Eight-Lens Optical System with Alternating Refractive Powers

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Solution Overview

Problem

Conventional image capturing devices face challenges in maintaining stable image quality and ultra-wide viewing angles due to environmental factors, such as changes in refractive index, which reduce resolution and viewing angle, making it difficult to achieve high-quality images in compact and lightweight forms.

Innovation Solution

The optical lens design comprises a specific arrangement of eight lenses with varying refractive powers and surface curvatures, including a first lens with negative refractive power and a stop to control light, allowing for a large aperture size and field of view while maintaining low distortion and compact volume.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If the viewing angle is increased to achieve ultra-wide photography, then the field of view is improved, but the resolution is lowered due to environmental refractive index changes

Engineering Contradiction:

Improvefield of viewVSAvoidresolution

Core Design Contradiction:

Area of stationary objectVSMeasurement precision

Solution Approach 1:

The patent applies the counterweight principle by introducing a specific lens configuration with eight lenses having alternating positive and negative refractive powers. This configuration counteracts the harmful effects of environmental refractive index changes on resolution, allowing the system to maintain stable image quality even when operating at ultra-wide viewing angles.

Inventive Principle:

Principle #8Anti-weight (Counterweight)

Solution Approach 2:

The patent utilizes parameter changes by carefully selecting and optimizing the refractive powers, curvature radii, and spacing of the eight lenses. By adjusting these optical parameters, the system achieves a balance between maintaining ultra-wide field of view and preserving resolution stability under varying environmental conditions.

Inventive Principle:

Principle #35Parameter changes

2Volume of moving object

If the total length is reduced to achieve compact device size, then the volume is decreased, but the optical performance deteriorates

Engineering Contradiction:

Improvedevice volumeVSAvoidoptical performance

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The patent applies the nesting principle by arranging eight lenses with alternating positive and negative refractive powers in a compact sequence. This nested configuration allows the optical system to achieve ultra-wide viewing angles and maintain stable performance while minimizing the total length and volume of the device.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The patent divides the optical system into eight distinct lens elements with specific refractive power assignments. This segmentation allows each lens to contribute to the overall optical performance, enabling the system to achieve compact size without sacrificing image quality or stability.

Inventive Principle:

Principle #1Segmentation

3Area of stationary object

If the aperture size is increased to improve light gathering, then the field of view is improved, but the distortion increases

Engineering Contradiction:

Improveaperture sizeVSAvoiddistortion

Core Design Contradiction:

Area of stationary objectVSShape

Solution Approach 1:

The patent applies the dynamics principle by designing an optical system where the eight lenses work together to dynamically correct aberrations across the aperture. The alternating positive and negative refractive powers create a balanced system that maintains low distortion even with large aperture size, enabling both improved light gathering and accurate image formation.

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

This design achieves low distortion, large aperture size, and field of view with a compact volume, ensuring stable image quality and high resolution across varying environmental conditions, suitable for applications like handheld cameras and surveillance systems.

Implementation Method 1

The optical lens, in order from an object side to an image-forming side, includes: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens. The first lens has negative refractive power, the second lens has refractive power, the third lens has positive refractive power, the fourth lens has positive refractive power, the fifth lens has negative refractive power, the sixth lens has positive refractive power, the seventh lens has positive refractive power, and the eighth lens has negative refractive power.

Methodology Applied

Scientific EffectRefraction: Refraction

Data Source

PatentUS11231565B2Optical lens comprising eight lenses of −−++−++− refractive powers

Publication Date: 2022.01.25 ABILITY ENTERPRISE CO LTD

AI summary

An optical lens, in order from an object side to an image-forming side, includes: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens, respectively having negative, negative, positive, positive, negative, positive, positive and negative refractive power. The curvature radius of the object-side surface of the first lens is greater than the curvature radius of the image-side surface of the first lens; the image-side surface of the eighth lens has an effective radius r and a vertex point, H is a distance between the vertex point and the optical axis, the image-side surface of the eighth lens intersects with the optical axis at an intersection point, d is a distance between a projected position of the vertex point on the optical axis and the intersection point, and |r/d|≤30 and/or |r/H|≤2.