5-Lens Imaging System with Movable Element for Auto Focus

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Solution Overview

Problem

Conventional 5-piece lens systems for camera modules often fail to achieve satisfactory optical properties and aberration correction, leading to a need for a compact zoom-type imaging lens with high resolution and high power structure.

Innovation Solution

A compact zoom-type imaging lens configuration comprising a first movable lens with positive refractive power, a concave second lens with negative refractive power, a meniscus-shaped third lens, a meniscus-shaped fourth lens, and a fifth lens with negative refractive power, optimized by specific focal length, air clearance, and refractive index conditions to enable auto focusing and high resolution imaging.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a 5-piece lens system is used for compactness and low cost, then the device size and manufacturing cost are reduced, but the optical properties and aberration correction become insufficient

Engineering Contradiction:

Improvelens system structureVSAvoidoptical properties

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The patent applies local quality by giving each lens element specific asymmetric shapes and inflection points tailored to its position in the optical system. The first lens has an asymmetric shape with inflection points on specific surfaces, the second lens has different curvature radii ratios, and subsequent lenses have customized geometries. This localized optimization of each element's quality enables the 5-piece system to achieve high-resolution imaging and aberration correction comparable to more complex systems.

Inventive Principle:

Principle #3Local quality

2Manufacturing precision

If lenses are designed with specific inflection points and asymmetric shapes to improve resolution, then optical performance is enhanced, but manufacturing complexity increases

Engineering Contradiction:

ImproveresolutionVSAvoidlens fabrication

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The patent segments the optical system into 5 distinct lens elements, each with specific asymmetric shapes and inflection points. By dividing the optical function across multiple specialized elements rather than requiring one highly complex lens, the manufacturing complexity is distributed and managed more effectively. Each element's asymmetric geometry is optimized for its specific role in correcting particular aberrations, making the overall system manufacturable despite the complexity of individual elements.

Inventive Principle:

Principle #1Segmentation

3Adaptability or versatility

If a compact zoom-type design is implemented with auto focusing capability, then functionality is enhanced, but the lens structure becomes more complex

Engineering Contradiction:

Improvezoom and auto focus functionVSAvoidlens structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent implements dynamics by making the first lens movable to enable auto-focusing functionality. The first lens element can shift position along the optical axis to adjust focus for different object distances. This dynamic element, combined with the zoom capability achieved through the specific 5-piece configuration and inflection point design, provides versatile functionality while maintaining a relatively compact structure compared to traditional designs.

Inventive Principle:

Principle #15Dynamics

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 enables auto focusing and achieves a compact, high-resolution imaging lens with improved optical performance by moving one lens, correcting aberrations and maintaining high resolution across zoom positions.