Seven-Lens Optical Imaging System Compact Design
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Solution Overview
Problem
Existing optical imaging lenses face challenges in achieving a balance between slim and compact size, good imaging quality, and low f-number while maintaining a sufficient image height, which is essential for portable electronic devices like mobile phones and digital cameras.
Innovation Solution
The design of a seven-lens optical imaging lens system with specific refracting powers and surface shapes, including convex and concave regions, that satisfies certain inequalities to optimize system length, f-number, and image height, ensuring good imaging quality and compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If more lens elements are used to improve imaging quality, then aberrations and chromatic aberration are reduced, but the distance from the object-side surface to the imaging plane increases, making the device less compact
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive indices and Abbe numbers of the seven lens elements to satisfy specific inequalities (e.g., 1.500 < n1 < 1.700, 20.000 < V1 < 40.000). This allows the lens system to achieve good imaging quality with reduced aberrations while maintaining a compact form factor through precise control of optical parameters
Solution Approach 2:
The patent segments the optical system into seven distinct lens elements with specific refracting powers (positive or negative) arranged in sequence. Each lens element is designed with specific surface shapes (convex/concave regions) to distribute optical functions, allowing correction of aberrations without requiring excessive overall length
2Illumination intensity
If small f-number is achieved to increase luminous flux, then night sight function is improved, but image height may be reduced
Solution Approach 1:
The patent achieves small f-number (0.500 < Fno < 1.500) by optimizing parameters including the focal length of individual lens elements (e.g., 0.500 < f1/EFL < 1.500) and the overall optical configuration. This allows increased luminous flux for improved night sight function while maintaining sufficient image height (ImgH/EFL > 0.300) through coordinated parameter control
3Area of stationary object
If great image height is achieved to increase pixel size and receiving capability, then imaging quality is improved, but system length increases
Solution Approach 1:
The patent maintains great image height relative to focal length (ImgH/EFL > 0.300) while controlling system length through optimized lens element parameters. The seven-lens configuration with specific refractive powers and surface shapes enables sufficient image height for large pixel sizes without proportionally increasing overall system length
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 solution effectively shortens the system length, decreases the f-number, and increases the image height, thereby providing improved imaging quality and compactness for portable devices.
Implementation Method 1
Each of the first, second, third, fourth, fifth, sixth and seventh lens element may also have an object-side surface facing toward the object side and allowing imaging rays to pass through and an image-side surface facing toward the image side and allowing the imaging rays to pass through
Data Source
AI summary
The present invention provides an optical imaging lens. The optical imaging lens comprises seven lens elements positioned in an order from an object side to an image side. Through controlling the convex or concave shape of the surfaces of the lens elements, the optical imaging lens may be provided with shortened system length, decreased Fno, increased field of view and image height.