Image Forming Apparatus Code Reading Accuracy
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Solution Overview
Problem
Existing image forming apparatuses, such as inkjet printers, often experience reading errors in one-dimensional and two-dimensional codes due to deviations in the ratio of bar and space widths, which can be exacerbated by conveyance errors during the printing process, leading to reduced reading accuracy.
Innovation Solution
The apparatus includes a controller that determines the conveying distance for the recording medium based on image data, allowing for the adjustment of scanning processing to ensure that the code image is formed over a shorter length in the first scanning pass and a longer length in the second pass, thereby minimizing the impact of conveyance errors and maintaining high reading accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the code image is formed by multiple scanning processing with standard conveying distance, then the code image can be completed across scanning regions, but the reading accuracy decreases due to conveyance errors affecting bar and space width ratios
Solution Approach 1:
The patent applies local quality by making the conveying distance variable rather than uniform. Specifically, the conveying distance is set to be shorter for scanning processing that forms code images (particularly in the conveying direction) and longer for other scanning processing. This localized adjustment ensures that code images are formed with high reading accuracy by minimizing conveyance errors during code image formation, while maintaining efficient overall printing throughput.
2Measurement precision
If the conveying distance is shortened to improve reading accuracy, then the code image formation is more precise, but the printing time increases due to additional conveying processing
Solution Approach 1:
The patent implements dynamics by making the conveying distance adaptive rather than fixed. The conveying distance is dynamically adjusted based on the type of scanning processing being performed: it is set to a shorter distance when forming code images to ensure reading accuracy, and to a longer distance for other scanning processing to maintain efficient printing speed. This dynamic adjustment optimizes both reading accuracy and printing time.
3Ease of manufacture
If multiple scanning processing are used to form the code image, then the code image can be formed by dividing the scanning regions, but the number of conveyance errors increases
Solution Approach 1:
The patent applies local quality by differentiating the conveying distance based on the scanning processing type. For scanning processing that forms code images, a shorter conveying distance is used to minimize conveyance errors and maintain reading accuracy. For other scanning processing, a longer conveying distance is acceptable. This localized optimization reduces the overall number of conveyance errors while maintaining code image formation feasibility.
Data Source
AI summary
An image forming apparatus configured to: decide a conveying distance for a conveying processing based on image data stored in a memory; and shorten, in a case where it is determined that a code image is to be formed by a plurality of scanning processing including a first scanning processing and a second scanning processing, the decided conveying distance for: (i) one conveying processing which is executed immediately before the first scanning processing; or (ii) at least one of a plurality of conveying processing which are respectively executed immediately before each of a plurality of scanning processing which includes the first scanning processing and at least one scanning processing executed before the first scanning processing, so that the code image is not to be formed in the first scanning processing and the code image is started to be formed from the second scanning processing.