Oblique Projection Optical System Aberration Control
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Solution Overview
Problem
Existing oblique projection optical systems face challenges in achieving compactness while maintaining high performance for wide-angle projection, due to large mirror sizes and inefficient aberration correction, particularly in front projection setups.
Innovation Solution
The proposed oblique projection optical system includes a refraction optical portion with a positive optical power and a rotationally symmetric coaxial refraction group, combined with a concave and convex reflection surface, where an intermediate image is formed between the refraction optical portion and the concave reflection surface, and an aperture stop image is formed between the concave and convex reflection surfaces, adhering to specific conditional formulae to balance aberration correction and size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a convex mirror with weak optical power is used in the projection optical system, then the system can achieve wide-angle projection, but the mirror size becomes large
Solution Approach 1:
The patent changes the optical power parameter of the convex mirror from weak to strong, allowing the mirror to maintain wide-angle projection capability while reducing its size. This parameter optimization resolves the contradiction between projection capability and mirror size.
2Reliability
If a rotationally symmetric coaxial refraction lens group is used, then the system can focus light effectively, but the lens diameter on the enlargement side becomes large
Solution Approach 1:
The patent optimizes the refraction lens group configuration and its optical parameters to achieve effective focus while reducing the lens diameter on the enlargement side, resolving the contradiction between focus performance and lens size.
3Volume of moving object
If the distance between the concave mirror and the convex mirror is shortened, then the system becomes more compact, but aberration correction becomes inefficient
Solution Approach 1:
The patent optimizes the distance parameter between the concave and convex mirrors to achieve an optimal balance, maintaining compact system size while ensuring efficient aberration correction through proper spacing.
4Device complexity
If only two reflection surfaces are disposed as optical surfaces in the vicinity of and after the intermediate image, then the system structure is simplified, but the burden of aberration correction on the reflection surfaces increases
Solution Approach 1:
The patent optimizes the optical parameters and configurations of the two reflection surfaces to handle the aberration correction burden effectively, maintaining system simplicity while achieving proper aberration control.
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 enables super-wide angle projection with high performance and compactness, efficiently correcting aberrations and reducing the size of optical components, thereby enhancing the overall optical system's efficiency and usability in image projection apparatuses.
Implementation Method 1
a refraction optical portion having a positive optical power; an intermediate image of the image formed on the display device surface is formed between the refraction optical portion and the concave reflection surface
Implementation Method 2
a concave reflection surface having a positive optical power
Implementation Method 3
a convex reflection surface having a negative optical power
Data Source
AI summary
An oblique projection optical system enlarges an image formed on a display device surface, and obliquely projects the enlarged image on a screen surface. The oblique projection optical system has, in the order from a reduction side: a refraction optical portion having a positive optical power, a concave reflection surface having a positive optical power, and a convex reflection surface having a negative optical power. The refraction optical portion includes a rotationally symmetric coaxial refraction group. An intermediate image of the image formed on the display device surface is formed between the refraction optical portion and the concave reflection surface. An aperture stop image is formed between the concave reflection surface and the convex reflection surface. The concave reflection surface and the convex reflection surface fulfill prescribed conditional formulae.