Seven-Element Optical Imaging Lens with Concave Surfaces
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Solution Overview
Problem
The challenge lies in designing an optical imaging lens that achieves good imaging quality and miniaturization while expanding the field of view, which is complicated by manufacturing issues and technical difficulties in producing lenses with high refracting power and compact size.
Innovation Solution
The optical imaging lens is designed with a specific arrangement of seven lens elements, featuring concave and convex curved surfaces, where the Abbe number condition V1−(V3+V4)≥−10.000 is satisfied, allowing for improved optical properties and a larger half field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the lens size is reduced to achieve miniaturization, then the device becomes more compact, but the imaging quality deteriorates
Solution Approach 1:
The optical lens is divided into seven separate lens elements (first through seventh lens elements) with different refracting powers and surface configurations. This segmentation allows each element to contribute differently to the overall optical performance, enabling compact size while maintaining imaging quality through coordinated action of multiple elements rather than relying on a single large lens.
Solution Approach 2:
Different lens elements have different Abbe numbers (V1, V3, V4) and different surface curvature configurations (convex/concave regions). The first lens element has positive refracting power with specific convex/concave regions, while the third and fourth elements have negative refracting power. This local differentiation of optical properties allows optimization of each region's contribution to imaging quality within the compact structure.
2Adaptability or versatility
If the field of view is expanded, then the imaging coverage increases, but the lens complexity increases
Solution Approach 1:
The lens elements feature asymmetric convex and concave surface configurations that dynamically adapt light paths from different angles. The object-side and image-side surfaces of each lens element have different curvature characteristics, enabling the system to handle a wider range of incident angles while maintaining control over optical performance without requiring excessive additional elements.
Solution Approach 2:
Multiple lens elements with different functions are nested along the optical axis in a compact arrangement. The first lens element with positive power is followed by second, third, and fourth elements with negative power, creating a nested configuration where each element contributes to field expansion while the overall structure remains compact and integrated.
3Manufacturing precision
If the refracting power is increased to improve imaging quality, then the optical performance improves, but the manufacturing difficulty increases
Solution Approach 1:
The patent specifies particular parameter ranges including the Abbe number relationship V1−(V3+V4)≥−10.000 and the arrangement of convex/concave regions on each lens element. These parameter constraints optimize the distribution of refracting power across multiple elements rather than concentrating it in one element, which reduces the manufacturing difficulty of each individual element while achieving high overall imaging 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
This design achieves good optical performance and expands the field of view by controlling the concave-convex surface arrangement, enhancing imaging quality and manufacturing feasibility.
Implementation Method 1
Each of the lens elements includes an object-side surface facing the object side and allowing an imaging ray to pass through and an image-side surface facing the image side and allowing the imaging ray to pass through
Data Source
AI summary
An optical imaging lens including a first to a seventh lens elements arranged in sequence from an object side to an image side along an optical axis is provided. Each lens element includes an object-side surface and an image-side surface. An optical axis region of the image-side surface of the first lens element is concave. An optical axis region of the object-side surface of the third lens element is concave. The fourth lens element has positive refracting power and an optical axis region of the image-side surface of the fourth lens element is concave. An optical axis region of the image-side surface of the fifth lens element is concave. Furthermore, other optical imaging lenses are also provided.