Six-Lens Telescopic Imaging for Compact Mobile Devices
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Solution Overview
Problem
Telescopic optical imaging systems are often too large to be mounted in small electronic devices due to a high total length to focal length ratio, making them unsuitable for mobile communications terminals.
Innovation Solution
A telescopic optical imaging system with six lenses arranged sequentially, featuring specific refractive powers and surface curvatures, including concave and convex surfaces, and adhering to refractive index and focal length conditions, allowing for miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a telescopic optical imaging system is designed with sufficient focal length to capture distant subjects, then the imaging capability is improved, but the total length of the system increases making it difficult to mount in small devices
Solution Approach 1:
The optical system is divided into six separate lens elements (first through sixth lenses) with specific refractive powers and surface curvatures. This segmentation allows the total optical power to be distributed across multiple elements, enabling a compact total length while maintaining the required focal length for distant subject imaging.
Solution Approach 2:
Each lens element is designed with specific local optical properties including positive or negative refractive power and specific surface curvature characteristics (convex or concave). For example, the first lens has positive refractive power with a concave image-side surface, while the sixth lens has negative refractive power with a concave image-side surface. This localized optimization of optical properties enables compact system design while achieving the required imaging performance.
2Length of moving object
If the optical system uses multiple lens elements with specific refractive powers to reduce total length, then the system size is reduced, but the complexity of lens arrangement and design increases
Solution Approach 1:
The system uses six discrete lens elements that can be independently designed and manufactured, then assembled in a specific sequence. This segmentation simplifies the overall design process by allowing each element to be optimized separately while maintaining a relatively simple linear arrangement along the optical axis, rather than requiring complex three-dimensional configurations.
Solution Approach 2:
The patent specifies particular parameter ranges for each lens element including refractive power signs (positive or negative), surface curvature types (convex or concave), and their sequential arrangement. By establishing these parameter constraints, the design space is narrowed to manageable configurations that achieve compactness without requiring exploration of excessively complex arrangements.
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 effectively captures images of distant subjects while being compact enough to fit within small devices, optimizing aberration correction and reducing size constraints.
Implementation Method 1
A telescopic optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens which are sequentially arranged on an optical axis from an object side to an image side
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.