Camera Module Assembly with Chamfered Adhesive Bonding
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Solution Overview
Problem
Camera modules face image quality degradation due to lens tilt relative to the sensor, which existing assembly methods using curable adhesives often fail to correct without affecting the focus state.
Innovation Solution
A method involving the use of chamfers on the lens holder and lens assembly, where curable adhesive is applied to these chamfers to allow for tilt adjustment until alignment is achieved, then cured to maintain focus while eliminating tilt, using a controlled application process to balance adhesive force and binding power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If curable adhesive is applied between the lens holder and substrate to adjust and fix lens alignment, then lens tilt can be corrected and alignment with sensor is improved, but the focus state of the camera module changes due to altered distance between lens and sensor
Solution Approach 1:
The patent applies curable adhesive to chamfers on the lens holder and lens assembly before final assembly and curing. This preliminary application allows the adhesive to be positioned precisely on the chamfer surfaces, enabling subsequent tilt adjustment without the adhesive interfering with the focus distance. The adhesive is prepared in advance but not yet cured, allowing for alignment adjustments before final bonding.
Solution Approach 2:
The patent divides the bonding interface into specific chamfer surfaces on the lens holder and lens assembly, rather than applying adhesive over the entire contact area. This segmentation concentrates the adhesive application to controlled surfaces that facilitate tilt adjustment while maintaining the optical path and focus distance between the lens and sensor.
2Manufacturing precision
If lens tilt is adjusted after adhesive application to align lens with sensor, then image quality is improved, but the adhesive may not properly bond the components
Solution Approach 1:
The curable adhesive is applied to the chamfers before the lens assembly is fixed in its final position. This preliminary application allows the adhesive to be properly positioned on the bonding surfaces while still allowing for tilt adjustment. After alignment is achieved, the adhesive is cured to create a strong bond that maintains both the alignment and structural integrity.
Solution Approach 2:
The patent utilizes the changeable state of the curable adhesive (from liquid/applied state to cured state) to enable adjustment followed by secure bonding. The adhesive starts in a flexible, adjustable state that allows tilt correction, then transitions to a rigid, strong-bonding state after curing, simultaneously achieving both alignment and bonding strength.
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 method ensures precise alignment of the lens with the sensor, maintaining image quality and focus state by allowing for controlled tilt adjustment and adhesive curing, thereby overcoming the limitations of traditional adhesive-based assembly techniques.
Implementation Method 1
curable adhesive can be applied between the lens holder and the substrate, and the tilt of the lens holder is adjusted until the lens is aligned with the sensor, and then the curable adhesive is cured to fix the lens holder to the substrate
Data Source
AI summary
In a method for assembling a camera module, a sensor module, a lens holder, and a lens assembly are first provided. The sensor module includes a substrate and a sensor positioned on the substrate. The lens holder is positioned on the substrate and accommodates the sensor. The lens assembly is held in the lens holder. At least one of the lens holder and the lens assembly has a chamfer at an end thereof opposite to the substrate and located between the lens holder and the lens assembly. Then, curable adhesive is applied to the chamfer. The tilt of the lens is adjusted until the lens assembly is optically aligned with the sensor. The curable adhesive is cured.