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Samsung Electro-mechanics Co., Ltd.

Myong Gun Chong

Yang Je Lee

Byong Ho Lee

Dek Gin Yang

Keon Yang Park

Sung Wook Chun

Min Eui Hong

Deok Jin Yang

Jae Ok Lim

Kyu Hong An

A printed circuit board for high speed processing devices such as RAMBUS is disclosed. Adhesive means are interposed between a plurality of both-face copper clad laminates, and each of the adhesive means consists of a clad laminate and prepreg layers formed on both faces of the clad laminate. The sum total of the thicknesses of the clad laminates and the prepreg layers is smaller than that of the conventional printed circuit board. Therefore, when carrying out a pressing to attach the copper foils, the thickness deviations are decreased compared with the conventional case, and therefore, the occurrence of impedance defects can be prevented.

Printed circuit board for RAMBUS

Disclosed are a conversion coating composition for use in the surface treatment of a PCB and a conversion coating method using the same. The composition comprises 0.1-30 vol % of sulfuric acid; 0.1-15 vol % of hydrogen peroxide; 0.01-10 wt % of an organic acid; 0.1-30 wt % of a nitrogen compound; 0.01-10 wt % of an organic silicate and/or organic titanate; and 0.1-20 wt % of a film forming auxiliary, 0.1-30 wt % of an etching rate controller, 0.1-20 wt % of a reaction promoter and/or 0.1-20 g/l of a stabilizer. This composition is applied to a PCB at 10-60&deg; C. for 1-10 min. The conversion coating film is superb in adhesive strength, acid resistance, and adhesion and can be formed with ease.

Conversion coating composition based on nitrogen and silicon compounds and conversion coating method using the same

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Chungchongnam-do, South Korea

Myong Gun Chong