Light Blocking Member Reflection Surface Stray Light Control
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Solution Overview
Problem
In image scanners, stray light reflected by the inner surfaces of through holes in the light blocking member can cause blurring of the optical image on the image sensor, leading to reduced image quality and precision.
Innovation Solution
The imaging optical element incorporates a lens array with a light blocking member featuring through holes that have inner wall surfaces with reflection surfaces orthogonal to the sub-scanning direction, which redirect stray light away from the optical axis, preventing it from contributing to the primary image formation on the image sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light blocking member with through holes is used to allow necessary light to pass through, then image formation is enabled, but stray light is reflected by inner wall surfaces causing image blurring
Solution Approach 1:
The patent applies the principle of converting harm into benefit by utilizing the inner wall surface of the through hole to reflect stray light in a controlled manner. Instead of allowing stray light to cause blurring, the reflection surface redirects it to positions shifted in the sub-scanning direction, transforming the harmful stray light into a controlled optical element that does not contribute to the primary image, thereby eliminating the blurring effect while maintaining image formation capability
Solution Approach 2:
The patent applies local quality by creating a specific reflection surface at a particular location (the inner wall surface of the through hole) with specific properties (intersecting the sub-scanning direction). This localized modification allows the through hole to have different functional zones: the opening allows necessary light passage, while the inner wall surface provides controlled reflection to eliminate stray light, thus improving image quality without compromising the overall light blocking function
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
This design effectively suppresses blurring by redirecting stray light to positions shifted in the sub-scanning direction, enhancing image quality and precision by minimizing the impact of stray light on the image sensor.
Implementation Method 1
the inner wall surface of the through hole that intersects the main scanning direction includes a reflection surface that intersects the sub-scanning direction, and the reflection surface reflects light incident on the same reflection surface in a direction that intersects the main scanning direction
Data Source
AI summary
A CISM includes a lens array in which a plurality of lenses is arranged in a row form so that the optical axes are parallel to one another, and an incident optical image is formed from one end side in the optical axis direction of the lens array, thereby forming an image on the other end side. The CISM includes a light blocking member in which a plurality of through holes that allow light to pass through is provided in a row form in the arrangement direction. In the light blocking member, the inner wall surface of the through holes that intersects the arrangement direction includes reflection surfaces that intersect a sub-scanning direction. The reflection surfaces reflect light incident on the same reflection surface in a direction that intersects the arrangement direction.