Patent ID: 6836033
Filing Date: 2004-12-28
Classification: B23Q,G02B,H02K

Abstract:
An apparatus for precisely driving X-Y stages using a VCM (Voice Coil Motor), comprising:a stage, which is movable in a first-axis direction with respect to a horizontal plane, including: a pair of first connection units connected to both sides of a specimen transferring part reciprocating in the first-axis direction to mount the specimen transferring part on the upper portion of the first connection units, the first connection units moving together with the specimen transferring unit; a first central unit located between the first connection units; a pair of first supplementary units arranged on both sides of the first central unit in an axial direction in parallel with each other, the pair of first supplementary units supplementing the first central unit; a pair of first straight springs arranged in a row, both sides of the first straight springs being connected between the first supplementary units, the first central unit passing the first straight springs continuously and being fixed to the first straight springs; and a pair of first supplementary straight springs connected to both sides of the first supplementary units in parallel to each other, the first supplementary straight springs being symmetric from the first straight springs, each first connection unit passing the first supplementary straight spring and being fixed to the first supplementary straight spring; a stage, which is movable in a second-axis direction orthogonal to the first-axis direction with respect to the horizontal plane correspondingly connected to the lower portion of the first-axis direction movement stage, the second-axis direction movement stage including: a second central unit reciprocating in the second-axis direction; a pair of second supplementary units arranged at both sides symmetrically to each other in parallel to a movement direction of the second central unit, the pair of second supplementary units supplementing the second central unit; a pair of second straight springs arranged in a row between the second supplementary units, the first central unit passing the second straight springs continuously and being fixed to the second straight springs; a pair of supplementary straight springs connected at both sides of the Second supplementary units in a row, the supplementary straight springs being symmetric from the second straight springs; and a pair of second connection units passing the central portions of the second supplementary straight springs and being fixed to the second supplementary straight springs, wherein the first central unit and the second central unit are crossed at an angle of 90 degrees; a stage base configured in the form of a hexahedron opened at the upper end, wherein the second-axis movement stage is seated on the inside bottom of the stage base by the second connection units fixed to the inside; and a pair of magnetic force generators respectively connected to the first central unit and the second central unit for selectively forcing the second-axis direction movement or the first direction movement in mutual symmetry through a magnetic restriction, so that the specimen transferring part is moved in the first direction to the first central unit and the second central unit is moved in the second-axis direction to the second connection units.