US Patent No. 10,251,269

WIRING BOARD, ELECTRONIC DEVICE, AND LIGHT EMITTING APPARATUS


Patent No. 10,251,269
Issue Date April 02, 2019
Title Wiring Board, Electronic Device, And Light Emitting Apparatus
Inventorship Kensaku Murakami, Kyoto (JP)
Yurie Onitsuka, Kyoto (JP)
Assignee KYOCERA Corporation, Kyoto (JP)

Claim of US Patent No. 10,251,269

1. A wiring board, comprising:an insulating base formed of ceramics;
a recessed portion provided on a side surface of the insulating base, the recessed portion being connected to a lower surface of the insulating base;
an internal wiring conductor disposed in an interior of the insulating base;
an external wiring conductor disposed on the lower surface of the insulating base;
a recessed portion wiring conductor disposed in the recessed portion, the recessed portion wiring conductor being separated from the side surface of the insulating base and being connected to the internal wiring conductor and the external wiring conductor;
a through conductor disposed in an interior of the insulating base, the through conductor electrically connecting the internal wiring conductor and the external wiring conductor,
in a see-through plan view of the insulating base from the lower surface, the recessed portion extending in one direction, the through conductor being disposed in a periphery of an end portion of the recessed portion,
a thin film layer made of a metal and being disposed on the lower surface of the insulating base, in a see-through plan view of the insulating base from the lower surface, the thin film layer not overlapping the recessed portion wiring conductor but overlapping the external wiring conductor and the through conductor,
the recessed portion including a first inner wall surface extending in the one direction and being convex toward the side surface of the insulating base when viewed in a see-through plan view of the insulating base from the lower surface of the insulating base.