Optical Fiber Scanning Device with Four Coil Assemblies
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Solution Overview
Problem
Existing optical fiber scanning devices for endoscopes face challenges in achieving efficient and stable scanning due to limitations in controlling the magnetic fields and detecting variations, leading to suboptimal image acquisition in dark environments.
Innovation Solution
The optical fiber scanning device incorporates a cylindrical housing with an optical fiber, a magnet, and four coil assemblies, including drive coils and detection coils, which generate and detect magnetic fields to control the scanning process, allowing for precise two-dimensional scanning and efficient light spot movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional optical fiber scanning device uses a single drive coil and sensor coil arrangement, then the device structure is simple, but the scanning stability and image acquisition efficiency are insufficient
Solution Approach 1:
The single coil assembly is segmented into four separate coil assemblies arranged at rotationally symmetrical positions (0°, 90°, 180°, 270°) around the optical fiber. Each coil assembly includes a drive coil and a detection coil, allowing independent control and detection in different spatial directions, thereby improving scanning stability through multi-point control
Solution Approach 2:
The drive coil and detection coil are merged into a single integrated coil assembly unit. This combination allows simultaneous driving and detection functions to be performed by each assembly, reducing overall system complexity while achieving stable two-dimensional scanning through coordinated operation of four assemblies
2Measurement precision
If the optical fiber scanning device uses multiple coil assemblies to improve scanning precision, then the measurement precision improves, but the device diameter increases
Solution Approach 1:
The scanning system transitions from one-dimensional linear coil arrangement to two-dimensional rotational symmetry arrangement around the optical fiber. The four coil assemblies are positioned at 0°, 90°, 180°, and 270° angles, creating a compact circular configuration that achieves two-dimensional scanning precision without significantly increasing the radial device diameter
Solution Approach 2:
The system uses dynamic feedback control where detection coils continuously monitor the magnetic field position and provide real-time feedback to adjust drive coil currents. This dynamic adjustment enables high scanning precision while maintaining a compact device structure through adaptive control rather than rigid mechanical precision
3Productivity
If the device uses four coil assemblies with rotationally symmetrical arrangement, then the scanning efficiency and image acquisition improve, but the power consumption increases
Solution Approach 1:
The four coil assemblies operate in a periodic sequential manner rather than simultaneously at full power. The drive signals are applied in alternating phases to different coil pairs, and detection is performed in periodic cycles, reducing peak power consumption while maintaining continuous scanning capability and high image acquisition efficiency
Solution Approach 2:
Detection coils provide real-time feedback on magnetic field position and scanning state, enabling the control system to adjust drive signals dynamically. This feedback mechanism optimizes power distribution across the four coil assemblies, applying power only when and where needed, thereby reducing overall power consumption while maintaining high scanning efficiency
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 enables efficient and stable scanning with improved image acquisition capabilities, reducing the device's diameter and power consumption while maintaining high driving efficiency, making it suitable for small-diameter endoscope applications.
Implementation Method 1
four drive coils that are disposed in the housing and configured to drive the free end of the optical fiber by applying, to the magnet, a magnetic field generated by a received drive power signal
Implementation Method 2
four detection coils that are disposed in the housing and configured to output an induced electromotive force signal corresponding to variation of a magnetic field
Data Source
AI summary
An optical fiber scanning device includes a housing, an optical fiber configured to emit light, a magnet disposed on the optical fiber, four drive coils configured to drive the optical fiber by applying to the magnet a magnetic field generated by a received drive power signal, and four detection coils configured to output an induced electromotive force signal corresponding to variation of a magnetic field, wherein the drive power signal is controlled based on the induced electromotive force signal, and four coil assemblies each including any one of the drive coils and any one of the detection coils are disposed at rotationally symmetrical positions so as to interpose the optical fiber among the four coil assemblies.