Patent ID: 6870952

Claim:
Apparatus for adjusting a position between a multi-layered printed circuit board that includes a plurality of insulated layers and a plurality of conductive layers having a conductive pattern and an object in a producing process of the multi-layers printed circuit board, comprising an invisible mark that can be imaged by Xrays formed on at least one of said layers of said multi-layered printed circuit board, means for irradiating Xrays on an area containing said mark, a projection screen that can convert Xrays to one of visible rays, ultra violet rays or infrared rays for projecting said mark irradiated by Xrays thereon, means for moving at least one of said multi-layered printed circuit board and said object based on said mark projected on said projection screen so as to adjust the relative position therebetween, a visible adjusting mark formed on said object, wherein said means for moving moves at least one of said multi-layered printed circuit board and said object based on said board mark projected on said projection screen and said visible adjusting mark so as to adjust the relative position between said board and said object, wherein said object is a photo mask.