Seven-Lens Optical Imaging With Movable Group for Wide-Angle Miniaturization
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Solution Overview
Problem
Optical imaging systems for small devices, such as unmanned aerial vehicles and small terminals, face a trade-off between weight and resolution, with glass systems being too heavy and plastic systems offering lower resolution.
Innovation Solution
A seven-lens optical imaging system with specific refractive powers and configurations, including a movable second lens group, that satisfies certain conditional expressions to achieve high resolution and miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an optical imaging system is formed of glass to achieve high resolution, then the resolution level is improved, but the weight increases significantly
Solution Approach 1:
The patent applies parameter changes by carefully controlling the refractive indices, focal lengths, and curvature radii of the seven lenses to achieve high resolution with plastic materials. The conditional expressions (1) through (7) define specific parameter ranges that optimize optical performance while maintaining lightweight construction.
Solution Approach 2:
The optical imaging system uses plastic materials for lens construction, representing a composite material approach that combines lightweight properties with optical performance. The system integrates multiple plastic lenses with different refractive powers and surface curvatures to achieve glass-level resolution without the weight penalty.
2Weight of moving object
If an optical imaging system is formed of plastic to reduce weight, then the weight is reduced, but the resolution level decreases
Solution Approach 1:
The patent divides the optical system into seven distinct lens groups with specific refractive powers and surface configurations. This segmentation allows each lens to be optimized for its specific function, collectively achieving high resolution performance that overcomes the typical limitations of plastic optical systems.
Solution Approach 2:
The patent employs precise parameter control through conditional expressions that define relationships between focal lengths, curvature radii, and refractive indices. These parameter optimizations enable plastic lenses to achieve resolution levels previously only attainable with glass materials.
3Adaptability or versatility
If the field of view is widened to monitor a wide region, then the coverage area is improved, but the system size increases
Solution Approach 1:
The patent incorporates a movable second lens group that can shift along the optical axis, enabling dynamic adjustment of focusing and field of view. This dynamic capability allows the system to maintain a compact form factor while achieving wide field of view and high resolution through active optical control rather than passive size increase.
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 system achieves high resolution and compact size, suitable for small devices with a wide field of view, overcoming the limitations of glass and plastic systems.
Implementation Method 1
The first to seventh lenses are sequentially disposed from an object side toward an imaging plane... The first lens may have a negative refractive power. The second lens may have a positive refractive power.
Data Source
AI summary
An optical imaging system includes a first lens group and a second lens group. The first lens group includes a first lens and a second lens. The second lens group includes a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The first to seventh lenses are sequentially disposed from an object side toward an imaging plane. The optical imaging system satisfies TTL/2Y<1.3, where TTL is a distance from an object-side surface of the first lens to the imaging plane, and 2Y is a diagonal length of the imaging plane.