Metal detector
AssigneeMinelab Electronics Pty Limited
InventorBruce Halcro Candy
Life of this patent
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Abstract
A metal detector for detecting a target, the metal detector including: a transmitter for transmitting a transmitted magnetic field; a receiver, including a winding with a plurality of turns, for receiving a magnetic field; and a receive electronics connected to the winding for receiving signals from the winding. The receiver further includes an electrostatic screen covering at least part of the winding. The electrostatic screen is connected to an electronic circuit to receive signals from the receiver to reduce an effective capacitance presented by the electrostatic screen to the winding.
Claims14
A metal detector for detecting a target, the metal detector comprising:
- a transmitter for transmitting a transmitted magnetic field;
- a receiver, comprising a winding with a plurality of turns, for receiving a magnetic field;
- and
- a receive electronics connected to the winding for receiving signals from the winding;
- wherein the receiver further comprises an electrostatic screen covering at least part of the winding, wherein the electrostatic screen is not directly connected to a ground;
- wherein the electrostatic screen is connected to an electronic circuit to receive signals from the receiver through the electronic circuit to reduce an effective capacitance presented by the electrostatic screen to the winding;
- and
- wherein the signals from the electronic circuit to the electrostatic screen are dependent on the receiving signals from the winding.
An antenna for a metal detector, including:
- at least a winding, the winding comprises a plurality of turns connected to receive electronics of the metal detector;
- and
- an electrostatic screen covering at least part of the winding;
- wherein the electrostatic screen is connected to an electronic circuit of the metal detector to receive a signal from the antenna through the electronic circuit to reduce an effective capacitance presented by the electrostatic screen to the winding, wherein the electrostatic screen is not directly connected to a grounds;
- and
- wherein the signals from the electronic circuit to the electrostatic screen are dependent on the receiving signals from the winding.
Dependencies are inferred from the claim text.