Spectrometry Device Distance Correction for Printer Colorimetry
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Solution Overview
Problem
Existing image forming apparatuses face challenges in maintaining high accuracy colorimetry due to changes in the distance between the colorimetric sensor and the medium, leading to variations in light intensity distribution and measurement accuracy.
Innovation Solution
A spectrometry device incorporating a spectroscope and a distance measurer that uses a single light source for both spectrometry and distance measurement, correcting measured values based on the measured distance to maintain accurate colorimetry even with changes in the distance between the measurement target and the spectroscope.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the distance between the colorimetric sensor and the medium is changed, then the measurement position or irradiation position is changed, but the light intensity distribution at the measurement position is changed, leading to decreased measurement accuracy
Solution Approach 1:
The patent combines the light source for spectrometry and the light source for distance measurement into a single integrated light source. This merging eliminates the need for separate distance measurement tools while enabling both spectrometry and distance measurement functions within one device, thereby maintaining measurement accuracy without significantly increasing device complexity
Solution Approach 2:
The single light source serves multiple functions: it provides illumination for spectrometry and simultaneously enables distance measurement through reflection detection. This multi-functionality allows the device to perform both colorimetry and distance measurement tasks without requiring separate dedicated components for each function
2Measurement precision
If separate distance measurement tools are used, then distance can be measured, but the device complexity increases
Solution Approach 1:
The patent merges the distance measurement function into the existing spectrometry device by utilizing the same light source and detector system. The detector measures both the reflected light for spectrometry and the intensity/phase changes that indicate distance, thereby eliminating the need for separate distance measurement tools
Solution Approach 2:
The detection system is designed to perform multiple functions: it detects reflected light for colorimetry while simultaneously detecting distance information through analysis of light intensity, phase, or time-of-flight characteristics. This universal detection capability reduces the total number of components required
3Productivity
If high-speed spectrometry is performed without distance correction, then productivity increases, but measurement accuracy decreases
Solution Approach 1:
The patent performs distance measurement and correction calculations in advance or simultaneously with the spectrometry process. By having the distance correction mechanism ready and integrated, the system can quickly adjust measurements without requiring separate post-processing steps, thereby maintaining both high speed and high accuracy
Solution Approach 2:
The system implements a feedback mechanism where the measured distance is used to correct the spectrometry measurements in real-time. The detected distance information feeds back to adjust the colorimetry readings, ensuring accurate measurements even when distance variations occur during high-speed operation
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 ensures high accuracy colorimetry by accurately measuring and correcting for distance changes, improving measurement precision and allowing for high-speed spectrometry without the need for separate distance measurement tools, thus enhancing the overall color measurement process.
Implementation Method 1
a light source that emits illumination light to the measurement target, and the light reflected by the measurement target is incident on the spectroscopy element
Implementation Method 2
The distance measurer measures the distance by receiving second light resulting from reflection of the illumination light emitted from the light source of the spectroscope by the measurement target
Data Source
AI summary
A printer that incorporates a spectrometry device includes a spectroscope, a distance measurer, and a spectrometry unit. The spectroscope includes a wavelength-selective interference filter on which light from a position of measurement in a medium is incident. The distance measurer measures the distance between the position of measurement and the spectroscope, and the spectrometry unit performs spectrometry at the position of measurement by using the spectroscope and correct a measured value obtained by the spectrometry based on the measured distance.