Camera Module Lens Driving Device Coupling Reinforcement
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Solution Overview
Problem
Camera modules in small electronic devices, such as smartphones, face issues with the lens driving device separating from the circuit board due to external forces, leading to degraded image quality and resolution.
Innovation Solution
The camera module incorporates a coupling reinforcement portion to securely attach the lens driving device to the circuit board, preventing separation even under repeated external forces, and includes a reinforcement structure to protect the flexible circuit board from deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the lens driving device is coupled to the circuit board using conventional methods, then the assembly is simple to manufacture, but the coupling strength is insufficient and separation occurs under external forces
Solution Approach 1:
The coupling reinforcement portion is divided into multiple engagement structures that interact with corresponding features on the lens driving device and circuit board. This segmentation distributes the mechanical stress across multiple points rather than relying on a single coupling point, thereby increasing overall coupling strength while maintaining manufacturing simplicity.
Solution Approach 2:
The coupling reinforcement portion utilizes composite structural design combining rigid and flexible elements. The rigid portions provide structural support and strong mechanical coupling, while flexible portions accommodate thermal expansion and manufacturing tolerances, achieving high coupling strength without excessive complexity.
2Ease of manufacture
If the flexible circuit board is made deformable to accommodate assembly variations, then the ease of assembly is improved, but cracks and damages occur in circuit patterns under repeated deformation
Solution Approach 1:
The coupling reinforcement portion is designed to provide mechanical support and constraint to the flexible circuit board before deformation occurs. This pre-support structure acts as a cushion that limits the amplitude and stress of repeated deformations, preventing crack initiation and propagation in the circuit patterns while still allowing sufficient flexibility for assembly.
Solution Approach 2:
The flexible circuit board is designed with non-uniform properties: regions requiring flexibility maintain deformability for assembly, while regions near the coupling reinforcement portion have enhanced structural support to prevent cracking. This local differentiation of mechanical properties allows the board to be both easy to assemble and reliable under repeated deformation.
3Reliability
If the lens driving device is strongly coupled to the circuit board, then the reliability of auto-focusing function is improved, but the manufacturing complexity increases
Solution Approach 1:
The coupling reinforcement portion integrates multiple functions into a single component: mechanical coupling, electrical connection support, and structural reinforcement. By merging these functions, the design achieves high reliability of coupling without proportionally increasing manufacturing complexity, as the reinforcement portion can be manufactured as an integrated part rather than separate components.
Data Source
AI summary
A camera module of an embodiment may comprise: a first holder in which a filter is mounted; a lens barrel that is provided to be vertically movable in a first direction with respect to the first holder; a lens operating device that comprises a terminal and moves the lens barrel in the first direction; a first circuit board that is disposed under the first holder and on which an image sensor is mounted; a soldering portion for electrically connecting the terminal of the lens operating device to the first circuit board; and a coupling reinforcement portion that is disposed to face the soldering portion and couples the lens operating device and the first circuit board.