Ultrathin Variable Aperture Mechanism Utilizing a Micro Flat Motor With a Multipole Ring Magnet
Recent advancements in smartphone camera technology have led to the integration of variable aperture mechanisms to enhance the image quality. This study introduces a 0.8 mm thick variable aperture mechanism driven by a micro flat motor. The motor incorporates an 80 poles ring magnet, magnetized usin...
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| Format: | Article |
| Language: | English |
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IEEE
2025-01-01
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| Series: | IEEE Access |
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| Online Access: | https://ieeexplore.ieee.org/document/10833604/ |
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| author | Keita Nagai Riku Fukazawa Yu Okawara Haruhiro Komura Tadahiko Shinshi |
| author_facet | Keita Nagai Riku Fukazawa Yu Okawara Haruhiro Komura Tadahiko Shinshi |
| author_sort | Keita Nagai |
| collection | DOAJ |
| description | Recent advancements in smartphone camera technology have led to the integration of variable aperture mechanisms to enhance the image quality. This study introduces a 0.8 mm thick variable aperture mechanism driven by a micro flat motor. The motor incorporates an 80 poles ring magnet, magnetized using a laser-assisted local heating method, with an outer diameter of 9.6 mm, inner diameter of 7 mm, and thickness of 0.3 mm, and magnetization width of 0.3 mm. The stator features a two-phase planar micro meander coil with a mechanical angle shift of 2.25°, enabling rotational angle control using Hall sensors and a phase-locked loop. The experimental tests demonstrated that the motor achieved a step response with a target angle of 9° and a settling time of 0.18 s. The aperture mechanism, comprising six polyacetal polymer blades, successfully demonstrated opening and closing operations with the opening diameter changed from 6.1 to 1.4 mm by the motor rotation. |
| format | Article |
| id | doaj-art-a3449e79ea31452c9a5fe108b0c32470 |
| institution | Kabale University |
| issn | 2169-3536 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Access |
| spelling | doaj-art-a3449e79ea31452c9a5fe108b0c324702025-01-15T00:03:14ZengIEEEIEEE Access2169-35362025-01-01137672768210.1109/ACCESS.2025.352714610833604Ultrathin Variable Aperture Mechanism Utilizing a Micro Flat Motor With a Multipole Ring MagnetKeita Nagai0https://orcid.org/0009-0007-3918-423XRiku Fukazawa1Yu Okawara2Haruhiro Komura3Tadahiko Shinshi4https://orcid.org/0000-0002-9090-3160Laboratory for Future Interdisciplinary Research of Science and Technology (FIRST), Institute of Innovative Research (IIR), Tokyo Institute of Technology, Yokohama, JapanDepartment of Mechanical Engineering, Tokyo Institute of Technology, Yokohama, JapanMinebeaMitsumi Inc., Kitasaku, Nagano, JapanMinebeaMitsumi Inc., Kitasaku, Nagano, JapanLaboratory for Future Interdisciplinary Research of Science and Technology (FIRST), Institute of Innovative Research (IIR), Tokyo Institute of Technology, Yokohama, JapanRecent advancements in smartphone camera technology have led to the integration of variable aperture mechanisms to enhance the image quality. This study introduces a 0.8 mm thick variable aperture mechanism driven by a micro flat motor. The motor incorporates an 80 poles ring magnet, magnetized using a laser-assisted local heating method, with an outer diameter of 9.6 mm, inner diameter of 7 mm, and thickness of 0.3 mm, and magnetization width of 0.3 mm. The stator features a two-phase planar micro meander coil with a mechanical angle shift of 2.25°, enabling rotational angle control using Hall sensors and a phase-locked loop. The experimental tests demonstrated that the motor achieved a step response with a target angle of 9° and a settling time of 0.18 s. The aperture mechanism, comprising six polyacetal polymer blades, successfully demonstrated opening and closing operations with the opening diameter changed from 6.1 to 1.4 mm by the motor rotation.https://ieeexplore.ieee.org/document/10833604/Aperture mechanismlaser-assisted heatingmagnetic MEMSmicro magnetizationmultipole magnetization |
| spellingShingle | Keita Nagai Riku Fukazawa Yu Okawara Haruhiro Komura Tadahiko Shinshi Ultrathin Variable Aperture Mechanism Utilizing a Micro Flat Motor With a Multipole Ring Magnet IEEE Access Aperture mechanism laser-assisted heating magnetic MEMS micro magnetization multipole magnetization |
| title | Ultrathin Variable Aperture Mechanism Utilizing a Micro Flat Motor With a Multipole Ring Magnet |
| title_full | Ultrathin Variable Aperture Mechanism Utilizing a Micro Flat Motor With a Multipole Ring Magnet |
| title_fullStr | Ultrathin Variable Aperture Mechanism Utilizing a Micro Flat Motor With a Multipole Ring Magnet |
| title_full_unstemmed | Ultrathin Variable Aperture Mechanism Utilizing a Micro Flat Motor With a Multipole Ring Magnet |
| title_short | Ultrathin Variable Aperture Mechanism Utilizing a Micro Flat Motor With a Multipole Ring Magnet |
| title_sort | ultrathin variable aperture mechanism utilizing a micro flat motor with a multipole ring magnet |
| topic | Aperture mechanism laser-assisted heating magnetic MEMS micro magnetization multipole magnetization |
| url | https://ieeexplore.ieee.org/document/10833604/ |
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