Eight-Lens Optical Imaging Layout for Slim High-Resolution Cameras
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Solution Overview
Problem
There is a need for a slim optical imaging system capable of achieving high resolution in portable terminals, as they are becoming smaller and require improved camera functionality.
Innovation Solution
An optical imaging system comprising eight lenses with specific refractive powers and configurations, including positive and negative refractive powers, narrow lens spacings, and aspherical surfaces, to achieve high resolution and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lenses is increased to achieve high resolution, then imaging quality is improved, but the overall length of the optical system increases
Solution Approach 1:
The patent applies parameter changes by carefully selecting and optimizing the refractive powers, refractive indices, and axial distances of each lens. Specifically, the conditional expressions define precise ranges for parameters such as D12/D_MAX (0.05-0.40), D23/D_MAX (0.05-0.40), and individual lens refractive powers, which enable the system to achieve high resolution with a compact total length by transforming the optical parameters of the lens assembly.
2Length of moving object
If the refractive power of individual lenses is increased to reduce system length, then compactness is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent balances compactness and manufacturability by defining specific ranges for refractive powers and axial distances. The conditional expressions ensure that no single lens requires excessive refractive power by distributing the optical burden across multiple lenses with controlled parameters. For example, the constraints on D12 and D23 relative to D_MAX, along with refractive power ratios, prevent any single lens from becoming too strong, thereby maintaining reasonable manufacturing precision requirements while achieving overall system compactness.
3Length of moving object
If the axial distance between lenses is reduced to achieve slim profile, then device thickness is improved, but optical performance may deteriorate
Solution Approach 1:
The patent resolves the contradiction between slim profile and optical performance by establishing precise conditional expressions for axial distances. The parameters D12/D_MAX (0.05-0.40) and D23/D_MAX (0.05-0.40) define optimal spacing that is sufficiently small to achieve a slim device but large enough to maintain proper optical performance. Additionally, the refractive power constraints ensure that lenses are positioned and powered appropriately to compensate for reduced spacing, maintaining imaging quality while achieving compactness.
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 and compactness, meeting the requirements for slim portable devices while maintaining optical performance.
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 sequentially from an object side. The first lens and the second lens each have a positive refractive power, and the third lens has a negative refractive power
Data Source
AI summary
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 sequentially from an object side The first lens and the second lens each have a positive refractive power, and the third lens has a negative refractive power, and D12/D_MAX<0.15 is satisfied, where D12 is a distance on an optical axis between an image-side surface of the first lens and an object-side surface of the second lens, and D_MAX is a greatest distance among distances between neighboring lenses.