Optical Imaging Lens Shortening via Aperture Nesting
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Solution Overview
Problem
Designing an optical imaging lens with a shorter length while maintaining good optical characteristics and a wide view angle is challenging, especially for lenses with six elements, due to factors like material nature and production difficulty.
Innovation Solution
The optical imaging lens is designed by controlling the convex or concave shape of its surfaces and satisfying specific inequalities, such as SL/TTL≤0.75 and TTL/(T3+G34)≤7.3, to shorten the length while maintaining good optical characteristics and system functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of lens elements is increased to improve optical characteristics, then imaging quality is improved, but the length of the optical imaging lens increases
Solution Approach 1:
The patent applies nesting by placing the aperture stop within the bundle of lens elements rather than at the extreme ends. Specifically, the aperture stop is positioned between the third and fourth lens elements, allowing the optical components to be nested more compactly along the optical axis. This arrangement reduces the overall length TTL while maintaining six lens elements for good optical characteristics, resolving the contradiction between imaging quality and lens length.
Solution Approach 2:
The patent optimizes the spatial distribution of lens elements and the aperture stop in multiple dimensions. By controlling the axial positions (along the optical axis) and radial positions (aperture locations) of each component, the design achieves compact length while maintaining effective optical paths. The specific positioning of the aperture stop at distance TA from the object-side surface of the third lens element creates an optimized three-dimensional arrangement that reduces length without sacrificing optical performance.
2Length of moving object
If the length of the optical imaging lens is shortened to reduce device size, then device size is reduced, but optical characteristics deteriorate
Solution Approach 1:
The patent employs parameter changes by establishing specific mathematical relationships between the positions and dimensions of lens elements. The inequalities SL/TTL≤0.75 and TA/(T3+G34)≤7.3 define optimized parameter ranges that maintain good optical characteristics even with shortened length. By controlling the ratio of effective focal length to total length and the position of the aperture stop relative to lens thickness and air gaps, the design achieves compact dimensions without optical performance degradation.
3Adaptability or versatility
If the aperture stop is positioned closer to the object side to increase view angle, then view angle is improved, but the length of the optical imaging lens increases
Solution Approach 1:
The patent applies preliminary action by pre-positioning the aperture stop at an optimized location before final assembly. The aperture stop is placed at a specific distance TA from the object-side surface of the third lens element, which is determined during the design phase to simultaneously achieve wide view angle and compact length. This predetermined positioning allows the lens to achieve half field of view angle≥60° while maintaining shortened overall length, resolving the contradiction between view angle and 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 approach effectively shortens the length of the optical imaging lens, enhances imaging quality, and increases the half field of view angle, while ensuring good optical characteristics and assembly yield.
Implementation Method 1
Each of the first, second, third, fourth, fifth and sixth lens elements has refracting power
Data Source
AI summary
Present embodiments provide for optical imaging lenses. An optical imaging lens may comprise six 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.