Camera Module Coil Fixing via Segmented Grooves
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Solution Overview
Problem
Miniaturized camera modules face challenges in integrating VCM technology due to space constraints, leading to issues with adhesive application and stability, particularly in handheld devices where shocks and vibrations are common, causing the coil to disengage from the outer blade during assembly and potentially contaminating surrounding components.
Innovation Solution
A camera module design featuring a coil fixing unit with fixing protrusions, a coil reception groove, and an adhesive input groove ensures secure adhesion of the coil to the outer blade, preventing disengagement during assembly and minimizing adhesive overflow, using a combination of wire springs and permanent magnets for stabilization and power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the coil is miniaturized to fit the small OIS actuator, then the device size is reduced, but the assembly space for the outer blade and coil becomes insufficient, making it difficult to coat sufficient adhesive and causing the coil to disengage
Solution Approach 1:
The outer blade is divided into multiple functional regions: a coil reception groove for positioning the coil, an adhesive input groove for adhesive application, and fixing protrusions for mechanical retention. This segmentation allows each region to perform its specific function effectively, ensuring reliable coil fixation despite miniaturization
Solution Approach 2:
The coil reception groove and fixing protrusions are pre-formed on the outer blade before coil assembly. This preliminary structuring ensures proper coil positioning and adhesive placement, preventing disengagement during subsequent assembly and operation
2Reliability
If the amount of adhesive is increased to prevent coil disengagement, then the coil fixation is improved, but the adhesive overflows to contaminate the outside of the outer blade and surrounding parts
Solution Approach 1:
The adhesive input groove is designed with specific local geometry (depth, width, and positioning) to confine adhesive exactly where needed. This localized structure ensures sufficient adhesive is applied to the coil-base interface without overflow onto surrounding components
Solution Approach 2:
The adhesive input groove acts as an intermediary structure between the adhesive application process and the final coil fixation. It controls adhesive flow and placement, ensuring proper bonding without contamination
3Reliability
If the coil is securely fixed using traditional methods, then the fixation stability is improved, but the assembly process becomes complex and time-consuming
Solution Approach 1:
Multiple fixation functions (mechanical retention via fixing protrusions, adhesive application via adhesive input groove, and positioning via coil reception groove) are merged into a single integrated outer blade structure. This eliminates the need for separate fixation components and simplifies the assembly process while ensuring reliable coil fixation
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
The design provides a stable and secure attachment of the coil to the outer blade, preventing disengagement and contamination, while allowing for effective handshake compensation and optical image stabilization, enhancing the camera module's durability and performance in miniaturized devices.
Implementation Method 1
a holder module spaced apart from an inner bottom surface of the housing unit at a predetermined distance, wound on a periphery with a first coil and having at least one lens thereinside
Implementation Method 2
a plurality of wire springs connected at one end to the second PCB and connected at the other end to the plate member
Data Source
AI summary
An exemplary embodiment of the present disclosure includes a first PCB Printed Circuit Board mounted with an image sensor, a housing unit arranged on an upper portion of the first PCB, a holder module spaced apart from an inner bottom surface of the housing unit at a predetermined distance, wound on a periphery with a first coil and having at least one lens thereinside, a second PCB mounted on an upper portion of the holder module, a plate member coupled to a bottom surface of the holder module, a plurality of wire springs connected at one end to the second PCB and connected at the other end to the plate member, and a coil fixing unit configured to fixedly position the first coil to a periphery of the holder module.