Erecting Equal-Magnification Lens Array Plate with Annular Slopes
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Solution Overview
Problem
Erecting equal-magnification lens array plates in image reading devices suffer from ghost noise due to the lack of a wall for beam separation, causing stray light to enter adjacent lenses and create image distortions.
Innovation Solution
The solution involves forming an erecting equal-magnification lens array plate with a stack of lens array plates where each lens is surrounded by an annular slope, reducing the likelihood of light beams passing through adjacent lenses by refracting or reflecting them, and incorporating light-shielding walls with specific hole configurations to prevent stray light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an erecting equal-magnification lens array plate is used without beam separation walls, then the device size is reduced and manufacturing cost is lowered, but ghost noise increases due to stray light entering adjacent lenses
Solution Approach 1:
The patent applies local quality by forming annular slopes only at specific locations around adjacent lenses where stray light interference occurs, rather than adding comprehensive beam separation walls throughout the entire lens array. This localized structural modification selectively addresses the ghost noise problem at critical interfaces while preserving the overall simplicity and cost-effectiveness of the lens array plate design.
2Object-generated harmful factors
If annular slopes are formed around lenses, then ghost noise is reduced by refracting or reflecting stray light, but manufacturing complexity increases
Solution Approach 1:
The patent merges the annular slope structures with the existing lens manufacturing process by forming them as integrated features during the same molding or fabrication operation. This combination eliminates the need for separate post-processing steps to add beam separation structures, thereby reducing manufacturing complexity despite the added functional requirement of ghost noise reduction.
Solution Approach 2:
The annular slopes are designed to automatically refract or reflect stray light through their geometric configuration alone, without requiring additional active components or complex adjustment mechanisms. The structural geometry itself provides the light-control function, making the system self-regulating and simplifying the manufacturing process.
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 configuration effectively reduces ghost noise, improving image quality by ensuring that light beams are directed correctly, thereby enhancing the formation of erect equal-magnification images with reduced distortions.
Implementation Method 1
an annular slope is formed around each second lens and/or each third lens. At least a part of the light beam diagonally incident from the linear light source on the first lens array plate is refracted or reflected by the annular slope
Implementation Method 2
an annular slope is formed around each second lens and/or each third lens. At least a part of the light beam diagonally incident from the linear light source on the first lens array plate is refracted or reflected by the annular slope
Data Source
AI summary
An erecting equal-magnification lens array plate includes: a first lens array plate provided with a plurality of first lenses arranged on a first surface and a plurality of second lenses arranged on a second surface opposite to the first surface; and a second lens array plate provided with a plurality of third lenses arranged on a third surface and a plurality of fourth lenses arranged on a fourth surface opposite to the third surface. The first and second lens array plates form a stack such that the second surface and the third surface face each other. The erecting equal-magnification lens array plate receives light from a linear light source facing the first surface and forms an erect equal-magnification image of the linear light source on an image plane facing the fourth surface. An annular slope is formed around each second lens and each third lens.