Imaging Lens Connection Portion Stray Light Control
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Solution Overview
Problem
Conventional optical verification systems suffer from excessive stray light reflection due to the high reflectivity of plastic optical lenses, leading to ghost images and reduced verification ability.
Innovation Solution
An imaging lens assembly with a connection portion between the image side surface of the optical zone and the image side surface of the non-optical zone, featuring an inclined surface, arc angle, or convex surface to prevent stray light from entering the image sensing element, thereby improving image quality and verification ability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If plastic optical lenses with smooth and bright surfaces are used to reduce manufacturing costs, then manufacturing cost is reduced and ease of manufacture is improved, but stray light reflection increases leading to ghost images and reduced image quality
Solution Approach 1:
The patent applies local quality by modifying only specific regions of the optical lens - the edge portions and connection portions - while maintaining the smooth and bright surface quality of the main optical zones. This selective modification reduces stray light reflection at critical locations without compromising the overall manufacturing simplicity or optical performance of the lens.
Solution Approach 2:
The patent converts the harmful stray light reflection into a beneficial effect by designing connection portions with specific geometric features (inclined surfaces, arc angles) that redirect reflected light away from the image sensing element. The smooth surface that causes reflection is transformed into a controlled light-redirection feature that prevents ghost images.
2Ease of manufacture
If conventional smooth and bright plastic optical lens surfaces are used, then manufacturing cost is reduced, but image quality deteriorates due to ghost images from stray light
Solution Approach 1:
The patent applies local quality by modifying only specific regions of the optical lens - the edge portions and connection portions - while maintaining the smooth and bright surface quality of the main optical zones. This selective modification reduces stray light reflection at critical locations without compromising the overall manufacturing simplicity or optical performance of the lens.
Solution Approach 2:
The patent converts the harmful stray light reflection into a beneficial effect by designing connection portions with specific geometric features (inclined surfaces, arc angles) that redirect reflected light away from the image sensing element. The smooth surface that causes reflection is transformed into a controlled light-redirection feature that prevents ghost images.
3Adaptability or versatility
If the field of view is increased to greater than 120 degrees, then adaptability is improved, but stray light reflection between cover plate and optical lenses increases causing ghost images
Solution Approach 1:
The patent applies local quality by modifying only specific regions of the optical lens - the edge portions and connection portions - while maintaining the smooth and bright surface quality of the main optical zones. This selective modification reduces stray light reflection at critical locations without compromising the overall manufacturing simplicity or optical performance of the lens.
Solution Approach 2:
The patent converts the harmful stray light reflection into a beneficial effect by designing connection portions with specific geometric features (inclined surfaces, arc angles) that redirect reflected light away from the image sensing element. The smooth surface that causes reflection is transformed into a controlled light-redirection feature that prevents ghost images.
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 reduces ghost image generation by redirecting stray light, enhancing image quality and increasing the verification ability of the optical verification system.
Implementation Method 1
when stray light is reflected from a surface of another optical lens of the optical lens assembly to a surface of the optical lens made of plastic material, the stray light reflected from the surface of the plastic optical lens cannot be effectively attenuated and will be incident into a surface of the image sensing element
Data Source
AI summary
An imaging lens assembly of an optical verification system with a FOV greater than 120 degrees, and includes optical lenses from an object side to an image side. The one of the optical lens being the closest to the object side includes: an object side surface and an image side surface of an optical zone; an object side surface of a non-optical-zone surrounding the object side surface of the optical zone; an image side surface of a non-optical zone surrounding the image side surface of the optical zone; and a first connection portion disposed between the image side surface of the optical-zone and the image side surface of the non-optical zone, wherein a first angle between a tangential direction of a surface of the first connection portion and the radial direction is in a range of 15 to 50 degrees.