Detector with triangle-shaped inductor coils
AssigneeHewlett-Packard Development Company, L.P.
InventorStuart Allman
Life of this patent
Estimating the term…
Abstract
A document feeder may include a media transporter to feed a number of sheets of media through a feed path and a detector to detect the presence of a metal object including a number of triangular-shaped inductor coils to detect the metal objects. A method of detecting a metal object coupled to a sheet of media entering a document processing device may include applying an alternating current to a number of triangular-shaped inductor coils to create a magnetic field upstream of a media feed path, detecting a change in a magnetic flux of the magnetic field due to a metal object in the path of said magnetic flux, and producing a warning when the changes in the magnetic flux are detected.
Claims15
A document feeder, comprising:
- a media transporter to feed a number of sheets of media through a feed path;
- and
- a detector to detect the presence of a metal object comprising:
- a plurality of triangular-shaped inductor coils to detect the metal object aligned along a printed circuit board (PCB) in alternating orientations, wherein each of the plurality of triangular-shaped inductor coils is an equilateral triangular-shaped inductor coil and wherein any surface area on the PCB not covered with an equilateral triangular-shaped inductor coil is covered with a non-equilateral triangular-shaped inductor coil.
A document processing device, comprising:
- a feeding device to feed a number of sheets of media from a document tray and into a media feed path within the document processing device;
- and
- a detector to detect foreign objects within the number of sheets of media, comprising:
- a printed circuit board (PCB) comprising a plurality of equilateral triangular-shaped inductor coils and a plurality of non-equilateral-shaped inductor coils, wherein any surface area on the PCB not covered with an equilateral triangular-shaped inductor coil is covered with a non-equilateral triangular-shaped inductor coil.
A method of detecting a metal object coupled to a sheet of media entering a document processing device, comprising:
- applying an alternating current to a plurality of equilateral triangular-shaped inductor coils to create a magnetic field, wherein the plurality of equilateral triangular-shaped inductor coils are situated on a printed circuit board (PCB) further comprising a plurality of non-equilateral triangular shaped inductor coils, wherein any surface area on the PCB not covered with an equilateral triangular-shaped inductor coil is covered with a non-equilateral triangular-shaped inductor coil;
- detecting changes in a magnetic flux of the magnetic field as a metal object passes through the magnetic flux;
- and
- producing a warning when the changes in the magnetic flux are detected.
Dependencies are inferred from the claim text.