Resources Contact Us Home
Metal detector

Image Number 8 for United States Patent #8473235.

The present invention provides apparatus for scanning a product to detect metal in that product. The apparatus comprises a drive coil (4), for generating an electromagnetic field in the product, and a detection coil arranged to detect fluctuations in the magnetic field caused by the presence of a metallic particle in the product. A drive circuit (26) for the drive coil (4) comprises a plurality of switches (19 to 22) driven by a controller (16), which switch alternately connect the drive coil across a potential difference to cause the drive coil to be driven at an operating frequency determined by operation of the switches. Using a switching circuit to drive the drive coil (4) greatly increases the number of frequencies at which the drive coil may be operated. The invention has particular application to the food industry.

  Recently Added Patents
Method of manufacturing semiconductor device and semiconductor device
Computer-implemented method of constructing a stock index using index rotation
Mobile terminal based on W-CDMA system having receive diversity function and system thereof
Antennas and their coupling characteristics for wireless power transfer via magnetic coupling
Expressive grouping for language integrated queries
Memory circuit and method of forming the same using reduced mask steps
Online data conversion technique using a sliding window
  Randomly Featured Patents
Caddy for carrying golfing items
Developing device for copier
Combined angle demodulator and digitizer
Parallel computer system including arrangement for transferring messages from a source processor to selected ones of a plurality of destination processors and combining responses
Self-heating cosmetic
Online, safe service technique for automated libraries
Method for black trapping and under print processing
Shaving apparatus
Recording medium, read/write method thereof and read/write apparatus thereof
Light fixture