Seven-Lens Optical Imaging Layout for Thin High-Resolution Modules
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Solution Overview
Problem
There is a demand for optical imaging systems in portable terminals that offer high resolution while being compact in size, as portable terminals are becoming thinner and require reduced camera thickness.
Innovation Solution
An optical imaging system comprising a specific arrangement of lenses, including a first lens with a plane object-side surface, a second lens with positive refractive power, and other lenses with defined refractive powers and shapes, satisfying conditions such as 0.4<TTL/(2×IMG HT)<0.65 and n2+n3>3.15, to achieve high resolution and reduced thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lenses is increased to improve resolution, then image quality is improved, but device thickness increases
Solution Approach 1:
The patent implements a nested lens structure where lenses are arranged in concentric or closely spaced configurations along the optical axis. Multiple lenses (first lens through seventh lens) are nested within a compact housing, with each lens positioned to minimize overall thickness while maintaining the necessary optical elements for high resolution imaging.
Solution Approach 2:
The patent transitions from a conventional linear arrangement of lenses to a multi-dimensional configuration where lenses are positioned at different radial distances and axial positions. This allows the optical system to achieve high resolution through complex light path management while reducing the overall thickness by utilizing three-dimensional space more efficiently.
2Measurement precision
If lens curvature is increased to improve focusing, then image quality is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies different curvature characteristics to different regions of the lens system. The first lens has a specific curvature for initial light convergence, while subsequent lenses have progressively different curvatures optimized for their specific positions in the optical path. This localized optimization allows each lens to contribute to focusing without requiring extreme precision across the entire system.
Solution Approach 2:
The patent systematically varies optical parameters including curvature radius, refractive index, and thickness across the multiple lenses. By changing these parameters progressively from the first lens to the seventh lens, the system achieves effective focusing while keeping individual lens manufacturing requirements manageable through standardized parameter variations.
3Reliability
If refractive index is increased to improve light control, then optical performance is improved, but chromatic aberration increases
Solution Approach 1:
The patent employs a composite optical system where lenses with different refractive indices are combined in a specific sequence. The first lens through seventh lens are made from materials with varying refractive properties, creating a composite optical path that manages chromatic aberration through the combined effect of multiple materials rather than relying on a single high-refractive-index material.
Solution Approach 2:
The patent introduces intermediate lenses between the first lens and the seventh lens that act as mediators to correct chromatic aberration. These intermediate lenses with specific refractive indices help balance the light control functions while compensating for the chromatic effects introduced by higher refractive index materials, thereby maintaining optical performance without excessive aberration.
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 reduced size by optimizing lens arrangements and refractive properties, minimizing aberrations and chromatic aberration, while maintaining design flexibility.
Implementation Method 1
The plurality of lenses include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens disposed in this order... The second lens has positive refractive power... n2+n3>3.15 may be satisfied, where n2 is a refractive index of the second lens, and n3 is an Abbe number of the third lens
Data Source
AI summary
An optical imaging system includes a plurality of lenses sequentially disposed from an object side. The plurality of lenses include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens disposed in this order. The second lens has positive refractive power. 0.9<|(R1+R2)/(R1−R2)|<1.1, and 0.4<TTL/(2×IMG HT)<0.65 are satisfied, where R1 is a radius of curvature of an object-side surface of the first lens, R2 is a radius of curvature of an image-side surface of the first lens, TTL is a distance on an optical axis from the object-side surface of the first lens to an imaging plane, and IMG HT is a half of a diagonal length of the imaging plane.