Five-Element Imaging Lens System for Compact High-Quality Capture

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Solution Overview

Problem

Conventional telephoto optical systems are bulky, expensive, and fail to meet consumer demands for miniaturization and high image quality, especially in compact electronic devices.

Innovation Solution

A miniaturized imaging lens system comprising five lens elements with specific refractive powers and aspheric surfaces, including a first positive lens element, a second negative lens element, a third lens element with balanced refractive power, a fourth negative lens element, and a fifth negative lens element, optimized with air gaps and an aperture stop configuration to achieve compactness and high image quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional multi-element telephoto optical systems are used, then image quality can be maintained, but the system becomes bulky and expensive

Engineering Contradiction:

Improveimage qualityVSAvoidlens assembly size

Core Design Contradiction:

Manufacturing precisionVSVolume of moving object

Solution Approach 1:

The optical system is divided into five distinct lens elements with specific refractive powers (first positive, second negative, third positive, fourth negative, fifth positive), allowing each element to contribute differently to image formation and aberration correction, achieving high image quality in a compact configuration

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Aspheric surfaces are employed on multiple lens elements (specifically the third, fourth, and fifth elements have aspheric image-side surfaces), enabling better control of light rays and reduction of spherical aberration, which allows for a more compact design while maintaining image quality

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Manufacturing precision

If conventional glass lens elements with spherical surfaces are used, then optical performance can be achieved, but the product price increases

Engineering Contradiction:

Improveoptical performanceVSAvoidmanufacturing cost

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The patent specifies precise parameter ranges for lens element powers, axial distances, and aspheric coefficients (e.g., -0.6 < (R6-R8)/(R6+R8) < -0.1, 0.3 < T3/T4 < 0.8) that optimize both optical performance and manufacturability, balancing performance requirements with manufacturing feasibility

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The system uses a combination of plastic lens elements with different refractive indices and Abbe numbers (e.g., first element: 1.53<N1<1.65, 30<V1<60; third element: 1.60<N3<1.70, 20<V3<40), allowing cost-effective plastic materials to replace expensive glass while maintaining optical performance through careful material selection and design optimization

Inventive Principle:

Principle #40Composite materials

3Volume of moving object

If the number of lens elements is reduced for miniaturization, then portability improves, but image quality may deteriorate

Engineering Contradiction:

Improvelens system sizeVSAvoidimage quality

Core Design Contradiction:

Volume of moving objectVSManufacturing precision

Solution Approach 1:

The patent incorporates an aperture stop that can be moved along the optical axis to adjust the effective focal length and field of view, providing dynamic functionality that allows a compact five-element system to deliver variable optical performance suitable for different shooting scenarios

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

Complex mechanical lens assemblies are replaced with a streamlined five-element design where aspheric surfaces and precise spacing (e.g., 0.1<SD/TD<0.95) substitute for additional lens elements, achieving miniaturization without sacrificing image quality

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 proposed imaging lens system achieves a compact design that increases portability, reduces manufacturing costs, and provides high image quality, making it suitable for a wide range of applications in electronic devices.

Implementation Method 1

an imaging lens system includes, in order from an object side to an image side: 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 refractive power, and a fifth lens element with negative refractive power

Methodology Applied

Scientific EffectRefraction: Refraction

Data Source

PatentUS12204173B2Imaging lens system, image capturing device and electronic device

Publication Date: 2025.01.21 LARGAN PRECISION

AI summary

This disclosure provides an imaging lens system including, in order from an object side to an image side: a first lens element with positive refractive power having an object-side surface being convex in a paraxial region thereof; a second lens element with negative refractive power; a third lens element with refractive power, wherein an object-side surface and an image-side surface thereof are aspheric; a fourth lens element with refractive power, wherein an object-side surface and an image-side surface thereof are aspheric; and a fifth lens element with negative refractive power having an object-side surface being concave in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof, which are both aspheric. The imaging lens system is further provided with an aperture stop, and there is no lens element with refractive power disposed between the aperture stop and the first lens element.