3 ms·

So winding the coil requires robotics. And any lithography process requires robotics, cleanrooms, aggressive chemistry, vacuum chambers and whatnot.

• quotemstr 6y ago
  Yes, but coiling stuff requires more complex robotics and a robot per coil, since you can wind a wire around only one coil at a time. With big lithography processes, your robot can be simpler (since it doesn't need to reach around or inside a complex shape) and it can process thousands of devices (on a big wafer) all at once instead of individually.
  • megous 6y ago
    Winding a simple coil, like the ones inside speakers, requires just fixing a wire and rotating the core: https://www.youtube.com/watch?v=Np3wogoUsjc https://www.youtube.com/watch?v=Np3wogoUsjc You can make the same maching with many parallel winding heads + cutters and make as many coils as you like in parallel.
    • deleted 6y ago
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    • adamweld 6y ago
      This is absolutely not true for the miniaturized balanced armature drivers that this MEMS speaker design is competing with. The coil must be wound in-situ and is usually epoxy potted due to fragility. https://navcomm.eu/img/cms/BA%20opis.jpg https://navcomm.eu/img/cms/BA%20opis.jpg
      • megous 6y ago
        Hmm, that's quite a different kind of a beast.
• deleted 6y ago
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