Film Sealer for Document Image Capturing Device Dust Control
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Solution Overview
Problem
Document image capturing devices face challenges in maintaining dust-proof performance while ensuring the load generated during module movement remains consistent, as deformable sponge members used for dust prevention can lead to gaps and reduced effectiveness over time.
Innovation Solution
A document image capturing device with a sealer system using two films, one attached to the image capturing module and another to the illumination module, which seals the aperture portions to prevent dust entry and maintain load consistency during movement, ensuring continuous dust-proof performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a deformable sponge member is used to seal between the image capturing module and illumination module, then dust proof performance is improved, but the sponge member deforms during repeated module movement, changing the load and generating gaps that reduce dust proof performance
Solution Approach 1:
The patent replaces the deformable sponge member with a flexible film that has sufficient rigidity to maintain its shape during module movement. The film is configured to follow the movement of the illumination module while maintaining a sealed state, preventing dust entry without deforming like the sponge member. This resolves the contradiction by providing both flexibility for movement accommodation and rigidity for shape stability.
2Adaptability or versatility
If the illumination module is made movable to accommodate thick media, then adaptability is improved, but maintaining consistent load during movement becomes difficult when using deformable sealing members
Solution Approach 1:
The flexible film provides a stable sealing force that does not vary with module position or document thickness. Unlike the sponge member that deforms and changes load characteristics, the film maintains consistent mechanical properties throughout the illumination module's movement range, enabling reliable operation with both thin and thick media.
Solution Approach 2:
The film is designed to dynamically adapt to the illumination module's movement while maintaining sealing effectiveness. The film's flexibility allows it to accommodate the changing position and orientation during document conveyance, while its structural integrity ensures consistent load characteristics throughout the motion.
3Force
If a rigid seal structure is used to maintain load consistency, then movement load stability is improved, but dust proof performance may be compromised due to inability to accommodate module movement
Solution Approach 1:
The flexible film combines the best properties of both rigid and soft sealing structures. It provides the load consistency of rigid structures while incorporating the flexibility needed to accommodate illumination module movement, thereby maintaining both movement load stability and dust proof performance simultaneously.
Data Source
AI summary
A document image capturing device includes an image capturing module for capturing an image of a document, and a first aperture portion, an illumination module movable between the image capturing module and a document conveying path and including a light source for illuminating the document and a second aperture portion, and a sealer for sealing between the first aperture portion and the second aperture portion regardless of movement of the illumination module. The sealer includes a first film attached to cover an entire periphery of the first aperture portion and a second film attached to cover an entire periphery of the second aperture portion, and the first aperture portion and the second aperture portion are arranged so that a reflection light from the document illuminated by the light source passes through the first aperture portion and the second aperture portion.