Negative-First Six-Element Lens Assembly for Compact Wide-Angle Imaging

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Solution Overview

Problem

Conventional optical systems struggle to achieve a balance between wide field of view and compact size, as they either fail to gather light effectively due to strong positive refractive power or increase total track length with negative refractive power, making it difficult to meet high-end specifications in miniaturized devices.

Innovation Solution

An optical imaging lens assembly with six lens elements, featuring negative refractive power for the first lens, aspheric surfaces, and specific curvature radius conditions to optimize light gathering and aberration correction, allowing for a wide field of view and compact design.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Length of moving object

If the first lens element has strong positive refractive power to achieve compactness, then the total track length is reduced, but light from large field of view cannot travel into the optical system

Engineering Contradiction:

Improvetotal track lengthVSAvoidfield of view

Core Design Contradiction:

Length of moving objectVSAdaptability or versatility

Solution Approach 1:

The patent inverts the conventional design by giving the first lens element negative refractive power instead of positive, which enables wide field of view light gathering while maintaining compact size through subsequent lens elements with positive refractive power that fold the optical path

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent changes the refractive power parameter of the first lens element from positive to negative, and optimizes the curvature radii parameters of multiple lens surfaces to achieve both wide field of view and compact total track length simultaneously

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If the first lens element has negative refractive power to achieve wide field of view, then light gathering is improved, but the total track length is increased

Engineering Contradiction:

Improvefield of viewVSAvoidtotal track length

Core Design Contradiction:

Adaptability or versatilityVSLength of moving object

Solution Approach 1:

The patent divides the optical system into six distinct lens elements with alternating positive and negative refractive powers, where the first element gathers wide field light and subsequent elements with positive power compress the overall track length

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent creates a composite optical system combining lens elements with different refractive powers and aspheric surfaces, where the combination of negative and positive power elements achieves both wide field of view and compact size

Inventive Principle:

Principle #40Composite materials

3Length of moving object

If conventional optical systems are miniaturized to reduce device size, then compactness is achieved, but image quality and aperture are compromised

Engineering Contradiction:

Improvedevice sizeVSAvoidimage quality

Core Design Contradiction:

Length of moving objectVSManufacturing precision

Solution Approach 1:

The patent employs aspheric surfaces on multiple lens elements instead of simple spherical surfaces, enabling better aberration correction and higher image quality in a miniaturized configuration with six elements

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The patent optimizes multiple parameters including curvature radii ratios, refractive powers, and aspheric coefficients to achieve high image quality and large aperture in a compact miniaturized form factor

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 enables a wide-angle lens configuration with a large aperture, improving image quality and reducing the total track length, suitable for compact devices with high image quality and low-light performance.

Implementation Method 1

The object-side surface and the image-side surface of the sixth lens element are both aspheric

Methodology Applied

Scientific EffectRefraction: Refraction

Data Source

PatentUS12416791B2Optical imaging lens assembly, image capturing unit and electronic device

Publication Date: 2025.09.16 LARGAN PRECISION

AI summary

An optical imaging lens assembly includes, in order from an object side to an image side: a first, a second, a third, a fourth, a fifth and a sixth lens elements. The first lens element has negative refractive power. The second lens element has an object-side surface being concave in a paraxial region thereof. The third lens element has an object-side surface being convex in a paraxial region thereof. The fifth lens element with negative refractive power has an object-side surface being concave and an image-side surface being convex in a paraxial region thereof. The sixth lens element has an image-side surface being concave in a paraxial region thereof. At least one of an object-side surface and the image-side surface of the sixth lens element has at least one critical point in an off-axis region thereof, wherein both the surfaces of the sixth lens element are aspheric.