Optical Imaging Lens Shortening Length via Five-Element Segmentation
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Solution Overview
Problem
Current optical imaging lenses face challenges in achieving a compact design with good imaging quality while maintaining thermal stability, as they tend to have longer lens lengths and are affected by temperature changes, which impact their focal shift.
Innovation Solution
The design incorporates a specific arrangement of five lens elements with varying refractive powers and surface curvatures, including convex and concave portions, made of different materials, satisfying certain conditional expressions to reduce lens length and enhance thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the lens length is shortened to achieve miniaturization, then the compactness is improved, but the imaging quality deteriorates
Solution Approach 1:
The optical imaging lens is divided into five lens elements with different refractive powers and surface curvatures. Each lens element is designed with specific convex and concave portions to distribute optical functions, enabling compact overall length while maintaining imaging quality through coordinated action of segmented components.
Solution Approach 2:
Different lens elements are made with varying local surface characteristics - some with convex portions near the optical axis, others with concave portions in specific regions. The fourth lens element uses glass material with positive refractive power in specific zones to optimize local light control, enabling compact design without sacrificing imaging precision.
2Length of moving object
If the lens elements are arranged to reduce lens length, then the compactness is improved, but the thermal stability deteriorates
Solution Approach 1:
The patent employs conditional expressions that define specific parameter ranges for lens element arrangements, thicknesses, and air gaps. By controlling parameters such as the ratio of total lens thickness to air gap distances within specified ranges, the design achieves thermal stability while maintaining compact dimensions.
Solution Approach 2:
The optical system combines different materials - primarily plastic lens elements with the fourth lens element made of glass with positive refractive power. This composite material approach balances thermal expansion characteristics across the lens assembly, improving thermal stability in a compact configuration.
3Manufacturing precision
If the lens elements are designed with complex surface curvatures to improve imaging quality, then the imaging quality is improved, but the device complexity increases
Solution Approach 1:
The complex optical function is segmented across five lens elements, each with relatively simple convex or concave surface portions. Instead of one complex lens, the functionality is distributed across multiple simpler elements, achieving high imaging quality while keeping individual element manufacturing feasible.
Solution Approach 2:
Each lens element features well-defined spherical or aspherical curvatures - convex portions near the optical axis and concave portions in other regions. These standardized curved surfaces achieve the needed optical correction without requiring overly complex non-standard geometries, balancing imaging quality with manufacturability.
4Length of moving object
If the lens elements are arranged to minimize lens length, then the compactness is improved, but the air gap distances are reduced, affecting thermal stability
Solution Approach 1:
The patent establishes specific parameter relationships through conditional expressions, controlling the ratio of total lens thickness to air gap distances. By maintaining air gaps within defined proportional ranges rather than minimizing them absolutely, the design achieves compact length while preserving thermal stability through adequate spacing between elements.
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 high imaging quality and minimizing thermal-induced focal shifts, ensuring stability across temperature variations.
Implementation Method 1
The first lens element has negative refractive power. The object-side surface of the first lens element has a convex portion in a vicinity of the optical axis. The object-side surface of the second lens element has a convex portion in a vicinity of a periphery of the second lens element, and the image-side surface of the second lens element has a convex portion in the vicinity of the optical axis. The image-side surface of the third lens element has a concave portion in the vicinity of the optical axis. The fifth lens element has negative refractive power, and the image-side surface of the fifth lens element has a concave portion in a vicinity of the optical axis and a convex portion in a vicinity of a periphery of the fifth lens element.
Data Source
AI summary
The present invention provides an optical imaging lens including a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element arranged in a sequence from an object side to an image side. The present invention can shorten the lens length, enlarge field of view angle and have good thermal stability performance in a good optical performance condition via controlling the concave and convex shape design and arrangement of the object side surface or the image side surface of the abovementioned lens element, controlling the material of the abovementioned lens element in the optical imaging lens, and satisfying conditional expressions.