Lens Unit Aberration Ray Blocking via Localized Opening Placement
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Solution Overview
Problem
Conventional optical systems used in image forming apparatuses and scanning devices face challenges in blocking aberration rays while maintaining image brightness, often resulting in either a dark or unclear image due to excessive light blockage.
Innovation Solution
A lens unit comprising a first and second lens array with a light blocking member having specific optical axis relationships and opening arrangements, where the intervals between the lens arrays and openings are optimized to block aberration rays while minimizing light blockage, allowing for a clear and bright image formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a light blocking member with openings is arranged to block aberration rays, then image clarity is improved, but image brightness deteriorates
Solution Approach 1:
The patent applies local quality by positioning openings at specific locations (PXL < PXS) where aberration rays pass through, while maintaining light transmission in other regions. This selective local blocking achieves clear images without excessive darkening, as the openings are strategically placed only where needed to block aberration while preserving overall light throughput.
Solution Approach 2:
The patent changes the geometric parameters of the optical system by establishing specific relationships between intervals (PXL < PXS) and positioning openings at calculated distances from the optical axis. This parameter optimization allows the light blocking member to effectively block aberration rays while minimizing light blockage, resolving the contradiction between clarity and brightness.
2Measurement precision
If more light blocking is applied to remove aberration rays, then image quality is improved, but light transmission deteriorates
Solution Approach 1:
The patent applies partial action by blocking only the portion of light that causes aberration (rays passing through the openings at specific intervals) while allowing the majority of light to pass through uninterrupted. This selective partial blocking achieves image quality improvement without excessive light loss, as only the necessary aberration-causing rays are blocked.
Solution Approach 2:
The light blocking member implements local quality by having openings only at specific positions where aberration rays occur, rather than blocking light uniformly across the entire path. This localized approach ensures that light transmission is maintained in regions where aberration does not occur, minimizing overall energy loss while achieving image quality improvement.
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 blocks aberration rays while reducing light blockage, resulting in a clear and bright image, as demonstrated by the test results showing improved illuminance distribution and light beam diameter measurements.
Implementation Method 1
a lens unit including a first lens array including a plurality of first lenses arranged in at least two lines in parallel with a first direction, a second lens array including a plurality of second lenses arranged in an arrangement relationship corresponding to the first lens array, the plurality of second lenses respectively facing the plurality of first lenses of the first lens array
Implementation Method 2
a first light blocking member arranged between the first lens array and the second lens array and having a plurality of first openings each being arranged to face the pair of the first and second lenses in a direction of the optical axis
Data Source
AI summary
A lens unit includes a first lens array including first lenses arranged in at least two lines; a second lens array including second lenses arranged in an arrangement relationship corresponding to the first lens array, the second lenses respectively facing the first lenses, the second lens array being arranged to face the first lens array so that each pair of the first and second lenses has a common optical axis; and a first light blocking member arranged between the first lens array and the second lens array and having first openings each being arranged to face the pair of the first and second lenses in a direction of the optical axis. An interval PXL from an array center position between two adjacent lines to the optical axis and an interval PXS from the array center position to an opening center of the first opening satisfy PXL<PXS.