Optical Deflector Cover with Temperature Detection
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Solution Overview
Problem
Conventional optical scanning devices with polygonal mirrors face challenges in accurately correcting positional deviations caused by temperature-induced deformation, leading to mis-color registration issues in image formation due to inadequate temperature detection and response.
Innovation Solution
An optical deflector system with a cover member and temperature detection unit is introduced, which covers the polygonal mirror and drive motor, allowing for precise internal temperature detection and airflow management to enhance temperature response and accuracy in positional correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the temperature sensor is installed in a space separated from the optical deflector, then the device structure is simplified and easier to manufacture, but the temperature detection precision deteriorates leading to inaccurate positional deviation correction
Solution Approach 1:
The cover member is divided into three separate cover portions (first, second, and third cover portions) that define distinct spaces. The temperature detection unit is specifically placed in the third space, which is in direct thermal communication with the polygonal mirror and drive motor, allowing accurate temperature measurement of the critical components without requiring the sensor to be in direct contact with them.
Solution Approach 2:
The third cover portion acts as an intermediary structure that transmits thermal information from the polygonal mirror and drive motor to the temperature detection unit. The cover portions collectively form a thermal pathway that allows the temperature sensor to indirectly but accurately measure the temperature of the optical components without being in direct contact with them.
2Measurement precision
If the temperature detection unit is placed closer to the polygonal mirror for better temperature detection, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The cover member serves multiple functions simultaneously: it provides structural support for the polygonal mirror and drive motor, creates defined spaces for component placement, establishes thermal communication pathways for temperature detection, and protects the internal components. This multi-functionality eliminates the need for separate temperature sensing structures.
Solution Approach 2:
The temperature detection function is merged with the cover member structure itself. Rather than adding a separate temperature sensing assembly, the cover portions are designed to inherently provide thermal communication between the polygonal mirror assembly and the temperature detection unit, combining structural and sensing functions into a single integrated component.
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 effectively corrects positional deviations in scanning, reducing mis-color registration errors by providing real-time temperature data for timely adjustments, thereby improving the accuracy and reliability of image formation.
Implementation Method 1
The temperature detection unit is configured to detect an internal temperature of the cover member
Implementation Method 2
The polygonal mirror is configured to deflect light irradiating the outer peripheral surface thereof in such a manner as to enable the deflected light to be scanned
Implementation Method 3
positional deviation in scanning applied to the photosensitive drums by the polygonal mirror due to deformation of the housing caused by heat generated from a drive motor
Data Source
AI summary
Disclosed is an optical deflector which includes: a polygonal mirror, a drive motor, a cover member, and a temperature detection unit. The cover member includes: a first cover portion defining a first space in which the polygonal mirror is installed, wherein the first cover portion is formed with a first opening opened in opposed relation to an outer peripheral surface of the polygonal mirror; a second cover portion defining a second space which is communicated with the first space and in which the drive motor is installed, wherein the second cover portion is formed with a second opening opened in opposed relation to a motor body of the drive motor; and a third cover portion defining a third space which is communicated with the second space. The temperature detection unit is mounted to the third cover portion so as to close the third space.