Six-Lens Optical Imaging System for Compact Portable Devices
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Solution Overview
Problem
The challenge is to design an optical imaging lens that is lighter, thinner, and shorter with a smaller F-number while maintaining good imaging quality for portable electronic devices, which existing designs have not adequately addressed.
Innovation Solution
A six-lens element optical imaging lens configuration is proposed, with specific surface shapes and refracting powers for each lens element, along with carefully controlled air gaps and thicknesses, to achieve reduced system length and improved optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of lens elements is increased to improve imaging quality, then imaging quality is improved, but system length and weight increase
Solution Approach 1:
The optical system is divided into six distinct lens elements with specific surface shapes and refracting powers. Each lens element is optimized for specific aberration correction, allowing the system to achieve high imaging quality while maintaining a compact form factor through functional segmentation of the optical path.
Solution Approach 2:
Different regions of the lens elements (optical axis region vs. periphery region) have different surface shapes tailored to local optical requirements. For example, the first lens element has a convex optical axis region on the object-side surface and a concave periphery region, allowing simultaneous correction of on-axis and off-axis aberrations within a compact structure.
2Use of energy by moving object
If the F-number is reduced to increase luminous flux, then luminous flux is increased, but aberration control becomes more difficult
Solution Approach 1:
The patent specifies precise parameter ranges for lens element properties including refracting powers (e.g., positive refracting power for the first element, negative for the second), surface curvatures, and thickness ratios (e.g., T1/T2, T3/T4). These parameter optimizations enable the system to maintain small F-number for high luminous flux while correcting aberrations through carefully balanced optical parameters.
Solution Approach 2:
The optical system uses lens elements with different Abbe numbers (ν2, ν3, ν4, ν5) to achieve chromatic aberration correction. By combining materials with different dispersive properties, the system can maintain small F-number for high luminous flux while controlling chromatic and other aberrations through material diversity.
3Length of stationary object
If lens element thickness is reduced to make the system thinner, then system thickness is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent defines specific thickness ratios between adjacent lens elements (e.g., T1/T2, T3/T4) and air gap ratios (e.g., G12/G23, G45/G56) within precise ranges. These parameter specifications enable thin lens elements to be manufactured with controlled precision by providing design flexibility while maintaining optical performance through ratio-based constraints rather than absolute dimension requirements.
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 configuration results in a lens system with a smaller F-number, reduced system length, and maintained imaging quality, addressing the need for a compact and high-performance optical solution for portable devices.
Implementation Method 1
Each first lens element, second lens element, third lens element, fourth lens element, fifth lens element and sixth lens element respectively has an object-side surface which faces toward the object side and allows imaging rays to pass through as well as an image-side surface which faces toward the image side and allows the imaging rays to pass through
Data Source
AI summary
An optical imaging lens has six lens elements. A periphery region of the image-side surface of the first lens element is concave, an periphery region of the object-side surface of the third lens element is concave, an optical axis region of the object-side surface of the sixth lens element is concave, a periphery region of the object-side surface of the sixth lens element is convex, an optical axis region of the image-side surface of the sixth lens element is concave and a periphery region of the image-side surface of the sixth lens element is convex. AAG is a sum of five air gaps, T6 is a thickness of the sixth lens element and the Abbe number of the second, the third, the fourth, the fifth is ν2, ν3, ν4 and ν5 to satisfy ν2+ν3+ν4+ν5≤135.000 and AAG/T6≤2.900.