Perpendicular Coil Assembly for Camera Module Thermal and Force Optimization
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Solution Overview
Problem
Conventional optical image stabilization coils in small form factor cameras face sub-optimal performance due to thermal dissipation issues, force vector alignment, and packaging size constraints when mounted planar to the image sensor.
Innovation Solution
A single piece optical image stabilization actuator coil assembly is mounted perpendicular to the image sensor on multiple faces of the camera actuator module, enhancing thermal dissipation, force vector alignment, and packaging efficiency through side-mounted coils and a monolithic construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If optical image stabilization coils are mounted planar to the image sensor, then the structure is simple and easy to manufacture, but thermal dissipation performance is sub-optimal
Solution Approach 1:
The patent transitions from planar mounting (2D) to perpendicular mounting (3D) by positioning coils on the side faces of the image sensor substrate. This dimensional change enables better thermal pathways to the substrate edge while maintaining manufacturing feasibility through standardized coil fabrication processes.
Solution Approach 2:
The invention divides the coil assembly into separate components (coils, leads, housing) that can be manufactured independently and then assembled. The coils are formed as separate elements rather than integrated directly into the substrate, allowing optimized thermal management while maintaining ease of manufacture through modular assembly.
2Ease of manufacture
If optical image stabilization coils are mounted planar to the image sensor, then manufacturing is straightforward, but force vector alignment to the center of moving mass is sub-optimal
Solution Approach 1:
By moving from planar (2D) to perpendicular (3D) mounting, the force vectors generated by the coils can be more effectively aligned with the center of the moving mass. The perpendicular orientation allows the magnetic force to act more directly on the lens assembly, improving stabilization effectiveness.
Solution Approach 2:
The patent employs asymmetric positioning of coils on different faces of the substrate to optimize force vector alignment. The coil arrangement is deliberately made non-symmetric to match the specific mechanical requirements of the moving mass center, improving force alignment while remaining manufacturable.
3Device complexity
If optical image stabilization coils are mounted planar to the image sensor, then the layout is simple, but packaging size is not optimized
Solution Approach 1:
The transition from planar to perpendicular mounting utilizes the third dimension (vertical height) to accommodate the coil assembly. This allows for more compact packaging by stacking components vertically rather than spreading them out horizontally, reducing the overall footprint while maintaining layout simplicity.
Solution Approach 2:
The coil assembly is nested within a housing structure that integrates with the substrate. The leads are routed through the substrate thickness, and the coils are positioned within the housing cavity, creating a compact nested arrangement that optimizes packaging size while keeping the design relatively simple.
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 improves thermal dissipation, aligns force vectors more effectively, and optimizes packaging size, leading to enhanced performance and efficiency in optical image stabilization for camera modules.
Implementation Method 1
A coil assembly is mechanically coupled to the base of the camera module. The coils include optical image stabilization coils mounted perpendicular to the image sensor on each of a plurality of faces of the camera actuator module
Data Source
AI summary
In some embodiments, an image sensor mechanically coupled to a base of a camera module. A coil assembly is mechanically coupled to the base of the camera module. The coil assembly includes terminals for connections to respective ones of coils through leads routed through thin areas leading to coil housings. The coils include optical image stabilization coils mounted perpendicular to the image sensor on each of a plurality of faces of the camera actuator module.