Ngk Spark Plug Company, Limited

Kazutaka Tanaka

Hajime Saiki

Takuya Hando

Jun Kurano

A heating device includes a holding member having a resistive heating element, a columnar support member joined to the holding member, power receiving electrodes connected to the resistive heating element, and an electrode terminal unit disposed in each of through holes in the columnar support member. Each of the electrode terminal units includes a first columnar member having one end portion connected to the power receiving electrode and the other end portion connected to a metal stranded wire, and a second columnar member having an end portion connected to the metal stranded wire. A columnar member assembly having a portion of the first columnar member and a portion of the second columnar member includes a general portion and a large-diameter portion. The distance between the large-diameter portion and an inner peripheral surface of the through hole is smaller than the distance between the general portion and the inner peripheral surface.

Heating device

A wiring board has a wiring board main body, a solder resist and solder bumps. The solder resist is formed on a top surface of the wiring board main body, and includes first openings, and second openings that have a diameter larger than that of the first openings. The solder bumps are disposed in the first openings and in the second openings. In addition, top portions of the solder bumps disposed in the first openings have a flat face, while top portions of the solder bumps disposed in the second openings have a non-flat face.

Growing community of inventors

Ogaki, Japan

Kazutaka Tanaka