Eight-Lens Optical Imaging System for Compact Mobile Devices
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Solution Overview
Problem
Optical imaging lenses face challenges in achieving a balance between good imaging quality, compactness, slimness, small f-number, and large field of view, particularly in mobile devices and vehicles, where the increasing number of lenses complicates design and increases system length.
Innovation Solution
The design of an optical imaging lens comprising specific arrangements of lens elements with positive and negative refracting power, concave and convex surface regions, and optimized air gaps and thicknesses, satisfying conditional expressions to achieve a compact system with improved imaging quality and field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of optical lenses is increased to correct aberration and dispersion problems, then imaging quality is improved, but system length is increased
Solution Approach 1:
The optical system is divided into eight lens elements with alternating positive and negative refractive powers, where each lens element contributes to correcting specific aberrations. The segmentation allows distributed correction of optical defects across multiple components rather than requiring fewer, larger lenses, thereby improving imaging quality while managing system length through optimized individual element contributions.
Solution Approach 2:
The patent applies parameter changes by specifying alternating refractive power signs (+−++−−+− or +−+−−−+− or +−+−+−+− or +−+−−++−), controlling relative focal lengths, and optimizing air gap distances between lens elements. These parameter optimizations enable compact arrangement of eight lens elements, correcting aberrations effectively while maintaining a reduced system length suitable for mobile devices.
2Measurement precision
If the number of optical lenses is increased to correct aberration and dispersion problems, then imaging quality is improved, but device complexity is increased
Solution Approach 1:
The optical system is divided into eight lens elements with alternating positive and negative refractive powers, where each lens element contributes to correcting specific aberrations. The segmentation allows distributed correction of optical defects across multiple components rather than requiring fewer, larger lenses, thereby improving imaging quality while managing system length through optimized individual element contributions.
Solution Approach 2:
The patent applies parameter changes by specifying alternating refractive power signs (+−++−−+− or +−+−−−+− or +−+−+−+− or +−+−−++−), controlling relative focal lengths, and optimizing air gap distances between lens elements. These parameter optimizations enable compact arrangement of eight lens elements, correcting aberrations effectively while maintaining a reduced system length suitable for mobile devices.
3Illumination intensity
If the f-number is reduced to enhance luminous flux, then light gathering ability is improved, but aberration control becomes more difficult
Solution Approach 1:
The patent applies parameter changes by specifying alternating refractive power signs (+−++−−+− or +−+−−−+− or +−+−+−+− or +−+−−++−), controlling relative focal lengths, and optimizing air gap distances between lens elements. These parameter optimizations enable compact arrangement of eight lens elements, correcting aberrations effectively while maintaining a reduced system length suitable for mobile devices.
Solution Approach 2:
The patent converts the challenge of reduced f-number (which typically increases aberrations) into an opportunity by using the compact lens arrangement to their advantage. The alternating positive and negative power lenses work together to correct aberrations that would normally be exacerbated by low f-number designs, thereby achieving both high luminous flux and good aberration control simultaneously.
4Adaptability or versatility
If the field of view is expanded to meet market requirements, then viewing capability is improved, but optical design complexity is increased
Solution Approach 1:
The patent applies parameter changes by specifying alternating refractive power signs (+−++−−+− or +−+−−−+− or +−+−+−+− or +−+−−++−), controlling relative focal lengths, and optimizing air gap distances between lens elements. These parameter optimizations enable compact arrangement of eight lens elements, correcting aberrations effectively while maintaining a reduced system length suitable for mobile devices.
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 the optical imaging lens to achieve good imaging quality, a small f-number, short system length, and a large field of view, while reducing spherical and chromatic aberrations, thus addressing the design challenges of conventional lenses.
Implementation Method 1
Each of the first lens element to the eighth lens element includes an object-side surface facing the object side and allowing imaging rays to pass through and an image-side surface facing the image side and allowing the imaging rays to pass through
Data Source
AI summary
An optical imaging lens includes a first, a second, a third, a fourth, a fifth, a sixth, a seventh, and an eighth lens elements sequentially arranged on an optical axis from an object side to an image side. Each of the first lens element to the eighth lens element includes an object-side surface facing the object side and allowing imaging rays to pass through and an image-side surface facing the image side and allowing the imaging rays to pass through. The first lens element has positive refracting power. The second lens element has negative refracting power. An optical axis region of an object-side surface of the fifth lens element is concave. An optical axis region of an object-side surface of the sixth lens element is convex. An optical axis region of an image-side surface of the seventh lens element is convex.