Laser Scanning Device Bearing Temperature Detection Strategy
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Solution Overview
Problem
In image forming apparatuses, the existing technologies face challenges in effectively detecting and managing abnormal temperatures of the bearing in the laser scanning device, particularly when the motor is driven at high speeds, which can lead to malfunctions and require precise temperature monitoring.
Innovation Solution
The implementation of a detection processing portion that performs abnormal state detection based on atmospheric temperature within a predetermined range from the bearing only when the motor is driven at a first speed higher than a reference speed, and omits detection when driven at a lower second speed, allowing for improved flexibility in temperature sensor placement and utilization for other functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature sensor is placed close to the bearing to accurately detect bearing temperature, then temperature detection precision is improved, but the sensor placement freedom is reduced and interferes with other functions
Solution Approach 1:
The patent uses atmospheric temperature as an intermediary parameter to indirectly monitor bearing temperature. Instead of placing the sensor directly at the bearing, it detects the atmospheric temperature in the vicinity, which serves as a mediator that correlates with bearing temperature without requiring direct contact or close proximity to the bearing component.
Solution Approach 2:
The patent replaces direct mechanical/physical contact measurement (placing sensor on or next to bearing) with an indirect environmental measurement approach. By substituting the direct bearing temperature measurement with atmospheric temperature detection, the system achieves temperature monitoring without the mechanical constraint of sensor placement near the bearing.
2Reliability
If temperature detection is performed at all motor speeds, then abnormal state detection reliability is improved, but system complexity and energy consumption increase
Solution Approach 1:
The patent implements dynamic detection strategy where the temperature monitoring is activated only under specific operating conditions (high-speed motor operation). The detection system dynamically adjusts its behavior based on motor speed, performing atmospheric temperature detection only when the motor operates at high speed, rather than continuously at all speeds.
Solution Approach 2:
The patent changes the operational parameter of the detection system based on motor speed. By monitoring motor speed as a control parameter, the system activates temperature detection only when speed exceeds a threshold, thereby adapting the detection reliability to match the actual thermal risk profile of different operating conditions.
3Measurement precision
If the temperature sensor is placed within a predetermined range from the bearing, then temperature detection accuracy is improved, but the sensor cannot be used for other functions like setting developing bias voltages
Solution Approach 1:
The patent enables the temperature sensor to serve multiple functions by placing it in a location that allows both atmospheric temperature detection and other system functions. The sensor is positioned to detect atmospheric temperature for bearing temperature estimation while also being available for other purposes such as setting developing bias voltages, thereby achieving multi-functionality without sacrificing detection accuracy.
Solution Approach 2:
By using atmospheric temperature as an intermediary measurement, the system decouples the sensor placement requirements from direct bearing proximity. This allows the sensor to be positioned in a location that satisfies both temperature detection needs and other system requirements, such as developing bias voltage setting, without requiring the sensor to be immediately adjacent to the bearing.
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 enhances the freedom in arranging the temperature sensor, enabling its use for additional purposes like setting developing bias voltages while effectively managing abnormal temperatures, thus preventing malfunctions and ensuring continuous print operations.
Implementation Method 1
a bearing (333D) that rotatably supports a rotation shaft (333A) of the motor (333)
Implementation Method 2
performs detection of an abnormal state, based on an atmospheric temperature detected at a position located within a predetermined first range from the bearing (333D)
Data Source
AI summary
A laser scanning device includes a light source, a rotary polytope, a motor, a bearing, and a detection processing portion. The rotary polytope scans light emitted from the light source. The motor rotates the rotary polytope. The bearing rotatably supports a rotation shaft of the motor. The detection processing portion, in a case where the motor is driven at a first speed that is higher than a predetermined reference speed, performs detection of an abnormal state based on an atmospheric temperature detected at a position located within a predetermined first range from the bearing, and in a case where the motor is driven at a second speed that is lower than the reference speed, does not perform the detection of the abnormal state, wherein the abnormal state is a state where the temperature of the bearing has exceeded a predetermined allowable temperature.