Sensor Calibration for Image Recording Apparatus Positioning
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Solution Overview
Problem
The detection accuracy of sensors in image recording apparatuses deteriorates due to inappropriate positional relationships between sensors and objects, particularly when the type or condition of the recording medium changes, or when foreign matters are present.
Innovation Solution
An image recording apparatus equipped with a sensor, a drive unit to adjust the sensor's position, and a control unit to calibrate the positional relationship based on detection values, ensuring accurate positioning to maintain detection accuracy. This involves adjusting the sensor's position relative to the object, re-calibrating if necessary, and considering the object's thickness or thermal expansion for precise alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor position is fixed without calibration, then the device complexity is reduced, but the detection accuracy deteriorates due to inappropriate positional relationships
Solution Approach 1:
The patent applies preliminary action by performing calibration before actual image recording operations. The control unit executes calibration processes that adjust sensor positions and establish appropriate positional relationships with recording media in advance, ensuring detection accuracy is maintained without requiring complex real-time adjustments during operation.
Solution Approach 2:
The patent implements feedback mechanisms where detection values from sensors are continuously monitored and fed back to the control unit. Based on this feedback, the system automatically adjusts sensor positions and recalibrates as needed, creating a closed-loop control system that maintains detection accuracy without proportionally increasing device complexity.
2Measurement precision
If the sensor position is adjusted frequently for different recording medium types, then the detection accuracy is maintained, but the productivity decreases due to repeated calibration operations
Solution Approach 1:
The patent applies universality by designing a calibration system that can handle multiple types of recording media through a unified calibration process. The control unit executes the same calibration routine regardless of media type, and the sensor positioning mechanism adapts to different media characteristics, reducing the need for separate calibration procedures for each media type.
Solution Approach 2:
The patent utilizes parameter changes by adjusting calibration parameters and sensor positioning based on detected characteristics of different recording media. The system modifies operational parameters during calibration to accommodate various media types without requiring fundamental changes to the calibration process or reducing productivity.
3Measurement precision
If the sensor is positioned closer to the object for better detection, then the detection accuracy improves, but the reliability decreases when foreign matters are present on the recording medium
Solution Approach 1:
The patent applies dynamics by making the sensor position adjustable rather than fixed. The drive unit enables dynamic repositioning of the sensor based on calibration results and detected conditions. This dynamic positioning allows the system to optimize detection accuracy while maintaining reliability by adjusting the sensor-object distance according to specific operating conditions and foreign matter presence.
Data Source
AI summary
An image recording apparatus includes: a sensor configured to detect a state of an object and outputs a detection value; a drive unit configured to be able to move the sensor in a direction in which the sensor approaches the object and in a direction in which the sensor is away from the object; and a control unit configured to execute calibration for setting a positional relationship between the sensor and the object based on the detection value of the sensor while causing the drive unit to change the positional relationship between the sensor and the object.