Positive-Negative Lens Layout for Compact Telescopic Imaging
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Solution Overview
Problem
Telescopic optical imaging systems are typically large and difficult to integrate into small electronic devices due to their high total length to focal length ratio, making them unsuitable for portable terminals.
Innovation Solution
A telescopic optical imaging system comprising six lenses with specific refractive powers and surface configurations, including positive and negative refractive powers, concave and convex surfaces, and satisfying certain conditional expressions to minimize size while maintaining imaging performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a telescopic optical imaging system is designed with conventional lens configurations, then long-distance imaging capability is achieved, but the total length of the optical system becomes too large to be mounted in small portable terminals
Solution Approach 1:
The patent applies parameter changes by carefully selecting and adjusting the refractive powers, focal lengths, and surface curvatures of each lens element. Specifically, the first lens has positive refractive power with specific focal length relationships, the second and third lenses have negative refractive powers with controlled ratios, and the sixth lens has positive refractive power with a convex image-side surface. These parameter optimizations enable the system to achieve telescopic imaging functionality while reducing the total length-to-focal length ratio below 1.0, making it suitable for portable devices
Solution Approach 2:
The patent achieves multi-functionality by designing a compact six-lens optical system that simultaneously provides wide-angle imaging, telephoto imaging, and autofocus capabilities. The movable lens assembly between the third and fourth lenses enables focus adjustment, while the specific arrangement of positive and negative power lenses provides both wide-angle and telephoto functions, eliminating the need for separate optical systems for different imaging modes
2Length of moving object
If the optical system is miniaturized to fit in portable terminals, then the total length is reduced, but the imaging performance and resolution may deteriorate
Solution Approach 1:
The patent maintains high imaging performance through precise parameter control of each lens element. The first lens has positive refractive power with focal length relationships satisfying specific conditions, the second and third lenses have negative refractive powers with controlled ratios, and the sixth lens has positive refractive power with a convex image-side surface. These parameter optimizations enable the system to achieve telescopic imaging functionality while reducing the total length-to-focal length ratio below 1.0, making it suitable for portable devices
Solution Approach 2:
The patent replaces complex mechanical zoom mechanisms with an optimized optical design that achieves telescopic functionality through the arrangement and power distribution of six lens elements. The movable lens assembly provides focus adjustment without requiring large mechanical travel, and the specific power distribution among lenses achieves variable magnification effects through optical rather than mechanical means
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 long-distance imaging capabilities while being compact enough to be mounted in small-sized terminals, addressing the challenge of miniaturization and maintaining high resolution.
Implementation Method 1
a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a negative refractive power
Data Source
AI summary
An optical imaging system includes a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a negative refractive power, a fourth lens, a fifth lens, and a sixth lens having a positive refractive power and having a convex image-side shape, sequentially arranged in a direction from an object side of the optical imaging system to an imaging plane of the optical imaging system.