Optical System Warpage Suppression via Sliding Reference Surface
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Solution Overview
Problem
The optical system in exposure devices used in image formation apparatuses experiences warpage due to differences in linear expansion coefficients between the lens array and the holding member, especially with temperature changes.
Innovation Solution
Incorporating a holding member with a reference surface and a board that sandwiches the optical system, allowing it to slide parallel to the reference surface, thereby accommodating differences in expansion coefficients and preventing warpage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the optical system is fixed rigidly to the holding member, then the structure is simple and stable, but warpage occurs due to differential thermal expansion
Solution Approach 1:
The optical system is designed to slide along the light shielding plate in the sliding direction while maintaining contact with the reference surface. This dynamic capability allows the optical system to accommodate differential thermal expansion between the lens array and holding member without generating warpage, resolving the contradiction between structural stability and manufacturing precision.
Solution Approach 2:
The invention introduces a sliding mechanism that changes the positional parameter of the optical system relative to the holding member. By allowing movement along the light shielding plate, the system can adjust to thermal expansion differences while maintaining optical contact, thereby preventing warpage while preserving structural integrity.
2Manufacturing precision
If the optical system is made slidable to accommodate thermal expansion, then warpage is suppressed, but the device complexity increases
Solution Approach 1:
The light shielding plate provides localized sliding support only where needed - along its surface in the sliding direction - while maintaining rigid fixation at the board connection points. This localized quality approach allows the optical system to move where thermal expansion occurs without complicating the entire holding structure, thus suppressing warpage with minimal added complexity.
Solution Approach 2:
The light shielding plate acts as an intermediary between the holding member and the optical system. It provides the sliding surface that accommodates thermal expansion while the board provides fixed connection points. This intermediary structure enables differential movement without requiring complex adjustment mechanisms, resolving the contradiction between precision and complexity.
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 suppresses warpage and prevents breakage of bonded sections due to temperature changes, ensuring stable operation and reduced manufacturing costs.
Implementation Method 1
the linear expansion coefficient of the lens array is different from that of the holding member. Therefore, the optical system (the stacked body) may cause warpage due to a change in temperature
Data Source
AI summary
An exposure device according to an embodiment may include: a holding member provided with a reference surface; an optical system being in contact with the reference surface and slidable in a first direction parallel to the reference surface; and a board including a light emitting element and being fixed to the holding member such that the optical system is sandwiched between the reference surface and the board.