Patent ID: 7157362
Filing Date: 2007-01-02
Classification: H01L,H05K,Y02P

Abstract:
1. A method of fabricating an electronic circuit unit, comprising the steps of: preparing a circuit board comprising a wiring board having a plurality of electrodes of wiring patterns arranged on one surface and a plurality of conducting parts arranged on an opposing surface, and an insulating plate stacked on the opposing surface of the wiring board and covering the plurality of conducting parts, wherein land units are arranged, without a solder resist film, on an exposed surface of the insulating plate and are connected to the conducting parts through connection conductors, mounting the exposed surface of the insulating plate having the land units of the circuit board on a supporting jig; mounting a semiconductor chip on a mounting jig; arranging bumps on the semiconductor chip; moving the mounting jig downward toward the circuit board from an original position; pressing the bumps from the semiconductor chip onto the plurality of electrodes on the one surface of the circuit board while heating, whereby the bumps are adhered to the electrodes and the semiconductor chip is mounted onto the circuit board; returning the mounting jig to the original position; and soldering chip parts to the land units.