| 摘要 |
PURPOSE:To reduce external magnetic fields produced by plate type permanent magnet incorporated in bubble modules without increasing weight nor price by arranging magnetic bubble units in the opposite directions alternately and cancelling module external magnetic fields by each other. CONSTITUTION:The direction 6' of the magnetic field produced by the plate type permanent magnet of the magnetic field correction type magnetic bubble module is the same as the direction of fitting legs 4, namely, opposite to that of a general module and of almost the same size. Those modules are packaged so that their magnetic fields face up and down alternately. Consequently, external magnetic fields generated by plate type permanent magnets cancel each other on the board wherein plural bubble modules are packaged. Therefore, when corrections are made to approximate the composite magnetic field outside of the bubble modules to zero, the need for a special magnet for the correction and a shield case is eliminated, so the weight, shape, and price are reduced. |
