Zoom Lens System Aspherical Surface Aberration Correction
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Solution Overview
Problem
The challenge is to create a zoom lens system for digital cameras that is both thin and capable of wide-angle zooming while maintaining image forming performance, as existing systems face difficulties in reducing thickness and increasing the number of lenses leads to sacrificed performance.
Innovation Solution
A zoom lens system comprising a first lens unit with two lens components and a second lens unit with one lens component, featuring aspherical surfaces and a changing space between them during zooming, with specific conditions on the radius of curvature and refractive power distribution to minimize thickness and maximize performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of lenses is increased to maintain image forming performance and correct aberrations, then image quality is improved, but the thickness of the zoom lens system increases
Solution Approach 1:
The patent employs aspherical surfaces on lens components to correct aberrations and maintain image quality without requiring additional lens elements. The aspherical surfaces enable more effective light control, allowing the system to achieve high image forming performance with a reduced number of lenses, thereby decreasing the overall thickness of the zoom lens system.
2Length of stationary object
If the number of lenses is decreased to reduce thickness, then the thickness of the zoom lens system is reduced, but image forming performance deteriorates
Solution Approach 1:
The patent utilizes aspherical parameters and specific refractive index variations to optimize the optical performance of each lens component. By carefully designing the aspherical surface parameters and material properties, the system achieves effective aberration correction and maintains high image forming performance even with a reduced number of lens elements, thus preventing performance deterioration when thickness is reduced.
3Length of stationary object
If a positive lens is placed closest to the object side to reduce thickness, then the thickness is reduced, but aberration correction becomes difficult
Solution Approach 1:
The patent employs composite lens structures where a positive lens component with a specific refractive index (Nd≥2.0) is combined with negative lens components. This composite arrangement allows the positive lens to be positioned at the object side for thickness reduction while the negative components effectively correct the introduced aberrations, achieving both thickness reduction and maintained aberration correction capability.
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 allows for a compact, lightweight zoom lens system that maintains image quality across the zoom range, effectively reducing thickness while ensuring high image forming performance and correcting aberrations.
Implementation Method 1
a first lens unit including two lens components; and a second lens unit including one lens component, the number of the lens components included in the first lens unit and the second lens unit being three in total
Data Source
AI summary
A zoom lens system comprising, in order from an object side: a first lens unit comprising two lens components; and a second lens unit comprising one lens component, during zooming, a space between the first lens unit and the second lens unit changing, the first lens unit and the second lens unit having aspherical surfaces, at least one aspherical surface of the first lens unit satisfying the following condition: R1/hl 1.35, wherein R1 denotes a paraxial radius of curvature of the at least one aspherical surface, and hi denotes a length from a first intersection between a chief ray reaching a point of maximum image height on an image surface and the at least one aspherical surface to an optical axis in the wide-angle end at a time when the chief ray enters the zoom lens system with an angle of incidence equal to or larger than 36 degrees.