| 摘要 |
PURPOSE:To obtain an electronic device whose size can be reduced while stabilizing the electric characteristics by providing irregularities on the inner surface of a groove during a groove making process. CONSTITUTION:A groove D1, substantially matching the printing pattern of a conductor layer, is made on the upper surface of a green sheet S at a predetermined depth. The inner face of the groove D1 is provided with irregularities D1a. The groove D1 is made by projecting a normal pulse laser light from a laser light source, e.g. a YAG laser, to a mask having a transparent part analogous to the conductor layer, condensing the transmitted light through a lens and focusing on the upper surface of the sheet S in the same shape as the conductor layer, and then fusing and evaporating the focused part. The depth of the groove D1 is regulated by the output laser light. This method reduces the size of the electronic device by decreasing the projection of the conductor layer by an amount corresponding to the depth of the groove. Furthermore, the density is prevented from increasing at the part of the sheet touching the conductor layer by lessening the stress at the time of pressing thus avoiding fluctuation in the permeability after firing. |
