Projection Zoom Lens Aberration Correction via Six-Group Segmentation
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Solution Overview
Problem
Conventional projection zoom lenses have an insufficient angle of view to meet the demands for wider angles and higher resolution, particularly with the increasing number of pixels in light valves, especially in applications requiring large image projection with short projection distances.
Innovation Solution
A projection zoom lens system comprising six lens groups with specific refractive power arrangements and distance relationships between them, including a negative refractive power in the first lens group and a positive refractive power in the second lens group, along with a configuration that allows the distances among adjacent lens groups to change with magnification, ensuring a wide angle of view and compatibility with high pixel densities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the angle of view is widened to enable projection onto larger screens with shorter projection distances, then the projection capability is improved, but the optical performance and aberration correction become more difficult to maintain
Solution Approach 1:
The projection zoom lens is divided into six lens groups (G1-G6) with specific refractive powers, where each group contributes to different aspects of aberration correction and angle of view enhancement. The segmentation allows independent optimization of each group's function while maintaining overall system performance.
Solution Approach 2:
Specific lens groups are assigned particular functions: G1 and G2 handle wide-angle correction, G3 and G4 address distortion and field curvature, while G5 and G6 focus on chromatic aberration and sharpness. This local quality assignment ensures each region of the optical system optimizes for its specific challenge.
2Measurement precision
If the number of pixels in light valves is increased to achieve higher resolution, then the image quality is improved, but the requirement for lens precision and aberration correction becomes more stringent
Solution Approach 1:
The patent specifies precise parameter ranges for lens focal lengths, refractive powers, and group distances to ensure high-resolution performance. By carefully controlling these parameters within defined ranges, the system achieves optimal aberration correction for high pixel density light valves.
Solution Approach 2:
The six-lens-group configuration serves multiple functions simultaneously: it corrects spherical aberration, coma, astigmatism, field curvature, and chromatic aberration while maintaining telecentric properties and supporting various zoom ratios. This multi-functionality ensures compatibility with high-resolution light valves.
3Adaptability or versatility
If a zoom lens configuration is adopted to enable magnification changes, then the versatility is improved, but the complexity of the lens system increases
Solution Approach 1:
The lens groups are designed to move dynamically along the optical axis during zooming, with specific groups (G2, G3, G4, G5) shifting positions to change magnification. This dynamic configuration enables continuous zoom adjustment while maintaining focus and aberration correction across the zoom range.
Solution Approach 2:
Multiple lens groups with different refractive powers are merged into a single integrated zoom lens system. The combination of negative and positive power groups in six distinct clusters allows the system to achieve zoom functionality while sharing common optical paths and mounting structures, reducing overall complexity.
4Measurement precision
If the lens is configured to be telecentric at the reduction side to improve color combining properties, then the color accuracy is improved, but the angle of view is reduced
Solution Approach 1:
The lens system employs asymmetric configuration where the first two lens groups (G1 with negative power, G2 with positive power) are optimized for wide-angle and telecentric properties at the reduction side, while the remaining groups (G3-G6) compensate for the angle of view reduction. This asymmetric design allows simultaneous achievement of telecentricity and wide angle of view.
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 provides a projection zoom lens with a wide angle of view and high optical performance, capable of handling increased pixel densities, while maintaining telecentric properties and effectively correcting various aberrations, thus enhancing image projection quality.
Implementation Method 1
a first lens group G1 having a negative refractive power; a second lens group G2 having a positive refractive power
Data Source
AI summary
A projection zoom lens is essentially constituted by, in order from the magnification side: a negative first lens group; a positive second lens group; a third lens group; a positive fourth lens group; a fifth lens group; and a positive sixth lens group. The distance between the first and second lens groups is shorter, the distance between the second and third lens groups is longer, the distance between the third and fourth lens groups is shorter, the distance between the fourth and the fifth lens groups is longer, and the distance between the fifth and sixth lens groups is longer at the telephoto end than at the wide angle end. A lens having a negative refractive power in the paraxial region is provided most toward the magnification side in the first lens group. The fifth lens group has a negative lens.