Five-Element Optical Imaging Lens Compact Length Design
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Solution Overview
Problem
Existing optical imaging lenses with five lens elements fail to achieve a balance between shortening length and maintaining good optical characteristics, particularly in terms of field of view and thickness, as they often result in suboptimal imaging quality and longer lengths.
Innovation Solution
The optical imaging lens is designed with specific refracting power and surface shapes for its elements, including a convex or concave structure, and parameters such as thickness and air gaps are controlled to satisfy certain inequalities, ensuring a shorter length while maintaining good optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the length of the optical imaging lens is reduced, then the device becomes thinner and more compact, but the optical characteristics such as field of view and imaging quality deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the thickness of the second lens element (T2) and its relationship with other parameters (T3, AG12, AG23) through specific inequalities. This allows optimization of the optical path and light refraction to maintain imaging quality while reducing overall lens length. The controlled parameters include T2/AG23≤2.5, T2/T3≤1.2, and T2/AG12≤5.3, which ensure proper light convergence and field of view despite the compact design.
2Length of moving object
If the thickness of lens elements is reduced to shorten the optical imaging lens, then the overall length decreases, but the optical performance and imaging quality worsen
Solution Approach 1:
The patent applies local quality by giving different thickness requirements to different lens elements. Specifically, the second lens element's thickness (T2) is controlled within specific ranges relative to other parameters, while other elements have different optimization criteria. This localized control of thickness allows the system to achieve compact overall dimensions while maintaining adequate optical performance through differentiated design of individual components.
3Adaptability or versatility
If the field of view is increased to provide wider imaging coverage, then the imaging quality improves, but the length of the optical imaging lens increases
Solution Approach 1:
The patent applies dimensionality change by optimizing the lateral dimensions (diameter) of lens elements, particularly the second lens element, to control the field of view. By adjusting the diameter ratio T2/D2 and controlling the air gaps between elements, the patent achieves a half field of view (HFOV) of 32-33 degrees through lateral dimensional optimization rather than increasing the optical path length, thus maintaining a compact lens length while providing adequate imaging coverage.
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 a shorter optical imaging lens length while maintaining high optical quality and a wider field of view, effectively addressing the limitations of previous designs.
Implementation Method 1
each of the first, second, third, fourth and fifth lens elements having refracting power
Data Source
AI summary
Present embodiments provide for a mobile device and an optical imaging lens thereof. The optical imaging lens comprises five lens elements positioned sequentially from an object side to an image side. Through controlling the convex or concave shape of the surfaces, the refracting power of the lens elements and two parameters to meet an inequality associated with the thickness of the second lens element, the optical imaging lens shows better optical characteristics and the total length of the optical imaging lens is shortened.