Method of producing a coil device, coil device, measuring transducer with coil device, instrument having a measuring transducer

A measuring transducer of an instrument for registering a mass flow or a density of a medium flowing through at least one measuring tube of the measuring transducer, comprising:

• the at least one measuring tube having an inlet and an outlet and adapted to convey the medium between inlet and outlet;
• at least one oscillation exciter, which is adapted to excite the at least one measuring tube to execute oscillations;
• at least two oscillation sensors, which are adapted to register deflection of the oscillations of at least one measuring tube;
• wherein at least one oscillation exciter as well as the oscillation sensors have, in each case, a coil device with, in each case, at least one coil, as well as, in each case, a magnet apparatus,
• wherein the magnet apparatus and the coil device are movable relative to one another, and
• wherein the magnet apparatus and the coil device of an oscillation exciter, or oscillation sensor, interact with one another by using magnetic fields,
• wherein the oscillation sensors have, in each case, a coil device, wherein the coil device includes:
• a circuit board having at least one circuit board layer, wherein each circuit board layer has a first face and an opposite, second face,
• at least one coil adapted for registering or producing a time varying magnetic field, wherein the coil is embodied at least sectionally by using an electrically conductive trace, wherein the coil is arranged on the first face or second face of a circuit board layer,
• wherein the at least one coil has a first coil end and a second coil end,
• wherein the coil device has at least at least one of a plurality of contacting elements connected with the first coil end and at least at least one of the plurality of contacting elements connected with the second coil end, via which at least one of the plurality of contacting elements the coil device is connectable by using electrical connection lines to an electronic measuring/operating circuit of an instrument,
• wherein the circuit board has in an edge area at least one depression having a floor and a border,
• wherein at least one of the plurality of contacting elements is arranged on the floor of each depression,
• wherein at least one electrical connection line of the coil device has a first end, the first end is arranged in the depression,
• wherein the depression is filled at least partially with a solid metal microparticle mass, which holds the first end and forms an electrical connection between the electrical connection line and the at least one of the plurality of contacting elements.