Five-Lens Optical Imaging System for Compact Long-Distance Telescopic Imaging
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Solution Overview
Problem
Existing telescopic optical systems for long-distance imaging are large in size, making it difficult to mount them in small electronic devices such as mobile terminals.
Innovation Solution
An optical imaging system comprising five lenses with specific refractive powers and surface curvatures, including a first lens with positive refractive power and a convex object-side surface, a second lens with negative refractive power and a convex object-side surface, a third lens with negative refractive power and a concave image-side surface, a fourth lens with negative refractive power and inflection points on its image-side surface, and a fifth lens with positive refractive power and a convex image-side surface, designed to satisfy specific ratios and ranges for overall length, focal length, and refractive index.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a telescopic optical system is designed for long-distance imaging, then the imaging capability is improved, but the size of the system increases
Solution Approach 1:
The optical system is divided into multiple lens elements (first lens through fifth lens) with different refractive powers and surface curvatures. Each lens segment contributes specific optical functions, allowing the system to achieve telescopic imaging capability while keeping each individual lens compact and manageable in size.
Solution Approach 2:
The patent employs specific refractive index ranges (1.5-1.7 for first and fifth lenses, 1.6-1.8 for second and fourth lenses) and controlled surface curvatures (convex object-side surfaces with specific radii) to optimize the optical path length and focal length relationship, achieving a balanced TL/f ratio that enables long-distance imaging within compact dimensions.
2Measurement precision
If the overall length to focal length ratio (TL/f) is increased to achieve telescopic properties, then the long-distance imaging capability is improved, but the system becomes larger
Solution Approach 1:
The patent utilizes curved surfaces (spherical, aspherical, or aplanatic) instead of flat surfaces to manipulate light paths in three-dimensional space. The convex object-side surfaces and concave image-side surfaces create complex light routing that achieves telescopic focal length extension without proportionally increasing the linear dimensions of the system.
Solution Approach 2:
The optical system combines multiple lens materials with different refractive indices and dispersion characteristics. The first and fifth lenses use materials with refractive indices of 1.5-1.7, while the second and fourth lenses use materials with refractive indices of 1.6-1.8, creating a composite optical system that optimizes both telescopic performance and compactness through material diversity.
3Measurement precision
If multiple lenses with specific refractive powers are used to achieve telescopic imaging, then the imaging performance is improved, but the device complexity increases
Solution Approach 1:
Each lens element is designed to perform multiple functions simultaneously. For example, the first lens with positive refractive power and convex object-side surface provides both light gathering and specific aberration correction. The fifth lens with positive refractive power and convex image-side surface similarly combines multiple functions, reducing the need for separate dedicated components and optimizing the overall system complexity.
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 optical imaging system enables long-distance imaging while being compact enough to be mounted in small terminals, achieving a balance between telescopic properties and size constraints.
Implementation Method 1
a first lens may include positive refractive power and a convex image-side surface; a second lens may include negative refractive power
Data Source
AI summary
An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The first lens has positive refractive power and a convex image-side surface. The second lens has negative refractive power. The third lens has negative refractive power. The fourth lens has negative refractive power and an inflection point formed on an image-side surface thereof. The fifth lens has positive refractive power and a convex image-side surface.