Six-Lens Optical Imaging System Balancing Miniaturization and Resolution
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Solution Overview
Problem
The demand for a portable optical imaging system with miniaturization and high resolution is increasing, particularly for mobile phone camera modules, while existing systems struggle to balance miniaturization with large image plane and high imaging quality.
Innovation Solution
An optical imaging system comprising six lenses with specific refractive powers and surface curvatures, including positive and negative refractive power lenses, is designed to achieve miniaturization, high resolution, and improved imaging performance by rationally distributing refractive power and lens spacing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lenses is increased to improve imaging quality and resolution, then the imaging performance is improved, but the system size and complexity increase
Solution Approach 1:
The optical imaging system divides the imaging function into six distinct lenses with different refractive powers and surface curvatures. Each lens is specifically designed with particular optical properties (positive or negative refractive power, convex or concave surfaces) to address specific aberrations and imaging requirements, thereby achieving high resolution while maintaining manageable system complexity through functional segmentation.
2Area of stationary object
If the focal length is increased to improve image plane size, then the image plane area is enlarged, but the system length increases
Solution Approach 1:
The patent employs precise control of optical parameters including refractive power, surface curvature radii, and lens spacing to achieve an optimized balance between image plane area and system length. By carefully selecting parameters such as the effective focal length (satisfying f*tan(Semi-FOV)≥4.4mm) and controlling the distance from the first lens to the imaging plane (TTL), the system achieves a large image plane without excessive system length.
3Reliability
If the refractive power distribution is optimized to reduce aberrations, then the imaging quality is improved, but the lens design complexity increases
Solution Approach 1:
Each lens in the six-lens system is designed with specific local optical properties: the first lens has positive refractive power with convex-concave surfaces, the second lens has negative refractive power, the third lens has positive refractive power with concave-convex surfaces, and so on. This local differentiation of optical properties allows each lens to address specific aberrations (spherical aberration, coma, astigmatism, field curvature, distortion) while maintaining overall system manageability.
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 effectively balances miniaturization with high resolution and large image plane capabilities, reducing sensitivity and aberrations, and is suitable for portable electronic products.
Implementation Method 1
a first lens having positive refractive power; a second lens having negative refractive power; a third lens having refractive power... a sixth lens having negative refractive power
Data Source
AI summary
The present disclosure discloses an optical imaging system which includes, sequentially from an object side to an image side along an optical axis, a first lens having positive refractive power; a second lens having negative refractive power; a third lens having refractive power with an object-side surface being concave and an image-side surface being convex; a fourth lens having refractive power; a fifth lens having positive refractive power with an object-side surface being convex; a sixth lens having negative refractive power with an object-side surface being concave and an image-side surface being concave. An effective focal length f of the optical imaging system and half of a maximum field-of-view angle Semi-FOV of the optical imaging system may satisfy f*tan(Semi-FOV)>4.4 mm.