Laser Scanning Unit Mirror Lens Support Structure
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Solution Overview
Problem
The arrangement accuracy of mirrors and lenses in laser scanning units affects the precision of electrostatic latent image writing in color image forming apparatuses, particularly due to inadequate support structures during assembly, which complicates the assembly process and can lead to inaccuracies in image formation.
Innovation Solution
A laser scanning unit with a housing that includes a support structure for mirrors and lenses, utilizing both two-point and one-point support portions alternately arranged in a direction intersecting with the scanning direction, and fastening members that securely attach both end portions of the mirrors and lenses to specific support portions within the housing, allowing for efficient assembly using a robot arm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If mirrors and lenses are supported at three positions (two at one end, one at the other), then the support structure is simple, but the arrangement accuracy of mirrors and lenses deteriorates
Solution Approach 1:
The support structure is segmented into multiple support portions (first through fourth support portions) distributed at different locations along the optical path. Each support portion provides localized support at critical positions, dividing the support function into discrete segments rather than concentrating support at end portions. This segmentation enables precise positioning of mirrors and lenses while maintaining structural simplicity.
Solution Approach 2:
The support portions are pre-positioned at optimal locations along the optical path before assembly. The first support portion is positioned near the first end of the mirror, the second support portion near the second end of the mirror, the third support portion near the first end of the lens, and the fourth support portion near the second end of the lens. This preliminary positioning ensures that mirrors and lenses are supported at critical locations that maintain arrangement accuracy during subsequent assembly operations.
2Manufacturing precision
If complex support structures are used to improve arrangement accuracy, then manufacturing precision improves, but assembly efficiency deteriorates
Solution Approach 1:
The housing is divided into multiple support portions positioned at different locations along the optical path. Each support portion is a simple, discrete structure that can be easily manufactured and assembled. This segmentation into simple, standardized support elements enables rapid assembly while maintaining precise arrangement accuracy, as each support portion can be independently positioned and secured without complex interdependencies.
Solution Approach 2:
Multiple support portions are used throughout the housing, providing uniform support characteristics at different locations. The support portions share similar structural features and functions, creating a homogeneous support system that simplifies manufacturing and assembly. This homogeneity allows for standardized assembly procedures and reduces the complexity of handling different support structures during assembly.
3Manufacturing precision
If mirrors and lenses are alternately arranged with intervals, then optical path precision is improved, but device complexity increases
Solution Approach 1:
The internal space of the housing is segmented into alternating regions for mirrors and lenses, with intentional intervals between components. The first mirror, first lens, second mirror, and second lens are arranged in sequence along the optical path with spacing between them. This segmentation creates a regular, repeating pattern that simplifies the overall design while maintaining precise optical path geometry. The intervals between components are carefully controlled to ensure optimal optical performance.
Solution Approach 2:
The alternating arrangement of mirrors and lenses creates an asymmetric optical path configuration that optimizes light propagation. The mirrors and lenses are positioned at different locations with different orientations, creating an asymmetric layout that is tailored to the specific optical requirements. This asymmetric arrangement, combined with the alternating pattern, enables precise control of the optical path while avoiding the need for overly complex symmetric structures.
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 enhances the assembly efficiency and stability of mirrors and lenses, improving the accuracy of electrostatic latent image writing and overall image formation by ensuring precise alignment and attachment, thus addressing the challenge of arrangement accuracy.
Implementation Method 1
The plurality of mirrors are arranged inside the housing along a first direction and respectively reflect a plurality of laser light beams
Implementation Method 2
The plurality of lenses are arranged inside the housing along a first direction. The plurality of laser light beams respectively pass through the plurality of lenses
Data Source
AI summary
A plurality of two-point mirror support portions each support two positions of a mirror specific surface at an end portion of each of a plurality of mirrors on a first side of a first direction. A plurality of one-point mirror support portions each support one position of the mirror specific surface or an end surface at an end portion of each of the plurality of mirrors on a second side of the first direction. A plurality of two-point lens support portions each support two positions of a lens specific surface of each of a plurality of lenses at an end portion on the second side of the first direction. A plurality of one-point lens support portions each support one position of the lens specific surface of each of the plurality of lenses at an end portion on the first side of the first direction.