Seven-Lens Optical Imaging Assembly for Compact Long-Focus Design
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Solution Overview
Problem
Existing long-focus lens assemblies for portable electronic devices face challenges in achieving both miniaturization and high imaging quality, as increasing the number of lenses to improve quality results in larger sizes that do not meet the requirements for long-focus, miniaturization, and high imaging quality simultaneously.
Innovation Solution
An optical imaging lens assembly comprising seven lenses, with specific refractive powers and surface shapes, is designed to optimize focal length, field of view, and lens thickness distribution, ensuring a compact size while maintaining high imaging quality and long-focus capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lenses is increased to achieve high imaging quality, then imaging quality is improved, but the size of the lens assembly increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the focal length ratio (f/f1≥2.0), field of view (HFOV≤35°), and thickness-to-spacing ratio (ΣCT/ΣAT≥0.5) of the lens assembly. These parameter optimizations enable high imaging quality with a compact seven-lens configuration, resolving the contradiction between quality and size
Solution Approach 2:
The lens assembly is segmented into seven specifically designed lenses with alternating positive and negative refractive powers. This segmentation allows for optimized optical path control and aberration correction, achieving high imaging quality while maintaining a compact form factor through efficient use of each lens element
2Length of stationary object
If the number of lenses is increased to achieve long-focus characteristics, then focal length is improved, but the size of the lens assembly increases
Solution Approach 1:
The patent achieves long-focus characteristics (f/f1≥2.0) while maintaining compact size by optimizing the focal length ratio parameter. The seven-lens configuration with specific focal length distributions enables extended focal length without proportionally increasing the physical dimensions of the lens assembly
Solution Approach 2:
The patent utilizes the spatial arrangement and spacing between lenses along the optical axis to achieve long focal length characteristics. By optimizing the axial distribution and spacing of the seven lenses, the system extends the effective focal length without increasing the radial or overall volume dimensions proportionally
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 lens assembly achieves miniaturization, long-focus characteristics, and high imaging quality by properly distributing refractive power, surface shape, and center thickness, enabling effective image capture of distant objects with a small depth of field and large zoom ratio.
Implementation Method 1
The first lens has a positive refractive power, and an object-side surface thereof may be a convex surface
Implementation Method 2
The second lens has a negative refractive power, and an image-side surface thereof may be a concave surface
Implementation Method 3
The seventh lens has a negative refractive power, and an object-side surface thereof may be a concave surface
Data Source
AI summary
The present disclosure discloses an optical imaging lens assembly. The optical imaging lens assembly includes, sequentially from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The first lens has a positive refractive power, and an object-side surface thereof is a convex surface; the second lens has a negative refractive power, and an image-side surface thereof is a concave surface; each of the third lens, the fourth lens, the fifth lens and the sixth lens have a positive refractive power or a negative refractive power; the seventh lens has a negative refractive power, and an object-side surface thereof is a concave surface. A total effective focal length f of the optical imaging lens assembly and an effective focal length f1 of the first lens satisfy f/f1≥2.0.