Five-Lens Optical Imaging System with High Refractive Index Elements
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Solution Overview
Problem
Small camera modules in mobile communications terminals face challenges in achieving a low F-number and wide field of view due to the limitations of optical imaging systems with a small number of lenses.
Innovation Solution
An optical imaging system comprising five lenses, where the first, third, and fifth lenses have refractive indices of 1.6 or more, with convex object-side surfaces and specific focal lengths, allowing for a field of view of 100° or more and an F-number less than 2.3, while maintaining a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a small number of lenses (four or fewer) are used in the optical imaging system, then the camera module can be made thin and compact, but it becomes difficult to achieve a low F-number and wide field of view
Solution Approach 1:
The optical imaging system is divided into five distinct lens elements (first through fifth lenses) with specific refractive index requirements (≥1.6) for the first, third, and fifth lenses. This segmentation allows each lens to contribute differently to light gathering and focusing, enabling a low F-number (less than 2.3) while maintaining a compact overall structure suitable for thin camera modules.
2Length of moving object
If a small number of lenses (four or fewer) are used in the optical imaging system, then the camera module can be made thin and compact, but it becomes difficult to achieve a wide field of view (100° or more)
Solution Approach 1:
Different lens elements are assigned specific local qualities through their refractive indices (first, third, and fifth lenses have refractive indices of 1.6 or more) and surface configurations (convex object-side surfaces). This local differentiation allows the system to achieve a wide field of view (100° or more) while maintaining a thin overall profile, as each lens element is optimized for its specific position and function in the optical path.
3Illumination intensity
If five or more lenses are used in the optical imaging system, then a low F-number and wide field of view can be achieved, but the camera module becomes larger and less compact
Solution Approach 1:
The patent specifies precise parameter ranges for the five lens elements, including refractive indices (≥1.6 for first, third, and fifth lenses) and surface configurations (convex object-side surfaces). By carefully controlling these parameters, the system achieves a low F-number (less than 2.3) and wide field of view (100° or more) with exactly five lenses, avoiding the need for more complex multi-lens systems while maintaining optimal optical performance.
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 enables a mobile communications terminal with a low F-number and wide field of view, enhancing imaging capabilities while maintaining a thin and compact form factor.
Implementation Method 1
An optical imaging system may include a first lens, a second lens, a third lens, a fourth lens, and a fifth lens sequentially arranged from an object side, wherein the first lens, the third lens, and the fifth lens each have a refractive indices index of 1.6 or more
Data Source
AI summary
An optical imaging system includes: a first lens having refractive power, a second lens having refractive power, a third lens having refractive power, a fourth lens having refractive power, and a fifth lens having refractive power. Here, the first lens, the third lens, and the fifth lens may have refractive indices of about 1.6 or more, and an entire field of view of the optical imaging system may be about 120° or more.