Abstract:
Provided are a wiring substrate including a substrate main body and a metalized layer provided on the front surface of the substrate main body so as to extend along side surfaces thereof, in which a plating film and a brazing material layer covering the surface of the metalized layer are not damaged; a multi-piece wiring substrate array for simultaneously providing a plurality of the wiring substrates; and a method for producing the multi-piece wiring substrate array. The wiring substrate 1a includes a substrate main body 2 which is formed of a ceramic laminate S and has a rectangular shape in plan view, and which has a front surface 3 and a back surface 4 and has four side surfaces 5, each being located between the front surface 3 and the back surface 4, and having a groove surface 7 located on a side toward the front surface 3 and a fracture surface 6 located on a side toward the back surface 4; and a metalized layer 11 which is formed on the front surface 3 of the substrate main body 2 so as to extend along the four side surfaces 5, and which has a rectangular frame shape in plan view, wherein a horizontal surface 13 of the ceramic laminate S of the substrate main body 2 is exposed between the metalized layer 11 and the groove surface 7 of each side surface 5 of the substrate main body 2.
Abstract:
Provided are a wiring substrate having few burrs in the vicinity of a notch located on a side surface of a substrate main body, in which breakage of a conductor layer provided on the inner wall of the notch is suppressed; a multi-piece wiring substrate array for providing a plurality of the wiring substrates; and a method for reliably producing the multi-piece wiring substrate array. The wiring substrate 1a includes a substrate main body kp which is formed of a plurality of stacked ceramic layers S, which has a rectangular shape in plan view, which has a pair of opposite first and second main surfaces 3 and 2, and which has side surfaces 4 each being located between the paired main surfaces 3 and 2, and having a groove surface 6 located on a side toward the first main surface (back surface) 3 and a fracture surface 5 located between the groove surface 6 and the second main surface 2; and a notch 11 which has a concave shape in plan view, and which is provided on a side surface 4 only on a side toward the first main surface 3 so as to extend in a thickness direction of the side surface 4, wherein, in the side surface 4 having the notch 11, the boundary 7 between the groove surface 6 and the fracture surface 5 has first curved portions R1 on opposite sides of the notch 11, the first curved portions R1 being convex toward the first main surface 3 of the substrate main body kp in side view; and also has a second curved portion R2 on a second-main-surface side of the notch 11, the second curved portion R2 being convex toward the second main surface (front surface) 2 of the substrate main body kp in side view.