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Thread: differential drive not new

  1. #1
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    differential drive not new

    Hello all!

    Just read the (exspired) Manger patent and saw one of the drive alternatives uses some kind of differential drive. I donīt know whether the Mangers actually use it, I just know the MSW has two coils.

    http://www.freepatentsonline.com/4029171.html

  2. #2
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    I have had Alpine DDW F30A subs in my car for 12 or so years, so yes they have been around for a while.

  3. #3
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    Quote Originally Posted by el`Ol View Post
    Hello all!

    Just read the (exspired) Manger patent and saw one of the drive alternatives uses some kind of differential drive. I donīt know whether the Mangers actually use it, I just know the MSW has two coils.

    http://www.freepatentsonline.com/4029171.html
    The differential drive has a gap for each VC. Other dual VC designs do not. I couldn't see that in the patent but may have missed it.

  4. #4
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    Quote Originally Posted by Thom View Post
    The differential drive has a gap for each VC. Other dual VC designs do not. I couldn't see that in the patent but may have missed it.
    In the Manger patent the two coils are on one voice coil former with the field of the two gaps in opposite directions.

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