Pioneer Electronic Corporation

Wako Pure Chemical Industries, Inc.

Tetsuya Watanabe

Osamu Watanabe

Takashi Yamaguchi

Motoshige Sumino

Shigeaki Imazeki

Hiroo Adachi

Shinichi Ogura

Kazuhito Fukasawa

Tohru Kageyama

Osamu Shishido

Yoichi Nishiyama

Yuuichi Mineo

Keiichi Ogawa

A method for producing a triarylsulfonium salt having a structure that only one of the three arobatic rings of the three aromatic rings on the cationic portion is different from the other two aromatic groups, and which is useful, for example, as an acid-generating agent for a resist or a photo cationic polymerization initiator,  

Process for producing triarylsulfonium salt

A heat sink/circuit board assembly allows repairing or inspection of circuit or parts without impairing heat-radiating effect. A sub-heat sink is protruded from a lateral end of the circuit board in a direction parallel to the main surface of the circuit board and is connected to the main heat sink at its protruding portion. The diameter of the opening of the recessed portion of the main heat sink facing the circuit board is made larger than outer diameter of the circuit board. When circuit elements on the main surface of the circuit board facing the recessed portion of the main heat sink are to be repaired or inspected, the main heat sink is connected to the sub-heat sink on a main surface which is on the opposite side to the surface carrying the circuit elements, while the same heat-radiating effect as in the normal condition can be obtained.

Heat sink/circuit board assembly

Growing community of inventors

Kawagoe, Japan

Tetsuya Watanabe