Seven-Lens Imaging Layout for Wide-Angle Distortion Control
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Solution Overview
Problem
Small-sized cameras mounted on wireless terminal devices face challenges in achieving high performance with wide fields of view due to limited mounting space, particularly experiencing severe distortion at angles of 100 degrees or more.
Innovation Solution
An imaging lens system comprising seven lenses with specific refractive powers and surface configurations, including concave and convex surfaces, is designed to reduce distortion while maintaining a field of view of 100 degrees or more, adhering to specific conditional expressions for optimal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a small-sized camera is mounted in a wireless terminal device with limited space, then the device size is reduced, but severe distortion occurs at wide field of view angles of 100 degrees or more
Solution Approach 1:
The imaging lens system is divided into seven individual lens elements with alternating positive and negative refractive powers. Each lens element contributes to correcting specific aberrations, with the first lens having positive power and subsequent lenses alternating between negative and positive powers to progressively reduce distortion across the wide field of view
Solution Approach 2:
Different lens elements are designed with specific local optical properties - the first lens has a concave object-side surface with positive refractive power, while the second lens has negative refractive power, and this pattern continues through all seven lenses. Each lens element is optimized for its specific position and function within the overall system to address distortion at different field angles
2Area of moving object
If the field of view is increased to 100 degrees or more, then the imaging coverage is improved, but severe distortion occurs
Solution Approach 1:
The lens system employs specific parameter relationships to control distortion while maintaining wide field of view. The conditional expressions define optimal ranges for focal lengths, distances between lens elements, and refractive powers. For example, the focal length of the first lens is constrained relative to the focal length of the imaging lens system, and distances between adjacent lenses are optimized to balance field of view and distortion correction
3Object-affected harmful factors
If seven lenses are used to reduce distortion, then optical performance is improved, but device complexity increases
Solution Approach 1:
Multiple lens elements are combined into a single integrated imaging lens system where the seven lenses work together as one optical unit. The lenses are arranged in a specific sequence with alternating refractive powers, and their combined effect achieves distortion correction that would be difficult to obtain with fewer elements. The system merges the functions of multiple lenses into a compact configuration suitable for mobile devices
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 imaging lens system effectively reduces spherical, curvature, and distortion aberrations, achieving a wide field of view with improved optical performance.
Implementation Method 1
An imaging lens 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 order from an object side. In the imaging lens system, the first lens has positive refractive power and an object-side surface of the first lens is concave.
Data Source
AI summary
An imaging lens 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 order from an object side. In the imaging lens system, the first lens has positive refractive power and an object-side surface of the first lens is concave. A field of view of the imaging lens system is 100 degrees or more. In the imaging lens system, a distance TTL from the object-side surface of the first lens to an imaging plane and a height ImgH of the imaging plane satisfy TTL/ImgH<1.5.