Five Element Imaging Lens Compact System Length Aberration Control
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Solution Overview
Problem
Conventional imaging lenses with five lens elements are too long for miniaturized electronic devices, making it difficult to achieve a satisfactory tradeoff between system length and aberration without compromising imaging quality.
Innovation Solution
An imaging lens with five lens elements, where each element has specific refractive powers and surface configurations, including convex and concave portions, and air gaps that satisfy specific equations to reduce overall length while maintaining good optical performance, comprising a first, second, third, fourth, and fifth lens element with positive and negative refractive powers, and an optical filter to reduce infrared light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional imaging lenses with five lens elements are used, then imaging quality is maintained, but system length becomes too long for miniaturized electronic devices
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive powers, curvatures, and thicknesses of the five lens elements to achieve a system length below 4mm while maintaining imaging quality. Specific parameters such as the refractive power of each lens element (positive or negative), the curvature radii of object-side and image-side surfaces, and the thicknesses are precisely controlled within defined ranges to resolve the contradiction between miniaturization and optical performance
Solution Approach 2:
The patent uses composite material principles by combining lens elements with different refractive powers and material properties (positive and negative refractive power elements) to achieve both compact size and high imaging quality. The combination of different lens materials and surface configurations (convex and concave portions) creates a composite optical system that overcomes the limitations of individual lens designs
2Length of moving object
If system length is reduced below 4mm, then miniaturization is achieved, but aberration control becomes difficult
Solution Approach 1:
The patent applies local quality by introducing convex and concave portions at specific locations on the lens surfaces (object-side and image-side surfaces of different lens elements). These localized surface features are strategically positioned to correct spherical aberration, chromatic aberration, and distortion without requiring increased system length. The convex portion and concave portion create localized optical path modifications that compensate for aberrations in the compact configuration
Solution Approach 2:
The patent employs dynamic design principles by optimizing the air gaps between lens elements and the thicknesses of individual elements to dynamically adjust the optical path. The air gap distances and element thicknesses are precisely controlled to maintain aberration correction across different focal positions and field angles, enabling the compact lens to achieve high imaging quality despite the reduced system 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
The imaging lens achieves a reduced system length of below 4 mm while maintaining low spherical, chromatic, and distortion aberrations, suitable for use in miniaturized electronic devices without compromising optical performance.
Implementation Method 1
first, second, third, fourth and fifth lens elements. Each of the first, second, third, fourth and fifth lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side
Implementation Method 2
an optical filter to reduce infrared light transmission
Data Source
AI summary
An optical imaging lens includes five lens elements arranged from an object side to an image side in a given order along an optical axis of the optical imaging lens. The object-side surface of the second lens element has a convex portion in a vicinity of its periphery, the object-side surface of the third lens element has a convex portion in a vicinity of the optical axis, the object-side surface of the fourth lens element has a concave portion in a vicinity of its periphery, the optical imaging lens as a whole has only the five lens elements, and an effective system focal length is EFL, an air gap between the second lens element and the third lens element along the optical axis is G23, a central thickness of the third lens element along the optical axis is T3, and EFL, G23 and T3 satisfy the equation4.89≤EFL/(G23+T3)≤5.88.