Camera Module Base-Cover Integration for VCM Miniaturization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional camera modules for mobile devices face challenges in miniaturization and light-weighting due to the size limitations of Voice Coil Motor (VCM) assemblies, which restrict further reduction in size while maintaining functionality.
Innovation Solution
The camera module design modifies the structural relationship between the actuator and base by incorporating a base with a lower plate and pillar, elastic spring plates, and a cover with pillar portions, allowing for a compact and lightweight configuration that maintains the functionality of the VCM actuator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the size of the camera module is reduced, then miniaturization is achieved, but the VCM assembly size cannot be reduced further without compromising functionality
Solution Approach 1:
The cover and base are merged into a coupled structure where the cover's upper pillar portion fits with the base's lower pillar portion, creating an integrated assembly that reduces overall size while maintaining VCM functionality. The yoke is pinched between the base and cover, further integrating components.
Solution Approach 2:
The VCM assembly is nested within the coupled base-cover structure, with the bobbin elastically supported by spring plates inside the base, and the cover enclosing the upper portion. This nested arrangement maximizes space utilization and minimizes the overall camera module volume.
2Weight of moving object
If the camera module is made lightweight, then light-weighting is achieved, but structural strength may be compromised
Solution Approach 1:
The cover and base are designed as thin-walled structures with pillar portions that provide structural strength through geometric design rather than material thickness. The elastic spring plates use flexible material properties to provide support while minimizing weight.
Solution Approach 2:
The coupled base-cover structure combines different materials with complementary properties - the base provides rigid support for the VCM assembly, while the cover encloses and protects components. The elastic spring plates use materials with appropriate flexibility and strength characteristics.
3Volume of moving object
If the cover and base are structurally changed to enable miniaturization, then compactness is achieved, but the coupled relationship between actuator and base must be maintained
Solution Approach 1:
The pillar portions of the cover and base are positioned asymmetrically at corner portions rather than centrally, creating an offset coupled relationship that enables compact arrangement of the VCM assembly while maintaining stable mechanical connection between the actuator and base.
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 achieves miniaturization and light-weighting of the camera module while maintaining structural strength and functionality, enabling a smaller form factor without compromising performance.
Implementation Method 1
a lower spring plate arranged at an upper surface of the lower plate portion of the base and formed with an elastic support portion; a bobbin elastically supported by the elastic support portion of the lower spring plate; an upper spring plate having an elastic support portion coupled to an upper surface of the lens actuator to elastically support the bobbin
Implementation Method 2
an actuator for automatic focus adjustment generally using a VCM (Voice Coil Motor) method; a lens actuator including a bobbin elastically supported by the elastic support portion of the lower spring plate and accommodated inside with a lens assembly, and a yoke wrapping a periphery of the bobbin
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The present invention relates to a camera module, the module including: a PCB; an image sensor mounted on the PCB and formed with an image pickup device; a base mounted on the PCB and including a plated portion formed at a lower center with an opening mounted with an IR filter; a lower spring plate formed with a conductive material; a spacer arranged on an upper surface of the lower spring plate and forming a staircase structure by a rib wrapping a periphery of the lower spring plate to supportively apply a pressure to the lower spring plate; a lens actuator including a bobbin, and a yoke; an upper spring plate coupled to an upper surface of the lens actuator; and a cover arranged on an upper surface of the upper spring plate.