Method of making a weak-field magnetic field sensor having etched circuit coils

A method of making a weak-field magnetic sensor comprising the steps of:

• making a ring-shaped amorphous core;
• etching a certain coil pattern on the ring-shaped amorphous core;
• etching a first coil on a first epoxy base, a second coil on a second epoxy base, and a circular conductive pattern on an amorphous epoxy base;
• stacking two board sets, each of which includes the first epoxy base, the second epoxy base and the amorphous epoxy base, and the ring-shaped amorphous core so that the ring-shaped amorphous core is located between the board sets;
• and
• pressing together the stacked board sets and the ring-shaped core.

A method of making a weak-field magnetic sensor, comprising the steps of:

• etching on an epoxy base thin board a certain conductor pattern with the capacity for vertical conductivity;
• etching circular conductor patterns on front and back surfaces of at least two amorphous thin boards;
• stacking the epoxy base thin board and the amorphous thin boards so that the epoxy base thin board is located between the amorphous thin boards and pressing the stacked epoxy base thin board and amorphous thin boards together to correspond to the pattern of the epoxy base thin board and the patterns of the amorphous thin boards to form a flat-board shaped amorphous core;
• etching a first coil on a first epoxy base, a second coil on a second epoxy base, and a circular conductive pattern on an amorphous epoxy base;
• stacking the first epoxy base, the second epoxy base and the amorphous epoxy base on an outer portion of at least one surface of the amorphous core;
• and
• pressing together the stacked first epoxy base, second epoxy base, amorphous epoxy base and amorphous core.

A method of making a weak-field magnetic sensor, comprising the steps of:

• making a ring-shaped amorphous core;
• etching a certain coil pattern on the ring-shaped amorphous core;
• etching a first coil on a first epoxy base, a second coil on a second epoxy base, and a circular conductive pattern on an amorphous epoxy base;
• stacking the first epoxy base, the second epoxy base and the amorphous epoxy base on an outer portion of at least one surface of the ring-shaped core;
• and
• pressing together the stacked first epoxy base, second epoxy base, amorphous epoxy base and ring-shaped core.