Reading Device Light Intensity Control for Color Mixture Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Image reading devices face challenges in preventing color mixture when simultaneously irradiating documents with visible light and near-infrared light, as unwanted light from different sources can be detected, leading to superimposed images and reduced image quality.
Innovation Solution
The device employs a configuration with two light sources of different wavelengths, a first light source emitting invisible light and a second light source emitting visible light, along with dedicated image sensors and light-intensity adjusters to set optimal intensity values based on output data from each sensor, preventing color mixture by adjusting the intensity of each light source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple light sources of different wavelengths are simultaneously turned on to read images, then reading efficiency is improved, but color mixture occurs and image quality deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-calculating the degree of color mixture for each sensor with respect to each light source before simultaneous illumination. These pre-calculated values are stored and used during actual operation to determine appropriate light intensity values that prevent color mixture, thereby enabling simultaneous multi-wavelength illumination without image quality degradation
Solution Approach 2:
The patent changes the parameter of light intensity by dynamically adjusting the intensity of each light source based on pre-calculated color mixture degrees. By varying the light intensity parameters according to sensor sensitivity characteristics, the system prevents color mixture while maintaining simultaneous illumination for efficient reading
2Measurement precision
If light intensity is increased to improve signal strength, then signal-to-noise ratio is improved, but color mixture from multiple light sources increases
Solution Approach 1:
The patent optimizes the light intensity parameter by calculating appropriate intensity values that achieve sufficient signal strength for good signal-to-noise ratio while preventing excessive color mixture. The system adjusts light intensity parameters based on pre-calculated color mixture degrees and sensor characteristics
Solution Approach 2:
The patent uses feedback by utilizing output data from image sensors to refine light intensity settings. The system monitors sensor responses and adjusts light intensity accordingly to maintain optimal signal-to-noise ratio while preventing color mixture
3Manufacturing precision
If separate scanning operations are used for different wavelengths to prevent color mixture, then image quality is maintained, but reading time increases
Solution Approach 1:
The patent performs preliminary calculation of color mixture degrees and stores these values for rapid retrieval during simultaneous multi-wavelength reading operations, eliminating the need for sequential scanning while maintaining image quality
Solution Approach 2:
The patent implements periodic action by using pre-calculated color mixture data that can be applied repeatedly across multiple simultaneous reading operations, enabling continuous high-speed reading without quality degradation
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 approach effectively prevents color mixture, enhancing image quality by ensuring that each light source's intensity is optimized, thereby improving the signal-to-noise ratio and reducing noise in the output images.
Implementation Method 1
a first image sensor configured to receive the light that is emitted from the first light source and is reflected by an object
Implementation Method 2
a second image sensor configured to receive the light that is emitted from the first light source and the second light source and is reflected by the object
Data Source
AI summary
A reading device includes a first light source configured to emit light, a second light source configured to emit light in a wavelength of light different from a wavelength of light of the first light source, circuitry configured to instruct the first light source and the second light source to turn on and turn off, a first light-intensity adjuster configured to adjust light intensity of the first light source based on a first light intensity value, a second light-intensity adjuster configured to adjust light intensity of the second light source based on a second light intensity value, a first image sensor configured to receive the light that is emitted from the first light source and is reflected by an object, and a second image sensor configured to receive the light that is emitted from the first light source and the second light source and is reflected by the object.