Projection Optical System Wide Angle Aberration Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current projection optical systems fail to achieve a wide angle of view while effectively correcting aberrations without increasing costs, as they often require large aspherical mirrors and excessive lens sizes, and existing solutions do not adequately address the need for high-resolution compatibility with modern light valves.
Innovation Solution
A projection optical system comprising a first optical system and a second optical system with specific focal length ratios and configurations, including conditional formulas to ensure a wide angle of view, reduced lens sizes, and aberration correction, which does not require expensive aspherical mirrors, using a combination of lenses and optical path bending means to achieve high projection performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an aspherical mirror is used to widen the angle of view, then the angle of view is widened, but the mirror size becomes large and cost increases
Solution Approach 1:
The patent replaces expensive aspherical mirrors with conventional spherical mirrors and lens combinations. By using standard optical components instead of specialized aspherical mirrors, the system achieves wide angle of view while significantly reducing manufacturing cost and complexity.
Solution Approach 2:
The patent substitutes the mechanical/optical correction method (aspherical mirror shape) with a system-based approach (combination of spherical mirrors and lenses). This replacement achieves the same functional goal of wide angle view through a different optical mechanism that is easier and cheaper to manufacture.
2Adaptability or versatility
If the focal length is shortened to widen the angle of view, then the angle of view is widened, but the lens diameter toward the magnification side becomes excessively large
Solution Approach 1:
The patent divides the optical system into multiple segments (first optical system with spherical mirror, second optical system with lenses). This segmentation allows each component to be optimized independently, enabling the second optical system to use smaller lenses while still achieving the required wide angle of view through the combined action of both systems.
Solution Approach 2:
The patent introduces an intermediate image formation mechanism where the first optical system creates an intermediate image that is then processed by the second optical system. This intermediary approach allows the system to achieve wide angle view without requiring excessively large lenses in the second system, as the intermediate image serves as a reduced-size version of the final image.
3Manufacturing precision
If aberrations are corrected independently by first and second optical systems, then aberration correction is achieved, but the angle of view cannot be widened to the required degree
Solution Approach 1:
The patent merges the aberration correction function with the angle of view expansion function by designing the first and second optical systems to work cooperatively. The spherical mirror in the first system and the lenses in the second system are configured to simultaneously correct aberrations and widen the angle of view, rather than treating these functions separately.
Solution Approach 2:
The patent optimizes specific parameters of the optical systems, particularly the focal length ratio between the first and second optical systems. By carefully selecting and adjusting these parameters, the system achieves both effective aberration correction and the required wide angle of view, resolving the contradiction between these two requirements.
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 high projection performance with a wide angle of view while suppressing costs by optimizing lens sizes and aberration correction, enabling the projection of high-quality images at a wider angle without the need for costly aspherical mirrors.
Implementation Method 1
a first optical system constituted by a plurality of lenses that forms the image displayed by the image display elements as an intermediate image
Implementation Method 2
a second optical system constituted by a plurality of lenses that focuses the intermediate image on the magnification side conjugate plane
Data Source
AI summary
A projection optical system is constituted by, in order from the reduction side, a first optical system constituted by a plurality of lenses for forming an image displayed by image display elements as an intermediate image, and a second optical system constituted by a plurality of lenses for forming the intermediate image on a magnification side conjugate plane. Conditional Formula (1) below is satisfied.1.50<f2/|f|<2.80 (1).