Six-Lens Imaging Lens for Wide-Angle High Resolution
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Solution Overview
Problem
Existing imaging lenses for sensing cameras, particularly those with a wide angle of view greater than 100°, suffer from inefficient light accumulation at peripheral portions due to high incident angles of principal light rays, which hampers resolution and is unsuitable for imaging elements with large capturing areas.
Innovation Solution
A six-lens imaging lens configuration with specific refractive powers and surface curvatures, including a negative first lens, negative second lens, positive third lens, convex fourth lens, positive fifth lens, and negative sixth lens, optimized by conditional formulae to control focal lengths, radii of curvature, and Abbe's numbers, ensuring efficient light distribution and aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a wide angle of view (100° or greater) is achieved, then the field of vision coverage is improved, but the incident angles of principal light rays become great causing inefficient light accumulation at peripheral portions
Solution Approach 1:
The imaging lens is divided into six distinct lens elements with alternating positive and negative refractive powers. This segmentation allows each lens to contribute differently to light ray control, enabling the system to achieve wide angle coverage while managing incident angles at the image plane through cumulative refraction effects across multiple elements.
Solution Approach 2:
Different lens elements are designed with specific local optical properties - the first lens has a concave surface toward the image side to control peripheral rays, the third and fifth lenses have convex surfaces toward the image side to converge light, and the sixth lens has a concave surface toward the object side. This local differentiation of optical characteristics enables precise control over light distribution across the imaging plane.
2Area of stationary object
If a wide angle of view is achieved with high incident angles, then the angle of view is improved, but the resolution is degraded due to inefficient light accumulation
Solution Approach 1:
The lens system dynamically controls light ray trajectories through a sequence of refractions at six different lens interfaces. The conditional formulas constrain the focal lengths and refractive powers to ensure that light rays from wide angles are progressively redirected, transforming the dynamic path of peripheral rays to achieve optimal incident angles at the image plane despite the wide field of view.
Solution Approach 2:
The patent specifies precise parameter ranges through conditional formulas: 0.15 < f1/f2, 0.5 < f3/f, and -1.9 < f12/f. These parameter constraints optimize the optical performance by controlling the strength of refraction at each lens element, ensuring that the cumulative effect produces appropriate light convergence angles at the image plane for high-resolution imaging across the wide field of view.
3Manufacturing precision
If imaging elements with large image capturing areas are used to increase resolution, then the resolution is improved, but the configuration with great incident angles becomes more disadvantageous
Solution Approach 1:
The six-lens system acts as an intermediary optical train between the wide-angle scene and the large-area imaging element. Each lens element serves as a mediator that progressively adjusts the light ray angles, transforming highly oblique incident rays into rays with more favorable incident angles at the image plane, thereby enabling efficient light accumulation across large imaging areas.
Solution Approach 2:
The imaging lens employs a composite optical system combining six different lens elements with alternating positive and negative refractive powers. This composite structure allows the system to handle complex optical requirements - the negative power lenses diverge rays to control field curvature and distortion, while positive power lenses converge rays to ensure proper focus and light accumulation efficiency across the entire imaging plane.
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 achieves high resolution imaging with a wide angle of view while suppressing higher order aberrations and distortion, enabling high-quality wide-angle images.
Implementation Method 1
a first lens L1 having a negative refractive power and a concave surface toward the image side
Implementation Method 2
a third lens L3 having a positive refractive power and a convex surface toward the image side
Implementation Method 3
a fifth lens L5 having a positive refractive power and a convex surface toward the image side
Data Source
AI summary
An imaging lens includes, in order from the object side to the image side: a first lens having a negative refractive power and a concave surface toward the image side; a positive second lens having a negative refractive power; a third lens having a positive refractive power and a convex surface toward the image side; a fourth lens having a convex surface toward the image side; a fifth lens having a positive refractive power and a convex surface toward the image side; and a sixth lens having a negative refractive power and a concave surface toward the object side. Predetermined conditional formulae related to first lens, the second lens, and the third lens are satisfied.