A printed circuit board includes an insulating layer, a circuit pattern on the insulating layer, and a surface treatment layer on the circuit pattern. The surface treatment layer includes a bottom surface having a width wider than a width of a top surface of the circuit pattern.

A design method and a packaging method for a PCB board to avoid patch element tombstone, and a PCB board are provided. The method includes: providing at least one patch element placement area on a PCB board, providing pads in each patch element placement area, where each pad group includes two pads, and the two pads are arranged side by side; establishing pad limit areas around the pads; and reflow soldering the patch element to the PCB board. With the above method, the tombstone phenomenon of the patch element can be effectively prevented, the design efficiency is improved, the workload of manual operation of the engineer is reduced, and an error rate is reduced.

Provided is an electronic circuit substrate in which any excess space is not necessary around an electronic component, and position deviation at a time of mounting the electronic component can be prevented with high precision. An electronic circuit substrate 100 includes a printed wiring board 10 and an electronic component 20. The printed wiring board 10 has a first land 11 and a second land 12. The electronic component 20 has a first bond portion 24 which is bonded to the first land 11 with solder, and a second bond portion 25 which is bonded to the second land 12 with solder. The bond area of the first land 11 and the first bond portion 24 is larger than the bond area of the second land 12 and the second bond portion 25. In one direction D1, the position of an outer side edge 24b of the first bond portion 24 is set so as to match the position of the outer side edge 11b of the first land 11.

A ceramic electronic component of the present disclosure includes a component body including a ceramic layer, at least one terminal electrode provided on one main surface of the component body, and an insulating covering layer provided across the ceramic layer and the terminal electrode to cover part, instead of an entire circumference, of a peripheral edge portion of the terminal electrode, wherein when viewed in plan view from one main surface of the component body, the covering layer intersects with the terminal electrode at a non-perpendicular angle at an intersection of the covering layer and the terminal electrode not covered with the covering layer.

A printed wiring board includes a resin insulating layer, a conductor layer formed on a surface of the resin insulating layer, an outermost insulating layer formed on the resin insulating layer such that the outermost insulating layer is covering the conductor layer and has an opening extending to the conductor layer, and a metal post formed in the opening of the outermost insulating layer such that the metal post is protruding from the outermost insulating layer.

An electronic device includes a flexible circuit structure. The flexible circuit structure includes a flexible substrate and an insulator. The flexible substrate has a surface on which a plurality of pads are disposed. The insulator is disposed on the flexible substrate and is disposed between two adjacent pads of the plurality of pads.

A printed circuit board includes a first chip component, a second chip component, and a printed wiring board. The first chip component and the second chip component each has a length L2 in the longitudinal direction. A relationship of 0.894≤L2/L1≤1.120 is satisfied, where L1 represents a length of the first opening in the longitudinal direction. A relationship of 0.894≤L2/L4≤1.120 is satisfied, where length L4 represents a length of the second opening in the longitudinal direction. A relationship of 0.183≤L.sub.OA/L.sub.iA≤0.309 is satisfied, where L.sub.iA represents a length of the first land in the longitudinal direction, and L.sub.OA represents a thickness of solder on an end surface of the first electrode. A relationship of 0.183≤L.sub.OB/L.sub.iB≤0.309 is satisfied, where L.sub.iB represents a length of the second land in the longitudinal direction, and L.sub.OB represents a thickness of solder on an end surface of the second electrode.

A module includes a ceramic multilayer substrate including a main surface; a surface-layer conductor pattern arranged on the main surface and integrally formed to include a land portion and an interconnection portion extending from the land portion; a first layer arranged to cover the land portion while exposing at least a part of the interconnection portion, the first layer having conductivity, the first layer being composed of a material that is lower in affinity to solder than a material for the surface-layer conductor pattern, and a component mounted on the first layer with solder being interposed. The solder is not in direct contact with the surface-layer conductor pattern.

A printed circuit board includes an insulating layer, a circuit pattern on the insulating layer, and a surface treatment layer on the circuit pattern. The surface treatment layer includes a bottom surface having a width wider than a width of a top surface of the circuit pattern.

A portable communication device is provided that includes a display including a display area and a connecting area extending from one side of the display area; a back panel disposed on a rear surface of the display, the back panel including an opening formed therein; a flexible printed circuit board (FPCB) connected with the connecting area; and a biometric sensor electrically coupled with the FPCB, with the connecting area being housed and bent within the portable communication device such that the biometric sensor is placed under the opening.