Optical Transmission Device Flexible Board Arm Positioning
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Solution Overview
Problem
The existing methods for miniaturizing optical modules face challenges in efficiently soldering terminals on ceramic boards to FPC boards, leading to increased high-frequency propagation loss and impedance mismatches due to the small exposed area of the ceramic board, which complicates positional adjustment and reduces manufacturing efficiency.
Innovation Solution
The optical transmission device incorporates a flexible board with arm parts that project outward to temporarily lock onto the optical modulation package, improving the positioning and soldering efficiency by allowing the end part of the electrode arrangement to easily contact the exposed ceramic board terminals, thereby enhancing the soldering process without enlarging the ceramic board's exposed area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the ceramic board is made to project largely from the package to enlarge the exposed part, then the ease of soldering is improved, but the high-frequency propagation loss increases and the frequency bands degrade
Solution Approach 1:
The FPC board is divided into two functional parts: an electrode arrangement part for signal transmission and an arm part for positioning. This segmentation allows the electrode arrangement part to remain compact (reducing propagation loss) while the arm part extends to provide positioning assistance (improving soldering ease).
Solution Approach 2:
The arm part acts as an intermediary between the FPC board and the optical modulation package. It provides mechanical positioning and support without being part of the signal transmission path, thus improving soldering ease while maintaining signal integrity and reducing propagation loss.
2Volume of moving object
If the pitches between the terminals on the ceramic board are reduced to miniaturize the package, then the device size is reduced, but the positional adjustment between terminals and electrodes becomes difficult
Solution Approach 1:
The arm part serves as a positioning intermediary that extends toward the optical modulation package, providing mechanical guidance and alignment assistance. This enables precise positional adjustment between the terminals and electrodes even when pitches are reduced, facilitating easy assembly despite miniaturization.
Solution Approach 2:
The arm part extends in a direction perpendicular to the electrode arrangement, adding a dimensional element for positioning. This allows positional adjustment to occur in the extension direction rather than requiring larger lateral spacing, enabling miniaturization while maintaining adjustability.
3Productivity
If the arm part of the FPC board extends toward the optical modulation package, then the work efficiency of soldering is improved, but the device complexity increases
Solution Approach 1:
The arm part performs multiple functions: it provides mechanical positioning, supports the FPC board during assembly, and guides alignment between terminals and electrodes. By consolidating these functions into a single structural element, the design achieves improved soldering efficiency without proportionally increasing complexity.
Solution Approach 2:
The positioning and support functions are merged into the arm part of the FPC board itself, rather than requiring separate positioning mechanisms or fixtures. This integration improves soldering work efficiency while minimizing the increase in overall device complexity.
Data Source
AI summary
An optical transmission device includes: an optical modulation package that includes a plurality of terminals that are exposed to an outside from a front surface thereof, and performs optical modulation on electrical signals input from the terminals; a flexible board that includes: an electrode arrangement part on which electrodes respectively connected to the terminals are arranged side by side to transmit the electrical signals to the terminals; and an arm part that projects more outward than an electrode located on an end of the electrode arrangement part and extends toward the optical modulation package to be locked to the optical modulation package; and an optical transmission member that transmits an optical signal obtained by the optical modulation performed by the optical modulation package.