Patent ID: 7821283

Claim:
A circuit board device for wafer inspection used for conducting electrical inspection of a plurality of integrated circuits formed on a wafer in a state of the wafer and comprising a board body composed of a wiring board having connecting electrodes on a front surface thereof, and a connector device provided on the front surface of the board body and comprising a plurality of connector units stacked on each other, wherein each of the connector units in the connector device has a first anisotropically conductive elastomer sheet, a composite conductive sheet arranged on the first anisotropically conductive elastomer sheet, a second anisotropically conductive elastomer sheet arranged on the composite conductive sheet and a pitch converting board arranged on the second anisotropically conductive elastomer sheet and composed of a wiring board having connecting electrodes on a front surface thereof and terminal electrodes on a back surface thereof, wherein the composite conductive sheet has an insulating sheet, in which a plurality of through-holes each extending in a thickness-wise direction of the insulating sheet have been formed, and rigid conductors respectively arranged into the through-holes in the insulating sheet so as to protrude from both surfaces of the insulating sheet, and in each of the rigid conductors, terminal portions having a diameter greater than the diameter of the through-hole are formed on both ends of a body portion inserted into the through-hole in the insulating sheet in order for the conductor to be provided movably in the thickness-wise direction of the insulating sheet, and wherein each of the connecting electrodes in the board body is connected to the terminal electrodes in the pitch converting board of a first of the plurality of the connector devices through the anisotropically conductive elastomer of the first of the plurality of connector devices, and the connecting electrodes in the pitch converting board of the first of the plurality of connector devices is electrically connected to the terminal electrodes in the pitch converting board of a second of the plurality of the connector devices through the anisotropically conductive elastomer of the second of the plurality of connector devices, the pitch converting board in each of the first and second connector devices being arranged just above its respective anisotropically conductive elastomer sheet.