Image Forming Apparatus Test Data Correction for Large Paper
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Solution Overview
Problem
Existing image forming apparatuses face challenges in accurately forming images on paper sizes larger than the paper placement table, as they cannot read and correct for the entire image size due to size limitations, leading to misregistration and magnification errors.
Innovation Solution
The apparatus includes a test image formation mode that calculates correction amounts by reading and processing a test image larger than the paper placement table size, using identification images and a correction-amount calculation unit to store and apply correction data for precise image formation on larger paper sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the paper placement table size is increased to accommodate larger paper sizes, then the image formation capability on larger paper is improved, but the device complexity and cost increase
Solution Approach 1:
The test image is divided into multiple regions with identification images dispersed throughout, allowing the reading section to read and process portions of the test image in multiple orientations without requiring the entire paper to fit on the placement table at once
Solution Approach 2:
The solution adds the dimension of multiple reading orientations (0°, 90°, 180°, 270°) to overcome the limitation of the fixed-size placement table, enabling coverage of larger paper areas by rotating the paper and reading different portions in different orientations
2Manufacturing precision
If correction amounts are calculated for larger paper sizes, then image placement accuracy is improved, but the measurement and reading process becomes more complex
Solution Approach 1:
Different types of identification images (first, second, third, fourth types) are used to represent different orientations and regions, enabling the system to automatically determine orientation and position through image recognition rather than complex mechanical measurement
Solution Approach 2:
The test image itself contains all the information needed for correction calculation through its dispersed identification images, allowing the system to automatically determine orientation and position without external measurement devices or complex manual intervention
Data Source
AI summary
An image forming apparatus includes a document reading section and an image forming section. The document reading section reads a document image placed on a paper placement table and generates image data. The image forming section forms an image on a sheet of paper on the basis of the image data, and includes a memory that stores test data representing a test image, which is to be formed on a sheet of paper having a size larger than the size of the table, a correction-amount calculation unit that calculates correction amounts on the basis of image data representing the test image which is formed on the sheet of paper and which has been read by repeating an operation, and a correction-amount memory that stores the correction amounts. The image forming section forms, on a sheet of paper, an image corrected on the basis of the correction amounts.