Seven-Lens Optical Imaging Layout for Compact Camera Modules
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Solution Overview
Problem
Small camera modules in wireless terminals face challenges in achieving high performance due to size constraints, making it difficult to implement lenses with desirable optical characteristics.
Innovation Solution
An optical imaging system comprising seven lenses, including specific refractive indices and configurations, such as convex surfaces and aspherical shapes, to enhance performance within limited space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the size of the camera module is reduced to fit wireless terminals, then the device can be mounted in more applications, but the optical performance deteriorates due to limited space for lenses
Solution Approach 1:
The optical system is divided into seven separate lens elements (first lens through seventh lens) with specific refractive powers and configurations. Each lens is positioned at a determined distance from the imaging plane, allowing the system to achieve high optical performance within a compact total volume by distributing the optical function across multiple segmented components rather than a single large lens.
Solution Approach 2:
The patent employs lenses with specific refractive indices (1.6 or more for certain lenses) and controlled curvatures to optimize the optical path. By carefully selecting and adjusting parameters such as refractive power, refractive index, and surface curvature, the system achieves a bright optical system with wide field of view (70° or more) and f-number less than 1.7 despite the compact size.
2Reliability
If more lenses are added to improve optical performance, then the optical characteristics improve, but the device complexity increases
Solution Approach 1:
The optical system is divided into seven separate lens elements (first lens through seventh lens) with specific refractive powers and configurations. Each lens is positioned at a determined distance from the imaging plane, allowing the system to achieve high optical performance within a compact total volume by distributing the optical function across multiple segmented components rather than a single large lens.
Solution Approach 2:
The patent employs lenses with specific refractive indices (1.6 or more for certain lenses) and controlled curvatures to optimize the optical path. By carefully selecting and adjusting parameters such as refractive power, refractive index, and surface curvature, the system achieves a bright optical system with wide field of view (70° or more) and f-number less than 1.7 despite the compact size.
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 a bright optical system with a wide field of view and improved performance, including an f-number less than 1.7 and a field of view of 70° or more, enhancing the capabilities of small camera modules.
Implementation Method 1
a second lens having a refractive power and a refractive index of 1.65 or more
Data Source
AI summary
An optical imaging system includes a first lens having an object-side surface that is convex; a second lens having a refractive power and a refractive index of 1.65 or more; a third lens having a refractive power; a fourth lens having a refractive power and an object-side surface that is convex; a fifth lens having a refractive power; a sixth lens having a positive refractive power; and a seventh lens having an object-side surface that is convex, wherein the first lens through the seventh lens are sequentially disposed in numerical order from an object side of the optical imaging system toward an imaging plane of the optical imaging system, and two or more of the first lens and the third lens through the seventh lens have a refractive index of 1.6 or more.