Compact Imaging Lens System with Aspherical Elements
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Solution Overview
Problem
Small cameras mounted on wireless terminals face challenges in achieving high performance due to limited mounting space, necessitating an optical imaging system that enhances performance without increasing camera size.
Innovation Solution
An imaging lens system comprising 7 or 8 sequentially arranged lenses with specific refractive powers and surface shapes, including aspherical surfaces, to minimize lens length while maintaining image quality, allowing for a chief ray angle of 45° and reduced flange back length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lenses is increased to improve image quality, then image quality is improved, but lens length increases
Solution Approach 1:
The imaging lens system divides the optical system into multiple lens groups (first through seventh lenses) with alternating positive and negative refractive powers. Each lens group performs specific optical functions, allowing the system to achieve high image quality while controlling overall length through distributed optical power management.
Solution Approach 2:
The patent employs aspherical surfaces on multiple lenses (including the seventh lens with at least two inflection points) to change the geometric parameters of the optical elements. This allows for compact lens design with reduced length while maintaining precise optical performance and minimizing aberrations.
2Length of moving object
If lens length is reduced to minimize camera size, then camera size is reduced, but image quality deteriorates
Solution Approach 1:
The imaging lens system uses a dynamic configuration with alternating positive and negative power lens groups that can be optimally arranged to achieve compact length. The seventh lens with inflection points provides dynamic optical control, enabling short focal length design while correcting aberrations to maintain high image quality.
Solution Approach 2:
The system combines multiple lens materials with different refractive indices and dispersion properties to create a composite optical system. This allows for compact design with reduced lens length while achieving superior image quality through material-based aberration correction.
3Length of moving object
If the ratio of lens length to image height is minimized to reduce camera size, then camera size is reduced, but optical performance may be compromised
Solution Approach 1:
The patent introduces inflection points on the seventh lens surface, adding geometric complexity in the radial dimension. This allows the lens to achieve compact axial length while maintaining proper optical performance through sophisticated surface geometry that controls light paths in multiple dimensions.
Solution Approach 2:
The seventh lens with inflection points acts as an intermediary element that mediates between the requirement for short lens length and the need for high optical performance. It serves as a compromise element that enables compact design while correcting aberrations to maintain image 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 solution effectively improves camera performance by minimizing lens length relative to image sensor size, reducing relative illumination, and maintaining aesthetic design integrity, while adjusting lens and image height ratios to enhance image quality.
Implementation Method 1
a first lens having a convex object side surface and having positive refractive power; a second lens on an image side of the first lens, the second lens having a concave image side surface, and having negative refractive power
Data Source
AI summary
An imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, sequentially arranged from an object side of the imaging lens system to an image side of the imaging lens system, wherein a lens length (TTL) of the imaging lens system is a distance from an incident surface of the first lens to an imaging plane on the image side of the imaging lens system, wherein an image height (IH) is a diagonal diameter of an image sensor at the imaging plane on the image side of the imaging lens system, and wherein the lens length (TTL) divided by twice the image height (IH) is less than 0.56.