Zoom Lens System Aberration Control via Antireflection Coating
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Solution Overview
Problem
Conventional zoom lens systems face challenges in achieving high optical performance, particularly in suppressing ghost images and flare, especially when a high zoom ratio is required, as they struggle to effectively manage aberrations and reflections.
Innovation Solution
A zoom lens system configuration comprising multiple lens groups with specific refractive powers and focal lengths, where the first lens group moves relative to the image plane, and antireflection coatings are applied using a wet process to minimize reflections, adhering to specific conditional expressions to optimize optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional zoom lens systems use multilayer design technology and multilayer coating technology to improve optical performance, then antireflection coating performance is enhanced, but ghost images and flare are still generated from optical surfaces
Solution Approach 1:
The patent applies a specific conditional expression (0.3 < f1/(−f2) < 0.5) that defines precise parameter ranges for the focal lengths of the first and second lens groups. By controlling these optical parameters within specific ranges, the system achieves both high optical performance and effective suppression of ghost images and flare, resolving the contradiction between coating performance and reflection suppression.
2Adaptability or versatility
If conventional zoom lens systems increase zoom ratio, then magnification capability is improved, but sufficiently high optical performance cannot be obtained
Solution Approach 1:
The patent establishes a specific parameter relationship (0.3 < f1/(−f2) < 0.5) between the focal lengths of the first and second lens groups. This parameter control enables the system to achieve high zoom ratio while maintaining sufficiently high optical performance, resolving the contradiction between zoom capability and image quality.
3Manufacturing precision
If conventional zoom lens systems apply higher performance antireflection coatings, then coating effectiveness is improved, but reflection light producing ghost images and flare is still generated
Solution Approach 1:
The patent uses a specific conditional expression (0.3 < f1/(−f2) < 0.5) to control the optical parameters of the lens groups. This parameter optimization works in conjunction with antireflection coatings to further suppress reflection light and eliminate ghost images and flare, achieving both high coating performance and minimal reflections.
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 achieves excellent optical performance by effectively suppressing ghost images and flare, maintaining high image quality across various zoom ratios, and correcting aberrations, thereby enhancing the overall optical performance of the zoom lens system.
Implementation Method 1
at least one optical surface among optical surfaces in the first lens group and the second lens group is applied with an antireflection coating, and the antireflection coating includes at least one layer that is formed by a wet process
Data Source
AI summary
A zoom lens optical system includes, in order from an object side along an optical axis: a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having positive refractive power; a fourth lens group having negative refractive power; and a fifth lens group having positive refractive power, wherein upon zooming from a wide-angle end state to a telephoto end state, the first lens group being moved with respect to an image plane, a distance between the first lens group and the second lens group increasing, a distance between the second lens group and the third lens group decreasing, a distance between the third lens group and the fourth lens group varying, and a distance between the fourth lens group and the fifth lens group varying.