Patent ID: 6881966

Claim:
A magnetic deflector for a ribbon-shaped beam or a scanned pencil-shaped beam, comprising a pair of coils comprising a first coil and a second coil, wherein the first and second coils each comprise an iron yoke extending in a width direction along the entire width of the beam, and a conductor wrapped around the iron yoke and extending along the width direction along the entire width of the beam, wherein the first coil is positioned above the beam and the second coil is positioned below the beam, respectively, and wherein current passes through the first and second coils in the same direction, thereby inducing a magnetic field between the coils that is generally perpendicular to a direction of travel of the beam along substantially the entire width of the beam, wherein the first and second coils are positioned to form an input end and an output end, wherein the output end is downstream of the input end, and wherein the output end is larger than the input end.