Title:
Metal detecting device
Document Type and Number:
Japanese Patent JP5952677
Kind Code:
B2
Abstract:
The metal detection apparatus comprises a transmitter unit (1), which provides transmitter signals to a transmitter coil (21) that is coupled to a receiver coil (3), which is connected to the input of a receiver unit (4), said transmitter unit (1) comprises a frequency generator (11) that provides an operating frequency (f TX ) to the input of an amplifier stage (12), whose output is connected via a transformer (13) to the transmitter coil (21). According to the invention the output of the amplifier stage (12) is connected to a first tap (141; 142; 143) and the transmitter coil (21) is connected to a second tap (151; 152; 153; 154) of the same transformer winding (131) of the transformer (13), having a number of n winding coils between the first tap and a common potential and a number of n+m winding coils between the second tap (151; 152; 153; 154) and the common potential, wherein the transmitter coil (21) comprises the number of q winding coils and is connected in parallel to a capacitor (221) thus forming a resonant circuit that is tuned to the operating frequency (f TX ) and wherein the ratio (n+m)/q of the winding coils of the transformer winding (131) and the winding coils of the transmitter coil (21) is selected such that the inductance of the transformer winding (131) is at least ten times higher than the inductance of the transmitter coil (21).
Inventors:
David Gregory Lion
Application Number:
JP2012179422A
Publication Date:
July 13, 2016
Filing Date:
August 13, 2012
Export Citation:
Assignee:
METTLER-Toledo Safeline Limited
International Classes:
G01V3/10
Domestic Patent References:
| JP2005345382A | ||||
| JP2007278719A | ||||
| JP2007170885A | ||||
| JP5100047A |
Foreign References:
| US20090167299 |
Attorney, Agent or Firm:
Shinjiro Ono
Yasushi Kobayashi
Hiroyuki Tomita
Osamu Hoshino
Tatsumi Ono
Yasushi Kobayashi
Hiroyuki Tomita
Osamu Hoshino
Tatsumi Ono