Wide-Angle Imaging Lens with Aspheric Surfaces for 180° View

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Solution Overview

Problem

Existing wide-angle imaging lenses struggle to achieve a maximum angle of view exceeding 150° while maintaining a small size and lightweight configuration without increasing the number of lenses, and effectively correcting chromatic aberrations.

Innovation Solution

A wide-angle imaging lens design using six lenses, with specific refractive power relationships and lens shapes, including a first lens group with a negative meniscus and biconcave lenses, and a second lens group with biconvex lenses, optimized to correct axial and lateral chromatic aberrations, and featuring aspheric surfaces to enhance resolution and reduce weight.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the number of lenses is increased to achieve a wider angle of view exceeding 150°, then the angle of view is improved, but the device size and weight increase

Engineering Contradiction:

Improveangle of viewVSAvoidlens weight

Core Design Contradiction:

Adaptability or versatilityVSWeight of moving object

Solution Approach 1:

The patent applies aspheric surfaces to lens elements, fundamentally changing the geometric parameters of the lenses. This allows each lens to provide greater optical power and aberration correction capability, enabling a wider angle of view without proportionally increasing the number of lens elements, thus avoiding excessive weight increase.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs cemented lens groups combining materials with different Abbe numbers (high dispersion and low dispersion materials). This composite approach corrects chromatic aberrations effectively, allowing the use of fewer lens elements to achieve the same optical performance, thereby reducing overall lens weight while maintaining wide angle capability.

Inventive Principle:

Principle #40Composite materials

2Adaptability or versatility

If the number of lenses is increased to achieve a wider angle of view exceeding 150°, then the angle of view is improved, but the device size increases

Engineering Contradiction:

Improveangle of viewVSAvoidlens length

Core Design Contradiction:

Adaptability or versatilityVSLength of moving object

Solution Approach 1:

By introducing aspheric surfaces with specific curvature variations, the patent achieves higher refractive power per lens element. This allows the optical system to achieve a super-wide angle of view exceeding 150° without proportionally increasing the overall lens length, as each element contributes more effectively to the total optical power.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent extensively uses aspheric surfaces instead of simple spherical surfaces. These curved surfaces with varying radii of curvature enable more compact lens designs by achieving the required optical path folding and image formation within a shorter axial distance, thus reducing lens length while maintaining wide angle performance.

Inventive Principle:

Principle #14Spheroidality (Curvature)

3Reliability

If cemented lenses are used to correct chromatic aberration, then optical performance is improved, but manufacturing complexity increases

Engineering Contradiction:

Improveoptical performanceVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent applies aspheric surfaces selectively to specific lens elements rather than all elements. This localized application of complex manufacturing techniques to only where needed (at critical positions in the optical path) maintains optical performance while reducing overall manufacturing complexity compared to making all lenses aspheric.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent uses cemented lens groups with carefully selected material combinations (high and low dispersion materials). This composite material approach corrects chromatic aberration effectively while using conventional cementing techniques that are well-established in manufacturing, balancing optical performance with manufacturability.

Inventive Principle:

Principle #40Composite materials

4Reliability

If aspheric surfaces are used to enhance resolution and reduce weight, then optical performance is improved, but manufacturing precision requirements increase

Engineering Contradiction:

Improveoptical performanceVSAvoidsurface precision

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent applies aspheric surfaces to specific lens elements at critical positions in the optical path rather than uniformly to all elements. This localized approach concentrates the manufacturing precision requirements at key locations where they provide maximum optical benefit, while other elements can be manufactured with more relaxed tolerances.

Inventive Principle:

Principle #3Local quality

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 design achieves a super-wide angle of view exceeding 180° with improved optical performance, size reduction, and weight minimization, effectively correcting aberrations and providing high-resolution imaging suitable for surveillance and on-vehicle applications.