Document Reading Device Closing Member Design
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Solution Overview
Problem
Document reading devices with sliding glass plates and reference members are prone to foreign matter entry, leading to image distortion due to dust and debris accumulation, causing stripe issues in the read images.
Innovation Solution
A document reading device with a closing member that fills the space between the glass plate and reading unit, sliding between positions to prevent foreign matter entry, and using a lubricant and elastic components to facilitate smooth movement and reduce friction, thereby minimizing dust adherence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a space is maintained between the glass plate and reading unit to enable sliding movement, then the glass plate can be moved between reading positions, but foreign matters such as dust can enter inside the device through the space
Solution Approach 1:
A closing member is introduced to cover the space between the glass plate and reading unit, preventing foreign matter entry while allowing the glass plate to slide. The closing member acts as a flexible barrier that maintains the necessary operational space while blocking dust and debris from entering the internal components.
2Measurement precision
If the glass plate is slid with a space maintained between it and the reading unit, then the reference member can be positioned for shading correction, but foreign matters may adhere to the reference member and glass plate causing image stripes
Solution Approach 1:
The closing member covers the space where the glass plate and reference member are located, preventing foreign matter from adhering to these critical components. This ensures that shading correction measurements remain accurate and that no stripe artifacts appear in the final images due to dust or debris on the optical surfaces.
Data Source
AI summary
Provided is a document reading device capable of performing shading correction and making it difficult for foreign matters to enter inside the device. A document reading device includes a reading unit, a glass unit, and a closing member. The reading unit has a light source and reads a document. The glass unit has a glass plate that transmits light emitted from the light source and a reference member serving as a reference for shading correction of a reading optical system. The glass unit is disposed with a space provided with respect to the reading unit and slid between a first position where the light emitted from the light source transmits the glass plate and a second position where the light emitted from the light source reaches the reference member with the space being maintained. The closing member is positioned downstream of the glass plate and the reference member of the glass unit in a document conveying direction and fills at least a part of the space provided between the reading unit and the glass unit.