Six-Lens Optical System Aberration Control via Refractive Power Segmentation

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Solution Overview

Problem

Conventional optical systems with four or five lenses in portable electronic devices fail to achieve high-end camera performance while maintaining a slim size, as they struggle to meet modern optical and aberration characteristics.

Innovation Solution

A slim, low F-number image capturing optical system with six lenses, including positive and negative refractive power lenses, is designed to optimize optical characteristics and minimize aberrations by specific lens arrangements and focal length ratios, ensuring high resolution and performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional optical systems with four or five lenses are used, then the device size is reduced, but the optical performance and aberration characteristics deteriorate

Engineering Contradiction:

Improveoptical performanceVSAvoidnumber of lenses

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The optical system is divided into six distinct lens elements with specific positive and negative refractive powers arranged in a predetermined sequence. This segmentation allows each lens to be optimized for specific aberration correction, achieving high optical performance while managing system complexity through functional division.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Each lens element is designed with specific local optical properties including varying refractive powers, curvature radii, and thicknesses. The fifth lens specifically includes inflection points on its object-side surface to locally correct aberrations. This local quality optimization enables the system to achieve superior optical characteristics without proportionally increasing overall complexity.

Inventive Principle:

Principle #3Local quality

2Reliability

If the number of lenses is increased to six, then optical performance improves, but the device size increases

Engineering Contradiction:

Improveaberration characteristicsVSAvoidoptical system length

Core Design Contradiction:

ReliabilityVSLength of stationary object

Solution Approach 1:

The patent specifies precise parameter ranges for the optical system including focal length ratios (0.27 < f2/f3 < 0.65, 0.95 < f/f2 < 1.30), curvature radii relationships (r1/r2, r4/r5), and thickness ratios (0.15 < CT5/CT4 < 0.40). These parameter optimizations enable compact lens design that achieves superior aberration correction while controlling the overall optical system length.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent controls not only the axial length but also the radial dimensions and spacing between lens elements. By optimizing the three-dimensional arrangement including air gaps and lens diameters, the system achieves compact form factor while maintaining six lens elements for high optical performance.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Reliability

If F-number is reduced for better light gathering, then image quality improves, but aberrations increase

Engineering Contradiction:

Improveimage qualityVSAvoidaberrations

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent converts the potential harm of reduced F-number (which typically increases aberrations) into a benefit by strategically designing the sixth lens with negative refractive power and convex upward configuration. This lens element specifically counteracts the aberrations introduced by the low F-number design, allowing the system to achieve both high light gathering capability and superior image quality.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The optical system uses a composite arrangement of six lens elements with alternating positive and negative refractive powers. This composite structure combines different optical materials and designs to achieve low F-number performance while correcting chromatic and spherical aberrations through the complementary properties of individual lens elements.

Inventive Principle:

Principle #40Composite materials

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 six-lens optical system achieves high-resolution image capturing with reduced size, effectively addressing the limitations of conventional systems by optimizing lens arrangements and focal length ratios, thereby enhancing optical performance and reducing aberrations.

Implementation Method 1

a first lens having positive refractive power and being concave upwards, a second lens having positive refractive power, a third lens having negative refractive power, a fourth lens having positive refractive power, a fifth lens having positive refractive power and including at least one inflection point on the object side or an upper surface, and a sixth lens having negative refractive power and being convex upwards

Methodology Applied

Scientific EffectRefraction: Refraction

Data Source

PatentUS10401592B2Image capturing optical system

Publication Date: 2019.09.03 SAMSUNG ELECTRONICS CO LTD

AI summary

Disclosed is an image capturing optical system including, in order from an object side, a first lens having positive refractive power and concave upwards, a second lens having positive refractive power, a third lens having negative refractive power, a fourth lens having positive refractive power, a fifth lens having positive refractive power and including at least one inflection points on the object side or an upper surface, and a sixth lens having negative refractive power and being convex upwards.