Colorimetric Unit Positioning for Dust-Resistant Image Reading
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Image reading apparatuses are affected by paper dust during sheet conveyance, which impacts the detection accuracy of colorimetric units due to their limited detection range and higher sensitivity compared to image reading units.
Innovation Solution
The apparatus includes a configuration with multiple conveyance members and a colorimetric unit positioned outside the area between these members, where the colorimetric unit faces the sheet from above and is kept away from heat sources and areas with varying sheet temperatures, ensuring consistent sheet speed and minimizing paper dust exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a colorimetric unit is arranged within the sheet conveying area to measure color information, then color measurement accuracy is improved, but paper dust attracts to the optical system and greatly influences detection accuracy
Solution Approach 1:
The colorimetric unit is extracted from the sheet conveying area and arranged in a position outside the area from the sheet conveying area, separating the measurement function from the dust-generating conveyance zone while maintaining measurement capability through optical path design
2Reliability
If a colorimetric unit with limited detection range is used, then color information is measured with higher reliability, but paper dust has a great influence on detection accuracy due to spot measurement within limited view angle
Solution Approach 1:
A sheet conveying area is introduced as an intermediary zone between the sheet feed and colorimetric measurement positions, allowing sheets to be conveyed through a dust-free path before reaching the colorimetric unit, thereby protecting the optical system from paper dust while maintaining reliable spot measurement
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration reduces the impact of paper dust on colorimetric measurements, maintaining high accuracy and stability by isolating the colorimetric unit from dust generation areas and temperature variations, thus enhancing the reliability of color information feedback to the image forming system.
Implementation Method 1
a colorimetric unit arranged outside an area from the first conveyance member to the second conveyance member and structured to colorimetric measure the sheet which is conveyed
Data Source
AI summary
An image reading apparatus and an image forming system which are hardly affected by noise due to paper dust or the like is provided. An image reading apparatus includes a back side image reading unit and a front side image reading unit which are continuously arranged in a sheet conveying direction. Also, an upstream side conveyance member and an intermediate conveyance member are arranged adjacent to each other in the upstream and downstream sides of the back side image reading unit. The intermediate conveyance member and the downstream side conveyance member are arranged adjacent to each other in the upstream and downstream sides of the front side image reading unit. The colorimetric unit is arranged outside an area from the upstream side conveyance member to the downstream side conveyance member in the sheet conveying direction.