Abstract: A metal detection device is capable of effectively detecting a metal mixed in food or the like by generating AC magnetic field simultaneously tuned to respective frequencies by a single transmission coil in response to frequency components of different frequencies without switching an element by a switch or the like. Constituent elements constituting magnetic field generation portion are connected so that a transmission coil L1 and a capacitor C1 resonate in the first frequency F1. Moreover, constituent elements are connected so that the transmission coil L1 and a capacitor C2 resonate in the second frequency F2. Furthermore, constituent elements function so as to effectively separate the capacitor C1 and capacitor C2 so that they do not interfere at least in the same frequency.

Abstract: There is provided a metal detection device capable of effectively detecting a metal mixed in food or the like by generating AC magnetic field simultaneously tuned to respective frequencies by a single transmission coil in response to frequency components of different frequencies without switching an element by a switch or the like. Constituent elements constituting magnetic field generation means (2) are connected so that a transmission coil L1 and a capacitor C1 resonate in the first frequency F1. Moreover, constituent elements are connected so that the transmission coil L1 and a capacitor C2 resonate in the second frequency F2. Furthermore, constituent elements function so as to effectively separate the capacitor C1 and capacitor C2 so that they do not interfere at least in the same frequency.

Abstract: A memory (33) is provided for storing in advance data of signals supplied from a detector unit (26) when a plurality of metallic foreign matter samples differing in magnitude passes an alternating field, and data representing the magnitude of each foreign matter sample. A setting device (32) causes an indicator 36 to display the magnitude of metal detectable by a determination device (31) on the basis of those data on the foreign matter samples. Further, a contained metal displaying device (34), when the determination device (31) has determined that metallic foreign matter is contained in the object of inspection, displays the magnitude of that metal content on the indicator (36). The user can intuitively grasp the detectable magnitude of metal and the magnitude of the metal contained in the object of inspection.

Abstract: A memory 33 storing in advance data of signals supplied from a detector unit 26 when a plurality of metallic foreign matter samples differing in magnitude are caused to pass an alternating field and data representing the magnitude of each foreign matter sample is provided. Setting means 32 causes an indicator 36 to display the magnitude of metal detectable by determination means 31 on the basis of those data on the foreign matter samples. Further, contained metal displaying means 34, when the determination means 31 has determined that metallic foreign matter is contained in the object of inspection, causes the magnitude of that metal content to be displayed on the indicator 36. The user is enabled to intuitively grasp the detectable magnitude of metal and the magnitude of metal contained in the object of inspection.