Five-Element Lens Assembly Aberration Correction

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Solution Overview

Problem

Conventional compact optical systems for mobile terminals struggle to achieve high image quality due to limitations in correcting high-order aberrations and manufacturing complexities, particularly with five-element lens structures that have issues with curvature and interference.

Innovation Solution

A five-element image capturing optical lens assembly with specific refractive powers and surface shapes, including aspheric surfaces and air gaps between lens elements, is designed to improve image quality by correcting aberrations and reducing manufacturing difficulties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If a conventional five-element lens structure is used, then the optical system can be compact, but high-order aberration correction becomes difficult and manufacturing complexity increases

Engineering Contradiction:

Improveoptical system sizeVSAvoidmanufacturing difficulty

Core Design Contradiction:

Volume of moving objectVSEase of manufacture

Solution Approach 1:

The patent applies local quality by designing the fourth lens element with a specific surface configuration: convex on the object side and concave or planar on the image side. This localized curvature design optimizes aberration correction in specific regions while maintaining manufacturability, resolving the contradiction between compact size and manufacturing ease.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent utilizes spheroidality by employing aspheric surfaces with inflection points on the fourth lens element. The inflection point creates a unique curvature transition that effectively corrects high-order aberrations while keeping the overall lens structure compact and manufacturable, addressing both volume constraints and manufacturing feasibility.

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Power

If the fourth lens element has a convex image-side surface, then refractive power can be achieved, but curvature becomes excessively high causing manufacturing issues

Engineering Contradiction:

Improverefractive powerVSAvoidcurvature precision

Core Design Contradiction:

PowerVSManufacturing precision

Solution Approach 1:

The patent inverts the conventional design by making the image-side surface of the fourth lens element concave or planar instead of convex. This inversion reduces the curvature to manageable levels while maintaining the necessary refractive power through the convex object-side surface, thereby resolving the contradiction between power and manufacturing precision.

Inventive Principle:

Principle #13The other way round (Inversion)

3Volume of moving object

If lens elements are arranged compactly, then device size is reduced, but interference and stray light increase degrading image quality

Engineering Contradiction:

Improveoptical system sizeVSAvoidinterference and stray light

Core Design Contradiction:

Volume of moving objectVSObject-generated harmful factors

Solution Approach 1:

The patent introduces an air gap as an intermediary between the fourth lens element and the fifth lens element. This air gap acts as a mediator that prevents direct contact and reduces interference between lens elements while maintaining compact overall dimensions, thereby reducing stray light and improving image quality without sacrificing size reduction.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Volume of moving object

If a five-element lens structure is used, then compact size is achieved, but aberration correction is insufficient for high image quality

Engineering Contradiction:

Improveoptical system sizeVSAvoidimage quality

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The patent applies parameter changes by introducing inflection points on the aspheric surfaces of the fourth lens element and adjusting the curvature radius parameters (R8, R9, R10) and axial distances (T45). These parameter optimizations enable effective aberration correction in a compact five-element structure, resolving the contradiction between size and image quality.

Inventive Principle:

Principle #35Parameter changes

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 effectively corrects aberrations and enhances image quality while simplifying manufacturing, allowing for compact and high-performance optical systems in mobile terminals.

Implementation Method 1

a first lens element with positive refractive power, a second lens element with negative refractive power, a third lens element with refractive power, a fourth lens element with positive refractive power, and a fifth lens element with negative refractive power

Methodology Applied

Scientific EffectRefraction: Refraction

Data Source

PatentUS20150309286A1Image capturing optical lens assembly, image capturing device and mobile terminal

Publication Date: 2015.10.29 LARGAN PRECISION

AI summary

An image capturing optical lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element. The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof. The second lens element has negative refractive power. The third lens element has refractive power. The forth lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof and an image-side surface being concave or planar in a paraxial region thereof. The fifth lens element with negative refractive power has an object-side surface being concave in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof.