Compact Zoom Lens with Wide Angle Aberration Correction
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Solution Overview
Problem
Existing compact zoom lenses with wide angles face challenges in achieving both a wide angle of view and high optical performance while minimizing size, as they often struggle with aberration correction and lens unit configuration, particularly in ultra-wide-angle zoom lenses exceeding 90 degrees.
Innovation Solution
A zoom lens configuration that includes a first lens unit with negative refractive power and a second lens unit with positive refractive power, along with an aperture stop, where the distance between adjacent lens units changes during zooming, and specific inequalities are satisfied to optimize focal lengths and distances, ensuring a wide angle of view and effective aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a negative lead type zoom lens is used to achieve a wide angle of view, then the angle of view is improved, but the lens diameter and overall length increase
Solution Approach 1:
The patent applies parameter changes by precisely controlling the focal length ratio (|fG1/f1|) between the first negative lens and the first lens unit, and the distance ratio (St/TDt) from the object surface to aperture stop relative to the overall lens length. These parameter optimizations enable a compact lens structure while maintaining ultra-wide-angle performance, resolving the contradiction between wide angle of view and compact size.
2Stability of the object's composition
If lens units are arranged to achieve ultra-wide-angle exceeding 90 degrees, then the angle of view is improved, but aberration correction becomes more difficult
Solution Approach 1:
The patent applies local quality by assigning specific functional characteristics to different lens elements within the first lens unit. The first lens unit contains at least four lens elements with carefully designed focal lengths and positions, where each element contributes to correcting specific aberrations while maintaining the ultra-wide-angle capability. This localized optimization of lens element properties enables both ultra-wide-angle performance and effective aberration correction.
3Reliability
If the first lens unit includes at least four lens elements with specific power arrangement, then optical performance is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the first lens unit into at least four distinct lens elements with specific refractive powers arranged in sequence. This segmentation allows each lens element to be optimized for specific optical functions, enabling high optical performance through controlled aberrations while maintaining a manageable structural complexity through systematic arrangement.
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 enables the creation of a compact zoom lens with a wide angle of view and high optical performance across the entire zoom range, effectively correcting aberrations and minimizing lens diameter and overall length.
Implementation Method 1
a first lens unit having negative refractive power, a second lens unit having positive refractive power
Data Source
AI summary
A zoom lens includes, in order from an object side to an image side, a first lens unit having negative refractive power, a second lens unit having positive refractive power, and an aperture stop. A distance between adjacent lens units changes during zooming. The first lens unit includes at least three or four lens elements. Predetermined inequalities are satisfied.