Five-Element Optical Imaging Lens for Mobile Devices

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Solution Overview

Problem

The challenge lies in designing an optical imaging lens for mobile devices with a reduced size while maintaining good optical characteristics, particularly in achieving a shorter length and high view angle, which is complicated by factors such as material nature, production difficulty, and assembly yield.

Innovation Solution

The optical imaging lens is designed with five lens elements, where the convex or concave shape of surfaces and specific inequalities are controlled to shorten the length while maintaining good optical characteristics, including the use of plastic material for the fifth lens element and specific configurations of air gaps and thicknesses to optimize refracting power and aberration correction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Length of moving object

If the size of each element in the optical imaging lens is reduced proportionally, then the overall length of the lens is shortened, but the optical characteristics deteriorate

Engineering Contradiction:

Improvelength of optical imaging lensVSAvoidoptical characteristics

Core Design Contradiction:

Length of moving objectVSReliability

Solution Approach 1:

The patent applies local quality by giving each lens element specific surface shapes (convex or concave) and specific focal length relationships rather than uniform scaling. The first lens element has a convex object-side surface and concave image-side surface, while the second has opposite configuration, with specific focal length ratios that optimize local optical performance while maintaining compact overall length

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes key parameters including the focal lengths of individual lens elements (f1, f2, f3, f4, f5) and their relationships (e.g., |f1|/|f2| within 0.5-2.0), as well as thickness and air gap dimensions, to achieve shortened length while maintaining optical quality. These parameter optimizations allow compact design without proportional scaling

Inventive Principle:

Principle #35Parameter changes

2Length of moving object

If the optical imaging lens is designed with shorter length, then the mobile device size is reduced, but the view angle and aperture size are compromised

Engineering Contradiction:

Improvelength of optical imaging lensVSAvoidview angle and aperture size

Core Design Contradiction:

Length of moving objectVSAdaptability or versatility

Solution Approach 1:

The patent utilizes curved surfaces with specific convex or concave configurations on each lens element to bend light paths efficiently. The aspherical surface designs enable wider view angles and improved aperture utilization within a shorter optical path length, achieving high adaptability without increasing lens length

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The patent divides the optical system into five distinct lens elements with specific refractive powers and surface configurations. This segmentation allows independent optimization of each element's contribution to view angle and aperture performance while maintaining compact overall dimensions

Inventive Principle:

Principle #1Segmentation

3Reliability

If the optical imaging lens is designed with five lens elements and optimized configurations, then the optical characteristics are improved, but the manufacturing complexity and assembly difficulty increase

Engineering Contradiction:

Improveoptical characteristicsVSAvoidproduction difficulty and assembly yield

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent specifies preliminary design constraints including focal length relationships (e.g., |f1|/|f2| within 0.5-2.0, |f3|/|f4| within 0.5-2.0) and dimensional ratios (e.g., T1/G1 within 0.5-2.0) that pre-optimize the optical performance. These preliminary parameter specifications guide manufacturing and assembly processes to achieve good optical characteristics while controlling production complexity

Inventive Principle:

Principle #10Preliminary action

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 configuration effectively shortens the optical imaging lens length, enhances imaging quality, and improves assembly yield by maintaining good optical characteristics and a wide view angle, as demonstrated by various example embodiments with improved longitudinal spherical aberration and astigmatism performance.

Implementation Method 1

each of the first, second, third, fourth and fifth lens elements having refracting power

Methodology Applied

Scientific EffectRefraction: Refraction

Data Source

PatentUS10247914B2Mobile device and optical imaging lens thereof

Publication Date: 2019.04.02 GENIUS ELECTRONICS OPTICAL CO LTD

AI summary

Present embodiments provide for mobile devices and optical imaging lenses thereof. An optical imaging lens may include five lens elements positioned sequentially from an object side to an image side. By controlling the convex or concave shape of the surfaces of the lens elements and designing parameters satisfying at least one inequality, the optical imaging lens may exhibit better optical characteristics and the total length of the optical imaging lens may be shortened.