Optical Imaging Lens Length Reduction via Aspheric Aberration Control
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Solution Overview
Problem
Current optical imaging lenses face challenges in achieving slimness while maintaining good imaging quality and satisfying market demands for larger aperture and field of view, due to excessive distance from the object side-surface of the first lens element to the imaging plane and inadequate design of aperture value and field of view.
Innovation Solution
The design incorporates a sequence of lens elements with specific refracting powers and surface shapes, including aspheric surfaces and concave/convex regions, arranged to satisfy the condition (G12+G34+G45)/G23≤3.000, reducing lens length while maintaining imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the distance from the object side-surface of the first lens element to the imaging plane is reduced, then the slimness of electronic products is improved, but the imaging quality deteriorates
Solution Approach 1:
The optical lens is divided into eight lens elements with different refracting powers and surface shapes arranged in sequence. Each lens element contributes to correcting specific aberrations, allowing the system to maintain high imaging quality in a compact form factor by distributing optical functions across multiple segmented components rather than relying on a single long optical path.
Solution Approach 2:
The patent employs aspheric surfaces on multiple lens elements (second, third, fourth, fifth, and sixth lens elements have at least one aspheric surface). These curved non-spherical surfaces enable more effective aberration correction in a shorter optical path, allowing the lens to achieve good imaging quality with reduced length compared to conventional spherical lens designs.
2Adaptability or versatility
If the aperture value and field of view are increased, then the market demand is satisfied, but the lens length increases
Solution Approach 1:
Different lens elements are designed with specific local optical properties: the first lens element has positive refracting power with convex object-side and concave image-side surfaces, while subsequent elements have varying combinations of aspheric and spherical surfaces with convex or concave orientations. This localized optimization of optical properties allows each element to contribute efficiently to the overall aperture and field of view performance without requiring increased lens length.
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 reduces the length of the optical imaging lens while achieving good imaging quality and meeting market demands for aperture and field of view, with improved aberration correction and yield rates.
Implementation Method 1
Each of the first lens element through the eighth lens element includes an object-side surface facing the object side and allowing imaging rays to pass through as well as an image-side surface facing the image side and allowing the imaging rays to pass through
Implementation Method 2
At least one of the object-side surface and the image-side surface of the second lens element is an aspheric surface. At least one of the object-side surface and image-side surface of the third lens element is an aspheric surface
Data Source
AI summary
An optical imaging lens including a first lens element to an eighth lens element arranged in sequence from an object side to an image side along an optical axis is provided. A periphery region of the image-side surface of the first lens element is concave. An optical axis region of the object-side surface of the fourth lens element is convex. The sixth lens element has positive refracting power. An optical axis region of the object-side surface of the seventh lens element is convex, and an optical axis region of the image-side surface of the seventh lens element is concave.