Eight-Lens Optical Layout for Compact High-Resolution Imaging
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Solution Overview
Problem
There is a demand for high-resolution optical imaging systems in portable terminals that are compact in size, yet existing systems struggle to achieve both high resolution and reduced size effectively.
Innovation Solution
An optical imaging system comprising eight lenses, each with specific refractive powers and configurations, including aspherical surfaces, that satisfy certain conditional expressions to optimize image quality and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lenses is increased to achieve high resolution, then image quality is improved, but the total length of the optical system increases
Solution Approach 1:
The patent applies nesting by placing multiple lens groups (first through eighth lenses) in a compact stacked arrangement where each lens group is positioned close to the others, minimizing the overall optical path length while maintaining high resolution imaging capability through the combined refractive powers of all lenses
Solution Approach 2:
The patent transitions from traditional linear lens arrangements to a multi-dimensional compact configuration by optimizing the spatial positioning and spacing of eight lenses in three-dimensional space, allowing high resolution to be achieved without proportionally increasing the total length along the optical axis
2Length of moving object
If the total focal length is reduced to decrease system size, then compactness is improved, but field of view is reduced
Solution Approach 1:
The patent applies local quality by assigning different refractive power characteristics to different lens groups: the first lens has positive refractive power, the second lens has negative refractive power, and this pattern continues through the eighth lens. This localized optimization of optical properties allows compact focal length while maintaining wide field of view capability
Solution Approach 2:
The patent achieves the balance between compactness and field of view by carefully controlling and optimizing multiple parameters including the focal lengths of individual lenses (f1, f2, f3, f4, f5, f6, f7, f8), their spacing (d1, d2, d3, d4, d5, d6, d7), and the ratios TTL/f and FOV×(IMG HT/f), allowing the system to maintain small size while preserving wide angular coverage
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 high resolution while maintaining a reduced total length, enhancing image quality and field of view, and correcting various aberrations.
Implementation Method 1
an optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens disposed in order from an object side to an imaging side, wherein: the first lens is configured to have positive refractive power, and the second lens is configured to have negative refractive power
Data Source
AI summary
An optical imaging system is provided. The optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens disposed in order from an object side to an imaging side. The first lens has positive refractive power, while the second lens has negative refractive power, and TTL/(2×IMG HT)<0.6, −0.2<SAG52/TTL<0, and 10<v1−(v6+v7)/2<30 are satisfied, where TTL is a distance from an object-side surface of the first lens to an imaging plane on an optical axis, IMG HT is equal to half a diagonal length of the imaging plane, SAG52 is a SAG value at an end of an effective aperture of an image-side surface of the fifth lens, v1 is an Abbe number of the first lens, v6 is an Abbe number of the sixth lens, and v7 is an Abbe number of the seventh lens.