Camera Module Protrusion-Recess Alignment for Sensor Coupling
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Solution Overview
Problem
The challenge lies in securing a strong coupling force and alignment between a circuit board and a sensor base in camera modules, while preventing optical issues such as blinding and overlapping due to the absence of support parts, which can lead to sensor base displacement and damage during tests.
Innovation Solution
A camera module design featuring protrusions on the circuit board and concave portions on the sensor base, with a closed-loop adhesive member surrounding the protrusions, ensuring secure attachment and alignment, and using solder balls to enhance coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the sensor base does not include support parts and is attached using adhesive only, then the structure is simplified, but the sensor base shifts during adhesive curing causing optical problems
Solution Approach 1:
The attachment system is segmented into multiple functional elements: adhesive member for bonding, protrusions for positioning, and recesses for alignment. This segmentation allows each element to perform its specific function independently, resolving the contradiction between structural simplicity and alignment precision.
Solution Approach 2:
Protrusions are pre-formed on the adhesive member at specific positions before attachment. These protrusions preliminarily establish the correct alignment between the sensor base and circuit board, ensuring precise positioning before the adhesive fully cures, thus preventing shift during the bonding process.
2Manufacturing precision
If a pressing jig is used to prevent sensor base shift, then alignment is improved, but the filter is damaged during reliability tests due to height management issues
Solution Approach 1:
The protrusions and recesses are designed to establish correct alignment and height positioning before the adhesive cures. This preliminary positioning action eliminates the need for pressing jigs during attachment, preventing filter damage during subsequent reliability tests while maintaining alignment precision.
Solution Approach 2:
The protrusions act as intermediary elements between the adhesive member and sensor base, providing mechanical positioning and height control. This intermediary structure replaces the function of pressing jigs, ensuring proper alignment without requiring external pressing tools that could damage the filter during testing.
3Device complexity
If the sensor base is pressed on the adhesive member without support parts, then the structure is simplified, but the sensor base separates from the circuit board as the adhesive is not cured
Solution Approach 1:
The attachment system is divided into adhesive bonding (for strength) and mechanical interlocking via protrusions-recesses (for positioning and initial support). This segmentation allows the adhesive to provide bonding strength while the protrusions prevent separation during curing, resolving the contradiction between structural simplicity and coupling force.
Solution Approach 2:
The attachment mechanism combines chemical bonding (adhesive) with mechanical interlocking (protrusions fitting into recesses). This composite approach provides both strong coupling force from the adhesive and immediate mechanical support from the interlocking structures, preventing separation during the curing process while maintaining structural simplicity.
Data Source
AI summary
A camera module according to an embodiment includes a circuit board; a protrusion disposed on the circuit board; an adhesive member disposed on the circuit board and including an opening vertically overlapping the protrusion; and a sensor base disposed on the adhesive member and including a concave portion vertically overlapping the protrusion, wherein the protrusion is inserted into the concave portion of the sensor base, and wherein the adhesive member has a closed loop shape surrounding an edge region of an upper surface of the circuit board.