Grooved Base Plate for MEMS Magnet Retention
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Solution Overview
Problem
In micro-electromechanical system (MEMS) devices, the use of adhesives to retain magnets can cause movement and disruption of the magnetic field due to minor displacements, affecting the operation of the devices, especially in the small and precise magnetic circuit assemblies.
Innovation Solution
The implementation of a base plate with a plurality of grooves to retain magnets, using fast curing adhesives such as UV or dual curing adhesives, which minimizes the movement of magnets and maintains the magnetic field integrity by allowing precise attachment without disrupting the magnetic force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesives are used to retain magnets to a base plate, then the magnets can be attached to the base plate, but the magnets may move from their original location causing disruption to the magnetic field
Solution Approach 1:
The base plate is prepared with pre-formed grooves at the exact desired magnet locations before magnet attachment. These grooves serve as precise guides and retention features, ensuring magnets are placed and remain at the correct positions. The grooves are strategically designed to engage with the magnet geometry, preventing movement while allowing for precise initial placement.
Solution Approach 2:
The adhesive is applied specifically within the grooves rather than broadly across the entire base plate surface. The grooves act as intermediaries that confine and control the adhesive, ensuring it bonds the magnet to the base plate at precise locations without causing displacement. This localized adhesive application within the groove structure maintains both attachment strength and placement precision.
2Productivity
If fast curing adhesives are used, then the curing time is reduced improving manufacturing throughput, but the adhesive may not set quickly enough to prevent magnet movement
Solution Approach 1:
The grooves are pre-formed in the base plate before magnet attachment, creating ready-made retention features that immediately constrain the magnets upon placement. This preliminary structural preparation ensures that even with fast-curing adhesives, the magnets are physically prevented from moving during the brief uncured state, while still allowing rapid curing to maintain high productivity.
Solution Approach 2:
The adhesive is applied locally within the grooves rather than broadly, concentrating the bonding action where it is most needed. The grooves provide localized confinement that ensures reliable magnet retention during the curing process, while the fast-curing adhesive quickly sets to maintain high manufacturing throughput. The local quality of the groove structure complements the fast-curing adhesive to resolve the contradiction.
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 enhances the manufacturing throughput and reliability of magnet attachment in MEMS devices, ensuring stable magnetic field operation by reducing potential magnet displacement and maintaining the magnetic field's integrity.
Implementation Method 1
The adhesive may thus be a fast curing adhesive that minimizes the possibility of the magnets moving out of their initial placement on the base plate. For example, UV curing adhesives or dual curing adhesives may be used.
Implementation Method 2
These permanent magnets are typically disposed around the MEMS device
Implementation Method 3
Most magnetic actuators are based on electromagnetic force, which acts on a conductor with current running across a magnetic field.
Data Source
AI summary
An example apparatus for produce magnetic fields includes a base plate comprising a plurality of grooves. The apparatus includes an MEMS device disposed on the base plate. The apparatus further includes a number of magnets to produce one or more magnetic fields disposed on the plurality of grooves and adjacent to the MEMS device.