Image Reading Apparatus with Integrated Scale for Non-Standard Sheets
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Solution Overview
Problem
Conventional image reading apparatuses struggle to accurately measure the size of sheets with non-standard sizes using only size indicators for standard sizes, making it difficult for users to position documents correctly.
Innovation Solution
The image reading apparatus includes a transparent member with abutment portions and size indicators for standard sizes, along with a scale to measure the length of sheets, enhancing the visibility and accuracy of size measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If only size indicators indicating standard sizes are provided, then the device is simple and easy to manufacture, but it becomes difficult to measure the size of sheets with non-standard sizes
Solution Approach 1:
The size indicator is designed to serve multiple functions: it indicates standard sheet sizes (A4, A3, etc.) through printed characters while simultaneously functioning as a measurement scale with graduated markings. This allows the same component to handle both standard and non-standard sheet size measurements, eliminating the need for separate measurement tools and resolving the contradiction between measurement precision and device complexity
Solution Approach 2:
The size indicator extends the measurement capability from discrete standard size points to continuous linear measurement by adding scale markings along the length of the indicator. This dimensional extension allows users to measure any sheet size between the standard size markers, transforming the indicator from a limited reference tool into a comprehensive measurement device
2Measurement precision
If a scale is added to measure non-standard sheet sizes, then measurement precision is improved, but the device complexity increases
Solution Approach 1:
The measurement scale is merged with the existing size indicator structure rather than being implemented as a separate component. The scale markings are integrated into the same physical element that displays standard size information, combining multiple measurement functions into a single unified indicator. This merging approach improves measurement precision for non-standard sizes while minimizing the increase in device complexity
Data Source
AI summary
An image reading apparatus includes a transparent member having a placing surface on which a sheet is placed, a first abutment portion against which an edge portion of the sheet on a rear side in a front-rear direction abuts, a second abutment portion against which an edge portion of the sheet on one side in a left-right direction abuts, a first size indicator provided on a rear side with respect to the placing surface and indicates a size of the sheet in the left-right direction, a second size indicator provided on the one side with respect to the placing surface and indicates a size of the sheet in the front-rear direction, and a third size indicator provided on a front side with respect to the placing surface and includes a scale for measuring a length of the sheet in the left-right direction.