Zoom Lens Unit Layout for Compact Wide-Angle Aberration Control
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Solution Overview
Problem
Existing zoom lenses face challenges in achieving a reduced size, wide angle of view, high magnification variation ratio, and high optical performance with uniform resolution across the imaging angle of view, particularly in correcting chromatic and spherical aberrations.
Innovation Solution
A zoom lens configuration with a first lens unit having positive refractive power that does not move during zooming, combined with at least two movable lens units and a final lens unit with positive refractive power that also does not move, where the distance between adjacent lens units changes during zooming, and specific Abbe number and refractive index constraints are satisfied to correct aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a zoom lens is designed with a reduced size and wide angle of view, then the lens compactness and field of view are improved, but optical performance and aberration correction deteriorate
Solution Approach 1:
The patent applies parameter changes by carefully selecting the Abbe number (10.0 ≤ νp1 ≤ 17.4) and refractive index (1.95 < Np1 < 2.10) of the first positive lens to optimize optical performance. These parameter constraints enable effective aberration correction while maintaining the compact zoom lens design with wide angle of view and high magnification variation ratio.
2Adaptability or versatility
If the magnification variation ratio is increased, then the zoom capability is improved, but the lens size and complexity increase
Solution Approach 1:
The patent applies segmentation by dividing the zoom lens into multiple lens units with specific functions: a first lens unit with positive refractive power that remains stationary during zooming, at least two movable lens units, and a final lens unit with positive refractive power. This segmentation enables high magnification variation ratio while controlling overall lens size through optimized arrangement and movement of individual units.
3Reliability
If chromatic and spherical aberrations are corrected, then optical performance is improved, but the lens complexity and number of elements increase
Solution Approach 1:
The patent uses parameter changes by imposing specific constraints on the Abbe number (10.0 ≤ νp1 ≤ 17.4) and refractive index (1.95 < Np1 < 2.10) of the first positive lens. These parameter ranges are optimized to correct chromatic and spherical aberrations effectively without requiring excessive lens elements, thus controlling structural complexity while improving 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 solution results in a zoom lens that achieves a reduced size, wide angle of view, high magnification variation ratio, and high optical performance throughout the zoom range, effectively correcting chromatic and spherical aberrations.
Implementation Method 1
a first positive lens included in the at least one positive lens... νp1 is an Abbe number based on d-line of a first positive lens... 10.0≤νp1≤17.4
Data Source
AI summary
A zoom lens includes, in order from an object side to an image side, a first lens unit with positive refractive power that does not move during zooming, at least two movable lens units that move during zooming, and a final lens unit with positive refractive power that does not move during zooming. A distance between adjacent lens units changes during zooming. The first lens unit includes at least one negative lens and at least one positive lens. A predetermined inequality is satisfied.