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:
Feb. 24, 2015
Filed:
Mar. 18, 2011
Takahiro Omori, Kanagawa-ken, JP;
Kenji Hirohata, Tokyo, JP;
Tomoko Monda, Kanagawa-ken, JP;
Katsuaki Hiraoka, Kanagawa-ken, JP;
Minoru Mukai, Tokyo, JP;
Takahiro Omori, Kanagawa-ken, JP;
Kenji Hirohata, Tokyo, JP;
Tomoko Monda, Kanagawa-ken, JP;
Katsuaki Hiraoka, Kanagawa-ken, JP;
Minoru Mukai, Tokyo, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A life predicting method for a solder joint includes a step of referring to a temperature history of a measurement object having a solder joint, a step of examining at least one physical quantity selected from the group consisting of amplitude, a cycle number, a mean temperature, and a periodic length of a temperature variation with a cycle count method from the temperature history, a step of calculating a strain range by utilizing a previously prepared response surface from the physical quantity examined with the cycle count method, and a step of calculating a strain range increasing rate from a strain range with reference to a previously obtained damage index and a strain variation history of the strain range.