Four-Element Optical Imaging Lens Compact Design
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Solution Overview
Problem
The challenge lies in designing a small-sized optical lens with perfect imaging quality and enhanced field angle of view, which is difficult due to the limitations in reducing the lens's length while maintaining desirable optical characteristics, particularly for applications in mobile devices and other compact systems.
Innovation Solution
The optical imaging lens is designed with a configuration of four lens elements, where the convex or concave shape of surfaces is controlled to shorten the lens length, with specific refracting powers and air gaps between elements, ensuring desirable optical characteristics and aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the length of the optical lens is reduced to make it smaller, then the size of the optical lens is reduced, but the imaging quality deteriorates
Solution Approach 1:
The optical lens is divided into four separate lens elements with different refracting powers and surface shapes. Each lens element contributes to correcting specific optical aberrations, allowing the system to maintain high imaging quality in a compact form. The segmentation enables distributed correction of aberrations that would be difficult to achieve in a single shorter lens.
Solution Approach 2:
Different lens elements have different local optical properties - the first lens element has negative refracting power with specific convex/concave surface configurations, while the second has positive refracting power. Each element is optimized for its specific function in the optical path, with carefully controlled surface shapes (convex portions, concave portions) at different locations to correct specific aberrations locally.
2Volume of moving object
If the length of the optical lens is reduced, then the size is reduced, but the field angle of view enhancement is limited
Solution Approach 1:
The optical lens system is designed with flexible air gaps between lens elements that can be adjusted during assembly and operation. The air gaps (G12, G23, G34) are carefully controlled to satisfy specific ratio relationships, enabling the system to achieve both compact size and enhanced field angle of view. This dynamic adjustment capability allows optimization of the optical path for wide-angle performance.
Solution Approach 2:
The patent introduces specific geometric relationships between air gaps and lens thicknesses (ALT/AAG ≤ 1.25) as a dimensional constraint that enables compact design. By controlling the ratio of total lens thickness to total air gap distance, the system achieves compact form factor while maintaining the optical path length necessary for enhanced field angle of view through careful spatial arrangement.
3Manufacturing precision
If the lens elements are arranged with specific air gaps to maintain optical characteristics, then the imaging quality is improved, but the complexity of assembly increases
Solution Approach 1:
The patent establishes specific parameter relationships that must be satisfied during assembly: the ratio ALT/AAG ≤ 1.25, and individual air gap ratios (G12/T2, G23/T3, G34/T4) within specific ranges. These parameter constraints provide clear assembly guidelines that simplify the manufacturing process by transforming complex optical optimization into straightforward dimensional control during assembly.
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 shortens the lens length while maintaining good optical performance, enhancing image quality and field of view, and simplifying the manufacturing process, addressing the challenges of compactness and imaging quality demands.
Implementation Method 1
Each of the first, second, third, and fourth lens elements may have a refracting power
Data Source
AI summary
Present embodiments provide for an optical imaging lens. The optical imaging lens may comprise four lens elements positioned sequentially from an object side to an image side. Through 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.