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:
Jun. 16, 1998
Filed:
Dec. 06, 1995
Hitachi, Ltd., Tokyo, JP;
Abstract
A method of solder bonding suitable for a body having a large bonding surface area including the following steps of cleaning off the bonding surfaces in vacuum chamber by impinging accelerated particles such as argon ions through reverse spattering; then covering with an oxidation inhibiting thin silver film over the cleaned off bonding surfaces through spattering; further sandwiching a cleaned off solder foil between the bonding surfaces covered with the oxidation inhibiting thin sliver film; and heating the solder foil in vacuum upto the melting temperature thereof to complete the bonding, whereby defects in the solder bonding is reduced downto about 1/25 and life time of the solder bonding which is affected by thermal fatigue is prolonged twice in comparison with a conventional solder bonding method, thereby reliability of the solder bonding is greatly improved.