Voice Coil Motor Base Laser Direct Structuring
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Solution Overview
Problem
Thinner voice coil motor bases with reduced adhesion to the housing increase the risk of separation during use, compromising the structural integrity and electromagnetic shielding effectiveness.
Innovation Solution
The voice coil motor design incorporates a base made of laser direct structuring material with a metal layer formed by Laser Direct Structuring processes, which is laser welded or solder paste spot welded to the housing, enhancing the connection strength without increasing thickness, and using glue to fill gaps for additional fastening and dust prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the base thickness is reduced to enable miniaturization, then the voice coil motor becomes thinner, but the base strength and adhesion to housing decrease, increasing separation risk
Solution Approach 1:
The base is constructed as a composite structure with a plastic substrate and a metal layer (such as copper or aluminum) formed on its surface. This composite design provides both the thin profile needed for miniaturization and the enhanced mechanical strength and adhesion properties of metal, resolving the contradiction between reduced thickness and maintained strength.
Solution Approach 2:
The invention changes the material parameters of the base by incorporating a metal layer with specific physical properties (high strength, good adhesion) on the plastic base. This parameter modification allows the base to maintain sufficient strength and bonding capability even when the overall thickness is reduced, enabling miniaturization without sacrificing structural integrity.
2Length of moving object
If the base thickness is reduced to enable miniaturization, then the voice coil motor becomes thinner, but the adhesion between base and housing decreases, increasing separation risk
Solution Approach 1:
The metal layer on the base serves dual functions: it strengthens the base structure and provides superior adhesion to the housing compared to plain plastic. This composite material approach ensures reliable bonding between base and housing even when the base thickness is reduced, maintaining reliability during miniaturization.
Solution Approach 2:
By modifying the material composition of the base to include a metal layer, the adhesion parameters between base and housing are significantly improved. The metal surface offers better bonding characteristics, ensuring reliable connection even with reduced base thickness, thus preventing separation during use.
3Strength
If welding or spot welding is used to connect base to housing, then connection strength is improved, but the process complexity increases
Solution Approach 1:
The invention replaces traditional mechanical fastening methods (such as screws or clips) with direct welding or spot welding of the metal layer to the housing. This substitution provides superior connection strength while actually simplifying the manufacturing process by eliminating the need for separate fastening components and assembly steps, despite introducing thermal processing.
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 improves the connection strength between the base and housing, preventing separation and maintaining electromagnetic shielding while enabling miniaturization of the voice coil motor, thus enhancing its reliability and performance in electronic devices.
Implementation Method 1
a base made of laser direct structuring material with a metal layer formed by Laser Direct Structuring processes
Implementation Method 2
laser welded or solder paste spot welded to the housing
Implementation Method 3
laser welded or solder paste spot welded to the housing
Data Source
AI summary
A voice coil motor includes a housing, a cover plate, an upper elastic member; a movable assembly, an immovable assembly, a lower elastic member, and a base cooperating with the housing to receive the cover plate, the upper elastic member, the movable assembly, the immovable assembly, and the lower elastic member. The base is made of laser direct structuring material. A metal layer is formed on a region of the base connecting the housing by Laser Direct Structuring processes, and the metal layer is fixed on the housing by laser welding or solder paste spot welding. The disclosure also provides an electronic device having the voice coil motor.