Hitachi Chemical Company, Ltd.

Hitachi, Ltd.

Yamada Den-on Co., Ltd.

Eisaku Namai

Shigeharu Arike

Yasushi Shimada

Toshiro Okamura

Yorio Iwasaki

Hiroharu Kamiyama

Fujio Kojima

Yasuhiko Yokoya

Mitsuo Nakamura

Syuuichi Hasuda

Syuuzou Yamada

Noboru Yamazaki

A jig for measuring the characteristics of various semiconductors has three main elements including a first circuit board to be connected to a tester for measuring the characteristics of the semiconductor, a second circuit board to be connected to the semiconductor and an intermediate board located between the first and second circuit boards. The first and second circuit boards are electrically connected together through springy pins. These pins, secured to the first circuit board, extend through the intermediate board via through holes to contact with terminals located in the second circuit board. When measuring the characteristics of various semiconductors it is possible to use the jig by replacing only the second circuit board with a board adapted to the particular semiconductor being measured without replacing the other elements of the jig.

Jig for measuring the characteristics of a semiconductor, manufacturing

A coaxial conductor interconnection wiring board characterized by having at least one inner wall metallized conductive hole for connecting a conductive shield of coaxial conductor to a ground layer, or having connection metal layers for connecting ground layers or connecting the conductive shield to a ground layer, and an inner wall metallized conductive hole for connecting a central signal conductor of coaxial conductor to other circuits, is excellent in preventing crosstalk noise and shielding effect.

Process for producing coaxial conductor interconnection wiring board

A coaxial conductor interconnection wiring board includes at least one coaxial conductor and at least one conductive hole having an inner wall covered with a metal film connected to a central signal conductor of the coaxial conductor. The conductive shield of the coaxial conductor is connected to the ground layer by connection metal layers. A conductor insulating layer surrounds the metallized conductor hole and the connection metal layers surround a part of the additional conductor insulating layer. Thus, the conductive hole, insulating layer, and connection metal layers function as a coaxial conductor.

Coaxial conductor interconnection wiring board

Growing community of inventors

Shimodate, Japan

Eisaku Namai