Zoom Optical System With Refractive Power Balancing for Aberration Correction
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Solution Overview
Problem
Existing zoom optical systems face challenges in effectively correcting aberrations such as spherical aberration, coma aberration, and curvature of field, particularly during zooming from wide angle to telephoto end states, due to inadequate refractive power distribution among lens groups.
Innovation Solution
A zoom optical system comprising lens groups with specific refractive powers arranged in a manner that satisfies conditional expressions (-10.00<f3/(−fE)<3.50, -10.00<f1/(−fE)<3.50, -10.00<f2/fE<1.50, 1.50<f1/(−f2)<5.00, 0.80<f1/f3<2.50, and -2.00<f1/f4<4.00) to ensure optimal refractive power distribution, with the first lens group fixed and the third lens group moving towards the image surface during zooming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the refractive power distribution among lens groups is not optimized, then the aberration correction (spherical aberration, coma aberration, curvature of field) deteriorates during zooming from wide angle to telephoto end state
Solution Approach 1:
The patent applies parameter changes by establishing specific conditional expressions that define the refractive power relationships between lens groups. The conditional expressions (1) through (6) mathematically constrain the focal lengths and refractive powers of different lens groups to achieve optimal aberration correction across the zoom range, transforming a complex optical design problem into a set of solvable parameter relationships.
Solution Approach 2:
The patent implements local quality by assigning different refractive power characteristics to specific lens groups at different positions in the optical system. The first lens group has positive refractive power for wide angle performance, the second has negative refractive power for telephoto correction, and the third has positive refractive power for intermediate zone optimization, creating localized functional specialization throughout the system.
2Volume of moving object
If the lens barrel is miniaturized, then the device size is reduced, but the drive mechanism becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the lens system into distinct lens groups (first, second, and third lens groups) with different refractive powers, each capable of independent movement. This segmentation allows the drive mechanism to control each group separately, enabling miniaturization while maintaining manageable complexity through modular control of individual lens segments rather than moving the entire lens barrel.
3Manufacturing precision
If the third lens group moves toward the image surface during zooming, then the aberration correction improves, but the drive mechanism complexity increases
Solution Approach 1:
The patent implements dynamics by making the third lens group movable relative to the image surface during zooming operations. This dynamic positioning allows the lens group to be adjusted according to the zoom state, optimizing aberration correction at different focal lengths. The conditional expressions provide the mathematical framework for calculating the optimal positions, while the mechanical implementation uses controlled movement to achieve the desired optical performance.
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 excellent correction of spherical aberration, coma aberration, and curvature of field across various zoom states, simplifying the drive mechanism and enabling miniaturization of the lens barrel.
Implementation Method 1
a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, a third lens group G3 having a positive refractive power
Data Source
AI summary
A zoom optical system comprises a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a succeeding lens group, which are arranged in order from an object side. During zooming, distances between adjacent lens groups change, and the first lens group is fixed with respect to an image surface. During zooming from a wide angle end state to a telephoto end state, the third lens group moves toward an image surface. The succeeding lens group includes a last lens group arranged to be nearest to the image surface. Further, the following conditional expression is satisfied.−10.00<f3/(−fE)<3.50,where f3 represents a focal length of the third lens group, andfE represents a focal length of the last lens group.