Patent ID: 6054174
Filing Date: 2000-04-25
Classification: C23C,G11B,H05K

Abstract:
A method for producing an electronic apparatus casing comprising steps of:press working at least one sheet consisting of magnesium or magnesium alloy material to provide a casing body consisting of magnesium or a magnesium alloy with a roughened outer surface,forming a copper layer on said roughened outer surface by way of a non-electrolytic plating method on the casing body, said copper layer having a thickness of about 2 .mu.m;forming a nickel layer on said copper layer by way of non-electrolytic plating, said nickel layer having a thickness of about 30 .mu.m;carrying out a surface grinding and a honing to said nickel layer to achieve a surface roughness of less than or about 0.5 S;forming a transparent glass layer by applying a colloid solution containing from about 2.5% to about 5% SiO.sub.2 and from about 0.5% to about 1% Na.sub.2 O, which is applied, heated, and dried to form said transparent glass layer, the transparent glass layer having a thickness ranging from about 1 .mu.m to about 5 .mu.m; andforming a silica layer on said glass layer by applying a partially hydrolyzed solution of an organic silicate ester, the organic silicate ester having the formulaR'.sub.n Si(OR).sub.4-nwherein R is an alkyl group and R' is selected from the group consisting of methyl and phenyl and wherein the concentration of the organic silicate ester in the solution ranging from about 20 to about 40 weight %, which is then heated so as to be calcinated, the silica layer having a thickness ranging from about 1 .mu.m to about 3 .mu.m.