Optical Module Magnet Recess Layout for Mirror Inclination Stability
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Solution Overview
Problem
The integration of three magnets in a magnet unit for an optical module leads to positional deviations and step formations, causing deviations in the inclination of the mirror device, which affects the reliability of the optical module.
Innovation Solution
The magnet unit is accommodated in a recess of the package with a specific configuration, where the second magnet's upper surface is closer to the lower side than the first magnet's upper surface, allowing for a larger adhesive area and preventing contact between the magnet unit's bottom surface and the package, thus stabilizing the magnet unit's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If three magnets are integrated through bonding to form a magnet unit, then the magnetic field generation is improved, but the position of the magnet unit deviates in the up-down direction and step portions are formed on the upper and bottom surfaces
Solution Approach 1:
The magnet unit is divided into three separate magnets (first, second, and third magnets) with different magnetic directions. Each magnet is independently positioned and fixed to the magnetostatic shielding plate, avoiding the need to bond multiple magnets together as a single integrated unit. This segmentation eliminates the up-down direction deviation and step portion formation that occur during bonding integration.
2Device complexity
If the magnet unit is fixed directly to the package, then the structure is simplified, but the inclination of the mirror device deviates from the target angle due to step portions on the magnet unit surface
Solution Approach 1:
A magnetostatic shielding plate is introduced as an intermediary component between the package and the three magnets. The plate provides a flat mounting surface for the magnets, preventing step portions from affecting the mirror device inclination. Additionally, the plate serves as magnetic shielding, blocking stray magnetic fields from affecting other components in the optical module.
3Power
If magnets with different magnetic directions are arranged close together, then the magnetic field efficiency is improved, but the magnets repel each other causing positional deviation
Solution Approach 1:
The magnetostatic shielding plate acts as a counterbalancing element that physically supports the three magnets with different magnetic directions. The plate's structural rigidity counteracts the repulsive forces between adjacent magnets, preventing positional deviation while allowing the magnets to be arranged close together for efficient magnetic field generation.
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 enhances the reliability of the optical module by preventing deviations in the mirror device's inclination and ensuring firm fixation, while also mitigating thermal expansion and deformation issues.
Implementation Method 1
a magnet unit having an upper surface, a bottom surface, and a side surface extending from the upper surface to the bottom surface, and generating a magnetic field acting on the movable mirror portion
Implementation Method 2
the magnet unit is fixed to the base wall portion by a first adhesive material disposed at least between the first surface of the base wall portion and the second upper surface of the second magnet
Data Source
AI summary
An optical module includes a mirror unit, a magnet unit, and a package including a recess. The magnet unit includes a first magnet and a second magnet. The recess includes a base wall portion to which an upper surface of the magnet unit is fixed, and a side wall portion facing a side surface of the magnet unit. The mirror unit is disposed on a second surface on an opposite side of the base wall portion from a first surface to which the magnet unit is fixed. A second upper surface of the second magnet is located closer to the lower side than a first upper surface of the first magnet. The magnet unit is fixed to the base wall portion by an adhesive material disposed at least between the first surface of the base wall portion and the second upper surface of the second magnet.