Optical Module Mirror Unit Protrusion for Magnet Adhesion
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Solution Overview
Problem
The integration of magnets in optical modules can lead to positional deviations and reduced adhesive strength due to magnetic repulsion, causing inclination deviations and decreased fixing strength of the mirror device, which affects the reliability of the optical module.
Innovation Solution
An optical module design featuring a mirror unit with a protrusion portion on its bottom surface, fixed to the upper surface of a magnet unit, where the protrusion's width is equal to or less than the magnet's width, to stabilize the mirror unit's position and adhesive strength, even with step formations on the magnet unit's surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple magnets are integrated through bonding to form a magnet unit, then the magnet unit can generate a magnetic field for actuating the mirror device, but the magnets repel each other causing positional deviation and step portions on the upper surface
Solution Approach 1:
A non-magnetic intermediate layer is introduced between adjacent magnets to prevent direct magnetic repulsion. This intermediary layer acts as a buffer that reduces the repulsive force while allowing the magnets to maintain their positioned arrangement, thereby preventing positional deviation and step formation during bonding integration.
Solution Approach 2:
The magnetic properties of the intermediate layer are specifically designed to have low or zero magnetic permeability, changing the magnetic field distribution parameters. This parameter change allows the intermediate layer to block magnetic flux lines, reducing the repulsive interaction between adjacent magnets with opposite polarity.
2Ease of operation
If the mirror device is disposed on the magnet unit with step portions, then the mirror device can be positioned, but the inclination deviates from the target angle and adhesive strength decreases
Solution Approach 1:
The intermediate layer is pre-formed on the upper surface of the magnet unit before the mirror device is disposed. This preliminary action creates a flat, uniform bonding surface that compensates for any step portions, ensuring that the mirror device adheres at the correct inclination angle with maximum adhesive strength.
Solution Approach 2:
The intermediate layer serves as a mediator between the magnet unit and the mirror device, providing a flat bonding surface that eliminates the adverse effects of step portions. This intermediary layer ensures uniform adhesive distribution and maintains the correct inclination angle of the mirror device.
3Device complexity
If magnets are bonded together to form a magnet unit, then the structure is integrated, but the repulsion between magnets causes deviation in inclination and decrease in fixing strength
Solution Approach 1:
The non-magnetic intermediate layer acts as a mediator that reduces magnetic repulsion between adjacent magnets during bonding. By blocking magnetic flux lines, the intermediate layer allows the magnets to be integrated with stronger fixing strength, preventing inclination deviation while maintaining structural integration.
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 design enhances the reliability of the optical module by maintaining the mirror unit's inclination and adhesive strength, reducing the impact of step formations on the magnet unit's surface, and allowing for stable actuation of the movable mirror portion.
Implementation Method 1
a movable mirror portion provided with a coil; and a magnet unit including a first magnet, a second magnet, and a third magnet arranged along a first direction, and generating a magnetic field acting on the movable mirror portion
Data Source
AI summary
An optical module includes: a mirror unit including a mirror device including a movable mirror portion provided with a coil; and a magnet unit including a first magnet, a second magnet, and a third magnet arranged along a first direction, and generating a magnetic field acting on the movable mirror portion. The mirror unit is disposed on the magnet unit in a second direction perpendicular to the first direction, and has a bottom surface facing the magnet unit. A protrusion portion protruding to a magnet unit side is formed on the bottom surface. A width of the protrusion portion in the first direction is equal to or less than a width of the first magnet in the first direction. The mirror unit is fixed to an upper surface of the first magnet at the protrusion portion.