Optical Module Magnet Unit Design for Mirror Stability
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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
The optical module design includes a magnet unit with a first magnet wider than the second and third magnets, where the mirror unit is fixed to the upper surface of the first magnet, ensuring stable actuation of the movable mirror portion and enhancing reliability by smoothing the magnetic field intensity distribution and avoiding adhesive issues between the mirror unit and other magnets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple magnets are integrated through bonding to form a magnet unit, then the magnetic field can be generated to act on the movable mirror portion, but the magnets repel each other causing positional deviation and step portions that lead to inclination deviation and reduced adhesive strength of the mirror device
Solution Approach 1:
A non-magnetic intermediate layer is introduced between adjacent magnets with opposite magnetic directions. This intermediate layer acts as a mediator that prevents direct magnetic repulsion between the magnets while allowing each magnet to maintain its magnetic function. The intermediate layer absorbs the repulsive force, enabling stable integration of multiple magnets without positional deviation or inclination issues of the mirror device.
2Power
If magnets with different magnetic directions are arranged along the lateral direction, then the magnetic field intensity can be enhanced to act on the coil, but the magnetic repulsion between magnets causes the magnet unit position to deviate in the up-down direction
Solution Approach 1:
Non-magnetic intermediate layers are placed between adjacent magnets to mediate the magnetic repulsion forces. These intermediate layers prevent the magnets from pushing each other vertically, thereby maintaining the magnet unit's positional accuracy in the up-down direction while preserving the enhanced magnetic field intensity generated by the arrangement of magnets with different magnetic directions.
3Power
If the mirror device is disposed on the upper surface of the magnet unit with step portions, then the magnetic field can act on the movable mirror portion, but the inclination of the mirror device deviates from the target angle and adhesive strength decreases
Solution Approach 1:
The non-magnetic intermediate layer serves as a mediator that eliminates step portions between adjacent magnets by providing a continuous, flush upper surface. This allows the mirror device to be disposed uniformly across the magnet unit without inclination deviations, while the intermediate layer also prevents adhesive from being pushed out, thereby maintaining strong adhesive bonding between the mirror device and the magnet unit.
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 stabilizes the movable mirror portion's actuation and enhances the reliability of the optical module by preventing inclination deviations and adhesive strength decreases, while allowing for smoother magnetic field distribution and reduced foreign matter issues.
Implementation Method 1
a magnet unit including a first magnet, a second magnet, and a third magnet arranged along a first direction, and configured to generate a magnetic field acting on the movable mirror portion
Data Source
AI summary
An optical module includes: a mirror unit; and a magnet unit including first, second, and third magnets arranged along a first direction. The mirror unit is disposed on the magnet unit in a second direction perpendicular to the first direction. A width of the first magnet is equal to or more than widths of the second and third magnets. An upper surface of the first magnet is located on a mirror unit side with respect to upper surfaces of the second and third magnets in the second direction, or is located at the same position as one of the upper surfaces of the second and third magnets and on the mirror unit side with respect to the other of the upper surfaces of the second and third magnets in the second direction. The mirror unit is fixed to at least the upper surface of the first magnet.