Image Reading Housing Curved Interface Warpage Compensation
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Solution Overview
Problem
Conventional image-reading apparatuses suffer from warpage of the housing, leading to misalignment of the document reading position and a drop in modulation transfer function (MTF) performance due to uneven gaps between the housing, transparent plate, and platen roller, resulting in out-of-focus images.
Innovation Solution
The image-reading apparatus features a housing with flat first and second layers on its long sides, where the interface between these layers is curved, ensuring a uniform gap and maintaining the flatness of the transparent plate along the main scanning direction, thus preventing warpage and maintaining image focus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the housing is made with simple structure and material, then manufacturing cost and ease of manufacture are improved, but the housing warps under operational conditions causing reading position shift
Solution Approach 1:
The housing is divided into multiple layers: a first housing layer and a second housing layer. The first layer provides structural support while the second layer compensates for warpage, allowing each layer to be manufactured independently and then combined to achieve dimensional stability.
Solution Approach 2:
The interface between the first and second housing layers has a specific curved shape that varies locally to compensate for warpage in specific regions. This local geometric adjustment ensures uniform gap maintenance without requiring the entire housing structure to be complex.
2Device complexity
If the housing structure is simplified, then device complexity is reduced, but uniform gap between housing, transparent plate, and platen roller cannot be maintained
Solution Approach 1:
The housing is segmented into multiple layers with distinct functions. The first layer maintains the overall structure while the second layer specifically compensates for gap variations, allowing simplified individual components to achieve precise combined performance.
Solution Approach 2:
The interface between housing layers incorporates a curved surface that compensates for warpage. This curved geometry at the interface allows the housing to maintain a uniform gap with the transparent plate and platen roller despite operational warpage, without requiring complex adjustment mechanisms.
3Manufacturing precision
If the transparent plate is made flat and rigid, then manufacturing precision is improved, but the housing warpage causes misalignment of reading position
Solution Approach 1:
The second housing layer incorporates a curved interface that provides local compensation for warpage. This localized geometric adjustment ensures that even when the housing warps, the reading position remains aligned by compensating for the warpage effect at the critical interface region.
Solution Approach 2:
The curved interface between housing layers is designed in advance to counteract expected warpage. This preliminary geometric preparation opposes the warpage effect before it can cause misalignment, maintaining reading position accuracy despite housing deformation.
4Strength
If the housing is made with higher strength material, then warpage resistance is improved, but manufacturing cost increases
Solution Approach 1:
The housing is divided into multiple layers that can be manufactured from different materials optimized for their specific functions. This allows cost-effective material selection where each layer is made from the most suitable material rather than requiring expensive high-strength material throughout the entire structure.
Solution Approach 2:
The housing combines different materials in multiple layers, where each layer is optimized for its specific function. This composite structure achieves the required strength and warpage resistance while maintaining cost-effectiveness by using appropriate materials for each layer rather than uniformly expensive material throughout.
Data Source
AI summary
An image-reading apparatus includes a housing having a rectangular-shaped opening on a side of a reading target, a lens portion retained or housed within the housing, and a sensor element to receive light condensed by the lens portion, the light being from the reading target. Long sides of the opening include a first layer that is flat and is disposed on the side of the reading target and a second layer that is continuous with the first layer. The long sides of the opening of the housing of the image-reading apparatus has a flat surface on the side of the reading target and an interface between the first layer and the second layer that is curved.