Seven-Lens Optical Imaging Layout for Thin High-Resolution Cameras
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Solution Overview
Problem
Small-sized cameras in portable terminals face limitations in achieving high-resolution and high-performance imaging due to restricted mounting space, necessitating a compact optical imaging system with improved performance.
Innovation Solution
An optical imaging system comprising seven lenses, including specific refractive indices, focal lengths, and surface configurations, optimized to satisfy conditional expressions for miniaturization and aberration correction, utilizing plastic materials and aspherical surfaces for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the size of sensor and overall length of lens are increased to achieve high resolution and high performance, then imaging performance is improved, but the size and weight of portable terminal increase
Solution Approach 1:
The optical imaging system is divided into seven separate lens elements (first lens through seventh lens) with alternating positive and negative refractive powers. This segmentation allows each lens element to be optimized for specific functions (e.g., correction of chromatic aberration, distortion aberration, and spherical aberration) while collectively achieving high-resolution imaging in a compact form factor
Solution Approach 2:
The patent specifies precise parameter ranges for each lens element including refractive indices (e.g., 1.6 or more for second, fourth, and fifth lenses), focal lengths (e.g., f2/f0 between -10 to -2), and curvature radii. These parameter optimizations enable compact lens design while maintaining high imaging performance through controlled aberration correction
2Measurement precision
If the number of lenses is increased to correct aberrations and improve imaging quality, then imaging performance is improved, but device complexity increases
Solution Approach 1:
Each lens element is assigned specific local optical properties: the second, fourth, and fifth lenses use high refractive index materials (1.6 or more) for compactness, while the first and third lenses use lower refractive index materials. This local differentiation allows effective aberration correction with minimized overall system complexity
Solution Approach 2:
The patent employs asymmetric lens configurations with alternating positive and negative refractive powers in a specific sequence. The lens surfaces feature asymmetric curvature radii (e.g., first surface r1 = 2.301mm, second surface r2 = 8.456mm) that are optimized to correct various aberrations while maintaining compact design
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 high-resolution and compact optical imaging solution with reduced thickness, effectively correcting chromatic and distortion aberrations, ensuring a wide field of view and improved imaging quality.
Implementation Method 1
a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens disposed in sequence from an object side... the second lens, the fourth lens, and the fifth lens have a refractive index of 1.6 or more
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, and a seventh lens disposed in sequence to be spaced apart from an object side. The second lens, the fourth lens, and the fifth lens have a refractive index of 1.6 or more, and the optical imaging system satisfies the following conditional expression: OAL/2IMH<0.6, where OAL is a distance from an object-side surface of the first lens to an image plane, and 2IMH is a diagonal length of the image plane.