Alignment Sheet with Reference and Background Images for Image Position Correction
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Solution Overview
Problem
Existing image forming apparatuses face misalignment issues between the front and back sides of a sheet due to shrinkage during the developing, transferring, and fixing steps, requiring complex correction processes involving additional assist members.
Innovation Solution
An alignment sheet with reference and background images on both sides, allowing for simultaneous reading by an image reading section after folding, and an image forming apparatus that calculates correction values based on this data to align image forming positions accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a reference chart with reference marks at four corners is used to calculate correction values, then image forming position alignment can be achieved, but an additional assist member is required which complicates the process
Solution Approach 1:
The patent combines the reference chart and assist member into a single integrated alignment sheet. The alignment sheet contains both the reference marks for measurement and the background image that serves as an assist member, eliminating the need for separate components while maintaining alignment accuracy.
Solution Approach 2:
The alignment sheet serves multiple functions simultaneously: it provides reference marks for position measurement, contains a background image to emphasize edges during reading, and acts as the substrate for image formation. This multi-functionality replaces the need for separate reference charts and assist members.
2Measurement precision
If an assist member with different brightness and larger size is placed on the back side of the reference chart, then edge emphasis and precise distance calculation are achieved, but the calculation process becomes complicated
Solution Approach 1:
The background image function is merged into the alignment sheet itself rather than being a separate assist member. The alignment sheet contains both the reference marks and the background image in a single structure, simplifying the overall system while maintaining precise distance calculation capability.
3Reliability
If correction values are calculated using separate reference charts and assist members, then accurate alignment can be achieved, but the number of components and steps increases
Solution Approach 1:
The alignment sheet integrates all necessary components (reference marks, background image, and substrate) into a single element, reducing the number of components from multiple separate parts to one unified structure. This maintains alignment accuracy while improving process efficiency.
Solution Approach 2:
The alignment sheet is pre-prepared with both the reference marks and background image in their correct positions and configurations. This preliminary preparation eliminates the need for separate assembly steps and reduces the complexity of the alignment process.
Data Source
AI summary
An alignment sheet for alignment of an image forming position of a sheet includes a first side and a second side. The first side has a reference image which is formed in a periphery of the first side and which is used for measuring a position of an image on the first side. The second side has a background image with a predetermined area which is formed at a location where the background image does not overlap the reference image. The reference image and the background image are read at the same time by an image reading section while an area with the reference image is folded such that the background image appears as a background.