Zoom Lens System Aberration Correction via Four-Group Segmentation

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Solution Overview

Problem

The challenge lies in creating a small-sized lens system that achieves high optical performance and high resolution while maintaining low manufacturing costs, as existing systems struggle to correct aberrations on the peripheral portion of the screen effectively.

Innovation Solution

A zoom lens system comprising four lens groups with specific refractive powers and configurations, including a first lens group with positive refractive power, a second lens group with negative refractive power, a third lens group with positive refractive power, and a fourth lens group with negative refractive power, where the zooming operation is performed by moving the second and fourth lens groups, and the fourth lens group includes a cemented lens and an independent lens with aspherical surfaces, optimizing focal lengths and Abbe's numbers to minimize aberrations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If a small sized lens system is manufactured, then the apparatus size is reduced for convenience, but manufacturing costs increase and optical performance deteriorates

Engineering Contradiction:

Improvelens system sizeVSAvoidmanufacturing cost

Core Design Contradiction:

Volume of moving objectVSEase of manufacture

Solution Approach 1:

The lens system is divided into four distinct lens groups with specific refractive powers (positive, negative, positive, negative). This segmentation allows each group to be optimized independently for specific functions while achieving high magnification and resolution in a compact configuration, resolving the contradiction between small size and manufacturing feasibility

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies specific parameter conditions including 0.251/ft ≤ f1, 1.02/fw ≤ f2, and precise ratios involving Abbe's numbers (V21+V23)/V22 and VT4. By optimizing these parameters, the system achieves high optical performance in a compact form factor while maintaining manufacturability through standardized optical design principles

Inventive Principle:

Principle #35Parameter changes

2Volume of moving object

If a small sized lens system is manufactured, then the apparatus size is reduced for convenience, but optical performance deteriorates

Engineering Contradiction:

Improvelens system sizeVSAvoidoptical performance

Core Design Contradiction:

Volume of moving objectVSManufacturing precision

Solution Approach 1:

The fourth lens group incorporates a cemented lens combined with an independent lens having at least one aspherical surface. This local quality enhancement in the fourth group specifically addresses peripheral aberration correction while maintaining the compact overall size, achieving high resolution without increasing the entire lens system volume

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The use of aspherical surfaces in the fourth lens group (independent lens with at least one aspherical surface) enables effective correction of aberrations on the peripheral portion of the screen. The aspherical curvature provides superior aberration control compared to spherical surfaces, maintaining high optical performance in a compact design

Inventive Principle:

Principle #14Spheroidality (Curvature)

3Manufacturing precision

If aberration correction is improved, then optical performance increases, but device complexity increases

Engineering Contradiction:

Improveaberration correctionVSAvoidlens group configuration

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The fourth lens group merges a cemented lens with an independent lens having aspherical surfaces into a single functional unit. This combination achieves effective aberration correction (particularly peripheral aberration) while maintaining a relatively simple overall structure, avoiding excessive complexity in the lens configuration

Inventive Principle:

Principle #5Merging (Combining)

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 zoom lens system to achieve high magnification and resolution from wide-angle to telephoto ends while being miniaturized, effectively correcting chromatic and spherical aberrations, thus meeting the demands for both high optical performance and cost-effectiveness.

Implementation Method 1

a first lens group having a positive refractive power; a second lens group having a negative refractive power; a third lens group having a positive refractive power; and a fourth lens group having a negative refractive power

Methodology Applied

Scientific EffectRefraction: Refraction

Implementation Method 2

The fourth lens group may include a cemented lens and an independent lens having at least one aspherical surface

Methodology Applied

Scientific EffectSpherical aberration correction:

Implementation Method 3

effectively correcting chromatic and spherical aberrations

Methodology Applied

Scientific EffectChromatic aberration correction:

Data Source

PatentUS9128274B2Zoom lens system

Publication Date: 2015.09.08 HANWHA VISION CO LTD

AI summary

Provided is a zoom lens system including: a first lens group having a positive refractive power; a second lens group having a negative refractive power; a third lens group having a positive refractive power; and a fourth lens group having a negative refractive power sequentially from an object side to an image side, wherein a zooming operation is performed by moving the second lens group and the fourth lens group.