The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 22, 2002
Filed:
Apr. 04, 2000
Shoji Sakemi, Fukuoka, JP;
Abstract
The solder pre-coating method including cleaning by dry etching a surface of a gold film on a surface of an electrode formed on a circuit board by covering the surface of the circuit board with a template having an opening; adding tackiness on the surface of the electrode after cleaning by making a tackiness adding compound react with the electrode surface; attaching solder powder on the tackiness added electrode surface; and forming a solder pre-coat layer on the electrode surface by melting the solder powder by heating. Another solder pre-coating method of the present invention adds tackiness on a surface of a gold film on a surface of an electrode after forming a metal film containing one of copper or nickel on the surface of the gold film. According to the present invention, as it eliminates the need for masking work on each individual circuit board in pre-coating solder, a partially solder pre-coated circuit board can be obtained simply and at allow cost. Furthermore, the circuit board of the present invention can reduce, possible failure in the assembling process.