Seven-Lens Optical Layout for Compact 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, using plastic materials with varying optical properties for each lens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor size and overall lens length are increased to achieve high resolution and high performance, then the imaging performance is improved, but the camera size and weight increase
Solution Approach 1:
The patent applies parameter changes by selecting specific refractive indices for each lens element (e.g., first lens: 1.505-1.600, second lens: 1.650-1.750, third lens: 1.500-1.600) and controlling curvature radii within defined ranges. This allows optimization of light refraction and focal properties to achieve high-resolution imaging with a compact overall lens length of 4.8-5.2mm
Solution Approach 2:
The patent uses composite material principles by combining multiple lens elements made from different plastic materials with varying optical properties. Each lens element has specifically selected refractive index and Abbe number characteristics, creating a composite optical system that achieves superior imaging performance while maintaining miniaturization
2Measurement precision
If the sensor size and overall lens length are increased to achieve high resolution and high performance, then the imaging performance is improved, but the camera weight increases
Solution Approach 1:
The patent optimizes material parameters by selecting plastic lens materials with specific refractive indices and Abbe numbers within defined ranges. This enables achieving high imaging resolution without increasing weight, as the optimized optical design compensates for the smaller sensor size and compact form factor
Solution Approach 2:
The patent employs composite material strategies by using multiple plastic lens elements with different optical characteristics (varying refractive indices and dispersion properties). This composite approach allows the system to achieve high-resolution imaging performance while keeping individual lens elements and overall camera weight minimal
3Volume of moving object
If the mounting space is reduced for portable terminals, then the camera becomes more compact, but the imaging performance deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive indices, Abbe numbers, and curvature radii of each lens element within specific ranges. This optimization enables the compact optical system to correct aberrations effectively and achieve high imaging performance despite the reduced mounting space of 4.8-5.2mm overall length
Solution Approach 2:
The patent implements a nested arrangement of seven lens elements in a compact sequence, with each element carefully positioned and sized to fit within the constrained mounting space. The lenses are nested along the optical axis with optimized spacing, allowing the entire optical system to achieve high performance while maintaining a minimal overall footprint suitable for portable terminals
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 aberrations and ensuring a wide field of view, suitable for portable terminals.
Implementation Method 1
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
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.