Optical Lens Adhesive Blocking for Tolerance Compensation
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Solution Overview
Problem
The assembly of multi-group lenses in camera modules is challenging due to part tolerance and assembly tolerance, which affect imaging quality and yield. Additionally, the flow of adhesive material during assembly can lead to contamination and reliability issues.
Innovation Solution
The solution involves an optical lens design with a first and second lenses part, where a first adhesive material is used to fix these parts together after active calibration. Adhesive blocking portions are strategically placed to prevent adhesive overflow and contamination, ensuring precise assembly and improved reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lenses is increased to achieve high-quality imaging, then the imaging capability is improved, but the assembly tolerance and part tolerance accumulate, affecting the final imaging quality
Solution Approach 1:
The lens assembly is divided into multiple independent lens groups (first lens group, second lens group, third lens group, fourth lens group) that can be assembled separately and then integrated. Each group can be independently adjusted and calibrated, reducing the cumulative effect of tolerances across the entire assembly process.
Solution Approach 2:
Active calibration is performed on each lens group before final assembly to pre-adjust and compensate for potential tolerance issues. This preliminary adjustment ensures that when groups are combined, the cumulative tolerance does not degrade imaging quality.
2Reliability
If adhesive material is applied to fix lens parts, then the assembly is secured, but the adhesive material flows and spreads to undesired positions, causing contamination and reliability issues
Solution Approach 1:
The harmful flowing behavior of adhesive material is extracted and isolated by introducing adhesive blocking portions (ridges or barriers) that physically separate the adhesive from critical areas. These blocking structures are strategically placed to prevent adhesive from reaching optical surfaces or mixing with other adhesives.
Solution Approach 2:
Adhesive blocking portions serve as intermediary structures between the adhesive material and the lens components. These blockers act as a physical barrier that allows the adhesive to perform its bonding function while preventing it from causing contamination or reliability issues.
3Strength
If adhesive material is squeezed into the gap between lens parts during assembly, then the parts are bonded, but the adhesive flows into the inside of the lenses, affecting performance and reliability
Solution Approach 1:
The adhesive blocking portions are strategically positioned at specific locations where adhesive intrusion would be most harmful. The blocking structures create localized containment zones that allow adhesive to bond parts together while preventing it from entering critical optical regions where it would degrade performance.
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 approach allows for precise adjustment and fixing of lenses parts, compensating for assembly and part tolerances, and preventing adhesive contamination, thereby enhancing imaging quality and module reliability.
Implementation Method 1
after being cured, the first adhesive material is adapted for supporting and fixing the first lenses part and the second lenses part
Data Source
AI summary
The optical lenses include a first lenses part including a first lens and a second lenses part including a second lens. The second lens and the first lens constitute an imageable optical system. A first adhesive material is located in a first gap between the first and second lenses parts, the first adhesive material supporting and fixing the first and second lenses parts. The first lenses part has a first bottom surface, and the second lenses part has a second top surface. An adhesive applying area for arranging the first adhesive material is provided on the first bottom surface and/or the second top surface. A first adhesive blocking portion is provided on the first bottom surface and/or a third adhesive blocking portion is provided on the second top surface.