Wide-Angle Optical Lens Assembly With Stray Light Interception
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Solution Overview
Problem
Existing optical imaging lenses face challenges in achieving a wide viewing angle while minimizing edge field-of-view performance risks, such as image blurring, due to the positioning of the inflection point and curvature offset of the first lens.
Innovation Solution
An optical imaging lens assembly with a specific configuration of lenses and spacing elements, including a first lens with negative refractive power and controlled curvature radius, and spacing elements positioned to intercept non-imaging light and adjust the inflection point, ensuring 0.75<2×Yc11/d1s<1.25 and −3.45<R1/f<2.75, to correct off-axis aberrations and maintain good wide-angle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the inflection point of the first lens is positioned closer to the optical axis to achieve a wide viewing angle, then the viewing angle is increased, but the curvature offset of the external field of view becomes severe causing image blurring
Solution Approach 1:
A spacing element is introduced between the first lens and the second lens as an intermediary component. This spacing element intercepts non-imaging light (stray light) that would otherwise cause curvature offset and image blurring in the external field of view, while allowing the inflection point to remain positioned for wide-angle performance. The spacing element acts as a mediator that resolves the conflict between wide viewing angle and edge field-of-view quality.
2Manufacturing precision
If the inflection point is positioned closer to the maximum effective radius of the first lens to reduce curvature offset, then edge field-of-view performance is improved, but the external field of view is intercepted more resulting in image blurring
Solution Approach 1:
The spacing element converts the harmful effect of non-imaging light (which causes image blurring) into a beneficial filtering function. By strategically positioning the spacing element, it intercepts stray light that would degrade imaging quality, thereby converting a potential harm (light interception) into a benefit (improved image clarity and reduced blurring).
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 effectively corrects off-axis aberrations and improves imaging stability by intercepting non-imaging light, ensuring concentrated focal points and enhanced MTF performance across various field views.
Implementation Method 1
a first lens with a negative refractive power
Implementation Method 2
the spacing element group includes a first spacing element... to intercept non-imaging light
Implementation Method 3
ensuring concentrated focal points and enhanced MTF performance
Data Source
AI summary
An optical imaging lens assembly. The optical imaging lens assembly includes a lens cone, and a lens group and a spacing element group, which are arranged in the lens cone. The lens group sequentially includes from an object side to an image side along an optical axis: a first lens with a negative refractive power, a second lens with a refractive power, a third lens with a refractive power, a fourth lens with a refractive power, a fifth lens with a refractive power and a sixth lens with a negative refractive power. Image-side surfaces of the second lens, the third lens and the fifth lens are all convex surfaces. An object-side and image-side surface of the fourth lens are both convex or concave surfaces. The spacing element group includes a first spacing element. The optical imaging lens assembly satisfies: −3.45<R1/f<2.75 and 0.75<2×Yc11/d1s<1.25.