Six-Lens Cemented Imaging Optics for Slim Mobile Resolution
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Solution Overview
Problem
The challenge is to develop an optical system for mobile devices that maintains high resolution while ensuring a slim size, addressing performance degradation due to size constraints.
Innovation Solution
An optical imaging system comprising six lenses, including a cemented lens configuration with specific refractive powers and surface shapes, and adhering to conditional expressions for focal lengths and Abbe numbers, is designed to achieve high resolution and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the size of an image sensor increases, then the total optical length of an optical system increases, but the device size becomes too large for mobile devices
Solution Approach 1:
The optical system is divided into six separate lenses with specific refractive powers arranged in sequence, allowing each lens to contribute to the overall imaging function while maintaining a compact total length. This segmentation enables the system to achieve high resolution without requiring a proportionally large image sensor area.
Solution Approach 2:
The patent employs specific refractive power values for each lens (positive, negative, positive, negative, positive, negative) and controls the total optical length through conditional expressions involving focal lengths and Abbe numbers. By optimizing these parameters, the system achieves high resolution imaging within a compact form factor suitable for mobile devices.
2Volume of moving object
If the total optical length is reduced for slim device design, then the device size decreases, but optical performance degrades
Solution Approach 1:
The patent combines multiple lenses with alternating positive and negative refractive powers into a single compact optical train. The cemented lens configuration merges adjacent lenses to reduce air gaps and minimize aberrations, maintaining optical performance while reducing overall system length for slim device design.
Solution Approach 2:
The optical system uses a composite lens structure with lenses made of different materials having specific refractive indices and Abbe numbers. This composite approach allows for optimized light transmission and aberration correction within a compact total optical length, preserving high optical performance in a slim device configuration.
3Device complexity
If a cemented lens is used to reduce the number of air gaps, then manufacturing complexity decreases, but chromatic aberration increases
Solution Approach 1:
The patent applies different refractive powers and Abbe numbers to specific lenses within the cemented lens structure. By assigning positive refractive power to certain lenses and negative refractive power to others, with specific Abbe number constraints, the system locally optimizes to correct chromatic aberration while maintaining the manufacturing advantages of cemented lens construction.
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 high-resolution imaging with a slim form factor, minimizing chromatic aberration and ensuring optical performance, while being suitable for integration into mobile devices.
Implementation Method 1
a first lens having positive refractive power, a second lens having negative refractive power, a third lens having positive refractive power, a fourth lens having negative refractive power, a fifth lens having positive refractive power, and a sixth lens having negative refractive power
Data Source
AI summary
An optical imaging system includes a first lens having positive refractive power, a second lens having negative refractive power, a third lens having positive refractive power, a fourth lens having negative refractive power, a fifth lens having positive refractive power, and a sixth lens having negative refractive power, disposed in order from an object side, and a cemented lens, wherein the cemented lens includes the first lens and the second lens or the third lens and the fourth lens.