Abstract: This invention describes the new structure of a field emission cathode based flat panel display that comprises a main space and an attached auxiliary space, whose volume is larger than that of the main space. In this structure evacuation of the volume of the FED can be carried out more easily. Also getters to eliminate a build up of pressure after sealing off process can be included in the auxiliary tank and high vacuum can be maintained for the lifetime of the FED.

Abstract: A method and device of correcting a welding path of an automatic welding apparatus are disclosed. In order to prevent the deviation of a welding torch from the predetermined welding path due to deformation of structure, a position correction amount is used. The position correction amount is determined by setting a mean welding current for the up-down direction position correction, which is determined by averaging the welding current, and by setting a weight value for the left-right direction position correction, in which the weight value is determined by multiplying the welding current by a weight factor, thereby a welding torch follows the predetermined welding path precisely.