Optical Scanning Device Thermal Expansion Control
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Solution Overview
Problem
As the casing of optical scanning devices becomes larger, the amount of color deviation caused by thermal expansion increases, leading to decreased precision in color deviation correction, and using materials with low thermal expansion coefficients is costly.
Innovation Solution
The optical scanning device incorporates optical unit supporting members with a lower thermal expansion coefficient than the casing, allowing these supporting members to independently expand and reducing the impact of casing thermal expansion on optical units, thereby minimizing color deviation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a material having a low thermal expansion coefficient is used for the casing, then color deviation caused by thermal expansion is reduced, but manufacturing costs increase
Solution Approach 1:
The casing structure is divided into two functional parts: the main casing body made of ordinary material and the optical unit supporting members made of low thermal expansion material. This segmentation allows each part to perform its specific function - the main casing provides structural support while the specialized supporting members compensate for thermal expansion, reducing color deviation without requiring the entire casing to be made of expensive material
Solution Approach 2:
Instead of making the entire casing from low thermal expansion material, only the critical optical unit supporting members are made from this material. This local application of specialized material properties targets the specific area where thermal expansion control is most important, thereby reducing color deviation while minimizing the increase in manufacturing costs
2Volume of stationary object
If the casing size is increased, then the optical scanning device can accommodate more components, but color deviation caused by thermal expansion increases
Solution Approach 1:
The thermal expansion parameter is controlled by changing the material property of the optical unit supporting members to have a lower thermal expansion coefficient than the main casing. This parameter change in material selection allows the supporting members to maintain stable optical unit positions even when the larger casing expands thermally, thereby reducing color deviation despite the increased casing volume
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 effectively reduces color deviation caused by thermal expansion, even with high thermal expansion coefficient materials, enhancing the precision of color correction and maintaining image quality without increasing manufacturing costs.
Implementation Method 1
a thermal expansion coefficient of the optical unit supporting members is lower than a thermal expansion coefficient of the casing
Data Source
AI summary
An optical scanning device provided with a casing, a plurality of light sources, a deflection scanning unit that deflects and scans light beams from the plurality of light sources onto a plurality of bodies to be scanned, and a plurality of optical units arranged between the deflection scanning unit and the bodies to be scanned, in which optical unit supporting members that support the optical units are provided, the optical unit supporting members support the plurality of optical units arranged at predetermined intervals, and a thermal expansion coefficient of the optical unit supporting members is lower than a thermal expansion coefficient of the casing.