Patent ID: 6084494
Filing Date: 2000-07-04
Classification: H01L

Abstract:
A mask support device providing removable attachment of a ferromagnetic mask, said support comprising; first and second elements,said first element having one or more ferromagnetic shunts and a face adapted for coupling to said second element;said second element having three or more magnetic regions and a face adapted for coupling to said first element, said magnetic regions each containing a magnet bounded at north and south ends by ferromagnetic pole members,wherein the first and second element faces adapted for coupling can be coupled in a first position such that the magnetic field of each magnet extends beyond said second element so as to attract said ferromagnetic mask with sufficient force to hold said ferromagnetic mask in said device and in a second position such that the magnetic field of each magnet is redirected through one of said shunts and does not extend beyond said second element in a direction that would attract said ferromagnetic mask with sufficient force to hold said ferromagnetic mask in said device.