Compact Optical Module for Endoscopes Using VCSEL and Fiber Nesting
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Solution Overview
Problem
There is a challenge in reducing the diameter and length of optical modules and image pickup modules, particularly those used in endoscopes, while maintaining effective optical signal transmission via optical fibers.
Innovation Solution
The design incorporates a vertical cavity surface emitting laser (VCSEL) optical element mounted on a first wiring board with a holding member and optical fiber, along with side surface wiring boards and signal cables, to create a compact E/O optical module that converts electric signals into optical signals for transmission through the fiber, ensuring a small size and narrow diameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an image pickup device including a large number of pixels is used to increase signal amount, then image quality is improved, but the diameter and length of the optical module increase
Solution Approach 1:
The patent transitions from electric signal transmission to optical signal transmission, changing the dimension of signal carrier. This allows higher bandwidth and better image quality without proportionally increasing module size, as optical fibers can transmit more data per unit length compared to electrical wires.
Solution Approach 2:
The optical fiber is inserted into a holding member (ferrule) that is mounted on the wiring board, creating a nested structure. This compact arrangement allows the optical components to be tightly integrated, reducing the overall module volume while maintaining high pixel count capabilities.
2Productivity
If optical signal transmission is implemented to increase signal amount, then transmission efficiency is improved, but device complexity increases
Solution Approach 1:
The patent combines the optical element, holding member, wiring board, and optical fiber into a single integrated optical module assembly. This merging of components simplifies the overall system architecture by consolidating multiple functions into one unit, reducing device complexity despite the advanced optical transmission capabilities.
Solution Approach 2:
The wiring board serves multiple functions: it provides electrical connections for the image pickup device, mechanical support for the optical elements, and structural integration for the optical fiber. This multi-functionality reduces the need for separate components, thereby reducing overall device complexity.
3Adaptability or versatility
If module diameter is reduced to fit endoscope constraints, then adaptability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The holding member (ferrule) is pre-positioned and fixed on the wiring board at precise locations before optical fiber insertion. This preliminary positioning ensures that when the optical fiber is inserted, the alignment between the optical element and fiber is already optimized, reducing the need for post-assembly adjustments and maintaining high precision in compact dimensions.
Solution Approach 2:
The patent applies precise localization techniques specifically at critical interfaces (optical element to fiber coupling point) rather than requiring uniform high precision throughout the entire module. The holding member provides localized precision positioning where it matters most for optical coupling, while other areas can tolerate less stringent tolerances, enabling compact design.
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 configuration allows for efficient optical signal transmission while minimizing the module's size and length, making it suitable for use in endoscopes, and enhances bonding reliability and noise resistance.
Implementation Method 1
an optical element including a light emitting section or a light receiving section... a vertical cavity surface emitting laser (VCSEL) optical element... converts electric signals into optical signals
Implementation Method 2
an optical fiber for transmitting the optical signal... transmits the optical signal via an optical fiber
Data Source
AI summary
An optical module includes an optical element including a light emitting section, a first wiring board, on a first principal plane of which the optical element is mounted, a ferrule functioning as a holding member including a through hole and disposed on a second principal plane of the first wiring board, an optical fiber inserted into the through hole of the ferrule, a side surface wiring board, a third principal plane of which is disposed in parallel to an optical axis and an end portion of which is connected to the first wiring board, an electrode being disposed on a fourth principal plane of the side surface wiring board, and a signal cable having a distal end portion bonded to the electrode of the side surface wiring board.