Camera Module Lens Alignment via Protrusion Recess Locking
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Solution Overview
Problem
Conventional camera modules suffer from defects in resolution due to movement of the lens module relative to the bobbin caused by external shocks, leading to off-focus issues between the lens barrel assembly and the PCB, which degrades the camera module's quality.
Innovation Solution
A camera module design featuring a locking structure between the lens module and the bobbin, including a bobbin with a through-hole, a lens module accommodated within, and a protrusion and recess system with guide portions to secure the lens module in place, using adhesive infusion and epoxy hardening for stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the lens module is coupled to the lens driving unit using adhesive, then the assembly process is simple, but the lens module moves from the lens driving unit when external force exceeds adhesive force, causing resolution defects
Solution Approach 1:
The coupling structure is segmented into multiple functional parts: a recess in the lens driving unit, a protrusion on the lens module, guide portions for alignment, and adhesive infusion holes. This segmentation allows each component to perform its specific function while working together to achieve both easy assembly and reliable connection.
Solution Approach 2:
The protrusion of the lens module is nested within the recess of the lens driving unit, creating a interlocking structure. The guide portions are nested within corresponding recesses to provide alignment. This nesting approach ensures the lens module remains securely positioned while maintaining assembly simplicity.
2Volume of moving object
If the camera module size is miniaturized to meet market demands, then the device becomes more compact, but alignment between lens module assembly and PCB becomes more critical and difficult to maintain
Solution Approach 1:
The guide portions and recesses are pre-formed during manufacturing to provide built-in alignment guidance. This preliminary action ensures that when the lens module assembly is mounted on the PCB, the components automatically align correctly without requiring high-precision manual positioning, thus maintaining manufacturing precision even in miniaturized designs.
3Productivity
If drooping at both sides of lens barrel assembly is uneven, then assembly is faster, but focuses of lens barrel assembly and PCB are not matched, generating quality problems
Solution Approach 1:
The guide portions and recesses are pre-formed during manufacturing to provide built-in alignment guidance. This preliminary action ensures that when the lens module assembly is mounted on the PCB, the components automatically align correctly without requiring high-precision manual positioning, thus maintaining manufacturing precision even in miniaturized designs.
Solution Approach 2:
The guide portions and recesses create a self-aligning mechanism where the lens module assembly automatically positions itself correctly on the PCB during assembly. This self-service alignment eliminates the need for complex external alignment tools or procedures, maintaining focus alignment while enabling faster assembly.
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 solution effectively minimizes defects in resolution caused by external shocks, ensuring the lens module remains aligned with the PCB, thereby enhancing the camera module's quality and preventing off-focus issues.
Implementation Method 1
the lens module and the bobbin are coupled by an adhesive
Implementation Method 2
using adhesive infusion and epoxy hardening for stability
Data Source
AI summary
The present embodiment relates to a camera module comprising: a bobbin, which has a through-hole formed therein; a lens module, which is accommodated in the through-hole and is coupled to the bobbin; a protrusion formed to protrude from the outer peripheral surface of the lens module; and a recess formed to be recessed from the inner peripheral surface of the bobbin so as to accommodate at least a part of the protrusion, wherein the recess comprises a first guide portion, which extends downwards from the upper end of the bobbin, and a second guide portion, which extends so as to slope from the first guide portion.