summary
The imaging optical system consists of a first optical system and a second optical system along an optical path in order from an enlargement side to a reduction side. An intermediate image is formed between the first optical system and the second optical system. The imaging optical system satisfies a conditional expression of 1.73<tan ωm<5 regarding a maximum half angle of view ωm of the enlargement side. The imaging optical system satisfies predetermined conditional expressions regarding a curvature radius of an LA lens disposed adjacent to the reduction side of a longest lens spacing that is a longest spacing among spacings on an optical axis between lenses in the imaging optical system and a curvature radius of an LB lens disposed adjacent to the reduction side of the LA lens.