Projection Optical System Aberration Control via Single Lens Segmentation
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Solution Overview
Problem
The challenge is to develop a projection optical system that maintains high light resistance and optical performance stability despite size reduction and temperature changes, which existing systems struggle with due to local light concentration and sensitivity to temperature variations.
Innovation Solution
A projection optical system comprising seven to nine single lenses with a specific configuration, including one or two positive lenses and two or three negative lenses on either side of an aperture stop, which effectively controls spherical aberration, astigmatism, and chromatic aberration, and is designed to withstand temperature changes by avoiding cemented lenses and optimizing lens placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the projection optical system is reduced in size, then the size of the image projection device is reduced, but local concentration of light increases causing reduced light resistance and optical performance stability
Solution Approach 1:
The patent applies local quality by using single lenses with specifically designed asymmetric surface shapes rather than uniform cemented lens structures. Each lens surface is optimized for its local function: the first surface corrects spherical aberration while the second surface addresses coma and astigmatism. This localized optimization allows the compact system to maintain optical performance stability despite size reduction and temperature variations.
Solution Approach 2:
The patent employs parameter changes by precisely controlling the shapes and curvatures of lens surfaces through mathematical relationships between radii of curvature. The asymmetric surface designs and specific curvature ratios allow the compact optical system to correct aberrations effectively while maintaining stability against temperature changes, resolving the contradiction between size reduction and performance reliability.
2Reliability
If cemented lenses are used to correct aberrations, then optical performance is improved, but sensitivity to temperature changes increases
Solution Approach 1:
The patent applies segmentation by dividing the optical system into separate single lenses instead of using cemented lens assemblies. Each lens is independently designed with specific surface shapes to correct particular aberrations. This segmentation eliminates the temperature sensitivity issues associated with cemented joints while maintaining effective aberration correction through the coordinated design of multiple independent lens elements.
Solution Approach 2:
Each single lens in the patent is designed with asymmetric surface shapes optimized for specific local functions. The first lens surface is shaped to correct spherical aberration, while the second surface addresses coma and astigmatism. This localized optimization allows effective aberration correction without the temperature sensitivity inherent in cemented lens structures.
3Volume of moving object
If the number of lenses is reduced to minimize size, then device compactness is improved, but ability to correct multiple aberrations simultaneously is reduced
Solution Approach 1:
The patent employs parameter changes by using asymmetric surface shapes and specific curvature relationships in each lens element. The mathematical optimization of surface parameters allows each lens to correct multiple types of aberrations simultaneously. This enables a compact seven-to-nine lens system to achieve comprehensive aberration correction that would normally require more numerous or larger optical 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
This configuration ensures high light resistance and maintains optical performance stability across varying temperatures, balancing projection size and distance while correcting aberrations, thus enhancing the overall performance of image projection devices.
Implementation Method 1
The projection optical system includes a whole lens system of seven to nine lenses and an aperture stop... One negative lens and one or two positive lenses are located on a magnifying side with respect to the aperture stop... Two negative lenses and three or four positive lenses are located on a reducing side with respect to the aperture stop
Data Source
AI summary
A projection optical system is for an image projection device. The projection optical system includes a whole lens system of seven to nine lenses and an aperture stop. The seven to nine lenses are all single lenses. One negative lens and one or two positive lenses are located on a magnifying side with respect to the aperture stop. Two negative lenses and three or four positive lenses are located on a reducing side with respect to the aperture stop. A lens adjacent to the magnifying side of the aperture stop and a lens adjacent to the reducing side of the aperture stop are both a negative lens.