Electronic device package with connection terminals including uneven contact surfaces

An electronic device package comprising:

• an electronic device including a plurality of input/output terminals;
• a package board which receives the electronic device on a first surface and includes wiring connected to the input/output terminals of the electronic device;
• and
• a first connection terminal formed on a second surface of the package board, which is formed on an opposite side of the first surface, and connected to the wiring,
• the first connection terminal formed with an uneven contact surface to receive a solder material placed thereon,
• the uneven contact surface is formed by inclined flat surfaces which are inclined with respect to the second surface,
• the first connection terminal is disposed in an arrangement separated by a polygon contour.

A printed wiring board comprising:

• a substrate;
• and
• a plurality of conductor pads formed on a surface of the substrate;
• at least one of the conductor pads includes an uneven contact surface formed to receive a solder material placed thereon, and
• the uneven contact surface is formed by inclined flat surfaces which are inclined with respect to the second surface.

A board unit comprising:

• an electronic device including a plurality of input/output terminals;
• a package board which receives the electronic device on a first surface and includes wiring connected to the input/output terminals of the electronic device;
• a plurality of first connection terminals formed on a second surface of the package board which is formed on an opposite side of the first surface and connected to the wiring;
• a plurality of solder pieces joined to each of the first connection terminals;
• and
• a printed wiring board including wiring connected to second connection terminals formed on the printed wiring board corresponding to each of the first connection terminal and each joined to the solder pieces, wherein
• a pair of the first and the second connection terminals among the plurality of first connection terminals and the corresponding plurality of second connection terminal pairs includes uneven contact surfaces formed to receive the solder pieces placed thereon,
• the uneven contact surfaces are formed by inclined flat surfaces which are inclined with respect to the second surface.

A method of producing a printed wiring board, comprising:

• forming conductor protrusions on a film of a conductor material formed on a surface of package board material so that the conductor protrusions are disposed in positions corresponding to input/output pads;
• forming a resist film on the film so that the resist film models a conductor wiring pattern including the input/output pads while the protrusions are covered with the resist film;
• and
• removing the film of the conductor material from the periphery of the resist film while leaving the conductor wiring pattern,
• the conductor protrusions having uneven contact surfaces formed by inclined flat surfaces which are inclined with respect to the wiring board.