New Minelab Go Find Series Coil

[WM6]

Do you understand why the solder dags can cause apparent false ground noises? Why they can give a signal even though they don't move relative to the coil?

No! Would you be so kind and explain this matter in simple "non patent language" way? Thanks.

[Altra]

I think as the coil moves over magnetized ground (static or dynamic) it generates eddy currents in the solder.
Which are then picked up in the coil winding as modulations in sync with coil movement. Seems extreme to shield a
solder joint. But maybe the patent covers something more practical like shielding a pcb in the coil?

Hope Crane will explain his understanding.

[WM6]

In theory yes, but in practice coil moving over magnetized ground should be too weak EC response in small solder joint.

Eddy current can be generated by changeable magnetic field only. Are there changeable magnetic field around coil solder joint?
Despite solder joint is not moving regarding coil?

From my point of view: Answer is yes. When such solder joint will be detected depend (if we are talking of PI) of solder joint TC and detector sampling time delay.

Building hypersensitive PI detectors and using Litz wire in coil, there is a reason to make solder joints "invisible" by magnetic field through shielding bypass.

But question is: is this something not known in science (prior art) yet, something that need to be patented?
Par example: if I use my hat, in need, to collect strawberries, may I later patent such hat collecting idea as "strawberry hat"?

[crane]

Like I said, this has been discussed here before.

It is best demonstrated with a ground balancing PI detector because it tends to ignore soft ferrite.

Place the coil flat on the ground away from metal, then place a coin on the ground at a distance from the edge of the coil where it would be detected if moving. The coin will then give a response if you pass a soft ferrite rod over the coin even though the coil and coin are both stationary. The same occurs if the solder dag and wire gauge etc is large enough to give a signal if moving relative to the coil, which is obviously possible with detectors that sample early.

Conveyor belt metal detectors suffer the same problem if they contain excess metal or are mounted near fixed metal objects and the moving ore has similar properties to the ferrite and distorts the magnetic field.

A coil containing excess detectable metal will have you digging very distinct ghost target signals in mineralised ground that don't actually exist.