Optical Socket Mechanical Datum Alignment for Flip Chip Assembly
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Solution Overview
Problem
The precise alignment requirements in optoelectronic systems, particularly for optical connectors and sockets, lead to increased assembly costs and complexity due to the need for high-precision manufacturing and equipment, resulting in longer assembly times and higher costs.
Innovation Solution
The use of mechanical datums on interposers and optical sockets allows for increased solder placement tolerance up to 30 μm, reducing the need for precise alignment with substrate solder pads, and enabling self-alignment of optical components via flip chip pads and solder reflow, thereby simplifying the assembly process and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-precision manufacturing and equipment are used to achieve precise alignment of optical connectors and sockets, then alignment precision is improved, but assembly costs and complexity increase
Solution Approach 1:
The patent introduces mechanical datums as intermediary reference features on both the interposer and optical socket. These datums serve as mediators that enable precise alignment without requiring complex alignment equipment. The mechanical datums provide a simple reference system that guides the positioning of optical components during assembly, thereby reducing assembly complexity while maintaining high alignment precision.
Solution Approach 2:
The optical socket is designed with mechanical datums that enable self-alignment with the interposer during assembly. The socket automatically positions itself relative to the interposer using the mechanical datum features, eliminating the need for external alignment equipment or complex positioning procedures. This self-aligning mechanism reduces both assembly complexity and costs while ensuring precise alignment.
2Manufacturing precision
If high-precision manufacturing and equipment are used to achieve precise alignment of optical connectors and sockets, then alignment precision is improved, but assembly time increases
Solution Approach 1:
The mechanical datums act as pre-established reference intermediaries that guide alignment quickly and accurately. Instead of requiring time-consuming manual alignment procedures or complex equipment setup, the mechanical datums provide immediate geometric references that enable rapid positioning of the optical socket relative to the interposer, thereby reducing assembly time while maintaining precision.
Solution Approach 2:
The self-aligning mechanism through mechanical datums allows the optical socket to automatically position itself during assembly. This eliminates the need for operators to perform time-consuming alignment adjustments or for complex alignment equipment to be set up and calibrated, significantly reducing assembly time while ensuring consistent alignment precision.
3Device complexity
If increased solder placement tolerance is allowed, then assembly complexity is reduced, but alignment precision may deteriorate
Solution Approach 1:
The patent separates the alignment function from the soldering function by introducing mechanical datums dedicated solely to alignment. The mechanical datums provide precise alignment references independent of solder pad positions, allowing solder placement tolerance to be increased without compromising alignment precision. This segmentation of functions enables each process to be optimized independently.
Solution Approach 2:
The mechanical datums serve as intermediary alignment references that are independent of the soldering process. By using mechanical datums rather than solder pads for alignment, the system decouples alignment precision from solder placement precision, allowing larger solder tolerances while maintaining tight alignment controls through the mechanical datum system.
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 improves assembly tolerance, reduces assembly time and costs, and allows for the use of automated high-volume flip chip assembly processes, while maintaining precise alignment of optical connectors with optoelectronic arrays.
Implementation Method 1
the solder self-aligns the optical socket to the interposer
Data Source
AI summary
Optoelectronic systems and methods of assembly thereof are described herein according to the present disclosure. An example of an optoelectronic described herein includes a substrate and an interposer coupled to the substrate including one or more optical emitters and one or more photodetectors to be mounted thereto. The interposer is fabricated with one or more mechanical datums located on the interposer with respect to flip chip pads to position and couple the optical emitters and photodetectors to the interposer. The optoelectronic system also includes an optical connector and an optical socket that includes one or more mechanical datums corresponding to the mechanical datums of the interposer. The optical socket is configured to align the optical connector with the optical emitters and the photodetectors when the optical socket is coupled to the substrate and the optical connector is received within the optical socket. The mechanical datums of the optical socket contact respective mechanical datums of the interposer when the optical socket is coupled to the substrate.