Zoom Lens Design with Aspherical Aberration Correction
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Solution Overview
Problem
Conventional zoom lenses face challenges in achieving miniaturization and low manufacturing costs while maintaining high zooming rates and excellent picture resolution, as they require a large number of lens groups and complex lens arrangements to correct aberrations and ensure portability.
Innovation Solution
A zoom lens design featuring a first lens group with a negative refractive power, a second lens group with positive and negative aspherical lenses, and a third lens group with a high refractive index spherical lens, optimized to minimize lens thickness and number, using glass lenses to improve optical performance and reduce manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional zoom lens includes three lens groups with standard refractive powers, then the lens can be manufactured with moderate complexity, but it cannot achieve high zooming rate and miniaturization simultaneously
Solution Approach 1:
The patent changes the refractive power parameters of the lens groups: the first lens group has negative refractive power, the second lens group has positive refractive power, and the third lens group has positive refractive power. This parameter optimization enables the lens to achieve high zooming rate while maintaining compact size, resolving the contradiction between device complexity and adaptability.
2Length of stationary object
If the number of lens groups is decreased to minimize camera thickness, then portability is improved, but picture resolution deteriorates
Solution Approach 1:
The patent applies local quality by using aspherical surfaces specifically in the second lens group (positive and negative aspherical lenses). This localized application of aspherical geometry corrects optical aberrations and maintains picture resolution while keeping the overall lens structure compact with only three lens groups.
3Manufacturing precision
If aspherical lenses are used to correct optical aberrations, then picture resolution is improved, but manufacturing cost increases
Solution Approach 1:
The patent uses aspherical surfaces only in the second lens group rather than all lens groups. This localized approach provides effective aberration correction while minimizing manufacturing complexity and cost compared to using aspherical lenses throughout the entire optical system.
4Volume of moving object
If lens groups are arranged to minimize distance between lenses when retracted, then camera size is reduced, but optical performance deteriorates
Solution Approach 1:
The patent optimizes the refractive power parameters and arrangement of the three lens groups to achieve compact spacing while maintaining optical performance. The specific configuration of negative-positive-positive refractive power groups allows for minimal lens separation when retracted without sacrificing image quality.
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 design achieves a high zooming rate with a small-sized and cost-effective zoom lens, capable of being used in digital cameras and mobile phone cameras, while effectively correcting chromatic and spherical aberrations, thus enhancing image quality and portability.
Implementation Method 1
the second lens group includes a positive lens and a negative lens, the positive lens and the negative lens including three or more aspherical surfaces
Implementation Method 2
a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens group having a positive refractive power
Data Source
AI summary
A zoom lens and an imaging optical device including the same, the zoom lens including, sequentially from an object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens group having a positive refractive power, wherein the first lens group includes a spherical negative lens and an aspherical positive lens and the second lens group includes a positive lens and a negative lens, the positive lens and the negative lens including three or more aspherical surfaces.