Inspection apparatus for printed wiring board

An inspection apparatus for printed wiring board which comprises an off-grid adaptor to be placed on a printed wiring board to be inspected and an inspection head arranged above the off-grid adaptor, characterized in that the off-grid adaptor consists of a pitch-converting board having, on a first side, surface electrodes corresponding to the electrodes to be inspected of the printed wiring board and, on a second side, back electrodes arranged at grids and electrically connected to the surface electrodes, and a first anisotropically electroconductive sheet positioned between said printed board and said pitch-converting board;

• and said inspection head comprises an inspection electrode unit for said printed wiring board, said inspection electrode including an insulating substrate, an inspection electrode element set up on one side of the substrate in which inspection electrodes are formed at standard grids cross-wise arranged which element has a plurality of functional regions each having a plurality of electrodes identically positioned in each of said plurality of functional regions and a connecting material through which correspondingly positioned ones of said inspection electrodes of said plural functional regions are connected together, to form commonized electrodes, wherein the identical positioning of said plurality of inspection electrodes in said plurality of functional regions allows for inspection of said printed wiring board so that individual printed wiring board electrodes to be inspected are individually connected to said commonized electrodes;
• and said apparatus further including a second anisotropically electroconductive sheet, the inspection electrodes of the unit being connected to the back electrodes of the pitch-converting board through the second anisotropically electroconductive sheet and arranged in the grid form.