Optical Scanner Casing Segmentation for Thermal Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Optical scanners in image forming apparatuses face challenges in maintaining high productivity and imaging quality due to excessive heat generation and contamination of deflection mirrors, leading to degradation of optical characteristics when the deflector is operated at high speed within a sealed casing.
Innovation Solution
The optical scanner design includes a casing with a transparent plate and a recessed cover that forms a continuous space isolating the deflector compartment from the optical element mounting portion, preventing hot air and foreign substances from reaching the optical elements, and using shoulder screws with sealing members to absorb thermal expansion differences, while also providing a second cover for enhanced heat dissipation and maintainability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the deflector is sealed within the optical casing to prevent contamination and heat scattering, then the deflection mirrors are protected from dust and hot air is contained, but the temperature of the deflector increases excessively and heat migrates to optical elements
Solution Approach 1:
The optical casing is divided into two separate compartments: a deflector compartment housing the high-speed deflector and an optical element mounting portion housing the optical elements. These compartments are isolated from each other, allowing the deflector to be sealed for contamination protection while preventing heat transfer to optical elements. The segmentation enables independent temperature management in each zone.
Solution Approach 2:
A partition wall with a heat-resistant plate is introduced as an intermediary structure between the deflector compartment and the optical element mounting portion. This partition acts as a thermal barrier that allows optical paths to pass through while blocking heat transfer. The heat-resistant plate specifically prevents thermal conduction from the hot deflector area to the sensitive optical elements.
2Productivity
If the deflector rotates at high speed to achieve high productivity, then the output increases, but the amount of heat generated increases and optical properties deteriorate
Solution Approach 1:
By segmenting the casing into isolated compartments, the heat generated by high-speed deflector rotation is confined to the deflector compartment and prevented from reaching the optical elements. This allows the deflector to rotate at high speeds for increased productivity without causing thermal deterioration of optical properties.
Solution Approach 2:
The heat generated by high-speed rotation, which is normally a harmful byproduct, is redirected into the deflector compartment where it can be managed separately. The partition structure converts the harmful heat scattering effect into a contained thermal environment, allowing high-speed operation while protecting optical elements from thermal damage.
3Reliability
If the deflector compartment is isolated from the optical element mounting portion, then heat and hot air are prevented from reaching optical elements, but the structure becomes more complex
Solution Approach 1:
The casing is segmented into functional compartments using partition walls with integrated heat-resistant plates. This segmentation achieves thermal isolation and protection of optical elements while maintaining a relatively simple overall structure. The partition design combines multiple functions (structural support, thermal barrier, optical path transmission) into a single component, reducing the number of separate parts needed.
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 reduces temperature elevation around the deflector, prevents contamination of mirrors, and maintains high-quality imaging by isolating the deflector compartment from optical elements, thereby ensuring consistent optical performance and extended image quality.
Implementation Method 1
The recessed portion of the first cover and the walls of the deflector compartment are directly or indirectly connected to form a single continuous space isolating the deflector compartment from the optical element mounting portion
Implementation Method 2
shoulder screws with sealing members to absorb thermal expansion differences
Data Source
AI summary
An optical scanner includes a light source, an optical element, a deflector, a casing, and a first cover. The deflector deflects the light beam emitted from the light source to scan a photoreceptor through the optical element. The casing includes an upper opening, walls including a transparent plate defining a deflector compartment to accommodate the deflector, and an optical element mounting portion to accommodate the light source and the optical element. The first cover covers the upper opening of the casing and includes a recessed portion recessed toward the bottom of the casing and including a first opening at the bottom thereof facing the deflector. The recessed portion and the walls are directly or indirectly connected to define a single continuous space isolating the deflector compartment from the optical element mounting portion. The recessed portion and the deflector compartment communicate via the first opening.