Autofocus Camera Module Liquid Lens Assembly Precision
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Solution Overview
Problem
The manufacturing method of autofocus camera modules using Laser Direct Structuring (LDS) technology affects the assembly precision due to the complexity of aligning and electrically connecting the liquid lens with the lens assemblies, leading to potential deviations and inaccuracies in the auto-focusing mechanism.
Innovation Solution
The method involves forming conductive lines on the lens holders using LDS, followed by flip-chip bonding with solder material to connect the liquid lens to the lens assemblies, and using conductive lines to connect the liquid lens to the circuit board, ensuring precise alignment and electrical connectivity without the need for additional heating devices, thus enhancing the assembly precision and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Laser Direct Structuring (LDS) technology is used to form conductive lines on lens assemblies, then electrical connectivity is achieved, but assembly precision deteriorates due to alignment deviations
Solution Approach 1:
The patent applies preliminary action by pre-forming conductive lines on the lens holder and lens assembly before the liquid lens is installed. This allows the conductive structures to be prepared in advance with precise positioning, and then the liquid lens is simply placed into position and electrically connected through soldering, thereby maintaining high assembly precision while achieving reliable electrical connectivity.
2Reliability
If the liquid lens is aligned and electrically connected to lens assemblies through golden wires, then electrical connectivity is established, but assembly precision is affected due to alignment complexity
Solution Approach 1:
The patent extracts the complex wire bonding process and replaces it with direct soldering connections between the liquid lens and pre-formed conductive lines on the lens holder. This eliminates the need for complex golden wire alignment and bonding operations, thereby improving assembly precision while maintaining reliable electrical connectivity.
Solution Approach 2:
The patent introduces conductive lines formed on the lens holder as intermediary elements that bridge the electrical connection between the liquid lens and the lens assembly. These conductive lines serve as precise intermediaries that eliminate the need for direct wire bonding, thereby improving alignment precision while ensuring reliable electrical connectivity.
3Reliability
If multiple manufacturing steps are performed for assembling liquid lens and lens assemblies, then electrical connectivity is achieved, but productivity decreases due to process complexity
Solution Approach 1:
The patent applies preliminary action by pre-forming all necessary conductive lines on the lens holder and lens assembly before the liquid lens installation. This eliminates the need for multiple post-installation electrical connection steps, thereby significantly improving productivity while ensuring reliable electrical connectivity through the pre-prepared conductive structures.
Solution Approach 2:
The patent merges the electrical connection function into the existing lens holder structure by forming conductive lines directly on it. This integration eliminates separate wire bonding operations and combines multiple manufacturing steps into a more efficient single assembly process, thereby improving productivity while maintaining reliable electrical connectivity.
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 rapid quality verification and precise assembly of the autofocus camera module, reducing deviations and improving the auto-focusing performance by directly connecting the liquid lens to the driving elements, enabling effective zooming and maintaining optical axis alignment.
Implementation Method 1
forming a conductive line on a surface of the two lens assemblies by using Laser Direct Structuring (LDS) technology
Implementation Method 2
incorporating the liquid lens between the two lens assemblies and making the liquid lens and the two lens assemblies to be aligned with each other; electrically connecting the liquid lens to the two lens assemblies through golden wires
Data Source
AI summary
An autofocus camera module includes a circuit board with a plurality of driving elements, and a lens mechanism disposed on the circuit board assembly. The lens mechanism includes a first lens assembly, a second lens assembly, and a liquid lens disposed between the first lens assembly and the second lens assembly. The first lens assembly includes a first lens holder, a first lens group housed inside the first lens holder, and a first conductive line disposed on a surface of the lens hold, the first lens holder is connected to one side of the circuit board assembly. The liquid lens includes connecting pads, and each connecting pad is disposed with a solder material, the connecting pads are soldered to the first lens holder through the solder material, the conductive line electrically connects the connecting pads and the plurality of driving elements.