Seven-Lens Optical Module for Compact Aberration Correction
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Solution Overview
Problem
The miniaturization and lightweight design of mobile communications terminals pose challenges for implementing camera modules with high resolution and performance, particularly due to issues with chromatic aberrations and optical systems in plastic lenses.
Innovation Solution
A lens module comprising seven lenses with specific refractive powers and surface configurations, including inflection and turning points, that satisfy certain conditional expressions for optimal performance and miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If lenses are formed of plastic to reduce weight, then the weight of the camera module is reduced, but chromatic aberrations worsen and optical performance deteriorates
Solution Approach 1:
The patent employs a composite lens structure where the first lens is made of plastic material and the second lens is made of glass material. This composite approach allows the system to benefit from the lightweight properties of plastic while using glass to correct chromatic aberrations and improve optical performance. The specific arrangement of plastic and glass lenses in sequence enables weight reduction without sacrificing optical quality.
2Measurement precision
If five or more lenses are used to achieve high resolution, then the resolution of the camera module is improved, but the size and complexity of the lens module increase
Solution Approach 1:
The patent optimizes specific parameters of the lens system including the focal lengths, refractive indices, and curvature radii of the lenses. By carefully controlling parameters such as the ratio of focal lengths between lenses and the specific curvature values, the system achieves high resolution with a compact five-lens configuration. The conditional expressions in the patent define optimal parameter ranges that balance resolution with compactness.
Solution Approach 2:
The patent employs aspheric surfaces on multiple lenses including the first, second, third, fourth, and fifth lenses. These aspheric configurations with specific curvature radii and higher-order aspheric coefficients enable high resolution imaging while maintaining a compact lens module size. The curved surfaces are optimized to correct various aberrations and improve image quality without requiring additional lenses.
3Object-affected harmful factors
If five or more lenses are configured to correct aberrations, then the image quality is improved, but the overall length of the lens module increases
Solution Approach 1:
The patent arranges the five lenses in a compact nested configuration where each lens is positioned closely to the next. The lens spacing is optimized to minimize the overall length while maintaining effective aberration correction. The compact arrangement allows the lenses to work together in sequence with minimal distance between elements, achieving high aberration correction performance in a short optical path.
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 lens module improves aberration correction and enhances image quality while maintaining a compact size, supporting high resolution and performance in camera modules.
Implementation Method 1
a first lens L1 having positive refractive power; a second lens L2 having refractive power; a third lens L3 having positive refractive power; a fourth lens L4 having refractive power; a fifth lens L5 having refractive power; a sixth lens L6 having refractive power; and a seventh lens L7 having negative refractive power
Data Source
AI summary
A lens module may include a first lens having positive refractive power, a second lens having refractive power, a third lens having positive refractive power, a fourth lens having refractive power, a fifth lens having refractive power, a sixth lens having refractive power, and a seventh lens having negative refractive power. An inflection point may be formed on an image-side surface of the sixth lens. A turning point may be formed on an image-side surface of the seventh lens. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are disposed in a sequential order from the first lens to the seventh lens.