Six-Lens Telescopic Imaging for Compact Mobile Terminals
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Solution Overview
Problem
Telescopic optical imaging systems are too large to be mounted in small electronic devices due to a significant size ratio (TL/f) of total length to overall focal length, making them unsuitable for mobile communications terminals.
Innovation Solution
A telescopic optical imaging system comprising six lenses with specific refractive powers and surface configurations, including concave and convex surfaces, arranged to minimize size while maintaining imaging capabilities, with refractive index relationships (0.7<TL/f<1.0 and |Nd2-Nd3|<0.2) to fit within small terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a telescopic optical imaging system is designed to capture images of distant subjects, then the imaging capability for long-distance subjects is improved, but the total length of the system becomes large making it difficult to mount in small electronic devices
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive indices of the lenses (specifically setting 0.7<Nd1<1.8, 1.5<Nd2<2.0, Nd3<1.5) and their relative positions to achieve a compact total length while maintaining the telescopic imaging function for distant subjects
Solution Approach 2:
The patent uses composite lens design with multiple lenses having different refractive index ranges and material properties (Nd1, Nd2, Nd3) to achieve both compact size and effective distant subject imaging capability
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 compact size suitable for small devices while maintaining effective imaging capabilities for distant subjects, allowing integration into mobile communications terminals.
Implementation Method 1
A telescopic optical imaging system comprising six lenses with specific refractive powers and surface configurations, including concave and convex surfaces, arranged to minimize size while maintaining imaging capabilities
Data Source
AI summary
An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens sequentially arranged on an optical axis from an object side to an image side, wherein an image-side surface of the first lens and an image-side surface of the sixth lens may be concave, and 0.7<TL/f<1.0 and |Nd2-Nd3|<0.2 in which TL may be a distance from an object-side surface of the first lens to an imaging plane, f may be an overall focal length of the optical imaging system, Nd2 may be a refractive index of the second lens, and Nd3 may be a refractive index of the third lens.