Four-Group Zoom Lens Using Spherical Lenses to Reduce Aberration
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Solution Overview
Problem
Conventional zoom lenses require multiple lens groups and aspheric lenses to achieve high resolution and low image distortion, leading to high manufacturing costs and complex optical structures.
Innovation Solution
A zoom lens design utilizing four lens groups with specific refractive powers, comprising spherical lenses only, to reduce aberration and manufacturing costs while maintaining high resolution and zoom capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If more than four lens groups and aspheric lenses are used, then high resolution and low image distortion are achieved, but manufacturing cost increases and optical structure becomes complex
Solution Approach 1:
The optical system is divided into four lens groups with specific refractive power distributions. The first lens group has negative refractive power while the second, third, and fourth groups have positive refractive power, creating a segmented approach to aberration correction that achieves high resolution without requiring aspheric lenses or excessive lens groups
Solution Approach 2:
The patent optimizes the refractive power parameters of each lens group to achieve the desired optical performance. By carefully selecting and adjusting the refractive power values (negative for the first group, positive for the others), the system corrects image aberration and achieves high resolution using only spherical lenses, thereby reducing manufacturing complexity
2Manufacturing precision
If more than four lens groups are used, then high resolution is achieved, but manufacturing cost increases
Solution Approach 1:
The patent employs only spherical lenses throughout the optical system, avoiding the use of expensive aspheric lenses. Spherical lenses are simpler and cheaper to manufacture, and the four lens groups are configured to achieve high resolution performance without requiring costly specialized lens elements
Solution Approach 2:
By optimizing the refractive power parameters across the four lens groups, the system achieves high image resolution using only inexpensive spherical lenses. The specific distribution of refractive powers (negative, then three positive groups) enables effective aberration correction without requiring expensive lens manufacturing techniques
3Manufacturing precision
If aspheric lenses are used, then image distortion is reduced, but manufacturing cost increases
Solution Approach 1:
The patent completely eliminates aspheric lenses from the optical system, using only spherical lenses that are significantly cheaper to manufacture. The four lens groups are designed with specific refractive power combinations that achieve image distortion correction without requiring any aspheric surface manufacturing
Solution Approach 2:
The system achieves distortion correction by optimizing the refractive power parameters of spherical lenses rather than relying on aspheric surface geometry. The specific configuration of negative refractive power in the first group and positive refractive power in the subsequent groups creates effective aberration correction using only inexpensive spherical lens elements
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 high resolution and low image aberration with a reduced number of lenses, eliminating the need for aspheric lenses and lowering production costs, while allowing for true zoom functionality without re-focusing.
Implementation Method 1
The first lens group has a negative refractive power. The second lens group has a positive refractive power. The third lens group has a positive refractive power. The fourth lens group has a positive refractive power.
Data Source
AI summary
A zoom lens includes a first lens group, a second lens group, a third lens group, and a fourth lens group. The first lens group including three lenses is disposed between a magnified side and an reduced side, and the first lens group has a negative refractive power. The second lens group including two lenses is disposed between the first lens group and the reduced side, and the second lens group has a positive refractive power. The third lens group including one lens is disposed between the second lens group and the reduced side, and the third lens group has a positive refractive power. The fourth lens group including seven lenses is disposed between the third lens group and the reduced side, and the fourth lens group has a positive refractive power.