Image Reading Device Light Source Control for Power and Accuracy
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Solution Overview
Problem
Existing image reading devices face challenges in efficiently controlling the light source turn-on conditions, leading to power wastage and reduced detection accuracy due to inconsistent illumination, especially when switching between operation modes for improving printing position accuracy and color reproducibility and stability.
Innovation Solution
An image reading device with a control unit that adjusts the light source turn-on conditions based on position information of image patterns, allowing for power-saving modes and high-quality, stable reading operations by selectively turning on the light source only during necessary periods and maintaining constant illumination when required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the light source is turned on continuously to maintain stable surface illuminance for high detection accuracy, then measurement precision is improved, but use of energy increases and light source deterioration accelerates
Solution Approach 1:
The patent applies dynamics by making the light source turn-on condition variable based on the operation mode. In the first operation mode (position accuracy improvement), the light source is turned on only during necessary periods when image patterns are being read. In the second operation mode (color reproducibility improvement), the light source is turned on continuously to maintain stable surface illuminance. This dynamic adjustment of the light source control based on operational requirements resolves the contradiction between energy consumption and measurement precision.
Solution Approach 2:
The patent changes the parameter of light source turn-on condition from a fixed state to a variable state that depends on the selected operation mode. By changing this parameter, the system can optimize between power consumption and detection accuracy according to the specific reading task being performed, thus resolving the technical contradiction.
2Use of energy by moving object
If the light source is turned off during periods when image reading is not necessary to reduce power consumption, then use of energy is improved, but measurement precision deteriorates due to unstable surface illuminance
Solution Approach 1:
The system dynamically adjusts the light source control strategy based on the operation mode selected. For color reproducibility improvement tasks, the light source remains continuously on to ensure stable surface illuminance, while for position accuracy tasks, the light source is turned off during non-reading periods. This dynamic control resolves the contradiction between energy saving and measurement precision.
3Use of energy by moving object
If the light source turn-on condition is adjusted dynamically based on operation mode to reduce power consumption, then use of energy is improved, but device complexity increases
Solution Approach 1:
The patent introduces dynamic control of the light source based on operation mode selection. The control unit adjusts the turn-on condition of the light source according to whether the first or second operation mode is selected, enabling energy optimization while maintaining detection accuracy through mode-appropriate illumination strategies.
Solution Approach 2:
The light source control system is designed to serve multiple functions by adapting its behavior to different operation modes. The same light source and control unit handle both position accuracy improvement tasks (with selective turn-on) and color reproducibility improvement tasks (with continuous on), making the system multi-functional and reducing the need for separate control mechanisms.
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 solution enables comprehensive improvement in image reading device performance and printed image quality by optimizing light source usage and maintaining stable illumination, thus addressing the limitations of previous technologies.
Implementation Method 1
a light source (11a), configured to irradiate a subject (P) with light
Implementation Method 2
detect reflected light generated by the subject (P) reflecting light emitted from the light source (11a)
Data Source
AI summary
An image reading device includes a light source configured to irradiate a subject; a reading unit configured to detect reflected light generated by a subject reflecting light emitted from the light source, to perform reading; and a control unit configured to perform turn-on control on the light source. The control unit is configured to perform the turn-on control to change a turn-on condition such that the light source is turned on during a period when at least a detection region including an image pattern on the subject passes through a reading position of a reading unit, based on position information of the image pattern of the subject in a first operation mode for reading the subject, and perform the turn-on control to make the turn-on condition of the light source constant regardless of the image pattern of the subject in a second operation mode for reading the subject.